WO2008023466A1 - Moving vector detecting bdevice - Google Patents
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- WO2008023466A1 WO2008023466A1 PCT/JP2007/052011 JP2007052011W WO2008023466A1 WO 2008023466 A1 WO2008023466 A1 WO 2008023466A1 JP 2007052011 W JP2007052011 W JP 2007052011W WO 2008023466 A1 WO2008023466 A1 WO 2008023466A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
- H04N19/51—Motion estimation or motion compensation
- H04N19/513—Processing of motion vectors
- H04N19/521—Processing of motion vectors for estimating the reliability of the determined motion vectors or motion vector field, e.g. for smoothing the motion vector field or for correcting motion vectors
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/20—Analysis of motion
- G06T7/246—Analysis of motion using feature-based methods, e.g. the tracking of corners or segments
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/117—Filters, e.g. for pre-processing or post-processing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/136—Incoming video signal characteristics or properties
- H04N19/14—Coding unit complexity, e.g. amount of activity or edge presence estimation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
- H04N19/51—Motion estimation or motion compensation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
- H04N19/51—Motion estimation or motion compensation
- H04N19/513—Processing of motion vectors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/80—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation
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- G—PHYSICS
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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- G06T2207/10—Image acquisition modality
- G06T2207/10016—Video; Image sequence
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- G—PHYSICS
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- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20021—Dividing image into blocks, subimages or windows
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- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20068—Projection on vertical or horizontal image axis
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20172—Image enhancement details
- G06T2207/20192—Edge enhancement; Edge preservation
Definitions
- the present invention relates to a motion vector detection device that detects a motion vector between frame images related to a previous frame and a subsequent frame that are in a time series front-rear relationship.
- Patent Document 1 discloses a technique for improving this problem.
- feature points of an image having a luminance gradient are extracted, and representative point matching processing is performed using the extracted feature points as representative points, thereby enabling good detection of motion vectors.
- Patent Document 2 there is a method of detecting a motion vector by dividing an image into a plurality of blocks, detecting an edge for each block, and following the movement of the edge.
- This method can reduce misjudgment when there is no characteristic pattern with a low spatial frequency such as the sky, or when there are many feature points with a high spatial frequency such as a lattice door.
- the reliability is evaluated by weighting the number of edges per block.
- a zero crossing method or the like is used as a method for detecting the edge.
- Patent Document 1 Japanese Patent No. 3534551
- Patent Document 2 Japanese Patent No. 3164121
- Patent Document 1 can reliably set the representative point where the luminance gradient exists, the correlation calculation of the representative point is performed while shifting the pixels little by little over the entire search range in the frame image. Therefore, a considerable amount of computation is required for each representative point (feature point). Therefore, unless the number of representative points is kept below a certain level, it is difficult to quickly detect a motion vector and real-time processing becomes difficult. On the other hand, if there are too few representative points, the accuracy of motion vector detection will be reduced.
- the motion vector detection method disclosed in Patent Document 2 has the power to reduce erroneous determination by weighting the reliability of the motion vector calculated for each block by the number of edges for each block.
- the present invention has been made to solve the above-described problems, and can detect a motion vector between frame images with high accuracy and speed and calculate each block force while satisfying real-time processing. It is an object of the present invention to provide a motion vector detection device capable of evaluating the reliability of a motion vector.
- a first aspect of the motion vector detection device is a motion vector detection device that detects a motion vector between frame images related to a previous frame and a rear frame that are in a chronological order. For a frame image that is read out by repeating pixel scanning of the horizontal line in order in the vertical direction, an edge that emphasizes the vertical edge for each of the divided blocks having a certain division width in the vertical direction Emphasis means and said et Projection means for projecting data in the vertical direction for each of the blocks and generating projection data having a data array for one horizontal line in each of the blocks.
- the projecting means obtains a specifying means for specifying the position of the array element at each intersection and a data array in a predetermined range centered on the position of the array element at each intersection. For each of the extracting means for extracting from the projection data and the data array in the predetermined range extracted by the extracting means, values of array elements having the same relative position with respect to the position of the array element at each intersection are obtained.
- a calculation adding means based on the added result of addition by said adding means, and a detection means for detecting a motion vector related to the horizontal direction of the frame image, Ru.
- a second aspect of the motion vector detection device is a motion vector detection device that detects a motion vector between frame images related to a previous frame and a rear frame that are in a chronological order. For the frame image that is read out by repeating the pixel scanning of the horizontal line in order in the vertical direction, the horizontal edge is emphasized for each block divided into a plurality of blocks having a certain division width in the horizontal direction.
- An edge enhancement unit that performs projection in a horizontal direction for each of the blocks, and a projection having a data array for one vertical line in each of the blocks.
- Projection means for generating data, and projection data obtained by the projection means with respect to the previous frame;
- Extraction means for extracting a data array of a predetermined range from the projection data obtained by the projection means for the subsequent frame, and an array element of each intersection for each of the data array of the predetermined range extracted by the extraction means
- the third aspect of the motion vector detection device has a front-to-back relationship in time series.
- a motion vector detection device that detects a motion vector between frame images related to a previous frame and a subsequent frame, and is fixed in a vertical direction with respect to a frame image that is read by sequentially repeating pixel scanning of a horizontal line in the vertical direction.
- An edge emphasizing unit for emphasizing a vertical edge for each block divided into a plurality of blocks, and an image in which the edge is emphasized by the edge emphasizing unit.
- Projection means for projecting in the direction and generating projection data having a data array for one horizontal line in each of the blocks, and an array of post-frame projection data obtained by the projection means for the rear frame
- a maximum value acquisition means for obtaining a maximum value in the element, and a previous frame projection data obtained by the projection means with respect to the previous frame
- Identifying means for extracting, a data array in a predetermined range centering on the position of the array element at each intersection, an extraction means for extracting from the post-frame projection data, and a data array in the predetermined range extracted by the extraction means, respectively Then, add the values of the array elements that have the same relative position to the position of the array element at each intersection, and calculate the horizontal motion vector for each block based on the obtained addition result.
- a detecting means for detecting a horizontal motion vector of the entire frame image based on the horizontal motion vector for each block calculated by the calorie calculating means.
- the detecting means includes the maximum value of the post-frame projection data obtained by the maximum value obtaining means, the addition result obtained by the calorie calculating means, and the intersection information obtained by the specifying means. The reliability of the horizontal motion vector for each block is evaluated using at least one.
- a fourth aspect of the motion vector detection device is a motion vector detection device that detects a motion vector between frame images related to a previous frame and a subsequent frame that are in a time series front-rear relationship.
- Edge enhancement that emphasizes the horizontal edge for each block divided into multiple blocks with a constant division width in the horizontal direction for a frame image that is read out by repeating pixel scanning of the line in the vertical direction. And an image in which edges are emphasized by the edge enhancement means, and horizontally for each block.
- Projection means for generating projection data having a data array for one vertical line in each of the blocks, and an array element of the post-frame projection data obtained by the projection means for the rear frame
- a maximum value obtaining means for obtaining a maximum value in the above, a waveform obtained by graphing array element values in the order of the elements of the data array with respect to the previous frame projection data obtained by the projection means with respect to the previous frame, and an array element A means for specifying the position of an array element at each intersection where a straight line having a predetermined constant value intersects and outputting as intersection information, and a data array in a predetermined range centered on the position of the array element at each intersection
- the extraction means for extracting from the post-frame projection data, and for each of the predetermined range of data arrays extracted by the extraction means!
- the edge in the vertical direction is emphasized in a predetermined image area in the frame image, and the projection in the vertical direction is performed in the edge-enhanced image.
- Projection data having a data array for one horizontal line is generated, and a waveform in which array element values are graphed in the order of the data array elements with respect to the projection data of the previous frame, and the array element values are set to a predetermined constant value. Specify the position of the array element at each intersection where the straight line intersects.
- the projection data force of the subsequent frame is extracted from the data array in a predetermined range centered on the position of the array element at each intersection, and the extracted array of data in the predetermined range is compared with the position of the array element at each intersection.
- the values of array elements having the same relative position are added, and the motion vector in the horizontal direction of the frame image is detected based on the addition result.
- the edge in the horizontal direction is emphasized in the predetermined image region in the frame image, and the image in the edge direction is enhanced in the horizontal direction.
- Projection data having a data array for one vertical line is generated by projecting to the waveform, and the waveform of the array elements is graphed in the order of the data array elements with respect to the projection data of the previous frame, and the values of the array elements are predetermined.
- the position of the array element at each intersection where a straight line with a constant value intersects is specified.
- the projection data force of the subsequent frame is extracted from the data array in a predetermined range centered on the position of the array element at each intersection, and the extracted array of data in the predetermined range is compared with the position of the array element at each intersection.
- the values of array elements having the same relative position are added, and a motion vector in the vertical direction of the frame image is detected based on the addition result. As a result, motion vectors between frame images can be detected accurately and quickly.
- the detection means in the detection means, the maximum value of the post-frame projection data obtained by the maximum value acquisition means, the calorie calculation result obtained by the addition means.
- the reliability of the horizontal motion vector for each block is evaluated using at least one of the intersection information obtained by the specifying means, the horizontal motion vector obtained from the low-reliability block power is obtained. As a result, it is possible to calculate the horizontal motion vector of the entire frame image with high reliability.
- the detection means in the detection means, the maximum value of the post-frame projection data obtained by the maximum value acquisition means, the calorie calculation result obtained by the addition means Since the reliability of the vertical motion vector for each block is evaluated using at least one of the intersection information obtained by the specifying means, the vertical motion vector obtained from the low-reliability block force is used. By excluding, as a result, the vertical motion vector of the entire frame image with high reliability can be calculated.
- FIG. 10 is a block diagram showing a main configuration of a motion vector detection device 1C according to a state 4.
- FIG. 2 is a diagram for explaining a pixel scanning direction in a frame image.
- FIG. 3 is a block diagram showing a main configuration of a horizontal motion vector detection unit 2.
- FIG. 4 is a block diagram showing a main configuration of a vertical block projection unit 23.
- FIG. 5 is a block diagram showing the main configuration of a vertical block horizontal motion vector calculation unit 31.
- FIG. 6 is a block diagram showing a main configuration of a vertical motion vector detection unit 4.
- FIG. 7 is a block diagram showing a main configuration of a horizontal block projection unit 43.
- FIG. 8 is a block diagram showing a main configuration of a horizontal block vertical motion vector calculation unit 50.
- FIG. 9 is a diagram for explaining the operation of the vertical image dividing unit 21 and the vertical block projecting unit 23.
- FIG. 10 is a diagram for explaining n-value key processing in the n-value converters 314 and 504.
- FIG. 11 is a diagram for explaining the operations of a first threshold intersection searching unit 29, a vertical block projection data reading unit 30, and a vertical block horizontal motion vector calculating unit 31.
- FIG. 12 is a diagram for explaining the operation of adder 315 and peak detector 317.
- FIG. 13 is a diagram for explaining operations of a horizontal image dividing unit 41 and a horizontal block projecting unit 43.
- FIG. 14 is a diagram for explaining the operation of a third threshold intersection searching unit 48, a horizontal block projection data reading unit 49, and a horizontal block vertical motion vector calculating unit 50.
- FIG. 15 is a diagram for explaining operations of an adder 505 and a peak detection unit 507.
- FIG. 16 is a block diagram showing a main configuration of a horizontal direction motion vector detection unit 2A in a motion vector detection device 1A according to Embodiment 2 of the present invention.
- FIG. 17 is a block diagram showing a main configuration of a vertical direction motion vector detection unit 4A in the motion vector detection device 1A.
- FIG. 18 shows horizontal motion in the motion vector detection device 1C according to the third embodiment of the present invention.
- FIG. 5 is a block diagram showing a main configuration of a vector detection unit 2B.
- FIG. 19 is a block diagram showing a main configuration of a vertical block horizontal motion vector calculation unit 310.
- FIG. 20 is a block diagram showing a main configuration of a vertical motion vector detection unit 4B.
- FIG. 21 is a block diagram showing a main configuration of a horizontal block vertical motion vector calculation unit 500.
- FIG. 22 is a diagram for explaining a method for determining the effectiveness Z invalidity of each vertical block using the first vertical block projection data maximum value.
- FIG. 23 is a diagram schematically showing determination of valid Z invalidity of a vertical block.
- FIG. 24 is a diagram for explaining a method of determining the effective Z invalidity of each vertical block using the vertical block n-valued addition data peak value.
- FIG. 25 is a diagram schematically showing determination of valid Z invalidity of a vertical block.
- FIG. 26 is a diagram for explaining a method for determining valid Z invalidity of each vertical block using the number of first threshold intersections.
- FIG. 27 is a diagram schematically showing determination of valid Z invalidity of a vertical block.
- FIG. 28 is a diagram schematically showing a determination of valid Z invalidity of a vertical block.
- FIG. 29 is a diagram for explaining an example of a method for determining the horizontal motion vector of the entire image.
- FIG. 30 is a diagram for explaining an example of a method for determining the horizontal motion vector of the entire image.
- FIG. 31 is a diagram for explaining a method of determining validity Z invalidity of each horizontal block using the first horizontal block projection data maximum value.
- FIG. 32 is a diagram schematically showing determination of valid Z invalidity of a horizontal block.
- FIG. 33 is a diagram for explaining a method of determining validity Z invalidity of each horizontal block using the horizontal block n-valued addition data peak value.
- FIG. 34 is a diagram schematically showing valid Z invalid / invalid determination of a horizontal block.
- FIG. 35 is a diagram for explaining a method for determining valid Z invalidity of each horizontal block using the number of third threshold intersections.
- FIG. 36 is a diagram schematically showing valid Z invalid / invalid determination of a horizontal block.
- FIG. 37 is a diagram schematically showing determination of valid Z invalidity of horizontal blocks.
- FIG. 38 is a diagram for explaining an example of a method for determining the vertical motion vector of the entire image.
- FIG. 39 is a diagram illustrating an example of a method for determining a vertical motion vector of an entire image.
- FIG. 40 is a block diagram showing a main configuration of a horizontal direction motion vector detection unit 2C in the motion vector detection device 1C according to Embodiment 4 of the present invention.
- FIG. 41 is a block diagram showing a main configuration of a vertical direction motion vector detection unit 4C in the motion vector detection device 1C.
- FIG. 1 is a block diagram showing a main configuration of motion vector detection apparatus 1 according to Embodiment 1 of the present invention.
- the motion vector detection device 1 detects, for example, an image motion vector representing a motion of a subject in a screen in a moving image, and a frame image related to a previous frame and a subsequent frame that are in a chronological order. A motion vector in between is detected.
- the motion vector detected by the motion vector detection device 1 is used for camera shake correction of the video camera. It is assumed that the frame image input to the motion vector detection device 1 is read out by performing horizontal pixel scanning and vertical line scanning as shown in FIG.
- the motion vector detection device 1 includes an input terminal 11, a horizontal direction motion vector detection unit 2 and a vertical direction motion vector detection unit 4, and two output terminals 12 and 13.
- the functions may be realized by software, for example, by a microprocessor, or most of the functions are realized by hardware (partially software). You may do it. Of course, all the functions can be realized with no software! Needless to say! /.
- image data (moving image) acquired by an image sensor in a video camera or image data (moving image) such as a video signal is input to the input terminal 11.
- image data moving image
- image data moving image
- a horizontal motion vector is detected by the horizontal motion vector detection unit 2, and the detected horizontal motion vector is output from the output terminal 12.
- the vertical motion vector detection unit 4 detects a vertical motion vector for the image data input to the input terminal 11.
- the vertical motion vector detected by the vertical motion vector detection unit 4 is output from the output terminal 13.
- FIG. 3 is a block diagram showing the main configuration of the horizontal motion vector detection unit 2.
- the horizontal direction motion vector detection unit 2 includes an input terminal 20, a vertical image segmentation unit 21, a vertical direction edge extraction filtering unit 22, a vertical block projection unit 23, and a first vertical block projection data maximum value.
- a storage unit 24, a bit number reduction unit 25, and a first vertical block projection line memory 26 are provided.
- the horizontal motion vector detection unit 2 includes a second vertical block projection line memory 27, a second vertical block projection data maximum value storage unit 28, a first threshold intersection search unit 29, and a vertical direction.
- a block projection data reading unit 30, a vertical block horizontal motion vector calculation unit 31, a horizontal motion vector determination unit 32, and an output terminal 33 are provided. The function of each part of the horizontal direction motion vector detection unit 2 will be briefly described (specific operations will be described in detail later).
- the vertical image dividing unit 21 divides the frame image input to the input terminal 20 in the vertical direction, and outputs a block divided in the vertical direction (hereinafter also referred to as âvertical blockâ).
- the vertical edge extraction filtering unit 22 performs a filtering process for performing edge extraction for each block divided by the vertical image dividing unit 21.
- the vertical image dividing unit 21 and the vertical edge extraction filtering unit 22 may be collectively referred to as edge enhancement means.
- the vertical block projection unit 23 projects the vertical direction of the edge-enhanced vertical block output from the vertical edge extraction filtering unit 22 in the vertical direction. Output projection data for each block.
- the first vertical block projection data maximum value storage unit 24 stores the maximum value in the projection data of the vertical block of the current frame output from the vertical block projection unit 23 (hereinafter referred to as "vertical direction of the current frame"). âBlock projection data maximum valueâ or âfirst vertical block projection data maximum valueâ) is saved. The first vertical block projection data maximum value storage unit 24 calculates a second threshold value to be described later based on the first vertical block projection data maximum value.
- the bit number reduction unit 25 is output from the vertical block projection unit 23 based on the first vertical block projection data maximum value stored in the first vertical block projection data maximum value storage unit 24. Reduce the number of bits of vertical block projection data.
- the projection data of the vertical block with the reduced number of bits is called âfirst vertical block projection dataâ.
- the first vertical block projection line memory 26 stores the first vertical block projection data whose number of bits has been reduced by the bit number reduction unit 25.
- the second vertical block projection line memory 27 uses the vertical block projection data sent from the first vertical block projection line memory 26 as the projection data (hereinafter referred to as "first block data") of the vertical block of the previous frame. 2) (vertical block projection data).
- the second vertical block projection data maximum value storage unit 28 stores the first vertical block projection data maximum value output from the first vertical block projection data maximum value storage unit 24 in the previous frame.
- second vertical block projection data maximum value also referred to as âvertical block projection data maximum value of previous frameâ. Further, the second vertical block projection data maximum value storage unit 28 calculates a first threshold value to be described later based on the second vertical block projection data maximum value.
- the first threshold intersection search unit 29 generates a waveform of the second vertical block projection data relating to the previous frame stored in the second vertical block projection line memory 27, and the second vertical block. A point where the first threshold value calculated by the projection data maximum value storage unit 28 intersects is obtained, and information on this intersection (hereinafter also referred to as âfirst threshold value intersectionâ) is output.
- the vertical block projection data reading unit 30 is centered on the first threshold intersection obtained by the first threshold intersection searching unit 29, and is within a predetermined range (motion vector detection range) before and after the first threshold intersection. Read the 1 vertical block projection data from the first vertical block projection line memory 26.
- the vertical block horizontal motion vector calculation unit 31 uses the second threshold value output from the first vertical block projection data maximum value storage unit 24, and the vertical block projection data read unit 30 Each of the read first vertical block projection data is reduced to the n value n (where n is an integer of 2 or more) to reduce the number of bits, and the n-valued projection data is converted to the first threshold intersection force. Add for each distance.
- the horizontal motion vector determination unit 32 determines a horizontal motion vector of the image based on the output from the vertical block horizontal motion vector calculation unit 31.
- the horizontal motion vector of the image determined here is output from the output terminal 33.
- FIG. 4 is a block diagram showing a main configuration of the vertical block projection unit 23.
- the vertical block projection unit 23 includes an input terminal 231, an adder 232 that performs data addition for each horizontal line, and a vertical projection temporary storage memory 233 as a buffer memory that sequentially stores the data added by the adder 232. And an output terminal 234.
- the image in which the vertical edge is emphasized by the vertical edge extraction filtering unit 22 is input for each vertical block.
- the image input to the input terminal 231 is projected in the vertical direction by the adder 232 and the vertical projection temporary storage memory 233 for each vertical block.
- the adder 232 adds the data for one horizontal line of the vertical block and the data for one horizontal line read from the vertical projection temporary memory 233, and the addition result is the vertical projection temporary.
- the data is returned to the storage memory 233 and stored.
- FIG. 5 is a block diagram showing a main configuration of the vertical block horizontal motion vector calculation unit 31.
- the vertical block horizontal motion vector calculation unit 31 includes three input terminals 311 to 313. , An n-value converter 314, an adder 315 for adding the first vertical block projection data n-valued by the n-value generator 314, and a buffer memory for sequentially storing the data added by the adder 315
- a horizontal motion vector addition memory 316 as a memory, a peak detector 317, and an output terminal 318 are provided.
- the first vertical block projection data output from the vertical block projection data reading unit 30 is input to the input terminal 311.
- the first vertical block projection data maximum value is input to the input terminal 312.
- the second threshold value output from the storage unit 24 is input.
- the input terminal 313 receives information about the first threshold value intersection output from the first threshold value intersection search unit 29.
- the n-value converter 314 converts the first vertical block projection data input from the input terminal 311 into an n-value key (for example, a ternary value) based on the second threshold value input from the input terminal 312. )
- the adder 315 converts the first vertical block projection data n-valued by the n-value generator 314 and the data read from the horizontal motion vector addition memory 316 into a first threshold intersection. The result of the addition is stored in the horizontal motion vector addition memory 316 again. When the addition for all the first threshold intersections related to the vertical block is completed by repeating such addition operation, the addition data related to the vertical block is output to the peak detector 317.
- the peak detector 317 detects a peak position (horizontal motion vector described later) in the addition data output from the adder 315.
- the peak position detected by the peak detector 317 is input to the horizontal direction motion vector determination unit 32 via the output terminal 318.
- FIG. 6 is a block diagram showing the main configuration of the vertical motion vector detection unit 4.
- the vertical motion vector detection unit 4 includes an input terminal 40, a horizontal image segmentation unit 41, a horizontal edge extraction filtering unit 42, a horizontal block projection unit 43, and a first horizontal block projection line memory 44. And a first horizontal block projection data maximum value storage unit 45.
- the vertical motion vector detection unit 4 includes a second horizontal block projection line memory 46, a second horizontal block projection data maximum value storage unit 47, and a third
- the threshold intersection searching unit 48, the horizontal block projection data reading unit 49, the horizontal block vertical motion vector calculating unit 50, the vertical motion vector determining unit 51, and the output terminal 52 are provided. The function of each part of the vertical motion vector detection unit 4 will be briefly described (specific operations will be described in detail later).
- the horizontal image dividing unit 41 divides the frame image input to the input terminal 40 in the horizontal direction and outputs a block divided in the horizontal direction (hereinafter also referred to as âhorizontal blockâ).
- the horizontal edge extraction filtering unit 42 performs a filtering process for performing edge extraction for each block divided by the horizontal image dividing unit 41.
- the horizontal image segmentation unit 41 and the horizontal direction edge extraction filtering unit 42 may be collectively referred to as edge enhancement means.
- the horizontal block projection unit 43 projects the edge-enhanced horizontal block output from the horizontal edge extraction filtering unit 42 in the horizontal direction and outputs projection data for each horizontal block.
- the first horizontal block projection line memory 44 converts the horizontal block projection data output from the horizontal block projection unit 43 into the horizontal block projection data of the current frame (hereinafter referred to as âfirst block projection dataâ). This is also referred to as âhorizontal block projection dataâ.
- the first horizontal block projection data maximum value storage unit 45 stores the maximum value of the projection data of the horizontal block of the current frame output from the horizontal block projection unit 43 (hereinafter, âhorizontal direction of the current frameâ). âBlock projection data maximum valueâ or âfirst horizontal block projection data maximum valueâ) is saved.
- the second horizontal block projection line memory 46 uses the horizontal block projection data sent from the first horizontal block projection line memory 44 as the projection data (hereinafter referred to as "first block data") of the horizontal block of the previous frame. This is also called â2 horizontal block projection dataâ.
- the second horizontal block projection data maximum value storage unit 47 stores the first horizontal block projection data maximum value output from the first horizontal block projection data maximum value storage unit 45 in the previous frame. "Second horizontal block projection data maximum"("Previous frame This is also referred to as âhorizontal block projection data maximum valueâ). Further, the second horizontal block projection data maximum value storage unit 47 calculates a third threshold value and a fourth threshold value, which will be described later, based on the second horizontal block projection data maximum value.
- the third threshold value intersection search unit 48 stores the second horizontal block projection data and the second horizontal block projection data related to the previous frame stored in the second horizontal block projection line memory 46. A point where the third threshold value calculated by the maximum value storage unit 47 intersects is obtained, and information on this intersection (hereinafter also referred to as âthird threshold value intersectionâ) is output.
- the horizontal block projection data reading unit 49 is centered on the third threshold intersection obtained by the third threshold intersection searching unit 48, and is within a predetermined range (motion vector detection range) before and after the third threshold intersection. 1 horizontal block projection data is read from the first horizontal block projection line memory 44.
- the horizontal block vertical motion vector calculation unit 50 uses the fourth threshold value output from the second horizontal block projection data maximum value storage unit 47, and the horizontal block projection data read unit 49 Each of the first horizontal block projection data that has been read out is reduced to n-values (n is an integer of 2 or more) to reduce the number of bits, and the n-valued projection data is converted to the third threshold intersection force. Add for each distance.
- the vertical direction motion vector determination unit 51 determines the vertical direction motion vector of the image based on the output from the horizontal block vertical direction motion vector calculation unit 50.
- the vertical motion vector of the image determined here is output from the output terminal 52.
- FIG. 7 is a block diagram showing the main configuration of the horizontal block projection unit 43.
- the horizontal block projection unit 43 includes an input terminal 431, an adder 432 that adds one horizontal line data of the horizontal block, and a horizontal projection temporarily as a buffer memory that sequentially stores the data added by the adder 432.
- a storage memory 433 and an output terminal 434 are provided.
- an image in which horizontal edges are emphasized by the horizontal edge extraction filtering unit 42 is input.
- the image input to the input terminal 431 is projected in the horizontal direction by the adder 432 and the horizontal projection temporary storage memory 433 for each horizontal block. Specifically, for one horizontal line of pixels in a horizontal block, The pixel input from the input terminal 431 and the addition result up to the previous pixel by the adder 432 and stored in the horizontal projection temporary storage memory 433 are added by the adder 432, and the addition result is again projected in the horizontal direction. Return to temporary storage memory 433 for storage.
- the addition data of all the pixels of one horizontal line of the horizontal block is output from the output terminal 434. Will be. Thereafter, similarly, the projection data in the horizontal direction of the next horizontal block is processed, and when processing of all the horizontal blocks for one horizontal line is completed, the processing of the next horizontal line is performed.
- FIG. 8 is a block diagram showing a main configuration of the horizontal block vertical motion vector calculation unit 50.
- the horizontal block vertical motion vector calculation unit 50 includes three input terminals 501 to 503, an n-value converter 504, and a first horizontal block projection n-valued by the n-value converter 504.
- An adder 505 for adding data a vertical motion vector addition memory 506 as a buffer memory for sequentially storing the data added by the adder 505, a peak detector 507, and an output terminal 5 08 â
- the adder 505 for adding data a vertical motion vector addition memory 506 as a buffer memory for sequentially storing the data added by the adder 505, a peak detector 507, and an output terminal 5 08 â The
- the first horizontal block projection data output from the horizontal block projection data reading unit 49 is input to the input terminal 501, and the second horizontal block projection data maximum value is input to the input terminal 502.
- the fourth threshold value output from the storage unit 47 is input.
- information on the third threshold value intersection output from the third threshold value intersection search unit 48 is input to the input terminal 503.
- the n-value quantizer 504 converts the first horizontal block projection data input from the input terminal 501 into an n-value key (for example, a ternary value) based on the fourth threshold value input from the input terminal 502. )
- the adder 505 converts the first horizontal block projection data n-valued by the n-valued converter 504 and the data read from the vertical motion vector addition memory 506 into a third threshold intersection. The result of addition is stored in the vertical motion vector addition memory 506 again.
- the addition data related to the horizontal block is output to the peak detector 507.
- the peak detector 507 detects a peak position (vertical motion vector described later) in the addition data output from the adder 505.
- the peak position detected by the peak detector 507 is input to the vertical direction motion vector determination unit 51 via the output terminal 508.
- the vertical image dividing unit 21 performs block division in the vertical direction. In other words, the vertical image dividing unit 21 sets a plurality of image regions (vertical blocks) obtained by dividing the frame image in the vertical direction. As a result, in the subsequent processing, processing and management are performed for each vertical block.
- the image data power of 640 pixels x 480 pixels is 7 vertical directions having a width (division width) of 64 pixels in the vertical direction. Divided into blocks Vb0 to vb6. Note that the bottom vertical image data vb7 is not used in the detection of horizontal motion vectors. Seven vertical blocks vb0 to vb6 occupying most of the force frame images are used for detection of horizontal motion vectors. For this reason, there is no particular problem in terms of detection accuracy.
- the division width and the number of divisions shown in (a) of Fig. 9 are not essential.
- the image divided into seven vertical blocks vb0 to vb6 by the vertical image dividing unit 21 as shown in Fig. 9A is an edge component extending in the vertical direction in the vertical edge extraction filtering unit 22.
- a filtering process is performed to emphasize the image portion that changes sharply in the horizontal direction.
- Filters used in this filtering process include the (1, 1) 2-tap filter, which simply takes the difference between pixels adjacent in the horizontal direction, and the equivalent of the second derivative (â1, 2, â 1). ) 3-tap filter can be used.
- It is essential to use such a filter as long as the output value rises in the image area where the luminance change in the horizontal direction increases.
- the image data in which the vertical edge is emphasized for each vertical block (image region) vbO to vb 6 by the vertical edge extraction filtering unit 22 is input to the vertical block projection unit 23, and the vertical block Projection unit 23 projects in the vertical direction.
- This projection reduces the noise component in the vertical direction (between the lines) and enhances the edge component in the vertical direction, so that the vertical edge corresponding to the feature point is highlighted to improve motion vector detection accuracy. It will be possible to plan.
- the operation of the vertical block projection unit 23 will be described with reference to the conceptual diagram shown in FIG. 9 (b).
- the vertical block projection unit 23 when the input of the vertical blocks vb0 to vb6 shown in (a) of Fig. 9 is completed, that is, the final lines in the vertical blocks vb0 to vb6 with edge enhancement.
- the data array Mv has an effective element of the total number of pixels of the horizontal line 1 (for a 2-tap filter such as force (1, 1) that has the total number of pixels of the horizontal line (for example, 640).
- a 3-tap filter such as 639) and (1, 1, 2, 1)
- the effective element is the total number of pixels in the horizontal line minus 2 (eg, 638).
- the image data of the vertical blocks vb0 to vb6 (image data subjected to edge enhancement in the vertical direction) input via the input terminal 231 sequentially Input to adder 232.
- the adder 232 the first horizontal line force of the input vertical block is written into the vertical projection temporary storage memory 233 without reading the data in the vertical projection temporary storage memory 233.
- the adder 232 reads the addition result up to the previous line stored in the vertical projection temporary storage memory 233, and adds it to the horizontal line of the vertical block input from the input terminal 231. Then, the addition result is written back to the vertical projection temporary storage memory 233.
- the projection data obtained by adding all horizontal lines of the vertical block in the adder 232 is stored in the vertical projection temporary storage memory 233 and the first line of the next vertical block is input. At this time, the projection data in the vertical projection temporary storage memory 233 may be read out and output from the output terminal 234.
- the first vertical block projection data maximum value storage unit 24 calculates the maximum value related to the projection data of the vertical block output from the vertical block projection unit 23, and the first vertical block projection data maximum Save as a value (maximum vertical block projection data for the current frame). In other words, the first vertical block projection data maximum value storage unit 24 finds the maximum value in the array element of the data array Mv (FIG. 9 (b)) relating to the projection data of the current frame (following frame). This maximum value is stored.
- the first vertical block projection data maximum value storage unit 24 calculates the second threshold value based on the calculated vertical block projection data maximum value of the current frame. For example, if the maximum vertical block projection data value of the current frame is Plmax, the second threshold value â 2 is calculated by the following equation (1).
- kl is a predetermined coefficient, and 0 and kl â 1.
- the calculation of the second threshold value a 2 is not limited to the above equation (1). If the maximum vertical block projection data value Plmax of the current frame increases, the second threshold value oc 2 increases. If it is a thing, you can use the conversion table again!
- the bit number reduction unit 25 the vertical block projection data maximum value of the current frame input from the first vertical block projection data maximum value storage unit 24 (first vertical block projection data maximum value) Based on the above, the effective bit range of the projection data is determined. Then, the upper invalid bit and the lower invalid bit set based on this valid bit range are reduced from the vertical block projection data input from the vertical block projection unit 23, and the vertical of the current frame consisting only of valid bits is reduced.
- the first vertical block projection line memory 26 uses the vertical block projection data of the current frame whose number of bits has been reduced by the bit number reduction unit 25 as the first vertical block projection data for each vertical block. Save to. That is, the first vertical block projection line memory 26 has a bit number reduction unit based on the first vertical block projection data maximum value obtained by the first vertical block projection data maximum value storage unit 24. In 25, the projection data of the current frame (following frame) in which the number of bits (data length of each array element) is reduced is stored.
- the first vertical block projection line memory 26 reads the vertical block projection data of the previous frame at the timing when new first vertical block projection data relating to the current frame is input, and the second vertical block projection line memory 26 The vertical block projection line memory 27 is given.
- the second vertical block projection line memory 27 uses the vertical block projection data of the previous frame read out from the first vertical block projection line memory 26 as the second vertical block projection data. save.
- the first vertical block projection data maximum value storage unit 24 is already stored at the timing when the new first vertical block projection data maximum value for the current frame is updated.
- the first vertical block projection data maximum value is read out and provided to the second vertical block projection data maximum value storage unit 28.
- the first vertical block projection data maximum value read from the first vertical block projection data maximum value storage unit 24 is the previous frame. Stored as the second vertical block projection data maximum value (vertical block projection data maximum value of the previous frame).
- the vertical block projection data maximum value of the current frame stored in the first vertical block projection data maximum value storage unit 24 is the second vertical block projection data of the next frame.
- the maximum value storage unit 28 stores the vertical block projection data of the previous frame as the maximum value.
- the second vertical block projection data maximum value storage unit 28 sets a first threshold (predetermined constant value) based on the second vertical block projection data maximum value for the previous frame. It is. For example, if the maximum value of the vertical block projection data of the previous frame is P2max, the first threshold â â is calculated by the following equation (2).
- k2 is a predetermined coefficient, and 0 â k2 â 1.
- the calculation of the first threshold value a1 is not limited to the above equation (2). If the maximum value P2max in the vertical block projection data of the previous frame increases, the first threshold value oc1 increases. If it is a thing, you can use the conversion table again!
- the first threshold intersection search unit 29 the second vertical block projection data read from the second vertical block projection line memory 27 and the second vertical block projection data maximum value The intersection with the first threshold output from the storage unit 28 (first threshold intersection) is searched for in the horizontal direction.
- the information on the first threshold intersection obtained by the first threshold intersection searching unit 29 is output to the vertical block projection data reading unit 30 and the vertical block horizontal motion vector calculating unit 31.
- the vertical direction block projection data reading unit 30 (the first frame of the current frame corresponding to the motion threshold detection range centered on the first threshold intersection output from the first threshold intersection searching unit 29 is used. Read vertical block projection data from the first vertical block projection line memory 26.
- the range is from (âV) to (+ V) (where V is a positive integer) centered on the first threshold intersection
- the projection data read from the first vertical block projection line memory 26 is In the horizontal direction
- the (A (i) -V) force is also partial data of the first vertical block projection data in the range up to (A (i) + V).
- the first vertical block projection data read from the first vertical block projection line memory 26 by the vertical block projection data reading unit 30 is sent to the vertical block horizontal motion vector calculation unit 31. Is output.
- the first vertical block projection data output from the vertical block projection data reading unit 30 is converted into n-values via the input terminal 31 1 of the vertical block horizontal motion vector calculation unit 31 shown in FIG. It is input to the device 314 (compression means).
- the n-value converter 314 outputs the first vertical direction based on the second threshold value output from the first vertical block projection data maximum value storage unit 24 and input via the input terminal 312. Convert the projection data into n values.
- the n-value converter 314 calculates the data length of each array element, for example, the data array Mv (FIG. 9 (b)) regarding the projection data of the current frame extracted by the vertical block projection data reading unit 30. Compressed by ternary processing The processing of the n-value converter 314 will be described with reference to FIG.
- FIG. 10 is a diagram for explaining n-value key processing in the n-value converter 314.
- the â -quantizer 314 outputs (1) when D â (-a 2), outputs 0 when (-a 2) â D â a 2, and outputs 1 when D> «2.
- ternary key processing is performed. That is, in the ternarization process in the n-valued unit 314, the second threshold â 2 ( â 2> set based on the maximum value of the array elements of the data array Mv in the projection data of the current frame (subsequent frame).
- the value of the array element related to the projection data of the current frame extracted by the vertical block projection data readout unit 30 is less than (1 a 2), (1 a 2) or more and a 2 or less, And if it is greater than a 2, a ternary â is performed in three steps.
- the partial waveform power of the first vertical-direction block projection data of the current frame output from the vertical-direction block projection data reading unit 30 It is important what kind of positional relationship, that is, what kind of tendency the waveform is with respect to the threshold intersection, so that the bit accuracy is sufficient to identify peaks and valleys in the first vertical block projection data waveform. Is sufficient.
- n-value converter 314 motion vector detection accuracy is improved by performing an appropriate n-value conversion process on the first vertical block projection data.
- the operations of the first threshold intersection searching unit 29, the vertical block projection data reading unit 30, and the vertical block horizontal motion vector calculating unit 31 described above will be specifically described with reference to FIG. explain.
- the horizontal axes of (a) and (b) in Fig. 11 indicate the positions of the projection data array Mv (the array elements of (b) in Fig. 9.
- the first threshold value intersections A (1) to A (8) are indicated by circles.
- the first threshold intersection search unit 29 relates to the projection data obtained by the vertical block projection unit 23 with respect to the previous frame, and the elements of the projection data array Mv (Fig. 9 (b)).
- the position of the array element at each first threshold crossing point where the waveform W2 in which the array element value is graphed in turn and the line where the array element value is the first threshold value (predetermined constant value) a 1 intersects Determine.
- the vertical block projection data reading unit 30 performs a predetermined motion vector detection range centered on each first threshold intersection A (1) to A (8) shown in (a) of FIG.
- the vertical block projection data of the current frame is read from the first vertical block projection line memory 26.
- the vertical block projection data reading unit 30 performs a vertical block projection on a data array in a predetermined range centered on the position of the array element of the projection data (data array) at each first threshold intersection. This is extracted from the projection data of the current frame (subsequent frame) output from the unit 23 and reduced in the number of bits by the bit number reduction unit 25.
- the (A (7) -V) force is also (A (7) In the range up to + V) (waveform part in the rectangular broken line)
- the corresponding first vertical block projection data Wl is read out.
- the first vertical block projection data read by the vertical block projection data read unit 30 is the first vertical block projection data maximum value storage unit 24.
- the â value is processed by the â value unit 314 of the vertical block horizontal motion vector calculation unit 31.
- the range ( â (7) âV) force is also up to (A (7) + V) (the waveform part in the rectangular broken line) in Fig. 11 (c )
- the first vertical block projection data is processed in three values.
- the vertical block projection data of the current frame is represented by â1â, â0â, or â1â.
- the n-value converter 314 performs n-value processing as shown in (c) of FIG. 11 for all the first threshold intersections output from the first threshold intersection search unit 29. Done.
- the first threshold value intersection searching unit 29, which also outputs the first threshold value intersection output via the input terminal 313, is used as the center, and the n value generator 314 outputs the n value.
- the first vertical block projection data that has been converted to the first vertical block projection data that has been read from the horizontal motion vector addition memory 316 and has been n-valued up to the previous one is added. Then, the addition result is stored in the horizontal motion vector addition memory 316 again.
- the adder 315 adds the first vertical block projection data that has been n-valued for the last one of all the first threshold intersections detected by the first threshold intersection search unit 29. Then, when the addition process for one vertical block is completed, the addition result is output to the peak detector 317.
- peak detection section 317 reads the addition result from horizontal motion vector addition memory 316 that stores the addition results for all the first threshold intersections. You may do it.
- the peak detector 317 includes, for all the first threshold value intersections detected by the first threshold value intersection search unit 29, a motion threshold detection range centered on each first threshold value intersection (described above).
- the first vertical block projection data with n values corresponding to the range of the V A force for inputting data (hereinafter also referred to as âvertical block n-value dataâ) A peak value related to the vertical block n-value data is detected by a peak detector 317.
- the peak position of the vertical block n-value data detected by this peak detector 317 becomes the horizontal motion vector obtained by the vertical block force, and the horizontal direction motion determination unit via the output terminal 3 18 Output to 32.
- the vertical block projection data readout unit 30 also extracts the vertical block projection data (data array Mv ((b) in Fig. 9) force, and the n-value unit 314 outputs the data.
- the values of array elements having the same relative position are added to the position of the array element at each first threshold intersection. Will be.
- the peak detector 317 When the vertical block n-value data generated by the adder 315 is input to the peak detector 317, the horizontal square shown in Fig. 12 (b) is obtained as the horizontal motion vector of the vertical block. Direction peak position hv is detected. That is, the peak detector 317 detects a motion vector in the horizontal direction of the frame image based on the addition result added by the adder 315.
- the peak detector 317 searches for the maximum peak position in the motion vector detection range (range of V), but if there are multiple identical maximum values, Priority is given to those close to 0 (in negative positions when the distance to origin 0 is the same). It should be noted that not only such a peak position detection rule, but the maximum value at the positive position may be prioritized, and the motion vector tendency in the previous frame is used for detection of the peak position in the current frame. May be.
- the horizontal motion vectors calculated for each vertical block by the peak detector 317 are sequentially input to the horizontal motion vector determination unit 32 via the output terminal 318.
- the horizontal direction motion vector of the entire image is determined based on the horizontal direction motion vector of each vertical block sequentially output from the vertical direction block horizontal direction motion vector calculation unit 31.
- the In the horizontal direction motion vector determination unit 32 for example, the horizontal direction motion vector having the highest appearance frequency is determined as the horizontal direction motion vector of the entire image.
- the horizontal direction motion vector determination unit 32 determines the horizontal direction motion vector for the entire frame image based on the horizontal direction motion vector of each vertical block. Even if there is, there will be no false reaction to the movement.
- the frame image power is read by sequentially repeating the pixel scanning of the horizontal line in the vertical direction.
- the direction image dividing unit 41 divides the block horizontally. That is, the horizontal image dividing unit 41 sets a plurality of image regions (horizontal blocks) obtained by dividing the frame image in the horizontal direction. As a result, in the subsequent processing, processing and management are performed for each horizontal block.
- the image data force of 640 pixels x 480 pixels is 10 horizontal directions having a width (division width) of 64 pixels in the horizontal direction. Bro Divided into hb0 to hb9. Note that the division width and the number of divisions shown in (a) of FIG. 13 are not essential.
- the image divided into 10 horizontal blocks hbO to hb9 by the horizontal image dividing unit 41 as shown in FIG. 13 (a) is the edge component extending in the horizontal direction in the horizontal edge extraction filtering unit 42.
- Filters used in this filtering process include a (1, 1) 2-tap filter that simply takes the difference between adjacent pixels in the vertical direction, and (â1, 2, â 1) equivalent to the second derivative.
- a 3-tap filter can be used. It is essential to use such a filter, as long as the output value rises in the image area where the luminance change is large in the vertical direction.
- the image data in which the horizontal edge is emphasized for each horizontal block (image region) hbO to hb 9 in the horizontal edge extraction filtering unit 42 is input to the horizontal block projection unit 43, and the horizontal block Projection unit 43 projects in the horizontal direction.
- This projection can reduce the noise component in the horizontal direction (between lines) and enhance the edge component in the horizontal direction, so that the horizontal edge corresponding to the feature point is highlighted to improve the motion vector detection accuracy. It will be possible to plan.
- the operation of the horizontal block projection unit 43 will be described with reference to the conceptual diagram of FIG.
- the horizontal block projection unit 43 when the input of one horizontal line of each horizontal block hbO to hb9 shown in (a) of Fig. 13 is completed, the horizontal block projection unit 43 has a data array Mh for one vertical line.
- Block projection data hnO to hn9 (1 array element of (b) in Fig. 13 is generated. Therefore, all array elements are arranged when the input of the final horizontal line of each horizontal block hbO to hb9 is Note that the data array Mh is an effective element in a 2-tap filter such as force (1, 1) that has array elements of the total number of pixels in the vertical line (for example, 480).
- a 3-tap filter such as 1 (for example, 479) or (1, 1, 2, 1), the effective element is the total number of pixels for the vertical line minus 2 (for example, 478).
- image data (image data subjected to horizontal edge emphasis) of each horizontal block hbO to hb9 input via the input terminal 431 force adder 432 is input.
- the adder 432 first, one horizontal label of the input horizontal block is displayed.
- the data in the horizontal projection temporary storage memory 433 is written into the horizontal projection temporary storage memory 433 without reading out the data.
- the adder 432 reads the addition result up to the previous pixel of one horizontal line stored in the horizontal projection temporary storage memory 433, and outputs one horizontal line of the horizontal block input from the input terminal 431. Is added to the current pixel, and the addition result is written back to the horizontal projection temporary storage memory 433.
- the projection data obtained by adding all the pixels of one horizontal line of the horizontal block in the adder 432 is stored in the horizontal projection temporary storage memory 433, and one horizontal line of the next horizontal block is stored.
- the projection data in the horizontal projection temporary storage memory 433 may be read out and output from the output terminal 434.
- the first horizontal block projection line memory 44 uses the horizontal block projection data of the current frame input from the horizontal block projection unit 43 as the first horizontal block projection data for each horizontal block. save.
- the first horizontal block projection data maximum value storage unit 45 calculates the maximum value for the projection data of the horizontal block input from the horizontal block projection unit 43, and the first horizontal block projection data maximum Save as a value (maximum horizontal block projection data for the current frame).
- the second horizontal block projection line memory 46 stores the horizontal block projection data read from the first horizontal block projection line memory 44 as the second horizontal block projection data for the previous frame. To do.
- the first horizontal direction Maximum block projection data maximum value storage unit 45 outputs the first horizontal block projection data maximum value from the second horizontal block projection data maximum value for the previous frame (horizontal block projection data maximum value for the previous frame). Saved as
- the horizontal block projection data maximum value of the current frame stored in the first horizontal block projection data maximum value storage unit 45 is the second horizontal block projection data in the next frame.
- the maximum value storage unit 47 stores the horizontal block projection data of the previous frame as the maximum value.
- the second horizontal block projection data maximum value storage unit 47 calculates the fourth threshold value based on the calculated horizontal block projection data maximum value of the previous frame. For example, if the maximum horizontal block projection data value for the previous frame is P4max, the fourth threshold a4 is calculated by the following equation (3).
- k4 is a predetermined coefficient, and 0 â k4 â 1.
- the calculation of the fourth threshold value â 4 is not limited to the above equation (3). If the maximum horizontal block projection data P4max of the previous frame increases, the fourth threshold value a4 increases. Any conversion table can be used. In addition, for the fourth threshold â 4, it is not necessary to use the second horizontal block projection data maximum value for each horizontal block. For example, the maximum horizontal block projection data for the entire image of the previous frame. The fourth threshold value may be calculated using the value, and the same fourth threshold value may be adopted for the entire image.
- the second horizontal block projection data maximum value storage unit 47 sets a third threshold (predetermined constant value) based on the second horizontal block projection data maximum value for the previous frame. For example, if the maximum horizontal block projection data value of the previous frame is P3max, the third threshold value a3 is calculated by the following equation (4).
- k3 is a predetermined coefficient, and 0 â k3 â 1.
- the calculation of the third threshold â 3 is not limited to the above equation (4). If the maximum horizontal block projection data value P3max of the previous frame increases, the third threshold oc 3 increases. Any conversion table can be used. For the third threshold â 3 It is not necessary to use the second horizontal block projection data maximum value for each horizontal block.For example, the third threshold value is calculated using the maximum horizontal block projection data value for the entire previous frame image. However, the same third threshold value may be adopted for the entire image.
- the third threshold intersection search unit 48 the second horizontal block projection data read from the second horizontal block projection line memory 46 and the second horizontal block projection data maximum value are obtained.
- the intersection with the third threshold (third threshold intersection) output from the storage unit 47 is searched in the vertical direction.
- Information on the third threshold intersection obtained by the third threshold intersection searching unit 48 is input to the horizontal block projection data reading unit 49 and the horizontal block vertical motion vector calculating unit 50.
- the horizontal direction block projection data reading unit 49 outputs the first frame of the current frame corresponding to the motion threshold detection range centered on the third threshold intersection output from the third threshold intersection search unit 48. Read the horizontal block projection data from the first horizontal block projection line memory 44.
- the range is ( â U) force centered on the third threshold intersection and (+ U) (where U is a positive integer)
- the projection data read from the first horizontal block projection line memory 44 is In the vertical direction
- the (B (i) -U) force is also partial data of the first horizontal block projection data in the range up to (B (i) + U).
- the first horizontal block projection data read from the first horizontal block projection line memory 44 by the horizontal block projection data reading unit 49 is sent to the horizontal block vertical motion vector calculation unit 50. Is output.
- the first horizontal block projection data output from the horizontal block projection data reading unit 49 is converted into an n-value converter via the input terminal 501 of the horizontal block vertical motion vector calculation unit 50 shown in FIG. 504 (compression means).
- the n-value converter 504 outputs the first horizontal direction based on the fourth threshold value output from the second horizontal block projection data maximum value storage unit 47 and input via the input terminal 502. Convert the projection data into n values.
- the n-value converter 504 is extracted by the horizontal block projection data reading unit 49.
- the data length of each array element in the data array Mh (Fig. 13 (b)) related to the projection data of the current frame is compressed.
- This n-valuer 504 is processed in the same manner as the above-described n-valuer 314! â For example, ternary processing is executed.
- the fourth threshold â 4 ( â 4> set based on the maximum value of the array elements of the data array Mh in the projection data of the previous frame is used. For (0), if the value of the array element for the projection data of the current frame extracted by the horizontal block projection data readout unit 49 is less than (1 â 4), (- â 4) or more and â 4 or less, And if the value is larger than â 4, the ternary value is calculated in three steps. It should be noted that the â -value calculator 504 does not necessarily have the same characteristics as the â -value calculator 314, and may have different characteristics from the â -value calculator 314.
- the third threshold intersection search unit 48 uses the second horizontal block projection data maximum in the waveform of the second vertical block projection data W4 related to the previous frame as shown in Fig. 14 (a). Third threshold value intersections B (1) to B (6) that intersect with the third threshold value a3 output from the value storage unit 47 are obtained.
- the third threshold value intersection search unit 48 relates to the projection data obtained by the horizontal block projection unit 43 with respect to the previous frame, and includes elements of the projection data array Mh ((b) in Fig. 13).
- the horizontal block projection data reading unit 49 performs a predetermined motion vector detection range centered on each of the third threshold intersections B (1) to B (6) shown in (a) of Fig. 14.
- the horizontal block projection data of the current frame is read from the first horizontal block projection line memory 44.
- the horizontal block projection data reading unit 49 generates a horizontal block projection of a predetermined range of data array centered on the position of the array element of the projection data (data array) at each third threshold intersection. Extracted from the projection data of the current frame (back frame) obtained in part 43.
- the third threshold intersection B (4) as shown in Fig. 14 (b), the (B (4) -U) force (B (4) + U) around the third threshold intersection B (4) )
- the first horizontal block projection data W3 corresponding to the range up to (the waveform portion within the rectangular broken line) is read out.
- the first horizontal block projection data read out by the horizontal block projection data reading unit 49 is the second horizontal block projection data maximum value storage unit 47.
- the output fourth threshold value â 4 is used, and n-value processing is performed by the n-value unit 504 of the horizontal block vertical motion vector calculation unit 50.
- n-value processing as shown in (c) of FIG. 14 is performed for all the third threshold intersections output from the third threshold intersection search unit 48.
- the third threshold value intersection search unit 48 output power is also output via input terminal 503.
- the first horizontal block projection data converted into the first horizontal block projection data added to the previous n values read from the vertical motion vector addition memory 506 are added together. Then, the addition result is stored in the vertical motion vector addition memory 506 again.
- the first horizontal block projection data that has been n-valued for the last one of all the third threshold intersections detected by the third threshold intersection search unit 48 is added by the adder 505.
- the addition result is output to the peak detector 507.
- the peak detector 507 includes a motion threshold detection range centered on each third threshold value intersection for all the third threshold value intersections detected by the third threshold value intersection search unit 48 (described above). This is the force to which the data (hereinafter also referred to as âhorizontal block n-value â dataâ) that is the sum of the first horizontal block projection data with n-values corresponding to ( â U range) is input.
- the peak detector 507 detects a peak value related to the n-valued data.
- the peak position of the horizontal block n value â data detected by this peak detector 507 becomes the vertical motion vector obtained by the horizontal block force, and the vertical motion determination unit via the output terminal 5008 Output to 51.
- the peak detector 507 When the horizontal block n-value â data generated by the adder 505 is input to the peak detector 507, the vertical motion vector shown in Fig. 15 (b) is displayed as the vertical motion vector of the horizontal block. A direction peak position w is detected. That is, the peak detector 507 detects a motion vector in the vertical direction of the frame image based on the addition result added by the adder 505.
- this peak detector 507 is within the motion vector detection range ( â U range).
- the peak position with the maximum value is searched, but if there are multiple identical maximum values, priority is given to the one close to the origin 0 (or the negative position if the distance to the origin 0 is equal).
- the maximum value at the positive position may be prioritized, and the motion vector tendency in the previous frame is used for detection of the peak position in the current frame. May be.
- the vertical motion vector (peak value) calculated for each horizontal block by the peak detector 507 is sequentially input to the vertical motion vector determination unit 51 via the output terminal 508.
- the vertical motion vector determination unit 51 determines the vertical motion vector of the entire image based on the vertical motion vector of each horizontal block sequentially output from the horizontal block vertical motion vector calculation unit 50.
- the vertical motion vector determination unit 51 determines, for example, the vertical motion vector having the highest appearance frequency as the vertical motion vector of the entire image.
- Horizontal block vertical motion vector calculation unit 50 The average value of the vertical motion vectors of may be determined as the vertical motion vector of the entire image.
- the vertical motion vector determination unit 51 determines the vertical motion vector for the entire frame image based on the vertical motion vector of each horizontal block, motion is performed on a part of the image. Even if there is, there will be no false reaction to the movement.
- the vertical block projection data is generated by projecting in the vertical direction for each vertical block in which the vertical edge is emphasized, and the vertical frame of the previous frame is generated. Intersection of direction block projection data and first threshold â 1 The vertical frame projection data of the current frame corresponding to the movement range detection center around the point (first threshold intersection) is read and added for each distance of each first threshold intersection force. Force Since the motion vector in the horizontal direction is detected, the motion of the vertical edge of the image corresponding to the feature point can be tracked with a small amount of computation.
- horizontal block projection data is generated by projecting in the horizontal direction for each horizontal block with emphasized horizontal edges, and the horizontal block projection data and the third threshold value of the previous frame are generated.
- the bit number reduction unit 25 of the motion vector detection device 1 uses the maximum value of the vertical block projection data of the current frame calculated by the first vertical block projection data maximum value storage unit 24. Since the number of bits in the vertical block projection data of the frame is reduced, the amount of computation in the subsequent processing can be suppressed, and motion vectors can be detected more quickly.
- the motion vector detection device 1 calculates the second vertical block projection data maximum value for the previous frame and sets the first threshold value â 1 based on this maximum value, an appropriate first value is set. A threshold intersection can be set. Similarly, since the second horizontal block projection data maximum value for the previous frame is obtained and the third threshold value oc3 is set based on this maximum value, an appropriate third threshold value intersection can be set.
- the vertical image dividing unit 21 divides the frame image in the vertical direction, and then emphasizes the edge in the vertical direction for each divided image (vertical block). A divided image with emphasized vertical edges can be easily generated. Similarly, after the frame image is divided in the horizontal direction by the horizontal image dividing unit 41, the horizontal edge is emphasized for each divided image (horizontal block). It can be generated easily.
- the n-value generator 314 of the vertical block horizontal motion vector calculation unit 31 converts the projection data read by the vertical block projection data reading unit 30 into n-values. Subsequent calculations can be reduced, and motion vectors can be detected more quickly.
- the n-value converter 314 since the n-value converter 314 performs ternary processing based on the second threshold value oc 2 set based on the maximum value of the vertical block projection data of the current frame, it ensures a relatively large dynamic range. However, motion vector detection capable of real-time processing can be realized. Also, the memory can be greatly reduced.
- the n-value generator 504 of the horizontal block vertical motion vector calculation unit 50 performs n-value conversion on the projection data read by the horizontal block projection data reading unit 49, and so on.
- the amount of calculation can be reduced, and motion vectors can be detected more quickly.
- the n-value converter 504 sets an appropriate fourth threshold â 4 in order to calculate a three-value based on the fourth threshold â 4 based on the maximum value of the horizontal block projection data of the previous frame.
- motion vector detection capable of real-time processing without greatly degrading the dynamic range.
- the memory can be greatly reduced.
- the motion vector detection device 1 A according to the second embodiment of the present invention has a force similar to that of the motion vector detection device 1 according to the first embodiment.
- the vertical motion vector detection unit are different in configuration.
- the configurations of the horizontal direction motion vector detection unit 2A and the vertical direction motion vector detection unit 4A in the motion vector detection device 1A will be described with reference to FIGS.
- FIG. 16 is a block diagram showing a main configuration of the horizontal direction motion vector detection unit 2A.
- parts having the same functions as those of the horizontal motion vector detection unit 2 described in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
- the edge enhancement unit of the horizontal direction motion vector detection unit 2A the vertical direction image segmentation unit 21, the vertical direction edge extraction filtering unit 22, and the edge enhancement unit of the horizontal direction motion vector detection unit 2 of Embodiment 1
- the arrangement of is reversed.
- the extraction filtering unit 22 performs extraction processing for extracting edge components extending in the vertical direction, in other words, enhancing an image portion that changes sharply in the horizontal direction.
- the vertical image dividing unit 21 sets a plurality of image regions (vertical blocks) obtained by dividing the frame image subjected to edge enhancement in the vertical direction. As a result, in the subsequent processing, processing and management are performed for each vertical block.
- the image data divided by the vertical image dividing unit 21 is input to the vertical block projecting unit 23.
- the processing after the vertical block projecting unit 23 is the horizontal motion vector of the first embodiment. Processing similar to that of the detection unit 2 is performed.
- FIG. 17 is a block diagram showing the main configuration of the vertical motion vector detection unit 4A.
- parts having the same functions as those in the vertical direction motion vector detection unit 4 described in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
- edge enhancement unit of the vertical direction motion vector detection unit 4A the horizontal image segmentation unit 41, the horizontal direction edge extraction filtering unit 42, and the edge enhancement unit of the vertical direction motion vector detection unit 4 of Embodiment 1
- the arrangement of is reversed.
- the operation of the vertical motion vector detection unit 4A will be described.
- a horizontal edge As shown in Fig. 2, when a frame image read by repeating pixel scanning of a horizontal line in order in the vertical direction is input to the input terminal 40 of the vertical motion vector detection unit 4A, a horizontal edge
- the extraction filtering unit 42 performs extraction of edge components extending in the horizontal direction, in other words, filtering processing that emphasizes an image portion that changes sharply in the vertical direction.
- the horizontal image dividing unit 41 sets a plurality of image regions (horizontal blocks) obtained by dividing the frame image subjected to edge enhancement in the horizontal direction. Therefore, in the subsequent processing, processing and management are performed for each horizontal block.
- the image data divided by the horizontal image dividing unit 41 is input to the horizontal block projecting unit 43.
- the processing after the horizontal block projecting unit 43 is the vertical direction motion vector of the first embodiment. Processing similar to that of the detection unit 4 is performed.
- the vertical edge extraction filtering unit 22 emphasizes the edge in the vertical direction with respect to the frame image, and then the edge-enhanced frame image is vertically converted to the vertical image dividing unit 21. Since the image is divided in the direction, a divided image in which the edge in the vertical direction is emphasized can be easily generated.
- the horizontal image dividing unit 41 divides the edge-enhanced frame image in the horizontal direction. Split images with enhanced edges can be easily generated.
- the vertical direction edge extraction filtering unit 22 and the horizontal direction edge extraction filtering unit 42 are separately arranged in the horizontal direction motion vector detection unit 2A and the vertical direction motion vector detection unit 4A.
- the vertical edge extraction filtering unit 22 and the horizontal edge extraction filtering unit 42 are both provided with a horizontal Z vertical edge extraction filtering unit that integrates the functions of the vertical edge extraction filtering unit 22 and the output of the vertical image segmentation unit 21. Alternatively, it may be input to each of the horizontal image dividing unit 41.
- the motion vector detection device 1B according to the third embodiment of the present invention has a force similar to that of the motion vector detection device 1 according to the first embodiment.
- the configurations of the motion vector detection unit and the vertical direction motion vector detection unit are different.
- FIG. 18 is a block diagram showing a main configuration of the horizontal direction motion vector detection unit 2B.
- parts having the same functions as those in the horizontal motion vector detection unit 2 described in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
- the horizontal motion vector detection unit 2B includes an input terminal 20, a vertical image segmentation unit 21, a vertical edge extraction filtering unit 22, a vertical block projection unit 23, and a first vertical block projection.
- a maximum data storage unit 24, a bit number reduction unit 25, and a first vertical block projection line memory 26 are provided.
- the horizontal motion vector detection unit 2 includes a second vertical block projection line memory 27, a second vertical block projection data maximum value storage unit 28, a first threshold intersection search unit 29, and a vertical direction.
- a block projection data reading unit 30, a vertical block horizontal motion vector calculation unit 310, a horizontal motion vector determination unit 320, and an output terminal 33 are provided.
- Horizontal motion vector detection unit 2B In the horizontal motion vector detection unit 2B described above, the functional power of the vertical block horizontal motion vector calculation unit 310 and the horizontal motion vector determination unit 320 is implemented. Horizontal motion vector detection unit 2 according to Embodiment 1 This is different from the vertical block horizontal motion vector calculation unit 31 and the horizontal motion vector determination unit 32.
- the vertical block horizontal motion vector calculation unit 310 uses the second threshold value output from the first vertical block projection data maximum value storage unit 24, and uses the vertical block projection data read unit 30.
- Each of the first vertical block projection data read out in step n is converted into n values (n is an integer of 2 or more) to reduce the number of bits, and the n converted projection data from the first threshold intersection Add for each distance.
- the peak position (horizontal motion vector described later) and peak value information in the addition data are provided to the horizontal motion vector determination unit 320.
- the horizontal direction motion vector determination unit 320 determines the horizontal direction motion vector of the image based on the output from the vertical direction block horizontal direction motion vector calculation unit 31.
- the horizontal motion vector of the image determined here is output from the output terminal 33.
- Horizontal The direction motion vector determination unit 320 outputs the first vertical block projection data maximum value and the first threshold intersection search unit 29 stored in the first vertical block projection data maximum value storage unit 24. It is configured to receive information on the threshold crossing 1 and use it for processing that increases the reliability of the horizontal motion vector. The specific operation will be described later in detail.
- FIG. 19 is a block diagram showing the main configuration of the vertical block horizontal motion vector calculation unit 310.
- the vertical block horizontal motion vector calculation unit 310 includes three input terminals 311 to 313, an n-value converter 314, and a first vertical block projection that is n-valued by the n-value generator 314.
- An adder 315 for adding data, a horizontal motion vector addition memory 316 as a buffer memory for sequentially storing the data added by the adder 315, a peak detector 3170, and output terminals 318 and 319 are provided. ing.
- the first vertical block projection data output from the vertical block projection data reading unit 30 is input to the input terminal 311.
- the first vertical block projection data maximum value is input to the input terminal 312.
- the second threshold value output from the storage unit 24 is input.
- the input terminal 313 receives information about the first threshold value intersection output from the first threshold value intersection search unit 29.
- the n-value converter 314 converts the first vertical block projection data input from the input terminal 311 into an n-value key (for example, ternarization based on the second threshold value input from the input terminal 312). )
- the adder 315 converts the first vertical block projection data n-valued by the n-value generator 314 and the data read from the horizontal motion vector addition memory 316 into a first threshold intersection. The result of the addition is stored in the horizontal motion vector addition memory 316 again. When the addition for all the first threshold intersections related to the vertical block is completed by repeating such an addition operation, the addition data related to the vertical block is output to the peak detector 3170.
- the peak detector 3170 is a peak position in the addition data output from the adder 315.
- the peak position detected by the peak detector 3170 is output via the output terminal 318 to the horizontal direction motion vector determination unit 320.
- the peak value is manually input to the horizontal direction motion vector determination unit 320 via the output terminal 319.
- FIG. 20 is a block diagram showing the main configuration of the vertical motion vector detection unit 4B.
- the vertical motion vector detection unit 4B includes an input terminal 40, a horizontal image segmentation unit 41, a horizontal edge extraction filtering unit 42, a horizontal block projection unit 43, and a first horizontal block projection.
- a line memory 44 and a first horizontal block projection data maximum value storage unit 45 are provided.
- the vertical motion vector detection unit 4 includes a second horizontal block projection line memory 46, a second horizontal block projection data maximum value storage unit 47, a third threshold intersection search unit 48, A direction block projection data reading unit 49, a horizontal block vertical direction motion vector calculation unit 500, a vertical direction motion vector determination unit 510, and an output terminal 52 are provided.
- the functional power of the horizontal block vertical motion vector calculation unit 500 and the vertical motion vector determination unit 510 is implemented.
- Vertical motion vector detection unit 4 according to Embodiment 1 This is different from the horizontal block vertical motion vector calculator 50 and the vertical motion vector determiner 51.
- the horizontal block vertical motion vector calculation unit 500 uses the fourth threshold value output from the second horizontal block projection data maximum value storage unit 47, and uses the horizontal block projection data read unit 49.
- Each of the first horizontal block projection data read out in step 1 is converted to n values (n is an integer of 2 or more) to reduce the number of bits, and the n-valued projection data is converted from the third threshold intersection. Add for each distance. Then, the peak position information (vertical direction motion vector described later) and peak value information in the addition data are provided to the vertical direction motion vector determination unit 510.
- the vertical motion vector determination unit 510 determines the vertical motion vector of the image based on the output from the horizontal block vertical motion vector calculation unit 500.
- the vertical motion vector of the image determined here is output from the output terminal 52.
- the vertical motion vector determination unit 510 uses the first horizontal block projection data maximum value and the third threshold intersection stored in the first horizontal block projection data maximum value storage unit 45. The configuration is such that it receives information on the third threshold intersection output from the search unit 48 and uses it for processing to increase the reliability of the vertical motion vector. The specific operation will be described later in detail.
- FIG. 21 is a block diagram showing the main configuration of the horizontal block vertical motion vector calculation unit 500.
- the horizontal block vertical motion vector calculation unit 500 includes three input terminals 501 to 503, an n-value converter 504, and a first horizontal block projection obtained by n-value conversion by the n-value converter 504.
- An adder 505 for adding data a vertical motion vector addition memory 506 as a buffer memory for sequentially storing the data added by the adder 505, a peak detector 5070, and output terminals 508 and 509 /!
- the first horizontal block projection data output from the horizontal block projection data reading unit 49 is input to the input terminal 501 and the second horizontal block projection data maximum value is input to the input terminal 502.
- the fourth threshold value output from the storage unit 47 is input.
- information on the third threshold value intersection output from the third threshold value intersection search unit 48 is input to the input terminal 503.
- the n-value quantizer 504 converts the first horizontal block projection data input from the input terminal 501 into an n-value key (for example, a ternary value) based on the fourth threshold value input from the input terminal 502. )
- the adder 505 outputs the first horizontal block projection data n-valued by the n-value generator 504 and the data read from the vertical motion vector addition memory 506 to the third threshold intersection.
- the result of addition is stored in the vertical motion vector addition memory 506 again.
- the addition data for the horizontal block is output to the peak detector 5070.
- the peak detector 5070 is the peak position in the sum data output from the adder 505.
- the peak position detected by the peak detector 507 is input to the vertical motion vector determination unit 510 via the output terminal 508, and the peak value is manually input to the horizontal motion vector determination unit 510 via the output terminal 509. It will be. [0226] The operation of the motion vector detection device IB having the above configuration will be described below.
- the operation of the horizontal direction motion vector detection unit 2B is basically the same as the operation of the horizontal direction motion vector detection unit 2 described in Embodiment 1, and a duplicate description is omitted.
- the operation of the vertical block horizontal motion vector calculation unit 310 and the horizontal direction motion vector determination unit 320 will be mainly described.
- first threshold intersection search unit 29 the second vertical block projection data read from the second vertical block projection line memory 27 and the second vertical block projection data maximum value The intersection with the first threshold output from the storage unit 28 (first threshold intersection) is searched for in the horizontal direction.
- the information on the first threshold intersection obtained by the first threshold intersection searching unit 29 is sent to the vertical block projection data reading unit 30, the vertical block horizontal motion vector calculating unit 310, and the horizontal motion vector determining unit 320. Is output.
- the vertical direction block projection data reading unit 30 outputs the first frame of the current frame corresponding to the motion vector detection range centered on the first threshold intersection output from the first threshold intersection search unit 29.
- the motion vector detection range is the first threshold.
- the projection data read from the first vertical block projection line memory 26 is (A (i) â V) Force (A (i) + V) This is the partial data of the first vertical block projection data in the range.
- the first vertical block projection data read from the first vertical block projection line memory 26 by the vertical block projection data reading unit 30 is sent to the vertical block horizontal motion vector calculation unit 310. Is output.
- the first vertical block projection data output from the vertical block projection data reading unit 30 is converted into n values via the input terminal 311 of the vertical block horizontal motion vector calculation unit 310 shown in FIG. Input to the device 314. Since the processing of the n-value converter 314 has already been described with reference to FIG.
- the first threshold value intersection output from first threshold value intersection search unit 29 via input terminal 313 is used as an n-value by n-value converter 314.
- the first vertical block projection data and the addition value of the first n-valued vertical block projection data read from the horizontal motion vector addition memory 316 up to the previous one are added.
- the addition result is stored again in the horizontal motion vector addition memory 316.
- the n-valued first vertical block projection data regarding the last one of all the first threshold intersections detected by the first threshold intersection search unit 29 is added by the adder 315 to obtain one
- the addition result is output to the peak detector 3170. Note that after the addition processing in the adder 315 is completed, the addition results regarding all the first threshold intersections are stored, and the peak detection unit 3170 reads out the addition results from the horizontal motion vector addition memory 316. May be.
- the peak detector 3170 includes a motion threshold detection range centered on each first threshold intersection for all the first threshold intersections detected by the first threshold intersection search unit 29 (the above-mentioned (The range of V) is the force to which the data obtained by adding the n-valued first vertical block projection data (hereinafter also referred to as âvertical block n value â dataâ) is input.
- This vertical block n The peak value related to the digitized data is detected by the peak detector 3170.
- the peak position of the vertical block n-value â data detected by the peak detector 3170 becomes the horizontal motion vector obtained from the vertical block force, and is output to the horizontal motion vector determination unit 320 via the output terminal 318. Is output.
- the peak value at that time is output from the output terminal 319.
- the peak value of the added data obtained by adding and adding the horizontal motion vector (peak position) calculated for each vertical block by the peak detector 3170 and the n value of the vertical block. , Also referred to as âvertical direction block n-valued calorie calculation data peak valueâ) is input to the horizontal direction motion vector determination unit 320 via output terminals 318 and 319, respectively, and the vertical direction block n-valued addition data peak value is input. Is used to determine whether the vertical block is valid Z invalid.
- the horizontal direction motion vector of the entire image is based on the horizontal direction motion vector of each vertical block sequentially output from the vertical direction block horizontal direction motion vector calculation unit 310. Is determined.
- the calculated vertical motion vector determined as an invalid block is not used when determining the horizontal motion vector of the entire image.
- FIG. 22 is a diagram for explaining a method for determining valid Z invalidity of each vertical block by using the first vertical block projection data maximum value.
- FIG. 22 the image data of 640 pixels x 480 pixels shown in Fig. 9 (a) is taken as an example, and seven vertical blocks having a width (division width) of 64 pixels in the vertical direction are taken. The case of dividing into vb0 to vb6 is shown.
- the first vertical block projection data maximum value of each vertical block output from the first vertical block projection data maximum value storage unit 24 (FIG. 18) is shown. Each block is shown in hexadecimal notation.
- the medium force of the vertical block projection data maximum value of 1 is also determined as the maximum value in all blocks.
- the vertical block vb2 has the maximum value in all blocks, and this value is referred to as the total vertical block projection data maximum value.
- the horizontal direction motion vector determination unit 320 determines, as an invalid block, a vertical direction block having a maximum value of 1Z4 or less with respect to the maximum value of all vertical block projection data, for example.
- vertical blocks vbO, vbl, and vb6 are half-IJ disconnected from the invalid block.
- FIG. 23 is a diagram schematically illustrating determination of valid Z invalidity of a vertical block.
- a vertical block that is determined to be an invalid block can be said to have a small pattern (there are few clear parts) or a very fine pattern as a result. On the other hand, it can be judged that the reliability is low. Therefore, the reliability of the horizontal motion vector can be improved by not using the vertical block determined to be an invalid block for determining the horizontal motion vector of the entire image.
- the force described as the effective Z invalidity judgment condition being 1Z4 or less of the maximum value of all vertical block projection data, this is not limited to this. It may be 1Z8 or less. In this way, by setting the determination condition lZ2 n , it is possible to easily determine whether it is valid or invalid.
- FIG. 24 is a diagram for explaining a method of determining valid Z invalidity of each vertical block using the vertical block n-valued addition data peak value.
- the image data of 640 pixels â 480 pixels shown in (a) of FIG. 9 is taken as an example, and seven vertical blocks each having a width of 64 pixels (divided width) in the vertical direction. Minutes from vb0 to vb6 This shows the case of splitting.
- the vertical block n-valued addition data peak value of each vertical block output from the vertical block horizontal motion vector calculation unit 310 is 16 for each block. Shown in decimal notation.
- the horizontal direction motion vector determination unit 320 obtains the maximum value of the medium force of the vertical direction block n-valued addition data peak value in each of the vertical direction blocks vb0 to vb6.
- the vertical block vb4 has the maximum value, and this value is referred to as the maximum value of the vertical block n-valued addition data peak value.
- the vertical direction block n value A vertical block whose normalized data is less than a specified value B (for example, 7 in decimal notation) is determined as an invalid block.
- the vertical blocks vbO, vbl, vb5 and vb6 are determined as invalid blocks.
- the output of the adder 315 (Fig. 19) of the vertical block horizontal motion vector calculation unit 310 (Fig. 18) is the first n-valued with the second threshold value around the first threshold intersection.
- the vertical block projection data is added, and the larger the number of first threshold crossings and the larger the amplitude (mountain) exceeding the second threshold (2) on the positive side, the larger the value. Conversely, if there is an amplitude that exceeds the negative second threshold (-a2), it will be canceled.
- the maximum value of the output of the adder 315 that is, the vertical block n- valued sum data peak value of a certain vertical block is equal to or greater than the predetermined value A, while the other vertical blocks
- the vertical block n-valued addition data peak value is less than or equal to the predetermined value B, it can be said that the other vertical block has a pattern in which the addition result is canceled or a pattern with fewer features and less amplitude.
- FIG. 25 is a diagram schematically illustrating determination of valid Z invalidity of a vertical block.
- the horizontal axis is the maximum value of the vertical blocks n-valued added data peak value and the vertical axis represents the graph with the vertical block n-valued added data peak value, vertical blocks n value conversion
- the maximum value of the added data peak value is equal to or greater than the predetermined value A
- an operation for determining a vertical block whose vertical block n-valued added data is equal to or smaller than the predetermined value B as an invalid block is shown.
- the maximum value of the vertical block n-valued addition data peak value is smaller than the predetermined value A.
- the vertical block n-valued addition data peak value is equal to or less than the predetermined value B. It also shows that even if there is another block, the block is not judged as an invalid block.
- the effective Z / invalidity determination condition is a force indicating an example in which the predetermined value A is 12 and the predetermined value B is 7.
- the number of horizontal pixels of the image is not limited to this. For example, if the number of pixels in the horizontal direction is 640 pixels, the predetermined value A can be set to a value of about 10 and the predetermined value B can be set to a value about half of that.
- FIG. 26 is a diagram for explaining a method of determining the effective Z invalidity of each vertical block using the number of first threshold intersections.
- Fig. 26 the image data of 640 pixels x 480 pixels shown in (a) of Fig. 9 is taken as an example, and seven vertical blocks having a width (division width) of 64 pixels in the vertical direction are taken as an example. The case of dividing into vb0 to vb6 is shown.
- FIG. 26 the number of first threshold intersections output from the first threshold intersection searching unit 29 (FIG. 18) is shown in hexadecimal notation for each block.
- the waveform of the second vertical block projection data related to the previous frame stored in the second vertical block projection line memory 27 and the second vertical block projection data are stored.
- Information on the first threshold intersection at which the first threshold calculated by the direction block projection data maximum value storage unit 28 intersects is output. This information also includes information on the number of first threshold intersections. As shown in FIG. 26, the number of first threshold intersections is obtained for each of the vertical blocks vb0 to vb6.
- FIG. 27 is a diagram schematically illustrating determination of valid Z invalidity of a vertical block.
- the horizontal axis represents the maximum number of first threshold intersections in each of the vertical blocks vb0 to vb6, and the vertical axis represents the number of first threshold intersections.
- the number of first threshold intersections in the vertical blocks vb0 to vb6 is equal to or less than the number of first threshold intersections for blocks having a predetermined value D (for example, 3 in decimal notation) or less. Regardless of the maximum value, it is determined as an invalid block.
- the vertical blocks vbO and vb6 are determined to be invalid blocks.
- the reliability of the horizontal motion vector can be improved by not using the vertical block determined to be an invalid block for determining the horizontal motion vector of the entire image.
- the number of first threshold intersections is at least equal to or less than the number of pixels in the horizontal direction, and if the number is too large compared to the number of pixels in the horizontal direction, a very periodic pattern is captured. Therefore, for example, when the value is equal to or greater than a predetermined value E (for example, more than half of the number of pixels in the horizontal direction), the block may be determined as an invalid block.
- a predetermined value E for example, more than half of the number of pixels in the horizontal direction
- a block having a predetermined value D or less is determined as an invalid block. It may be configured to do so. In this case, if the maximum value of the number of first threshold intersections is smaller than the predetermined value, even if there is a block with a predetermined value D or less, the block is not judged as an invalid block and is invalid.
- the block criteria can be set more carefully.
- the method of determining the valid Z invalidity of each vertical block the vertical block n-valued sum data peak value is used.
- the invalid block is determined and the invalid block is determined. It is possible to improve the reliability of the motion vector by not using the calculated horizontal motion vector when determining the horizontal motion vector of the entire image.
- the effective Z invalidity is determined using the first vertical block projection data maximum value, and the effective Z invalidity of each vertical block is determined using the vertical block n-valued addition data peak value.
- the effective Z invalidity is determined using the first vertical block projection data maximum value, and the effective Z invalidity of each vertical block is determined using the first threshold intersection information. Also good! ,.
- the horizontal motion vector determination unit 320 determines the effective Z invalidity of the vertical block, and the horizontal motion vector force of the vertical block determined to be an effective block is also the horizontal motion vector of the entire image. To decide.
- FIG. 29 An example of a method for determining the horizontal motion vector of the entire image will be described with reference to FIGS. 29 and 30.
- FIG. 29 An example of a method for determining the horizontal motion vector of the entire image will be described with reference to FIGS. 29 and 30.
- 29 and 30 show the case where the detection range of the horizontal motion vector is V to V.
- V the case where V is 31 is shown as an example, and from 31 to 31 1 vector interval is displayed. It should be noted that the numbers displayed in the boxes provided for the respective vectors represent the number of vertical blocks having the same vector.
- the horizontal motion vector 6 is calculated with two vertical blocks. Force All other vertical blocks have disjoint horizontal motion vectors. The minimum value of the distribution range is 14, and the maximum value is 27. The difference 41 is the motion vector detection range. It can be said that there is a great variation.
- the sand corresponding to the horizontal motion vector obtained from each vertical block in the current frame is hatched! /.
- the horizontal direction motion vector determination unit 320 the difference between the maximum value and the minimum value of the horizontal direction motion vector distribution range obtained from each vertical block is greater than or equal to a predetermined threshold B (for example, V described above).
- a predetermined threshold B for example, V described above.
- the number of vertical blocks having the horizontal motion vector 6 is a predetermined numerical value.
- the numerical value A and the threshold value B are not limited to the above-described values. Further, the determination of the fluctuation is not limited to the above-described difference between the maximum value and the minimum value of the horizontal motion vector, and the standard deviation is used. May be judged to be large.
- the horizontal motion vector of the current frame is calculated by the following procedure.
- the outline is the closest to the horizontal motion vector of the previous frame, and the horizontal motion vector is the horizontal motion vector of the current frame. It is what.
- the horizontal direction motion vector determination unit 320 also calculates each vertical direction block block. The determined horizontal motion vector is determined to be reliable.
- the horizontal motion vector 5 is the horizontal motion vector of the previous frame
- the horizontal motion vector obtained from each vertical block of the current frame closest to this is the horizontal motion vector.
- Directional motion vector 6. Accordingly, the horizontal motion vector 6 is determined as the horizontal motion vector of the current frame.
- the sand corresponding to the horizontal motion vector obtained for each vertical block force in the current frame is hatched
- the block corresponding to the horizontal motion vector of the previous frame is hatched. Attached.
- the horizontal motion vector 8 becomes the horizontal motion vector of the current frame.
- the average that is, the horizontal motion vector of the previous frame itself is used as the horizontal motion vector of the current frame. I'll do it.
- the information on the horizontal motion vector of the previous frame is stored in a predetermined storage unit (previous frame horizontal motion vector storage means) provided in the horizontal motion vector decision unit 320. It is configured to read as needed.
- a predetermined storage unit previously frame horizontal motion vector storage means
- the low-reliability V and vertical blocks are excluded by the operation of determining whether the vertical blocks are valid or invalid, and the high-reliability is calculated based on the vertical blocks.
- the reliability of the horizontal motion vector of the entire image is evaluated in consideration of variations in the horizontal motion vector that is output, and even if it is determined to be reliable, by considering the horizontal motion vector of the previous frame, A little uncomfortable with movement from the previous frame A horizontal motion vector can be determined.
- the operation of the vertical motion vector detection unit 4B is basically the same as the operation of the vertical motion vector detection unit 4 described in Embodiment 1, and a duplicate description is omitted.
- the operations of the horizontal block vertical motion vector calculation unit 500 and the vertical direction motion vector determination unit 510 will be mainly described.
- the third threshold intersection search unit 48 the second horizontal block projection data read from the second horizontal block projection line memory 46 and the second horizontal block projection data maximum value are obtained.
- the intersection with the third threshold (third threshold intersection) output from the storage unit 47 is searched in the vertical direction.
- the information on the third threshold intersection obtained by the third threshold intersection searching unit 48 is sent to the horizontal block projection data reading unit 49, the horizontal block vertical motion vector calculating unit 500, and the vertical motion vector determining unit 510. Is output.
- the horizontal block projection data reading unit 49 outputs the first frame of the current frame corresponding to the motion threshold detection range centered on the third threshold intersection output from the third threshold intersection searching unit 48.
- the horizontal block projection data is read from the first horizontal block projection line memory 44.
- the projection data read from the first horizontal block projection line memory 44 is (B
- the (i) âU) force is also partial data of the first horizontal block projection data in the range up to (B (i) + U).
- the first horizontal block projection data read from the first horizontal block projection line memory 44 by the horizontal block projection data reading unit 49 is sent to the horizontal block vertical motion vector calculation unit 500. Is output.
- the first horizontal block projection data output from the horizontal block projection data readout unit 49 is input to the horizontal block vertical motion vector calculation unit 500 shown in FIG. It is input to the n-value converter 504 via the power terminal 501. Since the processing of the n-value converter 504 has been described with reference to FIG. 10, the description thereof is omitted.
- the third threshold intersection searching unit 48, the horizontal block projection data reading unit 49, and the horizontal block vertical motion vector calculation unit 500 (basically the same as the horizontal block vertical motion vector calculation unit 50) The operation of) has already been described with reference to FIG.
- the third threshold value intersection search unit 48 output power via input terminal 503 is used as the center, and n value generator 504 outputs n value.
- the first horizontal block projection data converted into the first horizontal block projection data added to the previous n values read from the vertical motion vector addition memory 506 are added together. Then, the addition result is stored in the vertical motion vector addition memory 506 again.
- the adder 505 adds the n-valued first horizontal block projection data for the last one of all the third threshold intersections detected by the third threshold intersection search unit 48 to add 1
- the summing result is output to the peak detector 5070.
- the peak detection unit 5070 reads out the addition result from the vertical motion vector addition memory 506 storing the addition results regarding all the third threshold intersections. Also good.
- the peak detector 5070 includes a motion threshold detection range centered on each third threshold intersection for all the third threshold intersections detected by the third threshold intersection search unit 48 ( â Force that receives the data obtained by adding the n-valued first horizontal block projection data corresponding to (range U) (hereinafter also referred to as âhorizontal block n value â dataâ).
- This horizontal block n The peak value for the value key is detected by the peak detector 5070.
- the peak position of the horizontal block n value â data detected by this peak detector 5070 becomes the vertical motion vector obtained from the horizontal block force, and is output to the vertical motion determination unit 510 via the output terminal 508. Is done. Similarly, the peak value at that time is output from the output terminal 509.
- the specific operations of the adder 505 and the peak detection unit 5070 are described with reference to FIG. 15, and the adder 505 of the horizontal block vertical motion vector calculation unit 50 described above is used.
- the force is the same as that of the peak detector 507 and the description is omitted.
- the vertical motion vector (peak position) calculated for each horizontal block by the peak detector 507 and the added data obtained by adding the n-valued horizontal block The peak value (hereinafter also referred to as âhorizontal block n-valued addition data peak valueâ) is input to the vertical motion vector determination unit 510 via the output terminals 508 and 509, respectively, and the horizontal block n-value addition is performed.
- the data peak value is used for valid Z invalidity judgment of the horizontal block.
- the vertical direction of the entire image is determined based on the vertical direction motion vector of each horizontal block sequentially output from the horizontal direction block vertical direction motion vector calculation unit 500. A motion vector is determined.
- the vertical direction motion vector determination unit 510 the first horizontal block projection data maximum value output from the first horizontal direction block projection data maximum value storage unit 45, the horizontal direction block vertical motion Horizontal block n value output from vector calculation unit 500 â
- Addition data peak value and third threshold intersection search unit 48 output from third threshold intersection information Valid Z block invalid for each horizontal block Determine.
- the vertical motion vector calculated as the horizontal block force determined to be an invalid block is not used when determining the vertical motion vector of the entire image.
- FIG. 31 is a diagram for explaining a method of determining valid Z invalidity of each horizontal block using the first horizontal block projection data maximum value.
- FIG. 31 the image data of 640 pixels x 480 pixels shown in (a) of Fig. 13 is taken as an example, and 10 horizontal directions having a width (divided width) of 64 pixels in the horizontal direction. This shows the case where the block is divided into hbO to hb9.
- FIG. 31 the first horizontal block projection data maximum value of each horizontal block output from the first horizontal block projection data maximum value storage unit 45 (FIG. 20) is shown as Each block is shown in hexadecimal notation.
- the horizontal direction blocks hbO to hb9 The medium force of the horizontal block projection data maximum value of 1 is also determined as the maximum value in all blocks.
- the horizontal block hb4 has the maximum value in all blocks, and this value is referred to as the all horizontal block projection data maximum value.
- the vertical motion vector determination unit 510 determines, as an invalid block, a horizontal block having a maximum value of, for example, 1Z4 or less with respect to the maximum value of all horizontal block projection data.
- the horizontal blocks hbO, hbl, hb8 and hb9 are determined to be invalid blocks.
- FIG. 32 is a diagram schematically illustrating determination of valid Z invalidity of a horizontal block.
- a horizontal block that is determined to be an invalid block can be said to have a few features (there are few clear parts) or a very fine design as a pattern. On the other hand, it can be judged that the reliability is low. Therefore, the reliability of the vertical motion vector can be improved by not using the horizontal block determined to be an invalid block for determining the vertical motion vector of the entire image.
- the force described as the valid Z invalidity judgment condition being 1Z4 or less of the maximum value of all horizontal block projection data, it is not limited to this. It may be 1Z8 or less. In this way, by setting the determination condition lZ2 n , it is possible to easily determine whether it is valid or invalid.
- FIG. 33 is a diagram for explaining a method for determining valid Z invalidity of each horizontal block using the horizontal block n-valued addition data peak value.
- FIG. 33 the image data of 640 pixels x 480 pixels shown in (a) of Fig. 13 is taken as an example, and 10 horizontal directions having a width (divided width) of 64 pixels in the horizontal direction are taken. This shows the case where the block is divided into hbO to hb9.
- the horizontal block vertical motion vector calculation unit 500 (Fig. 20 The horizontal block n-valued addition data peak value of each horizontal block output from) is shown in hexadecimal notation for each block.
- the vertical motion vector determination unit 510 obtains the maximum value of the medium force of the horizontal direction block n-valued addition data peak value in each of the horizontal direction blocks hbO to hb9.
- the horizontal block hb4 has the maximum value, and this value is referred to as the maximum value of the horizontal block n-valued addition data peak value.
- the vertical direction motion vector determination unit 510 when the maximum value of the horizontal block n-valued addition data peak value is equal to or greater than a predetermined value A (for example, 12 in decimal notation), the horizontal direction block n value A horizontal block whose summation data is less than or equal to a predetermined value B (for example, 7 in decimal notation) is determined as an invalid block.
- a predetermined value A for example, 12 in decimal notation
- a predetermined value B for example, 7 in decimal notation
- the output of the adder 505 (Fig. 21) of the horizontal block vertical motion vector calculation unit 500 (Fig. 20) is the first n-valued with the fourth threshold value centered on the third threshold value intersection.
- the horizontal block projection data is added, and the larger the number of third threshold intersections and the larger the amplitude (mountain) exceeding the fourth threshold (4) on the plus side, the larger the value. Conversely, if there is an amplitude that exceeds the negative fourth threshold (one â 4), it will be canceled.
- the maximum value of the output of the adder 505 that is, the horizontal block â - value added data peak value of a certain horizontal block is equal to or greater than the predetermined value â , while the other horizontal blocks
- the peak value of the n-valued addition data of the horizontal block is less than or equal to the predetermined value B, it can be said that the other horizontal block is a picture with the addition result canceled or a picture with less features and less amplitude.
- the block having the horizontal block n-valued addition data peak value force of the predetermined value B or less is less reliable than the block of the predetermined value A or more. Therefore, the reliability of the vertical motion vector can be improved by not using the horizontal block determined to be an invalid block for determining the vertical motion vector of the entire image.
- Fig. 34 is a diagram schematically showing determination of validity Z invalidity of a horizontal block.
- the horizontal axis represents the maximum value of the horizontal block n-valued addition data peak value
- the vertical axis represents the horizontal block n-valued addition data peak value.
- the horizontal block n-valued addition data peak value is equal to or less than the predetermined value B. It also shows that even if there is another block, the block is not judged as an invalid block.
- the effective Z / invalidation condition is a force indicating an example in which the predetermined value A is set to 12 and the predetermined value B is set to 7.
- the number of pixels in the vertical direction of the image is not limited to this. For example, if the number of pixels in the vertical direction is 80 pixels, the predetermined value A can be set to a value of about 10 and the predetermined value B can be set to a value about half of that.
- FIG. 35 is a diagram for explaining a method for determining valid Z invalidity of each vertical block using the number of third threshold intersections.
- Fig. 35 the image data of 640 pixels x 480 pixels shown in Fig. 13 (a) is taken as an example, and 10 horizontal directions having a width (divided width) of 64 pixels in the horizontal direction are taken. This shows the case where the block is divided into hbO to hb9.
- FIG. 35 the number of third threshold intersections output from the third threshold intersection searching unit 48 (FIG. 20) is shown in hexadecimal notation for each block.
- the waveform of the second horizontal block projection data relating to the previous frame stored in the second horizontal block projection line memory 46, and the second horizontal block Outputs information on the third threshold intersection at which the third threshold calculated by the projection data maximum value storage unit 45 intersects.
- This information also includes information on the number of third threshold intersections. As shown in Fig. 35, for each horizontal block hbO to hb9 The number of third threshold intersections is obtained.
- Fig. 36 is a diagram schematically showing determination of valid Z invalidity of a horizontal block.
- the horizontal axis represents the maximum number of the third threshold intersections in the horizontal blocks hbO to hb9
- the vertical axis represents the number of the third threshold intersections.
- the third threshold crossing point in each horizontal block hbO to hb9 is the third block for the block having a predetermined value D (for example, 3 in decimal notation) or less. Regardless of the maximum number of threshold intersections, it is determined as an invalid block. In the example of FIG. 35, the horizontal blocks hbO and hb9 are determined to be invalid blocks.
- the reliability of the vertical motion vector can be improved by not using the horizontal block determined to be an invalid block for determining the vertical motion vector of the entire image.
- the number of the third threshold intersections is at least the number of pixels in the vertical direction, and if the number is too large compared to the number of pixels in the vertical direction, a very periodic pattern is captured. Therefore, for example, when the value is equal to or greater than a predetermined value E (for example, more than half of the number of pixels in the vertical direction), the block may be determined to be an invalid block.
- a predetermined value E for example, more than half of the number of pixels in the vertical direction
- the number of third threshold intersections is 241 and is more than half of the number of vertical pixels, so it is determined as an invalid block.
- a block having a predetermined value D or less is determined as an invalid block. It may be configured to do so. In this case, if the maximum value of the number of the third threshold intersections is smaller than the predetermined value, even if there is a block with the predetermined value D or less, the block is not determined as an invalid block and is invalid.
- the block criteria can be set more carefully.
- the valid / invalid determination condition is that the predetermined value D is 3 and the predetermined value E is half the number of pixels in the vertical direction has been described.
- the present invention is not limited to this. It is not a thing.
- each horizontal block n-valued sum data peak value is used to determine each horizontal block. It is invalid by using the method of judging the effective Z invalidity of the direction block and the method of judging the valid Z invalidity of each horizontal block using the information of the third threshold intersection.
- the horizontal block force determined as an invalid block is determined as a block, and the calculated vertical motion vector is not used when determining the vertical motion vector of the entire image. Can be increased.
- the effective Z invalidity is determined using the first horizontal block projection data maximum value, and the effective Z invalidity of each horizontal block is determined using the horizontal block n-valued addition data peak value. It is also possible to determine valid Z invalidity using the first horizontal block projection data maximum value, and to determine valid Z invalidity of each horizontal block using information on the third threshold intersection. Also good! ,.
- the vertical motion vector determination unit 510 determines the effective Z invalidity of the horizontal block, and the vertical motion vector force of the horizontal block determined to be an effective block is also the vertical motion vector of the entire image. Decide.
- FIGS. 38 and 39 show the case where the detection range of the horizontal motion vector is U to U.
- U is 31
- from 31 to 31 1 vector interval is displayed.
- the numbers displayed in the boxes provided for the respective vectors represent the number of horizontal blocks having the same vector.
- the vertical direction motion vector determination unit 510 when the difference between the maximum value and the minimum value of the vertical direction motion vector obtained from each horizontal block is equal to or greater than a predetermined threshold B (for example, U described above), The vertical motion vector that also obtains horizontal blocking force is assumed to be 0, assuming that the vertical motion vector has low reliability.
- a predetermined threshold B for example, U described above
- each horizontal block force is obtained in the vertical direction. It is determined that the motion vector is sufficiently reliable.
- the numerical value A and the threshold value B are not limited to the values described above. Further, the determination of the fluctuation is not limited to the above-described difference between the maximum value and the minimum value of the vertical motion vector, and the standard deviation is used. May be judged to be large.
- the vertical motion margin of the current frame is calculated by the following procedure.
- the outline is that the vertical motion vector output from each horizontal block of the current frame is closest to the vertical motion vector of the previous frame, and the vertical motion vector is the vertical motion vector of the current frame. It is what.
- the vertical motion vector 8 is the vertical motion vector of the previous frame, and the vertical motion vector obtained from each horizontal block of the current frame closest to this is the vertical motion vector.
- the sand corresponding to the vertical motion vector obtained for each horizontal block force of the current frame is hatched, and the block corresponding to the vertical motion vector of the previous frame is hatched. Attached.
- the vertical direction motion vector 5 becomes the horizontal direction motion vector of the current frame.
- the information on the vertical motion vector of the previous frame is stored in a predetermined storage unit (previous frame vertical motion vector storage means) provided in the vertical motion vector determination unit 510, and is necessary. Is configured to read in response to
- the operation of determining whether the horizontal block is valid Z is invalid or not. Evaluate the reliability of the vertical motion vector of the entire image in consideration of variations in the vertical motion vector calculated in this way, and consider the vertical motion vector of the previous frame even if it is determined to be reliable. Thus, it is possible to determine a vertical motion vector with less sense of incongruity taking into account the motion from the previous frame.
- the horizontal direction motion vector determination unit 320 includes the first vertical direction block projection data maximum value storage unit. 1st vertical block projection data maximum value output from 24, vertical block horizontal motion vector calculation unit 310 output from vertical block n-valued addition data peak value, first threshold value intersection search unit Based on the information on the first threshold intersection output from 29, the effective block Z of the vertical block is judged to be invalid. As a result, a highly reliable horizontal motion vector can be calculated.
- the reliability of the horizontal motion vector of the entire image is evaluated by considering the variation of the horizontal motion vector calculated based on the highly reliable vertical block, the reliability is determined.
- the horizontal motion vector of the previous frame it is possible to determine the horizontal motion vector with less sense of incongruity reflecting the motion of the previous frame force.
- the first horizontal direction block projection data output from the first horizontal direction block projection data maximum value storage unit 45 in the vertical direction motion vector determination unit 510.
- a directional motion vector can be calculated.
- the vertical motion vector calculated based on a highly reliable horizontal block is evaluated for the reliability of the vertical motion vector of the entire image in consideration of variations, and it is determined that the motion vector is reliable.
- the vertical motion vector of the previous frame it is possible to determine the vertical motion vector with less sense of incongruity reflecting the motion of the previous frame force.
- the vertical image dividing unit 21 divides the frame image. Since the vertical edge is emphasized for each divided image (vertical block) after dividing in the straight direction, a divided image in which the vertical edge is emphasized can be easily generated. Similarly, the horizontal image dividing unit 41 divides the frame image in the horizontal direction, and then emphasizes the edge in the horizontal direction for each divided image (horizontal block). Can be generated easily.
- the motion vector detection device 1C according to the fourth embodiment of the present invention has a force similar to that of the motion vector detection device 1 according to the first embodiment. And the vertical direction motion vector detection unit are different.
- FIG. 40 is a block diagram showing the main configuration of the horizontal direction motion vector detection unit 2C.
- parts having the same functions as those in the horizontal motion vector detection unit 2B described in the third embodiment are denoted by the same reference numerals, and redundant description is omitted.
- the edge enhancement unit of the horizontal direction motion vector detection unit 2C the vertical direction image segmentation unit 21 and the vertical direction edge extraction filtering unit 22 are compared with the edge enhancement unit of the horizontal direction motion vector detection unit 2B of the third embodiment. The arrangement with is reversed. Hereinafter, the operation of the horizontal direction motion vector detection unit 2C will be described.
- the extraction filtering unit 22 performs extraction processing for extracting edge components extending in the vertical direction, in other words, enhancing an image portion that changes sharply in the horizontal direction.
- the vertical image dividing unit 21 sets a plurality of image regions (vertical blocks) obtained by dividing the frame image subjected to edge enhancement in the vertical direction. From this In the subsequent processing, processing and management are performed for each vertical block.
- the image data divided by the vertical image dividing unit 21 is input to the vertical block projecting unit 23.
- the processing after the vertical block projecting unit 23 is the horizontal direction motion vector of the third embodiment. Processing similar to that of the detection unit 2B is performed.
- FIG. 41 is a block diagram showing the main configuration of the vertical motion vector detection unit 4C.
- parts having the same functions as those in the vertical direction motion vector detection unit 4B described in the third embodiment are denoted by the same reference numerals, and redundant description is omitted.
- edge enhancement unit of the vertical motion vector detection unit 4C the horizontal image segmentation unit 41 and the horizontal direction edge extraction filtering unit 42 are compared with the edge enhancement unit of the vertical direction motion vector detection unit 4B of the third embodiment. The arrangement with is reversed. Hereinafter, the operation of the vertical motion vector detection unit 4C will be described.
- the extraction filtering unit 42 performs extraction of edge components extending in the horizontal direction, in other words, filtering processing that emphasizes an image portion that changes sharply in the vertical direction.
- the horizontal image dividing unit 41 sets a plurality of image regions (horizontal blocks) obtained by dividing the frame image subjected to edge enhancement in the horizontal direction. Thus, in the subsequent processing, processing and management are performed for each horizontal block.
- the image data divided by the horizontal image dividing unit 41 is input to the horizontal block projecting unit 43.
- the processing after the horizontal block projecting unit 43 is the vertical direction motion vector according to the third embodiment. Processing similar to that of the detection unit 4B is performed.
- the vertical edge extraction filtering unit 22 emphasizes the edge in the vertical direction with respect to the frame image, and then performs the edge-enhanced frame. Since the image is divided in the vertical direction by the vertical image dividing unit 21, a divided image in which the edge in the vertical direction is emphasized can be easily generated.
- the horizontal image dividing unit 41 divides the edge image with the edge in the horizontal direction. Split images with enhanced edges can be easily generated.
- the vertical edge extraction filtering unit 22 and the horizontal edge extraction filtering unit 42 are separately arranged in the horizontal motion vector detection unit 2A and the vertical motion vector detection unit 4A.
- the vertical edge extraction filtering unit 22 and the horizontal edge extraction filtering unit 42 are both provided with a horizontal Z vertical edge extraction filtering unit that integrates the functions of the vertical edge extraction filtering unit 22 and the output of the vertical image segmentation unit 21.
- the image data may be input to each of the horizontal image dividing unit 41.
- the threshold process for determining the magnitude relationship with a predetermined threshold For the vertical edge extraction filtering unit and the horizontal edge extraction filtering unit in each of the above embodiments, after the filtering process for performing edge extraction, for example, âwith edgeâ is performed by the threshold process for determining the magnitude relationship with a predetermined threshold. It is also possible to perform binarization of âno edgeâ or ternization of âwith positive edgeâ, âwithout edgeâ, and âwith negative edgeâ. By performing such threshold processing, it is possible to treat the edges having a luminance change (luminance gradient) equal to or greater than a predetermined threshold in the same manner.
- the data output from the bit number reduction unit 25 is converted into the first vertical block projection line memory 26 and the second vertical block projection by, for example, switch switching for each frame.
- the line memory 27 may be alternately input.
- the data output from the horizontal block projection unit 43 is transferred to the first horizontal block projection line memory 44 and the second horizontal block projection line memory 46 by, for example, switch switching for each frame. You may make it make it input alternately.
- the data output from the vertical (horizontal) direction block projection unit is stored in the first vertical (horizontal) direction block projection data maximum value storage unit by, for example, switch switching for each frame.
- the second vertical (horizontal) block projection data maximum value storage unit may be alternately input.
- the "previous frame" in the present invention is not limited to the previous frame, but also includes two or more previous frames. For example, when a frame in the middle is skipped by the frame skipping process, the frame before the skipped frame is included.
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Description
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JP2010003094A (ja) * | 2008-06-19 | 2010-01-07 | Fujitsu Ltd | ç»ååŠçè£ çœ®ãç»ååŠçæ¹æ³ãåã³ããã°ã©ã |
CN111292354A (zh) * | 2020-01-22 | 2020-06-16 | 绎æ²ç§»åšéä¿¡æéå ¬åž | 误æ£æµæå¶æ¹æ³åçµåè®Ÿå€ |
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CN107274364B (zh) * | 2017-06-06 | 2020-01-31 | äžç§å蟟蜯件è¡ä»œæéå ¬åž | äžç§åŸåå¢åŒºæ¹æ³åè£ çœ® |
Citations (3)
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JP2002279430A (ja) * | 2001-03-14 | 2002-09-27 | Lg Electronics Inc | åããã¯ãã«æ€åºåè·¯ |
JP2004343483A (ja) * | 2003-05-16 | 2004-12-02 | Acutelogic Corp | ææ¯ãè£æ£è£ 眮ããã³æ¹æ³ãææ¯ãæ€åºè£ 眮 |
JP2006268413A (ja) * | 2005-03-24 | 2006-10-05 | Mitsubishi Electric Corp | ç»ååããã¯ãã«æ€åºè£ 眮 |
-
2007
- 2007-02-06 WO PCT/JP2007/052011 patent/WO2008023466A1/ja active Application Filing
- 2007-02-06 EP EP07708111A patent/EP2061007A1/en not_active Withdrawn
Patent Citations (3)
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JP2002279430A (ja) * | 2001-03-14 | 2002-09-27 | Lg Electronics Inc | åããã¯ãã«æ€åºåè·¯ |
JP2004343483A (ja) * | 2003-05-16 | 2004-12-02 | Acutelogic Corp | ææ¯ãè£æ£è£ 眮ããã³æ¹æ³ãææ¯ãæ€åºè£ 眮 |
JP2006268413A (ja) * | 2005-03-24 | 2006-10-05 | Mitsubishi Electric Corp | ç»ååããã¯ãã«æ€åºè£ 眮 |
Cited By (2)
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JP2010003094A (ja) * | 2008-06-19 | 2010-01-07 | Fujitsu Ltd | ç»ååŠçè£ çœ®ãç»ååŠçæ¹æ³ãåã³ããã°ã©ã |
CN111292354A (zh) * | 2020-01-22 | 2020-06-16 | 绎æ²ç§»åšéä¿¡æéå ¬åž | 误æ£æµæå¶æ¹æ³åçµåè®Ÿå€ |
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EP2061007A1 (en) | 2009-05-20 |
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