CN101854547B - Motion frame in video collection and transmission system, method and system for detecting prospects - Google Patents
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Abstract
The invention provides a motion frame in a video collection and transmission system, a method and a system for detecting prospects. The system comprises a video compression unit and a prospect detection unit which comprises an information extraction unit and a motion detection unit, wherein the information extraction unit acquires a coding mode, a motion vector and a direct current component coefficient in a compression code flow, and sets the output result matrix of the current frame; the motion detection unit judges the motion of the block base of the current frame according to the coding mode, the motion vector and the direct current component acquired by the information extraction unit and inputs the result matrix; and the result matrix is utilized to judge the motion of the current frame to realize prospect detection.
Description
[technical field]
The present invention relates to the electronic monitoring field, particularly about method and the device of motion frame and foreground detection in a kind of video acquisition transmission system.
[background technology]
in the video acquisition transmission system of prior art, because the amount of image information of video acquisition is very large, for reducing the image transmitting amount of information of video acquisition, existing video acquisition transmission system, for example in supervisory control system, the coding video data compression that normally at first the image collecting device of front end in supervisory control system is gathered, wherein utilize inter-frame prediction method in piece base frame to remove redundancy on the video data space time in cataloged procedure, like this can be little more a lot of than the data data volume of not passing through compression coding through the view data after compression coding, can save the amount of information of transfer of data like this, raise the efficiency.
When coding video data is compressed, usually video data can be divided into the coding mode of frame in inter-frame or frame, and utilize in interframe encode current block in facing reference frame mutually near the position carry out motion estimation search and obtain the residual sum motion vector and realize.So can comprise the various information such as coding mode, motion vector in the code stream result to output after the coding video data compression.
Whether there is the foreground detection method of moving object usually can adopt the method for the poor or background subtraction of frame in existing detection one frame picture; but the data volume that these methods need is very large, causes existing monitoring frontend to be difficult to realize at front end detection and the warning function of motion due to the constraint that is subjected to equipment computing capability and memory space.
Therefore, be necessary to provide a kind of demand data amount less foreground detection method, to overcome the defective described in background technology.
[summary of the invention]
The object of the present invention is to provide the method for foreground detection in a kind of video acquisition transmission system, it can take full advantage of the compressed bit stream information of encoder, only needs view data still less, and computing is simple.
Another object of the present invention is to provide the device of foreground detection in a kind of video acquisition transmission system, it can take full advantage of the compressed bit stream information of encoder, only needs view data still less, and computing is simple.
A further object of the present invention is to provide the detection method of motion frame in a kind of video acquisition transmission system.
Another purpose of the present invention is to provide the device that in a kind of video acquisition transmission system, motion frame detects.
For reaching aforementioned purpose, the method for foreground detection in a kind of video acquisition transmission system of the present invention, it comprises: the video data that gathers is carried out the Video coding compression;
Obtain the information in the video data compression code stream after compression coding;
Set according to the coding mode of the present frame in the aforementioned information of obtaining, if present frame is interframe encoding mode, set the Output rusults matrix of present frame, wherein matrix each the point corresponding present frame each piece, further judge whether each piece in present frame moves, be when motion when described, change the numerical value to point that should piece in described matrix of consequence into non-zero values, otherwise be zero; With
Export described matrix of consequence, image corresponding to piece corresponding to the non-zero values in described matrix of consequence is prospect.
Further, the described information of obtaining comprises the motion vector of piece, describedly further judge whether each in present frame piece moves and comprise: according to described of the motion vector of certain piece that obtains and described position acquisition at current matrix in the position of reference block in the previous frame matrix corresponding to former frame, check whether reference block moves, if reference block is motion, current block is motion.
Further, the described information of obtaining comprises motion vector and the DC component of piece, describedly further judges whether each in present frame piece moves and comprises: the move distance of asking for piece according to the motion vector of the piece that obtains; Move distance is carried out threshold segmentation, surpass the moving mass that is judged as of threshold values; For move distance less than the further value that judges DC component of threshold values whether greater than pre-set threshold value, if greater than described be moving mass.
Further, the described information of obtaining comprises the coding mode of frame of video and piece, describedly further judge whether each in present frame piece moves and comprise: the coding mode according to each piece that obtains judges whether each piece moves, if in frame piece described be moving mass.
According to one embodiment of the invention, it further is included in each piece of judgement for after motion, described matrix of consequence being carried out smothing filtering described method.
for reaching aforementioned another purpose, foreground detection device in a kind of video acquisition transmission system of the present invention, wherein said video acquisition transmission system comprises the video acquisition unit that gathers video, the video data of video acquisition unit collection is carried out the Video coding compression unit of Video coding compression, described foreground detection device comprises the foreground detection unit that the video data after compression is carried out foreground detection, described foreground detection unit comprises information extraction unit and motion detection unit, the information extraction unit of described foreground detection unit is obtained the information in video data compression code stream after compression coding, the coding mode of the present frame that the motion detection unit of foreground detection unit is obtained according to information extraction unit, if interframe encoding mode, set the Output rusults matrix of present frame, wherein matrix each the point corresponding present frame each piece, further judge whether each piece in present frame moves, when piece is motion, change the numerical value to point that should piece in described matrix of consequence into non-zero values, otherwise be zero, in described matrix of consequence, data are that image corresponding to piece corresponding to non-zero values is prospect.
for reaching the aforementioned purpose again of the present invention, motion frame checkout gear in a kind of video acquisition transmission system of the present invention, wherein said video acquisition transmission system comprises the video acquisition unit that gathers video, the video data of video acquisition unit collection is carried out the Video coding compression unit of Video coding compression, described motion frame checkout gear comprises the foreground detection unit that the video data after compression is carried out foreground detection, described foreground detection unit comprises information extraction unit and motion detection unit, the information extraction unit of described foreground detection unit is obtained the information in video data compression code stream after compression coding, the video data encoding information that the motion detection unit of foreground detection unit is obtained according to information extraction unit judges whether present frame moves, wherein the coding mode of the present frame that obtains according to information extraction unit of motion detection unit judges whether present frame moves, if being intra-frame encoding mode, present frame judges that present frame is motion, if present frame is interframe encoding mode, whether each piece that further judges present frame moves, if there be any to be motion, described frame is motion, motion detection unit judges that whether continuous some frames are all motion, judge that present frame is motion frame if continuous some frames all move.
For reaching another object of the present invention, the detection method of motion frame in a kind of video acquisition transmission system of the present invention, it comprises:
The video data that gathers is carried out the Video coding compression;
Obtain the information in the video data compression code stream after compression coding;
Coding mode according to the present frame in the aforementioned information of obtaining judges whether present frame moves, if present frame is intra-frame encoding mode, judge that present frame is motion, if present frame is interframe encoding mode, judge further whether each piece in present frame moves, if there be any to be motion, judge that present frame is motion;
Judge that whether continuous some frames are all motion, judge that present frame is motion frame if continuous some frames are motion.
Foreground detection method of the present invention and device take full advantage of the information such as piece based encode pattern, piece base motion vector and DC component of the compressed bit stream of encoder, judge by these information whether a frame moves, can whether move according to the packed data judgement of a frame, the needs view data still less of and background subtraction poorer than frame, computing is simple.
[description of drawings]
Fig. 1 is the structured flowchart of video acquisition transmission system according to an embodiment of the invention.
Fig. 2 is the flow chart of foreground detection method according to an embodiment of the invention.
Fig. 3 is the workflow block diagram of motion detection unit according to an embodiment of the invention.
[embodiment]
Detailed description of the present invention is mainly come the running of direct or indirect simulation technical solution of the present invention by program, step, logical block, process or other symbolistic descriptions.Be the thorough the present invention that understands, stated a lot of specific detail in ensuing description.And when there is no these specific detail, the present invention may still can realize.Affiliated those of skill in the art use herein these descriptions and statement effectively to introduce their work essence to the others skilled in the art in affiliated field.In other words, be the purpose of the present invention of avoiding confusion, due to the method for knowing and easily understanding of program, so they are not described in detail.
Alleged " embodiment " or " embodiment " refer to be contained in special characteristic, structure or the characteristic at least one implementation of the present invention herein.Different local in this manual " in one embodiment " that occur not are all to refer to same embodiment, neither be independent or the embodiment mutually exclusive with other embodiment optionally.In addition, the sequence of unit in method, flow chart or the functional block diagram of the one or more embodiment of expression also revocablely refers to any particular order, also is not construed as limiting the invention.
See also shown in Figure 1ly, it shows the structured flowchart of video acquisition transmission system according to an embodiment of the invention.As shown in Figure 1, video acquisition transmission system of the present invention comprise the video acquisition unit that gathers video image, to the video image of video acquisition unit collection carry out compression coding video compression unit, foreground detection unit, detect information transmission unit and Video Transmission Unit.
Wherein video acquisition unit can be the front end image collecting device of a supervisory control system, and for example monitoring camera, can be also the external camera of desktop computer or the first-class device with video acquisition function of the shooting in notebook computer.
The video compression unit can be a video encoder, and the coding video data that video acquisition unit is gathered compresses.An encoder, it generally includes: utilizes the discrete cosine transformer that on the space, redundancy is come compression data, utilizes temporal redundancy to come dynamic estimator and the dynamic compensator of compression data, and variable length coder etc.Through the video compression data after video encoder encodes, the coding mode that it can comprise usually to each frame picture is for example intraframe coding, or interframe encode, and motion vector, DC component coefficient etc. the relevant parameter of different masses base in each frame.Theory and structure the present invention about video encoder explains no longer in detail.
According to one embodiment of the invention, described foreground detection unit comprises information extraction unit, motion detection unit and alarm decision unit.
Described information extraction unit is responsible for resolving the information through in the code stream of compression coding, obtain the relevant information in compressed bit stream, the compressed encoding pattern that mainly comprises the piece base of each frame of video data and each frame, it is for example frame in frame, or inter-frame, the motion vector of the piece base in each frame and the DC component coefficient of each piece base.
Motion detection unit judges according to the information of each frame that information extraction unit is obtained whether each frame picture is motion, if for motion represent that in picture, there are objects moving, i.e. so-called prospect.
When motion detection unit sends the information of judgement to an alarm decision unit, can be judged whether to report to the police according to the alarm region of setting and the moving region that detects by the alarm decision unit.Just report to the police when there are objects moving in secret places such as the monitoring shop that has or bank.
Motion detection unit can send to monitor terminal by detecting information transmission unit together with the movable information that detects and the information that needs to report to the police.Certainly, in other embodiments, the alarm decision unit can be set also, cross the detection information transmission unit and be transferred to monitor terminal and only will detect information exchange.
As shown in Figure 1, in one embodiment, the workflow of video acquisition transmission system of the present invention is, after video acquisition unit gathers video data, the video compression unit carries out compression coding to the video image of video acquisition unit collection, can directly be transferred to the terminal that need to watch described video image by Video Transmission Unit through the video image of compression coding.
And in another embodiment, can directly transmit video through compression coding by Video Transmission Unit except aforementioned, if need to directly carry out foreground detection to the video data that gathers, judge whether object of which movement is arranged in monitored picture, can with through the video data of overcompression by the foreground detection unit, carry out foreground detection, and by detecting information transmission unit, terminal is sent detection information.
See also shown in Figure 2ly, it shows the workflow diagram of video acquisition transmission system of the present invention.As shown in Figure 2, video acquisition transmission system of the present invention, it comprises the steps:
Step 21: video acquisition unit gathers video.
Step 22: the coding video data compression that the video compression unit gathers video acquisition unit, video data through compression coding, the motion vector that wherein comprises each piece base in the coding mode, each frame of each piece base in each frame picture and each frame, the DC component coefficient of each piece base.
Step 23: the information extraction unit of foreground detection unit is resolved the relevant information in the compressed bit stream of video compression unit output, the motion vector that mainly comprises each piece base in the coding mode that obtains each piece base in each frame picture and each frame, each frame, the DC component coefficient of each piece base.
Step 24: the motion detection unit of foreground detection unit detects and judges whether present frame is motion frame.
See also shown in Figure 3ly, wherein step 24 further comprises again:
Step 241: the coding mode of each frame picture that motion detection unit is obtained according to information extraction unit, judge whether present frame moves, if present frame is frame in frame, judge that present frame is motion frame.The judgement present frame is in frame after frame, change step 246 pair present frame over to and carry out time smoothing filtering, judge namely whether continuous N (N 〉=2 usually) frame is all motion, if continuous N frame is all motion, judges that motion has occured the object in these frames really.If present frame is inter-frame carries out next step judgement.
For inter-frame, the image size according to present frame is divided into some with present frame, and according to different coded systems, block size may be different, and piece is the macro block of 16*16 usually.Set the matrix of N*N as the Output rusults matrix, wherein each piece in the numerical value correspondence image of the point of each in matrix.The initial value of each point in matrix of consequence is 0, when one of them piece for motion time in matrix of consequence the numerical marker to point that should piece be 1, represent that this piece is moving mass.
Step 242: the coding mode of each piece of the present frame that obtains according to information extraction unit judges whether present frame is motion frame.The coding mode of each piece of the present frame that motion detection unit is obtained according to information extraction unit judges, if a certain of present frame is the interior piece of frame of intra-frame encoding mode, judge that current this piece is moving mass, correspondingly will represent in the matrix of this frame point that should piece is denoted as 1.Then can carry out smothing filtering to matrix of consequence.If a certain is the interframe block of interframe encode can further further judges by following step 243 or 244.
Step 243: the reference block according to the interframe block of present frame judges whether present frame is motion frame.Motion detection unit is obtained the current block base in the position of piece base corresponding to former frame (can be called reference block) according to current location and the motion vector of the interframe block in present frame, then check that the position of reference block in the matrix of consequence of previous frame is 1 or 0, if 1 expression reference block is moving mass, judge also that piece corresponding with described reference block in present frame is moving mass in previous frame.Then matrix of consequence is carried out smothing filtering.
Step 244: the motion vector according to the interframe block of present frame judges whether present frame is motion frame.Motion detection unit according to the motion vector of the interframe block in present frame ask for current block move distance MV=(| MV
X|+| MV
Y|), preset the threshold values of move distance, if the move distance of the current block base of obtaining surpasses the threshold values of described move distance, judge that the current block base is moving mass.If the move distance of obtaining is less than predefined move distance threshold values, can further set the threshold values of a piece base DC component, if the DC component of current block judges that greater than the DC component threshold values of setting current block is moving mass, then carries out smothing filtering to matrix of consequence.
The judgement current block is when being interframe block in abovementioned steps 242, follow-up selection step 243 or 244 steps all can or execution in step 243,244 is also passable simultaneously.
Step 245: the result of abovementioned steps 242,243,244 judgements is input in the matrix of consequence of present frame, if comprise 1 in matrix of consequence, represents that present frame is motion frame.
Step 246: video data is carried out time smoothing filtering, judge namely whether continuous N (N 〉=2 usually) frame is all motion, if continuous N frame is all motion, judge that these frames are motion frame really.
Step 25: whether the alarm decision unit moves according to the present frame of motion detection unit judgement, and judges whether to report to the police according to the alarm region of setting, if need to report to the police, produces alarm signal.
Step 26: send detection information and the warning message of foreground detection unit generation to follow-up unit by detecting information transmission unit.
Be more than to judge whether a frame picture is the step of motion frame, wherein, judge aforementioned the step whether a frame picture move, for inter-frame, be set with the Output rusults matrix, wherein each piece in the numerical value correspondence image of the point of each in matrix.The initial value of each point in matrix of consequence is 0, when one of them piece for motion time in matrix of consequence the numerical marker to point that should piece be 1, represent that this piece is moving mass.When doing foreground detection, can be according to the Data Detection of described matrix, in matrix, numerical value is that the image of 1 some correspondence is prospect.
In the aforementioned embodiment, numerical value 1 expression in the Output rusults matrix is motion, and the 0 non-motion of expression certainly in other embodiments, also can represent motion with other non-zero values, and the 0 non-motion of expression.
Foreground detection of the present invention unit can be applied to the headend equipment for video acquisition and compression, also can be used for the backstage video code flow that receives is analyzed.
Foreground detection method of the present invention and device take full advantage of the information such as piece based encode pattern, piece base motion vector and DC component of the compressed bit stream of encoder, judge by these information whether a frame moves, can whether move according to the packed data judgement of a frame, the needs view data still less of and background subtraction poorer than frame, computing is simple, therefore can be applied in the headend equipment of video acquisition and compression.
Above-mentioned explanation has fully disclosed the specific embodiment of the present invention.It is pointed out that being familiar with any change that the person skilled in art does the specific embodiment of the present invention does not all break away from the scope of claims of the present invention.Correspondingly, the scope of claim of the present invention also is not limited only to previous embodiment.
Claims (10)
1. the method for foreground detection in a video acquisition transmission system, it comprises:
The video data that gathers is carried out the Video coding compression;
Obtain the information in the video data compression code stream after compression coding;
Set according to the coding mode of the present frame in the aforementioned information of obtaining, if present frame is interframe encoding mode, set the Output rusults matrix of present frame, wherein matrix each the point corresponding present frame each piece, further judge whether each piece in present frame moves, be when motion when described, change the numerical value to point that should piece in described matrix of consequence into non-zero values, otherwise be zero; With
Export described matrix of consequence, image corresponding to piece corresponding to the non-zero values in described matrix of consequence is prospect,
The described information of obtaining comprises the coding mode of frame of video and piece, describedly further judges whether each in present frame piece moves and comprises: the coding mode according to each piece that obtains judges whether each piece moves, if in frame piece described be moving mass.
2. the method for claim 1, it is characterized in that: the described information of obtaining comprises the motion vector of piece, describedly further judge whether each in present frame piece moves and comprise: according to described of the motion vector of certain piece that obtains and described position acquisition at current matrix in the position of reference block in the previous frame matrix corresponding to former frame, check whether reference block moves, if reference block is motion, current block is motion.
3. the method for claim 1, it is characterized in that: the described information of obtaining comprises motion vector and the DC component of piece, describedly further judges whether each in present frame piece moves and comprises: the move distance of asking for piece according to the motion vector of the piece that obtains; Move distance is carried out Threshold segmentation, surpass the moving mass that is judged as of threshold value; For move distance less than the further value that judges DC component of threshold value whether greater than predetermined threshold value, if greater than described be moving mass.
4. the method for claim 1, it further is included in each piece of judgement for after motion, described matrix of consequence being carried out smothing filtering.
5. the foreground detection device in a video acquisition transmission system, wherein said video acquisition transmission system comprises the video acquisition unit that gathers video, the video data of video acquisition unit collection is carried out to the Video coding compression unit of Video coding compression, it is characterized in that: described foreground detection device comprises the foreground detection unit that the video data after compression is carried out to foreground detection, described foreground detection unit comprises information extraction unit and motion detection unit, the information extraction unit of described foreground detection unit is obtained the information in the video data compression code stream after compression coding, the motion detection unit of foreground detection unit is set according to the coding mode of the present frame that information extraction unit is obtained, if interframe encoding mode, set the Output rusults matrix of present frame, wherein matrix each the point corresponding present frame each piece, further judge whether each piece in present frame moves, when piece is motion, change the numerical value to point that should piece in described matrix of consequence into non-zero values, otherwise be zero, in described matrix of consequence, data are that image corresponding to piece corresponding to non-zero values is prospect
The information that described foreground detection unit obtains comprises the coding mode of frame of video and piece, described motion detection unit judges according to the coding mode of each piece that information extraction unit is obtained whether each piece moves, if described be intra-frame encoding mode described for moving mass.
6. foreground detection device as claimed in claim 5, it is characterized in that: the information that described foreground detection unit obtains comprises the motion vector of described, described motion detection unit is obtained described in the position of reference block in the previous frame matrix corresponding to former frame according to position and the motion vector at current matrix of certain piece that information extraction unit is obtained, check whether reference block moves, if reference block is motion, current block is motion.
7. foreground detection device as claimed in claim 5, it is characterized in that: the information that described foreground detection unit obtains comprises motion vector and the DC component of piece, and the motion vector of the piece that described motion detection unit is obtained according to information extraction unit is asked for the move distance of piece; Move distance is carried out Threshold segmentation, surpass the moving mass that is judged as of threshold value; For move distance less than the further value that judges DC component of threshold value whether greater than predetermined threshold value, if greater than described be moving mass.
8. foreground detection device as claimed in claim 5 is characterized in that: further comprise in the foreground detection unit alarm decision unit judging whether to report to the police in order to the moving region that detects according to the alarm region of setting and motion detection unit.
9. the motion frame checkout gear in a video acquisition transmission system, wherein said video acquisition transmission system comprises the video acquisition unit that gathers video, the video data of video acquisition unit collection is carried out the Video coding compression unit of Video coding compression, it is characterized in that: described motion frame checkout gear comprises the foreground detection unit that the video data after compression is carried out foreground detection, described foreground detection unit comprises information extraction unit and motion detection unit, the information extraction unit of described foreground detection unit is obtained the information in video data compression code stream after compression coding, the video data encoding information that the motion detection unit of foreground detection unit is obtained according to information extraction unit judges whether present frame moves, wherein the coding mode of the present frame that obtains according to information extraction unit of motion detection unit judges whether present frame moves, if being intra-frame encoding mode, present frame judges that present frame is motion, if present frame is interframe encoding mode, whether each piece that further judges present frame moves, if there be any to be motion, described frame is motion, motion detection unit judges that whether continuous some frames are all motion, judge that present frame is motion frame if continuous some frames all move.
10. the detection method of motion frame in a video acquisition transmission system, it comprises:
The video data that gathers is carried out the Video coding compression;
Obtain the information in the video data compression code stream after compression coding;
Coding mode according to the present frame in the aforementioned information of obtaining judges whether present frame moves, if present frame is intra-frame encoding mode, judge that present frame is motion, if present frame is interframe encoding mode, judge further whether each piece in present frame moves, if there be any to be motion, judge that present frame is motion;
Judge that whether continuous some frames are all motion, judge that present frame is motion frame if continuous some frames are motion.
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| CN106023346B (en) * | 2016-07-06 | 2018-08-14 | 福州瑞芯微电子股份有限公司 | Dynamic frame per second vehicle-running recording system and car speed judgment means |
| CN112969078B (en) * | 2021-03-23 | 2023-02-28 | 统信软件技术有限公司 | Bullet screen anti-blocking method in video, computing equipment and readable storage medium |
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| WO2007036873A2 (en) * | 2005-09-27 | 2007-04-05 | Koninklijke Philips Electronics N.V. | Motion detection device |
| WO2007044672A2 (en) * | 2005-10-05 | 2007-04-19 | Qualcomm Incorporated | Video frame motion-based automatic region-of-interest detection |
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