CN103376950B - Image position method and use the interaction image system of described method - Google Patents
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Abstract
A kind of image position method, this image position method comprises the steps of use imageing sensor and obtains picture frame; Identify at least one subject image in described picture frame; Compare subject image size and the dimension threshold of described subject image, and the subject image that described subject image is sized larger than described dimension threshold is identified as reference point image; And position described reference point image. The present invention also provides for a kind of interaction image system.
Description
Technical field
The present invention relates to a kind of pointing system, particularly to a kind of image position method and the interaction image system using described method.
Background technology
Interactive picture system generally utilizes imageing sensor to continuously acquire the multiple picture frames including at least one reference point image, and correspondingly control electronic installation according to described reference point image according to the change in location of described image interframe, for instance control the action of cursor on display picture. In order to correctly described cursor is controlled it may first have to can correctly position described reference point image in described picture frame.
Such as U.S. Patent No. 7,796, No. 116, title is " electronic installation (electronicequipmentforhandheldvisionbasedabsolutepointin gsystem) for the absolute pointing system according to hand-held vision " open a kind of image position method; Shown in Figure 1A, described image position method comprises the steps of determines the intensity level of each pixel in picture frame 9; Determine the rectangular extent 92 comprising reference point image 91; Judge the multiple valid pixels higher than predetermined threshold value in described rectangular extent 92; And the coordinate of described reference point image 91 is determined according to the described intensity level of each valid pixel and location of pixels.
It is well known, however, that in image position method, assume that the interference brightness in described picture frame 9 is not above the premise of described predetermined threshold value and gets off the location that carries out described reference point image 91. But, actually when described rectangular extent 92 exists interference, it is possible to the described intensity level of partial pixel can be made higher than described predetermined threshold value, for instance the pixel 921 in Figure 1B. Now, if calculate the coordinate of described reference point image 91 according to known image localization method, in fact it could happen that the situation of coordinate offset.
Additionally, in the scope of described reference point image 91, it is also possible to there is the described intensity level disturbing and making partial pixel lower than described predetermined threshold value, for instance the pixel 911 in Figure 1B. Now, if during according to the coordinate of known image localization method calculating reference point image 91, it is equally possible to the situation of coordinate offset occurs. If the coordinate of calculated reference point image 91 is incorrect, will cause that the situation by mistake controlled occurs.
In consideration of it, the present invention also proposes a kind of image position method and uses the interaction image system of described method, its can effectively exclusive PCR to increase setting accuracy and stability.
Summary of the invention
It is an object of the invention to provide a kind of image position method and use the interaction image system of described method, it with whether dimension threshold and identification reference point image are hollow image, uses exclusive PCR and the interference of environment light by comparative volume image.
The present invention provides a kind of image position method, comprises the steps of use imageing sensor and obtains picture frame; Use at least one subject image in picture frame described in processing unit identification; Use subject image size and the dimension threshold of the more described subject image of described processing unit, and the described subject image that described subject image is sized larger than described dimension threshold is identified as reference point image; And use described processing unit to position described reference point image.
The present invention also provides for a kind of interaction image system, comprises electronic installation and remote controller. Described electronic installation comprises at least one reference point and receives unit, and wherein said reception unit is used for receiving control signal. Described remote controller comprises imageing sensor, processing unit and transmitter unit. Described imageing sensor is for continuously acquiring the multiple picture frames comprising at least one subject image. Described processing unit, for identifying the described subject image in described picture frame, corresponds to the reference point image of described reference point according to the subject image Dimensions recognition of described subject image and positions described reference point image. Described transmitter unit is control signal according to the delivering of described reference point image.
The present invention also provides for a kind of interaction image system, comprises display device and remote controller. Described display device comprises at least one reference point and sends the light of default spectrum. Described remote controller continuously acquire comprise at least one subject image multiple picture frames, according to the subject image Dimensions recognition of described subject image corresponding to described reference point reference point image, position described reference point image and the change in location according to described reference point image correspondingly controls described display device.
The image position method of embodiment of the present invention and use the interaction image system of described method, described luminance threshold can be fixed value or variation value; Wherein, described fixed value can set in advance, and the mean flow rate that described variation value can be a picture frame is multiplied by ratio, and described ratio is decided by described picture frame the variance of the brightness value of each pixel.
The image position method of embodiment of the present invention and use the interaction image system of described method, described dimension threshold can be fixed value or variation value; Wherein, described fixed value can set in advance, and described variation value can be that described in a picture frame, the average-size of reference point image is multiplied by ratio, the variance of the size that described ratio is decided by described picture frame each reference point image.
The image position method of embodiment of the present invention and use the interaction image system of described method, by picture frame, brightness value is identified as subject image more than luminance threshold pixel or multiple neighbor; The subject image meeting subject image dimensional requirement is identified as reference point image; And calculate the center of gravity of described reference point image or center to carry out the location of described reference point image according to the brightness value of each pixel of reference point image and location of pixels.
Accompanying drawing explanation
Figure 1A and 1B illustrates the schematic diagram of known image localization method.
Fig. 2 illustrates the schematic diagram of the interaction image system of embodiment of the present invention.
Fig. 3 illustrates the flow chart of the image position method of embodiment of the present invention.
Fig. 4 illustrates in the image position method of embodiment of the present invention, the schematic diagram of picture frame and subject image.
Fig. 5 illustrates in the image position method of embodiment of the present invention, another schematic diagram of picture frame and subject image.
Fig. 6 illustrates in the image position method of embodiment of the present invention, another schematic diagram of picture frame and subject image.
Description of reference numerals
10 electronic installation 11 reference points
12 receive unit 13 shows picture
131 cursor 20 remote controllers
21 imageing sensor 22 processing units
23 transmitter unit 4 picture frames
41 reference point images 410,42 disturb pixel
411-414 image section 411a, 412a image section starting point
411b, 412b image section terminal S31-S34Step
9 picture frame 91 reference point images
92 rectangular extent 911,921 pixels
S control signal
Detailed description of the invention
In order to the above and other purpose of the present invention, feature and advantage can be become apparent from, hereafter will coordinate accompanying drawing, elaborate. In the explanation of the present invention, identical component represents with identical symbol, first illustrates at this.
With reference to shown in Fig. 2, it illustrates the schematic diagram of interaction image system of embodiment of the present invention. Described interaction image system comprises electronic installation 10 and remote controller 20. Described remote controller 20 for continuously acquire comprise at least one subject image multiple picture frames, according to the subject image Dimensions recognition of described subject image corresponding at least one reference point reference point image, position described reference point image and position and/or change in location according to described reference point image correspondingly control described electronic installation 10, such as control the action of cursor on described electronic installation 10 or performed software, but be not limited to this. During the present invention illustrates, described subject image refers to that, not yet through the subject image of Dimensions recognition, therefore subject image is likely reference point image, ambient-light images or interference; Described reference point image refers to meet the subject image of pre-set dimension scope.
Described electronic installation 10 comprises at least one reference point 11 (being shown here as two reference points) and receives unit 12. Described reference point 11 can be such as light emitting diode or laser diode, for sending the light of default spectrum, it is preferable that send HONGGUANG, infrared light or other black lights. Described reception unit 12 is for wire or wirelessly coupling described remote controller 20, for receiving the control signal S that described remote controller 20 is sent; Such as, when described electronic installation 10 is the display device with display picture 13, described display picture 13 can manipulate for described remote controller 20 by display highlighting 131; Wherein, remote controller controls the mode of electronic installation for it is known that the spirit of the present invention is in that the coordinate of correct location reference point image. Additionally, wired and Radio Transmission Technology is not for it is known that therefore repeat in this. In other embodiments, described reference point 11 is independently of outside described electronic installation 10.
Described remote controller 20 comprises imageing sensor 21, processing unit 22 and transmitter unit 23. Described imageing sensor 21 can be such as COMS imageing sensor, ccd image sensor or other are for the sensor of sense light energy, for continuously acquiring and export the multiple picture frames comprising at least one subject image, wherein said picture frame can be analogy image or digital image. Such as, when described imageing sensor 21 output digit image, such as can comprise analog/digital converting unit (ADC) in described imageing sensor 21 for analog signal is converted to digital signals. Described processing unit 22 can be digital signal processor (DSP), for receiving picture frame that described imageing sensor 21 exports and carrying out post processing, including the subject image identified in described picture frame, correspond to the reference point image of at least one reference point according to the subject image size of described subject image and/or subject image shape recognition and position described reference point image. Finally, the information (such as change in location) of described processing unit 22 reference point image according to consecutive image interframe wire or wirelessly sends control signal S to described electronic installation 10 correspondingly to control by described transmitter unit 23. When described imageing sensor 21 output class is than image, described processing unit 22 such as comprises analog/digital converting unit for analog signal is converted to digital signals. In other words, described processing unit 22 carrys out location reference point image according to digital image.
In detail, in embodiment of the present invention, described remote controller 20 prior size and shape according to subject image before positioning distinguishes reference point image and interference, to increase setting accuracy and operational stability.
It will be appreciated that described remote controller 20 generally comprises buffer (not shown) for the data in temporary calculating process and parameter, wherein said buffer can comprise or be not included in described processing unit 22.
With reference to shown in Fig. 3, it illustrates the flow chart of image position method of embodiment of the present invention, comprises the steps of use imageing sensor and obtains picture frame (step S31); Use at least one subject image (the step S in picture frame described in processing unit identification32); Use subject image size and the dimension threshold of the more described subject image of described processing unit, and the described subject image that described subject image is sized larger than described dimension threshold is identified as reference point image (step S33); And use described processing unit to position described reference point image (step S34). After completing the location of reference point image described in multiple picture frame, according to the position of described reference point image and/or change in location, control signal S extremely described electronic installation 10 can be exported by described transmitter unit 23. The embodiment of the image position method of present embodiment illustrates as follows:
Step S31: the imageing sensor 21 of described remote controller 20 continuously acquires picture frame with sampling frequency and is sent to described processing unit 22.
Step S32: the processing unit 22 of described remote controller 20 is by described picture frame, and brightness value is identified as subject image more than luminance threshold pixel or multiple neighbor (person of being interconnected with one another). In present embodiment, described processing unit 22 such as can according to subject image described in two kinds of embodiment identifications.
In a kind of embodiment, one whole picture frame can be stored to buffer by described processing unit 33 in advance. Then, described processing unit 33 by the brightness value of this each pixel of picture frame compared with at least one luminance threshold; When each pixel brightness value of a certain pixel region (can comprise one or more pixel) is more than described luminance threshold, described pixel region is identified as subject image, and adjacent and brightness value are identified to belong to same subject image more than multiple pixels of described luminance threshold. It will be appreciated that described picture frame is likely to have partial pixel region to cause because of interference being identified as subject image. Described luminance threshold can be such as the preset ratio that can represent grey-scale range, for instance when brightness can 256 GTGs represent time, described luminance threshold can be such as 0.5 �� 256; Wherein, described preset ratio can be determined according to identification demand.
In another embodiment, described processing unit 33 receives the pixel information of each pixel one by one, and namely compares described pixel information and at least one luminance threshold while receiving described pixel information. When the brightness value of described pixel information is more than described luminance threshold, it is identified as valid pixel and is stored in buffer, then sequentially identifying the pixel information of next pixel again; This embodiment can reduce the use space of buffer.
Shown in Fig. 4, it is assumed that in picture frame 4, described processing unit 22 arranges the 1st pixel from the 1st and starts sequentially to read line by line each pixel. The such as brightness value of pixel coordinate (3,1) is more than described luminance threshold, and described processing unit 22 then records the starting point coordinate 411a of image section 411 in buffer; Then, record with the information (such as including pixel coordinate and grey decision-making) of each pixel in the described starting point coordinate 411a described image section 411 being starting point and is stored in buffer; Then, for instance the brightness value of pixel coordinate (7,1) is less than described luminance threshold, and described processing unit 22 then records the terminal point coordinate 411b of described image section 411 in buffer, and completes the recognizer of first row. If it will be appreciated that first row exists another image section, then can identify and record the information of each pixel of another image section described in the same manner.
Then, can identify and record the starting point coordinate 412a of secondary series, image section 412 and terminal point coordinate 412b respectively with same program. Then, if meeting following formula, judge that described image section 411 and 412 belongs to same object image,
Seg_L��Preline_Obji_ R; And
Seg_R��Preline-Obji_ L;
Wherein, for instance when reading the Y row of picture frame 4; Seg_L represents the starting point coordinate of image section (such as 412) left of unknown object image in Y row; Seg_R represents the terminal point coordinate of the image section right of unknown object image in Y row; Preline-Obji_ L represents the left starting point coordinate of the image section (such as 411) of subject image i in Y-1 row; Preline-Obji_ R represents the right terminal point coordinate of the image section of subject image i in Y-1 row. In other words, adjacent and brightness value are identified to belong to same subject image more than multiple pixels of described luminance threshold. Then, it is possible to by same program identification the object image information recording other row. The detailed embodiment of present embodiment such as can refer to the U.S. Patent Publication the US2006/0245649th by this case common assignee application and US2006/0245652 disclosure of that. Similarly, described picture frame 4 has been likely to partial pixel region to cause because of interference being identified as subject image.
After this step completes, the processing unit 22 of described remote controller 20 then may recognize that at least one subject image with given shape; Wherein, described given shape is different according to the recognition methods used, for instance be likely rectangle or irregular shape.
Step S33: the processing unit 22 comparison step S of described remote controller 2032Middle identified subject image and dimension threshold (or size range), use elimination interference and ambient light interference. Such as, described subject image can be sized larger than the subject image of dimension threshold be identified as reference point image and described subject image is smaller in size than the subject image of described dimension threshold is identified as interference. Shown in Fig. 5, identified subject image 41 and the subject image 42 of including in described picture frame 4, described subject image 42 makes the brightness value of its pixel more than described luminance threshold owing to being interfered. In present embodiment, for instance, but be not limited to, described dimension threshold can be set to 3 pixels, therefore when subject image is less than 3 pixels, be judged as interference and get rid of, therefore the subject image 42 in Fig. 5 will be excluded when positioning. In addition, when subject image is more than preset area, then can be judged as ambient light interference and be excluded equally, wherein said preset area such as can be determined according to the operating distance of the size of described reference point 11 and described remote controller 20 and described electronic installation 20, for instance can be stored in advance apart from corresponding reference point size by different operating. In addition, after identifying reference point image, the processing unit 22 of described remote controller 20 and then can identify whether described reference point image meets preset shape (such as here for circle), what do not meet described preset shape then can be considered as in environment the image of other objects, uses the interference getting rid of environment light.
Step S34: the processing unit 22 of described remote controller 20 calculates the center of gravity of described reference point image or the center coordinate as described reference point image to position. Such as, center of gravity or the center of described reference point image is calculated according to the brightness value of the described at least some of pixel of reference point image and location of pixels.
Finally, result of calculation is sent to described electronic installation 10 by described transmitter unit 23 by the processing unit 22 of described remote controller 20.
In another embodiment, the processing unit 22 of described remote controller 20 also performs to identify the step whether reference point image is hollow image, to avoid the interference of reference point image range endogenous cause of ill to cause that the brightness value of partial pixel is excluded in position fixing process lower than described luminance threshold; Namely, the processing unit 22 of described remote controller 20 identifies that the brightness value whether having pixel in described reference point image range is less than described luminance threshold, and judges whether described reference point image is hollow image according to brightness value in described reference point image less than the elemental area of described luminance threshold. Such as with reference to shown in Fig. 6, it is assumed that described processing unit 22 is according to step S33Identify reference point image 41, the brightness value comprising pixel 410 in described reference point image 41 is lower than described luminance threshold (being such as called hollow area), and described processing unit 22 then calculates the area ratio of the elemental area of described hollow area and the entire area of described reference point image 41; When more than area threshold, described area ratio then represents that described hollow area is not caused (namely reference point image belongs to hollow image) by interference, position fixing process will be got rid of brightness value and the location of pixels of each pixel of described hollow area; When less than described area threshold, described area ratio then represents that described hollow area is caused (namely reference point image belongs to solid image) by interference, position fixing process will comprise brightness value and the location of pixels of each pixel of described hollow area. The detailed embodiment of present embodiment can refer to equally by the content of the U.S. Patent Publication the US2006/0245649th of this case common assignee application. Described processing unit 22 is followed by the brightness value of at least some of pixel (can comprise or not comprise hollow area) in reference point image and the center of gravity of location of pixels calculating reference point image or center.
Additionally, in the present invention, described luminance threshold and described dimension threshold may each be the variation value that fixed value maybe can be dynamically adjusted.
Such as, when after the identification completing a picture frame, described processing unit 22 calculates the mean flow rate of all pixels of current picture frame, and described mean flow rate is multiplied by ratio (such as X% �� mean flow rate) is used as the variable luminance threshold of next picture frame; Wherein, X is positive number. Additionally, the numerical value of X also can be finely tuned according to the variance (variance) of each pixel brightness value in whole picture frame; Such as, when described variance is bigger, represent that in this picture frame, the difference of the brightness value of each pixel is bigger, now preferably improves the numerical value of X; Otherwise, when described variance is less, represent that in this picture frame, the difference of the brightness value of each pixel is less, now preferably reduces the numerical value of X; Wherein, fine setting numerical value such as can with described variance positive correlation, with improves identification subject image correctness. In other words, described luminance threshold can be determined according to previous image or the current mean flow rate of image, maximum brightness or minimum brightness, determines described luminance threshold with the brightness according to actual acquired image.
Such as, when after the identification completing a picture frame, described processing unit 22 calculates the average-size of all reference point images in current picture frame, and described average-size is multiplied by ratio (such as Y% �� mean flow rate) is used as the variable dimension threshold of next picture frame; Wherein, Y is positive number. Additionally, the numerical value of Y also can be finely tuned according to the variance of reference point picture size each in whole picture frame; Such as, when described variance is bigger, represent that in this picture frame, the difference of the size of each reference point image is bigger, now preferably improves the numerical value of Y; Otherwise, when described variance is less, represent that in this picture frame, the difference of the size of each reference point image is less, now preferably reduces the numerical value of Y; Wherein, fine setting numerical value such as can with described variance positive correlation, with improves identification reference point image correctness. In other words, described dimension threshold can be determined according to previous image or the current average subject image size of image, largest object picture size or smallest object picture size, to determine described dimension threshold according to subject image size in actual acquired image.
In sum, it is known that image position method is easily subject to interference and may result in the situation that image coordinate offsets. Therefore, the present invention also proposes a kind of image position method (Fig. 3) and uses the interaction image system (Fig. 2) of described method, and it is by comparative volume image and dimension threshold and identifies whether reference point image is that hollow image carrys out exclusive PCR and improves stability.
Although the present invention is open with aforementioned embodiments, so it is not intended to limit the present invention, and any the technical staff in the technical field of the invention, without departing from the spirit and scope of the present invention, can do various variation and amendment. Therefore protection scope of the present invention is with being as the criterion that appending claims defines.
Claims (18)
1. an image position method, this image position method comprises the steps of
Imageing sensor is used to obtain picture frame;
Use at least one subject image in picture frame described in processing unit identification;
Use subject image size and the dimension threshold of the more described subject image of described processing unit, and the described subject image that described subject image is sized larger than described dimension threshold is identified as reference point image; And
Described processing unit is used to position described reference point image.
2. image position method according to claim 1, wherein in the step of at least one subject image in identifying described picture frame, the brightness value in described picture frame is identified as described subject image more than luminance threshold pixel or multiple neighbor by described processing unit.
3. image position method according to claim 2, wherein said luminance threshold is fixed value or variation value; The mean flow rate that described variation value is a described picture frame is multiplied by ratio.
4. image position method according to claim 1, wherein said dimension threshold is fixed value or variation value; Described variation value is that described in a described picture frame, the average-size of reference point image is multiplied by ratio.
5. image position method according to claim 1, this image position method also comprises:
Use whether reference point image described in described processing unit identification is hollow image.
6. image position method according to claim 1, wherein positions in the step of described reference point image, and described processing unit positions according to brightness value and the location of pixels of at least some of pixel of described reference point image.
7. image position method according to claim 1, this image position method also comprises:
Use whether reference point image described in described processing unit identification meets preset shape.
8. an interaction image system, this interaction image system comprises:
Electronic installation, this electronic installation comprises:
At least one reference point; With
Receive unit, be used for receiving control signal; And
Remote controller, this remote controller comprises:
Imageing sensor, for continuously acquiring the multiple picture frames comprising at least one subject image;
Processing unit, for identifying the described subject image in described picture frame, corresponds to the reference point image of described reference point according to the subject image Dimensions recognition of described subject image and positions described reference point image; With
Transmitter unit, control signal according to the delivering of described reference point image,
Described subject image is sized larger than the described subject image of dimension threshold and is identified as described reference point image and described subject image is smaller in size than the described subject image of described dimension threshold is identified as interference by wherein said processing unit.
9. interaction image system according to claim 8, the brightness value in described picture frame is identified as described subject image more than luminance threshold pixel or multiple neighbor by wherein said processing unit.
10. interaction image system according to claim 9, wherein said luminance threshold is fixed value or variation value; The mean flow rate that described variation value is a described picture frame is multiplied by ratio.
11. interaction image system according to claim 8, wherein said dimension threshold is fixed value or variation value; Described variation value is that described in a described picture frame, the average-size of reference point image is multiplied by ratio.
12. interaction image system according to claim 8, wherein said processing unit also identifies whether described reference point image is hollow image.
13. interaction image system according to claim 8, wherein said processing unit positions according to brightness value and the location of pixels of at least some of pixel of described reference point image.
14. interaction image system according to claim 8, wherein said processing unit also identifies whether described reference point image meets preset shape.
15. an interaction image system, this interaction image system comprises:
Display device, this display device comprises at least one reference point, and this at least one reference point sends the light of default spectrum; And
Remote controller, continuously acquire comprise at least one subject image multiple picture frames, according to the subject image Dimensions recognition of described subject image corresponding to described reference point reference point image, position described reference point image and the change in location according to described reference point image correspondingly controls described display device
Described subject image is sized larger than the described subject image of dimension threshold and is identified as described reference point image and described subject image is smaller in size than the described subject image of described dimension threshold is identified as interference by wherein said remote controller.
16. interaction image system according to claim 15, the brightness value in described picture frame is identified as described subject image more than luminance threshold pixel or multiple neighbor by wherein said remote controller.
17. interaction image system according to claim 15, wherein said remote controller also identifies that the brightness value whether having pixel in described reference point image is less than luminance threshold.
18. interaction image system according to claim 17, less than the elemental area of described luminance threshold, wherein said remote controller brightness value according to described reference point image judges whether described reference point image is hollow image.
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