CN103529927A - Background updating method suitable for image processing - Google Patents
Background updating method suitable for image processing Download PDFInfo
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- CN103529927A CN103529927A CN201210233843.7A CN201210233843A CN103529927A CN 103529927 A CN103529927 A CN 103529927A CN 201210233843 A CN201210233843 A CN 201210233843A CN 103529927 A CN103529927 A CN 103529927A
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Abstract
The invention relates to a background updating method suitable for image processing. The background updating method is a mechanism which can dynamically adjust the updating degree of background images. Due to changes of the images such as the changes of brightness, the changes of displacement and the changes of colors, the degree of the background updating is changed, and the accuracy rate of image resolution of a foreground and a background is improved.
Description
Technical field
The present invention relates to a kind of renewal background method of image processing, furthermore, capable of dynamic of the present invention is adjusted the background video mechanism of update time.By the variation of image, such as bright dark variation, change in displacement, change color etc., change the time of upgrading background, improve thus the accuracy rate that prospect and background video are differentiated.
Background technology
Existing image sensing chip utilizes active light source polishing to object, for example pointer or finger etc., then by an image sensor, capture reflected light, make the chip can be according to reflected light, produce a reverberation event data, it can represent that object is with respect to centre of gravity place and the brightness of image sensing chip.Thus, can be in order to judge the gesture, dynamic etc. of object.Therefore,, when background video and reflected light are difficult to differentiate, may cause the error of judgement.
For example, when user wears the clothes that reflection coefficient is higher, and can enter the field range of image sensing chip time, can on image sensor, form a brighter and motionless background video.So, when user starts to brandish palm and controls, the reflected image of the fingers/hand palm just may be too little with respect to the luminance difference of background video and have influence on the result of gesture judgement.
Therefore, the present invention proposes a kind ofly can consider that user uses situation, to upgrade the method for background, can make the judgement that image sensing chip can be based on to user's behavior, changes the time of upgrading background, the accuracy rate of raising prospect and background video resolution.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art and defect, propose a renewal background method that is applicable to image processing, in order to the behavior according to user, make a decision, slow down the degree of upgrading background, the accuracy rate of raising prospect and background video resolution.Slowing down the degree of upgrading background can utilize to extend and upgrade the weight that time of background or minimizing be used for upgrading the new data of background and reach.
In order to reach this object, the invention provides a kind of renewal background method of image processing, an image sensing chip that is applicable to include an image sensor, comprises: judge that an object enters the reconnaissance range of this image sensor, wherein this reconnaissance range is a solid space; And slow down the degree of upgrading background, with the accuracy rate of raising prospect and background video resolution.When image sensor senses, newly enter image when larger than the brightness of background video, upgrade the weight that background video or minimizing are used for upgrading the new data of background with the slower time, vice versa.In general operation situation, object (for example palm/finger of user) more approaches image sensor compared with background, therefore its catoptrical intensity can be larger, and draw the brighter image that newly enters, now with slower time, upgrade the weight that background video or minimizing are used for upgrading the new data of background, can there is more consistent background video benchmark so that newly enter image, and can put forward high-resolution accuracy rate.
In order to reach aforementioned object, the another kind of practice is newly entered image representative while having displacement to occur for sensing when image sensor, is used for upgrading the weight of the new data of background with slower time renewal background video or minimizing, and vice versa.In general operation situation, when user wants to carry out gesture operation, can brandish object (for example palm/finger of user) in obvious mode, therefore it newly enters image and can be judged as and include displacement information, now just can upgrade the weight that background video or minimizing are used for upgrading the new data of background with the slower time.
In order to reach aforementioned object, also have a kind of practice for sensing while newly entering the object that includes its default object external form condition in image when image sensor, with slower time renewal background video or minimizing, be used for upgrading the weight of the new data of background, vice versa.In general operation situation, image sensor can sensing spatial dimension in, its predeterminable identification object, palm/finger of user for example, general adult's palm adds that finger size is about twenties centimeters of circumference left and right, and color is pale to pitch-dark (the corresponding colour of skin from white man to Black people).Image sensing chip can utilize the external form conditions such as color, size to make a decision, and when newly entering image, is judged as while including this type of object, just can upgrade the weight that background video or minimizing are used for upgrading the new data of background with the slower time.
The aforementioned method that is used for slowing down the degree of upgrading background, can be used alone or as a mixture, to promote effect of the present invention.
Accompanying drawing explanation
Fig. 1 a and Fig. 1 b are the schematic diagram that newly enters image and background video renewal of the present invention;
Fig. 2 illustrates one embodiment of the invention;
Fig. 3 is another embodiment of the present invention;
Fig. 4 is another embodiment of the present invention.
Symbol description in figure
11 newly enter image
21 mean flow rates
31 pixels 31
41 standard deviations are interval
211,213,215,217,219,311,313,315,411,413,415 images
The T0-T8 time
Embodiment
Following embodiment is in order to illustrate technology contents of the present invention, not in order to limit the scope of the invention.It should be noted that, in following examples and accompanying drawing, element unrelated to the invention has omitted and has not illustrated, and in accompanying drawing, each interelement size relationship is only for asking easy understanding, non-in order to limit actual ratio.
Fig. 1 a and Fig. 1 b are the schematic diagram that newly enters image and background video renewal of the present invention.It illustrates when object is by image sensor sensing, and causes when newly entering image 11 and having the pixel 31 of higher bright spot, how to be suitable for schematic diagram of the present invention.In the present embodiment, newly enter image 11 and have 4 * 3 totally 12 pixels, wherein pixel 31 has higher bright spot.Fig. 1 b can be that the brightness that pixel 31 presents on time shaft changes, and wherein T8 is for newly entering the brightness in image, and T0 is that previous brightness changes to T7.This figure only, for ease of explanation the present invention's use, in fact, in order to the image sensor of sensing image, often has more number of pixels, for example, have the image sensor of 30 * 30 pixels.
According to T0, to T7, can calculate pixel 31 and there is a mean flow rate 21, and a standard deviation interval 41.Can find out the time at T8, the brightness of pixel 31 has surpassed standard deviation interval 41 and has presented high brightness state, now represents that object starts to enter the sensing range of image sensor, and make newly to enter image 11, starts to comprise high luminance pixel.In the present embodiment, suppose newly to enter image 11 and can be used as one of composition upgrading background video.
Generally speaking, the practice of renewal background video has the difference that progression formula is upgraded and individual image upgrades.The former can consider previous image data, renewal background video progressively; Latter is directly to capture a certain image, as a setting image.The applicable object of the present invention is the method that progression formula is upgraded.
In the present embodiment, suppose at T8 before the time, the background video of pixel 31 is for having mean flow rate 21 and standard deviation interval 41, when the image when time T8 has higher brightness, the degree of upgrading in order to delay background video, can reduce the weight of T8 time image, or extend the time gap that background video upgrades, can skip in the present embodiment the image of T8 time not in order to upgrade background video.
Further illustrate, the degree of upgrading in order to delay background video, can lower pixel intensity and surpass mean flow rate 21 or be above standard poor interval 41 weight.For example, when upgrading background video, the pixel intensity of T8 time can only give 1/8, or 1/16 equal weight, makes former background video can occupy 7/8 or 15/16 equal weight, with this, reduces high luminance pixel image for the influence degree of background video.
Or when high luminance pixel image occurs, can extend the time that background video upgrades.With the present embodiment, before time T 8, each image is all used as the reference that background video upgrades, and when high luminance pixel image appears in time T 8, can be extended for three times of time intervals or ten times of time intervals just to capture the reference that image upgrades as a setting of an image.
Certainly, aforesaid method also can be mixed use, that is when high luminance pixel image appears in time T 8, has both extended the time that background video upgrades, and reduces again pixel image for the weight of background video impact.
Fig. 2 illustrates one embodiment of the invention.When newly entering image and there is high luminance pixel, utilize the inventive method, reduce the weight of the new data that is used for upgrading background or upgrade background video with the slower time, reach the embodiment of the better foreground data of acquisition.
The difference of image 211 and background video 215 is newly entered in image 213 representatives.In the present embodiment, be that image 211 is deducted after image 215, luminance difference is greater than to one first default value, and the pixel that the pixel intensity of image 211 is greater than one second default value is set as high brightness, other pixel is set as low-light level and obtains.In other embodiments, also can set more default value, to highlight how different luminance differences, for example set a plurality of default values, luminance difference is greater than to the pixel that one first default value and pixel intensity be greater than one second default value and is set as high brightness, by luminance difference in the middle of the first default value and one the 3rd default value and the pixel intensity pixel that is greater than the second default value be set as middle brightness etc.After having upgraded background video, process that newly to enter the mode of image and background video difference many in addition, all applicable method of the present invention.
Similarly, Fig. 3 illustrates another embodiment of the present invention, when image sensor senses the object that newly enters to include in image its default object (being palm/finger in the present embodiment) external form condition, upgrade the weight that background video or minimizing are used for upgrading the new data of background with slower time, vice versa.
Be with the difference of previous embodiment, in the present embodiment, image sensing chip judgement newly enters in image, whether to comprise the object that meets its default object (being palm/finger in the present embodiment) external form condition.The image that includes palm and finger in image 311 is newly entered in image sensing chip judgement, with this, slows down the degree of upgrading background.Image 315, the background video after representative is upgraded, then deducts image 315 by image 311, obtains image 313, in order to carry out follow-up processing.Than the image 219 of Fig. 2, can know and see when the degree of renewal background is slowed down, can go out in image 313 saliency the shape of palm and finger, the resolution of raising prospect and background video.
Fig. 4 illustrates another embodiment of the present invention, is with the difference of previous embodiment, and in the present embodiment, image sensing chip judgement newly enters in image, whether to comprise displacement and occur.Can see in newly entering image 411 having the image of palm/finger to occur, represent that displacement occurs, therefore with the slower time, upgrade the weight that background video or minimizing are used for upgrading the new data of background, vice versa.Thus, obtain an image 415, the background video after representative is upgraded, then deducts image 415 by image 411, obtains image 413, in order to carry out follow-up processing.Than the image 219 of Fig. 2, can know and see when the degree of renewal background is slowed down, can go out in image 413 saliency the shape of palm and finger, the resolution of raising prospect and background video.
In sum, the renewal background method of image processing of the present invention can slow down the degree of upgrading background, the accuracy rate that raising prospect and background video are differentiated.
The above embodiments are only used for exemplifying enforcement aspect of the present invention, and explain technical characterictic of the present invention, are not used for limiting protection category of the present invention.Any those skilled in the art can unlabored change or the arrangement of isotropism all belong to the scope that the present invention advocates, the scope of the present invention should be as the criterion with the scope of claims.
Claims (1)
1. a renewal background method for image processing, is applicable to include an image sensing chip of an image sensor, it is characterized in that, comprises:
Judge that an object enters the reconnaissance range of this image sensor, wherein this reconnaissance range is a solid space; And
Slow down the degree of upgrading background, the accuracy rate of differentiating with raising prospect and background video.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040151374A1 (en) * | 2001-03-23 | 2004-08-05 | Lipton Alan J. | Video segmentation using statistical pixel modeling |
| CN101996410A (en) * | 2010-12-07 | 2011-03-30 | 北京交通大学 | Method and system of detecting moving object under dynamic background |
| CN102446034A (en) * | 2010-10-13 | 2012-05-09 | 原相科技股份有限公司 | Optical touch control system and object sensing method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040151374A1 (en) * | 2001-03-23 | 2004-08-05 | Lipton Alan J. | Video segmentation using statistical pixel modeling |
| CN102446034A (en) * | 2010-10-13 | 2012-05-09 | 原相科技股份有限公司 | Optical touch control system and object sensing method thereof |
| CN101996410A (en) * | 2010-12-07 | 2011-03-30 | 北京交通大学 | Method and system of detecting moving object under dynamic background |
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