CN102231223A - Foreign object blocking and alarming method used for camera - Google Patents
Foreign object blocking and alarming method used for camera Download PDFInfo
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Abstract
The invention discloses a foreign object blocking and alarming method used for a camera, comprising the following steps of: collecting and storing a frame of image; collecting and storing a next frame of image according to a preset image collecting period; calculating a correlation coefficient of specified regions of a current frame of image and the previous frame of image; and judging whether the correlation coefficient is less than a mutation threshold T1, if so, generating foreign object blocking and alarming, and if not, repeating the steps. The foreign object blocking and alarming method used for the camera, provided by the invention, is simply realized, has strong robustness and can be used for realizing the foreign object blocking and alarming of the camera accurately and efficiently in time.
Description
Technical field
The present invention relates to field of video monitoring, relate in particular to a kind of foreign matter that is used for video camera and block alarm method.
Background technology
Video monitoring is the important component part of security system, and it is a kind of powerful general defensive character in all files.Video monitoring is directly perceived with it, accurately, in time and the information content abundant and be widely used in social all trades and professions, such as occasions such as enterprise, public security, electric power, subway, bank, airport, hospital, frontier defense, government, school, finance, supermarket, telecommunications, gambling house, factory, museum and prisons.
In above-mentioned these were used, the observation position of the rig camera in most video monitorings immobilized or is being maintained fixed in the section sometime.Therefore, cause easily in use,, thereby lost the function of monitoring because foreign matter causes user or guardian can't obtain effective video information to the blocking of user's area-of-interest.More it is worth noting, the generation that foreign matter blocks may indicate the generation that malicious event such as property is stolen, personal security is on the hazard are arranged, and for example stealer blocks that camera lens steals that camera lens that shop equipment, lawless person block the monitoring ATM carries out that finance is extorted, the inmate in the prison is blocked camera lens behavior such as have a fist fight.No matter be that video information can't correctly be obtained, still malicious event takes place, obviously exist poor reliability and detect defectives such as untimely by present artificial video camera foreign matter occlusion detection mode, therefore, in concrete application process, need corresponding foreign matter occlusion detection method and can provide the video camera foreign matter in time, exactly and block warning information, take corresponding measure for the user.
In Chinese patent " denomination of invention: a kind of method that is used for Network Video Surveillance detection video shelter, application number: 200710145468.X " patent in introduced and a kind ofly encoded in conjunction with video, video shelter is judged the method that detects by moving region repeatedly, and this method is mainly used in the situation that video source can not correctly be obtained.In addition, in another part Chinese patent " denomination of invention: the internet protocol camera system that possesses intelligent alarm function, application number: 200810122354.8 " patent in the camera lens introduced block warning function and be applied to motion target area, by judging whether foreground pixel differences in the moving region is realized greater than setting threshold.But, in above-mentioned present disclosed patent, method, system or the device of foreign matter occlusion detection do not proposed clearly, for this reason, a kind of new foreign matter that is used for video camera blocks alarm method and has very important realistic meaning and application prospects.
Summary of the invention
Whether the purpose of the embodiment of the invention is at the deficiencies in the prior art, provides a kind of foreign matter that is used for video camera to block alarm method, blocked by foreign matter in order to rapid and precise detection video camera, and in time provide alarm prompt.In actual applications, the foreign matter that the blocks camera lens object that is mostly that color is concentrated relatively, marginal information is rare and disturbed video source to obtain.The described foreign matter that is used for video camera of the embodiment of the invention blocks the application demand that alarm method considers that camera lens is fixing, whether adopting undergos mutation between the consecutive frame image is judged whether user designated area exists the possibility of being blocked by foreign matter, a nearlyer step ground, utilize the colouring information and the marginal information of appointed area image accurately to detect the situation generation that whether has foreign matter to block again, if have, then in time provide foreign matter and block warning information.
The purpose of the embodiment of the invention reaches by the following technical programs.
A kind of foreign matter that is used for video camera blocks alarm method, and it comprises:
A, collection one two field picture are also preserved;
B, according to the default image acquisition cycle, gather the next frame image and preserve;
The related coefficient of the appointed area of C, calculating current frame image and previous frame image;
D, judge that the size of this related coefficient is whether less than sudden change threshold value T
1If,, then produce foreign matter and block alarm, otherwise, step B entered.
Preferably, the described foreign matter that is used for video camera blocks alarm method and also comprises:
E, according to the color histogram information of the appointed area of current frame image and previous frame image, judge whether the color of this two width of cloth image appointed area close, if, then produce foreign matter and block warning information, otherwise, enter step B.
Preferably, the described foreign matter that is used for video camera blocks alarm method and also comprises:
F, judge whether the marginal information of appointed area of present frame is less, if then foreign matter blocks warning information, otherwise, enter step B.
Preferably, described step D comprises:
D1, the space that gets colors, and counter is initialized as 0;
D2, for M passage of described color space, respectively current frame image and previous frame image are done the difference computing in the pixel of appointed area, with the absolute value of described operation result and default similar threshold value T
2Compare, if less than this similar threshold value T
2, then counter adds 1;
D3, for M passage of described color space, adopt the pixel data of the value of the counter that obtains divided by the appointed area, obtain the related coefficient COF of the appointed area of M current frame image and previous frame image
1, COF
2... COF
M
D4, if described COF
1, COF
2... COF
MIn have its value at least size less than sudden change threshold value T
1, then produce foreign matter and block alarm.
More preferably, described similar threshold value T
2Size greater than the color-set distance, wherein, the size of described color-set distance is
Described N is meant that each passage of color space is divided into N color-set, and described S is meant the GTG of each passage of color space.
Preferably, described step e comprises:
E1, the space gets colors;
E2, for M passage of described color space, each passage is divided into N color-set, wherein, the grey level range of n color-set is
Described N is meant that each passage of color space is divided into N color-set, and described S is meant the GTG of each passage of color space;
E3, N the color-set that described M is tieed up under the color space are mapped to the one-dimensional space one by one, form N^M color-set, and the pixel count that calculates each color-set accounts for the number percent of each respective channel appointed area pixel count;
The number of E4, the main color-set of statistics, wherein, described main color-set is greater than main color-set threshold value T for the number percent that its pixel count accounts for whole appointed area pixel count
3Color-set;
E5, if the number of main color-set less than color threshold concentration T
4, then produce foreign matter and block warning information.
Preferably, described color space is rgb space, YCbCr space, HSV space, HM space or monochromatic space.
Preferably, described step F comprises:
F1, the image of present frame appointed area is done smoothing denoising handle;
F2, utilize edge detection operator to extract the edge of image gradient information of described appointed area, and adopt thresholding method to obtain a width of cloth bianry image described image;
F3, the edge of described bianry image is connected processing, make its edge pixel be combined into the edge of sealing;
The number of F4, statistics limbus, wherein, described obvious border is meant that the number of edge pixel is greater than obvious boundary threshold T
5The edge;
F5, if the number on described obvious border less than sparse edge threshold T
6, then produce foreign matter and block warning information.
Preferably, in described step F 2, described edge detection operator is Robert operator, Sobel operator, Laplace operator, Candy operator, Canny operator or LoG operator.
Preferably, in described step F 2, described thresholding method is the Otsu thresholding method.
By the technical scheme of the invention described above embodiment as can be seen, the foreign matter that is used for video camera of the present invention blocks alarm method, and its implementation is simple, and strong robustness can realize accurately, in time and effectively that the foreign matter of video camera blocks alarm.
Description of drawings
Fig. 1 is the process flow diagram that the foreign matter that is used for video camera that one embodiment of the invention provides blocks alarm method.
The realization of the object of the invention, functional characteristics and excellent effect are described further below in conjunction with specific embodiment and accompanying drawing.
Embodiment
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is described in further detail, can be implemented so that those skilled in the art can better understand the present invention also, but illustrated embodiment is not as a limitation of the invention.
The foreign matter that is used for video camera that provides according to one embodiment of the invention blocks alarm method, and as shown in Figure 1, it comprises:
A, collection one two field picture are also preserved;
B, according to the default image acquisition cycle, gather the next frame image and preserve;
The related coefficient of the appointed area of C, calculating current frame image and previous frame image;
D, judge that the size of this related coefficient is whether less than sudden change threshold value T
1If,, then produce foreign matter and block alarm, otherwise, step B entered.
Wherein, the described image that collects can save as various picture formats such as gray level image, RGB, YUV, in addition, the image acquisition cycle of adjacent two two field pictures should be blocked the used time of alarm method greater than the foreign matter that is used for video camera that the embodiment of the invention provides, and detect delay time no longer than the patient foreign matter of institute in concrete the application, for example, be t when the foreign matter in video camera blocks the time that alarm method consumes
1, during image acquisition cycle Δ t, so described foreign matter detects delay time and is not more than t
1+ Δ t.
It should be noted that, appointed area among the above-mentioned steps C is the zone that is provided with by User Defined, for example is to hold the zone, and its size should be not more than size of images, correspondingly, hereinafter " appointed area " speech of indication all is meant the appointed area that has set in this step C.Described related coefficient is the index of similarity between tolerance present frame and previous frame two width of cloth images, and this index value is between 0 to 1, and big more expression two width of cloth images of its value are similar more.It generally all is to block institute by large-area foreign matter to cause that the foreign matter of considering video camera blocks, and therefore is judged as sudden change when the diversity ratio between two two field pictures is big, and in the method, the related coefficient that is embodied in two two field pictures is less than the threshold value T that suddenlys change
1The time, judge and foreign matter occurs and block and produce corresponding alarm, in the method, sudden change threshold value T
1Value need less, for example described sudden change threshold value T
1Size be 0.1～0.3.
According to a kind of preferred implementation of present embodiment, the described foreign matter that is used for video camera blocks alarm method and also comprises step e,, wherein said step e comprises:
E, according to the color histogram information of the appointed area of current frame image and previous frame image, judge whether the color of this two width of cloth image appointed area close, if, then produce foreign matter and block warning information, otherwise, enter step B.
In step D, if the size of related coefficient of appointed area of judging current frame image and previous frame image is less than the threshold value T that suddenlys change
1Can draw the fact that video camera has been blocked by foreign matter in theory, promptly can produce foreign matter and block alarm according to this fact, but on the basis of this step, increase above-mentioned steps E, can confirm better whether video camera is blocked and whether produce foreign matter by foreign matter and block alarm, hereinafter will specifically set forth the detailed implementation step of this step D.
More preferably, the described foreign matter that is used for video camera blocks alarm method and also comprises:
F, judge whether the marginal information of appointed area of present frame is less, if then foreign matter blocks warning information, otherwise, enter step B.
On the basis of above-mentioned steps D and step e, whether can judge video camera is to a certain extent blocked by foreign matter, but in the preferred implementation of the embodiment of the invention, when having increased this step F, promptly can improve the accuracy that foreign matter blocks alarm, hereinafter will specifically set forth the concrete implementation step of this step F.
Below, will specifically set forth described step D, described step D comprises:
D1, the space that gets colors, and counter is initialized as 0;
D2, for M passage of described color space, respectively current frame image and previous frame image are done the difference computing in the pixel of appointed area, the absolute value of described operation result is compared with the similar threshold value T2 that presets, if less than this similar threshold value T2, then counter adds 1;
D3, for M the passage (for example, described M is 1 or 3) of described color space, adopt the pixel data of the value of the counter that obtains divided by the appointed area, obtain the related coefficient COF of the appointed area of M current frame image and previous frame image
1, COF
2... COF
M
D4, if described COF
1, COF
2... COF
MIn have its value at least size less than sudden change threshold value T
1, then produce foreign matter and block alarm.
In addition, described similar threshold value T
2Be preset value, be used for weighing the whether similar index of two pixels, when the absolute value of the difference of two pixels greater than this similar threshold value T
2The time, assert that then the difference of two pixels is bigger, less than this this similar threshold value T
2The time, assert that then two pixels are close, in above-mentioned steps D2, described similar threshold value T
2Size greater than the color-set distance, wherein, the size of described color-set distance is
Described N is meant that each passage of color space is divided into N color-set, and described S is meant the GTG of each passage of color space.For example, be 8bit for each passage of more common color space, then the big I of described S is expressed as totally 256 GTGs in 0～255 scope.
Below, specifically set forth described step e, described step e comprises:
E1, the space gets colors;
E2, for M passage of described color space, each passage is divided into N color-set, wherein, the grey level range of n color-set is
Described N is meant that each passage of color space is divided into N color-set, and described S is meant the GTG of each passage that refers to color space;
E3, N the color-set that described M is tieed up under the color space are mapped to the one-dimensional space one by one, form N^M color-set, and the pixel count that calculates each color-set accounts for the number percent of each respective channel appointed area pixel count;
The number of E4, the main color-set of statistics, wherein, described main color-set is greater than main color-set threshold value T for the number percent that its pixel count accounts for whole appointed area pixel count
3Color-set;
E5, if the number of main color-set less than color threshold concentration T
4, then produce foreign matter and block warning information.
Preferably, described color space is rgb space, YCbCr space, HSV space, HMMD space or monochromatic space.
In this step, the value of the number N of the color-set of described each passage division need consider to differentiate the balance of confidence level (wherein, N is big more, and confidence level is high more, but calculated amount is big more) and calculated amount.Described main color-set threshold value T
3Be preset value, can be according to the User Defined setting, described color threshold concentration T
4The intensity of the color of the foreign matter that may occur in should considering to use, the color of foreign matter is concentrated more, then color threshold concentration T
4Value should be more little, for described main color-set threshold value T
3And color threshold concentration T
4Value can be according to those skilled in the art according to concrete application and self-defined setting is not done this here and given unnecessary details one by one and limit.
Below, specifically set forth described step F, described step F comprises:
F1, the image of present frame appointed area is done smoothing denoising handle;
F2, utilize edge detection operator to extract the edge of image gradient information of described appointed area, and adopt thresholding method to obtain a width of cloth bianry image described image;
F3, the edge of described bianry image is connected processing, make its edge pixel be combined into the edge of sealing;
The number of F4, statistics limbus, wherein, described obvious border is meant that the number of edge pixel is greater than obvious boundary threshold T
5The edge;
F5, if the number on described obvious border less than sparse edge threshold T
6, then produce foreign matter and block warning information.
In the specific implementation process, in described step F 2, described edge detection operator is Robert operator, Sobel operator, Laplace operator, Candy operator, Canny operator or LoG operator.
In the specific implementation process, in described step F 2, described thresholding method is the Otsu thresholding method.
Be to be understood that; above-mentioned cited edge detection operator and thresholding method be not be the embodiment of the invention exhaustive embodiment; those skilled in the art are understood that and learn; according to spirit of the present invention; the edge detection operator and the thresholding method that also have other can be applied in the embodiments of the invention, here not in order to restriction protection scope of the present invention.
Above-mentioned obvious boundary threshold T
5Setting relevant with the size of appointed area, the appointed area size is big more in principle, then obvious boundary threshold T
5Value also big more.Described sparse edge threshold T
6The rare degree in edge of the value foreign matter that specifically may occur in need considering to use, if the edge of foreign matter is rare more, then sparse edge threshold T
6Value more little.
Introduction by the embodiment of the invention described above is not difficult to find out, the described foreign matter that is used for video camera that the embodiment of the invention provides blocks alarm method, its implementation is simple, and strong robustness can realize accurately, in time and effectively that the foreign matter of video camera blocks alarm.
The above only is the preferred embodiments of the present invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes instructions of the present invention and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. a foreign matter that is used for video camera blocks alarm method, it is characterized in that, comprising:
A, collection one two field picture are also preserved;
B, according to the default image acquisition cycle, gather the next frame image and preserve;
The related coefficient of the appointed area of C, calculating current frame image and previous frame image;
D, judge that the size of this related coefficient is whether less than sudden change threshold value T
1If,, then produce foreign matter and block alarm, otherwise, step B entered.
2. the foreign matter that is used for video camera as claimed in claim 1 blocks alarm method, it is characterized in that, also comprises:
E, according to the color histogram information of the appointed area of current frame image and previous frame image, judge whether the color of this two width of cloth image appointed area close, if, then produce foreign matter and block warning information, otherwise, enter step B.
3. the foreign matter that is used for video camera as claimed in claim 1 blocks alarm method, it is characterized in that, also comprises:
F, judge whether the marginal information of appointed area of present frame is less, if then foreign matter blocks warning information, otherwise, enter step B.
4. the foreign matter that is used for video camera as claimed in claim 1 blocks alarm method, it is characterized in that, described step D comprises:
D1, the space that gets colors, and counter is initialized as 0;
D2, for M passage of described color space, respectively current frame image and previous frame image are done the difference computing in the pixel of appointed area, with the absolute value of described operation result and default similar threshold value T
2Compare, if less than this similar threshold value T
2, then counter adds 1;
D3, for M passage of described color space, adopt the pixel data of the value of the counter that obtains divided by the appointed area, obtain the related coefficient COF of the appointed area of M current frame image and previous frame image
1, COF
2... COF
M
D4, if described COF
1, COF
2... COF
MIn have its value at least size less than sudden change threshold value T
1, then produce foreign matter and block alarm.
5. the foreign matter that is used for video camera as claimed in claim 4 blocks alarm method, it is characterized in that described similar threshold value T
2Size greater than the color-set distance, wherein, the size of described color-set distance is
Described N is meant that each passage of color space is divided into N color-set, and described S is meant the GTG of each passage of color space.
6. the foreign matter that is used for video camera as claimed in claim 2 blocks alarm method, it is characterized in that, described step e comprises:
E1, the space gets colors;
E2, for M passage of described color space, each passage is divided into N color-set, wherein, the grey level range of n color-set is
Described N is meant that each passage of color space is divided into N color-set, and described S is meant the GTG of each passage of color space;
E3, N the color-set that described M is tieed up under the color space are mapped to the one-dimensional space one by one, form N^M color-set, and the pixel count that calculates each color-set accounts for the number percent of each respective channel appointed area pixel count;
The number of E4, the main color-set of statistics, wherein, described main color-set is greater than main color-set threshold value T for the number percent that its pixel count accounts for whole appointed area pixel count
3Color-set;
E5, if the number of main color-set less than color threshold concentration T
4, then produce foreign matter and block warning information.
7. block alarm method as the described foreign matter that is used for video camera of the arbitrary claim of claim 4-6, it is characterized in that, described color space is rgb space, YCbCr space, HSV space, HM space or monochromatic space.
8. the foreign matter that is used for video camera as claimed in claim 3 blocks alarm method, it is characterized in that, described step F comprises:
F1, the image of present frame appointed area is done smoothing denoising handle;
F2, utilize edge detection operator to extract the edge of image gradient information of described appointed area, and adopt thresholding method to obtain a width of cloth bianry image described image;
F3, the edge of described bianry image is connected processing, make its edge pixel be combined into the edge of sealing;
The number of F4, statistics limbus, wherein, described obvious border is meant that the number of edge pixel is greater than obvious boundary threshold T
5The edge;
F5, if the number on described obvious border less than sparse edge threshold T
6, then produce foreign matter and block warning information.
9. the foreign matter that is used for video camera as claimed in claim 8 blocks alarm method, it is characterized in that, in described step F 2, described edge detection operator is Robert operator, Sobel operator, Laplace operator, Candy operator, Canny operator or LoG operator.
10. the foreign matter that is used for video camera as claimed in claim 8 blocks alarm method, it is characterized in that, in described step F 2, described thresholding method is the Otsu thresholding method.
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