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Method of judging shielding state of pick-up lens based on video image signal

A technology of video image and camera lens, which is applied in the field of judging the occlusion state of the camera lens based on the video image signal, and remotely judging whether the lens of the monitoring camera is blocked for timely processing. It can solve the problems of small application range and easy misjudgment, etc. Achieve the effect of simple method, high precision and wide adaptability

Active Publication Date: 2013-06-05
昆山南邮智能科技有限公司
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to invent a method for judging the occlusion state of the camera lens based on video image signals with high accuracy and wide application range, aiming at the problems that the existing occlusion monitoring method has a small application range and is prone to misjudgment

Method used

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with embodiment.

[0030] A method for judging camera lens occlusion state based on video image signal, it comprises the following steps:

[0031] First, obtain the color image captured by the camera;

[0032] Secondly, the color image is replaced in the chromaticity space to obtain a grayscale image; the background is extracted by the frame difference method, and the background is dynamically updated as the background used in the next cycle; the background extraction method includes: setting and original image Two pixel storage spaces of equal size, one for background B and one for background mask Y, initialize the pixel storage space to 0; secondly, after subtracting the first frame from the second frame of the video image, the pixel value is 0 , then set the pixel value of this point to 1 in the background mask Y, and set all the pixel values ​​of other pixel values ​​not to 0 in the background mas...

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Abstract

The invention discloses a method of judging a shielding state of a pick-up lens based on a video image signal. The method is characterized by conducing image processing for a video image by taking of a camera, extracting background of the video, obtaining foreground, conducting binarization processing for the foreground, dividing a foreground block, according to the size of a pixel area of the foreground block, obtaining a foreground detection unit, filtering a nuisance area in the foreground detection unit, obtaining a suspicious sheltering area, and if the sheltering area value is judged to be larger than preset sheltering threshold value, the camera is confirmed to be sheltered. The method is used for solving the technical problem that the camera is sheltered so as to cause monitoring failure. The method has the advantages of being simple in method, high in precision, and wide in adaptability.

Description

technical field [0001] The present invention relates to a video surveillance technology, in particular to a method for remotely determining whether a monitoring camera lens is blocked for timely processing, specifically a method for judging the blocking state of a camera lens based on a video image signal. Background technique [0002] At present, video surveillance systems of various sizes in various industries in my country are very common. In addition to special fields such as public security, finance, banking, transportation, military and ports, communities, office buildings, hotels, public places, factories, shopping malls, communities, and even The family has installed a video surveillance system. The field of video surveillance has accelerated development in recent years, but with the continuous increase in the number of surveillance cameras, the number ranges from a few thousand to tens of thousands or hundreds of thousands. Especially for cameras that have been use...

Claims

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Application Information

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IPC IPC(8): H04N7/18H04N5/14
Inventor 李晓飞韩光林泽方芳郑晨何辉聪
Owner 昆山南邮智能科技有限公司
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