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A method for detecting foreign object occlusion in video image of surveillance camera

A technology of occlusion detection and screen, applied in image data processing, instrumentation, calculation, etc., can solve the problems that the system cannot perform automatic detection, etc., and achieve the effect of improving the normal operation rate

Inactive Publication Date: 2017-08-25
SHENZHEN E WELLY ELECTRONICS
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for detecting foreign object occlusion of the video screen of a surveillance camera, which solves the problem in the prior art that the system cannot perform automatic detection due to the non-subjective state of foreign object occlusion caused by the non-subjective intention of the outdoor surveillance video screen

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  • A method for detecting foreign object occlusion in video image of surveillance camera
  • A method for detecting foreign object occlusion in video image of surveillance camera
  • A method for detecting foreign object occlusion in video image of surveillance camera

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Embodiment Construction

[0037] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] Such as figure 1 As shown, although the video picture with partial occlusion still has a scene, the occluder usually appears defocused and blurred because it is close to the lens and is not on the focal plane. Therefore, judging whether there is an occluder is actually judging whether there is something abnormally close to the lens out-of-focus objects.

[0039] Based on above-mentioned principle, the inventive method implements according to the following steps:

[0040] Step 1. Initialize

[0041] 1.1) The blocked duration of the initialization video picture is time=0;

[0042] 1.2) Make t=time+1, read the current video frame image as [f t (i,j)] m×n ,Such as figure 1 as shown,

[0043] Among them, t represents the moment when the occlusion is detected, that is, the tth frame of the video image frame, the size of the image fram...

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Abstract

The invention discloses a foreign matter blocking detecting method of monitoring camera video images. The method includes the steps of firstly, initiating; secondly, calculating d neighbor gradient which is used for judging frame image defocusing degree; thirdly, calculating a gradient degree parameter according to the d neighbor gradient; fourthly, judging whether a gradient statistical variable k reaches an upper limit or not so as to determine whether gradient degree parameter calculation is completed or not; fifthly, performing binarization on the acquired gradient degree parameter; sixthly, performing block statistic on the binarization result; seventhly, judging whether blocking exists or not according to block static data; eighthly, outputting the continuous blocking state results of a camera. The method is simple in step and accurate in result.

Description

technical field [0001] The invention belongs to the technical field of intelligent monitoring video processing, and relates to a method for detecting foreign objects blocking video images of monitoring cameras. Background technique [0002] At present, the use of security monitoring cameras is becoming more and more popular, and the monitoring network formed by the networking of cameras is becoming larger and larger. This requires automatic detection of the working status of the cameras and alarms for abnormal situations that occur. In the case of an abnormality in the surveillance video screen, the video screen is partially blocked. If an intruder blocks the lens with a towel or other covering, the current video quality monitoring system can complete the situation that all the scenes in the screen disappear. However, if the location where the surveillance camera is placed is blocked by branches and leaves of trees, or by plastic bags blown by the wind, such non-subjective a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00
CPCG06T7/0002G06T2207/30232
Inventor 简坤胜
Owner SHENZHEN E WELLY ELECTRONICS
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