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Camera lens occlusion detecting system and method
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A technology for lens occlusion and detection methods, which is applied in the parts of TV systems, image data processing, TV and other directions, and can solve problems such as the inability of algorithms to function.
Inactive Publication Date: 2013-03-27
上海智觉光电科技有限公司
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At present, many surveillance systems have been in operation for many years, and some lenses in the system have been blocked for a long time, and the blocked image area has been in a static state, and these algorithms cannot function
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Embodiment 1
[0095] The invention discloses a camera lens occlusion detection system and detection method, which can solve the problem of erroneous detection results caused by changes in scene brightness, and directly analyze the image characteristics of occluders to determine whether the lens is occluded, not from the perspective of pixel changes. The system and method of the present invention do not require a reference frame, and can detect occlusion faster, so the present invention can be performed at any time, and can effectively detect whether the lens is blocked even after occlusion occurs.
[0096] The present invention does not detect moving objects. Therefore, even if the moving object is large, it will not be misjudged as occlusion. However, no matter whether it is moving or still, as long as the occluding object appears on the lens or is very close to the lens, it can be detected immediately. Judged as occlusion.
[0097] see figure 2 , the camera lens occlusion detection syst...
Embodiment 2
[0145] In this embodiment, the camera lens occlusion detection system of the present invention includes:
[0146] Image acquisition module, in order to obtain the digital image of monitoring camera;
[0147] Image preprocessing module, in order to adopt median filter to eliminate the big noise in the image, carry out background smoothing to the image that gathers;
[0148] The background building module is used to perform an opening operation on the image according to the obtained image, and perform low-pass filtering on the image after the opening operation to eliminate holes in the image and obtain a smooth background image;
[0149] A high-frequency component extraction module is used to obtain a high-frequency component distribution map for the difference between the original image and the background image;
[0150] A high-frequency component enhancement module is used to enhance the high-frequency component of the image;
[0151] The generalized image building module is...
Embodiment 3
[0163] In this embodiment, the camera lens occlusion detection method of the present invention includes the following steps:
[0164] [Step S100 ] Obtain an image, and the detection module acquires the digital image of the current frame from the front-end device.
[0165] [Step S200 ] Image preprocessing. Use median filtering to remove large noise in the image.
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Abstract
The invention discloses a camera lens occlusion detecting system and method. The system comprises an image collection module, an image pre-processing module, a background establish module, a high-frequency component extraction module, a generalized image establish module, a suspected occlusion area detection module and an occlusion area determining module, wherein the background establish module is used for acquiring a smooth background image; the high-frequency component extraction module differentiates an initial image and the background image to acquire a high-frequency component distribution graph; the generalized image establish module combines an enhanced image and a pre-processed initial image to establish a generalized image, and performs edge extraction on the generalized image and the generalized image is convolved; the suspected occlusion area detection module compares a convolution result with a preset threshold, and determines that the suspected occlusion area is a candidate occlusion area if the convolution result is less than the preset threshold; and the occlusion area determining module traces the subsequent image pixel value of the suspected occlusion area, and determines that the suspected occlusion area is an occlusion area finally if brightness variations of all the pixels in the area are less than the preset threshold. By using the system and the method, whether the lens is occluded or not can be effectively judged.
Description
technical field [0001] The invention belongs to the technical field of video monitoring, and relates to a monitoring system, in particular to a camera lens occlusion detection system; meanwhile, the invention also relates to a camera lens occlusion detection method. Background technique [0002] With the continuous increase of the monitoring system network, the number of cameras deployed in the network continues to increase. For example, in the urban traffic monitoring system, the number of monitoring points can range from tens of thousands to hundreds of thousands. There are more and more cameras in the system, and it is impossible to arrange enough security personnel to check the working status of each camera. Many cameras cannot work normally due to long-term unmaintained, including power failure, virtual focus, occlusion, etc., resulting in the inability to monitor. Checking the working status of the camera in real time requires the intelligence of the camera itself to ...
Claims
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