Method and system for detecting whether camera is covered or not

Abstract

The embodiment of the invention discloses a method and system for detecting whether a camera is covered or not and belongs to the technical field of image processing. By The adoption of the method and system for detecting whether the camera is covered or not, the covered state of the camera can be accurately judged, and the misjudgment rate is reduced. The method mainly comprises the steps that an image frame obtained when the camera is not covered is used as a reference frame; the distribution similarity between the grey level histogram of a current frame and the grey level histogram of the reference frame is compared with a first threshold value, if the distribution similarity is smaller than the first threshold value, the distribution similarities between the grey level histograms of multiple continuous frames behind the current frame and the reference frame are sequentially compared with the first threshold value, and if all the distribution similarities are smaller than the first threshold value, the next frame of the multiple continuous frames is used as a first current frame; the similarity between the grey level histograms of every two adjacent image frames of the first current frame and multiple continuous frames behind the first current frame is compared with a second threshold value, and if the similarity between the grey level histograms of every two adjacent image frames of the first current frame and multiple continuous frames behind the first current frame is larger than the second threshold value, it is determined that the camera is covered.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a method and system for detecting that a camera is blocked. Background technique [0002] Security is an issue that people are generally concerned about, especially in some public places, where the personnel are complex and highly mobile. In order to ensure everyone's safety, it is also very beneficial to install surveillance cameras. A clear surveillance device can not only Help us prevent some things from happening, and also provide some clues for how to deal with other things. [0003] For example, the installation of surveillance cameras in the factory production workshop is conducive to timely understanding of the situation and efficient management. Managers can timely and intuitively understand the situation of the production line through the monitoring camera, which is convenient for the implementation of command and management work. It can also make the...

AI Technical Summary

Problems solved by technology

[0004] The above scenarios require the camera to work under normal conditions in order to have a good auxiliary effect. Once the camera is blocked, the monitoring object cannot be observed through the camera. Although there are already some methods for detecting whether the camera is blocked, However, there are still some problems, such as the inability to recognize complex occlusions in the picture, the inability to identify occlusions with uneven brightness, and the inability to recognize dynamic occlusions, etc., resulting in a very high false alarm rate.

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