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Angle-based wandering track detection method in video surveillance

A detection method and video monitoring technology, applied in the field of image processing, can solve the problems of poor applicability and low accuracy, and achieve the effects of improving detection accuracy, reducing time and space complexity, and improving real-time processing performance.

Active Publication Date: 2011-06-15
海宁市黄湾镇资产经营有限公司
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Problems solved by technology

[0004] In order to overcome the shortcomings of low accuracy and poor applicability of the existing trajectory detection methods in video surveillance, the present invention provides an angle-based wandering trajectory detection method in video surveillance with high accuracy and good applicability

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  • Angle-based wandering track detection method in video surveillance

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] refer to Figure 1 to Figure 5 , an angle-based loitering trajectory detection method in video surveillance, comprising the following steps:

[0031] The first step is to detect moving objects for each frame of images collected;

[0032] In the second step, after the target is detected, the positions A and C of the moving target in the initial two frames are determined, and the target positions of the initial two frames are connected to generate a ray AC;

[0033] In the third step, the starting point A of the moving target in the initial frame is also used as the starting point, and the angle α between the rays AD and AC passing through each target position D is calculated. Define the origin of the coordinates in the video, assuming that the coordinates of A, C, and D in the video sequence are: A(x 1 ,y 1 ), C(x 2 ,y 2 ), D(x 3 ,y 3 ), the calculation m...

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Abstract

The invention discloses an angle-based wandering track detection method in video surveillance, which comprises the following steps of: 1, performing moving target detection on each acquired frame of image; 2, after a target is detected, determining positions A and C of the moving target in two initial frames, and connecting the target positions n the two initial frames to generate a radial AC; 3, similarly, taking the initial point A of the moving target in the initial frame as a starting point, and calculating an included angle alpha between a radial AD passing each target position D and the radial AC; 4, determining the type of a track according to the changing regularity of the included angle alpha, judging whether the track is a wandering track or not, and setting a wandering threshold with an initial value 0; and 5, judging whether the wandering threshold exceeds the set threshold or not, giving a wandering alarm if the wandering threshold exceeds the set threshold, otherwise returning to the step 1 to reacquire a video sequence. The method ensures high accuracy and high applicability.

Description

technical field [0001] The invention relates to an image processing method in video monitoring, in particular to a method for detecting a moving target track in video monitoring. Background technique [0002] Video Surveillance (Video Surveillance) is an important part of the security system, because of its intuition, convenience and effectiveness, it has become one of the main ways to improve security. Trajectory detection is one of the important functions of intelligent video surveillance. It plays a very important role in the monitoring of moving target behavior. For example, if there is a hovering moving target next to valuables such as cars, then the wandering target is likely to commit theft. Or other illegal acts; if a loitering target is found on a river embankment or beside a railway track, then the loitering target may implement behaviors that endanger its own safety. Loitering trajectory detection is one of the effective methods to explore the loitering behavior ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/20H04N7/18
Inventor 宦若虹王浙沪唐晓梅陈庆章
Owner 海宁市黄湾镇资产经营有限公司
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