Real-time loitering detection method based on dynamic programming

A technology of dynamic programming and detection methods, applied in image analysis, instruments, calculations, etc., can solve the problems of large background disturbance, easy to cause mismatch, low target matching accuracy, etc. Stable and reliable algorithm performance

Inactive Publication Date: 2012-12-05
NANJING UNIV OF SCI & TECH
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Problems solved by technology

This method is greatly affected by background disturbance, and the accuracy of target matching is not high, which is easy to cause mis-matching

Method used

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  • Real-time loitering detection method based on dynamic programming
  • Real-time loitering detection method based on dynamic programming
  • Real-time loitering detection method based on dynamic programming

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Embodiment Construction

[0018] The present invention adopts the idea of ​​dynamic planning trajectory tracking for image feature points, does not perform target detection on the image of the monitoring area, directly tracks the trajectory of candidate wandering target pixels in the image, and evaluates each trajectory, and the trajectory is greater than the set wandering threshold Then it is considered as the trajectory of the loitering target, and then the loitering target is determined.

[0019] combine figure 1 , the present invention's real-time wandering detection method based on dynamic programming comprises the following steps:

[0020] Step 1: Extract the feature points of the current Kth frame image as candidate wandering target pixels. The feature points are strong corner points. A strong corner point is defined as a point where the brightness of a two-dimensional graphic changes sharply or a point with a maximum curvature on the edge curve of the graphic; set the feature point extraction...

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Abstract

The invention discloses a real-time loitering detection method based on dynamic programming, which belongs to the field of real-time video detection. The method comprises: firstly, extracting the feature points of an image of the current frame; secondly, carrying out SSDA (sequential similarity detection algorithm) matching between the extracted feature points and an image of the previous frame to detect the corresponding matched feature points; then, carrying out feature point trajectory tracking of dynamic programming; evaluating each trajectory by an evaluation function; detecting the evaluation function value of each trajectory; determining that a loitering target occurs in the monitored area if the evaluation function value exceeds a set loitering threshold; and displaying the loitering trajectory and sending an alarm instruction. The method provided by the invention can effectively improve the loitering target recognition capability without needing a large amount of prior information, is easy to realize, is less influenced by the background of the monitored area, and has the advantages of stable and reliable performance and less calculation amount.

Description

technical field [0001] The invention relates to a real-time video detection method, in particular to a real-time wandering detection method based on dynamic programming. Background technique [0002] Loitering in video surveillance loitering detection means that in a video surveillance system, one or more objects move back and forth in a certain area. Loitering detection can evaluate the threat level of objects in the area, which plays an important role in many occasions. For example, loitering targets are not allowed in front of the bank, and loitering detection is required at this time; no loitering targets are allowed around dangerous facilities such as high-voltage lines. [0003] Chinese patent CN101770648A proposes "a system and method for loitering detection based on video surveillance". In this patent, the moving target in the set area is detected first, and then the target is matched with the target that has appeared to determine whether the target is a moving tar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/20
Inventor 张宝辉韩亦勇闵超波李英杰姜斌夏朋浩袁光
Owner NANJING UNIV OF SCI & TECH
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