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Detection method and device for tripwire crossing of object and video monitoring system

A detection method and detection device technology, which are applied to closed-circuit television systems, instruments, character and pattern recognition, etc., can solve problems such as false alarms and inaccurate judgments, and achieve the effect of improving accuracy

Inactive Publication Date: 2013-12-25
SHENZHEN WISION TECH HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are at least two problems in this method: first, it is only judged by the front and rear positions of the target and a point on the trip line, which may easily lead to inaccurate judgment; Out of bounds, which is prone to false alarms

Method used

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  • Detection method and device for tripwire crossing of object and video monitoring system
  • Detection method and device for tripwire crossing of object and video monitoring system
  • Detection method and device for tripwire crossing of object and video monitoring system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 2 As shown, the detection method of the target crossing the trip wire in this embodiment includes the following steps:

[0023] Range point determination step S10, according to the received tripwire drawn by the operator on the video image, determine the effective range for detecting the moving target crossing the tripwire, and select two points respectively located on both sides of the tripwire from the effective range as The first judgment point and the second judgment point. Step S10 specifically includes steps S101-S103:

[0024] In area judging step S101, the area of ​​the circle determined with the center point of the tripwire as the center is the effective area, and it is judged whether the active object is currently outside the effective area, and if so, no processing is performed.

[0025] Specifically, while receiving the tripwire drawn by the operator on the video image, the starting point coordinate P of the tripwire can be determined s (x...

Embodiment 2

[0062] Such as Figure 5 As shown, this embodiment provides a detection device for a target crossing a trip line, including: a range point determination module 10 and a line crossing judgment module 20 . The range point determination module 10 is used to determine the effective range for detecting the active target crossing the trip wire according to the received trip wire drawn by the operator on the video image, and select two points respectively located on both sides of the trip wire from the effective range As the first judgment point and the second judgment point; the line-crossing judging module 20 is used to detect the position of the active target, and determines that the active target has crossed all the distances according to the position of the active target and the changes in the distances of the first judgment point and the second judgment point respectively. Describe the tripwire.

[0063] The range point determination module 10 specifically includes an area jud...

Embodiment 3

[0067] This embodiment provides a video monitoring system, which includes the device for detecting a target crossing a trip wire according to Embodiment 2.

[0068] Those skilled in the art can understand that all or part of the steps of the various methods in the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium can include: read-only memory, Random access memory, disk or CD, etc.

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Abstract

The application relates to a detection method and device for tripwire crossing of an object and a video monitoring system. The method includes a range-point determination step: according to a received tripwire which is drawn on a video image by an operator, determining an effective range used for detecting tripwire crossing by a moving object and selecting two points, which are at the two sides of the tripwire respectively, in the effective range as a first judgment point and a second judgment point; and an tripwire crossing judging step: detecting the position of the moving object and according to changes of distances between the position of the moving object and the first judgment point and the second judgment point respectively, determining that the moving object crosses the tripwire. Through determination of the effective range, it is prevented that when the object passes by outside the tripwire, the behavior is also regarded as a boundary-crossing behavior and at the same time, in judging whether the object is boundary-crossing, not only is a front and rear coordinate position relation of the moving object judged, but the two points at the two sides of the tripwire are also selected in the effective range as a judgment basis to determine whether the moving object is boundary-crossing so that accuracy in judging whether the tripwire is crossed is improved.

Description

technical field [0001] The present application relates to the technical field of video surveillance, in particular to a method and device for detecting a target passing a trip wire in a video image, and a video surveillance system. Background technique [0002] Video surveillance is widely used. Through intelligent analysis of video, it can be judged whether there is an active target crossing the boundary or invading the area of ​​interest. At present, commonly used analysis techniques use methods such as setting trip wires or areas to make judgments. Tripwires are generally used as perimeters, and if a target crosses the tripwire from outside the perimeter into the inside of the perimeter, that is, from one side of the tripwire to the other side, an alarm is issued. The current method of judging whether the target has passed the trip wire is usually, such as figure 1 As shown, set a tripwire in the image, there are two coordinates x and y in the image plane, x is the hori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00H04N7/18
Inventor 刘德健陈天健赵勇
Owner SHENZHEN WISION TECH HLDG
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