Ground target positioning method applied into video monitoring system

Abstract

The invention provides a ground target positioning method applied into a video monitoring system. A monitoring network is divided into smaller-scale sub networks by the aid of constraint of the ground plane, local reference coordinate systems are built for the sub networks, a ground reference point is set, and ground coordinates are calculated via observed values of the position of a target image by the aid of projection relationships of nodal points of various cameras and the ground plane. Parameters of angels, positions and the like of the cameras do not need to be accurately measured in the method, and the method only depends on the constraint of the local ground plane, can be used for most of monitoring systems utilizing fixed cameras, and is particularly used for common application places such as squares, streets and the like.

Description

technical field [0001] The invention belongs to the technical field of video monitoring, in particular to a method for locating ground targets applied in a video monitoring system. Background technique [0002] In the field of video surveillance research, the real-time position of a moving target on the ground is effective auxiliary information for high-level applications such as abnormal behavior detection and camera collaboration; determining the corresponding target ground position from the target image captured by the camera array is an important research content . So far, most of the video surveillance systems that have been put into practice adopt a single fixed camera monitoring mode. Under this condition, an existing positioning method based on camera measurement requires accurate measurement of the position and angle of each camera during installation. Parameter, locate the target according to the offset of the target on the image relative to the optical axis. For...

AI Technical Summary

Problems solved by technology

For a monitoring network equipped with a large number of cameras, this method has certain limitations in actual measurement operations, which is not only inconvenient to measure but also difficult to measure accurately

Another type of positioning method uses laser or infrared ranging sensors to actively measure depth information to assist positioning, which is expensive and difficult to implement on a large scale

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