Video monitoring system for multi-target tracking close-up shooting

Abstract

The invention provides a video monitoring system, which comprises a first image pick-up system, a second image pick-up system and a control system. The first image pick-up system comprises one or more cameras for shooting a wide-angle video within a large-scene vision field; the second image pick-up system comprises one or more pan / tilt / zoom (PTZ) cameras for shooting a local video within the large-scene vision field; and the control system comprises an image acquisition module, a foreground extraction module and a coordinate conversion module. The image acquisition module is used for receiving the wide-angle video shot by the first image pick-up system; the foreground extraction module is used for extracting a target of interest from the wide-angle video; and the coordinate conversion module is used for converting a two-dimensional coordinate (x, y) of the projection of an arbitrary point shot by the first image pick-up system in the large-scene vision field on an image plane of the wide-angle video shot by the first image pick-up system into a vertical altitude angle theta and a horizontal azimuth angle phi when one selected PTZ camera in the second image pick-up system is aligned with the arbitrary point in a picture center by a coordinate conversion mechanism, wherein the coordinate conversion mechanism is established by at least three arbitrary points selected randomly in the large-scene vision field.

Description

technical field [0001] The present invention mainly relates to the technical field of intelligent video monitoring, in particular to a video monitoring system composed of a first camera system for shooting a large scene, a control system for tracking multiple targets in it, and a second camera system for close-up shooting of each tracking target system. Background technique [0002] In many applications, it is necessary to perform video surveillance on a large scene range, and the usual practice is to use a small number of wide-angle cameras to cover a large scene. Due to the wide angle of view of the wide-angle camera and the limitation of the resolution of the image sensor, the resolution of the specific target objects in the captured large scenes is generally low, and it is difficult to obtain the details of the target objects from the captured images information. [0003] One of the existing solutions is to use a large number of distributed fixed cameras with long foca...

AI Technical Summary

Problems solved by technology

However, all existing technologies, including these two patent documents, still have many unsolved problems and deficiencies in terms of effectively realizing precise interaction and control between different camera systems

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