The Application Of CCTV Target Location Technology In VTS

Maritime traffic as an important transportation is supervised by the branch of maritime management with Vessel Traffic Services (VTS). At present, marine bureaus' VTS system in many provinces has been configured closed circuit television subsystem. As an important supervising manner, CCTV system can prolong the time of supervision; it also can widen the range of supervision.Compared with radar subsystem, the existing CCTV video surveillance subsystem could only achieve the real-time supervising and recording of the locale. It couldn't select useful information from a lot of plane figures to judge and estimate the traffic situation effectively. Radar subsystem as a relatively mature technology, its power and performance is hardly to be exerted, due to the effect of environment and water conditions. So, we needs a kind of modified target location technology urgently, in order to compensate the weakness of radar in some specifically conditions.This thesis, coming from "the branch project of Zhicheng bridge station of Yichang vessel traffic management system" for Yichang maritime authorities, is mainly researching on the improvement of the CCTV supervising technology in the project. This article advances a theory of binocular stereoscopic location based on CCTV subsystem. This kind of location method is enlightened by robot vision, according to the measurement based on angle measuring. First, establishes the model of location; second, obtains the extrinsic parameter matrix of camera; finally, the locating result is shown as a uniform coordinate. On the basis of error transfer function, this article analyses the source of error and its effects. Analytic result shows that CCTV targets location technology should brings better effect of close-in target location, if it is supported by a better image processing technology.In order to make CCTV target location technology develop to actual application environment, this article combines Visual C++ development platform, has designed an experimental system for simple target in simple condition. In the process of project design, this article analysis how to choose the equipment on the background of maritime traffic environment. It is simplified just when it carried out.System structure using module as basic units; hierarchy is very clearly. System structure is mainly divided into Video capture and process module(includes target identifying and stereoscopic matching of binocular system, digital PTZ intelligent control module, real time location module, terminal display module(shows the image of target and the result of location). Every module works independently, shares data continuously, and achieves linkage controlling.