| Presently, the video monitoring system is widely used in different areas, for example, power systems, office buildings, urban transportation, community security and so on. With the improvement of modernization in forest fire prevention in China, video monitoring system has been gradually applied in this field.However, the ordinary equipment of video monitoring system neither can clearly show the monitored region in the forest in fog and at night nor can determine the geographical position of the forest fire and the surrounding forest resources of ignition.The present forest fire prevention GIS collects data related to the forest fire prevention via different methods, and then establishes the corresponding database for forest fires forecast, decision-making, post-disaster assessment.But this kind of forest fire prevention GIS can not reflect the conditions in monitored forest area, thus, it is difficult to detect forest fires immediately.Therefore, there is a need to effectively combine the video monitoring technology and the GIS technology, because video monitoring system has the advantage of being intuitive and real-time while fire GIS can access to any point of topography as well as the situation of forest resources at any time. In a word, the key to collaboration is the linkage of information between the two technologies.The main content of this thesis is about the simultaneous tracking of video visual domain in the forest fire prevention GIS with the focus on synchronization tracking algorithm of video visualization domain, and the goal of this thesis is to simultaneously display the same object in video monitoring system and in forest fire prevention GIS and to timely detect the forest fires and provide technical support to the decision-making.The study content and the results of this thesis are as follows:Firstly,it starts from the basic algorithm of the visibility analysis and the basic technology of synchronization tracking, summarizes the basic steps of the visibility analysis algorithm and creates the video monitoring systemcurrent synchronous tracking technology, and lays a foundation for the synchronization tracking algorithm of video visualization domain on forest fire prevention GIS.Secondly, it studies the synchronization tracking algorithm from different angles, including the relevant parameters of hardware in video monitoring system,the basic principles of synchronization tracking algorithm of video visualization domain,the solving model about visibility of camera rays and the solving model of visualization domain of lens.Thirdly, it designs and implements the synchronous tracking algorithm of video visualization domain. Through the experiment carried out in Lin'an Zhejiang, the experimental areas, on fire GIS application it shows that there is a close linkage between the simultaneous tracking algorithm and the camera angle, azimuth, focal length of lens in a particular moment.The thesis has two aspects of innovation. Firstly, it put forwards a kind of synchronous tracking algorithm of video visualization domain with relevant video surveillance equipment. Secondly, it achieves synchronous tracking software system of video visualization domain through the combination of video surveillance technology and professional GIS software. It solves the problem of video visualization domain which can not be displayed in fog and at night in video monitoring system, and thus it can be more effectively supportive to the forest fire prevention and decision-making. |
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