Chapter 32 - Management System for Cameras' Video Data in Emergency

Abstract

In case of emergency, one needs to grasp the situation and make correct assessment quickly. The video data taken from the monitoring cameras are important information in emergency situations. In the research, a support system was built for identifying video data of monitoring cameras. The system collects video data from the net-cameras through the Internet and deals with them as spatio-temporal data. To search video data, an intuitive search method for users was proposed. In this method, a virtual wall in the city is assumed. This method allows users to search for the video data that is recorded during a period and records a virtual wall in a certain direction. The users set the above search-key on the map that is transformed to the search-key for the spatio-temporal access structure to proceed with the search. When the system shows the search result, the video data is displayed first. As the horizontal direction of the screen corresponds to the virtual wall's direction in the real world, the user can narrow down the search result in the horizontal direction of the screen.