Research On Video Security Improvement With Image Superimposition Technology

Now, Video monitor system is widely used in many application fields. But some special departments(such as customs,bank) are concerned about the exactness and reliability of remote monitoring image,especially the scene of a high-tech unit.This paper introduces a method to improve the security of video monitor system using superimposition technology. With MCU AT89C52, superimposition chip of MB90092 and pseudorandom characters superimposed, the action such as taking down the camera may be sensed by the system. When this long-distance monitor system is working, camera image may be obtained from it, superimposed icon may be cut and recognized with template matching method. If the icon is not matched with the characters of pseudorandom sequence, an alarm issued. If the tunnel is broken, the icons are not displayed on monitor until sending out a control signal from central monitor room. This system can effectively prevent the cheating action that deliberately imposed on terminal by hi-tech expert, so that it can guarantee the exactness and reliability of remote monitor image.In this dissertation, the designing blocks of the system, the circuit of each part and key programs are described.The whole system is achieved.