The Design Of Automobile-mounted Monitoring System And Video Acquisition

As the development of electronic technology and road traffic, more and more electronic equipments are used in automobiles. Automobile-mounted monitoring system is widely used nowadays. Car rear monitoring system can eliminate the visual blind spots, so that the driver is aware of rear vehicles and traffic accidents that may occur. Monitoring system in front of car can provide the driver wider perspective and makes driving safer. Monitoring system in bus provide driver the situation inside bus and makes driving conveniently. Automobile-mounted Monitoring System can largely improve the safety and comfort of driving.Automobile-mounted monitoring system includes many aspects, such as video acquisition, storage and display. Black-and-white analog camera is used to get analog video signals. Then, the signals are changed into digital signals by decoder. Digital signals are stored by frame with the control of FPGA. Subsequently, DSP read digital signals to process and then store them. Finally, with the control of FPGA, the processed video signals are sent to LCD to display.Firstly, video monitoring technology is presented in this thesis. Then, the whole structure and the system flow are given. On the basis of the whole system, the realization of hardware and software of video acquisition are described: Hardware design of the power modules, decoder circuit and the connection of decoder and control chip; DSP simulating IIC protocol for decoder setting, the flow of video acquisition, the output of video signals and synchronous signals. Finally, on the basis of the analysis of automobile-mounted electronic equipment interference, several feasible anti-jamming measures are given. Testing shows that the design is right and feasible, realizes the acquisition of video signals and meets the requirements of video monitoring.