The Video Image Digital Overlapping Technology Based On The DSP Technology

The video detection technology gets an extensive application in the measure field of modern industrial production, and the video image-overlapping technology plays an important role in the video detection system.This thesis designs a video image-overlapping system that takes DSP as the central processor. The whole system includes video capture module, pre-processing module, video A/D module, FPGA interface module, DSP processing module, video D/A module, LCD display module and power supply module. The video capture module collects analog video signal. The pre-processing module processes and amplifises the analog video signal. The video A/D module converts the analog video signal into digital video signal. The FPGA interface module stores the digital video signal. The DSP processing module overlaps characters and graphics into the image digitally. The video D/A module converts the digital video signal into analog video. The LCD display module displays the video. The power supply module supplies power to the whole system.This thesis detailedly introduces the work principle, software and hardware design of every module in the system. The system has been examined through an experiment, and the experiment was a good result. In the end, the thesis summarises and prospects the video image-overlapping technology, and puts forward next work.