Fully Digital Processing System Of Composite Video Signal

With the development of computer, digital signal processing technology is widely used in various fields. In the past, composite video processing is completed in analog way but in these days digital architecture is used for improving, assessing the quality of video signal and extending to more and more applications.The general digital decoding method for video is components digital, that first separate the incoming composite video signal into luminance and chrominance signals, such as YUV or YIQ, then digitize them separately and convert to RGB space. This paper is conducted to present a fully digital structure of a composite video signal processing system capable of optimize each module based on experimental results and the digital signal processing theory, and performing high quality from the overall adjustment. The major contents of this paper are as follows:First, summarize the basic structure, primary parameters and development status of video signal, expound the theory of video signal coding transmission and decoding reception, including image scan, color coding, signal compression, sync signal extracting and so on.Second, consider the further improvement of digital procession for video from auto-sync detection, self-adaptive Y/C separation, software digital PLL and so on. Moreover, assess the performance and feasibility of different methods from theoretical analysis and experimental results.Third, according as the processing effect, calculative speed, scope and internal relations between different arithmetic, this paper proposes an optimal digital video processing system that with good self-adaptability and apply to video signal of different features.Fourth, in order to test the system stability and judge the quality of the output image, this paper will try to evaluate the result of the processing system, and explore the evaluation of Image Resolution.