The Algorithm Analysis Of Video Post-processing Of STB

With the development of technology, digital video begin access common people's view from lab and some special fields. DVB is the symbol of this development. As the DVB transitional product ---STB have very large market.This paper analyze the technology of video processing in STB, and the emphasis is putted on the interlaced algorithm of video post-processing. In this article ,the STB scheme based on STi5518 chip and the video post-processing methods be introduced. And then, expatiate the digital video and analog video elements and several factors that can affect the video definition. Aiming at the present condition of STB video post-processing, analyze the video post-processing algorithms which include sampling conversion, de-interlace and frame rate up-conversion. This article mainly analyze de-interlace algorithm, for motion-compensated de-interlace algorithm give a new method. This method aimed at avoiding the limitation of liner de-interlace and motion adaptation de-interlace algorithm, and put emphases on image detail protection and noise elimination, at the same time consider the cost of hard ware and operation spending. The first step of this method is in the motion-detection unit, we add an adaptation median filter in order to protect image details and eliminate noise, so the motion-detection result more precise. The second step is that adopting bidirectional block matching motion-estimation ,this way can get more exact motion-vector, at the same time can reduce the operation spending and improve robust. The last step is de-interlacing. The result of software emulation prove that this method can protect image details and improve video definition in theory. The fifth chapter expatiate the resolve method of false code during the video processing. The emphasis is put on the false code resolve method in video post-processing. These methods are adopted in many video processing chips include STi5518.At the end of this article, give an expectation of video post-processing in STB, and for the realization of my method give a plan.