Research And Application Of Video Compression And Coding

With the techniques of multimedia and network have been rapidly developed andwidely applied in our society,it is becoming more and more convenient and quick forus to store,process and transmit digital multimedia signals.On the one hand,it is possible for the information makers to design their real time video codec systemsbased on common or dedicated processors under the capability development of those kinds of processors,on the other hand,the appearance of new video standards has showed that larger compression ratio demands more and more computation.In order to improve the performance of the coder,the MPEG-2 and MPEG-4 standards use motion compensation techniques based on fixed or variable block sizes,which bringsthe problem of increasing complexity and computation,and also,brings the challenge of implementing such real time video codec systems.1.The researching trends and current evolvement of the video compression/decompression standards are investigated,and then the basic theory of videocompression and the main technology algorithms in the current video compression/decompression standards are introduced. Motion Estimation(ME) compensation algorithm is the key module in video encoding.There are many ways to realize Motion Estimation,in general,it's considered as the most flexible module in video encoding2.In this paper,according to the fact of video CODEC in our application,a fast Motion Estimation algorithm is design by this paper after the trade-off is made between encoding performance and processing speed,after that,many experiences are finished to prove and verify rationality of the algorithm in Motion Estimation.3.Finally,we implement the H.264/AVC encoder software performance under C Lang..Then we find out the bottlenecks in the encoder codes.Combined with the algorithm feature of H.264/AVC standard,we eventually design a kind of effective software architecture for the encoder.Further more,by using some DSP platform optimization technology,the H.264/AVC encoder we design runs in real-time.Finally, based on DM642 EVM,I design a optimized hardware platform.