Research Of H.264 Video Coding And Optimation Based On DM642

Along with the social various aspects fast development, the network video supervisory system is more and more higher in the industrial production, national security and daily life. While there, at present, are many technical difficulties in network video communication instantaneity and definition etc. at the same time, the monitor and control system's abroad application bring forward to the higher request in the cost, the voice of substitute PC with embedded system become higher and higher, therefore, there has the widespread application prospect and the practical value in this aspect research.H.264 is the new generation of video frequency compression code standard which (JVT) formulates by the union video frequency group. Its not only saved 50% code rate compared to H.263 and MPEG-4, moreover has the better support function to the network transmission. This transmits the multimedia information to the present Internet to have the vital significance.TMS320DM642 is section which TI Corporation promotes in view of multimedia processing domain application DSP, it in the C64x foundation, increased the very many auxiliary equipment and the connection, is embedded video system design the first choice.This thesis has carried on the thorough analysis to the H.264 video code technology, profits from the domestic and foreign outstanding algorithms the experience, proposed in one kind of improvement frame the predictive coding algorithm, enhances H.264 the coding efficiency, the improvement network correspondence instantaneity question. Front meanwhile completes video processing using DM642, this design has the application prospect of the video supervisory system.This research achievements and innovation as follows:The H.264 protocol algorithm optimization is a technical difficulty. In view of the intra prediction algorithm is far calculated characteristic, which proposed in one kind of improvement to the intra prediction pattern choice algorithm, and the use of the simplifies rate distortion optimization function judgment method to reduce the complex in intra prediction. This algorithm does not affect the original picture quality in the foundation but enhance the encoded operation time.Considered the partial C language procedure after transplants into DSP to be able affects the hardware environment as a result of in the construction of data and the procedure structure difference the operating efficiency, therefore this chapter has designed with the hardware union close assembly language procedure, the assembly language will replace the partial C language to realize the algorithm.Using completely aims at C6000 the series DSP development the linear assembly algorithm to optimize finally transplants into the hardware the procedure also is the article innovation spot. The linear assembly algorithm full has used the DSP hardware superiority, greatly enhances the entire procedure operating efficiency, and saves the code time.The experiment indicated that, the optimized algorithm enhanced the intra prediction algorithm efficiency, unified the DSP hardware system assembly rewriting and the linearity assembly program also greatly enhanced the code efficiency.