| Along with the extremely developing of digital signal processing DSP, it is possible to implement videoand audio conveniently, on the other hand,the new video compressionStandard H.264 provide the proper means for communication.So it is significant to implement the H.264 CODEC on toDSP . Because the aim of JM model is to test the basic function of H.264 definition, the complexity of JM is too high to make a real product, even couldn't for realtime coding-decoding.So it. is important to optimize the CODE. H.264 employed the rate-distortion optimization(RDO) technique to select the best coding mode and reference frame for each macorblock.As a result,the computational burden of this type of brute force-searching algorithm is far more demanding than any existing video coding algorithm. The intra coding as an important part of H.264, the fast algorithm to it can significantly reduce the overall complexity.This paper have done five aspects to improve the H.264 code on the intra prediction,and launched the TI's TMS320DM643 Evaluation Board to achieve the H.264 standard encoder. In the Algorithm aspect, used the Methods such as model filtering, color brightness separate coding, the threshold value judgement, and other methods to improve the performance of intra prediction algorithm and Achieved good results.In the DSP achieving aspects sush as: launched the TI's TMS320DM643 Evaluation Board to achieve the H.264 standard encoder, transplanted the H.264 source code and have done the procedure-level optimization, Deleted out of the code which has nothing to do with the base class code, optimized the compiler settings options, Through the revision .Cmd files transferred the core sourse code gradually to the chip,collected a image and have done a format conversion,processed the encoded data, and tested it through decoding it. The results showed that the image quality is good after decoding,and the significant improvement is well. |
