Optimization Of Predictive Coding Algorithm In Video Coding

With the development of video in the direction of high resolution,high frame rate and real-time performance,a high-performance video encoding standard HE VC(High Efficiency Video Coding)has emerged.Compared to H.264/AVC,HEVC incorporates many new techniques in the context of joint coding,especially in predictive coding.The addition of new technology has greatly increased the accuracy of video coding,but also brought a lot of computational pressure.Prediction algorithm is divided into inter prediction and intra prediction,because HEVC CU size and PU mode selection more,so in the prediction process takes a lot of time.In order to improve the efficiency of coding,this paper first proposed the concept of two-level predictive coding process from the coding structure.Secondly,in the first-level predictive coding process,by downsampling the image and skipping sub-pixel search,Finally,by comparing a large number of experimental data,the data obtained in the first stage is processed according to certain principles.In the second stage of prediction,only the part of the CU is divided into the PU mode traversal.On the one hand,the two-stage predictive coding algorithm can reduce coding time by 40%by macroscopically optimizing the entire coding process;on the other hand,the quality of video coding can be controlled within 5%through reasonable and comprehensive selection criteria.Finally,the algorithm has strong sequence adaptability,and also has a good optimization effect on the video sequence with high complexity and intense motion.Therefore,the proposed optimization algorithm has a high practical value and research reference value.