The Improved AVS Intra Prediction Algorithm

Abstract

AVS introduces intra-prediction coding technique to improve the intra-coding efficiency. There are 5 candidate modes for luminance intra-prediction and 4 candidate modes for chrominance. The method of intra prediction for the current video coding standard mainly uses the pixels of the left, the top, the upper right neighboring blocks, and doesnt use the pixels of the right and bottom blocks. It is not because there is low correlation between the current block and the right and bottom blocks, but the right and bottom blocks need to refer to the data of current block to decode the display. If the mode of the right block is the vertical mode, it can use the data of right block to predict the current block and a new prediction mode of mean-left-right is presented, and if the mode of the bottom block is the horizontal mode, it can use the data of bottom block to predict the current block and a new prediction mode of mean-top-bottom is presented. The corresponding adjustment is implemented for AVS encoder and decoder. Experimental results show that the PSNR increases about 0.03db and the coding bit rate decreases by about0.73% with small complexity increasing.