An efficient Multi-Directional Lossless Recompression for video coding systems

Video coding systems suffer from tremendous memory bandwidth requirement on external memory. This bandwidth is directly proportional to display resolution and frame rate. The aspiration of high-end visual quality drives display resolution and frame rate upgraded to a certain level. That also causes a design bottleneck on the memory bandwidth of external memory in video coding systems. In this paper, the Multi-Direction Lossless Recompression (MDLR) is proposed to alleviate above issue. It includes two core techniques: (1) Multi-Directional Prediction and (2) Direction-Adaptive Golomb-Rice code. The Multi-Directional Prediction can obtain an efficient residual. Then, Direction-Adaptive Golomb-Rice code converts it into an efficient codeword. The experiment result shows that the proposed MDLR can save the memory bandwidth of the video coding system as high as 42% on average.