A bandwidth-efficient embedded compression algorithm using two-level rate control scheme for video coding system

In modern video coding system, the memory bandwidth of external memory becomes more and more important and almost dominates the system performance. To save the memory bandwidth, the embedded compression (EC) technique is integrated into video coding system. In this paper, the bandwidth-efficient EC algorithm is proposed. It comprises three core techniques: side-oriented prediction, adjusted binary code (ABC) entropy coding, and two-level rate control scheme. The side-oriented prediction can save the extra bits for the representation of prediction residual. The prediction residual is allocated to an efficient codeword by ABC entropy coding. With two-level rate control scheme, not only the compression ratio (CR) can be precisely controlled, but also the visual quality is maintained. Experiment results show this work achieves the PSNR drop of 1.33%, and the error between CR and Target CR (TCR) is as minor as 1.60%. Consequently, this work is quite suitable for saving memory bandwidth in video coding system.