| dc.description.abstract | Owing to the rapid evolution of video coding techniques, video coding standards have been widely applied in many applications, such as MPEG-4 for streaming video on Internet and H.264/AVC for High Definition TV (HDTV). Many coding tools, including intra prediction, discrete cosine transform (DCT) and multi-reference frames (MRF) are further incorporated to improve coding efficiency. With these coding functions, great demands for computation resource and memory bandwidth are significantly increased. As the semiconductor have advanced into nano-scale technology, huge requirement of computing operation can be satisfied by proper design methodology, such as HW/SW co-design or dedicated hardware for acceleration. However, memory access operation still occupies a high percentage of whole computing profiling in H.264/AVC encoder. Therefore, memory bandwidth becomes a bottleneck in video coding systems. The embedded compression (EC) technology is widely applied to save frame memory size and bandwidth requirement.
For video coding system, the proposed EC algorithm mainly consists of three core techniques: side-oriented prediction, adjusted binary code and two-level rate control scheme. 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 reveal that 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.
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