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引用次数: 1
摘要
视频编码系统对外部存储器的带宽要求非常高。该带宽与显示分辨率和帧速率成正比。对高端视觉质量的追求带动了显示分辨率和帧率的提升。这也导致了视频编码系统外部存储器带宽的设计瓶颈。本文提出了多方向无损再压缩(Multi-Direction loss - less Recompression, MDLR)技术来解决上述问题。它包括两个核心技术:(1)多向预测和(2)方向自适应Golomb-Rice码。多方向预测可以获得有效的残差。然后，方向自适应Golomb-Rice码将其转换为有效码字。实验结果表明，该算法可为视频编码系统平均节省高达42%的存储带宽。
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.
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