一种用于帧内速率控制的自适应位错校正算法

C. Sheng, Fen Chen, Zongju Peng, Weiguo Chen
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引用次数: 2

摘要

速率控制是高保真视频编码的重要组成部分。自第一次征求建议以来,许多速率控制算法已被纳入HEVC标准,为其未来的实际应用做准备。基于最先进的SATD帧内速率控制策略(SATDRC)实现了稳定的控制性能。但是,帧级(BMF)的平均比特失配达到0.62%,最高的达到1.47%,在带宽受限的应用中可能导致视频业务不稳定。本文提出了一种用于SATDRC的自适应帧级位错配校正方案(AFBMR),以减小分配位与生成位之间的间隙。利用BMF根据序列特征自适应地调整分配给帧的位。实验结果表明,该方法平均减少了37.33%的比特不一致性,提高了比特率精度,提供了更稳定的比特流,而不会带来额外的计算复杂度和视频质量损失。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An adaptive bit mismatch rectification algorithm for intra frame rate control in HEVC
Rate control is an integral part of high-fidelity video coding. Since the first call for proposal, many rate control algorithms have been incorporated into the HEVC standard to prepare for its practical use in the future. The state of the art SATD based intra frame rate control strategy (SATDRC) achieves stable controlling performance. However, the average bit mismatch on the frame level (BMF) reaches 0.62%, with the highest 1.47%, which may lead to unsteady video services in bandwidth constrained applications. In this paper, an adaptive frame level bit mismatch rectification scheme (AFBMR) is proposed for SATDRC to reduce the gap between allocated bits and generated bits. BMF is utilized to adjust bits allocated to a frame adaptively in accordance with sequence characteristics. Experimental results show that the proposed method reduces bit inconsistency by 37.33% on average, enhancing bit rate accuracy as well as providing steadier bit streams without introducing extra computational complexity and loss of video quality.
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