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首页> 外文期刊>Journal of visual communication & image representation >Rate-distortion-smoothness optimized rate allocation schemes for Spectral Fine Granular Scalable video coding technique
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Rate-distortion-smoothness optimized rate allocation schemes for Spectral Fine Granular Scalable video coding technique

机译：频谱细粒度可扩展视频编码技术的速率失真平滑度优化速率分配方案

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摘要

Spectral Fine Granular Scalability (SFGS), a variation of MPEG-4 FGS, is proposed in this paper as a scalable coding technique for video streaming. SFGS re-arranges enhancement-layer bit-plane data according to spectral frequency orderings before they are further processed with traditional FGS bit-plane coding technique. Based on this data reordering within each bit-plane, spectral bands of lower frequency or higher rate-distortion properties are transmitted with priorities. In spite of this modification, SFGS retains similar properties as FGS, such as the coding efficiency, error resilience, and adaptation to channel bandwidth variation. However, SFGS is promising in yielding evener image quality and smoother video perception at the receiver side when the channel bandwidth is limited. Traditional FGS rate control techniques lack a systematic approach to making tradeoffs between image quality, motion smoothness (i.e., the frame rate), and video smoothness (PSNR difference between consecutive frames), according to limitations on system resources and users' preferences. In view of this drawback, we propose here a unified rate allocation scheme, based on rate-distortion-smoothness optimization criterion and multi-stage dynamic programming (DP) technique, to solve the above problems. Experiments show that our algorithm is capable of achieving a smoother video quality, and simultaneously guaranteeing no buffer overflow and underflow at encoder/decoder, under a target bit-rate constraint. Though our proposed algorithm was designed for SFGS, it can be also applied to other FGS variations.
机译：本文提出了频谱精细粒度可扩展性（SFGS），它是MPEG-4 FGS的一种变体，作为视频流的可扩展编码技术。 SFGS根据频谱频率顺序重新排列增强层位平面数据，然后再使用传统的FGS位平面编码技术进行进一步处理。基于每个位平面内的数据重新排序，优先发送低频率或高速率失真特性的频谱带。尽管进行了这种修改，但SFGS保留了与FGS类似的属性，例如编码效率，错误恢复能力以及对信道带宽变化的适应性。但是，当通道带宽受到限制时，SFGS有望在接收器端产生更均匀的图像质量和更流畅的视频感知。根据系统资源和用户偏好的限制，传统的FGS速率控制技术缺乏一种系统的方法来权衡图像质量，运动平滑度（即帧频）和视频平滑度（连续帧之间的PSNR差异）。鉴于此缺点，我们在此提出一种基于速率失真平滑度优化准则和多级动态规划（DP）技术的统一速率分配方案，以解决上述问题。实验表明，在目标比特率约束下，我们的算法能够实现更流畅的视频质量，并同时保证在编码器/解码器中没有缓冲区上溢和下溢。尽管我们提出的算法是针对SFGS设计的，但也可以应用于其他FGS变体。

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