Perceptual Optimization for Scalable Video Compression Based on Visual Masking Principles
Perceptual Optimization for Scalable Video Compression Based on Visual Masking Principles
复制标题
基于视觉掩蔽原理的可扩展视频压缩感知优化
DOI：
10.1109/tcsvt.2009.2017078
复制
发表时间：
2009
影响因子：
8.4
通讯作者：
D. Taubman
中科院分区：
文献类型：
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作者：
Raymond W. T. Leung;D. Taubman
本文描述了一种可伸缩视频压缩的视觉优化策略。可伸缩编码所面临的挑战是，嵌入式码流的截断可能会导致可变的和高度可见的失真。为了克服视觉无损编码方案的不足之处，我们建议使用自适应掩蔽斜率来模拟分辨率和比特率缩放引起的阈上失真的感知影响。这样可以更好地保存重要的场景结构。根据视觉掩蔽原理，在每个帧内评估对失真的局部敏感性。为了保持对时空误差的感知响应均匀，我们减轻了在时间合成期间由运动场复合的误差。视觉灵敏度权重通过称为感知映射的过程沿着沿着运动轨迹被投影到子带域。这使用误差传播路径来捕获归因于运动补偿变换的一些噪声整形效应。一个关键的观察是，视频中的低对比度区域通常更容易受到量化误差的暴露。所提出的方法提高了与这些关键区域相关联的失真长度斜率，改变比特流嵌入顺序，使得视觉敏感的站点可以以更高保真度编码。主观评价表明，感知改善比特率，空间和时间的可伸缩性。
This paper describes a visual optimization strategy for scalable video compression. The challenge scalable coding presents is that truncation of an embedded codestream may induce variable and highly visible distortion. To overcome the deficiencies of visually lossless coding schemes, we propose using an adaptive masking slope to model the perceptual impact of suprathreshold distortion arising from resolution and bit-rate scaling. This allows important scene structures to be better preserved. Following visual masking principles, local sensitivity to distortion is assessed within each frame. To keep the perceptual response uniform against spatiotemporal errors, we mitigate errors compounded by the motion field during temporal synthesis. Visual sensitivity weights are projected into the subband domain along motion trajectories via a process called perceptual mapping. This uses error propagation paths to capture some of the noise-shaping effects attributed to the motion-compensated transform. A key observation is that low contrast regions in the video are generally more susceptible to unmasking of quantization errors. The proposed approach raises the distortion-length slope associated with these critical regions, altering the bitstream embedding order so that visually sensitive sites may be encoded with higher fidelity. Subjective evaluation demonstrates perceptual improvement with respect to bit-rate, spatial and temporal scalability.
影响因子：
--
作者：
LEGGE, GE;FOLEY, JM
通讯作者：
FOLEY, JM