论文标题
Spectral-PQ：RGB 4：4：4视频数据的新型光谱敏感性感知压缩技术
Spectral-PQ: A Novel Spectral Sensitivity-Orientated Perceptual Compression Technique for RGB 4:4:4 Video Data
论文作者
论文摘要
人类视觉系统（HVS）的光谱灵敏度与色彩感知之间存在固有的关系。在感知压缩研究中，这些相互交织的现象经常被忽略。通常，大多数先前提出的视觉无损压缩技术利用了亮度（LUMA）掩蔽，包括Luma时空遮罩，LUMA对比度掩盖和Luma纹理/边缘掩模。图片中颜色的感知相关性通常被忽略，这构成了文献中的差距。关于HVS的光谱灵敏度现象，RAW RGB 4：4：4的颜色通道包含重要的基于颜色的心理冗余。这些感知冗余可以通过颜色通道级别的感知量化进行量化。在本文中，我们提出了一种新型时空无视觉上的无损编码方法，称为光谱感知量化（Spectral-PQ）。随着RGB 4：4：4视频数据的应用，Spectral-PQ利用HVS光谱敏感性相关的颜色遮罩除了空间掩盖和时间掩模之外；所提出的方法在HEVC标准中的编码块（CB）级别（CB）级别（PU）级别运行。如果检测到G，B和R CBS中的高方差空间数据，并且如果检测到PUS中的高运动矢量幅度，则Spectral-PQ感知在CB水平上调节量化步长（QSTEP）。与锚固1（HEVC HM 16.17 REXT）相比，光谱-PQ大大降低了比特率，最大降低约为81％。主观评估中的平均意见评分（MOS）表明，光谱PQ成功地实现了无损的质量。
There exists an intrinsic relationship between the spectral sensitivity of the Human Visual System (HVS) and colour perception; these intertwined phenomena are often overlooked in perceptual compression research. In general, most previously proposed visually lossless compression techniques exploit luminance (luma) masking including luma spatiotemporal masking, luma contrast masking and luma texture/edge masking. The perceptual relevance of color in a picture is often overlooked, which constitutes a gap in the literature. With regard to the spectral sensitivity phenomenon of the HVS, the color channels of raw RGB 4:4:4 data contain significant color-based psychovisual redundancies. These perceptual redundancies can be quantized via color channel-level perceptual quantization. In this paper, we propose a novel spatiotemporal visually lossless coding method named Spectral Perceptual Quantization (Spectral-PQ). With application for RGB 4:4:4 video data, Spectral-PQ exploits HVS spectral sensitivity-related color masking in addition to spatial masking and temporal masking; the proposed method operates at the Coding Block (CB) level and the Prediction Unit (PU) level in the HEVC standard. Spectral-PQ perceptually adjusts the Quantization Step Size (QStep) at the CB level if high variance spatial data in G, B and R CBs is detected and also if high motion vector magnitudes in PUs are detected. Compared with anchor 1 (HEVC HM 16.17 RExt), Spectral-PQ considerably reduces bitrates with a maximum reduction of approximately 81%. The Mean Opinion Score (MOS) in the subjective evaluations show that Spectral-PQ successfully achieves perceptually lossless quality.
