Spectral-PQ: A Novel Spectral Sensitivity-Orientated Perceptual Compression Technique for RGB 4:4:4 Video Data
Lee Prangnell, Victor Sanchez

TL;DR
Spectral-PQ is a new perceptual video compression method that leverages human spectral sensitivity to reduce bitrate significantly while maintaining perceptually lossless quality in RGB 4:4:4 videos.
Contribution
It introduces Spectral-PQ, a novel spectral sensitivity-based perceptual quantization technique operating at the CB and PU levels in HEVC, reducing bitrate without quality loss.
Findings
Bitrate reduction up to 81% compared to HEVC baseline.
Achieves perceptually lossless quality as per subjective MOS evaluations.
Effectively exploits spectral sensitivity, spatial, and temporal masking in RGB video compression.
Abstract
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…
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Taxonomy
TopicsColor Science and Applications · Image Enhancement Techniques · Image and Video Quality Assessment
