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Due to the increasing prevalence of high bit depth and YCbCr 4:4:4 videodata, it is desirable to develop a JND-based visually lossless coding techniquewhich can account for high bit depth 4:4:4 data in addition to standard 8-bitprecision chroma subsampled data. In this paper, we propose a Coding Block(CB)-level JND-based luma and chroma perceptual quantisation technique for HEVCnamed Pixel-PAQ. Pixel-PAQ exploits both luminance masking and chrominancemasking to achieve JND-based visually lossless coding; the proposed method iscompatible with high bit depth YCbCr 4:4:4 video data of any resolution. Whenapplied to YCbCr 4:4:4 high bit depth video data, Pixel-PAQ can achieve vastbitrate reductions, of up to 75% (68.6% over four QP data points), comparedwith a state-of-the-art luma-based JND method for HEVC named IDSQ. Moreover,the participants in the subjective evaluations confirm that visually losslesscoding is successfully achieved by Pixel-PAQ (at a PSNR value of 28.04 dB inone test).

Visually Lossless Coding in HEVC: A High Bit Depth and 4:4:4 Capable JND-Based Perceptual Quantisation Technique for HEVC