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There is an increasing consumer demand for high bit-depth 4:4:4 HD video dataplayback due to its superior perceptual visual quality compared with standard8-bit subsampled 4:2:0 video data. Due to vast file sizes and associatedbitrates, it is desirable to compress raw high bit-depth 4:4:4 HD videosequences as much as possible without incurring a discernible decrease invisual quality. In this paper, we propose a Coding Block (CB)-level perceptualvideo coding technique for HEVC named Full Color Perceptual Quantization(FCPQ). FCPQ is designed to adjust the Quantization Parameter (QP) at the CBlevel (i.e., the luma CB and the chroma Cb and Cr CBs) according to thevariances of pixel data in each CB. FCPQ is based on the default perceptualquantization method in HEVC called AdaptiveQP. AdaptiveQP adjusts the QP of anentire CU based only on the spatial activity of the constituent luma CB. Asdemonstrated in this paper, by not accounting for the spatial activity of theconstituent chroma CBs, as is the case with AdaptiveQP, coding performance canbe significantly affected; this is because the variance of pixel data in a lumaCB is notably different from the variances of pixel data in chroma Cb and CrCBs. FCPQ, therefore, addresses this problem. In terms of coding performance,FCPQ achieves BD-Rate improvements of up to 39.5% (Y), 16% (Cb) and 29.9% (Cr)compared with AdaptiveQP.

Coding Block-Level Perceptual Video Coding for 4:4:4 Data in HEVC