Simplified rate-distortion optimized quantization for transform skip mode in VVC screen content coding

Jeeyoon Park; Jeehwan Lee; Byeungwoo Jeon

doi:10.1117/12.2669348

25 March 2023 Simplified rate-distortion optimized quantization for transform skip mode in VVC screen content coding

Jeeyoon Park, Jeehwan Lee, Byeungwoo Jeon

Proceedings Volume 12592, International Workshop on Advanced Imaging Technology (IWAIT) 2023; 125922K (2023) https://doi.org/10.1117/12.2669348
Event: International Workshop on Advanced Imaging Technology (IWAIT) 2023, 2023, Jeju, Korea, Republic of

Abstract

Rate-distortion optimized quantization for transform skip (RDOQ-TS) is shown to provide positive coding gain in VVC. This paper reduces encoding time-complexity of the RDOQ-TS scheme in VVC by adaptively skipping its level estimation (LE) process without sacrificing coding efficiency much. At first, the characteristics of each quantized level by RDOQ-TS are analyzed statistically. Subsequently, based on the statistical analysis, the LE process in the RDOQ-TS process is simplified by removing the case where the SQ (Scalar Quantization) value and the finally determined value are highly expected to be the same. For 4:2:0 screen content videos and 4:4:4 screen content videos, our proposed simplified rate-distortion optimization for transform skip reduces total encoding time respectively by 0.77% and 1.83% with no BDBR change under all intra configuration. In the case of the random access configuration, it achieves bit rate saving by -0.01 % and -0.03 % with total encoding time reduced 0.94% and 0.52% respectively.

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Jeeyoon Park, Jeehwan Lee, and Byeungwoo Jeon "Simplified rate-distortion optimized quantization for transform skip mode in VVC screen content coding", Proc. SPIE 12592, International Workshop on Advanced Imaging Technology (IWAIT) 2023, 125922K (25 March 2023); https://doi.org/10.1117/12.2669348

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