JVET-G0084 Luma/Chroma QP Adaptation for Hybrid Log-Gamma Sequences Encoding [K. Kawamura, S. Naito (KDDI)]

This contribution presents a study of luma/chroma QP adaptation for hybrid log-gamma sequences encoding. For PQ content, both luma QP adaptation and chroma QP offset is meaningful to improve the subjective quality. Similar approach is applied to the HLG content to study the subjective quality influence. Based on the subjective evaluation, luma QP adaptation provide negligible improvement while chroma QP offset provides significant improvement at the ultra-low bitrate range.

Subjective tests were not performed with exactly matching bit rates. Typically, the bit rate is higher.