METHOD AND APPARATUS FOR SIGNALING OF MAPPING FUNCTION OF CHROMA QUANTIZATION PARAMETER

WIPO Patent Application WO/2020/216376

A1

A method of obtaining a chrominance quantization parameter (QP) for chrominance components based on a luminance QP for luminance component, wherein the method is performed by a decoder, comprising parsing a received bitstream to obtain the luminance QP and information of a mapping function (f) which associates a QP index (QPi) to the chrominance QP (QPc); obtaining the QPi based at least in a part on the luminance QP; obtaining the mapping function based on the obtained information; and obtaining a QPc based on the obtained mapping function and the obtained QPi.

IKONIN SERGEY YURIEVICH (CN)
CHERNYAK ROMAN IGOREVICH (CN)
SOLOVYEV TIMOFEY MIKHAILOVICH (CN)
KARABUTOV ALEXANDER ALEXANDROVICH (CN)
ALSHINA ELENA ALEXANDROVNA (CN)
CHEN JIANLE (US)

PCT/CN2020/086933

October 29, 2020

April 26, 2020

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HUAWEI TECH CO LTD (CN)

H04N19/124; H04N19/186

CN105284112A	2016-01-27
CN107846591A	2018-03-27
EP3026908A1	2016-06-01

TAORAN LU; FANGJUN PU; PENG YIN; WALT HUSAK; SEAN MCCARTHY; TAO CHEN: "Chroma Quantization Parameter QpC Table for HDR Signal", 14. JVET MEETING; 20190319 - 20190327; GENEVA; (THE JOINT VIDEO EXPLORATION TEAM OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16 ), no. JVET-N0221, 12 March 2019 (2019-03-12), Geneva, CH, pages 1 - 6, XP030202704
SEETHAL PALURI ET AL.: "AHG15: Chroma Quantization QpC Parameter Signalling", JOINT VIDEO EXPERTS TEAM (JVET) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11, 15TH MEETING, 3 July 2019 (2019-07-03), Gothenburg, SE, XP030219181
See also references of EP 3949402A4

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