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16th Meeting: Geneva, October 2019 2019-09-25 00:00
AHG15: efficient coding of qp_out_val
Authors: F. Bossen Sharp Andrew Segall Sharp Frank Bossen
Abstract
The current VVC draft includes the ability to encode custom chroma QP mapping tables using a set of qpY and qpC pairs. Such pairs are delta coded as syntax elements delta_qp_in_val_minus1 and delta_qp_out_val. Two modified encodings of delta_qp_out_val are proposed. It is asserted that these modifications reduce the number of bits required to encode the mapping table by about 25-30% on average, while preserving a built-in constraint that restricts qpC to monotonically increase with qpY.
Meeting Notes
JVET-P0469 AHG15: efficient coding of qp_out_val [F. Bossen, A. Segall (Sharp)]

The current VVC draft includes the ability to encode custom chroma QP mapping tables using a set of qpY and qpC pairs. Such pairs are delta coded as syntax elements delta_qp_in_val_minus1 and delta_qp_out_val. Two modified encodings of delta_qp_out_val are proposed. It is asserted that these modifications reduce the number of bits required to encode the mapping table by about 25-30% on average, while preserving a built-in constraint that restricts qpC to monotonically increase with qpY.

See further notes under JVET-P0410.

Decision: Adopt JVET-P0469.

References:
JVET-O0433 JVET-O1166 JVET-P0410
Cited:
JVET-P0015 JVET-P0410 JVET-P2001 JVET-Q0002 JVET-Q0003 JVET-Q0041 JVET-Q0085 JVET-Q0097 JVET-Q0124 JVET-Q0125 JVET-Q0132 JVET-Q0148 JVET-Q0165 JVET-Q0168 JVET-Q0173 JVET-Q0175 JVET-Q0184 JVET-Q0185 JVET-Q0188 JVET-Q0199 more than 20
ARCHIVE v1 :
JVET-P0469-v1.docx
Decisions
adopted
Adopt JVET-P0469
Citation