All Intra Main-tier
|
All Intra High-tier
|
All Intra Super-High-tier
|
|
Y
|
U
|
V
|
Y
|
U
|
V
|
Y
|
U
|
V
|
Overall 1A
|
0.0%
|
−0.1%
|
−0.1%
|
0.0%
|
−0.1%
|
−0.1%
|
0.0%
|
0.0%
|
0.0%
|
Overall 1B
|
−0.1%
|
−0.1%
|
−0.1%
|
−0.1%
|
−0.1%
|
−0.1%
|
0.0%
|
−0.1%
|
−0.1%
|
Overall 2A
|
0.1%
|
0.1%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
Overall 2B
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
Overall 3A
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
Overall 3B
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
0.0%
|
It was commented that there are adverse implications to adjusting MDCS for the chroma angle (rather than using the luma mode).
Experts asked for time to consider the implications of this proposal and the related contributions M0138, M0156, M0232. It would be desirable if a summary table expressing all the many options could be produced.
(Further discussion in BoG M0462 chaired by D. Flynn.)
After further analysis, the BoG recommended chroma mode mapping M0127 method 1b was suggested for adoption.
Decision: Adopt chroma mode mapping M0127 method 1b.
JCTVC-M0372 AHG5: Cross-check on Unified intra prediction angles for 4:2:2 chroma format (JCTVC-M0127) [A. Minezawa, S. Sekiguchi (Mitsubishi)] [late] [miss]
Crosschecked 1A, 1B, 2B, 3A, 3B.
JCTVC-M0383 Cross-check of proposal ‘AHG5: Unification of chroma intra prediction angles between 4:2:2 chroma format’ (M0127) by JVC Kenwood [C. Rosewarne, M. Maeda (Canon)] [late]
Crosschecked 1A and 2A. Matches. Agrees that the "new" 4:2:2 directions should be removed, but should also consider the impact of the WD text. All of these involve a new table.
Method *B was not checked.
Does not see any benefit to modifying MDCS.
Intra -> DM -> Adj -> Angle
See notes on M0127.
JCTVC-M0138 AHG5: On chroma intra prediction for 4:2:2 [C. Rosewarne, M. Maeda (Canon)]
Option (1a) of M0127 performs identically to the preferred option (2) of M0138.
Intra -> DM -> AngleAdj
See notes on M0127.
JCTVC-M0424 Cross-check of chroma intra prediction for 4:2:2 (JCTVC-M0138) [J. Sole (Qualcomm)] [late]
JCTVC-M0156 AHG5: Simplification of chroma intra prediction process for YUV4:2:2 coding [A. Minezawa, S. Sekiguchi, T. Murakami (Mitsubishi)]
See notes on M0127.
JCTVC-M0409 Cross-check of simplified chroma-intra-prediction process for YUV4:2:2 coding (JCTVC-M0156) [K. Kawamura, S. Naito (KDDI)] [late]
JCTVC-M0232 AHG5: Intra Prediction Mode-Dependent Coefficient Scanning for 4:2:2 Chroma Extended Format [Z. Chen, S. Liu, S. Lei (MediaTek)]
For chroma in 4:2:2 MDCS, Changes the range limits for deciding H|V scans.
Roughly the same performance.
See notes on M0127.
JCTVC-M0368 Cross-check of Intra Prediction Mode-Dependent Coefficient Scanning for 4:2:2 (JCTVC-M0232) [J. Sole (Qualcomm)] [late]
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