5.9.2.6SAO type
JCTVC-J0045 AhG6: On SAO type sharing between U and V components [E. Alshina, A. Alshin, J.H. Park, (Samsung), G. Laroche, C. Gisquet, P. Onno, (Canon)]
This contribution proposes to share SAO type, merging left and merging up flags between U and V color components. The number of context coded bins for SAO syntax is reportedly reduced by 36% with suggested modifications (which is 1.2% total amount of context coded bins reduction). In addition, this simplification respectively provides 0.2%, 0.2% and 0.3% Luma BD-rate gain with LCU sizes of 64x64, 32x32 and 16x16. It is asserted that proposed change simplifies memory access during simultaneous processing of U and V components and helps for efficient SAO implementation.
Shares type, merge left and merge up for the two color components.
Difference compared to J0355: In J0335 [Ed. J0355?], merge is also shared for luma, but it allows different types for the two chroma components
Various things would be interesting to test in combination with J0355:
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share merge only between chroma components
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share merge between luma and chroma, and additionally share type between chroma comp.
Decision: Adopt.
JCTVC-J0467 AhG6: Verification of J0045 on SAO chroma processing [F. Bossen (DOCOMO Innovations)]
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