JCTVC-M0345 Cross-check for bandwidth reduction for range extension [E. Alshina, S. Lee, J. Min] [late]
JCTVC-M0335 AhG5: Offset Scaling in SAO for High Bit-depth Video Coding [W.-S. Kim, J. Sole, M. Karczewicz (Qualcomm)]
(Initially reviewed in BoG M0462 Wed. p.m. chaired by C. Rosewarne.)
Notes from BoG report to be integrated.
The bit depth of the SAO offset value was studied and two possible modifications were proposed.
Related to M0118.
The BoG recommended adoption of the first (simpler) modification and further study were recommended in the initial discussion.
The gain for IBDI for 8 bit content coding, relative to using 8 bit coding, had previously been observed to decrease as coding bit depth increased beyond 10 bits when not applying the modification. With the modification, the gain became roughly constant beyond 10 bits, which is the same behaviour observed with SAO disabled. Thus the proposed scheme was characterized as a fix to undesirable behaviour.
Decision: Adopted the first (simpler) modification as recommended by BoG.
Post-meeting note: M0335 had an unforeseen relationship with a big fix (ticket #1082: Missing left shift on offset in merge evaluation in SAO) and its consideration was deferred to the next meeting.
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