6.1.1General
See also M0094 (on requirements / profiles).
JCTVC-M0178 AHG5: Range Extensions and High Bit Depths [K. Sharman, N. Saunders, J. Gamei (Sony)]
(Initially reviewed in BoG M0462 Wed. p.m. chaired by D. Flynn.)
The contribution contained a thorough study of various aspects. Extended precision of internal processing elements was suggested in the contribution.
It was noted that using a fixed precision expansion width would seem preferable (e.g. based on profile/level).
Some bit depth expansion phenomena were reported and a modification of the entropy coding was proposed to handle this (with dependencies on QP). Benefit from sign data hiding was reported to be negligible.
Throughput was analyzed and a modification of bypass bin handling was proposed to establish alignment with the bits coded in the bitstream.
Some benefits were reported for 14 bits as well as higher precision.
Profiling was discussed in the contribution, but this aspect was not discussed in detail by the group as there was other input on that and further study was understood to be needed about this.
Notes from BoG report to be integrated.
Further study in AHG was requested.
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