JCTVC-O0314 Cross-check of JCTVC-O0259 on supporting higher bit-depth with transform skip only changes [S. Lee, C. Park, C. Kim (Samsung)] [late]
6.1.9Other aspects relating to high bit depth (6)
JCTVC-O0090 AhG 5 and 18: High Bit-depth Coding Using Auxiliary Picture [W.-S. Kim, W. Pu, J. Chen, Y.-K. Wang, J. Sole, M. Karczewicz (Qualcomm)]
(Reviewed Thu 24th evening GJS)
In this contribution a method to code a high bit-depth source is proposed, where the input is divided into MSB part and LSB part. The MSB part is coded as a primary picture and the LSB picture is coded as an auxiliary picture. An SEI message is proposed to combine the MSB and LSB parts. It is asserted that the high bit-depth input can be effectively coded using the proposed method with implementations that do not support high-precision extensions.
The scheme separates the MSB and LSB part of the signal into separate coded video planes, possibly with some overlap of which bits are put into which plane.
The MSB part could be coded as 8 bit, or with some higher bit depth, but not the full bit depth, and the LSB part would be a supplemental signal for those decoders that would decode it.
No experiments had been done.
The possibility of making the "LSB" part a residual coded signal was suggested. That wasn't tried.
The similar N0142 of the previous meeting was noted as very similar, and at that time it was noted that the MSBs must be lossless for the LSBs to be useful (without overlap or a residual coding approach).
No action.
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