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18th Meeting: Teleconference, April 2020 2020-04-13 15:45
Alternative block size conditions for BDPCM
Authors: K. Unno KDDI K. Kawamura KDDI S. Naito KDDI Kyohei Unno
Abstract
This document is Draft 8 of a new ITU-T Recommendation and ISO/IEC International Standard entitled Versatile Video Coding. It has been developed by a joint collaborative team of ITU-T and ISO/IEC experts known as the Joint Video Experts Team (JVET), which is a partnership of ITU-T Study Group 16 Question 6 (known as VCEG) and ISO/IEC JTC 1/SC 29/WG 11 (known as MPEG). This draft new standard has been designed with two primary goals. The first of these is to specify a video coding technology with a compression capability that is substantially beyond that of the prior generations of such standards, and the second is for this technology to be highly versatile for effective use in a broadened range of applications. Some key application areas for the use of this standard particularly include ultra-high-definition video (e.g., with 3840×2160 or 7620×4320 picture resolution and bit depth of 10 or 12 bits as specified in Rec. ITU-R BT.2100), video with a high dynamic range and wide colour gamut (e.g., with the perceptual quantization or hybrid log-gamma transfer characteristics specified in Rec. ITU-R BT.2100), and video for immersive media applications such as 360° omnidirectional video projected using a common projection format such as the equirectangular or cubemap projection format, in addition to the applications that have commonly been addressed by prior video coding standards.
Meeting Notes
JVET-R0219 Alternative block size conditions for BDPCM [K. Unno, K. Kawamura, S. Naito (KDDI)]

In the last meeting, it was adopted that chroma BDPCM for 4:2:0 and 4:2:2 format. In the current spec, BDPCM applied CU can be separated into multiple TUs depending on the max transform skip size and the max TU size, in contrast with BDPCM applied CU always has only one TU in the VVC D7. In this contribution, it is proposed to change the block size condition of BDPCM. Two alternatives are proposed. Method 1 proposes to add a restriction that chroma BDPCM can be applied only if the CU is not separated into multiple TUs. Method 2 proposes to relax block size conditions that BDPCM can be applied regardless of separating CU to multiple TUs for not only chroma but also luma.
Experimental of Method 1 with CTC QPs show BD-rates for luma are ‑0.01%/0.02%/0.04% (AI/RA/LD) for Class F, ‑0.01%/‑0.02%/‑0.09% (AI/RA/LD) for Class TGM.
Experimental of Method 1 with Low QPs show BD-rates for luma are 0.00%/0.01%/‑0.01% (AI/RA/LD) for Class F, ‑0.02%/‑0.02%/‑0.01% (AI/RA/LD) for Class TGM.
Experimental of Method 2 with CTC QPs show BD-rates for luma are ‑0.09%/‑0.06%/0.13% (AI/RA/LD) for Class F, 0.01%/‑0.02%/0.03% (AI/RA/LD) for Class TGM.
Experimental of Method 2 with Low QPs show BD-rates for luma are‑0.02%/0.04%/‑0.04% (AI/RA/LD) for Class F, ‑0.02%/0.02%/‑0.09% (AI/RA/LD) for Class TGM.

During the discussion, it is pointed out that there is not a design problem, and it is also not asserted as inconsistent that for certain block sizes BDPCM is restricted for luma, but not for chroma.

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References:
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Cited:
JVET-R0011 JVET-R0419 X
ARCHIVE v3 :
JVET-R0219-v2.pdf JVET-R0219_BDPCM.docx JVET-R0219_Method1_CTCQP.XLSM JVET-R0219_Method1_LowQP.XLSM JVET-R0219_Method2_CTCQP.XLSM JVET-R0219_Method2_LowQP.XLSM JVET-R0219_spec_Method1_over_Q2001-vE.docx JVET-R0219_spec_Method2_over_Q2001-vE.docx
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