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17th Meeting: Brussels, January 2020 2020-01-13 12:58
CE5-related: JC-CCALF with Alternative Filter Weight
Authors: Che-Wei Kuo Panasonic Jingxin Li Panasonic Chong Soon Lim Panasonic LI JINGYA
Abstract
This document is Draft 7 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-Q0125 CE5-related: JC-CCALF with Alternative Filter Weight [C.-W. Kuo (Panasonic)]

This contribution was further reviewed in Track B Monday 13 January at1330 (chaired by JRO).

In this contribution, it is proposed to use individual JC-CCALF filter weight for each alternative filter. Specifically, instead of using various weight values as in JC-CCALF, only sign changes are applied for 4 alternative filters, e.g., + − − +. In decoder, the current CTU selects the filter weight according to the parsed alternative filter index. Compared to the JC-CCALF in CE5-3.2, a coding gain improvement and negligible runtime change are reported.

Simulation results with joint YUV performance (AHG13 8:1:1 metric) are summarized as follows.

All Intra

Random Access

Low Delay B

Y

U

V

YUV

Y

U

V

YUV

Y

U

V

YUV

CCALF (CE5 anchor)

0.17%

-8.31%

-7.06%

-1.40%

0.14%

-10.14%

-9.82%

-1.88%

0.12%

-13.00%

-9.48%

-2.15%

JC-CCALF (CE5-3.2)

0.10%

-5.84%

-4.87%

-0.99%

0.16%

-8.63%

-8.27%

-1.56%

0.12%

-12.71%

-9.47%

-2.12%

Alternative filter weight

0.10%

-6.65%

-5.56%

-1.14%

0.15%

-9.39%

-9.16%

-1.74%

0.11%

-13.03%

-10.11%

-2.22%

The gain comes from two aspects: Replacing the weight by +/−1 (sign), the gain comes mainly from saving bits for signalling. In total, there are less options for weighting, but more options for the joint filter. The adopted option from CE5-2.1 still has more options for the filters, and the new proposal still is less well performing. The complexity of the adopted proposal is not a real concern, and the approach proposed here appears to have some more irregularity.

No action was taken on this.

References:
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Cited:
JVET-Q0025 JVET-Q0585 X JVET-Q0780
ARCHIVE v4 :
JVET-Q0125-v1.docx JVET-Q0125.pptx JVET-Q0125.xlsm JVET-Q0125_CE5-3.2_CE5-Anchor_JVET-P2001-vE.docx JVET-Q0125_Combined_Q0165.xlsm JVET-Q0125_vs_CE5Anchor.xlsm JVET-Q0125_vs_CE5Anchor_CorrectedYUV.xlsm source_JC_WeightMap.zip ~$JVET-Q0125_vs_CE5Anchor.xlsm
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No action was taken on this.
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