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17th Meeting: Brussels, January 2020 2020-01-15 15:04
CE2/CE3-related : Lossless coding for palette coding
Authors: S. Yoo LGE J. Choi LGE J. Lim LGE S. Kim LGE Sunmi Yoo
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-Q0801 CE2/CE3-related: Lossless coding for palette coding [S. Yoo, J. Choi, J. Lim, S. Kim (LGE)] [late]

Presented in Track B Wednesday 15 January, 1630

In the current VVC draft text, Exponential-Golomb with 3rd order (EG3) is utilized for the escape value coding. However, the distribution of the maximum escape value varies significantly over QP values so that it could produce the number of bits more than an input bitdepth of a sequence. Moreover, at Brusssels meeting, EG5 is adopted for escape value binarization method. Therefore, a binarization selection method between the fixed length coding (FLC) and EG5 is proposed, by sending a high level flag to indicate which binarization to be used. For FLC binarization, the input bit depth (cMax for bin length) is not transmitted but derived using the syntax element, min_qp_prime_ts_minus4. The coding efficiency reportedly shows like below:

  • Lossless
    • TGM 1080p
      • Dual Tree = 1 : -3.11% (AI) / -2.85% (RA)
      • Dual Tree = 0 : -4.94% (AI) / -3.54% (RA)
    • Overall
      • Dual Tree = 1 : -1.49% (AI) / -0.99% (RA)
      • Dual Tree = 0 : -1.95% (AI) / -1.10% (RA)
  • Low QP (2 ,7, 12, 17)
    • TGM 1080p
      • Dual Tree = 1 : -0.99% (AI) / -0.93% (RA)
      • Dual Tree = 0 : -2.14% (AI) / -1.65% (RA)
    • Overall
      • Dual Tree = 1 : -0.55% (AI) / -0.51% (RA)
      • Dual Tree = 0 : -0.97% (AI) / -0.70% (RA)

For QP 2..12 and lossless, fixed length coding is used, otherwise EG5.

No support was expressed by other experts

No action was taken on this.

References:
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JVET-Q0812 X
ARCHIVE v2 :
JVET-Q0801_DualTree0_lossless_444.xlsm JVET-Q0801_DualTree1_lossless_444.xlsm JVET-Q0801_EG3_DualTreeOFF_lowQP_v2.xlsm JVET-Q0801_EG3_DualTreeON_lowQP_v2.xlsm JVET-Q0801_EG5_DualTreeOFF_lowQP.xlsm JVET-Q0801_EG5_DualTreeON_lowQP.xlsm JVET-Q0801_v1.pdf JVET-Q0801_v2.docx JVET-Q0801_WD_v2.docx
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