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31st Meeting: Geneva, CH, July 2023 2023-07-13 08:11
Non-EE2: Local illumination compensation with multiple templates
Authors: Yifan Wang ByteDance Kai Zhang ByteDance Yong He ByteDance H. Liu ByteDance Li Zhang ByteDance Yang Wang
Abstract
This contribution presents a method of local illumination compensation with multiple templates. Apart from using a template comprising neighbouring samples both top to and left to the current block, two new LIC modes using top-only or left-only template are proposed to derive the parameters of LIC. On top of ECM-9.0, simulation results of the proposed method are reported as below:
Meeting Notes
JVET-AE0105 Non-EE2: Local illumination compensation with multiple templates [Y. Wang, K. Zhang, Y. He, H. Liu, L. Zhang (Bytedance)]

This contribution presents a method of local illumination compensation with multiple templates. Apart from using a template comprising neighbouring samples both top to and left to the current block, two new LIC modes using top-only or left-only template are proposed to derive the parameters of LIC. On top of ECM-9.0, simulation results of the proposed method are reported (estimated) as below:

  • RA: {-0.09%%, -0.20%, -0.16%; 109.4%, 100.1%};
  • LDB*: {-0.06%, -0.15%, -0.32%; 117.6%, 99.6%}.

Different shapes could be used for different motion vectors in same location.

Is there dependency of templates between adjacent blocks? Not currently exploited.

Possibility to reduce encoding time? No concrete ideas or preliminary experimentation were available for this yet.

This is also applied to chroma.

Several experts expressed this is an interesting approach. Further study was recommended on largely reducing encoding time while keeping the benefit in compression.

Cited:
JVET-AE0224 X
ARCHIVE :
JVET-AE0105.docx JVET-AE0105.pdf JVET-AE0105.xlsm JVET-AE0105_r1.docx JVET-AE0105_r2.docx
Decisions
Several experts expressed this is an interesting approach. Further study was recommended on largely reducing encoding time while keeping the benefit in compression.
Citation