Opened 3 years ago

Closed 2 years ago

#1520 closed defect (fixed)

Subclause 8.6.1 - IBC SINGLE_TREE case processing chroma in monochrome

Reported by: crosewarne Owned by:
Priority: minor Milestone:
Component: spec Version:
Keywords: Cc: ksuehring, bbross, XiangLi, fbossen, jvet@…


In subclause '8.6.1 General decoding process for coding units coded in IBC prediction mode':

Steps 1-4 include sub-steps conditioned as 'When treeType is equal to SINGLE_TREE..' followed by chroma-related operations. These are block vector derivation, prediction samples generation, residual samples decoding, and reconstructed samples generation, for steps 1-4, respectively.

These steps seem to be performed regardless that sps_chroma_format_idc could be equal to 0. I think they should be also conditioned on sps_chroma_format_idc is not equal to 0.

This was seen in the 2020/08 release of H.266, and in the version present in the JVET-X1004 errata report.

The above suggestion would align VVC to VTM.

Change history (1)

comment:1 Changed 2 years ago by yk

  • Resolution set to fixed
  • Status changed from new to closed

Thanks! This will be fixed in the VVC attachment of JVET-Y1004, and the ITU-T VVC v2 text, and the ISO/IEC VVC v2 FDIS text.

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