Opened 12 months ago

Closed 11 months ago

Last modified 11 months ago

#1602 closed defect (fixed)

Need clearification for 8.4.3 Derivation process for chroma intra prediction mode

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

Description

For 12b444vvc1_A_Sony_2.bit, the second decode frame(poc 32), and cu position (64,68)
The treeType is equal to SINGLE_TREE, sps_chroma_format_idc is equal to 3, intra_chroma_pred_mode is equal to 0,and IntraMipFlag[ xCb ][ yCb ] is equal to 1

based on

  1. If IntraMipFlag[ xCb + cbWidth / 2 ][ yCb + cbHeight / 2 ] is equal to 1, lumaIntraPredMode is set equal toINTRA_PLANAR.
  2. Table 20

we need set IntraPredModeC to 66, which conflicts with vtm code https://vcgit.hhi.fraunhofer.de/jvet/VVCSoftware_VTM/-/blob/master/source/Lib/CommonLib/UnitTools.cpp#L734

could you explain why?

thank you.

Attachments (1)

spec-fix_1602.docx (23.0 KB) - added by bbross 12 months ago.

Download all attachments as: .zip

Change history (4)

Changed 12 months ago by bbross

comment:1 Changed 12 months ago by bbross

Thanks for reporting and this is related to #1558 fixing another bug in the mode derivation for 444.
Indeed, the VTM behaviour for 444 is correct and the attached fix based on the JVET-AD2005 text fixes the issue.

comment:2 Changed 11 months ago by bbross

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

To be fixed as suggested in both the ITU-T and ISO texts for VVC v3.

comment:3 Changed 11 months ago by nuomi

thank you bbross

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