Opened 5 years ago

Last modified 5 years ago

#1067 new defect

mismatch between HEVC text and HM reference software

Reported by: sier Owned by:
Priority: minor Milestone: HM-10.1
Component: Text Version: D10 (L1003) v33
Keywords: Cc: bbross, wjhan, jct-vc@…


Low-delay checking process is required for TMVP derivation. The process is carried out by comparing the POC values of current picture and its reference pictures.

In HEVC text, the low-delay checking process is specified in the section of TMVP derivation (i.e. Derivation process for collocated motion vectors), which means the low-delay checking process is done at block-level.

However the low-delay checking process is performed at slice-level in HM reference software, where a low-delay flag is firstly determined at slice-level and then used in TMVP derivation.

It seems the low-delay checking at block-level specified in HEVC text is not reasonable for practical design, since the low-delay checking process is only based on POC values, instead of any block-level information, and meanwhile the block-level low-delay checking increase complexity. Hence alignment with HM reference software is suggested for consideration.

Change History (1)

comment:1 Changed 5 years ago by DefaultCC Plugin

  • Cc bbross wjhan jct-vc@… added
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  • Benjamin Bross(Subscriber)
  • David Flynn(Always)
  • jct-vc@…(Subscriber)
  • Karl Sharman(Always)
  • Karsten Suehring(Always)
  • sier(Reporter)
  • Woo-Jin Han(Subscriber)