Opened 10 years ago

Closed 10 years ago

#20 closed defect (fixed)

Mismatch of SHVC draft 5 and SHM-5.0 software in bit-depth scalability with 1x scalability

Reported by: auyeung Owned by: Vadim
Priority: minor Milestone: Draft 5
Component: SHM software Version: Draft 4 version 3
Keywords: Cc: Vadim, jct-vc@…

Description

When bit-depth scalability is enabled with 1x spatial scalability, SHM-5.0 software does not match the specification of the resampling process in section H.8.1.4 of SHVC working draft 5.

SHVC draft 5 section H.8.1.4 specifies that when the base layer and enhancement layer have the same picture sizes, same internal bit-depths, and zero scaled reference layer offsets, the inter-layer reference picture ilRefPic is set equal to the decoded reference layer picture rlPic.

However in SHM-5.0, when the base layer and enhancement layer have the same picture sizes and zero scaled reference layer offset, the inter-layer reference picture ilRefPic is set equal to the decoded reference layer picture rlPic without checking the bit-depth difference of BL and EL. Consequently, SHM-5.0 does not support bit-depth scalability with 1x scalability in the inter-layer prediction process.

This bug was reported in JCTVC-Q0130, and two implementations of the bug fix are in the software attached in JCTVC-P0130-v2 with the following two macros:

  • BIT_DEPTH_AND_1X_SCALABILTY_FIX1
  • BIT_DEPTH_AND_1X_SCALABILTY_FIX2

Change history (2)

comment:1 Changed 10 years ago by DefaultCC Plugin

  • Cc Vadim jct-vc@… added

comment:2 Changed 10 years ago by Vadim

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

fixed with rev 637 and rev 640

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These roles will be notified: Reporter, Owner, Subscriber, Participant

  • Cheung Auyeung(Reporter)
  • Gerhard Tech(Always)
  • jct-vc@…(Subscriber)
  • Karsten Suehring(Always)
  • Vadim Seregin(Owner, Subscriber, Participant)