Organisation internationale de normalisation

16.3Discussion and Conclusions

Decision: Adopt MDHIS from JCTVC-D282 (only LUT1 without switching) into HM.

It was remarked that JCTVC-109 uses a similar approach, LUT based filtering for prediction signal – which may be further investigated in CE (which was suggested to be included in an intra prediction CE).

17Non-CE Technical Contributions

17.1Clarification and Bug Fix Issues

17.1.1.1.1.1.1.1.1JCTVC-D027 List of items requiring clarification/action in HM1 [A. Osamoto, M. Zhou, V. Sze (TI)]

This document reported a number of inconsistencies and/or illogical procedures found in TMuC 0.9 software and HM1. These items should be clarified and/or studied.

• 
  CABAC Binarization of refidx: fix provided (JCTVC-D141 element 4, ticket 108 is related).
  
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  Chroma boundary strength calculation for Deblocking filter (JCTVC-D395 is related).
  
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  Order of CABAC sub-block coding within a CU.
  
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  Reference frame management and reference list generation (should mostly carry over from AVC except for aspects decided otherwise, and we should avoid changing the common conditions behavior).
  
• 
  Chroma intra prediction for chroma intra prediction mode of 4 (need to avoid 2x2 chroma, and most NxN splits have been removed – so no longer needed).
  
• 
  Weak deblocking filter operation for p1 and q1 (change division by 2 to shift – needs further study).
  

Decision: The first three items above are agreed (and fixes are already in the software for the first two, although the fixes had previously been disabled). This assumed that an experiment report would be provided showing approximately no coding efficiency impact.

Decision: The fourth item was also agreed in spirit, although this is not the top priority for current software development.

17.1.1.1.1.1.1.1.2JCTVC-D451 Report on bugfix for CABAC sub-block coding reported in JCTVC-D027 [T. Nguyen, K. Suehring] (late registration Wednesday 26th after start of meeting, uploaded Thursday 27th, near the end of the meeting)

This contribution reported a bug fix for CABAC sub-block coding. It was noted that the bug does not affect coding performance. The fix will be included in the next HM software release.

17.1.1.1.1.1.1.1.3JCTVC-D395 Comments on chroma deblocking bug fix 119 and WD1 draft text [A. Norkin, S. Sjöberg (Ericsson)]

A bug fix in chroma deblocking has been found and fixed. The bug fix "BUGFIX119" changes the coder behavior. The fix does not match the HEVC draft text in document JCTVC-C403. Other mismatches between the deblocking description and standard text had also been found. Suggested draft text changes were included in the contribution.

JCTVC-D027 is related to the first aspect. See the notes in the discussion of that contribution.

The first uploaded version did not have the second aspect. The second uploaded version was submitted late (on the 23rd).

It was reported that the text is inferior to the software for the deblocking filter, and draft text was provided.

Decision: The text should be fixed.