Opened 10 years ago

Closed 9 years ago

#82 closed defect (fixed)

Obsolete motion data compression in DV derivation process

Reported by: Tomohiro Ikai Owned by: tech
Priority: minor Component: 3D-HEVC text
Version: 3D-HEVC Draft Text 5 Keywords:
Cc: tech, jct-3v@…


Obsolete motion data compression remains in text (I.8.5.5 Derivation process for disparity vectors)


  1. When yCb − 1 is less than ( ( yCb >> Log2CtbSizeY ) << Log2CtbSizeY ), the following applies:

xB1 = ( ( xB1 >> 3 ) << 3 ) + ( ( xB1 >> 3 ) & 1) * 7 (I 251)

In HTM, the compression have been effectively removed when HTM was updated based on the latest(at that point) HM. Specifically, HTM70 has the following in getPUAbove(),


uiAPartUnitIdx = g_motionRefer[uiAPartUnitIdx];


But HTM80 or later doesn't have that process (so removed).

Attachments (1)

3D-HEVC_ticket82.docx (22.3 KB) - added by Tomohiro Ikai 10 years ago.

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Change history (4)

comment:1 Changed 10 years ago by DefaultCC Plugin

  • Cc tech jct-3v@… added

Changed 10 years ago by Tomohiro Ikai

comment:2 Changed 9 years ago by tech

I share the opinion that this text is obsolete and just an inherited residual from an outdated draft HEVC version, which has erroneously not been removed. If there are different opinions, please let me know. Otherwise, I will delete it.

comment:3 Changed 9 years ago by tech

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