The Joint Collaborative Team on Video Coding (jct-vc) of itu-t wp3/16 and iso/iec jtc 1/sc 29/wg 11 held its second meeting during 21-28 July, 2010 at the itu-t premises in Geneva, ch

JCTVC-B060 [S. Park, B.-M. Jeon (LG)] TE3: cross-check result of JCTVC-B052 adaptive global motion temporal prediction

Withdrawn

JCTVC-B074 [M. Karczewicz, H.-C. Chuang, P. Chen, R. Joshi, W.-J. Chien (Qualcomm)] Rounding controls for bidirectional averaging

Two modifications for increasing the precision of bi-directional prediction and transform, when IBDI mode is not used, are proposed. The average BD rate reduction is 2.6% for IPPP configuration and 1.4% for hierarchical-B configuration. The results are obtained using TMuC 0.2.

Two aspects were proposed:

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  Send rounding control - similar to prior KTA proposals VCEG-AI20 and VCEG-AI33.
  
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  Increase the bit depth of transform processing.
  

With these modifications, the IBDI benefit shrinks to roughly 2.5% (which would be further reduced if the reference picture storage bit depth is decreased to 8 bits).

A suggestion made by a participant was to shift down some of the inverse transform precision between the horizontal and vertical stages, to prevent excess complexity through the transform processing stages.