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 tenth meeting during 11-20 July 2012 at the City Conference Centre (ccc), a k. a

JCTVC-J0370 Cross-verification of JCTVC-J0138 on NSQT simplification [M. Zhou (TI)] [late]
JCTVC-J0415 Cross-verification of JCTVC-J0138 NSQT simplification [L. Guo (Qualcomm)] [late]
JCTVC-J0514 Cross-check of JCTVC-J0138 on NSQT simplification [X. Fang, K. Panusopone, L. Wang (Motorola Mobility)] [late]
JCTVC-J0364 Implicit transform block split process for asymmetric partitions [X. Zheng (HiSilicon)]

This contribution provides an implicit TU split solution for asymmetric partitions when “QuadtreeTUMaxDepthInter” is set to 1. Experimental results show that the proposed solutions can contribute average coding gain from 0.3% to 1.3% at Main profile configurations. Both encoder and decoder complexity are same as HM7.0.

Two solutions are suggested:

• 
  non-square transforms with explicit signaling only for asymmetric partitions (gain compared to RA main is about 0.6%, versus LDB main about 1.2%)
  
• 
  additional implicit square transform split for asymmetric partition
  

Solution 1 appears more complex than the simplified NSQT of J0138

Solution 2 could be practical without too much implementation burden, but results are not available and it is unclear how many changes would be necessary to the text.

Results on solution 2: 0.1% for RA, 0.2% for LDB on average (classes A–E), class F about 0.2% RA, 0.4% LDB.

These results were achieved not against common test conditions, but conditions were modified using RQT depth = 0 for inter.

The additional gain is small and does not justify inclusion, as it requires additional conditions in the draft text and also additional conditions to be checked by the decoder.

JCTVC-J0473 Cross-check of J0364 on Implicit transform block split process for asymmetric partitions [E.François (Canon)] [late]