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-J0333 Cross-verification of simplification of multiple sign bit hiding criterion (JCTVC-J0094) [Y. Yu, W. Wan (Broadcom Corp)] [late]
JCTVC-J0447 Crosscheck of simplification of multiple sign bit hiding criterion (JCTVC-J0094) [G. Clare, F. Henry (Orange Labs)] [late]
JCTVC-J0099 Sign data hiding simplification [J. Sole, M. Karczewicz (Qualcomm)]

Two methods that allegedly simplify the sign data hiding algorithm are proposed. A first method removes the first non-zero position dependency from the sign hiding criterion. There is no average BD-rate difference on common conditions and −0.1% for RDOQ off case. A second method applies the hiding criterion only once per transform unit (instead of once every 16 coefficients) and doesn’t need to keep track of the position of the first and last non-zero coefficients in the coefficient group. The average BD-rate for all configurations is −0.1% for common conditions and −0.2% for RDOQ off case. Further encoder-only changes related to RDOQ result in average BD-rates in common test conditions of −0.1% for Main profile and −0.3%, −0.4%, −0.6% for AI, RA, and LB-HE, respectively.

Questions raised:

• 
  This method could be applied to single coefficients – would this have visual impact?
  
• 
  Might there be interference with other elements e.g. transform skip?
  

No consensus to take action.