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-J0159 Cross check of MediaTek’s proposal JCTVC-J0052 [J. Kim (LGE)]
JCTVC-J0160 Parameter derivation for intra LM chroma prediction [J. Kim, B. Jeon (LGE)]

This contribution proposes a method to employ the samples around CUs (i.e. Coding blocks) instead of TUs(i.e. Transform blocks) in order to get parameters for intra LM chroma mode. It aims to reduce the number of calculation of parameters and corresponding calculation burden. It shows 0.0%, −0.7%, −0.2% BD-rate under the AIHE10 condition. It also shows 0.0%, −0.7%, −0.6% and 0.0%, 0.1%, −0.3% BD rate −0.3%, −0.2% BD-rates respectively under the RAHE10 and LBHE10 condition. It alters two words in the Text.

The initial computation becomes more complex (and may be subject to overflow in addition as the area is 2x as large at maximum); also introduces potential latency in first chroma block; on the other hand, the overall complexity is reduced as the process is only invoked once. For CU of size 8x8 (worst case) it does not help.

One expert mentions that the method may even have a slight complexity disadvantage due to the larger extension to CU size.

No action.

JCTVC-J0146 Cross-check report of JCTVC-J0160 on LM parameter estimation [Y. Lin (HiSilicon)]