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-J0214 AHG7: Cross-check report of disallow bi-predictive mode for 8x4 and 4x8 inter PUs (JCTVC-J0086) [T. Sugio (Panasonic)]
JCTVC-J0218 Bi-pred merge restriction for small PUs [T. Lee, J. Park (Samsung)]

In the previous meeting, bi-pred restriction for small PUs is adopted where bi-predictive motion information for 8x4 and 4x8 is converted to uni-predictive List0 motion after motion information construction. Assuming that encoder restricts motion search on bi-prediction for such small PUs, the only place where bi-predictive motion is given is the merge mode. In this proposal, bi-predictive merge candidates are restricted during merge candidate derivation process. By removing or converting bi-predictive merge candidates, merge candidate derivation process is reduced in complexity and converting bi-predictive motion on motion compensation process is unnecessary assuming that encoder restricts motion search on bi-prediction for small PUs.“Proposal 1” is suggested solution of proponent.

Something similar was discussed in the last meeting in the context of memory BW reduction, but by that time proposals that suggested change of the merge process for small PUs were not adopted to keep the design common over all PU sizes; it does not have a significant impact on complexity anyway.

No action.