International organisation for standardisation

5.2CE2: Motion partitioning and OBMC

5.2.1Summary

5.2.1.1.1.1.1.1.1JCTVC-F022 CE2: Summary report of Core Experiment on motion partitioning and OBMC [X. Zheng, P. Bordes, P. Chen, I.-K. Kim (CE Coordinators)]

This document summarizes the activities of CE2 related to Motion Partitioning and OBMC. The description of the experiment can be found in JCTVC-D702. In this CE, five tools have been studied and evaluated: Asymmetric Motion Partitioning (AMP), Non-rectangular Motion Partitioning (NRMP), Overlapped Block Motion Compensation (OBMC), Non-Square Quadtree Transform (NSQT) and OBMC with Motion Merging. 14 companies have been involved as proponent or cross-checker.

Some subtests involve feature combinations, where it may be desirable to identify which aspect is the source of the reported gain.

The schemes that add more segmentation shapes come with increased encoder requirements to evaluate those additional shapes. It was asserted that an encoder that does not test all of these would not be degraded in quality relative to not having them in the design.

Regarding OBMC, JCTVC-F299-v2 has draft text – actually pseudocode, and not connected to the rest of the draft.

It was remarked that the OBMC requires generation of larger motion partitions. The complexity increase related to this seems substantially dependent on implementation architecture.