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 second meeting during 21-28 July, 2010 at the itu-t premises in Geneva, ch

JCTVC-B049 [P. Chen, W. Chien, R. Panchal, M. Karczewicz (Qualcomm)] Geometry motion partition

Results of geometry motion partitioning were presented in this contribution. The average bit rate reduction was reported as 4.3% for IPPP configuration and 3.9% for hierarchical-B configuration.

The reported encoder complexity was reported as approximately doubled.

The decoder also has some increased complexity (extra memory bandwidth).

JCTVC-B052 [A. Krutz, A. Glantz, T. Sikora (Tech. Univ. Berlin)] TE3: Adaptive global motion temporal prediction

This document presents the results for Subtest 1 of Tool Experiment 3 (Inter Prediction in HEVC). The tool presented herein is a prediction mode, i.e. Adaptive Global Motion Temporal Prediction (GMTP), for hybrid video coding environments that is based on global motion compensation and optionally on temporal filtering of spatially aligned pictures. Once a GMTP picture is available, the encoder chooses the macroblock types by means of rate-distortion optimization (RDO). If it chooses to encode a block using GMTP, only the type identifier is sent inside the macroblock header. No further information, e.g. coded block pattern, quantization parameters or coefficients are included in the bitstream for that block. This is a new GMTPSKIP mode.

The method has been evaluated using a set of 33 test sequences, including classes A to D of the CfP. The evaluation follows the experimental conditions of the TE3 experiment JCTVC-A303. The new prediction mode was incorporated into the JM 17.0 reference software.

Compared to gamma anchor. Used one warped reference frame.

Average 1% gain for class A. For class B, average 1% at high bit rate and 6% at low bit rate. For class C, average 2.2 at high rate and 2.8% at low bit rate. For class D, 1.9% at high bit rate and degradation at low bit rate. Sequences included those used for the subjective CfP test and also any others that were in the corresponding class in the MPEG CfP sequence candidate repository.

Some significant complexity impact was noted.