Overlapped block motion compensation: an estimation-theoretic approach
- 1 January 1994
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Image Processing
- Vol. 3 (5), 693-699
- https://doi.org/10.1109/83.334974
Abstract
We present an estimation-theoretic analysis of motion compensation that, when used with fields of block-based motion vectors, leads to the development of overlapped block algorithms with improved compensation accuracy. Overlapped block motion compensation (OBMC) is formulated as a probabilistic linear estimator of pixel intensities given the limited block motion information available to the decoder. Although overlapped techniques have been observed to reduce blocking artifacts in video coding, this analysis establishes for the first time how (and why) OBMC can offer substantial reductions in prediction error as well, even with no change in the encoder's search and no extra side information. Performance can be further enhanced with the use of state variable conditioning in the compensation process. We describe the design of optimized windows for OBMC. We also demonstrate how, with additional encoder complexity, a motion estimation algorithm optimized for OBMC offers further significant gains in compensation accuracy. Overall mean-square prediction improvements in the range of 16 to 40% (0.8 to 2.2 dB) are demonstrated.Keywords
This publication has 9 references indexed in Scilit:
- An overlapped block motion compensation for high quality motion picture codingPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Motion-compensating prediction with fractional-pel accuracyIEEE Transactions on Communications, 1993
- Predictive motion-field segmentation for image sequence codingIEEE Transactions on Circuits and Systems for Video Technology, 1993
- Multi-hypothesis motion compensation for low bit-rate video codingPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1993
- Frequency-domain motion estimation using a complex lapped transformIEEE Transactions on Image Processing, 1993
- Overlapped block motion compensationPublished by SPIE-Intl Soc Optical Eng ,1992
- Motion compensation for video compression using control grid interpolationPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1991
- The Efficiency of Motion-Compensating Prediction for Hybrid Coding of Video SequencesIEEE Journal on Selected Areas in Communications, 1987
- Advances in picture codingProceedings of the IEEE, 1985