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Proceedings Paper

Variable block size video coding with motion prediction and motion segmentation
Author(s): Kui Zhang; Miroslaw Bober; Josef Kittler
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Paper Abstract

In the paper we are concerned with the efficient coding of image sequences for video- conference applications. In such sequences, large image regions usually undergo a uniform translational motion. Consequently, to maximize the coding efficiency and quality, the codec should be able to segment and estimate multiple translational motions accurately and reliably. Following the above premise, we propose an algorithm which combines several known and new techniques. Firstly, a traditional variable block size motion compensation was used, but employing a novel robust motion estimation algorithm. The algorithm can estimate multiple motions to a sub-pixel accuracy and also provides a reliable motion segmentation. Whenever there exist multiple motions within a block, the motion boundary is recovered and approximated by a straight line. Also, an inter-block motion prediction is used to achieve a further improvement of the compression ratio. A comparison with the H.261 scheme shows that the proposed algorithm produces better results both in terms of PSNR and bit-rate. To judge the contribution of the motion segmentation to the overall performance, experiments have been carried out with a variant of the algorithm where only single motion within any block is allowed. This incapacitated variant emulates a commonly used approach for variable block size coding. The comparison of the proposed and incapacitated variants shows that the use of motion segmentation can lower the bit rate and deliver a better visual quality of the reconstructed image sequence.

Paper Details

Date Published: 17 April 1995
PDF: 9 pages
Proc. SPIE 2419, Digital Video Compression: Algorithms and Technologies 1995, (17 April 1995); doi: 10.1117/12.206394
Show Author Affiliations
Kui Zhang, Univ. of Surrey (United Kingdom)
Miroslaw Bober, Univ. of Surrey (United Kingdom)
Josef Kittler, Univ. of Surrey (United Kingdom)

Published in SPIE Proceedings Vol. 2419:
Digital Video Compression: Algorithms and Technologies 1995
Arturo A. Rodriguez; Robert J. Safranek; Edward J. Delp, Editor(s)

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