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Journal of Electronic Imaging

Edge-based motion estimation and region based contour tracing for very low bit rate video coding
Author(s): Her-Hsing Chang; Long-Wen Chang
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Paper Abstract

A new algorithm for image sequence coding with a very low bit rate and high picture quality is proposed. The proposed coding system is composed of interframe and intraframe coding. In the interframe coding, an edge-based motion estimation algorithm is used to find the motion vector of a moving block instead of using the conventional block-matching algorithm. The edge-based method reduces the entropy of the estimated motion vectors within a frame. Since the motion vectors are usually encoded by entropy coding, bit rate is also reduced. In the intraframe coding, a region-based algorithm is used to trace the contour of an object and estimate its parameters from a predetermined database of various geometric shapes. It can reduce the blocking effect. By testing several image sequences such as "Miss America" and "Claire" with 10 frames/s in quarter common intermediate format (QCIF) the proposed coding system has about 1 to 2 dBs higher peak SNRs than the H.263 system.

Paper Details

Date Published: 1 January 1998
PDF: 9 pages
J. Electron. Imag. 7(1) doi: 10.1117/1.482634
Published in: Journal of Electronic Imaging Volume 7, Issue 1
Show Author Affiliations
Her-Hsing Chang, National Tsing Hua Univ. (Taiwan)
Long-Wen Chang, National Tsing Hua Univ. (Taiwan)

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