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Optical Engineering

Two-source decomposition and discrete-cosine-transform--Hadamard-transform coding of low-correlation interframe differences
Author(s): Yoo-Sok Saw; Rae-Hong Park; Peter M. Grant; John M. Hannah
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Paper Abstract

International standards such as ITU-T H.263 (H.261) and ISO MPEG use a hybrid coding scheme based on the discrete cosine transform (DCT). Although the DCT is an established technique for encoding interframe differences, it is not an optimal transform for low-correlation interframe differences, since its energy compaction performance largely depends on the correlation of the data. In this paper an effective technique for encoding interframe difference is proposed and verified on an MPEG2 software encoder. The technique decomposes the interframe difference into two sources in order to exploit their improved statistical properties. The two-source interframe difference is encoded with a combined transform, which consists of the DCT and the Hadamard transform (HT). Two-source decomposition increases the correlation of the decomposed prediction error, and the DCT-HT scheme is shown to efficiently encode the decomposed interframe difference with increased performance. Analytic and experimental comparison shows that the proposed DCT-HT scheme gives significant objective and subjective gains over the conventional DCT-based video encoding method.

Paper Details

Date Published: 1 July 2001
PDF: 9 pages
Opt. Eng. 40(7) doi: 10.1117/1.1385329
Published in: Optical Engineering Volume 40, Issue 7
Show Author Affiliations
Yoo-Sok Saw, LG Electronics Inc. (South Korea)
Rae-Hong Park, Sogang Univ. (South Korea)
Peter M. Grant, Univ. of Edinburgh (United Kingdom)
John M. Hannah, Univ. of Edinburgh (United Kingdom)


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