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Content Provider | IEEE Xplore Digital Library |
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Author | Kaup, A. |
Copyright Year | 1991 |
Abstract | This paper describes some of the most promising segment-based coding techniques which have been investigated in the course of the MPEG-4 standardization process. Padding methods aim at extending arbitrarily shaped image segments to a regular block grid such that common hybrid block-based coding techniques can be applied. A simple and efficient padding technique employing low-pass extrapolation is outlined which yields a signal extension with high energy concentration in the low-frequency area. Simulations indicate that this method is well suited for block-based video coding, and clearly outperforms other low-complexity extrapolation methods with respect to coding efficiency. In contrast to padding techniques, shape-adaptive methods take advantage of the shape information available at the decoder side. A well-known representative of this class is the SA-DCT. However, having been primarily designed for intraframe coding, it is shown that the transform is suboptimal when applied to interframe coding. Using a suitable covariance model, it is demonstrated that a rescaled, orthonormalized transform much closer approximates the optimal shape-adaptive eigentransform of motion-compensated frame difference images. Rate distortion curves verify that orthonormalization improves coding efficiency in interframe coding by up to 2 dB while not adding to complexity. In a comparison, it is finally shown that extrapolation and SA-DCT perform very closely in the case of low data rates, while there is a clear advantage for the shape-adaptive transform in the case of high-quality video coding. |
Sponsorship | IEEE Circuits and Systems Society |
Starting Page | 5 |
Ending Page | 15 |
Page Count | 11 |
File Size | 312096 |
File Format | |
ISSN | 10518215 |
Volume Number | 9 |
Issue Number | 1 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 1999-02-01 |
Publisher Place | U.S.A. |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | MPEG 4 Standard Video coding Image coding Image segmentation Extrapolation Shape Decoding Layout Standardization Rate-distortion |
Content Type | Text |
Resource Type | Article |
Subject | Electrical and Electronic Engineering Media Technology |
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