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Analysis of Dyadic Approximation Error for Hybrid Video Codecs With Integer Transforms.
- Source :
-
IEEE Transactions on Image Processing . Oct2011, Vol. 20 Issue 10, p2780-2787. 8p. - Publication Year :
- 2011
-
Abstract
- In this paper, we present an analysis of the dyadic approximation error introduced by the integerization of transform coding in H.264/AVC-like codecs. We derive the analytical formulations for dyadic approximation error and nonorthogonality error. We further classify the dyadic approximation error into a “system error” and a “nonflat error,” and proposed two models for them. We found that the “nonflat error” has a substantial impact on video quality if the number of shifting bits at decoder side (DQ_BITS) is small. We also give a theoretical justification on why scaling factors at encoder side are better to be adapted to the rescaling factors at decoder side in H.264/AVC-like codecs. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10577149
- Volume :
- 20
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Image Processing
- Publication Type :
- Academic Journal
- Accession number :
- 65935178
- Full Text :
- https://doi.org/10.1109/TIP.2011.2134105