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Title: Analysis of dyadic approximation error for hybrid video codecs with integer transforms
Authors: Wong, CW
Siu, WC 
Keywords: Discrete cosine transform (DCT)
Dyadic approximation
Error analysis
Integer transform
Video coding
Issue Date: 2011
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on image processing, 2011, v. 20, no. 10, 5740603, p. 2780-2787 How to cite?
Journal: IEEE transactions on image processing 
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.
ISSN: 1057-7149
EISSN: 1941-0042
DOI: 10.1109/TIP.2011.2134105
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