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Telecommunications and Radio Engineering
SJR: 0.202 SNIP: 0.2 CiteScore™: 0.23

ISSN Печать: 0040-2508
ISSN Онлайн: 1943-6009

Выпуски:
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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v74.i12.20
pages 1051-1070

ANALYSIS OF DCT SPECTRUM STATISTICS FOR IMAGE PROCESSING APPLICATIONS

V. V. Lukin
National Aerospace University (Kharkiv Aviation Institute), 17 Chkalov St., Kharkiv, 61070, Ukraine
S. K. Abramov
Department of Transmitters, Receivers and Signal Processing, National Aerospace University (Kharkiv Aviation Institute), 17 Chkalov St., Kharkiv, 61070, Ukraine
A. A. Roenko
National Aerospace University (Kharkiv Aviation Institute), 17, Chkalova Str., Kharkiv, 61070, Ukraine
J. T. Astola
Tampere University of Technology, Signal Processing Laboratory, P. O. Box 553, FIN-33101, Tampere, Finland
Karen O. Egiazarian
Tampere University, Tampere, 33720, Finland

Краткое описание

Statistical characteristics of coefficients of discrete cosine transform (DCT) in 8×8 pixel blocks of grayscale images are analyzed. Robust estimators of distribution scale and tail heaviness are used in analysis since it is shown that the considered distributions are essentially non- Gaussian and they are better described by generalized Gaussian distribution (GGD) with variable parameters. Parameters of these distributions are determined for noise-free images and the same images corrupted by additive white Gaussian noise. It is demonstrated that the noise presence considerably changes distribution that approaches to Gaussian for high frequency DCT coefficients. Parameters of GGD model depend on both image properties and noise variance. The usefulness of the obtained results for two operations of image processing (variance estimation and filtering) is shown.