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Proceedings Paper

Optimum dithering for scalar quantization of image subband
Author(s): Mohsen Ashourian; Zulkalnain Mohd. Yusof
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Paper Abstract

A joint optimization method for design of filter banks and related dithered quantizers by using time-domain formulation of filter banks is provided. Mathematical analysis and experiments show that in image subband coding by appreciate choice of synthesis filter bank and dithering, it would be possible to replace signal-dependent artifacts with signal- independent white noise. This process improves the perceptual quality of reconstructed image, especially at low bit-rates and makes it more practical for a noise-removal algorithm to remove the output noise. Experiment results illustrate the effectiveness of dithering for lower frequency bands and modification of synthesis filter bank for higher frequency bands.

Paper Details

Date Published: 30 May 2000
PDF: 10 pages
Proc. SPIE 4067, Visual Communications and Image Processing 2000, (30 May 2000); doi: 10.1117/12.386546
Show Author Affiliations
Mohsen Ashourian, Univ. Technology Malaysia (Malaysia)
Zulkalnain Mohd. Yusof, Univ. Technology Malaysia (Malaysia)


Published in SPIE Proceedings Vol. 4067:
Visual Communications and Image Processing 2000
King N. Ngan; Thomas Sikora; Ming-Ting Sun, Editor(s)

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