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Proceedings Paper

Some fundamental experiments in subband coding of images
Author(s): Sven Ole Aase; Tor A. Ramstad
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Paper Abstract

The paper describes some basic experiments for analyzing the origin and character of the noise in subband coders. A new tool introduced in this paper is an ideal filterbank which guarantees that no interband noise contamination will occur. The coding results are compared with a subband coder based on a standard FIR filterbank. It is found that interband contamination does not play any significant role in the subjectively perceived noise in an image subband coder. Further experiments show that the noise in the decoded image, which subjectively manifests itself as ringing noise in smooth areas close to higher activity regions, is due to the thresholding to zero of a large number of small amplitude subband samples, which takes place in the quantization procedure. It can be thoroughly removed by the dithering technique. The article presents some image material demonstrating the cited results.

Paper Details

Date Published: 1 November 1991
PDF: 11 pages
Proc. SPIE 1605, Visual Communications and Image Processing '91: Visual Communication, (1 November 1991); doi: 10.1117/12.50220
Show Author Affiliations
Sven Ole Aase, Norwegian Institute of Technology (Norway)
Tor A. Ramstad, Norwegian Institute of Technology (Norway)

Published in SPIE Proceedings Vol. 1605:
Visual Communications and Image Processing '91: Visual Communication
Kou-Hu Tzou; Toshio Koga, Editor(s)

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