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Proceedings Paper

Reduction of coding artifacts in subband coders using adaptive filter banks
Author(s): Max Bever; John Hakon Husoy; Sven Ole Aase; Tor A. Ramstad
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Paper Abstract

This paper deals with still image subband coding with adaptive filter banks. Based on an analysis of distortions in coders with fixed filter banks with different characteristics, the scheme with spatially adaptive filter banks is developed. The main objective is to construct a subband coder in which both ringing noise and blocking artifacts are reduced. With respect to local image characteristics, suitable filter responses are selected to achieve this aim. The selection is based on measuring of edge business and edge orientation. A second objective is to reduce border distortions caused by the circular extension method by employing filters with short unit pulse responses in the border regions. It turns out that subband coding with adaptive filter banks in combination with an optimum filter selection strategy achieves a good trade-off between ringing noise and blocking effects. We conclude that the presented scheme for automatic filter selection works well for a large class of images with reasonably high contrast. For 'smooth-looking' images further work to improve the robustness of the algorithm is needed. The use of adaptive filtering in the image border regions solves--to some extent--the distortion problems encountered when using the circular extension method.

Paper Details

Date Published: 20 October 1993
PDF: 13 pages
Proc. SPIE 2028, Applications of Digital Image Processing XVI, (20 October 1993); doi: 10.1117/12.158629
Show Author Affiliations
Max Bever, Technical Univ. of Aachen (Germany)
John Hakon Husoy, Rogaland Univ. Ctr. (Norway)
Sven Ole Aase, Norwegian Institute of Technology (Norway)
Tor A. Ramstad, Norwegian Institute of Technology (Norway)


Published in SPIE Proceedings Vol. 2028:
Applications of Digital Image Processing XVI
Andrew G. Tescher, Editor(s)

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