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Proceedings Paper

Subband decomposition procedure for quincunx sampling grids
Author(s): Chai Wook Kim; Rashid Ansari
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Paper Abstract

Filters with diamond shaped passbands and stopbands are used in image and video processing for several different tasks, one of which is the subband decomposition of signals. This subband decomposition can be carried out in a tree-structured manner by using diamond prefilters followed by downsampling on quincunx grids at each stage. In order to use such a decomposition in hierarchical coding it is desirable to choose the lowpass filter to be a halfband filter so as to limit the amount of aliasing in the low frequency component of the signal at each stage. This paper addresses the design and implementation of a two-channel filter bank for such an application. A special class of one-dimensional (1-D) prototype filters is used to derive the filter banks. The procedure is based on obtaining a halfband filter using a pair of lower order halfband filters. The resulting solutions preserve the exact reconstruction property even when the filter coefficients are quantized, a property which is useful in implementation. Examples of such filter banks are presented.

Paper Details

Date Published: 1 November 1991
PDF: 12 pages
Proc. SPIE 1605, Visual Communications and Image Processing '91: Visual Communication, (1 November 1991); doi: 10.1117/12.50252
Show Author Affiliations
Chai Wook Kim, Univ. of Pennsylvania (United States)
Rashid Ansari, Bell Communications Research (United States)

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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