UNSPECIFIED (1997) The design of 2-D approximately linear phase filters using a direct approach. SIGNAL PROCESSING, 57 (3). pp. 205-221. ISSN 0165-1684

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Abstract

A novel approach to the design of approximately linear phase recursive digital filters was recently described. The technique exploited a property of allpass transfer functions which allowed the creation of a set of linear simultaneous equations in the filter coefficients which could then be solved in the least-squares sense. This paper extends the design method to 2-D and multi-D filters. These filters find application in many areas including image processing, image coding, filter banks and seismic data processing. Several problems arise which are not present in the 1-D design and the paper looks at ways to overcome them. In addition, there is discussion on the stability issue. Several examples including circularly, elliptically and diamond symmetric lowpass filters and a fan filter are presented. Comparison is made between the proposed technique and those of Gu and Swamy (1994) and Toyoshima et al. (1990). (C) 1997 Elsevier Science B.V.

Item Type:	Journal Article
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Journal or Publication Title:	SIGNAL PROCESSING
Publisher:	ELSEVIER SCIENCE BV
ISSN:	0165-1684
Date:	March 1997
Volume:	57
Number:	3
Number of Pages:	17
Page Range:	pp. 205-221
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/17718

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