2-D FIR design question

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Article #1658

#1658

From: Great Rumpuscat
Date: Tue, 09 Apr 1991 00:27

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	I am working on a problem in image halftoning which requires
a 2-D FIR filter which has a near circular-symmetric frequency response.
That is, its 2-D DTFT should depend only on the radial frequency.  I am
fairly convinced that this cannot be done with a finite impulse 
response.  Does anyone know of any references concerning how close 
(by some measure) one can get?         

Thanks,
ken.
,,,,,,,,,,,,,,,,,crounse@norton.berkeley.edu,,,,,,,,,,,,,,,,,,,,,,,
Kenneth R. Crounse,      -  UC Berkeley
King of                  -  (Rally Behind the Ridiculous)
Randomness and           -  Dept. of EECS
Chaos                    -  Nonlinear Electronics Laboratory

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From: crounse@norton.uucp (Great Rumpuscat)
Newsgroups: comp.dsp
Subject: 2-D FIR design question
Summary: would like near circular symmetry in frequency domain.
Message-ID: <41644@ucbvax.BERKELEY.EDU>
Date: 9 Apr 91 00:27:06 GMT
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