Article View: sci.image.processing
Article #461Re: 2d dft phase info
From: S.P.Zeidler
Date: Tue, 08 Sep 1992 23:24
Date: Tue, 08 Sep 1992 23:24
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In <1992Sep7.110102.25536@bnr.co.uk> pgh@bnr.co.uk (Peter Hamer) writes:
>Serious question: so why not use the Hartley transform which does not
>introduce these redundancies in the first place?
>... or use your favourite Fourier package and display the Hartley transform?
My favourite Fourier transform package is a Radix-8 FFT that does
512x512 float -> 256x512 complex in 4.3 sec on a DECStation 5000/200,
and was written by myself (that's why it is my favourite ;-), and
doesn't contain a Hartley transform.
Seriously, though: I need phase and modulus seperately, and it wouldn't
make sense to first compute 10,000 Hartley transforms followed by the
same number of phase/modulus separations, because that would take even
longer than shoving the stuff thru the optimized FFT.
regards,
spz
--
spz is S.Petra Zeidler Copyright 1992 S.Petra Zeidler
spz@specklec.mpifr-bonn.mpg.de
MPI fuer Radioastronomie Bonn
Auf dem Huegel 69, Germany reading prescription: cum kilo salis
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Newsgroups: sci.image.processing Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!Germany.EU.net!mpifr-bonn.mpg.de!specklec.mpifr-bonn.mpg.de!spz From: spz@specklec.mpifr-bonn.mpg.de (S.P.Zeidler) Subject: Re: 2d dft phase info Message-ID: <1992Sep8.232448.14932@mpifr-bonn.mpg.de> Sender: news@mpifr-bonn.mpg.de Nntp-Posting-Host: specklec Organization: Max-Planck-Institut f"ur Radioastronomie References: <9209011949.AA19843@hp-and.an.hp.com> <1992Sep2.194306.2275@mpifr-bonn.mpg.de> <1992Sep7.110102.25536@bnr.co.uk> Date: Tue, 8 Sep 1992 23:24:48 GMT Lines: 23