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Thu, 10 August 1995 00:00

trond
Messages: 9
Registered: June 1994

Junior Member

Please let me know if you know about any good de-trending IDL algoritms
for use with the IDL FFT algorithm.
The objects under study are a bit truncated by the finite size of the image
and these abrupt gradients tend to pollute the resulting DFT, obscuring the
detail of interest to me.
Any hints are welcome.
Sincerely,
Trond
--
Trond Steinar Trondsen VE6NOR/LA1OEA
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/ _/_/_/_/_/_/_/_/_/_/
opinions packed by volume University of Calgary/Physics
trond@phys.ucalgary.ca not by weight, etc. Institute for Space Research

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Re: 2D DFT Detrending Algorithms [?] [message #4901 is a reply to message #4802]

Thu, 10 August 1995 00:00

lgao
Messages: 4
Registered: August 1995

Junior Member

Use polywarp to fit the low freq trend and then subtract it. Or you might
use adaptive LUT (region by region) to substract the trend. After that do
the DFT.

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