FFT filter conversion to real space

Posted by G. Esteban Fernandez on Dec 24, 2008; 2:20pm
URL: http://imagej.273.s1.nabble.com/FFT-filter-conversion-to-real-space-tp3694163.html

Hello all,

I have a slit-scanning confocal in my facility that sometimes introduces
vertical line artifacts into images.  I use ImageJ to correct these defects
in frequency space; I make a thin horz. rectangle through the middle of the
FFT map, except through the very center.  How can I do the same filtering in
real space?  I'm looking for a kernel that I can use in other programs that
don't have Fourier capabilities.  (sample images and mask at
http://www.missouri.edu/~fernandezg/FFT)

On a related note, can people suggest a resource/reference for converting
Fourier filters to real space in general?

Thanks and Happy Holidays!

-Esteban

--
G. Esteban Fernandez, Ph.D.
Associate Director
Molecular Cytology Core Facility
University of Missouri
120 Bond Life Sciences Center
Columbia, MO  65211

http://www.biotech.missouri.edu/mcc/

573-882-4895
573-884-9395 fax