Linear Image Filtering via FFT

Posted by H. Gluender on Aug 04, 2006; 7:06pm
URL: http://imagej.273.s1.nabble.com/Linear-Image-Filtering-via-FFT-tp3701886.html

Dear experts,

just an observation of a slight discrepancy when applying a _binary_
filter function to the Fourier spectrum of an image by using "FFT >
Custom Filter" and "FFT > FFT" > spectral masking > "FFT > Inverse
FFT":

With the former approach more "ringing" is observed - why?

Any ideas?

Best

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                   Herbie

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          <http://www.gluender.de>