frequency domain filtering using a mask

Posted by Mike Morrione on May 02, 2015; 7:17pm
URL: http://imagej.273.s1.nabble.com/frequency-domain-filtering-using-a-mask-tp5012677.html

New to imageJ

I have two images. First image is a uniform mesh and the 2nd image is the same mesh with a defect ( a small round dot). Images are black and white.

I am experimenting with finding a defect based on a reference image (image without defects). I believe I should be able to take the difference of the FFT's of each and use the result to locate the defect after inverse transform.

However after taking the difference using image calculator the result is no longer in the frequency domain so I can not do the inverse transform.

I would appreciate any help.

Thank you.

Mike

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