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I need to do a FFT on an image for noise reduction, but the problem is that I do not need the complete image, but only a circle in the middle. The borders are a fixed rig, thus I am not interested in what it displays, but it has an impact on the result of the FFT.
Is there any way to just cut out a circular part and use that for the FFT? Note that if I use black
background, the edge between background, and image data will have quite an impact.
This was answered on signal processing (http://dsp.stackexchange.com/questions/2130/fft-on-non-rectangular-part-of-image).