how to do FFT for PART on an image?
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I want to compare the following two images based on their Fourier Transform. However, I am only interested in the circular region. Is it possible to do FFT for part on an image?
tnx in advance
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Image Analyst
2014-8-3
Not sure what you're looking for. Since your second image has a circular mask multiplied by the first image, your second spectrum will be the same as the first spectrum, just convolved with a narrow sombrero function.
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Image Analyst
2014-8-3
I think you do not understand what the Fourier transform represents. There is no one-to-one correspondence with a region in the spatial domain with a certain finite, compact region in the Fourier domain. There is no "mapping" as you called it. Low frequencies are near the center and high frequencies are away from the center, but that's about as "mapped" as you can call it.
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