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How to find maximum frequency of a 2D image after fourier transform?

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Ziwei Liu
Ziwei Liu 2019-3-6
回答： Walter Roberson 2019-3-6
Hi,
I have a 2D grayscale image I, and I've done fourier transform using fft, with center shifted (fftshift). I want to find the maximum frequency of the image. Are there any way to do this?

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Walter Roberson
Walter Roberson 2019-3-6
maximum frequency is max(size(TheImage))/2
In theory the coefficient associated with that frequency could be 0, but it is unlikely to be 0.

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