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

6 Mar 2019
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Updated 6 Mar 2019
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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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Ziwei Liu
Ziwei Liu on 6 Mar 2019
I'm trying to find the max frequency, not the one with max magnitude

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 Accepted Answer

Walter Roberson
Walter Roberson on 6 Mar 2019

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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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