How to find wavelength of a surface that I have generated using fft2?

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Mustafa Rifat 2020-2-18

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https://ww2.mathworks.cn/matlabcentral/answers/506290-how-to-find-wavelength-of-a-surface-that-i-have-generated-using-fft2

评论： Mustafa Rifat 2020-2-21

Hi, I have a surface profile like the first image. I performed fft2 to find the second image. x and y-axes values are in pixels. I have 2 questions.

What does the second image mean physically?
Most importantly, how to find the wavelength present in the surface?

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David Goodmanson 2020-2-21

Hi Mustafa,

since the first image is in color, how do you deal with taking the fft? Is this a case where the image is basically a grayscale image, with color being supplied by a color map with an assoiciated color bar?

Mustafa Rifat 2020-2-21

yes. The color is representative of height at different points, mathced by a colorbar.

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