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

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Mustafa Rifat
Mustafa Rifat am 18 Feb. 2020
Kommentiert: Mustafa Rifat am 21 Feb. 2020
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.
  1. What does the second image mean physically?
  2. Most importantly, how to find the wavelength present in the surface?
  2 Kommentare
David Goodmanson
David Goodmanson am 21 Feb. 2020
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
Mustafa Rifat am 21 Feb. 2020
yes. The color is representative of height at different points, mathced by a colorbar.

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