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why ripples are forming after IFFT(theoretical explanation needed)?

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kumara dommeti
kumara dommeti 2020-11-22
评论： Image Analyst 2020-11-23
I have an intensity image. I want to know how these ripples are formed after IFFT theoretically? And how it is dependent on orientation from the origin and widths?

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Image Analyst
Image Analyst 2020-11-22
The ripples could be formed if you did a low pass filter. It's the high frequencies that help form flat regions, steps, edges, sharp ridges, etc. -- they keep the surfaces flat and straight. If you remove those with a low pass filter, all you'll be left with are the low frequencies with no high frequencies to keep the surfaces and profiles straight and flat.
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kumara dommeti
kumara dommeti 2020-11-22
What is the impact of placing x(10:20,10:20)=randn(11,11) near and far from the origin?
Image Analyst
Image Analyst 2020-11-22
Well of course the image would look different. And so would the fft, especially the phase image.

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