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

7 次查看（过去 30 天）
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?

请先登录，再回答此问题。

采纳的回答

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.
  4 个评论
显示 2更早的评论
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.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Fourier Analysis and Filtering 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by