Matlab code for calculating local spatial frquency of an image?

Code for calculating local spatial frequency of an image?

Answer 1

[Image Analyst]

What do you mean by local? I'd guess you're wanting either the fft2() function, or the wavelet toolbox. See attached demos for fft2. Also, see this: http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

[arnold]

My guess is he was looking for something like this - which is actually what I'm looking for (for Matlab):

https://imagej.net/Helmholtz_Analysis

I don't know if Helmholtz analysis is the proper term for it, but this ImageJ plugin gives local frequency and direction.

It would be even more interesting to get the entire spectrum, amplitude and direction locally. I'm confident this has a term or name to it and has probably been solved and implemented many times, that's why I keep looking to.