how to find spatial frequency of color image
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Image Analyst on 6 Nov 2013
You can calculate the 2D FFT of an image. The image must be a 2D image, not a 3D color image. So you can convert that to gray scale using rgb2gray(), or you can use the red, green, or blue channel, or you can convert to another colorspace such as lab or hsv (using rgb2hsv() function) and then do the FFT of the h, s, or v channel. It all depends on what you want to do with the information once you get it.