how to find spatial frequency of color image

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mohammad shafi bhatt
mohammad shafi bhatt on 17 Oct 2013
Commented: Image Analyst on 10 Nov 2013
i have fused two images and now i want to find the spatial frequency of fused image can anyone please help

Answers (2)

Image Analyst
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.
Image Analyst
Image Analyst on 10 Nov 2013
I said you can use fft2() to get the spatial frequencies. I don't know what "fusion mutual information" is.

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Jan on 6 Nov 2013
You probably want to analyze the structure of the image's 2d fourier transform using fft2(). Either for each channel or after conversion to a gray image.

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