I computed the acf of an image with the following code:
%# read in image Img = imread('myImage.tif'); % get size of image [N, M] = size(Img); %# convert to double I = double(Img); %# subtract mean I = I-mean(I(:)); %# normalize magnitude I = I/sqrt(sum(I(:).^2)); %# compute acf fft_I = fft2(I); Acf = real(fftshift(ifft2(fft_I.*conj(fft_I))));
Now, i have to mathematically describe the procedure, and I am thinking that the FFT equation given in https://uk.mathworks.com/help/matlab/ref/fft2.html (scroll to the bottom) isn't enough?
Can someone please help me out here. Many thanks.