Matlab pixel and histogram distance

Question

are there any matlab functions that perform the following :

NxM are the dimensions of the image. I,j are the pixel value(Red for chanel 1, Green for chanel 2, Blue for chanel 3).

Answer 1

You can calculate the first distance by

d1 = sqrt(sum((A(:)-B(:)).^2));

and the second by

% Create histograms
hA = hist(A(:),255);
hB = hist(B(:),255);

% Calculate distance
d2 = sqrt(sum((hA-hB).^2));