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well, you're half right, - it supports only 1dim arrays.
and you're probably half wrong, too, - it is not meant to be used with images at all .
look at the docs, "a single column floating-point matrix. Each row is the value of the histogram in each bin." - so it's meant to compare histograms, not images.
(if you want to compare images with the L1 norm, that's a straight double dist = norm(a,b,NORM_L1); )
