% -*- texinfo -*- % @deftypefn {Function File} {@var{E} =} entropy (@var{im}) % @deftypefnx{Function File} {@var{E} =} entropy (@var{im}, @var{nbins}) % Computes the entropy of an image. % % The entropy of the elements of the image @var{im} is computed as % % @example % @var{E} = -sum (@var{P} .* log2 (@var{P}) % @end example % % where @var{P} is the distribution of the elements of @var{im}. The distribution % is approximated using a histogram with @var{nbins} cells. If @var{im} is % @code{logical} then two cells are used by default. For other classes 256 cells % are used by default. % % When the entropy is computed, zero-valued cells of the histogram are ignored. % % @seealso{entropyfilt} % @end deftypefn

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