Computes the entropy of an image.
The entropy of the elements of the image im is computed as
E = -sum (P .* log2 (P)
where P is the distribution of the elements of im. The distribution
is approximated using a histogram with nbins cells. If im is
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.
See also: entropyfilt.
Package: image