--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main/image/histeq.m	Wed Oct 10 19:54:49 2001 +0000
@@ -0,0 +1,33 @@
+## Copyright (C) 2000  Kai Habel
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 2 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program; if not, write to the Free Software
+## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+## -*- texinfo -*-
+## @deftypefn {Function File} @var{J}= histeq (@var{I},@var{n})
+## histogram equalization
+## @end deftypefn
+
+## Author:	Kai Habel <kai.habel@gmx.de>
+## Date:	08. August 2000
+
+function J = histeq (I, n)
+
+  [r,c] = size (I); 
+  [X,map] = gray2ind(I);
+  [nn,xx] = imhist(I);
+  Icdf = ceil (n * cumsum (1/prod(size(I)) * nn));
+  J = reshape(Icdf(X),r,c);
+  plot(Icdf,'b;;');
+endfunction