[Octave-cvsupdate] SF.net SVN: octave:[7511] trunk/octave-forge/main/image/inst/mmgradm.m

[<car...@us...>]

Revision: 7511
          http://octave.svn.sourceforge.net/octave/?rev=7511&view=rev
Author:   carandraug
Date:     2010-08-11 23:25:11 +0000 (Wed, 11 Aug 2010)

Log Message:
-----------
Added new function for morphological operations (morphological gradient)

Added Paths:
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    trunk/octave-forge/main/image/inst/mmgradm.m

Added: trunk/octave-forge/main/image/inst/mmgradm.m
===================================================================
--- trunk/octave-forge/main/image/inst/mmgradm.m	                        (rev 0)
+++ trunk/octave-forge/main/image/inst/mmgradm.m	2010-08-11 23:25:11 UTC (rev 7511)
@@ -0,0 +1,49 @@
+## Copyright (C) 2010 Carnë Draug <car...@gm...>
+##
+## 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 3 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, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} @var{grad} = mmgradm(@var{A}, @var{se})
+## @deftypefnx {Function File} @var{grad} = mmgradm(@var{A}, @var{se_dil}, @var{se_ero})
+## Calculates the morphological gradient @var{grad} of a given image @var{A}.
+##
+## In the first form, the same structuring element @var{se} is used for dilation
+## and erosion. In the second form, @var{se_dil} and @var{se_ero} are the
+## corresponding structuring elements used for dilation and erosion
+##
+## The image @var{A} must be a grayscale or a binary image.
+##
+## The morphological gradient of a image corresponds to its erosion subtracted
+## to its dilation.
+##
+## @seealso{imerode, imdilate, imopen, imclose, imtophat}
+## @end deftypefn
+
+function grad = mmgradm (im, se_dil, se_ero)
+
+  if (nargin == 1)
+    error ("Structuring element must be specified");
+  elseif (nargin == 2)
+    se_ero = se_dil;
+  elseif (nargin == 3)
+    # all is good
+  else
+    print_usage;
+  endif
+
+  dilated = imdilate(im, se_dil);
+  eroded  = imerode(im, se_ero);
+
+  grad = dilated - eroded;
+endfunction


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