comparison toolboxes/FullBNT-1.0.7/KPMtools/nonmaxsup.m @ 0:e9a9cd732c1e tip

first hg version after svn

+% NONMAXSUP - Non-maximal Suppression
+%
+% Usage:  cim = nonmaxsup(im, radius)
+%
+% Arguments:   
+%            im     - image to be processed.
+%            radius - radius of region considered in non-maximal
+%                     suppression (optional). Typical values to use might
+%                     be 1-3.  Default is 1.
+%
+% Returns:
+%            cim    - image with pixels that are not maximal within a 
+%                     square neighborhood zeroed out.
+
+% Copyright (C) 2002 Mark A. Paskin
+%
+% 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.
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+function cim = nonmaxsup(m, radius)
+  if (nargin == 1) radius = 1; end
+  % Extract local maxima by performing a grey scale morphological
+  % dilation and then finding points in the corner strength image that
+  % match the dilated image and are also greater than the threshold.
+  sze = 2 * radius + 1;                   % Size of mask.
+  mx = ordfilt2(m, sze^2, ones(sze));   % Grey-scale dilate.
+  cim = sparse(m .* (m == mx));
+
+