changeset 113:028599837f1d sup_158_IMG_Processing_toolbox_

Reimplementation of showdict.m function from KSVD toolbox - Image Processing toolbox independent.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util/SMALL_showdict.m	Tue May 24 15:13:41 2011 +0100
@@ -0,0 +1,119 @@
+function x = SMALL_showdict(D,sz,n,m,varargin)
+%% SMALL_SHOWDICT Display a dictionary of image patches.
+%%  Reimplementation of showdict function from KSVD toolbox with Image
+%%  Processing toolbox dependecies removed
+%
+%  SMALL_SHOWDICT(D,SZ,N,M) displays the contents of the dictionary D, whos
+%  columns are 2-D image patches (in column-major order). SZ = [SX SY] is
+%  the size of the image patches. SHOWDICT displays the atoms on an N x M
+%  grid. If there are more atoms in D then only the first N*M are
+%  displayed.
+%
+%  SMALL_SHOWDICT(...,'lines') separates the dictionary atoms by black lines.
+%  SMALL_SHOWDICT(...,'whitelines') separates the dictionary atoms by white
+%  lines.
+%
+%  SMALL_SHOWDICT(...,'linewidth',W) when used with either 'lines' or
+%  'whitelines' sets the width of the lines to W pixels (default=1).
+%
+%  SMALL_SHOWDICT(...,'highcontrast') increases the contrast of the figure by
+%  normalizing the intensity values of each atom individually to the range
+%  of [0,1] (the default behavior is to normalize the values of the entire
+%  figure to [0,1] as one image). Note that in this way, the relative
+%  intensities of the atoms are not maintained.
+%
+%  X = SMALL_SHOWDICT(...) returns a bitmat of the dictionary image without
+%  displaying the figure.
+
+
+%   Centre for Digital Music, Queen Mary, University of London.
+%   This file copyright 2011 Ivan Damnjanovic.
+%
+%   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.  See the file
+%   COPYING included with this distribution for more information.
+%   
+%%
+
+if (size(D,2) < n*m)
+  D = [D zeros(size(D,1),n*m-size(D,2))];
+end
+
+
+%%%  parse input arguments  %%%
+
+linewidth = 1;
+highcontrast = 0;
+drawlines = 0;
+linecolor = 0;
+
+for i = 1:length(varargin)
+  if (~ischar(varargin{i}))
+    continue;
+  end
+  switch(varargin{i})
+    case 'highcontrast'
+      highcontrast = 1;
+    case 'lines'
+      drawlines = 1;
+    case 'whitelines'
+      drawlines = 1;
+      linecolor = 1;
+    case 'linewidth'
+      linewidth = varargin{i+1};
+  end
+end
+
+
+
+%%%  create dictionary image  %%%
+
+
+if (drawlines)
+  
+  D = [D ; nan(sz(1)*linewidth,size(D,2))];
+  sz(2) = sz(2)+linewidth;
+  x = col2imstep(D(:,1:n*m),[n m].*sz, sz, sz);
+  sz = [sz(2) sz(1)];
+  D = im2colstep(x',sz, sz);
+  D = [D ; nan(sz(1)*linewidth,size(D,2))];
+  sz(2) = sz(2)+linewidth;
+  x = col2imstep(D(:,1:n*m),[m n].*sz,sz,sz);
+  x = x';
+  x = x(1:end-linewidth,1:end-linewidth);
+  
+  if (highcontrast)
+    for i = 0:n-1
+      for j = 0:m-1
+        x(i*sz(1)+1:i*sz(1)+sz(1)-linewidth, j*sz(2)+1:j*sz(2)+sz(2)-linewidth) = ...
+          imnormalize(x(i*sz(1)+1:i*sz(1)+sz(1)-linewidth, j*sz(2)+1:j*sz(2)+sz(2)-linewidth));
+      end
+    end
+  else
+    x = imnormalize(x);
+  end
+  
+  x(isnan(x)) = linecolor;
+  
+else
+  
+  x = col2imstep(D(:,1:n*m),[n m].*sz, sz, sz);
+  
+  if (highcontrast)
+    for i = 0:n-1
+      for j = 0:m-1
+        x(i*sz(1)+1:i*sz(1)+sz(1), j*sz(2)+1:j*sz(2)+sz(2)) = ...
+          imnormalize(x(i*sz(1)+1:i*sz(1)+sz(1), j*sz(2)+1:j*sz(2)+sz(2)));
+      end
+    end
+  else
+    x = imnormalize(x);
+  end
+end
+
+
+if (nargout==0)
+    imagesc(dictimg);colormap(gray);axis off; axis image; 
+end