1 ## Copyright (C) 1999,2000 Kai Habel
3 ## This program is free software; you can redistribute it and/or modify
4 ## it under the terms of the GNU General Public License as published by
5 ## the Free Software Foundation; either version 2 of the License, or
6 ## (at your option) any later version.
8 ## This program is distributed in the hope that it will be useful,
9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 ## GNU General Public License for more details.
13 ## You should have received a copy of the GNU General Public License
14 ## along with this program; If not, see <http://www.gnu.org/licenses/>.
17 ## @deftypefn {Function File} {} imhist (@var{I},@var{n})
18 ## @deftypefnx {Function File} {} imhist (@var{I})
19 ## @deftypefnx {Function File} {} imhist (@var{X},@var{cmap})
20 ## @deftypefnx {Function File} {[@var{n,x}] = } imhist (...)
21 ## Shows the histogram of an image using hist.
25 ## Author: Kai Habel <kai.habel@gmx.de>
26 ## July 2000 : Paul Kienzle code simplification for hist() call.
28 function [varargout] = imhist (I, b)
30 if (nargin < 1 || nargin > 2)
38 b_is_colormap = (columns (b) == 3);
43 ## assuming I is an indexed image
45 max_idx = max (max (I));
48 warning ("largest index exceedes length of colormap");
51 ## assuming I is an intensity image
52 ## b is number of bins
59 ## scale image to range [0,1]
64 [nn,xx] = hist (I(:), bins);
65 vr_val_cnt = 1; varargout{vr_val_cnt++} = nn;
66 varargout{vr_val_cnt++} = xx;