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/* dt - imutil.h
*
* Copyright (C) 2006 Pedro Felzenszwalb
*
* 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
*/
/* some image utilities */
#ifndef IMUTIL_H
#define IMUTIL_H
#include "image.h"
#include "misc.h"
/* compute minimum and maximum value in an image */
template <class T>
void min_max(image<T> *im, T *ret_min, T *ret_max) {
int width = im->width();
int height = im->height();
T min = imRef(im, 0, 0);
T max = imRef(im, 0, 0);
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
T val = imRef(im, x, y);
if (min > val)
min = val;
if (max < val)
max = val;
}
}
*ret_min = min;
*ret_max = max;
}
/* threshold image */
template <class T>
image<uchar> *threshold(image<T> *src, int t) {
int width = src->width();
int height = src->height();
image<uchar> *dst = new image<uchar>(width, height);
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
imRef(dst, x, y) = (imRef(src, x, y) >= t);
}
}
return dst;
}
#endif
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