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diff --git a/tools/shapegame/dt/imutil.h b/tools/shapegame/dt/imutil.h
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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
+