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diff --git a/labelled_image_pool_subset.cc b/labelled_image_pool_subset.cc
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+++ b/labelled_image_pool_subset.cc
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+
+///////////////////////////////////////////////////////////////////////////
+// This program is free software: you can redistribute it and/or modify  //
+// it under the terms of the version 3 of the GNU General Public License //
+// as published by the Free Software Foundation.                         //
+//                                                                       //
+// 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, see <http://www.gnu.org/licenses/>.  //
+//                                                                       //
+// Written by Francois Fleuret, (C) IDIAP                                //
+// Contact <francois.fleuret@idiap.ch> for comments & bug reports        //
+///////////////////////////////////////////////////////////////////////////
+
+#include "labelled_image_pool_subset.h"
+
+LabelledImagePoolSubset::LabelledImagePoolSubset(LabelledImagePool *mother_pool,
+                                                 bool *used) {
+  _mother_pool = mother_pool;
+  _nb_images = 0;
+  for(int n = 0; n < _mother_pool->nb_images(); n++)
+    if(used[n]) _nb_images++;
+  _indexes = new int[_nb_images];
+  int k = 0;
+  for(int n = 0; n < _mother_pool->nb_images(); n++)
+    if(used[n]) _indexes[k++] = n;
+}
+
+LabelledImagePoolSubset::~LabelledImagePoolSubset() {
+  delete[] _indexes;
+}
+
+int LabelledImagePoolSubset::nb_images() {
+  return _nb_images;
+}
+
+LabelledImage *LabelledImagePoolSubset::grab_image(int n_image) {
+  return _mother_pool->grab_image(_indexes[n_image]);
+}
+
+void LabelledImagePoolSubset::release_image(int n_image) {
+  _mother_pool->release_image(_indexes[n_image]);
+}