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diff --git a/source/blender/freestyle/intern/image/ImagePyramid.h b/source/blender/freestyle/intern/image/ImagePyramid.h
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+//
+//  Filename         : ImagePyramid.h
+//  Author(s)        : Stephane Grabli
+//  Purpose          : Class to represent a pyramid of images
+//  Date of creation : 25/12/2003
+//
+///////////////////////////////////////////////////////////////////////////////
+
+
+//
+//  Copyright (C) : Please refer to the COPYRIGHT file distributed 
+//   with this source distribution. 
+//
+//  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.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef  IMAGEPYRAMID_H
+# define IMAGEPYRAMID_H
+
+#include "../system/FreestyleConfig.h"
+#include <vector>
+
+class GrayImage;
+class LIB_IMAGE_EXPORT ImagePyramid{
+protected:
+  std::vector<GrayImage*> _levels;
+  
+public:
+  ImagePyramid(){}
+  ImagePyramid(const ImagePyramid& iBrother);
+  //ImagePyramid(const GrayImage& level0, unsigned nbLevels);
+  virtual ~ImagePyramid();
+
+  /*! Builds the pyramid.
+   * must be overloaded by inherited classes.
+   * if nbLevels==0, the complete pyramid is built
+   */
+  virtual void BuildPyramid(const GrayImage& level0, unsigned nbLevels) = 0;
+  
+  /*! Builds a pyramid without copying the base level */
+  virtual void BuildPyramid(GrayImage* level0, unsigned nbLevels) = 0;
+  
+  virtual GrayImage * getLevel(int l);
+  /*! Returns the pixel x,y using bilinear interpolation.
+   *  \param x
+   *    the abscissa specified in the finest level coordinate system
+   *  \param y
+   *    the ordinate specified in the finest level coordinate system
+   *  \param level
+   *    the level from which we want the pixel to be evaluated
+   */
+  virtual float pixel(int x, int y, int level=0);
+  /*! Returns the width of the level-th level image */
+  virtual int width(int level=0);
+  /*! Returns the height of the level-th level image */
+  virtual int height(int level=0);
+  /*! Returns the number of levels in the pyramid */
+  inline int getNumberOfLevels() const { return _levels.size();}
+}; 
+
+class LIB_IMAGE_EXPORT GaussianPyramid : public ImagePyramid
+{
+protected:
+  float _sigma;
+public:
+  GaussianPyramid(float iSigma=1.f) : ImagePyramid() {_sigma=iSigma;}
+  GaussianPyramid(const GrayImage& level0, unsigned nbLevels, float iSigma=1.f);
+  GaussianPyramid(GrayImage* level0, unsigned nbLevels, float iSigma=1.f);
+  GaussianPyramid(const GaussianPyramid& iBrother);
+  virtual ~GaussianPyramid(){}
+
+  virtual void BuildPyramid(const GrayImage& level0, unsigned nbLevels);
+  virtual void BuildPyramid(GrayImage* level0, unsigned nbLevels);
+  /* accessors */
+  inline float getSigma() const {return _sigma;}
+  /* modifiers */
+
+};
+#endif // IMAGEPYRAMID_H