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+/*M///////////////////////////////////////////////////////////////////////////////////////
+//
+//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
+//  By downloading, copying, installing or using the software you agree to this license.
+//  If you do not agree to this license, do not download, install,
+//  copy or use the software.
+//
+// Copyright (C) 2013, Alfonso Sanchez-Beato, all rights reserved.
+// Third party copyrights are property of their respective owners.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+//   * Redistribution's of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//
+//   * Redistribution's in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//
+//   * The name of the copyright holders may not be used to endorse or promote products
+//     derived from this software without specific prior written permission.
+//
+// This software is provided by the copyright holders and contributors "as is" and
+// any express or implied warranties, including, but not limited to, the implied
+// warranties of merchantability and fitness for a particular purpose are disclaimed.
+// In no event shall the contributors be liable for any direct,
+// indirect, incidental, special, exemplary, or consequential damages
+// (including, but not limited to, procurement of substitute goods or services;
+// loss of use, data, or profits; or business interruption) however caused
+// and on any theory of liability, whether in contract, strict liability,
+// or tort (including negligence or otherwise) arising in any way out of
+// the use of this software, even if advised of the possibility of such damage.
+//
+//M*/
+
+#ifndef MAPPER_H_
+#define MAPPER_H_
+
+#include <opencv2/core.hpp> // Basic OpenCV structures (cv::Mat, Scalar)
+#include "map.hpp"
+
+namespace cv {
+namespace reg {
+
+//! @addtogroup reg
+//! @{
+
+/** @brief Base class for modelling an algorithm for calculating a
+
+The class is only used to define the common interface for any possible mapping algorithm.
+ */
+class CV_EXPORTS Mapper
+{
+public:
+    virtual ~Mapper(void) {}
+
+    /*
+     * Calculate mapping between two images
+     * \param[in] img1 Reference image
+     * \param[in] img2 Warped image
+     * \param[in,out] res Map from img1 to img2, stored in a smart pointer. If present as input,
+     *       it is an initial rough estimation that the mapper will try to refine.
+     */
+    virtual void calculate(const cv::Mat& img1, const cv::Mat& img2, cv::Ptr<Map>& res) const = 0;
+
+    /*
+     * Returns a map compatible with the Mapper class
+     * \return Pointer to identity Map
+     */
+    virtual cv::Ptr<Map> getMap(void) const = 0;
+
+protected:
+    /*
+     * Calculates gradient and difference between images
+     * \param[in] img1 Image one
+     * \param[in] img2 Image two
+     * \param[out] Ix Gradient x-coordinate
+     * \param[out] Iy Gradient y-coordinate
+     * \param[out] It Difference of images
+     */
+    void gradient(const cv::Mat& img1, const cv::Mat& img2,
+                  cv::Mat& Ix, cv::Mat& Iy, cv::Mat& It) const;
+
+    /*
+     * Fills matrices with pixel coordinates of an image
+     * \param[in] img Image
+     * \param[out] grid_r Row (y-coordinate)
+     * \param[out] grid_c Column (x-coordinate)
+     */
+    void grid(const Mat& img, Mat& grid_r, Mat& grid_c) const;
+
+    /*
+     * Per-element square of a matrix
+     * \param[in] mat1 Input matrix
+     * \return mat1[i,j]^2
+     */
+    cv::Mat sqr(const cv::Mat& mat1) const
+    {
+        cv::Mat res;
+        res.create(mat1.size(), mat1.type());
+        res = mat1.mul(mat1);
+        return res;
+    }
+};
+
+//! @}
+
+}}  // namespace cv::reg
+
+#endif  // MAPPER_H_
+