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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.
+//
+//
+//                          License Agreement
+//                For Open Source Computer Vision Library
+//
+// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
+// Copyright (C) 2009, Willow Garage Inc., 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 Intel Corporation or 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 OPENCV_STITCHING_SEAM_FINDERS_HPP
+#define OPENCV_STITCHING_SEAM_FINDERS_HPP
+
+#include <set>
+#include "opencv2/core.hpp"
+#include "opencv2/opencv_modules.hpp"
+
+namespace cv {
+namespace detail {
+
+//! @addtogroup stitching_seam
+//! @{
+
+/** @brief Base class for a seam estimator.
+ */
+class CV_EXPORTS SeamFinder
+{
+public:
+    virtual ~SeamFinder() {}
+    /** @brief Estimates seams.
+
+    @param src Source images
+    @param corners Source image top-left corners
+    @param masks Source image masks to update
+     */
+    virtual void find(const std::vector<UMat> &src, const std::vector<Point> &corners,
+                      std::vector<UMat> &masks) = 0;
+};
+
+/** @brief Stub seam estimator which does nothing.
+ */
+class CV_EXPORTS NoSeamFinder : public SeamFinder
+{
+public:
+    void find(const std::vector<UMat>&, const std::vector<Point>&, std::vector<UMat>&) {}
+};
+
+/** @brief Base class for all pairwise seam estimators.
+ */
+class CV_EXPORTS PairwiseSeamFinder : public SeamFinder
+{
+public:
+    virtual void find(const std::vector<UMat> &src, const std::vector<Point> &corners,
+                      std::vector<UMat> &masks);
+
+protected:
+    void run();
+    /** @brief Resolves masks intersection of two specified images in the given ROI.
+
+    @param first First image index
+    @param second Second image index
+    @param roi Region of interest
+     */
+    virtual void findInPair(size_t first, size_t second, Rect roi) = 0;
+
+    std::vector<UMat> images_;
+    std::vector<Size> sizes_;
+    std::vector<Point> corners_;
+    std::vector<UMat> masks_;
+};
+
+/** @brief Voronoi diagram-based seam estimator.
+ */
+class CV_EXPORTS VoronoiSeamFinder : public PairwiseSeamFinder
+{
+public:
+    virtual void find(const std::vector<UMat> &src, const std::vector<Point> &corners,
+                      std::vector<UMat> &masks);
+    virtual void find(const std::vector<Size> &size, const std::vector<Point> &corners,
+                      std::vector<UMat> &masks);
+private:
+    void findInPair(size_t first, size_t second, Rect roi);
+};
+
+
+class CV_EXPORTS DpSeamFinder : public SeamFinder
+{
+public:
+    enum CostFunction { COLOR, COLOR_GRAD };
+
+    DpSeamFinder(CostFunction costFunc = COLOR);
+
+    CostFunction costFunction() const { return costFunc_; }
+    void setCostFunction(CostFunction val) { costFunc_ = val; }
+
+    virtual void find(const std::vector<UMat> &src, const std::vector<Point> &corners,
+                      std::vector<UMat> &masks);
+
+private:
+    enum ComponentState
+    {
+        FIRST = 1, SECOND = 2, INTERS = 4,
+        INTERS_FIRST = INTERS | FIRST,
+        INTERS_SECOND = INTERS | SECOND
+    };
+
+    class ImagePairLess
+    {
+    public:
+        ImagePairLess(const std::vector<Mat> &images, const std::vector<Point> &corners)
+            : src_(&images[0]), corners_(&corners[0]) {}
+
+        bool operator() (const std::pair<size_t, size_t> &l, const std::pair<size_t, size_t> &r) const
+        {
+            Point c1 = corners_[l.first] + Point(src_[l.first].cols / 2, src_[l.first].rows / 2);
+            Point c2 = corners_[l.second] + Point(src_[l.second].cols / 2, src_[l.second].rows / 2);
+            int d1 = (c1 - c2).dot(c1 - c2);
+
+            c1 = corners_[r.first] + Point(src_[r.first].cols / 2, src_[r.first].rows / 2);
+            c2 = corners_[r.second] + Point(src_[r.second].cols / 2, src_[r.second].rows / 2);
+            int d2 = (c1 - c2).dot(c1 - c2);
+
+            return d1 < d2;
+        }
+
+    private:
+        const Mat *src_;
+        const Point *corners_;
+    };
+
+    class ClosePoints
+    {
+    public:
+        ClosePoints(int minDist) : minDist_(minDist) {}
+
+        bool operator() (const Point &p1, const Point &p2) const
+        {
+            int dist2 = (p1.x-p2.x) * (p1.x-p2.x) + (p1.y-p2.y) * (p1.y-p2.y);
+            return dist2 < minDist_ * minDist_;
+        }
+
+    private:
+        int minDist_;
+    };
+
+    void process(
+            const Mat &image1, const Mat &image2, Point tl1, Point tl2,  Mat &mask1, Mat &mask2);
+
+    void findComponents();
+
+    void findEdges();
+
+    void resolveConflicts(
+            const Mat &image1, const Mat &image2, Point tl1, Point tl2, Mat &mask1, Mat &mask2);
+
+    void computeGradients(const Mat &image1, const Mat &image2);
+
+    bool hasOnlyOneNeighbor(int comp);
+
+    bool closeToContour(int y, int x, const Mat_<uchar> &contourMask);
+
+    bool getSeamTips(int comp1, int comp2, Point &p1, Point &p2);
+
+    void computeCosts(
+            const Mat &image1, const Mat &image2, Point tl1, Point tl2,
+            int comp, Mat_<float> &costV, Mat_<float> &costH);
+
+    bool estimateSeam(
+            const Mat &image1, const Mat &image2, Point tl1, Point tl2, int comp,
+            Point p1, Point p2, std::vector<Point> &seam, bool &isHorizontal);
+
+    void updateLabelsUsingSeam(
+            int comp1, int comp2, const std::vector<Point> &seam, bool isHorizontalSeam);
+
+    CostFunction costFunc_;
+
+    // processing images pair data
+    Point unionTl_, unionBr_;
+    Size unionSize_;
+    Mat_<uchar> mask1_, mask2_;
+    Mat_<uchar> contour1mask_, contour2mask_;
+    Mat_<float> gradx1_, grady1_;
+    Mat_<float> gradx2_, grady2_;
+
+    // components data
+    int ncomps_;
+    Mat_<int> labels_;
+    std::vector<ComponentState> states_;
+    std::vector<Point> tls_, brs_;
+    std::vector<std::vector<Point> > contours_;
+    std::set<std::pair<int, int> > edges_;
+};
+
+/** @brief Base class for all minimum graph-cut-based seam estimators.
+ */
+class CV_EXPORTS GraphCutSeamFinderBase
+{
+public:
+    enum CostType { COST_COLOR, COST_COLOR_GRAD };
+};
+
+/** @brief Minimum graph cut-based seam estimator. See details in @cite V03 .
+ */
+class CV_EXPORTS GraphCutSeamFinder : public GraphCutSeamFinderBase, public SeamFinder
+{
+public:
+    GraphCutSeamFinder(int cost_type = COST_COLOR_GRAD, float terminal_cost = 10000.f,
+                       float bad_region_penalty = 1000.f);
+
+    ~GraphCutSeamFinder();
+
+    void find(const std::vector<UMat> &src, const std::vector<Point> &corners,
+              std::vector<UMat> &masks);
+
+private:
+    // To avoid GCGraph dependency
+    class Impl;
+    Ptr<PairwiseSeamFinder> impl_;
+};
+
+
+#ifdef HAVE_OPENCV_CUDALEGACY
+class CV_EXPORTS GraphCutSeamFinderGpu : public GraphCutSeamFinderBase, public PairwiseSeamFinder
+{
+public:
+    GraphCutSeamFinderGpu(int cost_type = COST_COLOR_GRAD, float terminal_cost = 10000.f,
+                          float bad_region_penalty = 1000.f)
+                          : cost_type_(cost_type), terminal_cost_(terminal_cost),
+                            bad_region_penalty_(bad_region_penalty) {}
+
+    void find(const std::vector<cv::UMat> &src, const std::vector<cv::Point> &corners,
+              std::vector<cv::UMat> &masks);
+    void findInPair(size_t first, size_t second, Rect roi);
+
+private:
+    void setGraphWeightsColor(const cv::Mat &img1, const cv::Mat &img2, const cv::Mat &mask1, const cv::Mat &mask2,
+                              cv::Mat &terminals, cv::Mat &leftT, cv::Mat &rightT, cv::Mat &top, cv::Mat &bottom);
+    void setGraphWeightsColorGrad(const cv::Mat &img1, const cv::Mat &img2, const cv::Mat &dx1, const cv::Mat &dx2,
+                                  const cv::Mat &dy1, const cv::Mat &dy2, const cv::Mat &mask1, const cv::Mat &mask2,
+                                  cv::Mat &terminals, cv::Mat &leftT, cv::Mat &rightT, cv::Mat &top, cv::Mat &bottom);
+    std::vector<Mat> dx_, dy_;
+    int cost_type_;
+    float terminal_cost_;
+    float bad_region_penalty_;
+};
+#endif
+
+//! @}
+
+} // namespace detail
+} // namespace cv
+
+#endif // OPENCV_STITCHING_SEAM_FINDERS_HPP