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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_UTIL_HPP
+#define OPENCV_STITCHING_UTIL_HPP
+
+#include <list>
+#include "opencv2/core.hpp"
+
+namespace cv {
+namespace detail {
+
+//! @addtogroup stitching
+//! @{
+
+class CV_EXPORTS DisjointSets
+{
+public:
+    DisjointSets(int elem_count = 0) { createOneElemSets(elem_count); }
+
+    void createOneElemSets(int elem_count);
+    int findSetByElem(int elem);
+    int mergeSets(int set1, int set2);
+
+    std::vector<int> parent;
+    std::vector<int> size;
+
+private:
+    std::vector<int> rank_;
+};
+
+
+struct CV_EXPORTS GraphEdge
+{
+    GraphEdge(int from, int to, float weight);
+    bool operator <(const GraphEdge& other) const { return weight < other.weight; }
+    bool operator >(const GraphEdge& other) const { return weight > other.weight; }
+
+    int from, to;
+    float weight;
+};
+
+inline GraphEdge::GraphEdge(int _from, int _to, float _weight) : from(_from), to(_to), weight(_weight) {}
+
+
+class CV_EXPORTS Graph
+{
+public:
+    Graph(int num_vertices = 0) { create(num_vertices); }
+    void create(int num_vertices) { edges_.assign(num_vertices, std::list<GraphEdge>()); }
+    int numVertices() const { return static_cast<int>(edges_.size()); }
+    void addEdge(int from, int to, float weight);
+    template <typename B> B forEach(B body) const;
+    template <typename B> B walkBreadthFirst(int from, B body) const;
+
+private:
+    std::vector< std::list<GraphEdge> > edges_;
+};
+
+
+//////////////////////////////////////////////////////////////////////////////
+// Auxiliary functions
+
+CV_EXPORTS bool overlapRoi(Point tl1, Point tl2, Size sz1, Size sz2, Rect &roi);
+CV_EXPORTS Rect resultRoi(const std::vector<Point> &corners, const std::vector<UMat> &images);
+CV_EXPORTS Rect resultRoi(const std::vector<Point> &corners, const std::vector<Size> &sizes);
+CV_EXPORTS Rect resultRoiIntersection(const std::vector<Point> &corners, const std::vector<Size> &sizes);
+CV_EXPORTS Point resultTl(const std::vector<Point> &corners);
+
+// Returns random 'count' element subset of the {0,1,...,size-1} set
+CV_EXPORTS void selectRandomSubset(int count, int size, std::vector<int> &subset);
+
+CV_EXPORTS int& stitchingLogLevel();
+
+//! @}
+
+} // namespace detail
+} // namespace cv
+
+#include "util_inl.hpp"
+
+#endif // OPENCV_STITCHING_UTIL_HPP