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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_BLENDERS_HPP
+#define OPENCV_STITCHING_BLENDERS_HPP
+
+#if defined(NO)
+#  warning Detected Apple 'NO' macro definition, it can cause build conflicts. Please, include this header before any Apple headers.
+#endif
+
+#include "opencv2/core.hpp"
+
+namespace cv {
+namespace detail {
+
+//! @addtogroup stitching_blend
+//! @{
+
+/** @brief Base class for all blenders.
+
+Simple blender which puts one image over another
+*/
+class CV_EXPORTS Blender
+{
+public:
+    virtual ~Blender() {}
+
+    enum { NO, FEATHER, MULTI_BAND };
+    static Ptr<Blender> createDefault(int type, bool try_gpu = false);
+
+    /** @brief Prepares the blender for blending.
+
+    @param corners Source images top-left corners
+    @param sizes Source image sizes
+     */
+    void prepare(const std::vector<Point> &corners, const std::vector<Size> &sizes);
+    /** @overload */
+    virtual void prepare(Rect dst_roi);
+    /** @brief Processes the image.
+
+    @param img Source image
+    @param mask Source image mask
+    @param tl Source image top-left corners
+     */
+    virtual void feed(InputArray img, InputArray mask, Point tl);
+    /** @brief Blends and returns the final pano.
+
+    @param dst Final pano
+    @param dst_mask Final pano mask
+     */
+    virtual void blend(InputOutputArray dst, InputOutputArray dst_mask);
+
+protected:
+    UMat dst_, dst_mask_;
+    Rect dst_roi_;
+};
+
+/** @brief Simple blender which mixes images at its borders.
+ */
+class CV_EXPORTS FeatherBlender : public Blender
+{
+public:
+    FeatherBlender(float sharpness = 0.02f);
+
+    float sharpness() const { return sharpness_; }
+    void setSharpness(float val) { sharpness_ = val; }
+
+    void prepare(Rect dst_roi);
+    void feed(InputArray img, InputArray mask, Point tl);
+    void blend(InputOutputArray dst, InputOutputArray dst_mask);
+
+    //! Creates weight maps for fixed set of source images by their masks and top-left corners.
+    //! Final image can be obtained by simple weighting of the source images.
+    Rect createWeightMaps(const std::vector<UMat> &masks, const std::vector<Point> &corners,
+                          std::vector<UMat> &weight_maps);
+
+private:
+    float sharpness_;
+    UMat weight_map_;
+    UMat dst_weight_map_;
+};
+
+inline FeatherBlender::FeatherBlender(float _sharpness) { setSharpness(_sharpness); }
+
+/** @brief Blender which uses multi-band blending algorithm (see @cite BA83).
+ */
+class CV_EXPORTS MultiBandBlender : public Blender
+{
+public:
+    MultiBandBlender(int try_gpu = false, int num_bands = 5, int weight_type = CV_32F);
+
+    int numBands() const { return actual_num_bands_; }
+    void setNumBands(int val) { actual_num_bands_ = val; }
+
+    void prepare(Rect dst_roi);
+    void feed(InputArray img, InputArray mask, Point tl);
+    void blend(InputOutputArray dst, InputOutputArray dst_mask);
+
+private:
+    int actual_num_bands_, num_bands_;
+    std::vector<UMat> dst_pyr_laplace_;
+    std::vector<UMat> dst_band_weights_;
+    Rect dst_roi_final_;
+    bool can_use_gpu_;
+    int weight_type_; //CV_32F or CV_16S
+};
+
+
+//////////////////////////////////////////////////////////////////////////////
+// Auxiliary functions
+
+void CV_EXPORTS normalizeUsingWeightMap(InputArray weight, InputOutputArray src);
+
+void CV_EXPORTS createWeightMap(InputArray mask, float sharpness, InputOutputArray weight);
+
+void CV_EXPORTS createLaplacePyr(InputArray img, int num_levels, std::vector<UMat>& pyr);
+void CV_EXPORTS createLaplacePyrGpu(InputArray img, int num_levels, std::vector<UMat>& pyr);
+
+// Restores source image
+void CV_EXPORTS restoreImageFromLaplacePyr(std::vector<UMat>& pyr);
+void CV_EXPORTS restoreImageFromLaplacePyrGpu(std::vector<UMat>& pyr);
+
+//! @}
+
+} // namespace detail
+} // namespace cv
+
+#endif // OPENCV_STITCHING_BLENDERS_HPP