Added GPU version of PyrLK based global motion estimator (videostab)

modules/gpu/src/cuda/global_motion.cu

@@ -0,0 +1,65 @@
+/*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.
+// Copyright (C) 1993-2011, NVIDIA Corporation, 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 bpied warranties, including, but not limited to, the bpied
+// 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*/
+
+#include "thrust/device_ptr.h"
+#include "thrust/remove.h"
+#include "thrust/functional.h"
+#include "internal_shared.hpp"
+
+using namespace thrust;
+
+namespace cv { namespace gpu { namespace device {
+
+int compactPoints(int N, float *points0, float *points1, const uchar *mask)
+{
+    thrust::device_ptr<float2> dpoints0((float2*)points0);
+    thrust::device_ptr<float2> dpoints1((float2*)points1);
+    thrust::device_ptr<const uchar> dmask(mask);
+
+    return thrust::remove_if(thrust::make_zip_iterator(thrust::make_tuple(dpoints0, dpoints1)),
+                             thrust::make_zip_iterator(thrust::make_tuple(dpoints0 + N, dpoints1 + N)),
+                             dmask, thrust::not1(thrust::identity<uchar>()))
+           - make_zip_iterator(make_tuple(dpoints0, dpoints1));
+}
+
+}}}