text: #if defined _MSC_VER && _MSC_VER >= 1400
  #pragma warning( disable : 4201 4408 4127 4100)
  #endif
  
  #include <iostream>
  #include <iomanip>
  #include <memory>
  #include <exception>
  #include <ctime>
  #include <ctype.h>
  
  #include "cvconfig.h"
  #include <iostream>
  #include <iomanip>
  #include "opencv2/core/cuda.hpp"
  #include "opencv2/cudalegacy.hpp"
  #include "opencv2/highgui.hpp"
  
  #if !defined(HAVE_CUDA)
  int main( int, const char** )
  {
      std::cout << "Please compile the library with CUDA support" << std::endl;
      return -1;
  }
  #else
  
  //using std::shared_ptr;
  using cv::Ptr;
  
  #define PARAM_LEFT  "--left"
  #define PARAM_RIGHT "--right"
  #define PARAM_SCALE "--scale"
  #define PARAM_ALPHA "--alpha"
  #define PARAM_GAMMA "--gamma"
  #define PARAM_INNER "--inner"
  #define PARAM_OUTER "--outer"
  #define PARAM_SOLVER "--solver"
  #define PARAM_TIME_STEP "--time-step"
  #define PARAM_HELP "--help"
  
  Ptr<INCVMemAllocator> g_pGPUMemAllocator;
  Ptr<INCVMemAllocator> g_pHostMemAllocator;
  
  class RgbToMonochrome
  {
  public:
      float operator ()(unsigned char b, unsigned char g, unsigned char r)
      {
          float _r = static_cast<float>(r)/255.0f;
          float _g = static_cast<float>(g)/255.0f;
          float _b = static_cast<float>(b)/255.0f;
          return (_r + _g + _b)/3.0f;
      }
  };
  
  class RgbToR
  {
  public:
      float operator ()(unsigned char /*b*/, unsigned char /*g*/, unsigned char r)
      {
          return static_cast<float>(r)/255.0f;
      }
  };
  
  
  class RgbToG
  {
  public:
      float operator ()(unsigned char /*b*/, unsigned char g, unsigned char /*r*/)
      {
          return static_cast<float>(g)/255.0f;
      }
  };
  
  class RgbToB
  {
  public:
      float operator ()(unsigned char b, unsigned char /*g*/, unsigned char /*r*/)
      {
          return static_cast<float>(b)/255.0f;
      }
  };
  
  template<class T>
  NCVStatus CopyData(IplImage *image, Ptr<NCVMatrixAlloc<Ncv32f> >& dst)
  {
      dst = Ptr<NCVMatrixAlloc<Ncv32f> > (new NCVMatrixAlloc<Ncv32f> (*g_pHostMemAllocator, image->width, image->height));
      ncvAssertReturn (dst->isMemAllocated (), NCV_ALLOCATOR_BAD_ALLOC);
  
      unsigned char *row = reinterpret_cast<unsigned char*> (image->imageData);
      T convert;
      for (int i = 0; i < image->height; ++i)
      {
          for (int j = 0; j < image->width; ++j)
          {
              if (image->nChannels < 3)
              {
                  dst->ptr ()[j + i*dst->stride ()] = static_cast<float> (*(row + j*image->nChannels))/255.0f;
              }
              else
              {
                  unsigned char *color = row + j * image->nChannels;
                  dst->ptr ()[j +i*dst->stride ()] = convert (color[0], color[1], color[2]);
              }
          }
          row += image->widthStep;
      }
      return NCV_SUCCESS;
  }
  
  template<class T>
  NCVStatus CopyData(const IplImage *image, const NCVMatrixAlloc<Ncv32f> &dst)
  {
      unsigned char *row = reinterpret_cast<unsigned char*> (image->imageData);
      T convert;
      for (int i = 0; i < image->height; ++i)
      {
          for (int j = 0; j < image->width; ++j)
          {
              if (image->nChannels < 3)
              {
                  dst.ptr ()[j + i*dst.stride ()] = static_cast<float>(*(row + j*image->nChannels))/255.0f;
              }
              else
              {
                  unsigned char *color = row + j * image->nChannels;
                  dst.ptr ()[j +i*dst.stride()] = convert (color[0], color[1], color[2]);
              }
          }
          row += image->widthStep;
      }
      return NCV_SUCCESS;
  }
  
  static NCVStatus LoadImages (const char *frame0Name,
                        const char *frame1Name,
                        int &width,
                        int &height,
                        Ptr<NCVMatrixAlloc<Ncv32f> > &src,
                        Ptr<NCVMatrixAlloc<Ncv32f> > &dst,
                        IplImage *&firstFrame,
                        IplImage *&lastFrame)
  {
      IplImage *image;
      image = cvLoadImage (frame0Name);
      if (image == 0)
      {
          std::cout << "Could not open '" << frame0Name << "'\n";
          return NCV_FILE_ERROR;
      }
  
      firstFrame = image;
      // copy data to src
      ncvAssertReturnNcvStat (CopyData<RgbToMonochrome> (image, src));
  
      IplImage *image2;
      image2 = cvLoadImage (frame1Name);
      if (image2 == 0)
      {
          std::cout << "Could not open '" << frame1Name << "'\n";
          return NCV_FILE_ERROR;
      }
      lastFrame = image2;
  
      ncvAssertReturnNcvStat (CopyData<RgbToMonochrome> (image2, dst));
  
      width  = image->width;
      height = image->height;
  
      return NCV_SUCCESS;
  }
  
  template<typename T>
  inline T Clamp (T x, T a, T b)
  {
      return ((x) > (a) ? ((x) < (b) ? (x) : (b)) : (a));
  }
  
  template<typename T>
  inline T MapValue (T x, T a, T b, T c, T d)
  {
      x = Clamp (x, a, b);
      return c + (d - c) * (x - a) / (b - a);
  }
  
  static NCVStatus ShowFlow (NCVMatrixAlloc<Ncv32f> &u, NCVMatrixAlloc<Ncv32f> &v, const char *name)
  {
      IplImage *flowField;
  
      NCVMatrixAlloc<Ncv32f> host_u(*g_pHostMemAllocator, u.width(), u.height());
      ncvAssertReturn(host_u.isMemAllocated(), NCV_ALLOCATOR_BAD_ALLOC);
  
      NCVMatrixAlloc<Ncv32f> host_v (*g_pHostMemAllocator, u.width (), u.height ());
      ncvAssertReturn (host_v.isMemAllocated (), NCV_ALLOCATOR_BAD_ALLOC);
  
      ncvAssertReturnNcvStat (u.copySolid (host_u, 0));
      ncvAssertReturnNcvStat (v.copySolid (host_v, 0));
  
      float *ptr_u = host_u.ptr ();
      float *ptr_v = host_v.ptr ();
  
      float maxDisplacement = 1.0f;
  
      for (Ncv32u i = 0; i < u.height (); ++i)
      {
          for (Ncv32u j = 0; j < u.width (); ++j)
          {
              float d = std::max ( fabsf(*ptr_u), fabsf(*ptr_v) );
              if (d > maxDisplacement) maxDisplacement = d;
              ++ptr_u;
              ++ptr_v;
          }
          ptr_u += u.stride () - u.width ();
          ptr_v += v.stride () - v.width ();
      }
  
      CvSize image_size = cvSize (u.width (), u.height ());
      flowField = cvCreateImage (image_size, IPL_DEPTH_8U, 4);
      if (flowField == 0) return NCV_NULL_PTR;
  
      unsigned char *row = reinterpret_cast<unsigned char *> (flowField->imageData);
  
      ptr_u = host_u.ptr();
      ptr_v = host_v.ptr();
      for (int i = 0; i < flowField->height; ++i)
      {
          for (int j = 0; j < flowField->width; ++j)
          {
              (row + j * flowField->nChannels)[0] = 0;
              (row + j * flowField->nChannels)[1] = static_cast<unsigned char> (MapValue (-(*ptr_v), -maxDisplacement, maxDisplacement, 0.0f, 255.0f));
              (row + j * flowField->nChannels)[2] = static_cast<unsigned char> (MapValue (*ptr_u   , -maxDisplacement, maxDisplacement, 0.0f, 255.0f));
              (row + j * flowField->nChannels)[3] = 255;
              ++ptr_u;
              ++ptr_v;
          }
          row += flowField->widthStep;
          ptr_u += u.stride () - u.width ();
          ptr_v += v.stride () - v.width ();
      }
  
      cvShowImage (name, flowField);
  
      return NCV_SUCCESS;
  }
  
  static IplImage *CreateImage (NCVMatrixAlloc<Ncv32f> &h_r, NCVMatrixAlloc<Ncv32f> &h_g, NCVMatrixAlloc<Ncv32f> &h_b)
  {
      CvSize imageSize = cvSize (h_r.width (), h_r.height ());
      IplImage *image  = cvCreateImage (imageSize, IPL_DEPTH_8U, 4);
      if (image == 0) return 0;
  
      unsigned char *row = reinterpret_cast<unsigned char*> (image->imageData);
  
      for (int i = 0; i < image->height; ++i)
      {
          for (int j = 0; j < image->width; ++j)
          {
              int offset = j * image->nChannels;
              int pos    = i * h_r.stride () + j;
              row[offset + 0] = static_cast<unsigned char> (h_b.ptr ()[pos] * 255.0f);
              row[offset + 1] = static_cast<unsigned char> (h_g.ptr ()[pos] * 255.0f);
              row[offset + 2] = static_cast<unsigned char> (h_r.ptr ()[pos] * 255.0f);
              row[offset + 3] = 255;
          }
          row += image->widthStep;
      }
      return image;
  }
  
  static void PrintHelp ()
  {
      std::cout << "Usage help:\n";
      std::cout << std::setiosflags(std::ios::left);
      std::cout << "\t" << std::setw(15) << PARAM_ALPHA << " - set alpha\n";
      std::cout << "\t" << std::setw(15) << PARAM_GAMMA << " - set gamma\n";
      std::cout << "\t" << std::setw(15) << PARAM_INNER << " - set number of inner iterations\n";
      std::cout << "\t" << std::setw(15) << PARAM_LEFT << " - specify left image\n";
      std::cout << "\t" << std::setw(15) << PARAM_RIGHT << " - specify right image\n";
      std::cout << "\t" << std::setw(15) << PARAM_OUTER << " - set number of outer iterations\n";
      std::cout << "\t" << std::setw(15) << PARAM_SCALE << " - set pyramid scale factor\n";
      std::cout << "\t" << std::setw(15) << PARAM_SOLVER << " - set number of basic solver iterations\n";
      std::cout << "\t" << std::setw(15) << PARAM_TIME_STEP << " - set frame interpolation time step\n";
      std::cout << "\t" << std::setw(15) << PARAM_HELP << " - display this help message\n";
  }
  
  static int ProcessCommandLine(int argc, char **argv,
                         Ncv32f &timeStep,
                         char *&frame0Name,
                         char *&frame1Name,
                         NCVBroxOpticalFlowDescriptor &desc)
  {
      timeStep = 0.25f;
      for (int iarg = 1; iarg < argc; ++iarg)
      {
          if (strcmp(argv[iarg], PARAM_LEFT) == 0)
          {
              if (iarg + 1 < argc)
              {
                  frame0Name = argv[++iarg];
              }
              else
                  return -1;
          }
          if (strcmp(argv[iarg], PARAM_RIGHT) == 0)
          {
              if (iarg + 1 < argc)
              {
                  frame1Name = argv[++iarg];
              }
              else
                  return -1;
          }
          else if(strcmp(argv[iarg], PARAM_SCALE) == 0)
          {
              if (iarg + 1 < argc)
                  desc.scale_factor = static_cast<Ncv32f>(atof(argv[++iarg]));
              else
                  return -1;
          }
          else if(strcmp(argv[iarg], PARAM_ALPHA) == 0)
          {
              if (iarg + 1 < argc)
                  desc.alpha = static_cast<Ncv32f>(atof(argv[++iarg]));
              else
                  return -1;
          }
          else if(strcmp(argv[iarg], PARAM_GAMMA) == 0)
          {
              if (iarg + 1 < argc)
                  desc.gamma = static_cast<Ncv32f>(atof(argv[++iarg]));
              else
                  return -1;
          }
          else if(strcmp(argv[iarg], PARAM_INNER) == 0)
          {
              if (iarg + 1 < argc)
                  desc.number_of_inner_iterations = static_cast<Ncv32u>(atoi(argv[++iarg]));
              else
                  return -1;
          }
          else if(strcmp(argv[iarg], PARAM_OUTER) == 0)
          {
              if (iarg + 1 < argc)
                  desc.number_of_outer_iterations = static_cast<Ncv32u>(atoi(argv[++iarg]));
              else
                  return -1;
          }
          else if(strcmp(argv[iarg], PARAM_SOLVER) == 0)
          {
              if (iarg + 1 < argc)
                  desc.number_of_solver_iterations = static_cast<Ncv32u>(atoi(argv[++iarg]));
              else
                  return -1;
          }
          else if(strcmp(argv[iarg], PARAM_TIME_STEP) == 0)
          {
              if (iarg + 1 < argc)
                  timeStep = static_cast<Ncv32f>(atof(argv[++iarg]));
              else
                  return -1;
          }
          else if(strcmp(argv[iarg], PARAM_HELP) == 0)
          {
              PrintHelp ();
              return 0;
          }
      }
      return 0;
  }
  
  
  int main(int argc, char **argv)
  {
      char *frame0Name = 0, *frame1Name = 0;
      Ncv32f timeStep = 0.01f;
  
      NCVBroxOpticalFlowDescriptor desc;
  
      desc.alpha = 0.197f;
      desc.gamma = 50.0f;
      desc.number_of_inner_iterations  = 10;
      desc.number_of_outer_iterations  = 77;
      desc.number_of_solver_iterations = 10;
      desc.scale_factor = 0.8f;
  
      int result = ProcessCommandLine (argc, argv, timeStep, frame0Name, frame1Name, desc);
      if (argc == 1 || result)
      {
          PrintHelp();
          return result;
      }
  
      cv::cuda::printShortCudaDeviceInfo(cv::cuda::getDevice());
  
      std::cout << "OpenCV / NVIDIA Computer Vision\n";
      std::cout << "Optical Flow Demo: Frame Interpolation\n";
      std::cout << "=========================================\n";
      std::cout << "Press:\n ESC to quit\n 'a' to move to the previous frame\n 's' to move to the next frame\n";
  
      int devId;
      ncvAssertCUDAReturn(cudaGetDevice(&devId), -1);
      cudaDeviceProp devProp;
      ncvAssertCUDAReturn(cudaGetDeviceProperties(&devProp, devId), -1);
      std::cout << "Using GPU: " << devId << "(" << devProp.name <<
          "), arch=" << devProp.major << "." << devProp.minor << std::endl;
  
      g_pGPUMemAllocator  = Ptr<INCVMemAllocator> (new NCVMemNativeAllocator (NCVMemoryTypeDevice, static_cast<Ncv32u>(devProp.textureAlignment)));
      ncvAssertPrintReturn (g_pGPUMemAllocator->isInitialized (), "Device memory allocator isn't initialized", -1);
  
      g_pHostMemAllocator = Ptr<INCVMemAllocator> (new NCVMemNativeAllocator (NCVMemoryTypeHostPageable, static_cast<Ncv32u>(devProp.textureAlignment)));
      ncvAssertPrintReturn (g_pHostMemAllocator->isInitialized (), "Host memory allocator isn't initialized", -1);
  
      int width, height;
  
      Ptr<NCVMatrixAlloc<Ncv32f> > src_host;
      Ptr<NCVMatrixAlloc<Ncv32f> > dst_host;
  
      IplImage *firstFrame, *lastFrame;
      if (frame0Name != 0 && frame1Name != 0)
      {
          ncvAssertReturnNcvStat (LoadImages (frame0Name, frame1Name, width, height, src_host, dst_host, firstFrame, lastFrame));
      }
      else
      {
          ncvAssertReturnNcvStat (LoadImages ("frame10.bmp", "frame11.bmp", width, height, src_host, dst_host, firstFrame, lastFrame));
      }
  
      Ptr<NCVMatrixAlloc<Ncv32f> > src (new NCVMatrixAlloc<Ncv32f> (*g_pGPUMemAllocator, src_host->width (), src_host->height ()));
      ncvAssertReturn(src->isMemAllocated(), -1);
  
      Ptr<NCVMatrixAlloc<Ncv32f> > dst (new NCVMatrixAlloc<Ncv32f> (*g_pGPUMemAllocator, src_host->width (), src_host->height ()));
      ncvAssertReturn (dst->isMemAllocated (), -1);
  
      ncvAssertReturnNcvStat (src_host->copySolid ( *src, 0 ));
      ncvAssertReturnNcvStat (dst_host->copySolid ( *dst, 0 ));
  
  #if defined SAFE_MAT_DECL
  #undef SAFE_MAT_DECL
  #endif
  #define SAFE_MAT_DECL(name, allocator, sx, sy) \
      NCVMatrixAlloc<Ncv32f> name(*allocator, sx, sy);\
      ncvAssertReturn(name.isMemAllocated(), -1);
  
      SAFE_MAT_DECL (u, g_pGPUMemAllocator, width, height);
      SAFE_MAT_DECL (v, g_pGPUMemAllocator, width, height);
  
      SAFE_MAT_DECL (uBck, g_pGPUMemAllocator, width, height);
      SAFE_MAT_DECL (vBck, g_pGPUMemAllocator, width, height);
  
      SAFE_MAT_DECL (h_r, g_pHostMemAllocator, width, height);
      SAFE_MAT_DECL (h_g, g_pHostMemAllocator, width, height);
      SAFE_MAT_DECL (h_b, g_pHostMemAllocator, width, height);
  
      std::cout << "Estimating optical flow\nForward...\n";
  
      if (NCV_SUCCESS != NCVBroxOpticalFlow (desc, *g_pGPUMemAllocator, *src, *dst, u, v, 0))
      {
          std::cout << "Failed\n";
          return -1;
      }
  
      std::cout << "Backward...\n";
      if (NCV_SUCCESS != NCVBroxOpticalFlow (desc, *g_pGPUMemAllocator, *dst, *src, uBck, vBck, 0))
      {
          std::cout << "Failed\n";
          return -1;
      }
  
      // matrix for temporary data
      SAFE_MAT_DECL (d_temp, g_pGPUMemAllocator, width, height);
  
      // first frame color components (GPU memory)
      SAFE_MAT_DECL (d_r, g_pGPUMemAllocator, width, height);
      SAFE_MAT_DECL (d_g, g_pGPUMemAllocator, width, height);
      SAFE_MAT_DECL (d_b, g_pGPUMemAllocator, width, height);
  
      // second frame color components (GPU memory)
      SAFE_MAT_DECL (d_rt, g_pGPUMemAllocator, width, height);
      SAFE_MAT_DECL (d_gt, g_pGPUMemAllocator, width, height);
      SAFE_MAT_DECL (d_bt, g_pGPUMemAllocator, width, height);
  
      // intermediate frame color components (GPU memory)
      SAFE_MAT_DECL (d_rNew, g_pGPUMemAllocator, width, height);
      SAFE_MAT_DECL (d_gNew, g_pGPUMemAllocator, width, height);
      SAFE_MAT_DECL (d_bNew, g_pGPUMemAllocator, width, height);
  
      // interpolated forward flow
      SAFE_MAT_DECL (ui, g_pGPUMemAllocator, width, height);
      SAFE_MAT_DECL (vi, g_pGPUMemAllocator, width, height);
  
      // interpolated backward flow
      SAFE_MAT_DECL (ubi, g_pGPUMemAllocator, width, height);
      SAFE_MAT_DECL (vbi, g_pGPUMemAllocator, width, height);
  
      // occlusion masks
      SAFE_MAT_DECL (occ0, g_pGPUMemAllocator, width, height);
      SAFE_MAT_DECL (occ1, g_pGPUMemAllocator, width, height);
  
      // prepare color components on host and copy them to device memory
      ncvAssertReturnNcvStat (CopyData<RgbToR> (firstFrame, h_r));
      ncvAssertReturnNcvStat (CopyData<RgbToG> (firstFrame, h_g));
      ncvAssertReturnNcvStat (CopyData<RgbToB> (firstFrame, h_b));
  
      ncvAssertReturnNcvStat (h_r.copySolid ( d_r, 0 ));
      ncvAssertReturnNcvStat (h_g.copySolid ( d_g, 0 ));
      ncvAssertReturnNcvStat (h_b.copySolid ( d_b, 0 ));
  
      ncvAssertReturnNcvStat (CopyData<RgbToR> (lastFrame, h_r));
      ncvAssertReturnNcvStat (CopyData<RgbToG> (lastFrame, h_g));
      ncvAssertReturnNcvStat (CopyData<RgbToB> (lastFrame, h_b));
  
      ncvAssertReturnNcvStat (h_r.copySolid ( d_rt, 0 ));
      ncvAssertReturnNcvStat (h_g.copySolid ( d_gt, 0 ));
      ncvAssertReturnNcvStat (h_b.copySolid ( d_bt, 0 ));
  
      std::cout << "Interpolating...\n";
      std::cout.precision (4);
  
      std::vector<IplImage*> frames;
      frames.push_back (firstFrame);
  
      // compute interpolated frames
      for (Ncv32f timePos = timeStep; timePos < 1.0f; timePos += timeStep)
      {
          ncvAssertCUDAReturn (cudaMemset (ui.ptr (), 0, ui.pitch () * ui.height ()), NCV_CUDA_ERROR);
          ncvAssertCUDAReturn (cudaMemset (vi.ptr (), 0, vi.pitch () * vi.height ()), NCV_CUDA_ERROR);
  
          ncvAssertCUDAReturn (cudaMemset (ubi.ptr (), 0, ubi.pitch () * ubi.height ()), NCV_CUDA_ERROR);
          ncvAssertCUDAReturn (cudaMemset (vbi.ptr (), 0, vbi.pitch () * vbi.height ()), NCV_CUDA_ERROR);
  
          ncvAssertCUDAReturn (cudaMemset (occ0.ptr (), 0, occ0.pitch () * occ0.height ()), NCV_CUDA_ERROR);
          ncvAssertCUDAReturn (cudaMemset (occ1.ptr (), 0, occ1.pitch () * occ1.height ()), NCV_CUDA_ERROR);
  
          NppStInterpolationState state;
          // interpolation state should be filled once except pSrcFrame0, pSrcFrame1, and pNewFrame
          // we will only need to reset buffers content to 0 since interpolator doesn't do this itself
          state.size  = NcvSize32u (width, height);
          state.nStep = d_r.pitch ();
          state.pSrcFrame0 = d_r.ptr ();
          state.pSrcFrame1 = d_rt.ptr ();
          state.pFU = u.ptr ();
          state.pFV = v.ptr ();
          state.pBU = uBck.ptr ();
          state.pBV = vBck.ptr ();
          state.pos = timePos;
          state.pNewFrame = d_rNew.ptr ();
          state.ppBuffers[0] = occ0.ptr ();
          state.ppBuffers[1] = occ1.ptr ();
          state.ppBuffers[2] = ui.ptr ();
          state.ppBuffers[3] = vi.ptr ();
          state.ppBuffers[4] = ubi.ptr ();
          state.ppBuffers[5] = vbi.ptr ();
  
          // interpolate red channel
          nppiStInterpolateFrames (&state);
  
          // reset buffers
          ncvAssertCUDAReturn (cudaMemset (ui.ptr (), 0, ui.pitch () * ui.height ()), NCV_CUDA_ERROR);
          ncvAssertCUDAReturn (cudaMemset (vi.ptr (), 0, vi.pitch () * vi.height ()), NCV_CUDA_ERROR);
  
          ncvAssertCUDAReturn (cudaMemset (ubi.ptr (), 0, ubi.pitch () * ubi.height ()), NCV_CUDA_ERROR);
          ncvAssertCUDAReturn (cudaMemset (vbi.ptr (), 0, vbi.pitch () * vbi.height ()), NCV_CUDA_ERROR);
  
          ncvAssertCUDAReturn (cudaMemset (occ0.ptr (), 0, occ0.pitch () * occ0.height ()), NCV_CUDA_ERROR);
          ncvAssertCUDAReturn (cudaMemset (occ1.ptr (), 0, occ1.pitch () * occ1.height ()), NCV_CUDA_ERROR);
  
          // interpolate green channel
          state.pSrcFrame0 = d_g.ptr ();
          state.pSrcFrame1 = d_gt.ptr ();
          state.pNewFrame  = d_gNew.ptr ();
  
          nppiStInterpolateFrames (&state);
  
          // reset buffers
          ncvAssertCUDAReturn (cudaMemset (ui.ptr (), 0, ui.pitch () * ui.height ()), NCV_CUDA_ERROR);
          ncvAssertCUDAReturn (cudaMemset (vi.ptr (), 0, vi.pitch () * vi.height ()), NCV_CUDA_ERROR);
  
          ncvAssertCUDAReturn (cudaMemset (ubi.ptr (), 0, ubi.pitch () * ubi.height ()), NCV_CUDA_ERROR);
          ncvAssertCUDAReturn (cudaMemset (vbi.ptr (), 0, vbi.pitch () * vbi.height ()), NCV_CUDA_ERROR);
  
          ncvAssertCUDAReturn (cudaMemset (occ0.ptr (), 0, occ0.pitch () * occ0.height ()), NCV_CUDA_ERROR);
          ncvAssertCUDAReturn (cudaMemset (occ1.ptr (), 0, occ1.pitch () * occ1.height ()), NCV_CUDA_ERROR);
  
          // interpolate blue channel
          state.pSrcFrame0 = d_b.ptr ();
          state.pSrcFrame1 = d_bt.ptr ();
          state.pNewFrame  = d_bNew.ptr ();
  
          nppiStInterpolateFrames (&state);
  
          // copy to host memory
          ncvAssertReturnNcvStat (d_rNew.copySolid (h_r, 0));
          ncvAssertReturnNcvStat (d_gNew.copySolid (h_g, 0));
          ncvAssertReturnNcvStat (d_bNew.copySolid (h_b, 0));
  
          // convert to IplImage
          IplImage *newFrame = CreateImage (h_r, h_g, h_b);
          if (newFrame == 0)
          {
              std::cout << "Could not create new frame in host memory\n";
              break;
          }
          frames.push_back (newFrame);
          std::cout << timePos * 100.0f << "%\r";
      }
      std::cout << std::setw (5) << "100%\n";
  
      frames.push_back (lastFrame);
  
      Ncv32u currentFrame;
      currentFrame = 0;
  
      ShowFlow (u, v, "Forward flow");
      ShowFlow (uBck, vBck, "Backward flow");
  
      cvShowImage ("Interpolated frame", frames[currentFrame]);
  
      bool qPressed = false;
      while ( !qPressed )
      {
          int key = toupper (cvWaitKey (10));
          switch (key)
          {
          case 27:
              qPressed = true;
              break;
          case 'A':
              if (currentFrame > 0) --currentFrame;
              cvShowImage ("Interpolated frame", frames[currentFrame]);
              break;
          case 'S':
              if (currentFrame < frames.size()-1) ++currentFrame;
              cvShowImage ("Interpolated frame", frames[currentFrame]);
              break;
          }
      }
  
      cvDestroyAllWindows ();
  
      std::vector<IplImage*>::iterator iter;
      for (iter = frames.begin (); iter != frames.end (); ++iter)
      {
          cvReleaseImage (&(*iter));
      }
  
      return 0;
  }
  
  #endif
  