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////////////////////////////////////////////////////////////////////////////////
//
// NVIDIA CUDA implementation of Brox et al Optical Flow algorithm
//
// Algorithm is explained in the original paper:
// T. Brox, A. Bruhn, N. Papenberg, J. Weickert:
// High accuracy optical flow estimation based on a theory for warping.
// ECCV 2004.
//
// Implementation by Mikhail Smirnov
// email: msmirnov@nvidia.com, devsupport@nvidia.com
//
// Credits for help with the code to:
// Alexey Mendelenko, Anton Obukhov, and Alexander Kharlamov.
//
////////////////////////////////////////////////////////////////////////////////
#ifndef _ncv_optical_flow_h_
#define _ncv_optical_flow_h_
#include "opencv2/cudalegacy/NCV.hpp"
//! @addtogroup cudalegacy
//! @{
/// \brief Model and solver parameters
struct NCVBroxOpticalFlowDescriptor
{
/// flow smoothness
Ncv32f alpha;
/// gradient constancy importance
Ncv32f gamma;
/// pyramid scale factor
Ncv32f scale_factor;
/// number of lagged non-linearity iterations (inner loop)
Ncv32u number_of_inner_iterations;
/// number of warping iterations (number of pyramid levels)
Ncv32u number_of_outer_iterations;
/// number of linear system solver iterations
Ncv32u number_of_solver_iterations;
};
/////////////////////////////////////////////////////////////////////////////////////////
/// \brief Compute optical flow
///
/// Based on method by Brox et al [2004]
/// \param [in] desc model and solver parameters
/// \param [in] gpu_mem_allocator GPU memory allocator
/// \param [in] frame0 source frame
/// \param [in] frame1 frame to track
/// \param [out] u flow horizontal component (along \b x axis)
/// \param [out] v flow vertical component (along \b y axis)
/// \param stream
/// \return computation status
/////////////////////////////////////////////////////////////////////////////////////////
CV_EXPORTS
NCVStatus NCVBroxOpticalFlow(const NCVBroxOpticalFlowDescriptor desc,
INCVMemAllocator &gpu_mem_allocator,
const NCVMatrix<Ncv32f> &frame0,
const NCVMatrix<Ncv32f> &frame1,
NCVMatrix<Ncv32f> &u,
NCVMatrix<Ncv32f> &v,
cudaStream_t stream);
//! @}
#endif