env/opencv-4.8.0/modules/video/test/ocl/test_optflow_farneback.cpp

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#include "../test_precomp.hpp"
#include "opencv2/ts/ocl_test.hpp"

#ifdef HAVE_OPENCL

namespace opencv_test {
namespace ocl {

/////////////////////////////////////////////////////////////////////////////////////////////////
// FarnebackOpticalFlow
namespace
{
    IMPLEMENT_PARAM_CLASS(PyrScale, double)
    IMPLEMENT_PARAM_CLASS(PolyN, int)
    CV_FLAGS(FarnebackOptFlowFlags, 0, OPTFLOW_FARNEBACK_GAUSSIAN)
    IMPLEMENT_PARAM_CLASS(UseInitFlow, bool)
}

PARAM_TEST_CASE(FarnebackOpticalFlow, PyrScale, PolyN, FarnebackOptFlowFlags, UseInitFlow)
{
    int numLevels;
    int winSize;
    int numIters;
    double pyrScale;
    int polyN;
    int flags;
    bool useInitFlow;

    virtual void SetUp()
    {
        numLevels = 5;
        winSize = 13;
        numIters = 10;
        pyrScale = GET_PARAM(0);
        polyN = GET_PARAM(1);
        flags = GET_PARAM(2);
        useInitFlow = GET_PARAM(3);
    }
};

OCL_TEST_P(FarnebackOpticalFlow, Mat)
{
    cv::Mat frame0 = readImage("optflow/RubberWhale1.png", cv::IMREAD_GRAYSCALE);
    ASSERT_FALSE(frame0.empty());

    cv::Mat frame1 = readImage("optflow/RubberWhale2.png", cv::IMREAD_GRAYSCALE);
    ASSERT_FALSE(frame1.empty());

    double polySigma = polyN <= 5 ? 1.1 : 1.5;

    cv::Mat flow; cv::UMat uflow;
    if (useInitFlow)
    {
        OCL_ON(cv::calcOpticalFlowFarneback(frame0, frame1, uflow, pyrScale, numLevels, winSize, numIters, polyN, polySigma, flags));
        uflow.copyTo(flow);
        flags |= cv::OPTFLOW_USE_INITIAL_FLOW;
    }
    OCL_OFF(cv::calcOpticalFlowFarneback(frame0, frame1, flow, pyrScale, numLevels, winSize, numIters, polyN, polySigma, flags));
    OCL_ON(cv::calcOpticalFlowFarneback(frame0, frame1, uflow, pyrScale, numLevels, winSize, numIters, polyN, polySigma, flags));

    EXPECT_MAT_SIMILAR(flow, uflow, 0.1);
}


OCL_INSTANTIATE_TEST_CASE_P(Video, FarnebackOpticalFlow,
                            Combine(
                                Values(PyrScale(0.3), PyrScale(0.5), PyrScale(0.8)),
                                Values(PolyN(5), PolyN(7)),
                                Values(FarnebackOptFlowFlags(0), FarnebackOptFlowFlags(cv::OPTFLOW_FARNEBACK_GAUSSIAN)),
                                Values(UseInitFlow(false), UseInitFlow(true))
                                )
                           );


} } // namespace opencv_test::ocl

#endif // HAVE_OPENCL