calcOpticalFlowFarneback.cpp

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#include "mexopencv.hpp"
#include "opencv2/video.hpp"
using namespace std;
using namespace cv;

void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
    // Check the number of arguments
    nargchk(nrhs>=2 && (nrhs%2)==0 && nlhs<=1);

    // Argument vector
    vector<MxArray> rhs(prhs, prhs+nrhs);

    // Option processing
    Mat flow;
    double pyrScale = 0.5;
    int levels = 5;
    int winsize = 13;
    int iterations = 10;
    int polyN = 5;
    double polySigma = 1.1;
    int flags = 0;
    for (int i=2; i<nrhs; i+=2) {
        string key(rhs[i].toString());
        if (key == "InitialFlow") {
            flow = rhs[i+1].toMat(CV_32F);
            flags |= cv::OPTFLOW_USE_INITIAL_FLOW;
        }
        else if (key == "PyrScale")
            pyrScale = rhs[i+1].toDouble();
        else if (key == "Levels")
            levels = rhs[i+1].toInt();
        else if (key == "WinSize")
            winsize = rhs[i+1].toInt();
        else if (key == "Iterations")
            iterations = rhs[i+1].toInt();
        else if (key == "PolyN")
            polyN = rhs[i+1].toInt();
        else if (key == "PolySigma")
            polySigma = rhs[i+1].toDouble();
        else if (key == "Gaussian")
            UPDATE_FLAG(flags, rhs[i+1].toBool(), cv::OPTFLOW_FARNEBACK_GAUSSIAN);
        else
            mexErrMsgIdAndTxt("mexopencv:error",
                "Unrecognized option %s", key.c_str());
    }

    // Process
    Mat prevImg(rhs[0].toMat(CV_8U)),
        nextImg(rhs[1].toMat(CV_8U));
    calcOpticalFlowFarneback(prevImg, nextImg, flow, pyrScale, levels,
        winsize, iterations, polyN, polySigma, flags);
    plhs[0] = MxArray(flow);
}