HoughLinesP.cpp

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#include "mexopencv.hpp"
#include "opencv2/imgproc.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>=1 && (nrhs%2)==1 && nlhs<=1);

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

    // Option processing
    double rho = 1;
    double theta = CV_PI/180;
    int threshold = 80;
    double minLineLength = 0;
    double maxLineGap = 0;
    for (int i=1; i<nrhs; i+=2) {
        string key(rhs[i].toString());
        if (key == "Rho")
            rho = rhs[i+1].toDouble();
        else if (key == "Theta")
            theta = rhs[i+1].toDouble();
        else if (key == "Threshold")
            threshold = rhs[i+1].toInt();
        else if (key == "MinLineLength")
            minLineLength = rhs[i+1].toDouble();
        else if (key == "MaxLineGap")
            maxLineGap = rhs[i+1].toDouble();
        else
            mexErrMsgIdAndTxt("mexopencv:error",
                "Unrecognized option %s", key.c_str());
    }

    // Process
    Mat image(rhs[0].toMat(CV_8U));
    vector<Vec4i> lines;
    HoughLinesP(image, lines, rho, theta, threshold, minLineLength, maxLineGap);
    plhs[0] = MxArray(lines);
}