Canny.cpp

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#include "mexopencv.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
    int apertureSize = 3;
    bool L2gradient = false;
    for (int i=2; i<nrhs; i+=2) {
        string key(rhs[i].toString());
        if (key=="ApertureSize")
            apertureSize = rhs[i+1].toInt();
        else if (key=="L2Gradient")
            L2gradient = rhs[i+1].toBool();
        else
            mexErrMsgIdAndTxt("mexopencv:error","Unrecognized option");
    }

    // Second argument
    double threshold1 = 0, threshold2 = 0;
    if (rhs[1].numel()==1) {
        threshold2 = rhs[1].toDouble();
        threshold1 = 0.4 * threshold2;
    }
    else if (rhs[1].numel()==2) {
        Scalar s(rhs[1].toScalar());
        threshold1 = s[0];
        threshold2 = s[1];
    }
    else
        mexErrMsgIdAndTxt("mexopencv:error","Invalid argument");

    // Process
    Mat image(rhs[0].toMat(CV_8U)), edges;
    Canny(image, edges, threshold1, threshold2, apertureSize, L2gradient);
    plhs[0] = MxArray(edges);
}