getStructuringElement.cpp

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

namespace {
const ConstMap<string,int> MorphShape = ConstMap<string,int>
    ("Rect",    cv::MORPH_RECT)
    ("Cross",   cv::MORPH_CROSS)
    ("Ellipse", cv::MORPH_ELLIPSE);
}

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

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

    // Option processing
    int shape = cv::MORPH_RECT;
    Size ksize(3,3);
    Point anchor(-1,-1);
    for (int i=0; i<nrhs; i+=2) {
        string key(rhs[i].toString());
        if (key == "Shape")
            shape = MorphShape[rhs[i+1].toString()];
        else if (key == "KSize")
            ksize = rhs[i+1].toSize();
        else if (key == "Anchor")
            anchor = rhs[i+1].toPoint();
        else
            mexErrMsgIdAndTxt("mexopencv:error",
                "Unrecognized option %s", key.c_str());
    }

    // Process
    Mat elem = getStructuringElement(shape, ksize, anchor);
    plhs[0] = MxArray(elem);
}