thinning.cpp

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

namespace {
const ConstMap<string,int> ThinningTypesMap = ConstMap<string,int>
    ("ZhangSuen", cv::ximgproc::THINNING_ZHANGSUEN)
    ("GuoHall",   cv::ximgproc::THINNING_GUOHALL);
}

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
    int thinningType = cv::ximgproc::THINNING_ZHANGSUEN;
    for (int i=1; i<nrhs; i+=2) {
        string key(rhs[i].toString());
        if (key == "ThinningType")
            thinningType = ThinningTypesMap[rhs[i+1].toString()];
        else
            mexErrMsgIdAndTxt("mexopencv:error",
                "Unrecognized option %s", key.c_str());
    }

    // Process
    Mat src(rhs[0].toMat(CV_8U)), dst;
    thinning(src, dst, thinningType);
    plhs[0] = MxArray(dst);
}