subtract.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
    Mat mask, dst;
    int dtype = -1;
    for (int i=2; i<nrhs; i+=2) {
        string key(rhs[i].toString());
        if (key == "Mask")
            mask = rhs[i+1].toMat(CV_8U);
        else if (key == "Dest")
            dst = rhs[i+1].toMat();
        else if (key == "DType")
            dtype = (rhs[i+1].isChar()) ?
                ClassNameMap[rhs[i+1].toString()] : rhs[i+1].toInt();
        else
            mexErrMsgIdAndTxt("mexopencv:error",
                "Unrecognized option %s", key.c_str());
    }

    // Process
    Mat src1(rhs[0].toMat()),
        src2(rhs[1].toMat());
    subtract(src1, src2, dst, mask, dtype);
    plhs[0] = MxArray(dst);
}