warpPerspective.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 dst;
    Size dsize;
    int flags = cv::INTER_LINEAR;
    bool warp_inverse = false;
    int borderMode = cv::BORDER_CONSTANT;
    Scalar borderValue;
    for (int i=2; i<nrhs; i+=2) {
        string key(rhs[i].toString());
        if (key=="Dst")
            dst = rhs[i+1].toMat();
        else if (key=="DSize")
            dsize = rhs[i+1].toSize();
        else if (key=="Interpolation")
            flags = InterpType[rhs[i+1].toString()];
        else if (key=="WarpInverse")
            warp_inverse = rhs[i+1].toBool();
        else if (key=="BorderType")
            borderMode = BorderType[rhs[i+1].toString()];
        else if (key=="BorderValue")
            borderValue = rhs[i+1].toScalar();
        else
            mexErrMsgIdAndTxt("mexopencv:error","Unrecognized option");
    }
    flags |= (warp_inverse ? cv::WARP_INVERSE_MAP : 0);
    if (!dst.empty())
        dsize = dst.size();

    // Process
    Mat src(rhs[0].toMat()),
        M(rhs[1].toMat(CV_64F));
    warpPerspective(src, dst, M, dsize, flags, borderMode, borderValue);
    plhs[0] = MxArray(dst);
}