drawMatches.cpp

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#include "mexopencv.hpp"
#include "opencv2/features2d.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>=5 && (nrhs%2)==1 && nlhs<=1);

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

    // Option processing
    Mat outImg;
    Scalar matchColor(Scalar::all(-1));
    Scalar singlePointColor(Scalar::all(-1));
    vector<char> matchesMask;
    int flags = DrawMatchesFlags::DEFAULT;
    for (int i=5; i<nrhs; i+=2) {
        string key(rhs[i].toString());
        if (key == "MatchColor")
            matchColor = (rhs[i+1].isChar()) ?
                ColorType[rhs[i+1].toString()] : rhs[i+1].toScalar();
        else if (key == "SinglePointColor")
            singlePointColor = (rhs[i+1].isChar()) ?
                ColorType[rhs[i+1].toString()] : rhs[i+1].toScalar();
        else if (key == "MatchesMask")
            rhs[i+1].toMat(CV_8S).reshape(1,1).copyTo(matchesMask);
        else if (key == "NotDrawSinglePoints")
            UPDATE_FLAG(flags, rhs[i+1].toBool(),
                DrawMatchesFlags::NOT_DRAW_SINGLE_POINTS);
        else if (key == "DrawRichKeypoints")
            UPDATE_FLAG(flags, rhs[i+1].toBool(),
                DrawMatchesFlags::DRAW_RICH_KEYPOINTS);
        else if (key == "OutImage") {
            outImg = rhs[i+1].toMat(CV_8U);
            flags |= DrawMatchesFlags::DRAW_OVER_OUTIMG;
        }
        else
            mexErrMsgIdAndTxt("mexopencv:error",
                "Unrecognized option %s", key.c_str());
    }

    // Process
    Mat img1(rhs[0].toMat(CV_8U)),
        img2(rhs[2].toMat(CV_8U));
    vector<KeyPoint> keypoints1(rhs[1].toVector<KeyPoint>()),
                     keypoints2(rhs[3].toVector<KeyPoint>());
    vector<DMatch> matches1to2(rhs[4].toVector<DMatch>());
    drawMatches(img1, keypoints1, img2, keypoints2, matches1to2, outImg,
        matchColor, singlePointColor, matchesMask, flags);
    plhs[0] = MxArray(outImg);
}