colorChange.cpp

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#include "mexopencv.hpp"
#include "opencv2/photo.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
    float red_mul = 1.0f;
    float green_mul = 1.0f;
    float blue_mul = 1.0f;
    bool flip = false;
    for (int i=2; i<nrhs; i+=2) {
        string key(rhs[i].toString());
        if (key == "R")
            red_mul = rhs[i+1].toFloat();
        else if (key == "G")
            green_mul = rhs[i+1].toFloat();
        else if (key == "B")
            blue_mul = rhs[i+1].toFloat();
        else if (key == "FlipChannels")
            flip = rhs[i+1].toBool();
        else
            mexErrMsgIdAndTxt("mexopencv:error",
                "Unrecognized option %s", key.c_str());
    }

    // Process
    Mat src(rhs[0].toMat(CV_8U)),
        mask(rhs[1].toMat(CV_8U)),
        dst;
    // MATLAB's default is RGB while OpenCV's is BGR
    if (flip) {
        if (src.channels() == 3)
            cvtColor(src, src, cv::COLOR_RGB2BGR);
        if (mask.channels() == 3)
            cvtColor(mask, mask, cv::COLOR_RGB2BGR);
    }
    colorChange(src, mask, dst, red_mul, green_mul, blue_mul);
    // OpenCV's default is BGR while MATLAB's is RGB
    if (flip && dst.channels() == 3)
        cvtColor(dst, dst, cv::COLOR_BGR2RGB);
    plhs[0] = MxArray(dst);
}