edgePreservingFilter.cpp

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

namespace {
const ConstMap<string,int> EdgePreseveFilterMap = ConstMap<string,int>
    ("Recursive", cv::RECURS_FILTER)
    ("NormConv",  cv::NORMCONV_FILTER);
}

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 flags = cv::RECURS_FILTER;
    float sigma_s = 60;
    float sigma_r = 0.04f;
    bool flip = false;
    for (int i=1; i<nrhs; i+=2) {
        string key(rhs[i].toString());
        if (key == "Filter")
            flags = EdgePreseveFilterMap[rhs[i+1].toString()];
        else if (key == "SigmaS")
            sigma_s = rhs[i+1].toFloat();
        else if (key == "SigmaR")
            sigma_r = 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)), dst;
    if (flip && src.channels() == 3) {
        // MATLAB's default is RGB while OpenCV's is BGR
        cvtColor(src, src, cv::COLOR_RGB2BGR);
    }
    edgePreservingFilter(src, dst, flags, sigma_s, sigma_r);
    if (flip && dst.channels() == 3) {
        // OpenCV's default is BGR while MATLAB's is RGB
        cvtColor(dst, dst, cv::COLOR_BGR2RGB);
    }
    plhs[0] = MxArray(dst);
}