Edge Smoothing and filling inner contours in opencv with iOS

Question

I am trying to tan human skin with different intensity with help of opencv. I have already identified human skin and changing color tone of those pixels. But it is not smooth. <

Answer 1

how about?

morphologyEx(grey,grey,MORPH_CLOSE,getStructuringElement( MORPH_ELLIPSE,Size(7,7)));

although the silhouette gets merged for the left hand

edit:slightly more involved

Mat tmp=grey.clone();
morphologyEx(tmp,tmp,MORPH_GRADIENT,getStructuringElement(MORPH_ELLIPSE,Size(3,3)));
bitwise_not(tmp,tmp);
Mat smallholes=Mat::zeros(tmp.size(), CV_8UC1);
vector<vector<Point>> contours;
findContours(tmp,contours,CV_RETR_LIST,CV_CHAIN_APPROX_SIMPLE);
for(int i = 0; i < contours.size(); i++)
{       
    double area = contourArea(Mat(contours[i]));
    if(area<100)
        drawContours(smallholes, contours, i, 255, -1);
}
Mat done;
bitwise_or(grey,smallholes,done);
morphologyEx(done,done,MORPH_CLOSE,getStructuringElement(MORPH_ELLIPSE,Size(3,3)));