Simple hand segmentation from the webcam streaming.

opencv_skin_segmentation.cpp

#include <opencv2\opencv.hpp>

using namespace cv;
using std::cout;

/*--------------- SKIN SEGMENTATION ---------------*/
int main () {
  VideoCapture cap(0);

	if(!cap.isOpened())
		cout << "Error opening VideoCapture"; return -1;
	
	Mat3b frame;
	while(cap.read(frame)){

		/* THRESHOLD ON HSV*/
		cvtColor(frame, frame, CV_BGR2HSV);
		GaussianBlur(frame, frame, Size(7,7), 1, 1);
		for(int r=0; r<frame.rows; ++r){
			for(int c=0; c<frame.cols; ++c) 
				// 0<H<0.25  -   0.15<S<0.9    -    0.2<V<0.95   
				if( (frame(r,c)[0]>5) && (frame(r,c)[0] < 17) && (frame(r,c)[1]>38) && (frame(r,c)[1]<250) && (frame(r,c)[2]>51) && (frame(r,c)[2]<242) ); // do nothing
				else for(int i=0; i<3; ++i)	frame(r,c)[i] = 0;
		}

		/* BGR CONVERSION AND THRESHOLD */
		Mat1b frame_gray;
		cvtColor(frame, frame, CV_HSV2BGR);
		cvtColor(frame, frame_gray, CV_BGR2GRAY);
		threshold(frame_gray, frame_gray, 60, 255, CV_THRESH_BINARY);
		morphologyEx(frame_gray, frame_gray, CV_MOP_ERODE, Mat1b(3,3,1), Point(-1, -1), 3);
		morphologyEx(frame_gray, frame_gray, CV_MOP_OPEN, Mat1b(7,7,1), Point(-1, -1), 1);
		morphologyEx(frame_gray, frame_gray, CV_MOP_CLOSE, Mat1b(9,9,1), Point(-1, -1), 1);

		medianBlur(frame_gray, frame_gray, 15);
    imshow("Threshold", frame_gray);

		cvtColor(frame, frame, CV_BGR2HSV);
		resize(frame, frame, Size(), 0.5, 0.5);
		imshow("Video",frame);

		waitKey(5);
	}
}