extern CascadeClassifier face_cascade;
extern CascadeClassifier eyes_cascade;
extern CascadeClassifier nose_cascade;
extern CascadeClassifier mouth_cascade;

void faceDetection(){
	Mat src, dst;

	String face_cascade_name = "haarcascade_frontalface_alt.xml";
	String eyes_cascade_name = "haarcascade_eye_tree_eyeglasses.xml";
	if (!face_cascade.load(face_cascade_name))
	{
		printf("Error loading face cascades !\n");
		return;

	}
	if (!eyes_cascade.load(eyes_cascade_name))
	{
		printf("Error loading eyes cascades !\n");
		return;
	}
	char fname[MAX_PATH];
	while (openFileDlg(fname)){
		src = imread(fname, CV_LOAD_IMAGE_COLOR);
		dst = src.clone();
		int minFaceSize = 30;
		int minEyeSize = minFaceSize / 5;

		FaceDetectandDisplay("dst", dst, minFaceSize, minEyeSize);
		waitKey(0);

	}
}

void faceDetectionAll(){
	Mat src, dst;
	vector<Rect> faces;

	String face_cascade_name = "lbpcascade_frontalface.xml";
	String eyes_cascade_name = "haarcascade_eye_tree_eyeglasses.xml";
	String nose_cascade_name = "haarcascade_mcs_nose.xml";
	String mouth_cascade_name = "haarcascade_mcs_mouth.xml";
	// Load the cascades
	if (!face_cascade.load(face_cascade_name))
	{
		printf("Error loading face cascades !\n");
		return;
	}
	if (!eyes_cascade.load(eyes_cascade_name))
	{
		printf("Error loading eyes cascades !\n");
		return;
	}
	if (!nose_cascade.load(nose_cascade_name))
	{
		printf("Error loading nose cascades !\n");
		return;
	}
	if (!mouth_cascade.load(mouth_cascade_name))
	{
		printf("Error loading mouth cascades !\n");
		return;
	}
	char fname[MAX_PATH];
	while (openFileDlg(fname)){
		src = imread(fname, CV_LOAD_IMAGE_COLOR);
		dst = src.clone();
		int minFaceSize = 30;
		int minEyeSize = minFaceSize / 5;

		FaceDetectandDisplayAll("Dst", dst, minFaceSize, minEyeSize, faces);
		waitKey(0);

	}
}

void faceDetectionVideo(){
	VideoCapture cap(0);
	if (!cap.isOpened())
		return;

	String face_cascade_name = "haarcascade_frontalface_alt.xml";

	if (!face_cascade.load(face_cascade_name))
	{
		printf("Error loading face cascades !\n");
		return;
	}

	Mat  frame_gray;
	namedWindow("camera", 1);
	for (;;)
	{
		std::vector<Rect> faces;
		Mat frame;
		cap >> frame;
		cvtColor(frame, frame_gray, CV_BGR2GRAY);

		equalizeHist(frame_gray, frame_gray);
		int minFaceSize = 30;
		int minEyeSize = minFaceSize / 5;
		face_cascade.detectMultiScale(frame_gray, faces, 1.1, 2, 0 | CV_HAAR_SCALE_IMAGE,
			Size(minFaceSize, minFaceSize));

		for (int i = 0; i < faces.size(); i++)
		{

			Point center(faces[i].x + faces[i].width*0.5, faces[i].y + faces[i].height*0.5);
			Point upLeft(faces[i].x, faces[i].y);
			Point downRight(faces[i].x + faces[i].height, faces[i].y + faces[i].width);

			rectangle(frame, upLeft, downRight, Scalar(255, 0, 255), 2, 8, 0);


		}

		imshow("camera", frame);
		if (waitKey(30) >= 0)
			break;
	}
}