Point detectFace(Mat frame, Point priorCenter) {

	std::vector<Rect> faces;
	Mat frame_gray, frame_lab, output, temp;
	int h = frame.size().height - 1;
	int w = frame.size().width - 1;
	int minNeighbors = 2;
	bool faceNotFound = false;

	//CascadeClassifier eyeCascade1;
	//CascadeClassifier eyeCascade2;




	cvtColor(frame, frame_gray, COLOR_BGR2GRAY);   // Convert to gray
	equalizeHist(frame_gray, frame_gray);          // Equalize histogram

	// Detect face with open source cascade
	face_cascade.detectMultiScale(frame_gray, faces,
		1.1, minNeighbors,
		0 | CASCADE_SCALE_IMAGE, Size(30, 30));

	// iterate over faces
	for (size_t i = 0; i < faces.size(); i++) {

		// Find center of face
		Point center(faces[i].x + faces[i].width / 2,
			faces[i].y + faces[i].height / 2);

		// Generate width and height of face, round to closest 1/4 of frame height
		h = roundUp(faces[i].height, frame.size().height / 4);
		w = 3 * h / 5;

		// If priorCenter not yet initialized, initialize
		if (priorCenter.x == 0) {
			priorCenter = center;
			temp = outputFrame(frame, center, w, h);
			break;
		}

		// Check to see if it's probably the same user
		if (abs(center.x - priorCenter.x) < frame.size().width / 6 &&
			abs(center.y - priorCenter.y) < frame.size().height / 6) {

			// Check to see if the user moved enough to update position
			if (abs(center.x - priorCenter.x) < 7 &&
				abs(center.y - priorCenter.y) < 7){
				center = priorCenter;
			}

			// Smooth new center compared to old center
			center.x = (center.x + 2 * priorCenter.x) / 3;
			center.y = (center.y + 2 * priorCenter.y) / 3;
			priorCenter = center;

			// output frame of only face
			temp = outputFrame(frame, center, w, h);

			break; // exit, primary users face probably found

		}
		else {
			faceNotFound = true;
		}
	}

	if (faceNotFound)
	{

		// Findface from eyes
		Rect r(priorCenter.x, priorCenter.y, w, h);
		if (priorCenter.x + w > frame_gray.size().width - 2 &&
			priorCenter.y + h > frame_gray.size().height - 2)
		{

			priorCenter = faceFromEyes(priorCenter, frame_gray(r));

			// Generate temporary face location
			temp = outputFrame(frame, priorCenter, w, h);
		}
	}

	// Check to see if new face found
	if (temp.size().width > 2)

	{

		output = temp;
	}
	else
	{

		output = frame;
	}
	// Display only face


	imshow("Face   ", output);

	if (output.size().width > 2)

		// Draw ellipse around face
		//ellipse(frame, priorCenter, Size(w / 2, h / 2),0, 0, 360, Scalar(255, 0, 255), 4, 8, 0);

	{

		//Point pt(priorCenter.x + w, priorCenter.y + h);
		// Point pt2(priorCenter.x, priorCenter.y);
		//rectangle(output, pt2, pt, CV_RGB(255, 0, 0), 2, CV_AA);
		ellipse(frame, priorCenter, Size(w / 2, h / 2), 0, 0, 360, Scalar(255, 0, 255), 4, 8, 0);


		//rectangle(frame, priorCenter,priorCenter CV_RGB(255, 0, 0), 2, CV_AA);

		// Display output
		imshow("output  ", frame);
	}