Added overlay with control options

FacialRec.cpp

@@ -36,7 +36,13 @@ int main() {
 			return 1;
 		}
 
-		imshow("Webcam", frame);
+		//show some test text
+		Mat frame_with_text = frame.clone();
+		putText(frame_with_text, "Press Spacebar to take a picture", Point2f(110,100), FONT_HERSHEY_SIMPLEX, 2.0,  Scalar(255,0,0,0), 3);
+		putText(frame_with_text, "Press ESC to close the application", Point2f(90,600), FONT_HERSHEY_SIMPLEX, 2.0,  Scalar(0,0,255,255), 3);
+
+		imshow("Webcam", frame_with_text);
+
 		key = waitKey(30);
 
 		if (key == 27) { //escape key pressed: stop program
@@ -44,18 +50,23 @@ int main() {
 			break;
 		}
 		else if (key == ' ') { //spacebar pressed: take a picture
+
 			picture = frame;
 			key = -1;
 
 			while (true) {
-				imshow("Webcam", picture);
+				Mat picture_with_text = picture.clone();
+				putText(picture_with_text, "Press 's' to save", Point2f(375,100), FONT_HERSHEY_SIMPLEX, 2.0,  Scalar(255,0,0,0), 3);
+				putText(picture_with_text, "Press ESC/Spacebar to return", Point2f(160,600), FONT_HERSHEY_SIMPLEX, 2.0,  Scalar(0,0,255,255), 3);
+
+				imshow("Webcam", picture_with_text);
 
 				key = waitKey(30);
 
-				if (key == 27 || key == 32) {
+				if (key == 27 || key == 32) { //spacebar or ESC pressed
 					cout << "ESC or SPACE pressed. Returning to video..." << endl;
 					break;
-				} else if (key == 115) {
+				} else if (key == 115) { //s pressed
 					bool maybe = imwrite("./testimage.jpg", picture);
 					cout << "s was pressed. saving image " << maybe << endl;
 				}