Sorry to create a new thread , but I just need some suggestions.I need to write a java code with opencv to distinguish a person having closed eye fro a person having open eye.What is the best approach to be taken? 1)To train a haar classifier with closed eye and then implement it in the code? 2)use HoughCircles() method to detect the eye ball? I am asking this question because I have gone through some questions and answers in the forum and got to know that haar training is not giving a suitable output. If that is the answer what is to be done to implement the HoughCircle? Or are there any other solutions to this problem? Please Help Thanks in advance