The vision based mind state recognition

They say that facial expressions are the window of human mind states. By interpreting the mind states, we can achieve a smooth interaction between human and machines. In this paper, we try to handle human mind states. We use vector chain code method to indicate a change of the face. The vector chain code can encode the direction information and distance information altogether. Through experiments, a method utilizing a vector chain code that presented in this paper was more improved rather than the method using the conventional chain code.