Patent ID: 9666088
Date: 2017-05-30
CPC Classifications: G06K,G07C,G09B

Claim:
1. A method using a video based teaching aid, the method comprising: (I) performing an off-line training process, which includes: (i) acquiring a surveillance video sequence using at least one video camera operatively connected to a computer; (ii) for a given video image frame in the video sequence, detecting one or more face images present in the video image frame; (iii) for at least one detected face image, automatically performing facial region operations; (iv) processing each detected face image to increase robustness to lighting and scale variation; (v) assigning each detected face image to an expression category or label; (vi) calculating representative features for the face image; (vii) determining a correspondence between the representative features and the expression category or label; (viii) repeating the expression category or labeling steps of (ii)-(vii) until all faces of interest have been processed resulting in a labeled feature set; and (ix) training a classifier using the labeled feature set; (II) performing online operations which include: