We present the Computer Expression Recognition Toolbox (CERT), a software tool for fully automatic real-time facial expression recognition, and officially release it for free academic use. CERT can automatically code the intensity of 19 different facial actions from the Facial Action Unit Coding System (FACS) and 6 different prototypical facial expressions. It also estimates the locations of 10 facial features as well as the 3-D orientation (yaw, pitch, roll) of the head. On a database of posed facial expressions, Extended Cohn-Kanade (CK+[1]), CERT achieves an average recognition performance (probability of correctness on a two-alternative forced choice (2AFC) task between one positive and one negative example) of 90.1% when analyzing facial actions. On a spontaneous facial expression dataset, CERT achieves an accuracy of nearly 80%. In a standard dual core laptop, CERT can process 320 × 240 video images in real time at approximately 10 frames per second.
JF - 2011 IEEE International Conference on Automatic Face Gesture Recognition and Workshops (FG 2011) PB - IEEE CY - Santa Barbara, CA SN - 978-1-4244-9140-7 ER - TY - CONF T1 - Learning to Make Facial Expressions T2 - IEEE 8th International Conference on Development and Learning, 2009. ICDL 2009 Y1 - 2009 A1 - Wu, T. A1 - Butko, N. A1 - Ruvulo, P. A1 - Bartlett, M. A1 - Movellan, J. KW - Actuators KW - Emotion recognition KW - face detection KW - face recognition KW - facial motor parameters KW - Feedback KW - Humans KW - learning (artificial intelligence) KW - Machine Learning KW - Magnetic heads KW - Pediatrics KW - real-time facial expression recognition KW - Robot sensing systems KW - robotic head KW - Robots KW - self-guided learning KW - Servomechanisms KW - Servomotors AB -This paper explores the process of self-guided learning of realistic facial expression production by a robotic head with 31 degrees of freedom. Facial motor parameters were learned using feedback from real-time facial expression recognition from video. The experiments show that the mapping of servos to expressions was learned in under one-hour of training time. We discuss how our work may help illuminate the computational study of how infants learn to make facial expressions.
JF - IEEE 8th International Conference on Development and Learning, 2009. ICDL 2009 PB - IEEE CY - Shanghai SN - 978-1-4244-4117-4 ER - TY - JOUR T1 - Toward Practical Smile Detection JF - IEEE Transactions on Pattern Analysis and Machine Intelligence Y1 - 2009 A1 - Whitehill, J. A1 - Littlewort, G. A1 - Fasel, I. A1 - Bartlett, M. A1 - Movellan, J. KW - Algorithms KW - Artificial intelligence KW - Automated KW - automatic facial expression recognition research KW - Biological Pattern Recognition KW - Biometry KW - Computer simulation KW - Computer vision KW - Computer-Assisted KW - Face KW - Face and gesture recognition KW - face recognition KW - feature representation KW - human-level expression recognition accuracy KW - illumination conditions KW - Image databases KW - Image Enhancement KW - Image Interpretation KW - image registration image representation KW - learning (artificial intelligence) KW - machine learning approaches KW - Machine Learning Models KW - n Humans KW - object detection KW - practical smile detection KW - Reproducibility of Results KW - Sensitivity and Specificity KW - Smiling KW - Subtraction Technique KW - training data set KW - visual databases AB -Machine learning approaches have produced some of the highest reported performances for facial expression recognition. However, to date, nearly all automatic facial expression recognition research has focused on optimizing performance on a few databases that were collected under controlled lighting conditions on a relatively small number of subjects. This paper explores whether current machine learning methods can be used to develop an expression recognition system that operates reliably in more realistic conditions. We explore the necessary characteristics of the training data set, image registration, feature representation, and machine learning algorithms. A new database, GENKI, is presented which contains pictures, photographed by the subjects themselves, from thousands of different people in many different real-world imaging conditions. Results suggest that human-level expression recognition accuracy in real-life illumination conditions is achievable with machine learning technology. However, the data sets currently used in the automatic expression recognition literature to evaluate progress may be overly constrained and could potentially lead research into locally optimal algorithmic solutions.
VL - 31 IS - 11 ER - TY - CONF T1 - Analysis of machine learning methods for real-time recognition of facial expressions from video T2 - Computer Vision and Pattern Recognition: Face Processing Workshop Y1 - 2004 A1 - Littlewort, G. A1 - Bartlett, M. A1 - Fasel, I. A1 - Chenu, J. A1 - Movellan, J. JF - Computer Vision and Pattern Recognition: Face Processing Workshop ER - TY - JOUR T1 - Towards social robots: Automatic evaluation of human-robot interaction by face detection and expression classification JF - Advances in Neural Information Processing Systems Y1 - 2004 A1 - Littlewort, G. A1 - Bartlett, M. A1 - Chenu, J. A1 - Fasel, I. A1 - Kanda, T. A1 - Ishiguro, H. A1 - Movellan, J. VL - 16 ER -