Confidence assessment on eyelid and eyebrow expression recognition

In this paper, we address the recognition of subtle facial expressions by reasoning on the classification confidence. Psychological evidences have determined that eyelids and eyebrows are significant for the recognition of subtle facial expressions and the early perception of human emotions. This early perception results in a more complex problem, which requires a confidence assessment for any provided solution. Thus, traditional score-based classifiers (e.g. kNN and NN) are not able to produce confident estimates. Instead, we first present five confidence estimators and a confidence classification assessment for Case-Based Reasoning (CBR). Second, we improve the expression retrieval from the database by learning the neighbourhood's dimensions for the expected classification confidences. Third, we reuse the previous classified expressions and the confidence assessment to improve the classification achieved by k-NN. Fourth, we improve the database for generalization with new subje...

• Type: Conference
• Year: 2008
• Where: FGR
• Authors: Javier Orozco, Ognjen Rudovic, F. Xavier Roca, Jordi Gonzàlez
• Keywords: Biometrics, Confidence Assessment, Early Perception, FGR 2008, Subtle Facial Expressions