Journal
SIGNAL IMAGE AND VIDEO PROCESSING
Volume 6, Issue 1, Pages 159-169Publisher
SPRINGER LONDON LTD
DOI: 10.1007/s11760-010-0177-5
Keywords
Facial expression recognition; Emotion recognition; Mutual information; Higher order auto correlation; Gabor filters
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In this paper, we investigate feature extraction and feature selection methods as well as classification methods for automatic facial expression recognition (FER) system. The FER system is fully automatic and consists of the following modules: face detection, facial detection, feature extraction, selection of optimal features, and classification. Face detection is based on AdaBoost algorithm and is followed by the extraction of frame with the maximum intensity of emotion using the inter-frame mutual information criterion. The selected frames are then processed to generate characteristic features using different methods including: Gabor filters, log Gabor filter, local binary pattern (LBP) operator, higher-order local autocorrelation (HLAC) and a recent proposed method called HLAC-like features (HLACLF). The most informative features are selected based on both wrapper and filter feature selection methods. Experiments on several facial expression databases show comparisons of different methods.
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