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Ensemble Approaches to Facial Action Unit Classification

Windeatt, T and Dias, K (2008) Ensemble Approaches to Facial Action Unit Classification In: 13th Iberoamerican Congress on Progress in Pattern Recognition, Image Analysis and Applications, 2008-09-09 - 2008-09-12, Havana, CUBA.

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Abstract

Facial action unit (au) classification is an approach to face expression recognition that decouples the recognition of expression from individual actions. In this paper, upper face aus are classified using an ensemble of MLP (Multi-layer perceptron) base classifiers with feature ranking based on PCA components. This approach is compared experimentally with other popular feature-ranking methods applied to Gabor features. Experimental results on Cohn-Kanade database demonstrate that the MLP ensemble is relatively insensitive to the feature-ranking method but optimized PCA features achieve lowest error rate. When posed as a multi-class problem using Error- Correcting-Output-Coding (ECOC), error rates are comparable to two-class problems (one-versus-rest) when the number of features and base classifier are optimized.

Item Type: Conference or Workshop Item (Paper)
Additional Information: The original publication is available at http://www.springerlink.com
Uncontrolled Keywords: Ensembles, ECOC, FACS, Feature-ranking, FEATURE-SELECTION, FEATURE SUBSETS
Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Centre for Vision Speech and Signal Processing
Depositing User: Symplectic Elements
Date Deposited: 17 Feb 2012 11:59
Last Modified: 23 Sep 2013 19:03
URI: http://epubs.surrey.ac.uk/id/eprint/135501

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