Abstract
Automatic classification is one of the basic tasks required in any pattern recognition and human computer interaction application. In this paper, we discuss training probabilistic classifiers with labeled and unlabeled data. We provide a new analysis that shows under what conditions unlabeled data can be used in learning to improve classification performance. We also show that, if the conditions are violated, using unlabeled data can be detrimental to classification performance. We discuss the implications of this analysis to a specific type of probabilistic classifiers, Bayesian networks, and propose a new structure learning algorithm that can utilize unlabeled data to improve classification. Finally, we show how the resulting algorithms are successfully employed in two applications related to human-computer interaction and pattern recognition: facial expression recognition and face detection.
Original language | English (US) |
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Pages (from-to) | 1553-1567 |
Number of pages | 15 |
Journal | IEEE transactions on pattern analysis and machine intelligence |
Volume | 26 |
Issue number | 12 |
DOIs | |
State | Published - Dec 2004 |
Keywords
- Bayesian network classifiers
- Face detection
- Facial expression recognition
- Generative models
- Semisupervised learning
- Unlabeled data
ASJC Scopus subject areas
- Software
- Computer Vision and Pattern Recognition
- Computational Theory and Mathematics
- Artificial Intelligence
- Applied Mathematics