Rapid and brief communication: Local structure based supervised feature extraction

Authors:
Haitao Zhao;Shaoyuan Sun;Zhongliang Jing;Jingyu Yang
Affiliations:
Institute of Aerospace Science & Technology, Shanghai Jiaotong University, 1954, Hua Shan Road, Shanghai, 200030, PR China;Automation Department, Dong Hua University, Shanghai, PR China;Institute of Aerospace Science & Technology, Shanghai Jiaotong University, 1954, Hua Shan Road, Shanghai, 200030, PR China;Department of Computer Science, Nanjing University of Science and Technology, Nanjing, PR China
Venue:
Pattern Recognition
Year:
2006

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Abstract

In the past few years, the computer vision and pattern recognition community has witnessed the rapid growth of a new kind of feature extraction method, the manifold learning methods, which attempt to project the original data into a lower dimensional feature space by preserving the local neighborhood structure. Among them, locality preserving projection (LPP) is one of the most promising feature extraction techniques. However, when LPP is applied to the classification tasks, it shows some limitations, such as the ignorance of the label information. In this paper, we propose a novel feature extraction method, called locally discriminating projection (LDP). LDP utilizes class information to guide the procedure of feature extraction. In LDP, the local structure of the original data is constructed according to a certain kind of similarity between data points, which takes special consideration of both the local information and the class information. The similarity has several good properties which help to discover the true intrinsic structure of the data, and make LDP a robust technique for the classification tasks. We compare the proposed LDP approach with LPP, as well as other feature extraction methods, such as PCA and LDA, on the public available data sets, FERET and AR. Experimental results suggest that LDP provides a better representation of the class information and achieves much higher recognition accuracies.