Iterated Large-Margin Discriminant Analysis for feature Dimensionality Reduction in medical image retrieval. (19th October 2011)

• Record Type: Journal Article
• Authors: Wang, Jingyan; Li, Yongping; Marchiori, Elena; Wang, Chao
• Is Part Of: International journal of biomedical engineering and technology. Volume 7:Number 2(2011)
• Page Start: 116
• Page End: 134
• Publication Date: 2011-10-19
• Subjects: medical image retrieval -- DR -- dimensionality reduction -- class conditional neighbouring graph -- iterated large-margin discriminat analysis -- expectation-maximisation framework; Biomedical engineering -- Periodicals; 610.28
• Languages: English
• ISSNs: 1752-6418

Abstract

Feature Dimensionality Reduction (DR) is an important topic in medical image retrieval. However, most medical image retrieval systems use naive principal component analysis for DR, which is not optimal. Recently, the class conditional nearest neighbour relation over pairs of points was introduced. In this paper, we extend it to class conditional K-nearest neighbour (ccknn). Based on ccknn, we define the within-class and between-class graph for Large-Margin Discriminat Analysis (LMDA). Moreover, an iterative expectation-maximisation framework is applied to LMDA to boost the performance. The experimental results demonstrate that the proposed approach yields significant improvements over the state-of-the-art DR algorithms.