title: Multiview locally linear embedding for effective medical image retrieval.
abstract: Content-based medical image retrieval continues to gain attention for its potential to assist radiological image interpretation and decision making. Many approaches have been proposed to improve the performance of medical image retrieval system, among which visual features such as SIFT, LBP, and intensity histogram play a critical role. Typically, these features are concatenated into a long vector to represent medical images, and thus traditional dimension reduction techniques such as locally linear embedding (LLE), principal component analysis (PCA), or laplacian eigenmaps (LE) can be employed to reduce the "curse of dimensionality". Though these approaches show promising performance for medical image retrieval, the feature-concatenating method ignores the fact that different features have distinct physical meanings. In this paper, we propose a new method called multiview locally linear embedding (MLLE) for medical image retrieval. Following the patch alignment framework, MLLE preserves the geometric structure of the local patch in each feature space according to the LLE criterion. To explore complementary properties among a range of features, MLLE assigns different weights to local patches from different feature spaces. Finally, MLLE employs global coordinate alignment and alternating optimization techniques to learn a smooth low-dimensional embedding from different features. To justify the effectiveness of MLLE for medical image retrieval, we compare it with conventional spectral embedding methods. We conduct experiments on a subset of the IRMA medical image data set. Evaluation results show that MLLE outperforms state-of-the-art dimension reduction methods.
authors.affiliation: State Key Laboratory of Software Development Environment, School of Computer Science and Engineering, Beihang University, Beijing, China.
authors.forename: Hualei
authors.initials: H
authors.lastname: Shen
authors.affiliation: Center for Quantum Computation and Intelligent Systems, Faculty of Engineering and Information Technology, University of Technology, Sydney, New South Wales, Australia.
authors.forename: Dacheng
authors.initials: D
authors.lastname: Tao
authors.affiliation: State Key Laboratory of Software Development Environment, School of Computer Science and Engineering, Beihang University, Beijing, China.
authors.forename: Dianfu
authors.initials: D
authors.lastname: Ma
mesh_terms: D000465:Algorithms; D003952:Diagnostic Imaging; D006801:Humans; D016247:Information Storage and Retrieval; D025341:Principal Component Analysis; D012372:ROC Curve; D012680:Sensitivity and Specificity