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Multiple kernel sparse representations for supervised and unsupervised learning.

Authors :
Thiagarajan JJ
Ramamurthy KN
Spanias A
Source :
IEEE transactions on image processing : a publication of the IEEE Signal Processing Society [IEEE Trans Image Process] 2014 Jul; Vol. 23 (7), pp. 2905-15. Date of Electronic Publication: 2014 May 09.
Publication Year :
2014

Abstract

In complex visual recognition tasks, it is typical to adopt multiple descriptors, which describe different aspects of the images, for obtaining an improved recognition performance. Descriptors that have diverse forms can be fused into a unified feature space in a principled manner using kernel methods. Sparse models that generalize well to the test data can be learned in the unified kernel space, and appropriate constraints can be incorporated for application in supervised and unsupervised learning. In this paper, we propose to perform sparse coding and dictionary learning in the multiple kernel space, where the weights of the ensemble kernel are tuned based on graph-embedding principles such that class discrimination is maximized. In our proposed algorithm, dictionaries are inferred using multiple levels of 1D subspace clustering in the kernel space, and the sparse codes are obtained using a simple levelwise pursuit scheme. Empirical results for object recognition and image clustering show that our algorithm outperforms existing sparse coding based approaches, and compares favorably to other state-of-the-art methods.

Details

Language :
English
ISSN :
1941-0042
Volume :
23
Issue :
7
Database :
MEDLINE
Journal :
IEEE transactions on image processing : a publication of the IEEE Signal Processing Society
Publication Type :
Academic Journal
Accession number :
24833593
Full Text :
https://doi.org/10.1109/TIP.2014.2322938