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Texture classification using feature selection and kernel-based techniques

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Abstract

The interpretation of the results in a classification problem can be enhanced, specially in image texture analysis problems, by feature selection techniques, knowing which features contribute more to the classification performance. This paper presents an evaluation of a number of feature selection techniques for classification in a biomedical image texture dataset (2-DE gel images), with the aim of studying their performance and the stability in the selection of the features. We analyse three different techniques: subgroup-based multiple kernel learning (MKL), which can perform a feature selection by down-weighting or eliminating subsets of features which shares similar characteristic, and two different conventional feature selection techniques such as recursive feature elimination (RFE), with different classifiers (naive Bayes, support vector machines, bagged trees, random forest and linear discriminant analysis), and a genetic algorithm-based approach with an SVM as decision function. The different classifiers were compared using a ten times tenfold cross-validation model, and the best technique found is SVM-RFE, with an AUROC score of (\(95.88 \pm 0.39\,\%\)). However, this method is not significantly better than RFE-TREE, RFE-RF and grouped MKL, whilst MKL uses lower number of features, increasing the interpretability of the results. MKL selects always the same features, related to wavelet-based textures, while RFE methods focuses specially co-occurrence matrix-based features, but with high instability in the number of features selected.

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Acknowledgments

This work is supported by “Collaborative Project on Medical Informatics (CIMED)” PI13/00280 funded by the Carlos III Health Institute from the Spanish National plan for Scientific and Technical Research and Innovation 2013–2016 and the European Regional Development Funds (FEDER), UK Medical Research Council (G10000427, MC_UU_12013/8) and “Development of new image analysis techniques in 2D Gel for Biomedical research” (ref. 10SIN105004PR) funded by Xunta de Galicia. The authors thank the Galicia Supercomputing Centre (CESGA) for the provision of computational support. The authors also thank Dr. G.-Z. Yang for providing the dataset.

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Authors and Affiliations

  1. Information and Communications Technologies Department, Faculty of Computer Science, University of A Coruña, Campus Elviña s/n, 15071, A Coruña, Spain

    Carlos Fernandez-Lozano, Marcos Gestal & Julian Dorado

  2. Bristol Genetic Epidemiology Laboratories, School of Social and Community Medicine, University of Bristol, Oakfield House, Oakfield Grove, Bristol, BS82BN, UK

    Jose A. Seoane

  3. Stanford Cancer Institute, Stanford School of Medicine, Stanford University, 780 Welch Road, Office CJ220, Palo Alto, CA, 94304, USA

    Jose A. Seoane

  4. MRC Integrative Epidemiology Unit, School of Social and Community Medicine, University of Bristol, Oakfield House, Oakfield Grove, Bristol, BS82BN, UK

    Tom R. Gaunt

  5. Intelligent Systems Laboratory, University of Bristol, Merchant Venturer’s Building, Bristol, BS81UB, UK

    Colin Campbell

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  1. Carlos Fernandez-Lozano
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Correspondence to Carlos Fernandez-Lozano.

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Fernandez-Lozano, C., Seoane, J.A., Gestal, M. et al. Texture classification using feature selection and kernel-based techniques. Soft Comput 19, 2469–2480 (2015). https://doi.org/10.1007/s00500-014-1573-5

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