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An Ensemble SSL Algorithm for Efficient Chest X-Ray Image Classification

Computer & Informatics Engineering Department, Technological Educational Institute of Western Greece, GR 263-34 Antirion, Greece
Department of Mathematics, University of Patras, GR 265-00 Patras, Greece
Author to whom correspondence should be addressed.
J. Imaging 2018, 4(7), 95;
Received: 21 May 2018 / Revised: 3 July 2018 / Accepted: 13 July 2018 / Published: 20 July 2018
(This article belongs to the Special Issue Image Based Information Retrieval from the Web)
PDF [357 KB, uploaded 20 July 2018]


A critical component in the computer-aided medical diagnosis of digital chest X-rays is the automatic detection of lung abnormalities, since the effective identification at an initial stage constitutes a significant and crucial factor in patient’s treatment. The vigorous advances in computer and digital technologies have ultimately led to the development of large repositories of labeled and unlabeled images. Due to the effort and expense involved in labeling data, training datasets are of a limited size, while in contrast, electronic medical record systems contain a significant number of unlabeled images. Semi-supervised learning algorithms have become a hot topic of research as an alternative to traditional classification methods, exploiting the explicit classification information of labeled data with the knowledge hidden in the unlabeled data for building powerful and effective classifiers. In the present work, we evaluate the performance of an ensemble semi-supervised learning algorithm for the classification of chest X-rays of tuberculosis. The efficacy of the presented algorithm is demonstrated by several experiments and confirmed by the statistical nonparametric tests, illustrating that reliable and robust prediction models could be developed utilizing a few labeled and many unlabeled data. View Full-Text
Keywords: semi-supervised learning; self-labeled methods; ensemble learning; classification; voting semi-supervised learning; self-labeled methods; ensemble learning; classification; voting

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Livieris, I.E.; Kanavos, A.; Tampakas, V.; Pintelas, P. An Ensemble SSL Algorithm for Efficient Chest X-Ray Image Classification. J. Imaging 2018, 4, 95.

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