Document Abstract

Cheng B*, Wang R*, Antani S, Stanley RJ*, Thoma GR.

Graphical Image Classification Combining an Evolutionary Algorithm and Binary Particle Swarm Optimization.

Proceedings of the SPIE, Document Recognition and Retrieval XIX. 2012;8297:829703-1-8.

Biomedical journal articles contain a variety of image types that can be broadly classified into two categories: regular images, and graphical images. Graphical images can be further classified into four classes: diagrams, statistical figures, flow charts, and tables. Automatic figure type identification is an important step toward improved multimodal (text + image) information retrieval and clinical decision support applications. This paper describes a feature-based learning approach to automatically identify these four graphical figure types. We apply Evolutionary Algorithm (EA), Binary Particle Swarm Optimization (BPSO) and a hybrid of EA and BPSO (EABPSO) methods to select an optimal subset of extracted image features that are then classified using a Support Vector Machine (SVM) classifier. Evaluation performed on 1038 figure images extracted from ten BioMedCentral (R) journals with the features selected by EABPSO yielded classification accuracy as high as 87.5%.

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