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Images are frequently used in articles to convey essential information in context with correlated text. However, searching images in a task-specific way poses significant challenges. To minimize limitations of low-level feature representations in content-based image retrieval (CBIR), and to complement text-based search, we propose a multi-modal image search approach that exploits hierarchical organization of modalities and employs both intra and inter-modality fusion techniques. For the CBIR search, several visual features were extracted to represent the images. Modality-specific information was used for similarity fusion and selection of a relevant image subset. Intra-modality fusion of retrieval results was performed by searching images for specific informational elements. Our methods use text extracted from relevant components in a document to create structured representations as “enriched citations” for the text-based search approach. Finally, the multi-modal search consists of a weighted linear combination of similarity scores of independent output results from textual and visual search approaches (inter modality). Search results were evaluated using a standard ImageCLEFmed 2012 evaluation dataset of 300,000 images with associated annotations. We achieved a mean average precision (MAP) score of 0.2533, which is statistically significant, and better in performance (7 % improvement) over comparable results in ImageCLEFmed 2012.

Multimodal biomedical image retrieval using hierarchical classification and modality fusion