Improving pattern spotting in historical documents using feature pyramid networks
| Autor: | Ignacio Úbeda, Laurent Heutte, Jose M. Saavedra, Caroline Petitjean, Stéphane Nicolas |
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| Rok vydání: | 2020 |
| Předmět: |
Computer science
business.industry Pattern recognition Context (language use) 02 engineering and technology Spotting Object (computer science) 01 natural sciences Convolutional neural network Artificial Intelligence Feature (computer vision) 0103 physical sciences Signal Processing 0202 electrical engineering electronic engineering information engineering 020201 artificial intelligence & image processing Computer Vision and Pattern Recognition Pyramid (image processing) Artificial intelligence 010306 general physics business Image retrieval Software Historical document |
| Zdroj: | Pattern Recognition Letters. 131:398-404 |
| ISSN: | 0167-8655 |
| DOI: | 10.1016/j.patrec.2020.02.002 |
| Popis: | Pattern spotting consists of locating different instances of a given object (i.e. an image query) in a collection of historical document images. These patterns may vary in shape, size, color, context and even style because they are hand-drawn, which makes pattern spotting a difficult task. To tackle this problem, we propose a Convolutional Neural Network (CNN) approach based on Feature Pyramid Networks (FPN) as the feature extractor of our system. Using FPN allows to extract descriptors of local regions of the documents to be indexed and queries, at multiple scales with just a single forward pass. Experiments conducted on DocExplore dataset show that the proposed system improves mAP by 73% (from 0.157 to 0.272) in pattern localization compared with state-of-the-art results, even when the feature extractor is not trained with domain-specific data. Memory requirement and computation time are also decreased since the descriptor dimension used for distance computation is reduced by a factor of 16. |
| Databáze: | OpenAIRE |
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