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Multiscale histogram of oriented gradient descriptors for robust character recognition

Newell, AJ; Griffin, LD; (2011) Multiscale histogram of oriented gradient descriptors for robust character recognition. Proceedings of the International Conference on Document Analysis and Recognition, ICDAR 1085 - 1089. 10.1109/ICDAR.2011.219.

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Abstract

Characters extracted from images or graphics pose a challenge for traditional character recognition techniques. The high degree of intraclass variation along with the presence of clutter makes accurate recognition difficult, yet the semantic information conveyed by sections of text within images or graphics makes their recognition an important problem. Previous work has shown that, on the two most commonly used datasets of such characters, Histogram of Oriented Gradient (HOG) descriptors have outperformed other methods. In this work we consider two extensions of the HOG descriptor to include features at multiple scales, and evaluate their performance using characters taken from images and graphics. We demonstrate that, by combining pairs of oriented gradients at different scales, it's possible to achieve an increase in performance of 12.4% and 5.6% on the two datasets. © 2011 IEEE.

Type:Article
Title:Multiscale histogram of oriented gradient descriptors for robust character recognition
DOI:10.1109/ICDAR.2011.219
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > CoMPLEX - Maths and Physics in the Life Sciences and Experimental Biology

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