Affine invariant recognition of characters by progressive pruning

Akira Horimatsu, Ryo Niwa, Seiichi Uchida, Masakazu Iwamura, Shinichiro Omachi, Koichi Kise

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

There are many problems to realize camera-based character recognition. One of the problems is that characters in scenes are often distorted by geometric transformations such as affine distortions. Although some methods that remove the affine distortions have been proposed, they cannot remove a rotation transformation of a character. Thus a skew angle of a character has to be determined by examining all the possible angles. However, this consumes quite a bit of time. In this paper, in order to reduce the processing time for an affine invariant recognition, we propose a set of affine invariant features and a new recognition scheme called "progressive pruning." The progressive pruning gradually prunes less feasible categories and skew angles using multiple classifiers. We confirmed the progressive pruning with the affine invariant features reduced the processing time at least less than half without decreasing the recognition rate.

Original languageEnglish
Title of host publicationDAS 2008 - Proceedings of the 8th IAPR International Workshop on Document Analysis Systems
Pages237-244
Number of pages8
DOIs
Publication statusPublished - Dec 22 2008
Event8th IAPR International Workshop on Document Analysis Systems, DAS 2008 - Nara, Japan
Duration: Sep 16 2008Sep 19 2008

Publication series

NameDAS 2008 - Proceedings of the 8th IAPR International Workshop on Document Analysis Systems

Other

Other8th IAPR International Workshop on Document Analysis Systems, DAS 2008
CountryJapan
CityNara
Period9/16/089/19/08

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Information Systems

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  • Cite this

    Horimatsu, A., Niwa, R., Uchida, S., Iwamura, M., Omachi, S., & Kise, K. (2008). Affine invariant recognition of characters by progressive pruning. In DAS 2008 - Proceedings of the 8th IAPR International Workshop on Document Analysis Systems (pp. 237-244). [4669966] (DAS 2008 - Proceedings of the 8th IAPR International Workshop on Document Analysis Systems). https://doi.org/10.1109/DAS.2008.88