Camera-based Kanji OCR for Mobile-phones: Practical Issues

Authors:
Masashi Koga;Ryuji Mine;Tatsuya Kameyama;Toshikazu Takahashi;Masahiro Yamazaki;Teruyuki Yamaguchi
Affiliations:
Hitachi Central Research Laboratory, Tokyo, Japan;Hitachi Central Research Laboratory, Tokyo, Japan;Hitachi Central Research Laboratory, Tokyo, Japan;Hitachi Central Research Laboratory, Tokyo, Japan;Hitachi Ubiquitous System Platform R&D Laboratory, Yokohama, Japan;Hitachi-Omron Terminal Solutions, Corp., Owariasahi, Japan
Venue:
ICDAR '05 Proceedings of the Eighth International Conference on Document Analysis and Recognition
Year:
2005

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Abstract

A camera-based optical character reader (OCR) for Japanese Kanji characters was implemented on a mobile-phone. This OCR has three key features. The first is discriminative feature extraction (DFE) which enables a character classifier needing only small memory size. The second is a word-segmentation method specially designed for looking up Japanese words in a dictionary. The third feature is a GUI suitable for a mobile-phone. A prototype mobile-phone Kanji OCR was constructed and experimentally tested. Recognition accuracy of over 95% was obtained under the best conditions, which shows the potential of our prototype as a new type of electronic dictionary.