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Proceedings Paper

Distortion corrections for better character recognition of camera-based document images
Author(s): YunKoo Chung; DaeGeun Jang; WonPil Yu; SooYoung Chi; KyeKyung Kim; Jung Soh
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Paper Abstract

The usage of cellular camera phones and digital cameras is rapidly increasing. but camera imaging application is not so expanded due to the lack of practical camera imaging technology. Especially the acquisition environments of camera images are very different from those of scanner images. The status of light condition, viewing distance and viewing angles constantly varies in case of cameras. The variations of light condition and viewing distance make it difficult to extract character areas from images through binarization and the variation of camera viewing angles makes the images distorted geometrically. Therefore, the extraction of character areas for camera document images is far more complex and difficult than for scanner images. In this paper, these problems are totally discussed and the resolving methods are suggested for better image recognition. The solutions such as adaptive binarization, color conversion, correction of lens distortion and geometrical distortion correction are discussed and the correction methods are suggested for accurate document image recognition. In experiment, we use the various types of document images captured by mobile phone cameras and digital cameras. The results of distortion correction show that our image processing methods are efficient to increase the accuracy of character recognition for camera based document image.

Paper Details

Date Published: 9 December 2004
PDF: 11 pages
Proc. SPIE 5578, Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education, (9 December 2004); doi: 10.1117/12.567034
Show Author Affiliations
YunKoo Chung, Electronics and Telecommunications Research Institute (South Korea)
DaeGeun Jang, Electronics and Telecommunications Research Institute (South Korea)
WonPil Yu, Electronics and Telecommunications Research Institute (South Korea)
SooYoung Chi, Electronics and Telecommunications Research Institute (South Korea)
KyeKyung Kim, Electronics and Telecommunications Research Institute (South Korea)
Jung Soh, Electronics and Telecommunications Research Institute (South Korea)


Published in SPIE Proceedings Vol. 5578:
Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education
Marc Nantel; Glen Herriot; Graham H. McKinnon; Leonard MacEachern; Robert A. Weersink; Rejean Munger; Andrew Ridsdale, Editor(s)

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