Effect of text orientation to OCR error and anti-skew of text using projective transform technique

Author

Jirasuwankul, N.

Author_Institution

Dept. of Electr. Eng., King Mongkut´s Inst. of Technoloy Ladkrabang (KMITL), Bangkok, Thailand

fYear

2011

fDate

3-7 July 2011

Firstpage

856

Lastpage

861

Abstract

In this paper, text orientation which affects to OCR output error together with corresponding correction technique was examined. In case of text oriented in 3D or tilted manner, conventional anti-skew technique such as Hough or Radon transform could fail and a technique of Projective transform is proposed. To illustrate the effectiveness of the technique, Arial and OCR-A extended font types had been tested by manipulating in both 2D and 3D orientations. The tested results from MATLAB and OCR freeware showed that OCR accuracy is sensitive to text orientation and the proposed technique can do anti-skew image of text from 2D scene which mapped from 3D object orientation.

Keywords

optical character recognition; text analysis; transforms; 3D object orientation; Hough transform; Matlab; OCR correction technique; OCR freeware; OCR output error; Radon transform; anti-skew image; anti-skew technique; optical character recognition; projective transform; text orientation; Accuracy; Materials; Optical character recognition software; Software tools; Three dimensional displays; Transforms; Transmission line matrix methods;

fLanguage

English

Publisher

ieee

Conference_Titel

Advanced Intelligent Mechatronics (AIM), 2011 IEEE/ASME International Conference on

Conference_Location

Budapest

ISSN

2159-6247

Print_ISBN

978-1-4577-0838-1

Type

conf

DOI

10.1109/AIM.2011.6027057

Filename

6027057