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Paper Abstract and Keywords
Presentation 2013-12-09 13:00
Removal of Uneven Shading from Document Image for OCR Using Surface Fitting with Piecewise Polynomials
Xiaohua Zhang (Hiroshima Inst. of Tech.), Yuelan Xin (Qinghai Norm. Univ.), Ning Xie (Tokyo Inst. of Tech.), Wenbo Jiang (Xihua Univ.), Yue Zhao (Hiroshima Inst. of Tech.)
Abstract (in Japanese) (See Japanese page) 
(in English) Binarization is regarded as a compulsory step to separate text and background. When document images are acquired under poor illumination, the images are soiled with uneven shading. This paper presents an approach for removing the uneven shading from document image. Piecewise polynomials are adopted in computing the background surface with complicated shading to be removed. The document image is divided into several blocks overlapped with each other to reduce the discontinuity between polynomials. The fitting is again adopted in the normalized image to estimate the coefficients of piecewise polynomials and the foreground text pixels are excluded as could as possible. Our experiments show that the proposed method can remove complicated shading well.
Keyword (in Japanese) (See Japanese page) 
(in English) Document Image Binarization / Piecewise Polynomials / Shading Removal / Surface Estimation / / / /  
Reference Info. ITE Tech. Rep., vol. 37, no. 56, ME2013-119, pp. 1-4, Dec. 2013.
Paper # ME2013-119 
Date of Issue 2013-12-02 (ME) 
ISSN Print edition: ISSN 1342-6893  Online edition: ISSN 2424-1970
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Conference Information
Committee ME  
Conference Date 2013-12-09 - 2013-12-10 
Place (in Japanese) (See Japanese page) 
Place (in English) Matuyasensen 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ME 
Conference Code 2013-12-ME 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Removal of Uneven Shading from Document Image for OCR Using Surface Fitting with Piecewise Polynomials 
Sub Title (in English)  
Keyword(1) Document Image Binarization  
Keyword(2) Piecewise Polynomials  
Keyword(3) Shading Removal  
Keyword(4) Surface Estimation  
1st Author's Name Xiaohua Zhang  
1st Author's Affiliation Hiroshima Institute of Technology (Hiroshima Inst. of Tech.)
2nd Author's Name Yuelan Xin  
2nd Author's Affiliation Qinghai Normal University (Qinghai Norm. Univ.)
3rd Author's Name Ning Xie  
3rd Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
4th Author's Name Wenbo Jiang  
4th Author's Affiliation Xihua University (Xihua Univ.)
5th Author's Name Yue Zhao  
5th Author's Affiliation Hiroshima Institute of Technology (Hiroshima Inst. of Tech.)
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Date Time 2013-12-09 13:00:00 
Presentation Time 25 
Registration for ME 
Paper # ITE-ME2013-119 
Volume (vol) ITE-37 
Number (no) no.56 
Page pp.1-4 
#Pages ITE-4 
Date of Issue ITE-ME-2013-12-02 

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