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Table structure extraction from form documents based on gradient-wavelet scheme

Authors
Xi, DHLee, SW
Issue Date
1999
Publisher
SPRINGER-VERLAG BERLIN
Citation
DOCUMENT ANALYSIS SYSTEMS: THEORY AND PRACTICE, v.1655, pp.240 - 254
Indexed
SCIE
SCOPUS
Journal Title
DOCUMENT ANALYSIS SYSTEMS: THEORY AND PRACTICE
Volume
1655
Start Page
240
End Page
254
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/124421
ISSN
0302-9743
Abstract
Based on gradient and wavelet analyses, a novel scheme has been developed to extract table structures from skewed form document images. In this scheme, first, a skewed form document image is rotated according to the angle obtained from the gradient algorithm. Then the deskewed image is decomposed into four sub-images by divisible Multiresolution Analysis(MRA) wavelets. Afterwards, the table structure image which represents the geometric structure of the form can be obtained from the sub-images by a modified wavelet reconstruction algorithm. Meanwhile, another document image without table lines can be produced by Minkowski operation and is referred to as a table free image. Experimental results indicate that this new scheme can be applied to process the skewed form document images with promising achievements.
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