NDLI: Fast and Accurate Detection of Document Skew and Orientation

Content Provider	IEEE Xplore Digital Library
Author	Shijian Lu Jie Wang Chew Lim Tan
Copyright Year	2007
Description	Author affiliation: Nat. Univ. of Singapore, Singapore (Shijian Lu; Jie Wang; Chew Lim Tan)
Abstract	This paper presents a document skew and orientation detection technique. The proposed technique estimates document skew and orientation based on the observation that text images normally hold a large amount of equidistant interline spacings and the number of character ascenders is statistically much larger than that of character descenders. Given a document image with arbitrary skew and orientation, white run histograms are first constructed through scanning documents in horizontal and vertical directions. Document skew is then estimated by using the white runs that exactly span the interline spacing. Lastly, document orientation is determined according to the numbers of character ascenders and descenders, which are detected by using the white runs that cross the interline spacing and lie over character ascenders and descenders. Experiments show that the proposed technique is fast, accurate, and capable of detecting arbitrary document skew and orientation.
Starting Page	684
Ending Page	688
File Size	891767
Page Count	5
File Format	PDF
ISBN	9780769528229
ISSN	15205363
DOI	10.1109/ICDAR.2007.4377002
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-23
Publisher Place	Brazil
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Histograms Optical distortion Optical character recognition software Nearest neighbor searches Labeling Computer science Text analysis Image analysis Character recognition Image retrieval
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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