A new technique for global and local skew correction in binary documents

Authors:
Michael Makridis;Nikos Nikolaou;Nikos Papamarkos
Affiliations:
Image Processing and Multimedia Laboratory, Department of Electrical & Computer Engineering, Democritus University of Thrace, Xanthi, Greece;Image Processing and Multimedia Laboratory, Department of Electrical & Computer Engineering, Democritus University of Thrace, Xanthi, Greece;Image Processing and Multimedia Laboratory, Department of Electrical & Computer Engineering, Democritus University of Thrace, Xanthi, Greece
Venue:
ACIVS'07 Proceedings of the 9th international conference on Advanced concepts for intelligent vision systems
Year:
2007

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Abstract

A new technique for global and local skew correction in binary documents is proposed. The proposed technique performs a connected component analysis and for each connected component, document's local skew angle is estimated, based on detecting a sequence of other consecutive connected components, at certain directions, within a specified neighborhood. A histogram of all local skew angles is constructed. If the histogram has one peak then global skew correction is performed, otherwise the document has more than one skews. For local skew correction, a page layout analysis is performed based on a boundary growth algorithm at different directions. The exact global or local skew is approached with a least squares line fitting procedure. The accuracy of the technique has been tested using many documents of different skew and it is compared with two other similar techniques.