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Proceedings Paper

Fast algorithm for skew detection
Author(s): Adnan Amin; Stephen Fischer; Anthony F. Parkinson; Ricky Shiu
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Paper Abstract

Document image processing has become an increasingly important technology in the automation of office documentation tasks. Automatic document scanners such as text readers and OCR (optical character recognition) systems are an essential component of systems capable of those tasks. One of the problems in this field is that the document to be read is not always placed correctly on a flat-bed scanner. This means that the document may be skewed on the scanner bed, resulting in a skewed image. This skew has a detrimental effect on document analysis, document understanding, and character segmentation and recognition. Consequently, detecting the skew of a document image and correcting it are important issues in realizing a practical document reader. In this paper we describe new algorithms for skew detection and skew correction. We then compare the performance and results of this skew detection algorithm to other published methods from O'Gorman, Hinds, Le, Baird, and Postl. Finally, we discuss the theory of skew detection and the different approaches taken to solve the problem of skew in documents. The skew correction algorithm we propose has been shown to be extremely fast, with run times averaging under 0.25 CPU seconds to calculate the angle on a DEC 5000/20 workstation.

Paper Details

Date Published: 5 March 1996
PDF: 12 pages
Proc. SPIE 2661, Real-Time Imaging, (5 March 1996); doi: 10.1117/12.234639
Show Author Affiliations
Adnan Amin, Univ. of New South Wales (Australia)
Stephen Fischer, Univ. of New South Wales (Australia)
Anthony F. Parkinson, Univ. of New South Wales (Australia)
Ricky Shiu, Univ. of New South Wales (Australia)


Published in SPIE Proceedings Vol. 2661:
Real-Time Imaging
Phillip A. Laplante; Alexander D. Stoyenko; Divyendu Sinha, Editor(s)

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