A new algorithm for skew detection and correction
Pattern Recognition Letters
A fast skew detection and correction algorithm for machine printed words in Gurmukhi script
Proceedings of the International Workshop on Multilingual OCR
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In this paper, a range free skew detection technique for machine printed Gurmukhi documents has been presented. This approach can easily be extended to other Indian language scripts such as Devnagri and Bakngla. Most characters in these scripts have horizontal lines at the top called headlines. The characters forming a word are joined at top by headlines, so that the word appears as one single component with headline. The ratio of pixel density above and below the headline of any word in Gurmukhi script is always less than 1.These inherent characteristics of the script have been employed and a new algorithm based on projection profile method has been devised. By inspecting horizontal and vertical projections at different angles in range [0 °, 90 °], the skew angle of the document in range [-180 °, 180 °] can be determined. Thus this approach is not limited to any range of skew angle and skewness in any document with orientation portrait or landscape and placed at any angle can easily be detected and removed.