Document skew estimation: an approach based on wavelets

  • Authors:

  • V. N. Manjunath Aradhya

  • Affiliations:

  • Dayananda Sagar College of Engineering, Bangalore, India

  • Venue:
  • Proceedings of the 2011 International Conference on Communication, Computing & Security
  • Year:
  • 2011

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Abstract

Document skew estimation refers to the process of finding the angle of inclination made by the document with respect to horizontal axis. The skew introduced during the scanning process like this is inevitable, even slightest degree of skew will always be there irrespective of how the document is fed to the scanner: either manually or automatically. Hence, deskewing of the document is vital for achieving efficient results in downstream document analysis system (DAS) such as page layout analysis, optical character recognition (OCR), document retrieval etc. Although enormous amount of research has been conducted for document skew estimation, development of a solitary skew estimation approach that can handle all kinds of real time variation in documents is still an elusive goal for the research community. In this paper, we present a novel scheme for estimating document skew based on Wavelets. In the first stage, document images are moldered by the wavelet transform and efficient hough transform is used for estimating the skew of a document. Experimental results show that the method performs well on document images of complex layouts and to different scripts.