Document image sharpening using a new extension of the aperture filter

Mahmoud, T. and Marshall, S. (2008) Document image sharpening using a new extension of the aperture filter. Signal, Image and Video Processing, 3 (4). pp. 403-419. ISSN 1863-1703

Abstract

A new extension to the aperture filter is proposed to sharpen document images. The aperture filter is a nonlinear filter applied within a window having both domain and range constraints. The proposed aperture filter incorporates an adaptation to the original design by utilizing gradient directions of the input document images. Results demonstrate that the performance of the new approach is superior to that of both the aperture filter and alternative sharpening methods.

ORCID iDs

Marshall, S. ORCID: https://orcid.org/0000-0001-7079-5628

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• Item metadata

  Item type:	Article
  ID code:	14686
  Dates:	Date Event 4 November 2008 Published
  Keywords:	nonlinear filter, document image sharpening, gradient edge direction, aperture filter, Electrical engineering. Electronics Nuclear engineering, Signal Processing, Electrical and Electronic Engineering
  Subjects:	Technology > Electrical engineering. Electronics Nuclear engineering
  Department:	Faculty of Engineering > Electronic and Electrical Engineering
  Depositing user:	Strathprints Administrator
  Date deposited:	01 Jul 2010 08:44
  Last modified:	20 Jan 2021 18:10
  URI:	https://strathprints.strath.ac.uk/id/eprint/14686