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

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Official URL: https://doi.org/10.1007/s11760-008-0090-3

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.

Creators(s):	Mahmoud, T. and Marshall, S. ORCID: https://orcid.org/0000-0001-7079-5628;
Item type:	Article
ID code:	14686
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:	05 Sep 2020 00:56
URI:	https://strathprints.strath.ac.uk/id/eprint/14686
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