A Rational Unsharp Masking Technique (1998)
| Venue: | Journal of Electronic Imaging |
| Citations: | 13 - 4 self |
BibTeX
@ARTICLE{Ramponi98arational,
author = {Giovanni Ramponi and Andrea Polesel},
title = {A Rational Unsharp Masking Technique},
journal = {Journal of Electronic Imaging},
year = {1998},
volume = {7},
pages = {333--338}
}
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Abstract
The linear Unsharp Masking technique used in image contrast enhancement is modified in this paper, by introducing a control term expressed as a rational function of the local input data. In this way, noise amplification is avoided and, at the same time, overshoot effects on sharp edges are limited. Experimental results support the validity of the method, even as a preprocessor for interpolation systems. Keywords: Image enhancement, Unsharp Masking, Rational filters, Nonlinear operators. I. Introduction The technique of Unsharp Masking (UM) was introduced in photography to improve the quality of pictures by making their details crisper; it consisted in optically subtracting a blurred copy of an image from the image itself. Its digital version, due to its simplicity and relative effectiveness, has become a tool of widespread use in the image processing community, described in any textbook [1] and included in many available software packages (e.g., [2]). In digital image manipulation, i...
