Open Access

Piecewise Linear Model-Based Image Enhancement

EURASIP Journal on Advances in Signal Processing20042004:983173

Received: 1 September 2003

Published: 29 September 2004


A novel technique for the sharpening of noisy images is presented. The proposed enhancement system adopts a simple piecewise linear (PWL) function in order to sharpen the image edges and to reduce the noise. Such effects can easily be controlled by varying two parameters only. The noise sensitivity of the operator is further decreased by means of an additional filtering step, which resorts to a nonlinear model too. Results of computer simulations show that the proposed sharpening system is simple and effective. The application of the method to contrast enhancement of color images is also discussed.

Keywords and phrases:

image enhancementsharpeningnoise reductionnonlinear filters

Authors’ Affiliations

Department of Electrical, Electronic and Computer Engineering (DEEI), University of Trieste


© Russo 2004

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.