An Analysis and Implementation of the Shape Preserving Local Histogram Modification Algorithm

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Communicated by Jean-Michel Morel, Miguel Colom
Demo edited by Jose-Luis Lisani

Abstract

In this paper we describe the implementation of the algorithm for local contrast enhancement published by Caselles et al. in 1999. This algorithm was the first designed explicitly to increase the contrast while preserving the so-called 'shape structure' of the image, that is, its set of level sets. According to the mathematical morphology school, artifacts are created when this structure is modified. The original algorithm is described and also two alternative implementations are proposed, which limit the over-enhancement of noise.

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  Software Heritage Archive @softwareversion{sw-ipol.2018.236, title = {{An Analysis and Implementation of the Shape Preserving}}, author = {Jose-Luis Lisani}, date = {2018-11-14}, license = {GPL-3.0-or-later}, version = {3.0}, swhid = {swh:1:dir:d85591aeefea2c1c58142e34683fd1923b19c895;origin=https://doi.org/10.5201/ipol.2018.236;visit=swh:1:snp:e0674ffb865529b05511808d1ee7ba5d72346009;anchor=swh:1:rev:fad7a0486bb7a7cfdbb1c28e28a64f2d3f5e0df9}, related = {ipol.2018.236}, relatedtype = "Reference article: https://doi.org/10.5201/ipol.2018.236" } % the biblatex-software style extension is recommended for software bibitems
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History

• Note from the editor: the manuscript of the article was modified on 2022-01-01 to include information about its editors. The original version of the manuscript is available here.