published
    2018-12-07 
reference
    Jose-Luis Lisani, An Analysis and Implementation of the Shape Preserving Local Histogram Modification Algorithm, Image Processing On Line, 8 (2018), pp. 408–434. https://doi.org/10.5201/ipol.2018.236

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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    full text manuscript: PDF low-res. (957KB) PDF (92.7MB) [?]
    source code: TAR/GZ

Description

Given an input image this demo computes the result of the three versions of the MLHE algorithm described in the associated article: MLHE HE, MLHE PAE and MLHE CLAHE. The users can select the parameters of each method. The default parameters are the same described in the article. For comparison, the results of classical histogram equalization (HE) and CLAHE are also displayed. We use obtained the Matlab implementation of the CLAHE algorithm. Both HE and CLAHE are applied on the intensity component of the input image and the output color image is obtained as in the MLHE methods.
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@article{ipol.2018.236,
    title   = {{An Analysis and Implementation of the Shape Preserving Local Histogram 
Modification Algorithm}},
    author  = {Lisani, Jose-Luis},
    journal = {{Image Processing On Line}},
    volume  = {8},
    pages   = {408--434},
    year    = {2018},
    doi     = {10.5201/ipol.2018.236},
}
% if your bibliography style doesn't support doi fields:
    note    = {\url{https://doi.org/10.5201/ipol.2018.236}}

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        <codemeta:keywords>local processing</codemeta:keywords>
        <codemeta:dateCreated>2018-11-14</codemeta:dateCreated>
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11:49 <+ardumont> i think it's more that the 3 deposits were done very closely
11:49 <+ardumont> and that the chaining happens if you use the same slug and that you have a deposit done already
11:49 <+ardumont> which with the current slugishness scheduler side cannot happen
11:49 <+ardumont> moranegg[m]: i'm more and more convinced that the issue is that the 3 deposits (which are only minute-separated) where checked and injected almost at the same time
11:52 <+ardumont> tl; dr; for the chaining, slug is a necessary condition but it's not sufficient ¯\_(ツ)_/¯

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