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Lossless Contrast Enhancement of Color Images with Reversible Data Hiding

Recently, lossless contrast enhancement (CE) has been proposed so that a contrast-changed image can be converted to its original version by maintaining information entropy in it. As most of the lossless CE methods are proposed for grayscale images, artifacts are probably introduced after directly ap...

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Autores principales: Wu, Hao-Tian, Wu, Yue, Guan, Zhihao, Cheung, Yiu-ming
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7515439/
http://dx.doi.org/10.3390/e21090910
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author Wu, Hao-Tian
Wu, Yue
Guan, Zhihao
Cheung, Yiu-ming
author_facet Wu, Hao-Tian
Wu, Yue
Guan, Zhihao
Cheung, Yiu-ming
author_sort Wu, Hao-Tian
collection PubMed
description Recently, lossless contrast enhancement (CE) has been proposed so that a contrast-changed image can be converted to its original version by maintaining information entropy in it. As most of the lossless CE methods are proposed for grayscale images, artifacts are probably introduced after directly applying them to color images. For instance, color distortions may be caused after CE is separately conducted in each channel of the RGB (red, green, and blue) model. To cope with this issue, a new scheme is proposed based on the HSV (hue, saturation, and value) color model. Specifically, both hue and saturation components are kept unchanged while only the value component is modified. More precisely, the ratios between the RGB components are maintained while a reversible data hiding method is applied to the value component to achieve CE effects. The experimental results clearly show CE effects obtained with the proposed scheme, while the original color images can be perfectly recovered. Several metrics including image entropy were adopted to measure the changes made in CE procedure, while the performances were compared with those of one existing scheme. The evaluation results demonstrate that better image quality and increased information entropy can be simultaneously achieved with our proposed scheme.
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spelling pubmed-75154392020-11-09 Lossless Contrast Enhancement of Color Images with Reversible Data Hiding Wu, Hao-Tian Wu, Yue Guan, Zhihao Cheung, Yiu-ming Entropy (Basel) Article Recently, lossless contrast enhancement (CE) has been proposed so that a contrast-changed image can be converted to its original version by maintaining information entropy in it. As most of the lossless CE methods are proposed for grayscale images, artifacts are probably introduced after directly applying them to color images. For instance, color distortions may be caused after CE is separately conducted in each channel of the RGB (red, green, and blue) model. To cope with this issue, a new scheme is proposed based on the HSV (hue, saturation, and value) color model. Specifically, both hue and saturation components are kept unchanged while only the value component is modified. More precisely, the ratios between the RGB components are maintained while a reversible data hiding method is applied to the value component to achieve CE effects. The experimental results clearly show CE effects obtained with the proposed scheme, while the original color images can be perfectly recovered. Several metrics including image entropy were adopted to measure the changes made in CE procedure, while the performances were compared with those of one existing scheme. The evaluation results demonstrate that better image quality and increased information entropy can be simultaneously achieved with our proposed scheme. MDPI 2019-09-18 /pmc/articles/PMC7515439/ http://dx.doi.org/10.3390/e21090910 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wu, Hao-Tian
Wu, Yue
Guan, Zhihao
Cheung, Yiu-ming
Lossless Contrast Enhancement of Color Images with Reversible Data Hiding
title Lossless Contrast Enhancement of Color Images with Reversible Data Hiding
title_full Lossless Contrast Enhancement of Color Images with Reversible Data Hiding
title_fullStr Lossless Contrast Enhancement of Color Images with Reversible Data Hiding
title_full_unstemmed Lossless Contrast Enhancement of Color Images with Reversible Data Hiding
title_short Lossless Contrast Enhancement of Color Images with Reversible Data Hiding
title_sort lossless contrast enhancement of color images with reversible data hiding
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7515439/
http://dx.doi.org/10.3390/e21090910
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AT cheungyiuming losslesscontrastenhancementofcolorimageswithreversibledatahiding