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Article

A Contrast-Guided Approach for the Enhancement of Low-Lighting Underwater Images

1
Department of Electrical & Computer Engineering, University of Victoria, Victoria, BC V8P3E6, Canada
2
Ocean Networks Canada and Department of Computer Science, University of Victoria, Victoria, BC V8N1V8, Canada
*
Author to whom correspondence should be addressed.
Received: 15 June 2019 / Revised: 14 September 2019 / Accepted: 23 September 2019 / Published: 1 October 2019
Underwater images are often acquired in sub-optimal lighting conditions, in particular at profound depths where the absence of natural light demands the use of artificial lighting. Low-lighting images impose a challenge for both manual and automated analysis, since regions of interest can have low visibility. A new framework capable of significantly enhancing these images is proposed in this article. The framework is based on a novel dehazing mechanism that considers local contrast information in the input images, and offers a solution to three common disadvantages of current single image dehazing methods: oversaturation of radiance, lack of scale-invariance and creation of halos. A novel low-lighting underwater image dataset, OceanDark, is introduced to assist in the development and evaluation of the proposed framework. Experimental results and a comparison with other underwater-specific image enhancement methods show that the proposed framework can be used for significantly improving the visibility in low-lighting underwater images of different scales, without creating undesired dehazing artifacts. View Full-Text
Keywords: image enhancement; image dehazing; underwater image analysis image enhancement; image dehazing; underwater image analysis
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MDPI and ACS Style

Porto Marques, T.; Branzan Albu, A.; Hoeberechts, M. A Contrast-Guided Approach for the Enhancement of Low-Lighting Underwater Images. J. Imaging 2019, 5, 79. https://0-doi-org.brum.beds.ac.uk/10.3390/jimaging5100079

AMA Style

Porto Marques T, Branzan Albu A, Hoeberechts M. A Contrast-Guided Approach for the Enhancement of Low-Lighting Underwater Images. Journal of Imaging. 2019; 5(10):79. https://0-doi-org.brum.beds.ac.uk/10.3390/jimaging5100079

Chicago/Turabian Style

Porto Marques, Tunai, Alexandra Branzan Albu, and Maia Hoeberechts. 2019. "A Contrast-Guided Approach for the Enhancement of Low-Lighting Underwater Images" Journal of Imaging 5, no. 10: 79. https://0-doi-org.brum.beds.ac.uk/10.3390/jimaging5100079

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