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A Novel blending technique for underwater gigamosaicing

The fusion of several images of the same scene into a single and larger composite is known as photomosaicing. Unfortunately, the seams along image boundaries are often noticeable, due to photometrical and geometrical registration inaccuracies. Image blending is the merging step in which those artifacts are minimized. Processing bottlenecks and the lack of medium-specific processing tools have restricted underwater photomosaics to small areas despite the hundreds of thousands of square meters that modern surveys can cover. Large underwater photomosaics are increasingly in demand for the characterization of the seafloor for scientific purposes. Producing these mosaics is difficult due to the challenging nature of the underwater environment and the image acquisition conditions, including extreme depth, scattering and light attenuation phenomena, and difficulties in vehicle navigation and positioning. This paper proposes strategies and solutions to tackle the problems of very large underwater optical surveys (gigamosaics), presenting contributions in the image preprocessing, enhancing, and blending steps, resulting in an improved visual quality in the final photomosaic. A comprehensive review of the existing methods is also presented and discussed. Our approach is validated by a large optical survey of a deep-sea hydrothermal field, leading to a high-quality composite in excess of 5 Gpixel

© IEEE Journal of Oceanic Engineering, 2012, vol. 33, núm. 4, p. 626-644

IEEE

Author: Prados Gutiérrez, Ricard
García Campos, Rafael
Grácias, Nuno Ricardo Estrela
Escartín, Javier
Neumann, László
Date: 2012 October
Abstract: The fusion of several images of the same scene into a single and larger composite is known as photomosaicing. Unfortunately, the seams along image boundaries are often noticeable, due to photometrical and geometrical registration inaccuracies. Image blending is the merging step in which those artifacts are minimized. Processing bottlenecks and the lack of medium-specific processing tools have restricted underwater photomosaics to small areas despite the hundreds of thousands of square meters that modern surveys can cover. Large underwater photomosaics are increasingly in demand for the characterization of the seafloor for scientific purposes. Producing these mosaics is difficult due to the challenging nature of the underwater environment and the image acquisition conditions, including extreme depth, scattering and light attenuation phenomena, and difficulties in vehicle navigation and positioning. This paper proposes strategies and solutions to tackle the problems of very large underwater optical surveys (gigamosaics), presenting contributions in the image preprocessing, enhancing, and blending steps, resulting in an improved visual quality in the final photomosaic. A comprehensive review of the existing methods is also presented and discussed. Our approach is validated by a large optical survey of a deep-sea hydrothermal field, leading to a high-quality composite in excess of 5 Gpixel
Format: application/pdf
ISSN: 0364-9059
Document access: http://hdl.handle.net/10256/7901
Language: eng
Publisher: IEEE
Collection: MICINN/PN 2011-2014/CTM2010-15216
CIDEM/2009-2012/VALTEC09-2-0122
Versió postprint del document publicat a: http://dx.doi.org/10.1109/JOE.2012.2204152
Articles publicats (D-ATC)
info:eu-repo/grantAgreement/EC/FP7/288704
Is part of: © IEEE Journal of Oceanic Engineering, 2012, vol. 33, núm. 4, p. 626-644
Rights: Tots els drets reservats
Subject: Imatges -- Processament -- Tècniques digitals
Image processing -- Digital techniques
Imatge, Tècniques d’
Imaging systems
Fons marins
Ocean bottom
Title: A Novel blending technique for underwater gigamosaicing
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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