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| Boffety, Matthieu; Galland, Frederic; Allais, Anne-gaelle. |
| Underwater images often suffer from poor visibility due to photon scattering. However, in some cases, optical polarization filtering techniques can decrease the contribution of the scattered light and improve the visual image quality. In this Letter, the influence of these techniques for underwater image registration is analyzed, particularly when backscattered light is the main perturbation induced by the submarine environment. This analysis is performed using the Cramer-Rao bound and relies on a standard image formation model, taking into account various kinds of noises. (C) 2012 Optical Society of America |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00098/20924/20055.pdf |
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| Fabri, Marie-claire; Vinha, Beatriz; Allais, Anne-gaelle; Bouhier, Marie-edith; Dugornay, Olivier; Gaillot, Arnaud; Arnaubec, Aurelien. |
| Cold-water coral ecosystems have been identified as vulnerable, but quantitative data on their conservation status is very limited. The Marine Strategy Framework Directive (MSFD) is the tool implemented by the European Union’s Integrated Maritime Policy to achieve Good Environmental Status (GES) of marine waters by 2020. In this context, the aim of this study was to evaluate the Ecological Status of benthic habitats in Cassidaigne canyon, focusing in particular on cold-water coral habitats dominated by Madrepora oculata. Data were collected during the Videocor1 cruise (2017). Videos and photos collected during eight dives of the H-ROV Ariane were used to reconstruct, in 3-dimensions, the areas where cnidarians have settled in the canyon. A total of 33 3D... |
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Palavras-chave: Biodiversity; Photogrammetry; Habitat mapping; Bauxite residues; Vulnerable marine ecosystems. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00511/62293/66719.pdf |
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| Bottefy, Matthieu; Galland, Frederic; Allais, Anne-gaelle. |
| Underwater optical image simulation is a valuable tool for oceanic science, especially for the characterization of image processing techniques such as color restoration. In this context simulating images with a correct color rendering is crucial. This paper presents an extension of existing image simulation models to RGB imaging. The influence of the spectral discretization of the model parameters on the color rendering of the simulated images is studied. It is especially shown that, if only RGB data of the scene chosen for simulations are available, a spectral reconstruction step prior to the simulations improves the image color rendering. |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00087/19819/17502.pdf |
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| Allais, Anne-gaelle; Bouhier, Marie-edith; Edmond, Toussaint; Maciol, Nicolas; Nicolas, Stephane; Boffety, M.; Galland, Frederic; Chami, Malik; Ebert, Kerstin. |
| We present an original simulator - called SOFI - for the synthetic generation of underwater optical images. The simulator architecture is flexible and relies on flow diagrams in order to allow the integration of various models for image generation which are based on the underwater optical phenomena. The objective is also to ensure real time or quasi real time performance so it takes advantage of the latest technologies, such as GPGPU, and relies on GPU programming under CUDA. Two kinds of models for image generation are presented and should be integrated in SOFI: (1) the OSOA model based on the radiative transfer theory and (2) global image modeling which describes globally how an image is deteriorated under the effects of sea water. |
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Palavras-chave: Simulator; GPU; GPGPU; Underwater; Radiative transfer; Image modeling. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00072/18326/16012.pdf |
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| Marcon, Yann; Sahling, Heiko; Allais, Anne-gaelle; Bohrmann, Gerhard; Olu, Karine. |
| The Regab pockmark is a large cold seep area located 10 km north of the Congo deep sea channel at about 3160 m water depth. The associated ecosystem hosts abundant fauna, dominated by chemosynthetic species such as the mussel Bathymodiolus aff. boomerang, vestimentiferan tubeworm Escarpia southwardae, and vesicomyid clams Laubiericoncha chuni and Christineconcha regab. The pockmark was visited during the West African Cold Seeps (WACS) cruise with RV Pourquoi Pas? in February 2011, and a 14,000-m2 high-resolution videomosaic was constructed to map the most populated area and to describe the distribution of the dominant megafauna (mussels, tubeworms and clams). The results are compared with previous published works, which also included a videomosaic in the... |
| Tipo: Text |
Palavras-chave: Cold seep; Fauna; Mosaic; Pockmark; Regab; Temporal variation. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00144/25528/23765.pdf |
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