The ROV 3D Project

Drap, Pierre; Seinturier, Julien; Hijazi, Bilal; Merad, Djamal; Boï, Jean-Marc; Chemisky, Bertrand; Seguin, Emmanuelle; Long, Luc

doi:10.1145/2757283

Cited by 50 publications

(22 citation statements)

References 12 publications

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“…From the collected images it is possible to obtain photomosaics of the seafloor combining different video frames. In some cases, thanks to photogrammetry, the images can be used to interpret the 3D morphology of objects in the pictures (see, e.g., Drap et al, 2015 andPrice et al, 2019 for photogrammetry applications to corals and archeological remains in deep sea, respectively). This can be achieved either using stereophotographic cameras or combining sufficient overlapping consecutive photographs from a single moving camera (Huvenne et al, 2018).…”

Section: Monitoring the Presence Of Macro-litter On The Seafloormentioning

confidence: 99%

How to Deal With Seafloor Marine Litter: An Overview of the State-of-the-Art and Future Perspectives

et al. 2020

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Marine litter is a significant and growing pollutant in the oceans. In recent years, the number of studies and initiatives trying to assess and tackle the global threat of marine litter has grown exponentially. Most of these studies, when considering macro-litter, focus on floating or stranded litter, whereas there is less information available about marine litter on the seabed. The aim of this article is to give an overview of the current state-of-the-art methods to address the issue of seafloor macro-litter pollution. The overview includes the following topics: the monitoring of macro-litter on the seafloor, the identification of possible litter accumulation hot spots on the seafloor through numerical models, and seafloor litter management approaches (from removal protocols to recycling processes). The article briefly analyzes the different approaches to involve stakeholders, since the marine litter topic is strongly related to the societal engagement. Finally, attempting to answer to all the critical aspects highlighted in the overview, the article highlights the need of innovative multi-level solutions to induce a change toward sustainable practices, transforming a problem into a real circular economy opportunity.

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Section: Monitoring the Presence Of Macro-litter On The Seafloormentioning

confidence: 99%

How to Deal With Seafloor Marine Litter: An Overview of the State-of-the-Art and Future Perspectives

et al. 2020

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“…• 5-GoPro: 5-head camera system with GoPro cameras named GoPro41 to GoPro45, where GoPro45 is the nadir looking camera. Flat with red filters (glass) 1 The +4 diopter allowed the camera to properly focus underwater at the shortest focal length (i.e., at 18 mm). All the camera systems were tested at two different heights, or working distances, above the reef at 2 and 5 m (except for the D300, which was used at a working distance of 2 m only) with the additional goal of investigating distance-dependent-induced errors and assessing the accuracy of the photogrammetrically derived products.…”

Section: Comparison Of Diver-operated Underwater Photogrammetric Systemsmentioning

confidence: 99%

“…Underwater photogrammetry has increasingly become a popular technique for three-dimensional (3D) mapping of subaquatic environments at different spatial scales and resolution. In underwater scenarios, several application domains can be identified, such as deep-sea exploration [1]), archeology [2], marine ecology [3][4][5] and sub-sea metrology [6], each of them with specific requirements and constraints. In marine ecology, photogrammetry acts as a game changer, allowing ecologists to obtain non-invasive, objective measurements of the underwater habitat structure and complexity, crucial in understanding the health and temporal changes of benthic communities.…”

Section: Introductionmentioning

confidence: 99%

“…In marine ecology, photogrammetry acts as a game changer, allowing ecologists to obtain non-invasive, objective measurements of the underwater habitat structure and complexity, crucial in understanding the health and temporal changes of benthic communities. Numerous examples in the literature describe research and experiments that have utilized photogrammetry carried out by scuba divers [7][8][9], as well as by remotely operated or autonomous underwater vehicles [1]. Metric characterizations and monitoring of coral reefs have greatly benefitted from the growing availability of affordable and easy-to-use hardware and software tools [10].…”

Section: Introductionmentioning

confidence: 99%

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Coral Reef Monitoring by Scuba Divers Using Underwater Photogrammetry and Geodetic Surveying

et al. 2020

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Underwater photogrammetry is increasingly being used by marine ecologists because of its ability to produce accurate, spatially detailed, non-destructive measurements of benthic communities, coupled with affordability and ease of use. However, independent quality control, rigorous imaging system set-up, optimal geometry design and a strict modeling of the imaging process are essential to achieving a high degree of measurable accuracy and resolution. If a proper photogrammetric approach that enables the formal description of the propagation of measurement error and modeling uncertainties is not undertaken, statements regarding the statistical significance of the results are limited. In this paper, we tackle these critical topics, based on the experience gained in the Moorea Island Digital Ecosystem Avatar (IDEA) project, where we have developed a rigorous underwater photogrammetric pipeline for coral reef monitoring and change detection. Here, we discuss the need for a permanent, underwater geodetic network, which serves to define a temporally stable reference datum and a check for the time series of photogrammetrically derived three-dimensional (3D) models of the reef structure. We present a methodology to evaluate the suitability of several underwater camera systems for photogrammetric and multi-temporal monitoring purposes and stress the importance of camera network geometry to minimize the deformations of photogrammetrically derived 3D reef models. Finally, we incorporate the measurement and modeling uncertainties of the full photogrammetric process into a simple and flexible framework for detecting statistically significant changes among a time series of models.

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“…Approaches 2 are performed in many cases using standard software. (Drap et al, 2015) uses the relative orientation to provide scale and the interior orientation is assumed to be known by pre calibration. Approach 3 is investigated for a single camera bundle (objectinvariant) by (Mulsow, 2010) but, best to our knowledge, not for a multi-camera system yet.…”

Section: System Configuration and Calibration Strategiesmentioning

confidence: 99%

On Scale Definition Within Calibration of Multi-Camera Systems in Multimedia Photogrammetry

Kahmen

Rofallski

Conen

et al. 2019

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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<p><strong>Abstract.</strong> In multimedia photogrammetry, multi-camera systems often provide scale by a calibrated relative orientation. Camera calibration via bundle adjustment is a well-established standard procedure in single-medium photogrammetry. When using standard software and applying the collinearity equations in multimedia photogrammetry, the refractive interfaces are modelled in an implicit form. This contribution analyses different calibration strategies for bundle-invariant interfaces. To evaluate the effects of implicitly modelling the refractive effects within a bundle adjustment, synthetic datasets are simulated. Contrary to many publications, systematic effects of the exterior orientations can be verified with simulated data. The behaviour of interior, exterior and relative orientation parameters is analysed using error-free synthetic datasets. The relative orientation of a stereo camera shows systematic effects, when the angle of convergence varies and when the synthetic interface is set up at different distances to the camera. It becomes clear, that in most cases the implicit modelling is not suitable for multimedia photogrammetry. An explicit modelling of the refractive interfaces is implemented into a bundle adjustment. This strict model is analysed and compared with the implicit form regarding systematic effects in orientation parameters as well as errors in object space. In a real experiment, the discrepancies between the implicit form using standard software and the explicit modelling using our own implementation are quantified. It is highly advisable to model the interfaces strictly, since the implicit modelling might lead to relevant errors in object space.</p>

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The ROV 3D Project

Cited by 50 publications

References 12 publications

How to Deal With Seafloor Marine Litter: An Overview of the State-of-the-Art and Future Perspectives

How to Deal With Seafloor Marine Litter: An Overview of the State-of-the-Art and Future Perspectives

Coral Reef Monitoring by Scuba Divers Using Underwater Photogrammetry and Geodetic Surveying

On Scale Definition Within Calibration of Multi-Camera Systems in Multimedia Photogrammetry

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