Développement d'un piège photo sous-marin a déclenchement automatique
Développement d'un piège photo sous-marin a déclenchement automatique
Développement d'un piège photo sous-marin a déclenchement automatique
Date du jour :
06.05.2020
Catégorie du document :
Articles scientifiques
Discipline :
Océanographie
Nom du ou des auteurs :
Kresimir Williams, Alex De Robertis, Zachary Berkowitz, Chris Rooper, Rick Towler
A retenir :
Un système stéréo à déclenchement automatique pour des profondeurs moyennes.
Résumé / Abstract :
"This paper describes the design and deployment of a new type of underwater stereo camera capable of triggering when animals are present in the field of view. Unobtrusive evaluation of the camera view field for potential targets is achieved using far-red illumination invisible to most fishes. The triggered camera (TrigCam?) system is designed to be low cost by incorporating off-the-shelf commercial camera and computer components. It also incorporates several novel software and hardware developments such as the Cannon Hackers Development Kit which provides a high degree of control over the cameras, and a Raspberry Pi computer-on-board module for low-power, cost-efficient computing. The innovative triggering algorithm for fine control of the size and intensity of targets necessary to trigger an image is described in detail. Stereo image analysis provides estimates of fish size, position, and orientation to provide quantitative data from images. Test field deployments demonstrate operational capacity and illustrate potential applications for sampling marine organisms through example descriptions of analytical methods, including the trigger process and stereo image analysis. The TrigCam? is intended to be an open source project to encourage continued development within the marine research community, with design information available through internet posts."
Kite Aerial Photography for Low-Cost, Ultra-high Spatial Resolution Multi-Spectral Mapping of Intertidal Landscapes
Kite Aerial Photography for Low-Cost, Ultra-high Spatial Resolution Multi-Spectral Mapping of Intertidal Landscapes
Date du jour :
29.12.2020
Catégorie du document :
Articles scientifiques
Discipline :
Sciences participatives, Océanographie, Autres
Nom du ou des auteurs :
Mitch Bryson , Matthew Johnson-Roberson, Richard J. Murphy, Daniel Bongiorno
Date du document :
19.09.2013
A retenir :
Une étude Australienne qui emploi le cerf volant pour photographier la zone intertidale.
Résumé / Abstract :
Intertidal ecosystems have primarily been studied using field-based sampling; remote sensing offers the ability to collect data over large areas in a snapshot of time that could complement field-based sampling methods by extrapolating them into the wider spatial and temporal context. Conventional remote sensing tools (such as satellite and aircraft imaging) provide data at limited spatial and temporal resolutions and relatively high costs for small-scale environmental science and ecologically-focussed studies. In this paper, we describe a low-cost, kite-based imaging system and photogrammetric/mapping procedure that was developed for constructing high-resolution, three-dimensional, multi-spectral terrain models of intertidal rocky shores. The processing procedure uses automatic image feature detection and matching, structure-from-motion and photo-textured terrain surface reconstruction algorithms that require minimal human input and only a small number of ground control points and allow the use of cheap, consumer-grade digital cameras. The resulting maps combine imagery at visible and near-infrared wavelengths and topographic information at sub-centimeter resolutions over an intertidal shoreline 200 m long, thus enabling spatial properties of the intertidal environment to be determined across a hierarchy of spatial scales. Results of the system are presented for an intertidal rocky shore at Jervis Bay, New South Wales, Australia. Potential uses of this technique include mapping of plant (micro- and macro-algae) and animal (e.g. gastropods) assemblages at multiple spatial and temporal scales.
Lien vers l'article :
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0073550#s1
KOSMOS, le Kit d'Observation Sous-Marine Open Source
KOSMOS, le Kit d'Observation Sous-Marine Open Source
Nom de l'auteur :
Ifremer / Konk Ar Lab
Budget moyen nécessaire à la fabrication :
800 - 1000 €
Type de données récoltées :
Vidéos HD et mesures de pressions et de températures
Résumé / Abstract :
Une caméra sous-marine pivotante. C'est un système d'observation de la faune marine et des habitats par l'imagerie panoramique. Tout d'abord développé par Ifremer sous le nom de STAVIRO et MICADO, le KOSMOS en est une adaptation open source. Il se déploie facilement d'une embarcation pour une plongée d'une quinzaine de minutes avant d'être relevé pour pouvoir être à nouveau déposé sur un autre point.
Lien vers l'article :
https://wikifactory.com/@gheleguen/kosmos-20-r%C3%A9alisation
Texte à ajouter sur le bouton :
Voir le wiki
La fish cam une caméra sous-marine pour moins de 500$
La fish cam une caméra sous-marine pour moins de 500$
Date du jour :
16.06.2020
Catégorie du document :
Articles scientifiques
Discipline :
Sciences participatives, Océanographie
Nom du ou des auteurs :
Xavier Mouy ; Morgan Black ; Kieran Cox ; Jessica Qualley ; Callum Mireault ; Stan Dosso ; Francis Juanes
Date du document :
01.10.2020
Résumé / Abstract :
"We describe the “FishCam?”, a low-cost (500 USD) autonomous camera package to record videos and images underwater. The system is composed of easily accessible components and can be programmed to turn ON and OFF on customizable schedules. Its 8-megapixel camera module is capable of taking 3280 × 2464-pixel images and videos. An optional buzzer circuit inside the pressure housing allows synchronization of the video data from the FishCam? with passive acoustic recorders. Ten FishCam? deployments were performed along the east coast of Vancouver Island, British Columbia, Canada, from January to December 2019. Field tests demonstrate that the proposed system can record up to 212 h of video data over a period of at least 14 days. The FishCam? data collected allowed us to identify fish species and observe species interactions and behaviors. The FishCam? is an operational, easily-reproduced and inexpensive camera system that can help expand both the temporal and spatial coverage of underwater observations in ecological research. With its low cost and simple design, it has the potential to be integrated into educational and citizen science projects, and to facilitate learning the basics of electronics and programming."
Lien vers l'article :
https://www.sciencedirect.com/science/article/pii/S2468067220300195?via%3Dihub