Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
Underwater imaging has become a staple tool used by scientists exploring the deep ocean. Advanced camera systems are able to combine quantitative measurements from in-situ sensors with qualitative imaging to provide high fidelity multi-dimensional datasets which can be used to support a wide range of science questions. This includes benthic characterization and mapping, identification of biota and...
This paper focus on the use of unmanned aerial vehicle teams for performing cooperative perception using Data Distribution Service (DDS) Network. We develop a DDS framework to manage the incoming and out bounding network traffic of multiple types of data that is exchanged inside the UAV network. Experimental results both in laboratory and in actual flight are presented to help characterize the proposed...
Generally, underwater hull inspection have been conducted by human divers. It is an extremely dangerous task, and hence, can be a potential application for unmanned underwater vehicles. The operational safety and performance of in-water inspection can be significantly improved by introducing unmanned vehicle systems. This study addresses the development of an hover-capable autonomous underwater vehicle...
The frequency of storm surge impacts in western Alaska are likely to increase due to current warming trends leading to accelerated rates of erosion and further inland extent of marine inundation. This leaves the low-lying coastal communities of western Alaska vulnerable to storm surge hazards, especially because our ability to assess risk is hampered by large gaps in monitoring equipment and minimal...
An automated docking system is presented for an autonomous underwater vehicle utilizing light-field imaging for navigation guidance. This article focuses on three major components of the system: docking position acquisition with light-field imaging, optimal docking trajectory planning, and nonlinear trajectory tracking control. With the camera sensor data of each photographic exposure, depth maps...
The effects of marine and instream energy devices on fish populations are not well-understood, and studying the behavior of fish around these devices is challenging. To address this problem, we have evaluated algorithms to automatically detect fish in underwater video and propose a semi-automated method for ocean and river energy device ecological monitoring. The key contributions of this work are...
For many existing inspection class ROV designs, a powered umbilical was the obvious choice as a means of providing system power. But advances in battery capability, coupled with the sheer diversity of applications and associated task requirements for which ROVs are now being targeted, has resulted in an interesting tradeoff between the capabilities of umbilical versus battery power. This paper will...
In this work we are describing a multi-modal short-range navigation system for precision positioning tasks such as docking of a robotic vehicle in 3d space. The two input modalities, a monocular camera tracking a visual marker and an array of 3-axis magnetometers tracking a magnet, were chosen to cover a wide range of environmental conditions in order to increase the versatility and robustness of...
Vision methods are very commonly used in underwater robotics. However, the cameras must be enclosed in a sealed housing for which flat-pane windows are the most economical and hence most popular solution. But they cause non-trivial refraction-based distortions at the air-glass-water interface. Recently, a new model for underwater cameras calibration called Pinax was introduced, which combines aspects...
An emerging environmental issue for the world's oceans is the accumulation of plastic debris on or near the ocean surface. A novel collaboration between The Ocean Cleanup foundation and Teledyne Optech — an aerial survey with the Optech CZMIL system, data processing and analysis — is expected to provide initial volume estimates for future debris collection by The Ocean Cleanup.
Refraction of light underwater is a major source of error for 3D reconstruction. Use of a physically correct camera model taking into account properties of the optical system is essential for understanding the reasons why errors occur and obtaining quantitative estimates of errors. It was proven that use of the single viewpoint model of the camera leads to significant distortions in reconstruction...
This paper proposes and implements a convolutional neural network (CNN) that maps images from a camera to an error signal to guide and control an autonomous underwater vehicle into the entrance of a docking station. The paper proposes to use an external positioning system synchronized with the vehicle to obtain a dataset of images matched with the position and orientation of the vehicle. By using...
With the development of marine industry, the requirements for safety and reliability of deep-sea operation equipment are getting higher and higher. Experimental test is an important part of detecting the performance of deep-sea operation equipment. The deep-sea pressure environment simulation device is used as a device to detect the performance of deep-sea operation equipment. The requirements of...
Powered umbilical ROVs have steadily increased in capabilities and utilization for applications in deep water where they can be readily “flown” to perform inspections and survey projects. But the littoral zone, where surf conditions, insufficient depth, and the hazards of shore proximity present special challenges, remains relatively unexplored. SurfROVer is a battery-operated crawler that is the...
Hadal science has become one of the research frontiers in earth sciences in recent years. Free-fall vehicle, also known as “lander” has provided new opportunities to investigate the hadal zone. Two hadal expeditions in the Mariana Trench were conducted successively with the support of Chinese Academy of Sciences since last June to this March. Two 7000-meter rating landers named Tian Ya and Hai Jiao...
The seafloor high-definition camera (CamHD) installed on the Ocean Observatories Initiative (OOI) Cabled Array (CA) provides real-time video of the Mushroom vent at the ASHES hydrothermal field in the Axial Volcano caldera on the Juan de Fuca spreading zone (Figure 1). CamHD performs a pre-programmed 13-minute motion sequence every 3 hours. The video captured during this sequence is stored as a 13GB...
In this paper, we propose an automatic shark detection method in deep sea by light section method, in order to realize shark observation with much less energy. This method detects sharks on the basis of cross-sectional shape obtained by light section method. To analyze the performance of the proposed method, experiments at aquariums was conducted. It was observed that detection accuracy became high...
The Ocean Observatories Initiative (OOI) has a SubC 1Cam high-definition video camera (CAMHD) delivering real-time data since August 2015 from inside the caldera of Axial Seamount volcano, approximately 450 kilometers off the coast of Washington. These data are archived on the OOI's raw data repository at Rutgers University and are publicly available for download via the Apache HTTP Server endpoint...
Underwater images suffer from extremely unfavourable conditions. Light is heavily attenuated and scattered. Attenuation creates change in hue, scattering causes so called veiling light. General state of the art methods for enhancing image quality are either unreliable or cannot be easily used in underwater operations. On the other hand there is a well known method for haze removal in air, called Dark...
To take samples from the seabed in hazardous, unapproachable waters, we have developed a new observation system that can take samples from the seabed by remote control. Operating this system in such hazardous waters presents the risk of losing it. Therefore, we designed and built a simple and cheap prototype based on existing technologies and knowhow JAMSTEC has obtained at sea. We conducted sea trials...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.