10 research outputs found
Integration of optical and acoustic sensors for D underwater scene reconstruction.
Get PDFCombination of optical and acoustic sensors to overcome the shortcomings
presented by optical systems in underwater 3D acquisition is an emerging field
of research. In this work, an opti-acoustic system composed by a single camera and
a multibeam sonar is proposed, providing a simulation environment to validate its
potential use in 3D reconstruction. Since extrinsic calibration is a prerequisite for this
kind of feature-level sensor fusion, an effective approach to address the calibration
problem between a multibeam and a camera system is presented.Peer Reviewe
Two-dimensional forward-looking sonar image registration by maximization of peripheral mutual information
Get PDFIntegration of optical and acoustic sensors for D underwater scene reconstruction.
No full textCombination of optical and acoustic sensors to overcome the shortcomings
presented by optical systems in underwater 3D acquisition is an emerging field
of research. In this work, an opti-acoustic system composed by a single camera and
a multibeam sonar is proposed, providing a simulation environment to validate its
potential use in 3D reconstruction. Since extrinsic calibration is a prerequisite for this
kind of feature-level sensor fusion, an effective approach to address the calibration
problem between a multibeam and a camera system is presented.Peer Reviewe
Recurrent spatial transformer network for high‐accuracy image registration in moving PCB defect detection
No full textThe Kallisti Limnes, carbon dioxide-accumulating subsea pools
No full textNatural CO2 releases from shallow marine hydrothermal vents are assumed to mix into the water column, and not accumulate into stratified seafloor pools. We present newly discovered shallow subsea pools located within the Santorini volcanic caldera of the Southern Aegean Sea, Greece, that accumulate CO2 emissions from geologic reservoirs. This type of hydrothermal seafloor pool, containing highly concentrated CO2, provides direct evidence of shallow benthic CO2 accumulations originating from sub-seafloor releases. Samples taken from within these acidic pools are devoid of calcifying organisms, and channel structures among the pools indicate gravity driven flow, suggesting that seafloor release of CO2 at this site may preferentially impact benthic ecosystems. These naturally occurring seafloor pools may provide a diagnostic indicator of incipient volcanic activity and can serve as an analog for studying CO2 leakage and benthic accumulations from subsea carbon capture and storage sites
A pattern analysis based underwater video segmentation system for target object detection
No full text
