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Measuring Sandy Bottom Dynamics by Exploiting Depth from Stereo Video Sequences
[chapter]
2013
Lecture Notes in Computer Science
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The reconstruction is used by experts of the field to perform accurate measurements and analysis in the study of the final equilibrium conditions of sea bottoms in the presence of water flows. ...
In this paper an imaging system for measuring sandy bottom dynamics is proposed. The system exploits stereo sequences and projected laser beams to build the 3D shape of the sandy bottom during time. ...
In order to avoid any disturbance to the flow, the cameras are located outside of the flume, in front of glass walls in the correspondence of the measuring area. ...
doi:10.1007/978-3-642-41181-6_43
fatcat:d7kjwmicwzehnkeyqwsajedp5e
OPTICAL TECHNIQUES FOR MEASURING SWASH ZONE MORPHODYNAMICS
2011
Coastal Engineering Proceedings
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The use of different optical systems based on computer vision approach, for measuring swash zone morphological changes, is here proposed. ...
In particular, such techniques are able to achieve quite accurate 2D and 3D reconstruction of the sandy bottom in dynamic conditions under regular waves. ...
estimate of coastal vulnerability in the presence of sandy beaches also in the presence of coastal structures". ...
doi:10.9753/icce.v32.sediment.33
fatcat:dhmcnsypuzbqpki34ozs2srpr4
Physical Study on Motion and Deformation of an Aquaculture Cage Using a 2D and 3D Nonintrusive Imaging Method
2008
The Open Ocean Engineering Journal
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In the experiments, the display of a non-intrusive stereo imaging measurement of the three-dimensional net geometry was established by tracing the positions of the LED markers on the cage net. ...
The purpose of this study was to solve a fluid-structure coupling problem with the aim of optimizing aquaculture cage design and construction using laboratory observation. ...
ACKNOWLEDGEMENTS Funding for this research was provided by the NCKU-NSYSU Research Center of Ocean Environment and Technology through the research program "Improvement Study on The Structure of Marine ...
doi:10.2174/1874835x00801010021
fatcat:l3dwt4xidzan3ebcjmszf6hqwm
3-D Monitoring Of Rubble Mound Breakwater Damages
2017
Zenodo
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One of the additional advantages of using RGB-D cameras is the possibility to obtain measurements also in the presence of water. ...
In this paper, we propose an aordable yet accurate fully automated method based on 3D cameras. ...
Acknowledgements This work has been partly funded by the European Commission, project HYDRALAB PLUS (contract no. 654110). ...
doi:10.5281/zenodo.1319329
fatcat:xspxvs3yjjeoherwkxzxbtu6we
IMAGE-BASED RECONSTRUCTION AND ANALYSIS OF DYNAMIC SCENES IN A LANDSLIDE SIMULATION FACILITY
2017
ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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The application of image processing and photogrammetric techniques to dynamic reconstruction of landslide simulations in a scaled-down facility is described. ...
On one side, using a multi-view sensor set up based on four synchronized GoPro 4 Black<sup>®</sup> cameras, a 4D (3D spatial position and time) reconstruction of the dynamic scene is obtained through the ...
ACKNOWLEDGEMENTS First of all, acknowledgements are due to all people who, at different degree, have been involved in the experiment preparation, running and processing: Dr Diego Arosio, Davide Brambilla ...
doi:10.5194/isprs-annals-iv-5-w1-63-2017
fatcat:ko2csyavjzfz3ktidc4vfnmdtq
Image-Based Measurement of Wave Interactions with Rubble Mound Breakwaters
2020
Journal of Marine Science and Engineering
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A growing number of studies have demonstrated applications in coastal and ocean research. ...
In this paper, an alternative method for tracking water surface, based on color segmentation, is presented. ...
The authors found that using a total of 30-50 tracked points along the lines separated by equal intervals of 1-2 pixels, yielded the best results. ...
doi:10.3390/jmse8060472
fatcat:aawk6afjjzgddco4jmprrfgyxm
Noninvasive microtomographic inspection of rough surfaces by active triangulation
2001
Laser Metrology for Precision Measurement and Inspection in Industry
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The 3D detection is done by a stereo vision system where the cameras were calibrated using the DLT-11 method. ...
A stereo vision system was implemented in Matlab using two identical webcams placed in parallel geometry. ...
Local Information GUANAJUATO Declared a World Heritage Site by UNESCO in 1988, the city of Guanajuato is one of Mexico's most visited spots. ...
doi:10.1117/12.439209
fatcat:kc3xahntybhg5cyygebalmq7qa
Shoaling of an Internal Wave Packet in an almost Three-Layer Sea over a Steep Shelf
Rasprostraneniye paketa vnutrennikh voln v pochti trekhsloynom more nad krutym shel'fom
2021
Ekologicheskaya bezopasnost pribrezhnoy i shel fovoy zon morya
Rasprostraneniye paketa vnutrennikh voln v pochti trekhsloynom more nad krutym shel'fom
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In this paper, ripple height and length are studied at equilibrium state in a current flume. The impact of the grain size and grain shape are analysed. ...
Sand ripples have been the subject of many studies. Numerous empirical formulas exist to describe their dimensions. ...
We thank the relevant authorities (WSA Bremerhaven) for providing data on Weser bathymetry. ...
doi:10.22449/2413-5577-2021-4-5-26
fatcat:zg7k7t5ydnauzhw2vnob3n5nla
Monitoring of brake performance in service of hoisting machinery
[chapter]
2015
Structural Health Monitoring and Integrity Management
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No part of this publication or the information contained herein may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, by photocopying, recording ...
or persons as a result of operation or use of this publication and/or the information contained herein. ...
Acknowledgements On behalf of the organizing committee, we would like to thank the co-organizer and the supporting organizations. ...
doi:10.1201/b18510-114
fatcat:bgnhb2xxqbaojoujeal66tnrru
Design of an endoscopic 3-D Particle-Tracking Velocimetry system and its application in flow measurements within a gravel layer
2005
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In the next chapter, we will describe the unique way in which water has broken through the dam and escaped our attempts to understand it. ON PHYSICS (1964) RICHARD P. FEYNMAN, THE FEYNMAN LECTURES ...
The behaviour of fluids is in many ways very unexpected and interesting (...). ...
stereo rig (see section 6.2.2 for the reconstruction method). ...
doi:10.11588/heidok.00005961
fatcat:6qyahazp3zggppyiubkt7zxjdm
Trends in preference, programming and design of concert halls for symphonic music
2008
Journal of the Acoustical Society of America
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The biofilm consisted of Streptococcus mutans, a common oral bacterium, grown on a glass slide and observed under magnification to be both thinly coating the glass surface and clustered in larger colonies ...
A new approach reconstructs the spatial distribution of sound pressure and particle velocity based on the inverse finite element ͑FE͒ method. ...
Therefore, the conventional design method, based on equivalent mass, is inapplicable. In this paper, a design method based on the mobility of the structure is proposed. ...
doi:10.1121/1.2932471
fatcat:hhka5ml2fvcszklkzau2lw3gka
The structural acoustic properties of stiffened shells
2008
Journal of the Acoustical Society of America
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Many studies have documented changes in behavior as a function of exposure, but it has proven difficult to relate these to effects on the welfare of individual animals or on the status of populations. ...
Effects of sound on marine mammals have traditionally been defined either as injury or disruption of behavior. ...
The biofilm consisted of Streptococcus mutans, a common oral bacterium, grown on a glass slide and observed under magnification to be both thinly coating the glass surface and clustered in larger colonies ...
doi:10.1121/1.2932806
fatcat:zohbewf2k5h7fly2hoqzfdk42e
Design and Implementation of a Passive Stereo-Infrared Imaging System for the Surface Reconstruction of Water Waves
2004
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Previous work on water wave imaging is reviewed and the major problems with stereo-based reconstruction of water surfaces are identified: transparency, lack of texture and specular reflections. ...
A description of the stereo infrared camera system used in this work is given. An experimental validation of the system was performed at the Heidelberg wind-wave channel. ...
Bernd Jähne for giving me the opportunity to work on this interesting topic. Kurt Roth for acting as the second referee. Richard Hartley, for the opportunity to do part of this work in Canberra. ...
doi:10.11588/heidok.00004601
fatcat:swcw6ozd55bxxh24egai7yvnui
Acoustic GIS‐based monitoring of Atlantic cod ecosystems in coastal Newfoundland
2008
Journal of the Acoustical Society of America
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Many studies have documented changes in behavior as a function of exposure, but it has proven difficult to relate these to effects on the welfare of individual animals or on the status of populations. ...
Effects of sound on marine mammals have traditionally been defined either as injury or disruption of behavior. ...
The biofilm consisted of Streptococcus mutans, a common oral bacterium, grown on a glass slide and observed under magnification to be both thinly coating the glass surface and clustered in larger colonies ...
doi:10.1121/1.2932540
fatcat:v6w3j7upx5duhkunch6oai5jve
Relevance of time‐varying properties of the first formant frequency in vowel representation
1985
Journal of the Acoustical Society of America
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This is a review of recent experimental and theoretical studies of the influences of the sea surface on the transmission of airborne sound into the ocean. ...
A comparison between present results and those quoted in other studies indicates that this method produces reliable resuits. ...
Three-dimensional audio image reconstruction.
progressively in the hop phase. [Work supported by NSF.] 11:00 EES. Ultrasonic studies of metallic glasses at low temporatures. C. ...
doi:10.1121/1.2023018
fatcat:3lbckbce2rglzj7zx3fp4nhiui
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