Space-time ocean wave measurement using variational stereo vision systems

Gallego Bonet, Guillermo and Shih, Ping-Chang and Benetazzo, Alvise and Yezzi, Anthony and Fedele, Francesco (2014). Space-time ocean wave measurement using variational stereo vision systems. In: "Waves In Shallow water Environments (WISE)", 08-12 June 2014, ECMWF, Reading, United Kingdom.

Description

Title: Space-time ocean wave measurement using variational stereo vision systems
Author/s:
  • Gallego Bonet, Guillermo
  • Shih, Ping-Chang
  • Benetazzo, Alvise
  • Yezzi, Anthony
  • Fedele, Francesco
Item Type: Presentation at Congress or Conference (Speech)
Event Title: Waves In Shallow water Environments (WISE)
Event Dates: 08-12 June 2014
Event Location: ECMWF, Reading, United Kingdom
Title of Book: Waves In Shallow water Environments (WISE)
Date: 12 June 2014
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Señales, Sistemas y Radiocomunicaciones
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Remote sensing imaging systems for the measurement of oceanic sea states have recently attracted renovated attention. Imaging technology is economical, non-invasive and enables a better understanding of the space-time dynamics of ocean waves over an area rather than at selected point locations of previous monitoring methods (buoys, wave gauges, etc.). We present recent progress in space-time measurement of ocean waves using stereo vision systems on offshore platforms. Both traditional disparity-based systems and modern elevation-based ones are presented in a variational optimization framework: the main idea is to pose the stereoscopic reconstruction problem of the surface of the ocean in a variational setting and design an energy functional whose minimizer is the desired temporal sequence of wave heights. The functional combines photometric observations as well as spatial and temporal smoothness priors. Disparity methods estimate the disparity between images as an intermediate step toward retrieving the depth of the waves with respect to the cameras, whereas elevation methods estimate the ocean surface displacements directly in 3-D space. Both techniques are used to measure ocean waves from real data collected at offshore platforms in the Black Sea (Crimean Peninsula, Ukraine) and the Northern Adriatic Sea (Venice coast, Italy). Then, the statistical and spectral properties of the resulting observed waves are analyzed. We show the advantages and disadvantages of the presented stereo vision systems and discuss the improvement of their performance in critical issues such as the robustness of the camera calibration in spite of undesired variations of the camera parameters.

More information

Item ID: 29907
DC Identifier: http://oa.upm.es/29907/
OAI Identifier: oai:oa.upm.es:29907
Deposited by: Dr Guillermo Gallego Bonet
Deposited on: 17 Jun 2014 05:41
Last Modified: 22 Apr 2016 00:15
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