Space-time ocean wave measurement using variational stereo vision systems

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


Título: Space-time ocean wave measurement using variational stereo vision systems
  • Gallego Bonet, Guillermo
  • Shih, Ping-Chang
  • Benetazzo, Alvise
  • Yezzi, Anthony
  • Fedele, Francesco
Tipo de Documento: Ponencia en Congreso o Jornada (Charla)
Título del Evento: Waves In Shallow water Environments (WISE)
Fechas del Evento: 08-12 June 2014
Lugar del Evento: ECMWF, Reading, United Kingdom
Título del Libro: Waves In Shallow water Environments (WISE)
Fecha: 12 Junio 2014
Escuela: E.T.S.I. Telecomunicación (UPM)
Departamento: Señales, Sistemas y Radiocomunicaciones
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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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.

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ID de Registro: 29907
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Depositado por: Dr Guillermo Gallego Bonet
Depositado el: 17 Jun 2014 05:41
Ultima Modificación: 22 Abr 2016 00:15
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