Observatorio de I+D+i UPM

Memorias de investigación
Ponencias en congresos:
Improving 3-D variational stereo reconstruction of oceanic sea states by camera calibration refinement
Áreas de investigación
  • Procesado y análisis de la señal
Studies of wave climate, extreme ocean events, turbulence, and the energy dissipation of breaking and non-breaking waves are closely related to the measurements of the ocean surface. To gauge and analyze ocean waves on a computer, we reconstruct their 3-D model by utilizing the concepts of stereoscopic reconstruction and variational optimization. This technique requires a pair of calibrated cameras?cameras whose parameters are estimated for the mathematical projection model from space to an image plane?to take videos of the ocean surface as input. However, the accuracy of camera parameters, including the orientations and the positions of cameras as well as the internal specifications of optics elements, are subject to environmental factors and manual calibration errors. Because the errors of camera parameters magnify the errors of the 3-D reconstruction after projection, we propose a novel algorithm that refines camera parameters, thereby improving the accuracy of variational 3-D reconstruction. We design a multivariate error function that represents discrepancies between captured images and the reprojection of the reconstruction onto the images. As a result of the iteratively diminished error function, the camera parameters and the reconstruction of ocean waves evolve to optimal values. We demonstrate the success of our algorithm by comparing the reconstruction results with the refinement procedure to those without it and show improvements in the statistics and spectrum of the wave reconstruction after the refinement procedure.
Nombre congreso
International Conference on Offshore Mechanics and Arctic Engineering (OMAE)
Tipo de participación
Lugar del congreso
Nantes, France
Fecha inicio congreso
Fecha fin congreso
Desde la página
Hasta la página
Título de las actas
Improving 3-D variational stereo reconstruction of oceanic sea states by camera calibration refinement
Esta actividad pertenece a memorias de investigación
  • Autor: Ping-Chang Shih (Georgia Institute of Technology)
  • Autor: Guillermo Gallego Bonet (UPM)
  • Autor: Anthony Yezzi (Georgia Institute of Technology)
  • Autor: Francesco Fedele (Georgia Institute of Technology)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Grupo de Tratamiento de Imágenes (GTI)
  • Departamento: Señales, Sistemas y Radiocomunicaciones
S2i 2021 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)