Håvard Snefjellå Løvås
About
The PhD aims to develop optical techniques for hyperspectral mapping of the seabed from vehicles above and below water. The techniques mainly involve creating geometrically and radiometrically accurate maps. A consistent theme in the PhD is to use photogrammetry with ordinary cameras to build a 3D model of the terrain and to find the vehicle's movement in relation to the terrain. This lets us estimate where hyperspectral images originate on the seabed. Furthermore, such a geometric understanding of the image's formation enables us to model the light's scattering and absorption in the water column. By correcting for the effects of the water columnt, we can calculate the true reflectance of objects on the seabed. It is this reflectance that is often called the spectral fingerprint and it is used to identify different substrates. The doctorate is an interdisciplinary effort that combines techniques from radiation theory, machine vision, remote sensing.
Publications
2021
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Løvås, Håvard;
Mogstad, Aksel Alstad;
Sørensen, Asgeir Johan;
Johnsen, Geir.
(2021)
A Methodology for Consistent Georegistration in Underwater Hyperspectral Imaging.
IEEE Journal of Oceanic Engineering
Academic article
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Diamanti, Eleni;
Løvås, Håvard;
Larsen, Martin Kvisvik;
Ødegård, Øyvind.
(2021)
A multi-camera system for the integrated documentation of Underwater Cultural Heritage of high structural complexity; The case study of M/S Helma wreck.
IFAC-PapersOnLine
Academic article
Journal publications
-
Løvås, Håvard;
Mogstad, Aksel Alstad;
Sørensen, Asgeir Johan;
Johnsen, Geir.
(2021)
A Methodology for Consistent Georegistration in Underwater Hyperspectral Imaging.
IEEE Journal of Oceanic Engineering
Academic article
-
Diamanti, Eleni;
Løvås, Håvard;
Larsen, Martin Kvisvik;
Ødegård, Øyvind.
(2021)
A multi-camera system for the integrated documentation of Underwater Cultural Heritage of high structural complexity; The case study of M/S Helma wreck.
IFAC-PapersOnLine
Academic article