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|Title: ||Area Estimation of Deep-Sea Surfaces from Oblique Still Images|
|Authors: ||Dias, Frederico|
|Editors: ||Coles, Jonathan A|
|Issue Date: ||2015|
|Publisher: ||Plos One|
|Citation: ||Dias FC, Gomes-Pereira J, Tojeira I, Souto
M, Afonso A, Calado A, et al. (2015) Area Estimation
of Deep-Sea Surfaces from Oblique Still Images.
PLoS ONE 10(7): e0133290. doi:10.1371/journal.
|Abstract: ||Estimating the area of seabed surfaces from pictures or videos is an important problem in
seafloor surveys. This task is complex to achieve with moving platforms such as submersibles,
towed or remotely operated vehicles (ROV), where the recording camera is typically
not static and provides an oblique view of the seafloor. A new method for obtaining seabed
surface area estimates is presented here, using the classical set up of two laser devices
fixed to the ROV frame projecting two parallel lines over the seabed. By combining lengths
measured directly from the image containing the laser lines, the area of seabed surfaces is
estimated, as well as the camera’s distance to the seabed, pan and tilt angles. The only
parameters required are the distance between the parallel laser lines and the camera’s horizontal
and vertical angles of view. The method was validated with a controlled in situ experiment
using a deep-sea ROV, yielding an area estimate error of 1.5%. Further applications
and generalizations of the method are discussed, with emphasis on deep-sea applications.|
|Appears in Collections:||CGE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
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