title: A comparative analysis between active and passive techniques for underwater 3D reconstruction of close-range objects.
abstract: In some application fields, such as underwater archaeology or marine biology, there is the need to collect three-dimensional, close-range data from objects that cannot be removed from their site. In particular, 3D imaging techniques are widely employed for close-range acquisitions in underwater environment. In this work we have compared in water two 3D imaging techniques based on active and passive approaches, respectively, and whole-field acquisition. The comparison is performed under poor visibility conditions, produced in the laboratory by suspending different quantities of clay in a water tank. For a fair comparison, a stereo configuration has been adopted for both the techniques, using the same setup, working distance, calibration, and objects. At the moment, the proposed setup is not suitable for real world applications, but it allowed us to conduct a preliminary analysis on the performances of the two techniques and to understand their capability to acquire 3D points in presence of turbidity. The performances have been evaluated in terms of accuracy and density of the acquired 3D points. Our results can be used as a reference for further comparisons in the analysis of other 3D techniques and algorithms.
authors: Department of Mechanical Engineering, University of Calabria, Cosenza 87036, Italy. gianfranco.bianco@unical.it
authors: Gianfranco
authors: G
authors: Bianco
authors: Alessandro
authors: A
authors: Gallo
authors: Fabio
authors: F
authors: Bruno
authors: Maurizio
authors: M
authors: Muzzupappa
mesh_terms: D000465:Algorithms; D016477:Artifacts; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007101:Immersion; D011825:Radar; D014867:Water
chemical_list: D014867:Water
references: Appl Opt. 2001 Nov 20;40(33):5991-6004
references: 18364894
references: IEEE Trans Pattern Anal Mach Intell. 2010 Aug;32(8):1362-76
references: 20558871
references: IEEE Trans Pattern Anal Mach Intell. 2012 Jan;34(1):51-65
references: 21576744
references: Appl Opt. 2012 Nov 1;51(31):7591-603
references: 23128708