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Title: A holographic system for subsea recording and analysis of plankton and other marine particles
Authors: Watson, J
Alexander, S
Chalvidan, V
Craig, G
Diard, A
Foresti, GL
Gentili, S
Hendry, DC
Hobson, PR
Lampitt, RS
Nareid, H
Nebrensky, JJ
Pescetto, A
Pieroni, GG
Player, MA
Saw, K
Serpico, S
Tipping, K
Trucco, A
Issue Date: 2003
Publisher: IEEE
Citation: OCEANS 2003. San Diego, September 2003. 830 - 837.
Abstract: We report here details of the design, development, initial testing and field-deployment of the HOLOMAR system for in-situ subsea holography and analysis of marine plankton and nonliving particles. HOLOMAR comprises a submersible holographic camera ("HoloCam") able to record in-line and off-axis holograms at depths down to 100 m, together with specialised reconstruction hardware ("HoloScan") linked to custom image processing and classification software. The HoloCam consists of a laser and power supply, holographic recording optics and holographic plate holders, a water-tight housing and a support frame. It utilises two basic holographic geometries, in-line and off-axis such that a wide range of species, sizes and concentrations can be recorded. After holograms have been recorded and processed they are reconstructed in full three-dimensional detail in air in a dedicated replay facility. A computer-controlled microscope, using video cameras to record the image at a given depth, is used to digitise the scene. Specially written software extracts a binarised image of an object in its true focal plane and is classified using a neural network. The HoloCam was deployed on two separate cruises in a Scottish sea loch (Loch Etive) to a depth of 100 m and over 300 holograms were recorded.
ISBN: 0-933957-30-0
Appears in Collections:Electronic and Computer Engineering
Dept of Electronic and Computer Engineering Research Papers

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