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http://bura.brunel.ac.uk/handle/2438/2580
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. |
URI: | http://bura.brunel.ac.uk/handle/2438/2580 |
DOI: | http://dx.doi.org/10.1109/OCEANS.2003.1283387 |
ISBN: | 0-933957-30-0 |
Appears in Collections: | Electronic and Electrical Engineering Dept of Electronic and Electrical Engineering Research Papers |
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A holographic system for subsea recording and analysis of plankton and other marine particles.pdf | 712.35 kB | Adobe PDF | View/Open |
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