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Proceedings Paper

The development of a subsea holographic camera for the imaging and analysis of marine organisms
Author(s): John Watson
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Paper Abstract

In this overview of the entire HoloMar system, we describe the design, development and field deployment of the fully-functioning, prototype, underwater holographic camera (HoloCam) followed by the dedicated replay facility (HoloScan) and the associated image processing and extraction of data from the holograms. 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 incorporates 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 thay 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 digitize the scene. Specially developed software extracts a binarized image of an object in its true focal plane and is classified using a neural network. The HoloCam was deployed on separate cruises in a Scottish sea loch (Loch Etive) to a depth of 100 m and over 300 holograms recorded.

Paper Details

Date Published: 4 June 2004
PDF: 9 pages
Proc. SPIE 5477, Sixth International Conference on Correlation Optics, (4 June 2004); doi: 10.1117/12.560198
Show Author Affiliations
John Watson, Univ. of Aberdeen (United Kingdom)

Published in SPIE Proceedings Vol. 5477:
Sixth International Conference on Correlation Optics
Oleg V. Angelsky, Editor(s)

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