The development of a subsea holographic camera for the imaging and analysis of marine organisms

John Watson

doi:10.1117/12.560198

4 June 2004 The development of a subsea holographic camera for the imaging and analysis of marine organisms

John Watson

Proceedings Volume 5477, Sixth International Conference on Correlation Optics; (2004) https://doi.org/10.1117/12.560198
Event: Sixth International Conference on Correlation Optics, 2003, Chernivsti, Ukraine

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.

Citation Download Citation

John Watson "The development of a subsea holographic camera for the imaging and analysis of marine organisms", Proc. SPIE 5477, Sixth International Conference on Correlation Optics, (4 June 2004); https://doi.org/10.1117/12.560198

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