AN UNDERWATER LIGHT INTENSITY METER

Light as an information carrier underwater

Light is a source of both energy and information for the biota. The spatial, temporal and spectral variability of light experienced by marine phytoplankton differs significantly from that experienced by terrestrial plants, due to the selective attenuation of solar irradiance in the aquatic medium. In the present study we analysed such variability and focused, in particular, on those bands withi...

The underwater light field

Measurement of stray light and glare: comparison of Nyktotest, Mesotest, stray light meter, and computer implemented stray light meter.

AIM To evaluate the properties of devices for measuring stray light and glare: the Nyktotest, Mesotest, "conventional" stray light meter and a new, computer implemented version of the stray light meter. METHODS 112 subjects, divided in three groups: (1) young subjects without any eye disease; (2) elderly subjects without any eye disease, and (3) subjects with (early) cataract in at least one ...

An underwater light attenuation scheme for marine ecosystem models.

Simulation of underwater light is essential for modeling marine ecosystems. A new model of underwater light attenuation is presented and compared with previous models. In situ data collected in Monterey Bay, CA. during September 2006 are used for validation. It is demonstrated that while the new light model is computationally simple and efficient it maintains accuracy and flexibility. When this...

An Intensity Similarity Measure in Low-Light Conditions

In low-light conditions, it is known that Poisson noise and quantization noise become dominant sources of noise. While intensity difference is usually measured by Euclidean distance, it often breaks down due to an unnegligible amount of uncertainty in observations caused by noise. In this paper, we develop a new noise model based upon Poisson noise and quantization noise. We then propose a new ...