Georges R. Fournier's research while affiliated with Office of Naval Research and other places

Publications (4)

Article
Full-text available
Field observations and theoretical studies have found that the volume scattering functions (VSFs) of oceanic particles exhibit minimum variability at angles near 120°. However, its physical interpretation is still unknown. We find this minimum variability angle represents the intersection of two backscattering-normalized VSFs, one representing part...
Article
Full-text available
The main challenge working with underwater imagery results from both rapid decay of signals due to absorption, which leads to poor signal to noise returns, and the blurring caused by strong scattering by the water itself and constituents within, especially particulates. The modulation transfer function (MTF) of an optical system gives the detailed...
Conference Paper
Full-text available
The presented effort is aimed at establishing a framework in order to restore underwater imagery to the best possible level, working with both simulated and field measured data. Under this framework, the traditional image restoration approach is extended by incorporating underwater optical properties into the system response function, specifically...
Article
Full-text available
We present preliminary results from recent test of the LUCIE 2 (Laser Underwater Camera Image Enhancer) conducted in Halifax Harbour, Nova Scotia, Canada. LUCIE 2 is a near compact laser range gated camera (25 cm in diameter, 70 cm in length, and neutrally buoyant in water) originally designed to decrease search and recovery operations under eye sa...

Citations

... The depth variations in P 11 at 120°in two sites are shown in Figure 3A. A nearly universal relationship exists between P 11 (120°) and the particulate backscattering coefficient (b bp , m −1 ) based on the global measurements (Sullivan and Twardowski, 2009; and theoretical studies Zhang et al., 2017). Therefore, P 11 (120°) can be used as a proxy of b bp . ...
... Due to the absorption, scattering and turbulence effects depending on the various parameters and constituents such as planktons, chlorophyl concentration, temperature and salinity, the overall performance of the optical imaging systems degrades in terms of signal attenuation color degradation, blurring and image jitter. The performance of the optical imaging systems from absorption and scattering perspective was investigated in various studies [1][2][3]. The modulation transfer function (MTF) of an optical imaging system was introduced for short-exposure and long-exposure cases by Fried [4] following his research on wavefront correction and phase decomposition in Kolmogorov turbulence spectrum. ...
... The figures in this paper were produced with η = 1. The minimization needed in last eqn can be productively approximated utilizing a current chart cut minimization algorithm [12][13][14]. The beneath figures shows the first picture and a dehazed picture. ...