Airborne hyperspectral detection of underwater camouflaged targets and the effect of target shape and seafloor on image
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RESEARCH ARTICLE
Airborne hyperspectral detection of underwater camouflaged targets and the effect of target shape and seafloor on image quality M. Darwiesh1 • H. S. Ayoub2 • A. F. El-Sherif1 • Y. H. Elbashar3
Received: 2 July 2020 / Accepted: 30 October 2020 Ó The Optical Society of India 2020
Abstract The goal of the present work is to increase the detectivity of hyperspectral imaging systems, deployed on airborne marine search and rescue platforms (SAR), also the increase of the probability for camouflaged target detection and recognition through optimization of image quality. Hence, water column spectral characteristics will be simulated, bringing into consideration the effect of both air layer and plankton layer. This experimental simulation is based on hyperspectral imaging of camouflaged dummy targets of different shapes in a special aquarium designed for this purpose, where an argon laser source was used as multi-spectral line target illuminator and three different bottom backgrounds were tested. Keywords Hyperspectral imaging Underwater Camouflaged targets Argon laser Image quality
Introduction Hyperspectral imaging is a technique that collects precious information from the electromagnetic spectrum. Hyperspectral imaging has the advantage to determine the material characteristics and helps in detecting the optimum material [1]. Hyperspectral imaging technique applies to
SAR operations, and it may eases target detection and minimizes time and energies [2]. When a hyperspectral imager is deployed on airborne platforms, the light source used is daylight solar electromagnetic radiations. This is case of passive remote sensing method. By using an artificial light source and lasers, a better control of the measurements is achieved which is the case of an active remote sensing method [3–11]. With multiline laser source, it is possible to perform imaging below the 1% sunlight depth. The underwater hyperspectral imager gives of a better spatial and spectral resolution of the selected objects optical imaging [12–19]. The greatest test challenge in recognizing submerged items is the utilization of airborne hyperspectral detection, and the underwater camouflaged targets effect of target shape and seafloor image quality [20–23]. The imaging setup is observing the scattered spectrum that is highly dependent on the optical properties of the surrounding environment (background–water turbidity–laser wavelength–target camouflage and depth–target detection angle) which strongly affects the target detectivity. In this work, we will shed light on the optimum spectral and geometrical parameters and their effect on imaging quality.
Experimental setup & Y. H. Elbashar [email protected] 1
Engineering Physics Department, Military Technical College, Cairo, Egypt
2
Department of Physics, Faculty of Science, Cairo University, Cairo, Egypt
3
Department of Basic Science, ELGazeera High Institute for Engineering and Technology, Cairo, Egypt
A test aquarium was built to perform and simulate different marine environm
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