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Shallow waters are very important for human and biological activity. Remote sensing of these areas is challenging, as it requires separation of ocean (or lake) bottom, water and atmospheric effects. In this paper we describe a concept and theory for spaceborne recovery of the underwater depth map, optical characteristics of the water and atmosphere, and the descattered ocean bottom. The sensing is...
Video extrapolation is the task of extending a video beyond its original field of view. Extrapolating video in a manner that is consistent with the original video and visually pleasing is difficult. In this work we aim at very wide video extrapolation which increases the complexity of the task. Some video extrapolation methods simplify the task by using a rough color extrapolation. A recent approach...
Binocular stereo vision is a common technique for the recovery of three-dimensional shape. Underwater, backscatter degrades the image quality and consequently the performance of stereo vision-based 3-D reconstruction techniques. Recently, we proposed a method that exploits the depth cue in the backscatter components of stereo pairs, as an additional constraint for recovering the 3-D scene structure...
Computer vision is challenged by the underwater environment. Poor visibility, geometrical distortions and non-uniform illumination typically make underwater vision less trivial than open air vision. One effect which can be rather strong in this domain is sunlight flicker. Here, submerged objects and the water volume itself are illuminated in a natural random pattern, which is spatially and temporally...
Pointwise image formation models appear in a variety of computational vision and photography problems. Prior studies aim to recover visibility or reflectance under the effects of specular or indirect reflections, additive scattering, radiance attenuation in haze and flash, etc. This work considers bounds to recovery from pointwise degradation. The analysis uses a physical model for the acquired signal...
Stray light reflected by lens surfaces creates flare which affects the image. A pronounced form of this flare is aperture ghosting, where bright spots that resemble the shape of the lens aperture are overlayed on the image. This might disrupt image analysis. It occurs when a bright narrow source (usually the Sun) is in the vicinity of the field of view, though often the source may be outside the actual...
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