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On-line Filtering of Sunlight Caustic Waves in Underwater Scenes in Motion

Emanuel Trabes, Mario Jordán
In this work we address the problem of re-
moving sunlight caustic waves in underwater imagery ob-
tained by a monocular camera in motion in shallow water.
A heuristics for filter design is developed, from which es-
sential properties of the wavy water surface are exploited.
The method employs optical flow techniques and curvature
predictions of pixel traces during the motion. The result is
a practically clean image which is much more coherent with
the optical flow corresponding to the scene motion. Design
parameters are presented and guidelines to appropriately
tune them are given. The performance of the algorithm is
demonstrated in many case-studies involving synthetic video
sequences as well as film material of real subaquatic scenar-
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