POLARISED UNDERWATER IMAGING SYSTEM FOR IMPROVING VISIBILITY AND OBJECT DETECTION IN TURBID WATER

摘要

The invention relates to an underwater imaging system, which comprises: - at least one image-acquisition device, - a lighting device intended for lighting an area located at least partially inside a field of the image-acquisition device, and - an image-processing device configured to process an image (30) acquired by the image-acquisition device. The image-processing device is configured to: - calculate an average light intensity of a portion of pixels of the acquired image (30) which have the greatest light intensity (A); - apply a Gaussian low-pass filter (34) to the acquired image (30) so as to obtain a filtered image (38); - calculate, from the quotient of the image filtered by said average light intensity, a transmission map (40) of the acquired image, said transmission map representing light transmission by each of the pixels of the acquired image; and - estimate, from said transmission map (40) and from the acquired image (30), a processed image (42) in which a contribution of the backscattering of the light is removed.