Retinex Filtering of Underwater Images

This is the third work of a series which is discussing the applications that a Retinex filter can have for enhancing images. In the first paper, we considered the images from microscopes. In the second, we discussed how a Retinex filtering can help us in the investigation of the motion of sand dunes. Here we give examples concerning images that can be obtained by underwater imaging devices. In particular, we consider applications to the study of underwater cultural heritage and of submerged landforms in general. The filter that we use is the GIMP Retinex, originally developed by Fabien Pelisson.