Sea-thru Brings Clarity to Underwater Photos

#imagerie_numerique (déjà utilisé dans le spatial… pour les photos marsiennes) #gamut

Utilisé pour l’étalonnage des films, la télévision etc depuis l’#ortf, mais bon, ça fait bien de dire algorithme … #balance_colorimétrique #mire_de_barres

https://iletaitunefoislatele.files.wordpress.com/2012/11/mireduexiemechaine.jpg https://jallume.files.wordpress.com/2010/09/mire.jpg

je ne pense pas que c’est aussi simple que ça ...
faut voir la vidéo où elle explique comment elle fait ; ça nécessite plein de prises de photos à diverses distances

One caveat is that the process requires distance information to work. Akkaynak takes numerous photographs of the same scene from various angles, which Sea-thru uses to estimate the distance between the camera and objects in the scene—and, in turn, the water’s light-attenuating impact. Luckily, many scientists already capture distance information in image data sets by using a process called photogrammetry, and Akkaynak says the program will readily work on those photographs.

[...]

The algorithm differs from applications such as Photoshop, with which users can artificially enhance underwater images by uniformly pumping up reds or yellows. “What I like about this approach is that it’s really about obtaining true colors,” says Pim Bongaerts, a coral biologist at the California Academy of Sciences. “Getting true color could really help us get a lot more worth out of our current data sets.

Mire photographique.