4 ms·
They actually correct by using wavelength-dependent Backscatter and attenuation models while accounting for camera spectral sensitivities and illuminant spectru
by kelsolaar 7y ago
They actually correct by using wavelength-dependent Backscatter and attenuation models while accounting for camera spectral sensitivities and illuminant spectrum. This is much more complex than "just color fixing".
The publication shows that it is not a simple colour correction: http://openaccess.thecvf.com/content_CVPR_2019/papers/Akkaynak_Sea-Thru_A_Method_for_Removing_Water_From_Underwater_Images_CVPR_2019_paper.pdf http://openaccess.thecvf.com/content_CVPR_2019/papers/Akkayn...
- elhudy 7y agoIt might not be "just color fixing", but to my eye at least, the results appear similar to if you were to simlpy white balance in lightroom (which doesn't always require a color chart either). Example: https://imgur.com/a/h3uFu4z https://imgur.com/a/h3uFu4z
- jrpt 7y agoIt's clearly much better than that. The problem is that, in a medium like water, light of different wavelengths absorb differently. So the longer distance the light travels through water, the more the effect is, and this effect is different depending on the wavelength. So you can't just open Photoshop and change the color levels of everything in the picture simultaneously. You actually have to know/estimate distances to different objects and make adjustments locally based on that.
- elhudy 7y agoI'm aware how water affects light underwater; I do scuba photography. I'm sorry, but it's simply not "clearly much better than that". It's a lot of effort for very little, if any, visible difference.