Quote:
Originally Posted by utack
Same frame with (from libaom) and without grain (from dav1d)
http://screenshotcomparison.com/comparison/122531
Biggest difference is in the river if you ask me
It is probably even more important when pushing the bitrate even lower in a scene like this |
Good example. And also a good illustration of the challenges with film grain removal. The degrained version also took out the ripples from the water, which were NOT grain. Small details that move stochastically can be very hard to discriminate from grain. It requires some flavor of bidirectional optical flow analysis. Turbulence can be a lot like grain mathematically, but not at all visually.