Speaking of Google photography research (see previous post about portrait relighting), I’ve been meaning to point to the team’s collaboration with MIT & Berkeley. As PetaPixel writes,

The tech itself relies on not one, but two neural networks: one to remove “foreign” shadows that are cast by unwanted objects like a hat or a hand held up to block the sun in your eyes, and the other to soften natural facial shadows and add “a synthetic fill light” to improve the lighting ratio once the unwanted shadows have been removed.

Here’s a nice summary from Two-Minute Papers: