[dharma1]

i thought about that too - i think the background is simply a mirror image of the foreground, and that the object 3d shape is symmetrical

[EGreg]

apparently they are using some other algorithm to do this - even more impressive!

however, it seems strange in the first example how mountain ranges appear where none were before... how did the algos know to put it there?

[abrichr]

This is the PatchMatch algorithm:

http://gfx.cs.princeton.edu/pubs/Barnes_2009_PAR/