How to take a picture of a black hole?

Katie Bouman designs algorithms to visualize a first real picture of a black hole.
We have seen some black hole's images in some movies but it's not a real picture.
Any black holes haven't still directly observed because there are too far away from the Earth.
If we take a picture of it, we need a Earth-size telescope.
The Event Horizon Telescope starting 2017 is a project connecting many telescopes around the world instead of building a Earth-size telescope.
They harnesses Earth rotation to fill some blanks of images taken by worldwide telescopes.
Katie is a member of it.
She designs algorithms to reconstruct reasonable images from noisy data.
She ranks a bunch of pictures to find which is most likely.
But, how can we evaluate data however reasonable even if we have never seen black holes?
They divide pictures like puzzle pieces and reconstruct them.   

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