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Pool Table with Projector
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ChadTower:
ids:
Chazz - I think it could be done with software and a camera, like a decently res'd webcam or the like.  Start with a plain pic of the table with no balls - call this the default img.  Then compare current image from cam vs. default+projected image.  The difference will expose any changes, such as balls on the table.  Do a bit of noise reduction and such so as not to overreact to small things.  Bob is likely your uncle at this point.
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