I’ve often thought that some technology that allows you to replace balls exactly in the position they were would be useful. Like if you miss a shot or position you could replace the balls exactly where they were and try it again after the match. I mean you can try that from memory, but being off just an inch or two can materially change the shot.
I've seen camera technology that could replace balls within less than a millimeter but it was expensive, including cameras on tracks over the table. I think the OP is planning on using the camera in your phone.
For an intermediate solution, see the system on eddiwins.com
