Botworld
I want to dig into this, not to explain how it works, but just to get across the sheer amount of sheer that’s going on here.
There an app on the iPhone that just does this Sudoku recognition thing, an app called Sudoku Grab and the author of the app very helpfully explains how it works. There’s a whole bunch of complicated code going on here.
This is the original photo, okay we get that.
[Information and image sources: How Sudoku Grab works, by the app author.]