A few years ago I solved a computer vision problem involving getting the spin of a golf ball as it came off the tee; a fuzzy image of a ball going up to 150mph.

A few years ago I solved a computer vision problem involving getting the spin of a golf ball as it came off the tee; a fuzzy image of a ball going up to 150mph. Because the client didn’t have a have a system that could truly “freeze” the ball (“make it work with our crappy images”) I had jump through a lot of hoops to get an accurate spin. In the end I was getting rotational accuracy of around 1/2 a degree I think. I remember calculating that it was 1/2 the thickness of a credit card as measured on the surface of the ball.