I cannot believe I am actually doing this.
In the fourth set of the final, a Nadal 'winner' was decided to be that. Because, Rafa challenged the call otherwise. A review by the Hawkeye System predictably left Federer agitated. So was I. For twin reasons. As a Fed fan first and secondly, as someone who worked for Hawkeye a while, I cannot believe it is being used to judge such line calls.
1. The spatial analysis does not result in an absolutely error free result for the x1, y1 of the ball at time time t1. This is just for camera 1. There are at least 6 cameras and the error simply gets added with each camera.
2. Secondly, the system's output gives a graphic. This simulates the ball at a pre-determined size. Which, at the time I was working, looked to be the most logical thing to do. Especially since I was working on the cricket software and the game was played with a hard ball. Now, when one determines the size of the ball and uses it to determine line calls in a Tennis match, it's plain ridiculous. Well, I did not realize it was when I was at it -- since the approximation appeared natural. But watching the game reminds you -- the tennis ball does not keep its full size on impact. It is a soft ball. To extrapolate it to its full size, on top of error 1 and then decide line calls, in Wimbledon finals, is stupid. I have no other word for it.
3. All this would have still worked fine had the laws of the game not been so idiotic to say -- even a nanometer of the line being caught by ball is good enough. That's a margin the system can't handle. In my experience, 15% of the ball size would be possible. But that is for a hard ball. For a soft ball, leave it to the line umpire.
4. Sorry Paul.