Re(2): What I really need here Posted on March 18, 2024 at 05:18:18 PM by Craig G
Thanks. There was no way I was going to assume the spacing is uniform.
And thanks to jatna77 for illustrating the old precision versus accuracy idea from back in school.
12.857142857142857142857142857143 ft long, indeed.
But seriously, my first observation was that it is a happy coincidence the the 3 serve-related lines match up perfectly with the line markers at both frontons. Their ideal placements just happen to be even multiples of the uniform section lengths. Right?
No, what is more likely is that the line markers are fudged a little to accommodate the serve lines. If you look at the Dania pic I found, the maximum variance seems to be in just those locations.
So, ideally, we would obtain actual measurements for each line, especially since there is perspective-related distortion as we go from the center outward.
Just as a prelim guess, it looks like the max variance of the lines is about 12%.
I also see that the technology is to the point that you can get a 120 fps camera for about $300, like the DJI Osmo Action 4, which is said to do well in low light levels. If true, then you wouldn't need expensive equipment to make some high quality assessments of what is actually going on with the pelota. That frame rate gets the 100 mph case down to about 1 foot of displacement per frame. More than adequate for these calculations.
