Yes and no......the standard cameras used are not optically precise enough, nor do they run at a sufficient frame rate to accurately determine when a ball leaves a foot, the technology exists, but it would be too expensive to use. Also note the thickness of the line used on the monitor (which is so we can see it) if scaled back to the pitch would be about 2 foot wide, and so pointless to factually establish accuracy.
However your example is not quite right as all frames (analog or digital) have a unique frame count, and so if the VAR operator decides a ball leaves X's foot on frame 2541, he can roll the film forward or back, pan, track, zoom etc. to any other frame....fix the frame the player is offside (or not) and cross reference the frames....if the player is forward of any defender after frame 2541 then he must be offside....behind the defender...onside.
Responding to your first paragraph: the problem there is not that the technology is not precise enough. The problem is that reality does not consist of discrete instants. So eg kicking a ball, like everyting else, takes time. It occurs over a continuum. The more precise your technology is, in fact, the MORE possible "instants" (frames, in the case of TV cameras) that the contact between foot and ball will be spread over. So your problem of which one to choose actually gets worse. It would actually be easier if cameras only ran at 3 frames a second or something. Then there would probably only be one frame as the outstanding candidate to be the moment the ball was kicked, and you could draw your lines in that frame only. (Obvously it would be murder to watch football at that frame rate haha.)
Anyway, the point is the problem of a lack of absolute precision is not a technological problem. Or a problem of human subjectivity. Reality is a flow and so has inherent limits on the precision with which it can be measured. This is also why you have the uncertainty principle in physics. Our footballing example is essentially a variation on the same thing. (So when people say somebody is either offside or they're not, it actually depends. Most offsides, the margin is big enough that they definitely are or not. But for tight enough calls, it will actually be the case that the runner will be onside for part of the time the passer's foot is in contact with the ball, and then offside for part of the time. It will
actually be the case. So more precise technology just increases your choice of which one to pick.
Which brings us to your second paragraph:
Because there is an inherent arbitrariness and subjectivity on which frame gets picked as "the" frame,
once the official has picked a frame to be the one ,
that's the one that the lines have to be drawn in. So if he has picked frame 4561, he CAN'T, having zoomed out to see the receiving player, then start winding it forward and drawing lines in frame 4565 or whatever. If he'd picked 4565 first, yes. But he can't go "this is the one we're using", zoom out, and then go "hmm, it's not clear if he's offside in this one, I'll wind forward until he definitely is"!
« Last Edit: Dec 27, 2024 06:45:16 pm by sore monad »
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