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Dec 4, 2022 at 5:28 history edited Franck Dernoncourt CC BY-SA 4.0
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Dec 4, 2022 at 5:27 comment added Franck Dernoncourt @MichaelKay see mobile.twitter.com/FIFAcom/status/… for the video that match officials used the goal line camera images to check whether the ball was still partially on the line.
Dec 4, 2022 at 1:30 comment added Franck Dernoncourt @MichaelKay let's ask: Are the actual lines on the ground defined by the actual white paint on the grass or by some laser beam?. "because any measuring apparatus has finite precision" true but in most cases they'll solve the pb when the human eyes can't.
Dec 4, 2022 at 1:24 comment added Michael Kay @FranckDernoncourt because any measuring apparatus has finite precision. I don't know if the actual line is defined by the white paint on the grass or by some laser beam, but either way, it's not a zero-width mathematical straight line.
Dec 4, 2022 at 1:23 comment added Franck Dernoncourt @MichaelKay Human eyes are limited. I believe some tools offer more accurate measurements.
Dec 4, 2022 at 1:19 comment added Michael Kay Incidentally, I play croquet, where this decision only has to be made for a stationary ball rather than a moving one. Yet I once had three referees spend 10 minutes examining a stationary ball and eventually deciding it was too close to call, and invoking the rule that the striker of the ball gets the benefit of the doubt.
Dec 4, 2022 at 1:17 comment added Franck Dernoncourt @MichaelKay "It doesn't prove that it was "in" a millsecond earlier or a millesecond later." True, but the FIFA doesn't like when people share videos (they send DMCA takedown requests really easily). "There are going to be situations that are undecidable": why?
Dec 4, 2022 at 1:16 comment added Michael Kay The photo shows that the ball was (just) "in" at the moment in time when the photo was taken. It doesn't prove that it was "in" a millsecond earlier or a millesecond later. The fact is, however precise your observations, there are going to be situations that are undecidable, and we then have to turn to whatever clauses in the rule book say who should get the benefit of the doubt...
Dec 3, 2022 at 15:02 comment added brhans How do we know that the top image was taken from directly overhead, above the line and perpendicular to the ground?
Dec 2, 2022 at 13:53 vote accept user366312
Dec 2, 2022 at 13:30 comment added Franck Dernoncourt @PhilipKendall agreed, the tweet only demonstrates plausibility by showing how 3D works.
Dec 2, 2022 at 13:29 comment added Philip Kendall While I think everyone agrees it was close one way or the other, I'm not sure that tweet actually shows much. You could reasonably move both the red and blue lines by their width and get a different result.
Dec 2, 2022 at 13:04 history edited Franck Dernoncourt CC BY-SA 4.0
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Dec 2, 2022 at 12:24 history edited Franck Dernoncourt CC BY-SA 4.0
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Dec 2, 2022 at 12:19 history answered Franck Dernoncourt CC BY-SA 4.0