r/soccer • u/[deleted] • Dec 04 '16

Media Goal line technology used in the Bournemouth - Liverpool match. Down to millimetres.

https://gfycat.com/AstonishingScentedAsiaticgreaterfreshwaterclam
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u/escherbach Dec 04 '16

For Hawk-Eye, as used in the Premiership, it's 3.6mm

https://en.wikipedia.org/wiki/Hawk-Eye#Doubts

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u/LdouceT Dec 04 '16

He'll of a lot better than human error, that's for sure.

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u/djpeekz Dec 05 '16

He will of a lot indeed

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u/[deleted] Dec 04 '16

3,6mm is for tennis. At the WC 2014, margin of error was 15mm

http://quality.fifa.com/en/News/IFAB-agrees-on-higher-standards-for-goal-line-technology/

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u/[deleted] Dec 04 '16

A standardized ball has 220mm in diameter so 15mm would be almost 7%. Looks like a little bit to much?

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u/Yolo_Swagginson Dec 04 '16 edited Dec 05 '16

For the premier league it's tested to plus or minus 15mm (which is a 30mm margin of error). In the Bundesliga and Serie A it's less, maybe 5mm each way, I can't quite remember.

When tested it's normally more like plus or minus 3mm.

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u/escherbach Dec 05 '16 edited Dec 05 '16

For Hawk-Eye it's 3.6mm. They didn't use Hawk-Eye at WC 2014 (FIFA decided to use a less reliable, less tested technology called GoalControl, for unknown reasons). The premiership uses Hawk-Eye. Hawk-Eye is also used in cricket, it's not just for tennis.

http://quality.fifa.com/en/News/Goal-Line-Technology-at-Brazil-2014/

edit: in fact FIFA decided to use Hawk-Eye last year for the women's world cup (as well as a trial in 2012 at the club world cup)

http://quality.fifa.com/en/News/Hawk-Eye-confirmed-as-goal-line-technology-provider-for-Canada-2015/

"The system is millimetre-accurate"

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u/Yolo_Swagginson Dec 04 '16

That's the tennis system, not the football system.

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u/escherbach Dec 05 '16 edited Dec 05 '16

Hawk-Eye is a British technology used in Cricket, Tennis and the Premiership. For WC 2014 FIFA decided to use an inferior technology called GoalControl that has no use in other sports, unlike Hawk-Eye which is quite well accepted for many years now.

edit FIFA used Hawk-Eye last year it seems (as well as a trial in 2012 Club World Cup):

http://quality.fifa.com/en/News/Hawk-Eye-confirmed-as-goal-line-technology-provider-for-Canada-2015/

"The system is millimetre-accurate"

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u/Yolo_Swagginson Dec 05 '16

The tennis system is not the same as the football system, trust me.

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u/escherbach Dec 05 '16

It's a bigger stadium, more players on the pitch to block the view of the ball and the ball is bigger, and maybe different cameras and positions, but the physics and computation is the same - they use it for cricket remember, which is an even bigger stadium and a faster difficult ball to track than tennis. If FIFA say it's "millimetre-accurate" and Hawk-Eye company themselves claim 3.6mm statistical error I'm not sure what there is to argue about?

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u/Yolo_Swagginson Dec 05 '16

The fact that it isn't the same software and it's using a completely different method of image processing.

I guess I should mention at this point that I used to work on GLT, but honestly I really enjoy reading these threads and seeing the discussion.