How does the hawkeye work? - TennisForum.com
 5Likes
  • 2 Post By bobito
  • 1 Post By comfortably numb
  • 2 Post By bobito
 
LinkBack Thread Tools
post #1 of 8 (permalink) Old Nov 7th, 2019, 11:37 AM Thread Starter
-LIFETIME MEMBER-
 
Hugues Daniel's Avatar
 
Join Date: May 2013
Location: Manosque
Posts: 36,687
                     
How does the hawkeye work?



Imagine this ball on your right side, barely missing the line, out by an inch. Will the hawkeye judge it out too? Because the image the hawkeye will show is a visual one, and sometime I get the impression it counts the side of the ball as part of the ball touching the line. The screen may then show a ball touching the line whereas it didn't.

What do you think?

Who cares of hypertrophic weapons when the player on the court moves like music?
Hugues Daniel is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old Nov 7th, 2019, 11:55 AM
-PREMIUM MEMBER-
 
bobito's Avatar
 
Join Date: May 2008
Posts: 13,944
                     
Re: How does the hawkeye work?

Quote:
Originally Posted by Hugues Daniel View Post


Imagine this ball on your right side, barely missing the line, out by an inch. Will the hawkeye judge it out too? Because the image the hawkeye will show is a visual one, and sometime I get the impression it counts the side of the ball as part of the ball touching the line. The screen may then show a ball touching the line whereas it didn't.

What do you think?
Tennis balls don't look like that when they bounce. They look like this

bud887 and posthuman like this.
bobito is offline  
post #3 of 8 (permalink) Old Nov 7th, 2019, 05:00 PM
Senior Member
 
comfortably numb's Avatar
 
Join Date: Sep 2016
Location: mosc
Posts: 388
                     
Re: How does the hawkeye work?

Quote:
Originally Posted by Hugues Daniel View Post

Imagine this ball on your right side, barely missing the line, out by an inch. Will the hawkeye judge it out too? Because the image the hawkeye will show is a visual one, and sometime I get the impression it counts the side of the ball as part of the ball touching the line. The screen may then show a ball touching the line whereas it didn't.

What do you think?
Hawkeye does not analyse an image like this. There are several stationary cameras located high around the court, and they feed into a computer which processes the images taken at different angles to calculate the ball's trajectory and where it will land. The size and shape of the expected mark is adjusted for the speed, direction and curvature of the path
Hugues Daniel likes this.
comfortably numb is online now  
 
post #4 of 8 (permalink) Old Nov 7th, 2019, 06:49 PM Thread Starter
-LIFETIME MEMBER-
 
Hugues Daniel's Avatar
 
Join Date: May 2013
Location: Manosque
Posts: 36,687
                     
Re: How does the hawkeye work?

Quote:
Originally Posted by comfortably numb View Post
Hawkeye does not analyse an image like this. There are several stationary cameras located high around the court, and they feed into a computer which processes the images taken at different angles to calculate the ball's trajectory and where it will land. The size and shape of the expected mark is adjusted for the speed, direction and curvature of the path
Thanks for the explanation.

I wish I could find again that slow motion of a shot bouncing an inch outside the line without touching it and the hawkeye judged it "in". I think it was in a Halep match at the YEC. Disturbing. I've seen this two or three times already in the latest years. I guess we'll see that again. I'll try to bookmark it.

Who cares of hypertrophic weapons when the player on the court moves like music?
Hugues Daniel is offline  
post #5 of 8 (permalink) Old Nov 7th, 2019, 06:58 PM
-PREMIUM MEMBER-
 
bobito's Avatar
 
Join Date: May 2008
Posts: 13,944
                     
Re: How does the hawkeye work?

Quote:
Originally Posted by Hugues Daniel View Post
Thanks for the explanation.

I wish I could find again that slow motion of a shot bouncing an inch outside the line without touching it and the hawkeye judged it "in". I think it was in a Halep match at the YEC. Disturbing. I've seen this two or three times already in the latest years. I guess we'll see that again. I'll try to bookmark it.
I've always said, when people clamour for Hawkeye at clay court events, that it would only take 2 or 3 instances of a mark on the court clearly showing Hawkeye to have been wrong for the system to become undermined and brought into question on all surfaces. There's going to be a margin of error with any such system and that margin of error is likely greater than the manufacturers claim (they are, after all, trying to promote their business). Hawkeye currently works because it's good enough to stop any arguments. Use it on clay, where alternative evidence is there for all to see, and that might not be the case.

It may not be perfect but it's certainly good enough to settle the great majority of line call disputes.
bobito is offline  
post #6 of 8 (permalink) Old Nov 7th, 2019, 07:20 PM Thread Starter
-LIFETIME MEMBER-
 
Hugues Daniel's Avatar
 
Join Date: May 2013
Location: Manosque
Posts: 36,687
                     
Re: How does the hawkeye work?

Quote:
Originally Posted by bobito View Post
I've always said, when people clamour for Hawkeye at clay court events, that it would only take 2 or 3 instances of a mark on the court clearly showing Hawkeye to have been wrong for the system to become undermined and brought into question on all surfaces. There's going to be a margin of error with any such system and that margin of error is likely greater than the manufacturers claim (they are, after all, trying to promote their business). Hawkeye currently works because it's good enough to stop any arguments. Use it on clay, where alternative evidence is there for all to see, and that might not be the case.

It may not be perfect but it's certainly good enough to settle the great majority of line call disputes.
Totally agree. And I don't support hawkeye for clay matches either. The mark is enough (though it doesn't stop players from arguing for that matter ).

Who cares of hypertrophic weapons when the player on the court moves like music?
Hugues Daniel is offline  
post #7 of 8 (permalink) Old Nov 7th, 2019, 07:37 PM
Senior Member
 
MarkNL's Avatar
 
Join Date: Jul 2011
Posts: 14,763
                     
Re: How does the hawkeye work?

Quote:
Originally Posted by Hugues Daniel View Post
Totally agree. And I don't support hawkeye for clay matches either. The mark is enough (though it doesn't stop players from arguing for that matter ).
I don't agree, because on clay also it has happened more than once that people disagree on what in fact is the exact mark. We have seen many examples where an umpire pointed at completely the wrong mark. (Graf vs. Hingis RG 1999 final being the most obvious one)

Play my new Sporcle Quiz!
Junior Girls Top 100 21.12.15:http://www.sporcle.com/games/MarkNL/...-girls-top-100
Tsurenko - Stosur - Lisicki - Kuwata - Hsieh - Hibino - Krajicek - Bertens - Rus - Hogenkamp - Schoofs - Kerkhove - Burger - Marino - Larsson - Lertcheewakarn - Ishizu - Rezai - Diatchenko
MarkNL is offline  
post #8 of 8 (permalink) Old Nov 7th, 2019, 08:21 PM
Senior Member
 
Kurmay3Katti's Avatar
 
Join Date: Aug 2019
Posts: 1,951
                     
Re: How does the hawkeye work?

Quote:
Originally Posted by MarkNL View Post
I don't agree, because on clay also it has happened more than once that people disagree on what in fact is the exact mark. We have seen many examples where an umpire pointed at completely the wrong mark. (Graf vs. Hingis RG 1999 final being the most obvious one)
Does Foxtenn work well for clay? They seem to use some kind of video right?

Ash Barty | Venus Williams | Elina Svitolina | Hsieh Su-wei | Czech players
Kurmay3Katti is online now  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the TennisForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome