What's new

Player Watch Player Watch: Richarlison

whitesocks

The past means nothing. This is a message for life
Jan 16, 2014
4,652
5,738
Wonderful goal by richarlison. It is the main reason we watch football.
VAR was not transparent on why the goal was ruled out.
If the details are so small that they somehow cannot be displayed then a lot of people are going to conclude that any evidence would not stand up to fair scrutiny.
 

rsmith

The hand of Ghod
Nov 8, 2006
792
848
Genuine question, because I really don't know how VAR works for offsides.
1/ What is the engineering tolerance of the parallel lines they use? Are they considered to be parallel with the byline (and if so, which one), or perpendicular to the touchline (which one)? Since they are determined from computer analysis of the camera picture, which camera? Is it an average of all cameras, or is only one used?
2/ Since the decision is based on when the ball is played, is the ball considered played when the passer's foot first makes contact with the ball, or when the ball leaves the foot? A quick google throws up 10ms as the contact time, which at 20km/h sprit speed is around 5cm.

My point is, given all of the inbuilt margins of error, any decision that a player is offside by a fraction of a centimeter can't be considered reliable and we have to go back to the original benefit-of-the-doubt.

Yeah, I know I'm overthinking it, but I need somthing to do in the two minutes I'm waiting for the VAR decision :)

Even more worrying, I love Richie, but I'm starting to love him in the same way I loved Pav, Soldado and Janssen which doesn't bode well.
 

allatsea

Well-Known Member
Aug 31, 2012
8,951
16,204
Genuine question, because I really don't know how VAR works for offsides.
1/ What is the engineering tolerance of the parallel lines they use? Are they considered to be parallel with the byline (and if so, which one), or perpendicular to the touchline (which one)? Since they are determined from computer analysis of the camera picture, which camera? Is it an average of all cameras, or is only one used?
2/ Since the decision is based on when the ball is played, is the ball considered played when the passer's foot first makes contact with the ball, or when the ball leaves the foot? A quick google throws up 10ms as the contact time, which at 20km/h sprit speed is around 5cm.

My point is, given all of the inbuilt margins of error, any decision that a player is offside by a fraction of a centimeter can't be considered reliable and we have to go back to the original benefit-of-the-doubt.

Yeah, I know I'm overthinking it, but I need somthing to do in the two minutes I'm waiting for the VAR decision :)

Even more worrying, I love Richie, but I'm starting to love him in the same way I loved Pav, Soldado and Janssen which doesn't bode well.
Can't answer your technical question but I thought, most likely completely wrongly, VAR was there to stop clear and obvious errors. Instead it seems to be micro managing and in so doing is completely spoiling games.
 

jonnyp

Well-Known Member
Jun 11, 2006
7,260
9,811
Genuine question, because I really don't know how VAR works for offsides.
1/ What is the engineering tolerance of the parallel lines they use? Are they considered to be parallel with the byline (and if so, which one), or perpendicular to the touchline (which one)? Since they are determined from computer analysis of the camera picture, which camera? Is it an average of all cameras, or is only one used?
2/ Since the decision is based on when the ball is played, is the ball considered played when the passer's foot first makes contact with the ball, or when the ball leaves the foot? A quick google throws up 10ms as the contact time, which at 20km/h sprit speed is around 5cm.

My point is, given all of the inbuilt margins of error, any decision that a player is offside by a fraction of a centimeter can't be considered reliable and we have to go back to the original benefit-of-the-doubt.

Yeah, I know I'm overthinking it, but I need somthing to do in the two minutes I'm waiting for the VAR decision :)

Even more worrying, I love Richie, but I'm starting to love him in the same way I loved Pav, Soldado and Janssen which doesn't bode well.

I've brought up the same points as you on here before. Ref also https://www.premierleague.com/news/1488423

Regarding 1) If you go to their page ref above it states which cameras are used - depends on situation it seems. What I'd like to know is what is the margin of error on these lines that are drawn? If they are even off by fraction of a degree, that can have a major impact depending on player positions. There is +- something in uncertainty in any measurement, and I'm thinking this uncertainty is significant with regard to the accuracy they are proclaiming to achieve.

On top of that they then have a human placing horizontal lines, vertical ones sometimes as well no less, on an image with pretty low resolution (compared to the accuracy they are trying to measure at least). All this just enlargens the margin of error further.

Regarding 2) There is also the issue with the frame rate that they are using to review. It's said they use 50 fps, which means there is 20ms between each frame. Most likely they never even have a frame that captures the exact moment a passing player touches the ball either - it will have happened somewhere between two frames. The logical thing would then at least to go back and use the the last frame before you see the ball leave the passing players foot (they don't seem to care much about doing that though most times).

However the PL VAR page regarding how they determine offsides doesn't say anything about accuracy, margin of error, uncertainty in measurement - absolutely nothing - and that pretty much tells me all I need to know.

In my opinion, there is no way the system is accurate enough to support many of the calls VAR are currently making, and the system should be scrapped. Why clubs accept this nonsense is beyond me.

VAR should review the replays with no lines, and if they cannot see a clear offside then they should sit back down and STFU.
 
Last edited:

slartibartfast

Grunge baby forever
Oct 21, 2012
18,320
33,955
I've brought up the same points as you on here before. Ref also https://www.premierleague.com/news/1488423

Regarding 1) If you go to their page ref above it states which cameras are used - depends on situation it seems. What I'd like to know is what is the margin of error on these lines that are drawn? If they are even off by fraction of a degree, that can have a major impact depending on player positions. There is +- something in uncertainty in any measurement, and I'm thinking this uncertainty is significant with regard to the accuracy they are proclaiming to achieve.

On top of that they then have a human placing horizontal lines, vertical ones sometimes as well no less, on an image with pretty low resolution (compared to the accuracy they are trying to measure at least). All this just enlargens the margin of error further.

Regarding 2) There is also the issue with the frame rate that they are using to review. It's said they use 50 fps, which means there is 20ms between each frame. Most likely they never even have a frame that captures that exact moment either - it will have happened somewhere between two frames. The logical thing would then at least to go back and use the the last frame before you see the ball leave the passing players foot (they don't seem to care much about doing that though most times).

However the PL VAR page regarding how they determine offsides doesn't say anything about accuracy, margin of error, uncertainty in measurement - absolutely nothing - and that pretty much tells me all I need to know.

In my opinion, there is no way the system is accurate enough to support many of the calls VAR are currently making, and the system should be scrapped. Why clubs accept this nonsense is beyond me.

VAR should review the replays with no lines, and if they cannot see a clear offside then they should sit back down and STFU.
That all it needs, no lines, 3 peoples opinions, go with majority. Id even take just the Ref having a look on the monitor. Quick look, done
 

leethfc14

Well-Known Member
Aug 20, 2013
45
278
He was already injured in the warmup after miskicking a ball when doing shooting practice about 20 minutes before kick off.
 

hughy

I'm SUPER cereal.
Nov 18, 2007
31,923
57,125
Hopefully the tears were just pure frustration, and not due to knowing he had caused real damage. Third potentially long-term injury this season though, so frustrating.
 
Top