Why the BCCI changed its stance on DRS

[fineleg]

Explainer - Why the BCCI changed its stance on DRS

Higher frame rates for cameras and a safeguard to prevent operator error were the key improvements in technology that led to the BCCI agreeing to trial the system

 

http://www.espncricinfo.com/india/content/story/1062671.html

 

Quote

 

Despite winning the 2011 World Cup and the 2013 Champions Trophy with DRS in place, India had resisted using the system in bilateral series. On Wednesday the ICC general manager Geoff Allardice and a representative from Hawk-Eye, the ball-tracking technology provider, met top BCCI officials along with India coach Anil Kumble in Delhi.

Allardice focused on the independent assessment of the technologies used in the DRS, which was carried out by engineers from the field-intelligence unit at the Massachusetts Institute of Technology [MIT]. The Hawk-Eye presentation explained how ball-tracking technology has been enhanced over the last couple of years.

The upshot of the meeting was that two days later India agreed to use the DRS on a trial basis during the Test series against England. Here's an explainer of what their concerns were and how they were allayed.

Why did the BCCI not want the DRS?
The main reason was a mistrust of the ball-tracking technology used to adjudge lbws. The BCCI said the predicted path after the ball hit the pad was not reliable.

How does ball-tracking work?
Three elements go into an lbw decision: where the ball pitched, the point of impact on the pad, and the predicted path towards the stumps. The accuracy of the predicted path of the ball depends on the number of images captured - the frame-rate - between the ball pitching and hitting the pad.

What is the most significant change in the technology?
Cameras with a higher frame rate, and the ability to locate the point of impact on the pad more accurately.

 

How fast are the frame rates now?
During the 2011 World Cup, the frame rate of Hawk-Eye's cameras was 50 to 75 frames per second. Hawk-Eye's ultra-motion cameras recorded images at a faster rate in 2013, and their current ball-tracking cameras record images at 340 frames per second.

How will a higher frame rate help?  It provides a lot more data and hence the calculation of the predicted path of the ball is more accurate. "The increased frame rate has allowed the accuracy of the prediction to tighten up significantly," an official privy to Wednesday's presentation said. "It means between the ball pitching and the ball hitting the pad there is more information available to go into building a prediction. That was something reinforced by the recent testing of the accuracy of a prediction, when compared to the accuracy of a ball that has not been intercepted."

Why did the BCCI have an issue with the location of the point of impact?
When judging the point where the ball hits the pad, a key factor is to make sure the ball has not changed path. The BCCI had said there was potential for operator error while identifying the point of impact.

How was that issue solved?
Hawk-Eye created Ultra Edge to remove that problem. Ultra Edge is a sound based, edge-detection system can identify the point of impact more accurately. When there is a sound of ball hitting pad or bat, it can identify the frame in which the ball hits the pad.

What if the operator misses the ball? How will they locate point of impact?
Hawk-Eye has added another safeguard to its system: data from every delivery is recorded and can be retrieved in case it's needed to build a predicted path of the delivery.

 

 

[MechEng]

Good to see BCCI's justified assertiveness with the DRS issue while the cricinfo brigade accused them of being bullies.

[Asim]

[Iconoclast]

Higher frame rates for cameras

 

 A safeguard to prevent operator error

 

They could have just admitted they were wrong all these years ...

 

 

[Asim]

Making a confession u had a total Failed Logic and wrong policy all the time would be less embarrassing than the justifications above to accept DRS...

[MCcricket]

Ball tracking was not accurate and that is true also operator error was glaring showing wrong deliveries also most experienced players n ex players have now spoken against it so yes here BCCI was correct, n frame rate accurate data is true which people who R not into technology would understand easily

[Malcolm Merlyn]

Making a confession u had a total Failed Logic and wrong policy all the time would be less embarrassing than the justifications above to accept DRS...

What confession?

The operator role has been eliminated from determining the point of impacted.So human error element is gone.

There was nothing wrong with the policy and since Hawk Eye has changed by incoporating new technologies nothing wrong in giving it a trial.

[MechEng]

6 hours ago, Iconoclast said:

Higher frame rates for cameras

 

 A safeguard to prevent operator error

 

They could have just admitted they were wrong all these years ...

 

 

Well in case you've studied calculus, you will also understand high frame rate logic. For example when we calculate the area under a parabolic curve which almost looks like a straight line to naked eye, most of us would be tempted to use the standard area of triangle formula, but if the same is solved using definite integrals, it will give a more accurate answer (integration is all about adding infinitesimally small elements).

 

Similarly high frame rates takes smallest details of the ball path into account, hence giving a more accurate picture of the trajectory of the ball.

[gattaca]

10 minutes ago, MechEng said:

Well in case you've studied calculus, you will also understand high frame rate logic. For example when we calculate the area under a parabolic curve which almost looks like a straight line to naked eye, most of us would be tempted to use the standard area of triangle formula, but if the same is solved using definite integrals, it will give a more accurate answer (integration is all about adding infinitesimally small elements).

 

Similarly high frame rates takes smallest details of the ball path into account, hence giving a more accurate picture of the trajectory of the ball.

Wow dude you got good basics. Still remember integrals dividing infinitely small elements on the curve.

[kruiser]

But it still is umpire decision justification system. When ever referred to 3rd umpire, the decision should be made in a blank slate, ignoring what the umpire in middle said. That will make it consistent and will also get rid of umpires call component.

Imo BCCI should have asked for this as well

[MechEng]

36 minutes ago, gattaca said:

Wow dude you got good basics. Still remember integrals dividing infinitely small elements on the curve.

Finished undergrad 2 years ago, which is why I  still remember the stuff.

[Laaloo]

2 hours ago, MechEng said:

Well in case you've studied calculus, you will also understand high frame rate logic. For example when we calculate the area under a parabolic curve which almost looks like a straight line to naked eye, most of us would be tempted to use the standard area of triangle formula, but if the same is solved using definite integrals, it will give a more accurate answer (integration is all about adding infinitesimally small elements).

 

Similarly high frame rates takes smallest details of the ball path into account, hence giving a more accurate picture of the trajectory of the ball.

I dont think he knows what Calculus is. Care to dumb it more down for him?

[Sajid_Rana]

Because Tendulkar retired.

[Iconoclast]

I don't know how we got into a math discussion but since we are here calculation the trajectory of the ball at any instance requires differential calculus not integrals. Maybe Laaloo bhai can explain when he is off from the liquor shop.

 

As for frame rates they were high enough before ... BCCI has changed it stance because Dhoni and the oldies who were afraid of DRS are gone and the new captain sees how it can instead help his bowlers in getting more lbw decisions.