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FIFA World Cup 2022: Semi-Automated VAR, Years in the Making, Makes a Difference

28/11/2022

FIFA World Cup 2022: Semi-Automated VAR, Years in the Making, Makes a Difference 12 dedicated cameras help determine exact player and ball positions for offside calls By Ken Kerschbaumer

Monday, November 28, 2022 - 8:00 am

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Semi-automated offside technology, announced in July, has already been having an impact at the 2022 FIFA World Cup. Offering a support tool for both video match officials and on-field referees, the new technology mounts 12 dedicated cameras beneath the stadium roof to track the ball (which also has sensors) and up to 29 data points for each player, 50 times per second, to calculate their exact position on the pitch. The 29 collected data points include all limbs and extremities relevant for making offside calls.

World Cup fans can now more easily see how a player has gone offsides.

The new technology will provide the video match officials with real-time offside alerts using artificial intelligence, says FIFA Director, Football Technology and Innovation, Johannes Holzm ller. As the video match officials will be quality-controlling these outputs, we still refer to the system as semi-automated offside' as the video match officials have to validate the proposed decision and then inform the on-field referee. By using the exact same data to create a 3D animation for in-stadium fans and TV viewers, fans will receive a quick and accurate visualization of the offside situation.

The efforts build off the successful use of VAR (video assistant referee) technology at the 2018 FIFA World Cup in Russia, FIFA President Gianni Infantino declared in The Vision 2020-23 that FIFA would strive to harness the full potential of technology in football and further enhance VAR. By working with Adidas and various partners and especially with the Working Group for Innovation Excellence and technology providers, FIFA has spent the past few years further improving the VAR system, including use of semi-automated offside technology.

The new semi-automated offside technology measures nearly 30 body points.

One of the main challenges in the development of an advanced offside technology is the accurate and automated detection of the kick-point. Possible solutions - notably, tracking data from sensor technology or video data from camera systems - were considered.

Furthermore, a system has to correctly identify which body part places a player onside or offside. Accuracy tests have shown that human operators tend to pick different body parts for offside lines. Strides have been made in that area as well, with the automated system provided learning to correctly model a player's skeleton. In the future, the developed algorithms of the system should be able to automatically identify which body part placed the player offside and by what distance.

The official match ball will provide a further vital element for the detection of tight offside incidents as an inertial measurement unit (IMU) sensor will be placed inside the ball. This sensor, positioned in the center of the ball, sends ball data to the video-operation room 500 times per second, enabling very precise detection of the kick point.

By combining the limb- and ball-tracking data and applying artificial intelligence, the new technology provides an automated offside alert to the video match officials inside the video-operation room whenever the ball is received by an attacker who was in an offside position at the moment the ball was played by a teammate. Before informing the on-field referee, the video match officials validate the proposed decision by manually checking the automatically selected kick point and the automatically created offside line, which is based on the calculated positions of the players' limbs. This process happens within a few seconds and means that offside decisions can be made faster and more accurately.

After the decision has been confirmed by the video match officials and the referee on the pitch, the positional data points used to make the decision are generated into a 3D animation that perfectly details the position of the players' limbs at the moment the ball was played. The animation, which will always show the best possible perspectives for an offside situation, will be shown on the giant screens in the stadium and also made available to FIFA's broadcast partners to inform all spectators in the clearest possible way.

The data collected during online and offline tests has been analyzed and validated by the MIT Sports Lab, with TRACK at Victoria University scientifically validating the limb-tracking technology. Further insights into the technological capabilities of such multi-camera tracking systems are provided by a research team at ETH Zurich.

Semi-automated offside technology is an evolution of the VAR systems that have been implemented across the world, says Infantino. FIFA is committed to harnessing technology to improve the game of football at all levels, and the use of semi-automated offside technology at the FIFA World Cup in 2022 is the clearest possible evidence.

FIFA Referees Chairman Committee Pierluigi Collina notes that VAR has already had a very positive impact on football: We can see that the number of major mistakes has already been dramatically reduced. We expect that semi-automated offside technology can take us a step further. We are aware that sometimes the process to check a possible offside takes too long, especially when the offside incident is very tight. This is where semi-automated offside technology comes in: to offer faster and more accurate decisions.
LINK: https://www.sportsvideo.org/2022/11/28/2022-fifa-world-cup-semi-automa...
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