The Semi-Automated Offside Tech at This World Cup Sees What Your Eyes Can't

Cameras tracking dozens of body points, a chip in the ball, and a verdict in seconds.

<p>Offside calls used to hinge on one human with a flag sprinting to keep up with the fastest athletes alive. At this summer's World Cup across the US, Mexico and Canada, the machines are helping.</p>

<p>Semi-automated offside technology uses banks of cameras tracking multiple data points on every player's body, many times per second, plus a sensor in the ball that logs the exact moment it's kicked.</p>

<p>When an offside is detected, the system alerts the video officials, who verify it and pass it to the referee. Fans in the stadium then see a 3D animation of the decision — a freeze-frame with a virtual line.</p>

<p>Why 'semi' automated? Because humans still confirm every call, and judgment questions — like whether a player interfered with play — stay human too. The robots draw the line. People still decide what it means.</p>