"If you take the freeze-frame from the animation as your only reference, the line might not appear parallel to the goal line, but this is due to the image's perspective,"
"When a 3D scene is projected onto a 2D image , parallel lines in the real world that recede into the distance appear to converge towards a single vanishing point on the horizon."
"Therefore, since in this image the camera is exactly aligned with the offside line, that line appears perfectly vertical. Any line located to one side or the other will not appear parallel, as can be seen in the goal line to the right of the offside line and in the lines on the grass to its left. Based on everything described above, we conclude that the system worked perfectly, the decision was correct, and the animation was also correct."
A goal was ruled out for a very tight offside, prompting many complaints and a request for an explanation from the Technical Committee of Referees. Hawk-Eye, maker of the semi-automated offside system, explained that the apparent non-parallel offside line in the animation is an effect of perspective when projecting a 3D scene onto a 2D image. The company stated that when the camera aligns exactly with the offside line that line appears vertical, while other lines will not appear parallel. The manufacturer concluded that the system and decision were correct and the animation accurately represented the data.
Read at Barca Blaugranes
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