Imagine a camera with only one column of pixels, so a resolution of 1x3000, for example. You point it in a fixed direction and you keep firing extremely fast. Eventually you’ve photographed everything that has passed the camera. Paste the pixels together from right to left, and you’ve got something resembling a normal photograph, but with some distortions due to the time difference between the photos. For example, if someone put their foot on the ground in front of the camera, it will be stationary between photos and appear smeared out in the final result. Since every column of pictures is made at the exact same location, you can determine that the person on the right has finished first and the person on the left last. They apparently measure this at the level of the torso (the red lines).

[–] Ghoelian@lemmy.dbzer0.com 1 points 3 months ago (1 children)

Ahh so if I understand correctly, the track and the ads behind them are actually the same part of the track, instead of the area actually behind them?

[–] oktoberpaard@feddit.nl 1 points 3 months ago* (last edited 3 months ago)

The red lines on the finish line are real and the ads are projected from a small vertical projector at the other side of the track and are not visible in real life.

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