J.F. <j...@p...onet.pl> wrote:

> Jak oni to zrobili ?

"The track viewed in normal light looks to be almost solid black. But when
viewed through the right type of infrared filter, a pattern emerges. It is
this pattern that the cars see. The pattern basically consists of lines
which the cars follow. There are a series of dashes with varying width
that are situated alongside the lines. The dashes seem to be there as a
means for the car to notice that its getting too far away from the solid
line it is trying to follow."

https://rh6stzxdcl1wf9gj1fkj14uc-wpengine.netdna-ssl
.com/wp-content/uploads/2017/03/anki_drive_robot_car
_track_infrared_pattern_5.jpg

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https://www.youtube.com/watch?v=9lSzL1DqQn0