Re: Denim blockers?
>None of the images seems capable of tracking their legs, and they all seem to be wearing jeans.
Legs are curved. The areas of the body this system 'sees' most clearly are flat and head-on to the sensor.
Did you notice that the people in the video all held their hands open, with fingers together and facing the camera? That clinched it for me.
If this system fired ping-pong balls at the subject and counted the ones that came directly back to it, the resulting heatmap wouldn't look too different to this team's images.