If you observe carefully, Star Trek doors seem to detect intent rather than proximity. Sometimes people are just in front of them talking and as soon as they fi

If you observe carefully, Star Trek doors seem to detect intent rather than proximity. Sometimes people are just in front of them talking and as soon as they finish and want to get through, the door magically knows it needs to open. On the other hand, when they are facing someone through the door and want to close it, they usually have to press a little button next to it. Maybe it could be possible IRL with a face detector and looking at the direction and speed of the person.