Camera looking at blank wall can determine number of people and activity
- morrislee
- Sep 1, 2021
- 1 min read
Camera looking at blank wall can determine number of people and activity
What You Can Learn by Staring at a Blank Wall
arXiv paper abstract https://arxiv.org/abs/2108.13027v1
arXiv PDF paper https://arxiv.org/pdf/2108.13027v1.pdf
We present a passive non-line-of-sight method that infers the number of people or activity of a person from the observation of a blank wall in an unknown room.
... analyzes complex imperceptible changes in indirect illumination in a video of the wall to reveal a signal that is correlated with motion in the hidden part of a scene.
... classify between zero, one, or two moving people, or the activity of a person in the hidden scene.
... train ... networks using data collected from 20 different scenes
.., achieve an accuracy of ~94% for both tasks in unseen test environments and real-time online settings.
... technique does not rely on known occluders or controllable light sources, and generalizes to unknown rooms with no re-calibration. ...
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