From there, according to their recently-uploaded preprint paper published on arXiv, they developed a deep neural network that maps WiFi signals’ phase and amplitude sent and received by routers to coordinates on human bodies.Researchers have been working on “seeing” people without using cameras or expensive LiDAR hardware for years.Using WiFi, they wrote, overcomes obstacles like poor lighting and occlusion that regular camera lenses face.“In fact, most households in developed countries already have WiFi at home, and this technology may be scaled to monitor the well-being of elder people or just identify suspicious behaviors at home.”They don’t mention what “suspicious behaviors” might include, if this technology ever hits the mainstream market.But considering companies like Amazon are trying to put Ring camera drones inside our houses, it’s easy to imagine how widespread WiFi-enabled human-detection could be a force for good—or yet another exploitation of all of our privacy."