A breakthrough system can see through walls by using Wi-Fi routersResearchers have been working on ways to “see” people without using cameras or expensive LiDAR hardware for years.The team used DensePose, a system for mapping all of the pixels on the surface of a human body in a photo, which was developed by London-based researchers and Facebook’s AI team.They then created a deep neural network that maps WiFi signals’ phase and amplitude sent and received by routers to coordinates on human bodies.The technology works by sending a low-powered WiFi signal through a wall, which reverberates around the room.Using WiFi, they wrote, overcomes obstacles like poor lighting and occlusion that regular camera lenses face."