Is there something low-cost and purpose-built to do this at short range, for when you just want to do some body tracking for VR/metaverse stuff? The trouble with doing this with a webcam is that occlusion results in errors and the avatar's limbs jump around. This sort of RF thing has more field of view, too.
> Plume began testing Wi-Fi motion detection technology developed by Cognitive Systems in early 2020, and the company is now considering offering additional services atop of that technology. These could include triggers that help consumers save energy by automatically turning off lights after someone leaves a room, or even provide security and elder care products.
That's not imaging, that's tracking a WiFi equipped target. That's pretty standard now. Sony's Mocopi is probably the most elegant implementation.[1] Tundra Tracker [2] also gets good reviews.
Motion detection is much lower rez. Ultrasound is like trying to sense the world with a probe the size of a broom.
> Our system tracks free-form activity by estimating a 3D skeleton pose that consists of a set of joints of the human body. In particular, Winect first identifies the moving limbs by leveraging the signals reflected off the human body and separates the entangled signals for each limb. Then, our system tracks each limb and constructs a 3D skeleton of the body by modeling the inherent relationship between the movements of the limb and the corresponding joints. Our evaluation results show that Winect achieves centimeter-level accuracy for free-form activity tracking under various environments.
