US Patent 11172189 User detection for projection-based augmented reality system

In one embodiment, a method includes sending, to an interaction device including a projector and a camera, a media content item and instructions causing the projector to project the media content item on a projectable surface and receiving, from the interaction device, one or more media objects captured by the camera, where one or more of the media objects include images of a user in proximity to the projectable surface. The method includes determining one or more movements of the user based on the one or more of the media objects and updating the media content item based on the determined movements. The method also includes sending, to the interaction device, the updated media content item and instructions causing the projector to project the updated media content item on the projectable surface.