Patent attributes
Methods, systems, and apparatus, including computer programs encoded on computer-storage media, for location tracking. In some implementations, a corresponding method includes obtaining images of one or more persons within a property; identifying a heartbeat for each person of the one or more persons within the images; identifying a location for each person within the images; receiving a request that indicates a heartbeat signature generated from heartbeats sensed by a device worn by a user; determining that an identified heartbeat of a person of the one or more persons matches the heartbeat signature; in response to determining that the identified heartbeat of the person of the one or more persons matches the heartbeat signature, selecting the person as the user; and in response to selecting the person as the user, providing a response to the request based on a location of the person.
