1. A computer-implemented method comprising: accessing a first captured image that includes (1) one or more projected objects in a first display produced at a first point in time by a set of instructions executed by a computing device, and (2) a user interacting with the first display and not part of the first display; accessing a second captured image that includes (1) one or more of the projected objects in a second display produced at a second point in time by the set of instructions executed by the computing device, and (2) the user interacting with the second display and not part of the second display; determining a display image motion map based on the first display and the second display, the display image motion map describing motion of the one or more projected objects; determining a captured image motion map based on the first captured image and the second captured image, the captured image motion map describing motion of both the user and the one or more projected objects; comparing the display image motion map and the captured image motion map to segment motion of the user from motion of the one or more projected objects; determining motion of the user based on a result of the comparing of the display image motion map and the captured image motion map; and relating the determined motion of the user to a portion of one or more of the first and second captured images.