Abstract: Innovations for interactive computer displays (e.g., virtual reality systems) are presented. Motion sensor data is obtained from a motion sensor mounted to a user's head. The motion sensor data is analyzed to determine user movement. A display is updated based on the user movement and output to a display device. Particular embodiments enable a user's natural movement styles to create movement in a virtual reality environment in a highly immersive manner. Further, certain embodiments allow for the user to walk in place (or run in place) and translate that motion into suitable, realistic virtual velocity values for use in a VR environment.

Abstract: In one embodiment, the present disclosure provides a computer implemented method of determining energy expenditure associated with a user's movement. A plurality of video images of a subject are obtained. From the plurality of video images, a first location is determined of a first joint of the subject at a first time. From the plurality of video images, a second location is determined of the first joint of the subject at a second time. The movement of the first joint of the subject between the first and second location is associated with an energy associated with the movement.

Abstract: In one embodiment, the present disclosure provides a computer implemented method of determining energy expenditure associated with a user's movement. A plurality of video images of a subject are obtained. From the plurality of video images, a first location is determined of a first joint of the subject at a first time. From the plurality of video images, a second location is determined of the first joint of the subject at a second time. The movement of the first joint of the subject between the first and second location is associated with an energy associated with the movement.