Abstract: A method of tracking a user's toothcare activity comprises receiving video images of a user's face during, e.g. a toothbrushing session, and identifying, in each of a plurality of frames of the video images, predetermined features of the user's face. The features include at least two invariant landmarks associated with the user's face and one or more landmarks selected from at least mouth feature positions and eye feature positions. Predetermined marker features of a toothcare appliance, e.g. a brush in use are identified in each of the plurality of frames of the video images. From the at least two invariant landmarks associated with the user's nose, a measure of inter-landmark distance is determined. An appliance length normalised by the inter-landmark distance is determined. From the one or more landmarks selected from at least mouth feature positions and eye feature positions, one or more appliance-to-facial feature distances each normalised by the inter-landmark distance is determined.

Abstract: A method of identifying a toothbrush user from among a plurality of different toothbrush users comprises obtaining data indicative of toothbrush motion relative to at least two axes of the toothbrush and filtering the motion data to extract motion data over a predetermined frequency range, such as within a predetermined frequency passband. A motion component distribution of the filtered motion data is determined, and the motion component distribution is compared with a plurality of user-specific motion component distributions to establish the data as indicative of one of said plurality of users. Toothbrushing data captured by a multi-user toothbrush motion tracking system can thereby be ascribed to a correct user within a cohort of users of the system.

Abstract: An augmented mirror comprising: a partially silvered mirrored surface; a screen underneath the mirrored surface; a camera; and a computer module for receiving data from the camera and for providing graphical images to the screen, wherein the field of view over which visual information is processed is reduced to visual information from within a visual corridor, the visual corridor corresponding to a subset of the field of view of the camera.

Abstract: An augmented mirror for use with one or more user objects, the augmented mirror comprising: a partially silvered mirrored surface; a screen underneath the mirrored surface; a camera including a depth scanner; and a computer module for receiving data from the camera and for providing graphical images to the screen; wherein the sole means of communication with the computer module is via the one or more user objects.

Abstract: An augmented mirror for use with one or more user objects, the augmented mirror comprising: a partially silvered mirrored surface; a screen underneath the mirrored surface; a camera including a depth scanner; and a computer module for receiving data from the camera and for providing graphical images to the screen; wherein the sole means of communication with the computer module is via the one or more user objects.

Abstract: An augmented mirror comprising: a partially silvered mirrored surface; a screen underneath the mirrored surface; a camera; and a computer module for receiving data from the camera and for providing graphical images to the screen, wherein the field of view over which visual information is processed is reduced to visual information from within a visual corridor, the visual corridor corresponding to a subset of the field of view of the camera.