Patent ID: 8428306

Claim:
An information processor comprising: an imaging device adapted to capture the motion of a user provided with a marker as a moving image; a tracking process unit adapted to estimate the contour of the user in each image frame by defining a candidate curve representing the contour of the user in an image frame included in the moving image captured by the imaging device based on the contour of the user estimated in an image frame at a previous time step, and by observing the likelihood of each candidate curve; a history storage unit adapted to successively store the relative position, in each image frame, of an image of the marker in relation to the contour of the user estimated by the tracking process unit; an action determination unit adapted to determine whether an action is performed by checking a time-dependent change in the relative position stored by the history storage unit against a first criteria established for the action; and an output data generating unit adapted to perform, when the action determination unit determines that the action is performed, a process corresponding to the action and generate output data.