1. A system for reconstructing 3-dimensional motion of a human figure from a monocularly viewed image sequence of a person, comprising: means for digitizing said monocularly viewed image sequence; means for providing 3-d motion training data including representative motions and markers therefor as a training image sequence; means for grouping said 3-d motion training data and said digitized image sequence into temporal segments, each temporal segment including a predetermined number of frames; means, coupled to said means for digitizing and said means for grouping, for optimizing said temporal segments of said 3-d motion training data according to said markers so as to find a linear combination of said temporal segments of said 3-d motion training data corresponding to said monocularly viewed image sequence.