Akita 1984 : Three fundamental problems of image sequence analysis are investigated for real world human motions. The first one is the modelling of body motion, which is approached by the methods of key frame sequence of stick figures and generalized cone approximation of body parts. The second problem is the correspondence of feature points in the consecutive frames, for which a method called 'window code matching' is proposed. The last one is the analysis of occluding regions, which is studied on the bases of occlusion prediction by model and difference images.