Abstract: A technique of composing mosaics from sports videos is proposed.First we select means of the temporal median for background composition,then we propose a foreground mix technique based on foreground region extraction and α-composition.To estimate the global motion,Konrad algorithm investigated in the framework of MPEG-4and an outlier filter based on Fisher discriminant are used.The foreground mask is extracted from margin image by median filter and morphological filter.We add foreground region to background with α-composition.The final panoramas clearly show the full background and vivid actions of athletes.