Abstract: The Slow-motion replay(SMR) detection is an important technique for content-based video analysis. This paper introduced the basic theory of video compression and MPEGl video compression standard. A two-step method for SMR detection on MPEG-1 uncompressed domain was proposed, in which firstly shot density was defined and calculated based on shot detection results using MPGE macroblock types information to detect the occurrences of possible SMR shots,and secondly the difference between consecutive frames was measured to detect true SMR in candidate SMR shots.Experiments results show that unlike previous approaches, our method has great improvement in both speed and accuracy.

Key words: Slow-motion replay detection, Shot cut,Content-based video analysis, MPEG compressed domain, Macroblock tyoe