Scene cut detection from MPEG video stream coded without B pictures

We propose an algorithm that automatically detects clear scene cut locations from an MPEG-1 video bit stream coded with a GOP structure of M=1, without B pictures. The algorithm detects scene cuts at P type pictures by monitoring the percentage of intramacroblocks per P picture. while scene cuts at I pictures are detected by matching the macroblock type of the two P pictures at the GOP boundaries. A "type matching parameter" (TMP) is developed to estimate the matching degree between the macroblock types of two P pictures. It is shown that the method is able to identify the location of scene cuts in P and I pictures with a high success rate