本代码作为初学者，读取AVI电影（matlab能读的AVI电影难找），并提取关键祯，做差分-The code as a beginner, read AVI movie (matlab can read the AVI movie hard to find), and extract key frames, so differential

用matlab读取avi格式电影的方法（用matlab读取avi格式电影的方法）-Read avi format movie using matlab (matlab to read Avi format movies)