| Summary: | 碩士 === 國立臺灣師範大學 === 資訊教育研究所 === 89 === This thesis presents a method for detecting key frames from MPEG I/II compressed videos. First, we analyze DC component of DCT coefficients of I frames to extract candidate key frames. Second, removing candidate key frames that differ in luminance only by noting the changes in histogram profiles. Finally, motion information of B frames is used to detect the real shot changing boundaries and extracting the true first (key) frame of the particular scene.
Experiments are conducted using four types of video clips：news, MTVs, commercials, and teaching videos. The results indicate that our method is able to detect key frames accurately in reasonable amount of time.
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