| 摘要 |
A method of extracting key frames from a video sequence, which video sequence comprises MPEG compressed video data having block motion vectors. The method initially partially decompresses ( 202 ) the MPEG compressed video data to obtain block motion vectors and converts ( 204 ) the block motion vectors to forward block motion vectors. The method then generates ( 206 ) global motion signals and generates ( 306 ) dominant global direction clusters. The method then selects ( 402,404,406 ) potential key frames of the video sequence using the generated dominant global direction clusters. The method lastly decompresses ( 408 ) the selected key frames to obtain the extracted key frames.
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