In order to get the main information automatically

while the redundant information is less

the LLE-Adaptive FCM and LLE-Adaptive threshold FCM are presented in this paper.At the beginning of two algorithms

getting the feature vectors of video frames via locally linear embedding (LLE)

and then inputing the feature vectors into LLE-Adaptive FCM and LLE-Adaptive threshold FCM

the results of clustering and Clustering centers will be got.Adaptive FCM through clustering validity function to determine the classification numbers

and Adaptive threshold FCM through the automatic changes of threshold to determine the number of classification.Finally

computing the Video Abstracts which have the shortest distances between video frames and clustering centers.The exams show that the extracting key frames can express the main content of video and redundant information is less when without artificial intervention.