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Abstract. Building on the argument that the change of motion states attracts more attention than the motion itself, this letter develops a novel method for key-frame extraction based on motion acceleration vectors. Different from the traditional methods using maximal or minimal motion energy, the proposed method uses the change of motion states, in magnitude and phase, of the main moving objects as the metric for key-frame extraction. Experimental results show that although similar objective performance is achieved by using the proposed method to that achieved with a widely used method based on motion energy, the key frames extracted by the proposed method are more consistent with human perception.