... introduces the proposed feature extraction schemes Mainly, they include motion representation through motion estimation, telescopic vector composition, motion residuals, and polar accumulated differences ... coding Feature vector (a) Time-dependent feature extraction In this approach, the motion vectors of each two successive images are estimated and split into their x and y components Each motion vector ... as motion; setting it to a high value results in discarding some motion information, and so forth Following [2], the value of the threshold was determined empirically and set to the mean intensity...