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Motion-compensated frame interpolation for low bit rate video coding considering accelerated motion

In many video coding schemes, especially at low bitrates, a temporal subsampling of the input image sequence is considered. It is realized by skipping images at the transmitter, and these frames must be reconstructed at the receiver side. In order to prevent jerkiness or blurring in the moving areas, motion-compensated interpolation has to be applied. Frame interpolation algorithms usually consider two consecutively transmitted frames and assume constant velocity linear motion between these frames. The algorithm proposed in our paper assumes constant acceleration -- instead of constant speed -- that is estimated based on three consecutively transmitted images and two corresponding motion fields. This approach is much closer to the real situation than the previous methods taking into account only constant speed motion. The proposed interpolation algorithm results in smoother movement in the final interpolated video sequence. Experiments carried out using real-life image sequences confirm the applicability of the proposed method for low and very low bitrate video coding.