The three-dimensional subband/wavelet codecs use 5/3 filters rather than Haar filters for the motion compensation
temporal filtering (MCTF) to improve the coding gain. In order to curb the increased motion vector rate, an adaptive
motion mode driven spatiotemporal motion vector prediction (AMDST-MVP) scheme is proposed. First, by making use
of the direction histograms of four motion vector fields resulting from the initial spatial motion vector prediction (SMVP),
the motion mode of the current GOP is determined according to whether the fast or complex motion exists in the
current GOP. Then the GOP-level MVP scheme is thereby determined by either the S-MVP or the AMDST-MVP,
namely, AMDST-MVP is the combination of S-MVP and temporal-MVP (T-MVP). If the latter is adopted, the motion
vector difference (MVD) between the neighboring MV fields and the S-MVP resulting MV of the current block is
employed to decide whether or not the MV of co-located block in the previous frame is used for prediction the current
block. Experimental results show that AMDST-MVP not only can improve the coding efficiency but also reduce the
number of computation complexity.
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