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motion estimation
4.0
Video coding has been the subject of many research works in last decades. A large number of coding solutions have been described to fit with the diversity of the compression standards and the requested coding performances, which are correlated to the constraints defined by the user or fixed by the environment (i.e. networks used for data transmission and the target receiver setup). Consequently, a large number of video codec has been developed. Despite this diversity, some particular processing stages, such as motion
estimation [1], are implemented in most of the proposed
zalak901161 1 0
1
gaussian noise pulses
no vote
H.264 introduces two new features to ME, the VBSME and
the sub-pixel accuracy motion estimation. The VBSME is
carried out in two phases: integer motion estimation (IME)
and fractional motion estimation (FME). In H.264, VP8
and other video codec, a 1616 sized macro-block can be
further partitioned into 16 8, 8 16, 8 8, 8 4, 4 8
and 4 4 sub-blocks a
zalak901161 1 0
1
Gaussian pulse generator
no vote
Many ME algorithms have been described in the literature. The most accurate strategy is the Full Search (FS) algorithm, which by exhaustively comparing all positions in the search window, gives the most accurate motion vector which causes SAD to be minimum. On the other hand, fast but sub-optimal algorithms compute the best matching candidate by guiding the search procedure using predefined search patterns. For instance, square-shaped or hexagonshaped or diamond-shaped search patterns with different sizes are employed in several fast motion algorithms such zalak901161 2016-08-23
zalak901161 0 0
1
motion compensation
no vote
When all sub-blocks are in uniform motion, all subblock motion vectors will be the same as the motion vector
for the entire macro-block. Nevertheless, when sub-blocks partitions are moving in different directions, sub-block
motion vectors can differ significantly from each other and from the motion vector of the macro-block. Consequently, the ME unit must be able to generate a separate motion
zalak901161 3 0
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