Re: Question about Motion Estimation - 未名空间MITBBS历史存档

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Re: Question about Motion Estimation

Re: Question about Motion Estimation# EE - 电子工程

t*s2001-02-21 08:02

1 楼

Basically there are two kind of motion estimation:
the first one, which is more public awared, is
the block based motion estimation. As tommy mentioned
above, MPEG is actually block based motion estimation
plus DCT as its core compression tech. The motion search
is time consuming, especially for exhausting strategy.
Many Heuristic is based on the assumption of continous
motion distribution, which is also widely agreed. There
are some research concerning about motion estimation
over frequency dom

s*l2001-02-21 08:02

2 楼

pretty well introduction.:)
a little more info that may be useful...
both MPEG and H261/3/+/L use block-based motion estimation.
in general, a macroblock (MB) is of size 16*16 and one
motion vector(MV) is assigned to one MB. another mode can also
be enabled, which applied 4 MVs are estimated for one MB,
which is split into four 8*8 blocks. a compressed MB consists of
MV(s) and residues, which is normally presented in SAD(sum of
absolute difference) as in MPEG and H26x. (although it is claimed
th

【在 t*s 的大作中提到】

: Basically there are two kind of motion estimation:
: the first one, which is more public awared, is
: the block based motion estimation. As tommy mentioned
: above, MPEG is actually block based motion estimation
: plus DCT as its core compression tech. The motion search
: is time consuming, especially for exhausting strategy.
: Many Heuristic is based on the assumption of continous
: motion distribution, which is also widely agreed. There
: are some research concerning about motion estimation
: over frequency dom

d*s2001-02-21 08:02

3 楼

Good to see you guys talking about digital video.
Here is my 2 cents.
For block-based motion estimation in video coding:
Although there are still research on motion estimation, but
algorithm-wisely, as
pointed out previously, it may be difficult to contribute.
Still, as i know,
recently some researchers are working on the following
topics related to motion
estimation/compensation: 1) multiple reference frame motion
compensation. 2) sub-pixel motion estimation/compensation
(1/4, 1/8 etc.). 3) var

d*s2001-02-21 08:02

4 楼