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In this thesis, a real-time motion estimation(ME) processor for
videophone is proposed. The ME processor is multi-functional
.It can perform Full Search (FS) and 3-Step Hierarchical Search
(3SHS) to estimate the motion vectors. Users can select either
FS or 3SHS under the constraint for speed or accuracy. The size
of the the processing block is 8*8 pixels and the searching
area is 7 pixels around the reference block. In the ME
processor, we use the mean absolute error (MAE) as the matching
criterion. To enhance the throughput,the pipeline strategy is
used in the ME processor. The ME processor is constructed with
memory part, register part, MAE processor, address generation
part and control part. The ME processor operates image loading
and vector estimation concurrently and hence speed-up the
elapsed thime for the input of next estimated block. Under 1.2
um technology, the area of the motion estimation processor is
0.9 cm x 0.9 cm. The cored processing parts can achieve 20 MHz.
Th match the SRAM derived from the labortory, the system is
tuned down to 10 MHz. The simulation result shows that the
processing speed is 10 MHz.
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