[M4IF Technotes] Unrestricted MV in Simple profile?

[Herbert Thoma]

Biswajit Acharya schrieb:
> 
> Hi All,
> 
> Can you please explain how unrestricted MV can occur in a
> Simple profile (rectangular video) encoded bitstream.
> 
> I really can not understand how encoder would generate a
> motion vector pointing to a block in reference VOP lying
> outside the VOP boundaries. This may arise in case of
> non-ractangular shapes or for VOPs of different sizes.
> 
> However, though the specs. give it (Unrestricted MV) as a
> tool for Simple profile, this point is not clearly
> mentioned in the specs.

The motion vectors are unrestricted in the same way they
were already in H.263 (with annex D). If a vector points
outside the VOP the border pixels of the reference VOP
are repeated.
 Herbert.
> Hope you can explain this point.
> 
> Thank you,
> 
> Bach
> 
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-- 
Herbert Thoma
FhG-IIS A, Studio Department
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