[M4IF Technotes] Question of MPEG4

[liuxiaolei vip.sina.com]

> > Dear MPEG4 Experts,
> > 
> >   In the MPEG-4 spec. (ISO 14496-2), Sprite decoding is in 
> > Section 7.8 .We know Sprite decoding is decoding for 
> > S(sprite)-VOP and the sprite decoding process is :
> >    I-vopBitstream,Shape/TextureDecoding,Sprite Buffer;
> >    S-VOPBitstream,Shape/TextureDecoding,
> >                   Warping Vector coding,Warping,Reconstructed 
> > Samples;
> >    Now my question is: 
> >          What is Warping and Warping Vector?
> >          Why used warping?
> >   I hope receive result,very thanks!
> > 
> >   Thanks
> >   Xiaolei Liu
> > 
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