[M4IF Technotes] Question of MPEG4

[Hagai Folkman]

Wraping represent the changes of the Sprite image in time.
Wraping vector represent the change from the last Sprite, the decoder
reconstruct
the Sprite image from the wraping vector.
The Wraping vector is 3x3 parametric matrix that represent linear movements
(like pan and tilt) or non-linear movements (like zoom or rotate).
The wrapping can be used to send still image and afterward to manipulate the
image,
or for sending the background of the video and change the background
according to
the camera movements.
Hagai Folkman,
----- Original Message -----
From: <liuxiaolei   vip.sina.com>
To: <technotes   lists.m4if.org>
Sent: éåí ùéùé 06 ãöîáø 2002 03:41
Subject: [M4IF Technotes] Question of MPEG4
>
> > > 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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