[M4IF Technotes] Global Motion Compensation

[Prabhudev Hosur]

Global Motion CompensationPatrick,
Please note that Sprite is not a video object.  Instead, Sprite is a
VOP_coding_type (or a Tool).
Sprite can be static or GMC.  If the sprite is of type GMC (i.e., S(GMC) ),
then global motion compensation is required.
Advanced Coding Efficiency can support S(GMC), therefore it needs to include
global motion compensation.
Prabhu
  -----Original Message-----
  From: technotes-admin   lists.m4if.org
[mailto:technotes-admin   lists.m4if.org]On Behalf Of Patrick Ng
  Sent: Monday, October 29, 2023 12:19 PM
  To: MPEG4 technical notes (E-mail)
  Subject: [M4IF Technotes] Global Motion Compensation
  Dear MPEG4 Experts,
  Is Global Motion Compensation (GMC) a visual tool applied to Sprite video
object only?  If the answer is "yes", why in Table V2-39 the Advanced Coding
Efficiency Profile needs to support Global Motion Compensation while it does
not have to support Sprite object?
  In the MPEG-4 spec. (ISO 14496-2), GMC decoding is in Section 7.8.7 which
is under the section of 7.8 (Sprite decoding).  That leds me to think that
Global Motion Compensation is for Sprite video object only.
  Thanks
  Patrick Ng
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