[M4IF Technotes] Global Motion Compensation

[Patrick Ng]

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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