[M4IF Technotes] Independent Segment Coding

[Stathis Voukelatos]

Hi Lucia,
In MPEG-4 this is implemented by the video packet error 
resilience tool. AC/DC prediction and motion vector prediction
are reset on video packet boundaries, in the same way as in frame
boundaries. 
In the DC prediction case for example, if one of neighbouring DCT blocks
used to form the prediction does not belong to the same video packet as the
current block then its DC value is not used, but instead the value
of 1024 is used in the prediction process (which is the DC value for
mid-grey).
Stathis
Stathis Voukelatos, PhD      
Software Engineer       
IndigoVision Ltd     
The Edinburgh Technopole
Bush Loan, Edinburgh
Scotland, UK
EH26 0PJ
+44 (0)131 4757345      
+44 (0)131 4757201 (Fax)  
http://www.indigovision.com
> -----Original Message-----
> From: Lucia [mailto:valentini   coritel.it]
> Sent: Monday, April 07, 2024 11:02 AM
> To: Technotes
> Subject: [M4IF Technotes] Independent Segment Coding
> 
> 
> 
> Hi everybody,
> 
> does anybody know if in MPEG4 it is implemented 
> the "independent segment coding" as in H263?
> (i mean confining spatial prediction by not predicting DCT coeff.
> and Motion vectors from adiacent Macroblocks in a frame, but sending 
> their absolute value)
> 
> Thanks in advantage
> Lucia
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