[M4IF Technotes] Ac prediction

[Herpel Carsten]

The issue is: If this cannot be read unambiguously from the spec, a
Corrigendum should be made to remove this ambiguity.
Is it ambiguous from the written spec?
Regards,
Carsten
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| THOMSON multimedia -------------------------- CR Hannover |
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| Carsten Herpel                                            |
| Deutsche Thomson-Brandt GmbH                              |
| Karl-Wiechert-Allee 74           Tel.: +49 511 418 2510   |
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| Germany                        mailto:herpelc   thmulti.com |
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-----Original Message-----
From: Ramkishor Korada [mailto:ramki   emuzed.com]
Sent: 11 June, 2001 14:21
To: Jani Huoponen; technotes   lists.m4if.org
Subject: Re: [M4IF Technotes] Ac prediction
Hi,
 When the block is not Intra (Inter), then they should be handled the same
way as blocks outside VOP or packet i.e., use zero values as predictors.
warm regards,
ramkishor
Architect - Video
Digital Media Technology Division
Emuzed Bangalore Division
IndiraNagar,Bangalore
www.emuzed.com
----- Original Message -----
From: "Jani Huoponen" <Jani.Huoponen   hantro.com>
To: <technotes   lists.m4if.org>
Sent: Monday, June 11, 2023 9:48 AM
Subject: [M4IF Technotes] Ac prediction
> Hi all,
>
> There seems to be one vague point in the Visual standard regarding the AC
> prediction, I would like to have your opinion on the interpretation of the
> standard.
>
> So the question is:
>
> What values are supposed to use in ac prediction if type of the prediction
> block (block 'A' or block 'C') is not intra? Standard does not seem to
> impose any restrictions on usage of inter blocks as ac predictor blocks
but
> video verification model seems to specify that they should be handled the
> same way as blocks outside the VOP or video packet (i.e. use zero values
as
> predictors instead of actual inter block ac coefficient values).
>
> BR, Jani
>
> ------------------------------------------------------------
> Jani Huoponen
> Engineering Manager, System Design
> Hantro Products Oy
> Nahkatehtaankatu 2, 90100 Oulu, Finland
> +358-40-5272676
> ------------------------------------------------------------
>
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