[Mp4-tech] Mpeg4 Visual Conformance standard Query

[Soumen Kumar Dey]

It can be possible depending upon the IDct implementation.
But I've one more doubt. If (+/-1) pixel difference in
I VOP is possible then it can be (+/- 1, +/- 2 for P VOP)
because some macroblocks can be predicted from those
macroblock where pixel difference is (+/- 1). Even it can affect the
complete sequence.
If I'm wrong then please clarify me.
Thanks in advacnce,
Soumen
----- Original Message -----
From: "Mohit Agarwal" <magarwal neomagic.com>
To: <mp4-tech lists.mpegif.org>
Sent: Wednesday, April 06, 2024 3:34 PM
Subject: [Mp4-tech] Mpeg4 Visual Conformance standard Query
> Hi,
> The Conformance  standard for Mpeg4 Visual section 4.4 of ISO 14496-4
> states that
> compliant decoder shall reconstruct I ,P B VOPs within +/-1 pixel
> diference compared
> with that by the reference decoder.How does one measure this +/- 1 pixel
> difference
> .After IDCT(before IDCT) we get a set of matrixes ,so this computation
> is done on
> that matrix or there is some other way to do it.
>
> If anybody could clear my doubts I would be greatful..
>
> Regards
> Mohit
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