Re: [MPEGIF Discuss] Regarding AC/DC prediction

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Hi,

The direction for prediction is decided upon which one of the following
two difference values is less.

1) horizontal diff = Difference between dc coeff of top left neighbouring
block and dc coeff of top neighbouring block
2) vertical diff = Difference between dc coeff of left neighbouring block
and dc coeff of top left neighbouring block

if horizontal diff <= vertical diff direction wud be horizontal else its
vertical.

(DC coeff are inv quantised coeff)

I am not sure about the purpose of tables u r refering to. Perhaps few
others in this group could throw more light over this.

Regards,

Prashant

>
> Hi,
>
> In MPEG4 video i am having a doubt in the AC/DC prediction.In the
> momusys ref.code, for finding the prediction direction few tables are
> used which tells about the x &y   positions.These tables are  not
> available in the standard.can anybody tell the significance of the table
> or how the direction is calculated?
>
>
> Regards
> Sreeja
>
>
>
> _______________________________________________
> Discuss mailing list
> Discuss-wvgAS0I8NaWTm/[email protected]
> http://lists.mpegif.org/mailman/listinfo/discuss



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