Re: Re: Re: MMX version of 4x4 Forward Transform

oops, I've missed this post.

<[email protected]>
Re: Re: [Hdot264-devel] MMX version of 4x4 Forward Transform

There is a right shift in the 4x4 Transform.
For QP higher than 6, all coefficients are scaled by multiple of
four, and the order of directions does not matter.
This is not true for lower QPs.
Luca.
----- Original Message ----- 
From: Aitor Garay 
To: [email protected] ; [email protected] 
Sent: Monday, March 31, 2003 1:56 PM
Subject: Re: Re: [Hdot264-devel] MMX version of 4x4 Forward Transform


    Why that emphasis on _first_ vertical, and _then_ horizontal?  I'm not a matrix expert, but i
have checked and the order seems not to affect the result.  The dynamic range of the intermediate
values should be the same, so it is not an accuracy issue.

    /AITOR

----- Original Message ----- 
From: [email protected] 
To: [email protected] ; [email protected] 
Sent: Monday, March 31, 2003 12:24 PM
Subject: Re: Re: [Hdot264-devel] MMX version of 4x4 Forward Transform




<[email protected]>
Re: [Hdot264-devel] MMX version of 4x4 Forward Transform

For those who are working on MMX transform, please pay attention to a (new) clarification in the latest draft.
Section 8.5.8 (where the transform is defined), first the vertical transform should be applied, then the horizontal.
enjoy




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