[x264-devel] Again Hadamard transform

[Son Minh Tran]

Dear Loren Merritt,
I check the implementation of SATD in x264. It seems to me that the 
project uses SATD only to calculate the cost for block prediction. It 
does not use this transform in the hierarchical manner for the flat 
block of size 16x16, does it?
Please correct me if I am wrong
Regards
Son Tran

Loren Merritt a écrit :
> On Tue, 11 Apr 2006, Son Minh Tran wrote:
>
>> Dear All,
>> Would you please let me know if the hamadard transform is 
>> implemented  in x264, or only the DCT?
>> Thank you
>> Regards
>
> Yes, it is implemented. x264 usually calls it "SATD" for "sum of 
> absolute transformed differences".
>
> But "or only the DCT" is misleading. Hadamard is not part of the H.264 
> standard, and is not an alternative to DCT. It is an encoder-side 
> technique to improve speed and/or quality, and is also used in some 
> mpeg-1/2/4 encoders.
> (Well, hadamard is also part of the h264 intra 16x16 dc transform, but 
> asking whether that's implemented is meaningless; it's required.)
>
> --Loren Merritt
>

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