[x264-devel] Re: Hadamard transform

[Loren Merritt]

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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