[Theora-dev] Re: PC-based video server

[Timothy B. Terriberry]

Andrey Filippov wrote:
>   I just never thought there is a way to use coefficients form say 4 
> (2x2) blocks to build 1 block of twice lower resolution with small
> number of arithmetic operation. Yes, it should be so - that's a good
> idea - I just didn't understand it at once.

Sure, such techniques are well known. For example, see: 
http://www.hpl.hp.com/techreports/94/HPL-94-116.pdf