>> A couple demos:
>>
>> http://math.hws.edu/eck/math371/applets/Haar.html
>>
>> This is what's used in jpeg compression...
>
> No, I'm fairly sure JPEG uses the Discrete Cosine Transform.

http://en.wikipedia.org/wiki/Jpeg#JPEG_codec_example

Nice to know I'm right for once. ;-)

> Now
> JPEG2000 really *does* use some manner of wavelet transform (although I
> don't remember which one).

http://en.wikipedia.org/wiki/JPEG_2000#Technical_discussion

It's the Discrete Wavelet Transform (DWT).

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