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I need to write class for Hadamard tranform and I want to include it to this library.

I will be very appreciative if sombody will help me.

Yes.

I study in university and must write a course project.

I choose theme "Multimedia Watermarking with Complex Hadamard Transform in the Inverse Pyramid Decomposition" when I found this:

http://pandora.compsci.ualr.edu/cpsc2382-01/papers/WM_Multimed_IRI'03.pdf

It's very interesting and I want to realise it.

But I can't find information about 2D-CHT. If you will see anything about, tell me please.

To do it, I must realise Hadamard transform, and I think it will be easier and better for me and for others if I write it in Iridium.

What do you think about? 

Yes, sound interesting indeed. I'm looking forward to integrate it in Iridium!

Btw, will such audio watermarks also survive a pitch filter?

Might the following link help for a start? Apparently you can implement Hadamard transform similar to the FFT transform (e.g. Cooley-Tukey approach) http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=414186&SiteID=1

Yes, implementing Hadamard transform similar to the FFT transform will be good.

But I have problem: I don't understand completely, how did you do FFT.

Maybe you can help me to understand, give some more information.

Have you read WM_Multimed_IRI'03.pdf? In that doc transform is maked by using complex numbers.

How shold I do it? You didn't use complex numbers in FFT, did it?