Re: Wiki Wavelab

[Ken Simpson]

>Now for the next challenge: to compile the MEX files and watch the
>transform speed magically increase tenfold!

Actually, it turned out it was the installation of MEX files 
which created the previous problem.

I had forgotten I installed the MEX files in seperate directory 
in my path - which ended up masking the previous problem with the 
'reverse.m' file.

I have clean minimal install of Octave to which I've added

        dispatch.oct
        imread.m
        mex             (after changing the paths in the script) 

to the installation and renamed 'reverse.m' to 'wlreserve.m'.

Unfortantely, the problem still persists, namely, when trying to do 
perform an inverse WT, it appears perform a forward WT instead.

Also, I tried simple 1d problem using FWT_PO and IWT_PO with the 
MEX files installed, namely

        x=[1,1,1,1,1,1,1,1];
        qmf=MakeONFilter('Daubechies',4);
        [n,J]=dyadlength(x);
        wc=FWT_PO(x,J-1, qmf);
        ix=IWT_PO(wc,J-1, qmf);

The wavelet coefficients were correct but the inverse was broken 
too. 

It works correctly when the MEX files are removed.

This was as far as I got.

Any help debugging the would be greatly appreciated.

-- Ken



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