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Question : Meyer-type wavelets
 
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Sumit Kumar (Lifting Steps)
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PostPosted: Wed Aug 13, 2003 8:18 pm    
Subject: Re: Question : Meyer-type wavelets
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Hey Laurent :-
I have my Image coding code ready, Would you by any chance be having the lifting coefficients of this particular wavelet ?. If yeah, then can u provide them to me... I will fit them into my program and get back to you with a comparison of performance !
Cheerz
Sumit Kumar (Poof !)
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PostPosted: Thu Aug 14, 2003 8:58 am    
Subject: Re: Question : Meyer-type wavelets
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I guess I have to back off icon_biggrin.gif
.. Why do ppl talk abt FIR filters and not IIR filters ?.. Simple, they can be mathematically implemented and explained, physically implementing them.. I dont think we have the technology for actually implementing them, in a convenient manner that is possible with FIR filters !

If I am not mistaken, there was a research paper, that talked abt performing image compression with IIR wavelet filters ! I cant get the reference off hand, but I am sure it was from somewhere in europe (Holland or Belgium !)
Sumit Kumar (Possibility)
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PostPosted: Thu Aug 14, 2003 9:04 am    
Subject: Re: Question : Meyer-type wavelets
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Umm Laurent
I think, due to the symmetric nature of the wavelet filter set, once can get efficient lifting steps, akin to that of the 9-7 filter set.
I think C.Valens has written a C-code which he claims gives us the lifting steps for symmetric filters. Maybe you can try to get those lifting steps.
Of cos, multiplying them in the Fouriér domain is mathematically easy, but again you have implementation problems due to complex-numbers !
Sumit Kumar (snath@site.uottawa.ca)
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PostPosted: Thu Aug 14, 2003 7:21 pm    
Subject: Re: Question : Meyer-type wavelets
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What abt artifacts due to truncation of the filter coefficients ?.. the so called windowing effects ?.. I thought that was a problem with IIR filter design ( at least thats what i have been exposed to in my DSP lessons ) icon_biggrin.gif
Sumit Kumar (snath@site.uottawa.ca)
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PostPosted: Fri Aug 15, 2003 6:18 pm    
Subject: Re: Question : Meyer-type wavelets
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Umm,
I dunno abt speed, but accuracy is surely improved. The whole point of lifting based transforms, is to convert a floating pt number to an integer by rounding. There has been a work, exploring the aspects of this with regards to image coding using any embedded technique. From my simulations, I can say that the perceptual image quality degrades if one goes from floating pt numbers to rounded integers, at each lifting stage !

*ps :- sorry for the late reply.. Am caught up in the BLACKOUT zone icon_biggrin.gif
Unable to do Lifting (snath@site.uottawa.ca)
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PostPosted: Thu Aug 21, 2003 4:53 pm    
Subject: Re: Question : Meyer-type wavelets
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Hi Laurent,
Unfortunately I am unable to obtain the lifting steps for this wavelet filter set. Thats cos.. I am unable to divide YOU icon_biggrin.gif (umm I mean I am unable to perform a long division on the Laurent Polynomials !)

At least thats what I have found, from the filter set obtained from the MATLAB
>>[a,b,c,d] = wfilters('dmey') command

Can you provide some insight into this ?..
Oxisserrica (donovana.nthoni8@gmail.com)
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