[Insight-users] Anisotropic Diffusion Filtering

[Pietro Nardelli]

Thank you very much for your help!

2012/5/15 lina septiana <livangellista at yahoo.com>:
> Hi Pietro,
>
>
> Actually the good combination depend on what the application you'll apply
> in. But maybe firstly, I suggest you to understand  the variable in the
> basic anisotropic diffusion by changing the integral constant, Kappa
> (threshold for gradient and noise level),and  iteration in the combination
> narrow and wide 1D signal, you will know how these parameters give the
> impact to the narrow and wide form signal.
> After you understand the characteristic of it, you may be able to design the
> appropriate anisotropic for your image. Then implement other combination
> anisotropic filtering.
> Below the link for the basic form anisotropic filter (perona malik) and
> biased anisotropic filtering (nordstrom) link for your reference.
>
> http://www.eecs.berkeley.edu/Pubs/TechRpts/1989/CSD-89-514.pdf
> http://www.cs.berkeley.edu/~malik/papers/MP-aniso.pdf
>
>
> ________________________________
> From: Pietro Nardelli <pie.nardelli at gmail.com>
> To: lina septiana <livangellista at yahoo.com>
> Sent: Tuesday, May 15, 2012 10:38 PM
> Subject: Re: [Insight-users] Anisotropic Diffusion Filtering
>
> Hi Lina,
>
> thank you for your reply. I've only tried the Curvature Flow
> anisotropic filter so far. Can you suggest some paper about the
> combination of anisotropic diffusion with other algorithms?If i
> understand correctly it's quite difficult to find an optimal method
> for al the cases.
>
> Thank you again,
>
> Pietro
>
> 2012/5/15 lina septiana <livangellista at yahoo.com>:
>> Hi Pietro,
>>
>> Anisotropic filter is one the good filter for image, but if you used the
>> traditional anisotropic difussion, it may obviously distorted the edge.
>> You can try another anisotropic diffusion such as Nordstorm (added with
>> the
>> bias) which may correcting the edge distortion but may be will increase
>> the
>> noise.
>> or try to combine anisotropic diffusion with other algorithm, there're
>> many
>> papers explain about it.
>>
>>
>> Lina
>>
>> ________________________________
>> From: Pietro Nardelli <pie.nardelli at gmail.com>
>> To: insight-users at itk.org
>> Sent: Tuesday, May 15, 2012 7:48 PM
>> Subject: [Insight-users] Anisotropic Diffusion Filtering
>>
>> Hi itk users,
>>
>> I need some advice. I'm trying to segment the airway of a lung from CT
>> Dicom datasets and the threshold connected library seems to be very
>> appropriate. I followed the example of the guide and I implemented it
>> into Slicer 4.1 and I can get good results. I have a doubt though: in
>> most cases I can obtain better results setting to 0 the number of
>> iterations of the smoothing variable, but sometimes a good smoothing
>> might be very helpful. So, I was wondering whether using another
>> anisotropic diffusion filter in place of the curvature flow presented
>> in the example could allow to obtain better results. Have you some
>> advice about the best filter I can use for CT Dicom images?
>>
>> Thank you for your help,
>>
>> Pietro
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>
>