[Insight-users] Procrustes registration again

[Luis Ibanez]

Hi Imho,


You can use the VTK procrustes filter,

However, since procrustes already have the
point associations, (as opposed to ICP), its
computation is relatively fast. This makes
that the overhead of converting point sets
from ITK to VTK data structures may be
significant.

You may be better off implementing
procrustes in a native ITK way.

It depends on how much programming time
you can dedicate to this taks and how
much concerns do you have for performance.


Regards,

   Luis


------------------------

imho wrote:
> Thank you, as I use VTK and ITK together, I can try to use this class.
> The procrustes needs as you said some landmarks (3 minimum from each 
> model), and I think use it as first registration, to align imperfectly 
> the two models. I'll try to find 3 non-moving points.
> It may reduce the calculation costs for the others registration steps.
> 
> Luis > What do you think about this filter, if I put it in my pipeline? 
> (I already have VTK -> ITK -> VTK, I can add a VTK task in this)
> 
> thanks,
> imho
> 
> Rasmus Reinhold Paulsen wrote:
> 
>> On Fri, 4 Apr 2003, imho wrote:
>>
>>
>>> As I said to you before, I would like to implement a procrustes myself 
>>
>>
>>
>> If you would like to implement Procrustes in the ITK framework I would
>> recommend you to look at:
>>
>> http://www.vtk.org/doc/nightly/html/classvtkProcrustesAlignmentFilter.html 
>>
>>
>> for inspiration.
>>
>>
>>> (the registration steps I'd like to try : procrustes -> ICP -> one 
>>> deformable registration, maybe your demon's registration) , how could 
>>> I use your optimizer? Is it possible?
>>
>>
>>
>> I do not understand though how you would use Procrustes in a registration
>> task. It requires point correspondence? You would either need
>> manually annotated landmarks or some kind of prior registration of your
>> shapes generating semi-landmarks.
>>
>> Regards,
>> Rasmus
>>
>>
>>
>>
> 
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