[Insight-users] Demons registration stopping criteria

[elhadj meljane]

Dear Luke,
sorry I don't have an answer for your question, hope that you solved it or
someone will help ...
But I have a question related ...
I try to use  itkFiniteDifferenceImageFilter to iterate with
f_{n+1} = f_n +dt*A_n
and I dont know how to introduce the A_n in this filter, I guess is done
with ?
FiniteDifferenceImageFilter<..>::GenerateData()
{
...
this->ApplyUpdate()
...
}

is there an itk simple example of an implemntation of the ApplyUpdate() and
how to use it to iterate with this filter.

Thanks,
Elhadj,

On Fri, Apr 30, 2010 at 5:45 PM, Luke Bloy <luke.bloy at gmail.com> wrote:

> I'm curious about the stopping criteria used in the demons based
> registrations.
>
> From looking at itkFiniteDifferenceImageFilter::Halt() it seems that the
> stopping criteria are one of either 2 things.
>   1) the number of iterations exceeds some maximum.
>   2) the RMS_change is less then some MaximumRMSError.
>
> In the demons algorithm the RMS_change is defined as the average of the
> length of the update displacement field. Which seems to never decrease
> significantly.
>
> Am I correct that there is no stopping criteria based on the image
> similarity metric? If not what would be the most sensible way/place to add
> such a criteria? Is there any interest in having this functionality?
>
> thanks,
> Luke
>
>
>
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