[ITK-users] Metric Evaluation

[suneeza hanif]

Hello Richard,

I am using "HelloWorld" registration example with RegularStepGradienDescent
optimizer and MeanSquareImageToImage metric. At the end of registration
algorithm I want to compute metric value again using transform calculated
by the algorithm but I get different value as compared to the metric value
evaluated in last iteration.

Best Regards,
Suneeza



On Sat, Jan 2, 2016 at 6:48 PM, Richard Frank <rfrank at dominionsw.com> wrote:

> What optimizer/ algorithm  are you using?  Some use random selections of
> data as a speed optimization which on average give good results for better
> performance. But possibly slightly different results. If the differences
> are great then you might have to look at how you pick the first
> "guess"...how the images are pre-positioned prior to registration.
>
> Rick Frank
>
> Sent from my iPad
>
> > On Jan 2, 2016, at 12:00 PM, "insight-users-request at itk.org" <
> insight-users-request at itk.org> wrote:
> >
> > Send Insight-users mailing list submissions to
> >    insight-users at itk.org
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> >    http://public.kitware.com/mailman/listinfo/insight-users
> > or, via email, send a message with subject or body 'help' to
> >    insight-users-request at itk.org
> >
> > You can reach the person managing the list at
> >    insight-users-owner at itk.org
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Insight-users digest..."
> >
> >
> > Today's Topics:
> >
> >   1. Metric Evaluation (suneeza hanif)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Fri, 1 Jan 2016 23:17:36 +0100
> > From: suneeza hanif <suneezahanif02 at gmail.com>
> > To: insight-users at itk.org
> > Subject: [ITK-users] Metric Evaluation
> > Message-ID:
> >    <CA+-JtYVXHj_n4=0NDkv6Urmgqqh=8OUXiqDkw3DwNQq_Nni6Sw at mail.gmail.com>
> > Content-Type: text/plain; charset="utf-8"
> >
> > Hello Everyone,
> >
> > I need help regarding metric calculation. When I run registration
> algorithm
> > and use final results(e.g. rotation angle and translation) to calculate
> > metric once again at the end of process I get different value as compared
> > to the value of metric evaluated in last iteration. I am using same
> metric
> > for registration and later.
> >
> > I also did this after one iteration but i still i get different values.
> >
> > Does anyone know how to solve this problem?
> >
> > Thanks in advance.
> >
> > Best Regards,
> > Suneeza
> > -------------- next part --------------
> >
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/insight-users/attachments/20160107/bc67aba2/attachment.html>