<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7654.12">
<TITLE>RE: [Insight-users] itkScalarChanAndVeseSparseLevelSetImageFilter - RMS Change</TITLE>
</HEAD>
<BODY>
<!-- Converted from text/plain format -->
<P><FONT SIZE=2>Hello Kishore,<BR>
<BR>
thank you for your answer. Let me clarify myself: I am currently just working on the sparse case. My problem is that I get very high values of RMS Change between<BR>
the iterations of the level set. As you said, RMS values are used for indicating the convergence of the evolution. I would expect them to be around lets say 0.1 near convergence but I get all the time very high changes during the evolution, RMS change values like 263450, meaning huge numbers.<BR>
Do you know why is this happening?<BR>
Thank you very much.<BR>
<BR>
Regards,<BR>
Eleni<BR>
<BR>
<BR>
-----Original Message-----<BR>
From: Kishore Mosaliganti [<A HREF="mailto:kishoreraom@gmail.com">mailto:kishoreraom@gmail.com</A>]<BR>
Sent: Tue 8/18/2009 9:07 AM<BR>
To: Sgouritsa, Eleni ; insight-users@itk.org<BR>
Subject: Re: [Insight-users] itkScalarChanAndVeseSparseLevelSetImageFilter - RMS Change<BR>
<BR>
Hi Eleni,<BR>
<BR>
I am back at work :).<BR>
<BR>
Ok, we made several corrections to the code in the past two months and you<BR>
can download the latest CVS version. Many thanks for your feedback on using<BR>
the code. It helped us identify bugs and clean up the code further.<BR>
<BR>
Your question was regarding the RMS Error values computed by the Dense and<BR>
Sparse filters on the same image producing different values.<BR>
<BR>
The dense filter works on the levelset function defined on the whole image<BR>
domain. As a result, the RMS values are computed on changes in the function<BR>
everywhere.<BR>
<BR>
The sparse filter works only locally to the 0 level-set (hence the name<BR>
sparse). The RMS values look at a small band of pixels. Therefore, the<BR>
values in this case are at a different range.<BR>
<BR>
Irrespective, the RMS values are used for indicating the convergence of the<BR>
evolution. Is there any reason why you want them to be at the same range ?<BR>
<BR>
Best,<BR>
Kishore<BR>
<BR>
On Mon, Aug 17, 2009 at 6:37 PM, Sgouritsa, Eleni<BR>
<esgourit@central.uh.edu>wrote:<BR>
<BR>
> Hello,<BR>
> I hope everything went well concerning the embassy.<BR>
> Do you have any updates for the high RMS values? Was this problem fixed?<BR>
><BR>
> Regards,<BR>
> Eleni<BR>
><BR>
><BR>
><BR>
> -----Original Message-----<BR>
> From: alex gouaillard [<A HREF="mailto:alexandre_gouaillard@hms.harvard.edu">mailto:alexandre_gouaillard@hms.harvard.edu</A><alexandre_gouaillard@hms.harvard.edu><BR>
> ]<BR>
> Sent: Thu 7/2/2009 2:32 PM<BR>
> To: Sgouritsa, Eleni<BR>
> Cc: insight-users@itk.org<BR>
> Subject: Re: [Insight-users] itkScalarChanAndVeseSparseLevelSetImageFilter<BR>
> - RMS Change<BR>
><BR>
> hi eleni,<BR>
><BR>
> Kishore has been release by the US embassy in India (without any<BR>
> ransom shall I had) and should be back in town july 9th.<BR>
><BR>
> We will adress this issue right after that and keep you informed.<BR>
><BR>
> thanks again for your feedback.<BR>
><BR>
> alex.<BR>
><BR>
><BR>
> On Jul 2, 2009, at 12:53 PM, Sgouritsa, Eleni wrote:<BR>
><BR>
> > Hello,<BR>
> > I still have a problem with very high values of RMS Change between<BR>
> > the iterations of the level set. Any help or direction on how to<BR>
> > solve this would be appreciated a lot.<BR>
> > Thank you very much.<BR>
> ><BR>
> > Best regards,<BR>
> > Eleni<BR>
> ><BR>
> > <ATT00001.txt><BR>
><BR>
><BR>
><BR>
> _____________________________________<BR>
> Powered by www.kitware.com<BR>
><BR>
> Visit other Kitware open-source projects at<BR>
> <A HREF="http://www.kitware.com/opensource/opensource.html">http://www.kitware.com/opensource/opensource.html</A><BR>
><BR>
> Please keep messages on-topic and check the ITK FAQ at:<BR>
> <A HREF="http://www.itk.org/Wiki/ITK_FAQ">http://www.itk.org/Wiki/ITK_FAQ</A><BR>
><BR>
> Follow this link to subscribe/unsubscribe:<BR>
> <A HREF="http://www.itk.org/mailman/listinfo/insight-users">http://www.itk.org/mailman/listinfo/insight-users</A><BR>
><BR>
><BR>
<BR>
</FONT>
</P>
</BODY>
</HTML>