[Insight-users] setting parameters for GaussianBlurImageFunction

[Phillip Cheng]

Thanks Luis!  I appreciate your help, and I hope you're getting some kind of
break during the holiday season!

I think it would also make sense to add Get/SetUseImageSpacing (or
SetUseImageSpacingOn/Off) to GaussianBlurImageFunction as well.

Thanks,

Phillip

> -----Original Message-----
> From: Luis Ibanez [mailto:luis . ibanez at kitware . com]
> Sent: Thursday, December 25, 2003 8:22 PM
> To: Phillip Cheng
> Cc: insight-users at itk . org
> Subject: Re: [Insight-users] setting parameters for
> GaussianBlurImageFunction
>
>
>
> Hi Phillip,
>
> I see your point now.
>
> You are right, the class is fixing the values of
> the m_MaximumKernelWidth and the m_MaximumError
> on the constructor and does not have Set/Get
> methods for these two member variables.
>
> This has been entered as Bug # 464
> http://www . itk . org/Bug/bug . php?op=show&bugid=464&pos=0
>
> The solution seems to be to simply add Set/Get
> macros for these two member variables. It shouldn't
> take too long to fix this.
>
> The possible lateral effects remain to be seen...
>
>
> Regards,
>
>
>    Luis
>
>
> -------------------------
> Phillip Cheng wrote:
> > Hi Luis,
> >
> >
> >>The way to solve the warning is not to increase
> >>the tolerance on the error, but to increase the
> >>size (in pixels) of the kernel.
> >
> >
> > Yes, but as you point out, large kernels will increase computation time
> > (especially since I'm working with 3D images).  I think a
> tolerance of 0.001
> > will result in kernel sizes that are too large for my current needs.
> >
> > Incidentally, it's not documented what units SetExtent() is supposed to
> > take.  From the code it looks like it's in multiples of sigma
> (rather than
> > units of pixels or distance)?
> >
> >
> >>Just out of curiosity:
> >>What is your criteria for selecting the sigma at each pixel ?
> >
> >
> > The sigma I'm using depends on corresponding neighborhood
> information from a
> > segmented registered image.  This is part of some exploratory
> research for
> > partial volume correction on PET images.  The exact method of
> determining
> > sigma is part of the research question...
> >
> > Phillip
> >
> > _______________________________________________
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> > Insight-users at itk . org
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> >
>
>
>