[Insight-developers] Extrapolating vector images

[Tom Vercauteren]

Hi Kwame and Luis,

My feeling is that the ExtrapolateImageFunction should work with
vector images. If not, I would consider this to be a bug.

As far as I understand it, the "Vector" versions of the
Interpolate/ExtrapolateImageFunctions only exist for historical
reasons (lack of partial template specialization on VS6). Now that VS6
is gone, I'd rather get rid of all these "vector" classes as proposed
in the ITK 4.0 wish list:
http://www.itk.org/Wiki/ITK_Release_4/Wish_List#Image_Registration

Just to make my point, you may look at the
LinearInterpolateImageFunctionTest unit test that uses the standard
LinearInterpolateImageFunction to interpolate vector images:
http://github.com/Kitware/ITK/blob/master/Testing/Code/Common/itkLinearInterpolateImageFunctionTest.cxx

Kwame: If anything really forbids the use of vector images in
ExtrapolateImageFunction, could you please file a bug report:
http://www.itk.org/Bug/my_view_page.php

Thanks,
Tom

On Sat, Aug 28, 2010 at 22:04, Luis Ibanez <luis.ibanez at kitware.com> wrote:
> Hi Kwame,
>
>
> Great,
>
> I hope you are planning on submitting
> this code to the Insight Journal.
>
>
>      Thanks
>
>           Luis
>
> ------------------------------
> On Sat, Aug 28, 2010 at 2:54 PM, Kwame Kutten <kkutten1 at jhmi.edu> wrote:
>>
>> I've just finished doing that (See attached file)
>>
>> Thanks for your help.
>>
>> ----- Original Message -----
>> From: Luis Ibanez <luis.ibanez at kitware.com>
>> Date: Saturday, August 28, 2010 2:02 pm
>> Subject: Re: [Insight-developers] Extrapolating vector images
>> To: Kwame Kutten <kkutten1 at jhmi.edu>
>> Cc: insight-developers at itk.org
>>
>>
>> > Hi Kwame,
>> >
>> > I would think that you should  write a class
>> >
>> >      itkVectorExtrapolateImageFunction
>> >
>> >
>> > similar to the current
>> >
>> >      itkVectorInterpolateImageFunction
>> >
>> >
>> >
>> >
>> >     Luis
>> >
>> >
>> > -------------------------------
>> > On Sat, Aug 28, 2010 at 11:04 AM, Kwame Kutten <kkutten1 at jhmi.edu>
>> > wrote:
>> >
>> > > I've written some new image extrapolators
>> > > (ConstantExtrapolateImageFunction
>> > > and PeriodicExtrapolateImageFunction) derived from the
>> > > ExtrapolateImageFunction class template.  They work with scaler
>> > images but
>> > > will not accept vector images because the base class was designed
>> > for scalar
>> > > images (
>> > >
>> > >
>> > > Is there a way to modify the ExtrapolateImageFunction to work with
>> > > vector
>> > > images, or should I write a new vector-specific class (e.g.
>> > > ExtrapolateVectorImageFunction ) ?
>> > >
>> > > Thanks
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