Hi,
As Ben said, nearest neighbour is as close as you can get to
no interpolation. It uses the intensities from the original image
without changing them, so I don't know what else you could
want. If you actually want resampled images to be similar
from different sources then I would actually recommend
interpolation such as spline. This is what we use for averaging
structural images that have been resampled into the same
space.
All the best,
Mark
On 6 Oct 2011, at 19:42, Woodman, Sandra wrote:
> Yes. We are using this now. But is there a way to have no interpolation
> whatsoever done on the data? (individual subject). We are comparing two
> different sessions and would like the images to be as similar as possible.
>
> Also is it correct that trilinear is the default?
>
> Thank you for your help!
>
> Sandra
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> -----Original Message-----
> From: FSL - FMRIB's Software Library on behalf of Benjamin Kay
> Sent: Thu 10/6/2011 2:19 PM
> To: [log in to unmask]
> Subject: Re: [FSL] applywarp --interp default, how to shut off??
>
> On Thursday, October 06, 2011 14:13:04 you wrote:
>> Hello FSL world,
>>
>> We are using the applywarp command to make an affine transform from one
>> session to another. Can you use 'applywarp' without using the
>> interpolation (--interp) flag? If you do not specific a --interp flag
>> does it do the default, which is trilinear correct? Or with the --interp
>> left off, will no interpolation been done? Is there a way to set up the
>> command line so that you force no interpolation?
>
> If you use --interp=nn you will get nearest neighbor interpolation, which is
> probably what you mean by "no interpolation".
>
>
>
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