[MINC-users] mincblur with FWHM <= voxel dims

[Alex Zijdenbos]

True that padding 1 voxel all around also makes the problem go away;
however the egge "touchiness" of these two is really quite similar so
it's still not clear to me what sets this off. But then I do also tend
to pad images in registration pipes but not always; and I hadn't
actually seen this behaviour before. Good to know :)

Thanks,

-- A

On Thu, Jun 28, 2012 at 3:15 AM, Andrew Janke <a.janke at gmail.com> wrote:
> You'll find that this is because the second image (69) has been
> cropped aggressively. If your image "touches" the edge then the way
> that mincblur works will cause this effect.
>
> I tend to autopad all input images to such registration pipes for this
> (And other) reasons.
>
>
> a
>
> On 28 June 2012 01:15, Alex Zijdenbos <zijdenbos at gmail.com> wrote:
>> These are two virtually identical images with the standard 1mm stx sampling (top two rows); the third row is the difference between them (simple subtraction); and the 4th and 5th rows are the result of mincblurring each of them with an 8mm FWHM kernel. For some reason, the blurred result of (only) one of the two produces a strong edge artifact.
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