They are unweighted. In theory, you can get a better gaussian
approximation if you weight, but I don't know of a weighting scheme that
works all that well. I've implemented Moo's heat kernel smoothing and
was not happy with the results (also see a NI paper by Don Hagler
dealing with the HK shor
Hi Doug,
Thanks for your speedy answers to both my smoothing questions. Can I
trouble you one more?!
Are the connected-neighbour smoothing iterations unweighted averages,
or weighted in some way? I'd guess that the approximation to Gaussian
smoothing would be better if there was something like th
Your 2nd description is correct. Note that the value of vertices outside
of the mask are NOT changed (ie, they are not set to 0).
doug
DRC SPM wrote:
> Dear FreeSurfers,
>
> Please can you explain how mri_surf2surf's --cortex option for
> smoothing is implemented?
>
> I assumed it would be along
Dear FreeSurfers,
Please can you explain how mri_surf2surf's --cortex option for
smoothing is implemented?
I assumed it would be along the following lines:
- mask the data to zero-out the medial wall
- smooth this masked data
- smooth the mask itself
- divide the smoothed data by the smoothed
