it uses a spherical parameterizations (longitude and colatitude) to
generate averages, then samples the results onto an icosahedron.
cheers,
Bruce
On Wed, 31
Jan 2007, XJ Kang wrote:
Hi,
I am trying to genearate average surface curvature map from ?h.sphere.reg.
One way I did is using make_average_subject. I got both volume and surface
avareges. I also created a surface using my own method: resample the surface
maps ?h.sphere.reg to a common spherical coordinates (th, phi), and calculate
the averages of all spheres. The average surface map I got is somewhat
different from the result of "make_average_subject". Can somebody tell me
the rough procedure of mris_make_average_surface?
As far as I know from the FreeSurfer docs, mris_make_average_surface averages
a set of surface coordinates and generate an average surface using Talairach
coordinates and spherical transform. For the spherical average, does it
resample the individual spheres to a common spherical coordinates and average
them?
Thanks.
XJ Kang
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