[ITK-users] [ITK] Geodesic Active Contour with Shape Guidance Parameters

[Timothee Evain]

Hello,

Quote from the ITK book right beside the code snippet that troubles you (at least in my book version, i.e. 4.5):
"Before starting the segmentation process we need to also supply the initial best-fit shape estimate.
In this example, we start with the unrotated mean shape with the initial x- and y- translation
specified through command-line arguments."

So startx and starty are the initial translation (of shape model) parameters that are given as the optimizer initialization.
The other parameters are the rotation and the principal component multipliers as explained earlier in the example.

About the influence, it highly depends on the scale parameters. 
If you gave them a high scale value relative to others, they are likely to stay stable during the optimization.

HTH,

Tim


----- Mail original -----
De: "Robert" <scorpiuni at gmail.com>
À: insight-users at itk.org
Envoyé: Mercredi 18 Mai 2016 15:38:44
Objet: [ITK] [ITK-users] Geodesic Active Contour with Shape Guidance	Parameters

Hello,
I was trying out the Geodesic Active Contour with Shape Guidance example
from the ITK book, but I can't get the same result as described in the book.
There is a parameter called "startx" and "starty" that you need to provide.
This isn't explained in the text. How do I need to choose those parameters,
and what do they mean/influence? I tried a few different ones, but I don't
see any influence, however my "final parameters" result is different than in
the book. Also, my output image looks wrong in the sense that it is not
rotated at all, it does not seem to find the right spot in the image.... 
Could anyone explain those parameters to me?




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