<div dir="ltr">Well, there is a jacobian filter available in ITK that calculates the jacobian of displacement field (vector) image volume: <a href="http://www.itk.org/Doxygen/html/classitk_1_1DisplacementFieldJacobianDeterminantFilter.html">http://www.itk.org/Doxygen/html/classitk_1_1DisplacementFieldJacobianDeterminantFilter.html</a><div><br></div><div>It returns the jacobin determinant, but one can easily modify it to return the Jacobian matrix, and then do the eigen value analysis on top of that.</div><div><br></div><div>Cheers</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Oct 6, 2015 at 7:09 AM, Jakob Weiss <span dir="ltr"><<a href="mailto:weissj@in.tum.de" target="_blank">weissj@in.tum.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Thank you a lot Matheus, this has been very helpful!<br>
<br>
As to the question of using the Jacobian: Since the Hessian s the same as<br>
the Jacobian of the Gradient, this just another equal formulation of the<br>
same problem. I could not find any filter for computing the Jacobian on a<br>
vector volume either, so not really a solution. For example [1] applies a<br>
scheme to make these matrices symmetric.<br>
<br>
Cheers,<br>
J<br>
<br>
[1] Goch, Caspar J., et al. "Liver vessel segmentation using gradient vector<br>
flow." Bildverarbeitung für die Medizin 2011. Springer Berlin Heidelberg,<br>
2011. 104-108.<br>
<br>
<br>
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