[Insight-users] about HessianRecursiveGaussianImageFilter

[savagegarden]

Hi Iván,
Thank you for your codes.
However, I wonder how you store the Hessian matrix values? If you store as
an image intensity, how you deal with the negative matrix value？
Ran

Iván Macía wrote:
> 
> Dear Liu,
>  
> I made this code based on the Curves3DExtractor application (in
> InsightApplications). It performs eigenanalysis of the Hessian matrix and
> writes 3 images that correspond to the 3 eigenvalues (if nothing is
> wrong).
>  
> Hope that helps
>  
> Iván
> 
>    _____  
> 
> De: insight-users-bounces+imacia=vicomtech.es at itk.org
> [mailto:insight-users-bounces+imacia=vicomtech.es at itk.org] En nombre de
> SCHMID, Jerome
> Enviado el: jueves, 26 de enero de 2006 2:35
> Para: liu jianfei; ITK
> Asunto: RE: [Insight-users] about HessianRecursiveGaussianImageFilter
> 
> 
> 
> Dear Liu Jianfei,
> 
> Have a look in the last itk code ( cvs or release ) for the filter
> "itk::Hessian3DToVesselnessMeasureImageFilter" in files
> itkHessian3DToVesselnessMeasureImageFilter.h and
> itkHessian3DToVesselnessMeasureImageFilter.txx. It shows you how to
> perform
> most of the job: compute hessian then eigenvalues and finally compute some
> vesselness measure based on eigenvalues.
> 
> Best Regards,
> 
> Jerome Schmid
> 
> ---------------------------------------------
> Jerome SCHMID
> Project Manager / Engineer
> Augmented and Virtual Reality
> Minimally Invasive Surgical Skills Center (MIS)
> HYPERLINK "http://www.hkmisc.org.hk/"http://www.hkmisc.org.hk/
> Prince of Wales Hospital
> Chinese University Of Hong-Kong
> ----------------------------------------------
> 
> 
> 
> -----Original Message-----
> From: insight-users-bounces+jeromeschmid=surgery.cuhk.edu.hk at itk.org on
> behalf of liu jianfei
> Sent: Thu 1/26/2006 6:34 AM
> To: ITK
> Subject: [Insight-users] about HessianRecursiveGaussianImageFilter
> 
> 
> Hi, everyone
> 
>     I've pasted a message on this class. Just now, I checked that the
> number
> of output is 6 values. They should be the component of the hessian matrix.
> Can someone tell me the order of these values.
>     Ixx  Ixy  Ixz
>            Iyy  Iyz
>                  Izz
>     Is the order of these value Ixx  Ixy  Ixz Iyy  Iyz Izz? Thanks
> 
> 
>      Have a nice day!
> --
> Sincerly
> Jianfei Liu
> 
> 
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