[Insight-users] about HessianRecursiveGaussianImageFilter

[Ivan Macia]

Hi,

The Hessian matrix, of type itk::SymmetricSecondRankTensor, is defined in
the filter as a matrix of real values, hence you can store positive and
negative floating point values. This is what you mean?

Iván

2010/6/28 savagegarden <suran.tju at gmail.com>

>
> 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 <insight-users-bounces%2Bimacia>=
> 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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> > Insight-users at itk.org
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> >
> >
> >
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> >
> >
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> >
>
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