[Insight-developers] Curves 2D Extractor

[Luis Ibanez]

Hi Javier,


The Hessian is computed here by using a chain
of RecursiveGaussianImageFilters.


Please look at the file:

   InsightApplications/Curves2DExtractor/
                           ceExtractorConsoleBase.cxx

in lines 106-108:

   m_Eigen->SetInput1( m_H2x->GetOutput() );
   m_Eigen->SetInput2( m_H1xy->GetOutput() );
   m_Eigen->SetInput3( m_H2y->GetOutput() );

The filter:

   m_H2x  produces the second derivative  with respect to X
   m_H2y  produces the second derivative  with respect to Y
   m_H1xy produces the cross  derivatives with respect to X and Y


For more details on the pipeline that computes the Hessian
compoenents, please look in the same file at lines: 42 to 85.


    Regards,


        Luis



-------------------------
Javier Jaramillo wrote:
> Hi, I'm new to ITK.
> I was checking out some of the examples, and this one (Curves 2D 
> Extractor) got my attention. In the README it says that: "The extraction 
> method is based on the computation of the Hessian matrix".
> I've been looking at the code for a couple of days now, to find out how 
> the Hessian Matrix is computed, with no success.
> 
> Any idea? is there some documentation on how to do it? (I mean, how does 
> it internally works)
> More than just _using_ the ITK classes, im interested in knowing how 
> they works in general terms.
> Could you provide some snippets of code?
> It would be greatly apprciated
> Javier J. Jaramillo...
> 
> 
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