[Insight-users] use of itkKappaStatisticImageToImageMetric

[Karthik Krishnan]

So is the GetDerivative() method that exists in the metric now 
non-functional ? Is it not possible to have one implemented via finite 
differences ?

Thanks
karthik

Miller, James V (GE, Research) wrote:

>The Kappa statistics image metric does not compute derivatives wrt to the 
>transform parameters.  We a researcher take a look at it but it has not 
>been completed.
>
>You will need to use an optimizer that does not rely on gradients.  The
>AmeobaOptimizer and the OnePlusOneEvolutionaryOptimizers are candidates.
>
>You will also need to use a NearestNeighbor interpolator.
>
>Jim
>
>-----Original Message-----
>From: insight-users-bounces+millerjv=crd.ge.com at itk.org
>[mailto:insight-users-bounces+millerjv=crd.ge.com at itk.org]On Behalf Of
>mhg at unizar.es
>Sent: Tuesday, February 07, 2006 5:38 AM
>To: insight-users at itk.org
>Subject: [Insight-users] use of itkKappaStatisticImageToImageMetric
>
>
>Hello,
>
>I am trying to implement a registration method for binary images that uses the
>Kappa Statistic Metric. I wrote a standard program with this metric and a
>gradient descent based optimizer. 
>
>When I run my program, it tells me that this metric does not provide metric
>derivatives, so I guess that I should use another optimizer and maybe another
>interpolator.
>
>Could some of you tell me the correct combination for this metric?
>
>I would like also to know if there is any place where I could find the correct
>combinations for metrics, interpolators and optimizerd implemented in itk.
>
>Thanks in advance, 
>Monica. 
>
>
>
>
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