[Insight-users] Image Registration Metric Derivative Calculation

[Luis Ibanez]

Hi 田光建

Yes, if you are creating a new metric, you must
derive it from itk::ImageToImageMetric, you should
implement the method

             GetValue( parameters )

and you need to implement the methods:


            GetDerivative( parameters )

and

            GetValueAndDerivative(...)

Please take a look at other metrics, for example,
the MeanSquaresImageToImageMetric would be an
easy example to follow.


   Regards,


      Luis


-------------
田光建 wrote:
> Thank you for your answer, Luis. If I want to develope my own special 
> image metric, I need to calculate the derivative. What should I do? 
> Should I derive my own class from itk class and override the 
> GetDerivative() and GetValueAndDerivative()?
> 
>  > Date: Wed, 23 Jul 2008 10:29:29 -0400
>  > From: luis.ibanez at kitware.com
>  > To: gjtian at hotmail.com
>  > CC: insight-users at itk.org
>  > Subject: Re: [Insight-users] Image Registration Metric Derivative 
> Calculation
>  >
>  >
>  > Hi 田光建,
>  >
>  >
>  > Simply call the method
>  >
>  >
>  > GetDerivative()
>  >
>  > or
>  >
>  > GetValueAndDerivative()
>  >
>  > on the metric that you are using.
>  >
>  > It will return an array with the values of the derivative
>  > of the Metric with respect to the transform parameters.
>  >
>  > Regards,
>  >
>  >
>  > Luis
>  >
>  >
>  > ------------------
>  > 田光建 wrote:
>  > > Hi,All
>  > >
>  > > I want to know how to calculate the metric derivative in ITK for
>  > > registration. We assume that the first order derivative of the image
>  > > metric with respect to the transformation parameters, I want to 
> know how
>  > > to calculate it?
>  > >
>  > > Thank you all.
>  > >
>  > >
>  > > _______________________________________________
>  > > Insight-users mailing list
>  > > Insight-users at itk.org
>  > > http://www.itk.org/mailman/listinfo/insight-users
> 
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