[Insight-developers] partial derivatives at selected points

[Dan Mueller]

Hi Richard,

Have you looked at
    Review\GaussianDerivativeOperator
    Review\DiscreteHessianGaussianImageFunction
?

A word of warning: I think there is a problem with
GaussianDerivativeOperator for cases where spacing != 1.0 (which flows
onto the hessian function). I only get useful results if I call
SetUseImageSpacing( false ) on the hessian function.

Hope this helps.

Regards, Dan

2008/11/19 Richard Beare <richard.beare at gmail.com>:
> Hi,
>
> Is there anything available to compute first and second order partial
> derivatives at selected points. I know about the hessian filters, but
> these compute the derivatives at every point. I can't see how to
> achieve what I need with the derivative operator, in particular how to
> get $D_xy$ type terms. Am I missing something?
>
> Thanks
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