[Insight-developers] Image Derivatives - physical vs. index space

[Samuel Gerber]

Samuel Gerber wrote:
> Hi Luis
> <http://public.kitware.com/Bug/my_view_page.php>
>> The fix will come down to calling the image method:
>>
>>  inputImage->RotateArrayByDirectionCosines( gradient, rotatedGradient );
>>
>> after every computation of a derivative vector.
> I would assume, since the derivative is axis aligned in index space, 
> it could be simplified by only multiplying with the row corresponding 
> to the SetDirection setting in the itkDerivativeImageFilter.
>
>
>> In the meantime,
>> Could you use the itkGradientImageFilter, instead
>> of the DerivativesImageFilter for your application ?
> Yes I can use the gradient filter instead.
>
>
> Thanks
> Sam
>