[vtkusers] Multiscale Vessel Enhancement (vtkImageSeparableConvolution)

[matheus_viana]

Actually it is correct this way, since I'm interested in finding dxx, in this
example. So, we should take the second derivative in x-direction. I suppose
that when we want to obtain dxy, for instance, we should write it down like:

ConvolutionXY -> SetXKernel(FX_X); 
ConvolutionXY -> SetYKernel(FX_X); 
ConvolutionXY -> SetZKernel(FX);

Many thanks.
Matheus.

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