[Insight-users] periodic boundary conditions and recursive gaussian filter

[Jan Ehrhardt]

Hi,

is it possible to get periodic boundary conditions for the 
RecursiveGaussianImageFilter (or more general for
RecursiveSeparableImageFilters) ?
Specifically, I want to calculate the gradient (with a gaussian 
derivative) of an image with periodic boundary conditions in z-direction 
and neumann conditions in x/y-direction. In the next step, I want to 
apply gaussian smoothing to a N-dimensional vector-field with periodic 
boundary conditions in z-direction and neumann conditions in x/y-direction.

One idea is to reimplement RecursiveSeparableImageFilters and to enlarge 
the array given to FilterDataArray (..). But how many values I have to add?

Another small problem: the doxygen documentation don't lists all  
subclasses in the inheritance diagramm. How can I get a list of _all_ 
subclasses e.g. of the ImageToImageFilter ?

Thanks,

Jan