[Insight-users] Boundary Condition

[l franz]

Good afternoon everyone,

I'm trying to write an image filter in C++ with differents ITK tools. The 
filter is Susan filter. This filter already exists in C. To perfom the 
filtering, I have to enlarge the image. In the susan smooth filter in C, to 
enlarge the image, the program performs like this:

The image is composed of lines of pixels (a first line, a second line under 
the first one...). For exemple, to enlarged the top of the image, the C 
program copies the second line of pixel above the first one. Then it copies 
the third line above the copy of the second line (so, above the new line of 
pixel), ect...

The same is done to enlarge the bottom, left, right side of the image.

ITK gives differents tools to enlarge (Constant Boundary Condition, Periodic 
Boundary Condition and Zero Flux Neumann Boundary condition), but no one do 
what the C program do. Have I missed an ITK tool that I can use?? Or perhaps 
someone can advice me about a boundary condition for my work??

Thanks for all advice.

Regards,

François
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