[Insight-developers] Why are the PadImageFilters so complicated?

[Jim Miller]

I expect the complexity is warranted.  But there is probably room to improve. I expect mirroring is the most complicated. While the operations of pad and mirror sound simple, to properly support streaming in these filters is pretty complicated. At is simpliest, for any request for a region on the output, the algorithm needs to map that region to the appropriate region on the input.

These filters were also written very early on in ITK history. There are probably a few concepts that were introduced afterwards that would have made those filters easier to write (things like line iterators and reverse iterators).

Jim

On May 25, 2011, at 6:00 PM, Cory Quammen wrote:

> Looking at the PadImageFilter subclasses today, I couldn't help but
> wonder why they are so complicated. There is a note in
> itkMirrorPadImageFilter.txx that says, "The algorithmic complications
> are necessary to support the streaming interface and multithreading."
> Is that still the case?
> 
> Thanks,
> Cory
> 
> -- 
> Cory Quammen
> Computer Integrated Systems for Microscopy and Manipulation (CISMM)
> Department of Computer Science
> University of North Carolina at Chapel Hill
> http://www.cs.unc.edu/~cquammen
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Jim Miller
Senior Scientist
GE Research 
Interventional and Therapy

GE imagination at work

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