[Insight-developers] The {Binary|Ternary}FunctorImageFilter problem.

[Luis Ibanez]

Hi Kent,

On Thu, Jun 2, 2011 at 10:49 AM, Williams, Norman K
<norman-k-williams at uiowa.edu> wrote:
> I feel like I saw I way to implement what Hans was asking for, and
> foolishly I thought that adding the functionality near the base of the
> inheritance hierarchy was actually a win -- it added new functionality to
> a whole family of classes, without changing their behavior for existing
> cases.
>
> It has turned into a big mess. Partly that was my fault, because I was
> doing something that was a bit tricky internally.  I also pushed it up to
> Master based on limited feedback and without much testing on compilers
> aside from gcc.
>


I also have to share the blame here,
since I approved that original patch
and missed to see the implications
that Brad L. pointed out yesterday.


> So I guess what Luis is proposing is this:
>
> 1. Back out the changes I made. That means reversing this patch:
>   http://review.source.kitware.com/#change,1725
>

Yes,
This is what is being proposed in this patch:
http://review.source.kitware.com/#change,1777


> 2. Add space checking to the existing functions, at the
>   {Binary|Ternary}FunctorImageFilter level. Throw exception
>   if spaces don't match to a tolerance.
>

Yes,

and... also

a) Adding unit tests for these classes.

b) Moving the UnaryFunctorImageFilter from ITK-Common
     to ITK-ImageFilterBase so, they are all together in the
     same directory (Unary,Binary,Ternary).


> 3. Start a new, parallel tree of functor filters.  Probably needs to be
>   in its own, new module?  What is it called?
>


Not sure about whether they need a new module,
but certainly a new hierarchy is desirable.


> Forgive me, Luis if I'm mis-representing what you've said.
>

You got it all right.

> I also think Hans is right, in that the existing system behaves in
> surprising, incorrect ways for medical imaging. Here at Iowa we have a lot
> of experience with using and teaching ITK at the undergraduate, graduate
> and professional levels. Part of the steepness of the learning curve is
> avoiding pitfalls that arise from the pitfalls associated with physical vs
> image space.
>
> But I want to be done with this controversy.  I can implement whatever
> consensus solution is decided on.
>
>
>
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