[Insight-developers] What is LINEAR_INTERPOLATOR_FIXED?

[Luis Ibanez]

Hi Tom,


The linear interpolator in the Code/Review directory has a bug.
Currently, it doesn't produce the same results as the linear
interpolator in Code/Common.


When you enable that CMake flag, you should see a test failing...


We should fix its behavior before we rely on this code.



     Luis



-----------------------
Tom Vercauteren wrote:
> Hi Luis,
> 
> I just realized that the optimized registration framework does not use
> the optimized linear interpolator. Apparently the optimized linear
> interpolator is not used at all. This is because of the following line
> in itkLinearInterpolateImageFunction.h:
> 
> #if defined( ITK_USE_OPTIMIZED_REGISTRATION_METHODS ) && defined(
> LINEAR_INTERPOLATOR_FIXED )
> #include "itkOptLinearInterpolateImageFunction.h"
> #else
> 
> Any reason for not having
> 
> #ifdef ITK_USE_OPTIMIZED_REGISTRATION_METHODS
> #include "itkOptLinearInterpolateImageFunction.h"
> #else
> 
> instead? I saw that this modification was done for ITK 3.6
> 
>   http://www.itk.org/cgi-bin/viewcvs.cgi/Code/Common/itkLinearInterpolateImageFunction.h?root=Insight&r1=1.36&r2=1.33&sortby=date
> 
> but the only commit message is
> 
>   ENH: Temporarily disabling the redirection of this interpolator to the
>        OptLinearInterpolateImageFunction class.
> 
> Should we proceed to re-enabling this functionality?
> 
> Regards,
> Tom
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