[Insight-users] Bug in itkImageFunction / itkRayCastInterpolateImageFunction

[Luis Ibanez]

Hi Paul,

Thanks for pointing this out.

This topic was discussed among developers a while ago
and was pending on a performance evaluation.

What happens is that the RayCastInterpolator is the only
interpolator that relies on this function to be virtual.

Converting this method to virtual will incurr in some
performance penalty for all the other interpolators, in
a method that is called once per every pixel per every
iteration of the registration methods. This is a function
that is invoked millions of times during a registration.

Could you please log this as a bug/feature request in
the bug tracker ?

Just go to the following link

             http://www.itk.org/Bug/

create your account using your email, and then use the
option "Add a new Bug".

That will make sure that the issue gets attention during
the code reviews.


Please let us know if you find any trouble for filing
the bug report.


    Thanks


        Luis


------------------------------
Paul de Bruin wrote:

> I have been playing with DRRs in ITK and found that I could not get
> DigitallyReconstructedRadiograph1.cxx to work. Apparently, the problem
> is that
> the IsInBuffer method in ImageFunction that is overridden in the
> RayCastInterpolateImageFunction class is not declared virtual.
> Consequently, the wrong IsInBuffer method is called in
> ResampleImageFilter and ray casting fails for rays with begin and end
> points outside the volume.
> 
> Declaring the appropriate IsInBuffer method virtual in
> itkImageFunction.h solved this problem.
> 
> Regards,
> Paul de Bruin
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>