[ITK-dev] 2D/3D registration in v4

[David Burns]

Dear Insight,

I am having the following trouble attempting 2D/3D registration of 
xray/CT with ITK v4 registration framework.

The basics: The moving image is a 3D volume, and the fixed image is a 2D 
projection. An interpolator calculates a synthetic cone-beam projection 
for the moving image (volume) and compares to the fixed 2D image.

The v4 registration framework doesn't allow me to use a 2D fixed and 3D 
moving image -> won't compile. So I need to setup the fixed image as 3D, 
even though it is 2D data. I can compile, but I get the following error 
at run time


ExceptionObject caught !

itk::ExceptionObject (0x20cfac0)
Location: "void itk::RecursiveSeparableImageFilter<TInputImage, 
TOutputImage>::BeforeThreadedGenerateData() [with TInputImage = 
itk::Image<float, 3u>; TOutputImage = itk::Image<float, 3u>]"
File: /usr/local/include/ITK-4.8/itkRecursiveSeparableImageFilter.hxx
Line: 245
Description: itk::ERROR: RecursiveGaussianImageFilter(0x2089fb0): The 
number of pixels along direction 2 is less than 4. This filter requires 
a minimum of four pixels along the dimension to be processed.

It seems this behavior does not occur in the v3 registration framework 
and 2D/3D registrations were possible, however, I want to take advantage 
of the threading features in v4. How would you suggest I proceed?


Thanks
David Burns