[Insight-users] pixel data at world position

[Renaud Isabelle]

Hi all,
 
I have read an initial 3D image from a file with itkImageFileReader and displayed with VTK through vtkImageData/vtkImageActor.
 
Now, since a known world position in 3D x,y,z, I would like to retrieve the pixel value at this point of my image. 
 
This seems to be a complex problem, because I don't want the pixel data that is displayed at this position but the pixel data of the raw image, that is no rescaled instead.
 
Is there some example where such a thing is done? Or any function? 
 
Thanks, 
 
Isabelle
 
   
 
 

		
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