CGAL users discussion list

["Laurent Rineau (CGAL/GeometryFactory)" <>]

Le mardi 09 octobre 2012 13:40:08 Hamid G a écrit :
> Hello,
> 
> I've been trying to use labellized_trilinear_interpolation() to get label
> values of a given point in an Image_3 object,
> and I haven't been successful.
> 
> To give you an example, let's say I want to find out the label for Point(0.,
> 0., 57.) in provided image stack "liver.inr.gz".
> So I took the code in examples/Mesh_3/mesh_3D_image.cpp and just added the
> following line after reading in the image in line 32:

[...] nabble forgot to send us your line. It was:
> int label = image.labellized_trilinear_interpolation(0., 0., 57., 0);

The word type of liver.inr.gz is unsigned char. So, use that:

unsigned char label = 
  image.labellized_trilinear_interpolation(0., 0., 57., (unsigned char)0);

That way, the template parameter Image_word_type, is automatically deduced to 
unsigned char, that is the type of the fourth parameter you pass to the 
function.

By curiosity, what are you doing using CGAL_ImageIO?

-- 
Laurent Rineau, PhD
R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
Release Manager of the CGAL Project       http://www.cgal.org/