[Insight-users] metaheaders

[Luis Ibanez]

Hi David,

The FastChamferDistanceImageFilter assumes that you are
providing as input an image representing a level set.

This image is supposed to have positive values and negative
values. An iso-surface (or iso-contour) is implicitly
defined at the value == 0.

The FastChamferDistanceImageFilter computes a signed
distance map from every pixel to the iso-surface == 0
of the input image.

Are you providing an input image with positive and negative
values ?



    Luis




--------------------------
David Macias Verde wrote:

> Hi all:
> 
> I'm working with the itkFastChamferDistanceImageFilter and I have
> modified a little bit the original code of
> itkFastChamferDistanceImageFilterTest.cxx just to test its way of doing.
> I've changed the released code by adding a itkImageReader, instead of
> letting the software make a proper image created by itself.
> 
> In order to check that change, I saved that proper image before doing
> the code modification. So when it was done, I read that proper data from
> a file and got the result, which became to be right. Like when it was
> self-created.
> 
> But, here it comes my trouble. As I'm working with DICOM images coming
> from a portal image device installed on Linear Accelerator (radiotherapy
> treatments), I moved every image into float format and stored them as
> raw. Using MetaImageImporter I created the .mhd needed to be ready with
> itkFastChamferDistanceImageFilterTest-modified. The result was that
> nothing change in the input image at all. The output data it came to be
> exactly equal to the input one.
> 
> What am I doing wrong?
> 
> Thanks,
> 
>