Accessing pixel values

[Charles Law]

<x-flowed>At 05:44 PM 9/1/99 -0400, Anthony Sacramone wrote:
>I am using vtkImageReader to read in an entire
>volume from a series of 2-D slices (1byte/pixel).
>
>How would I access the raw pixel data ???


from C++ in VTK version 3.0 :

reader->Update();
reader->GetOutput()->GetScalarPointer(x, y, z);

It is also possible to access the raw data from Tcl.  I believe the method is:
vtkImageData::GetScalarComponentAsFloat(x, y, z, component);


>It is segmented into one "blob" or region per slice.
>I would like to find the center of mass of each blob.

I don't think there is a filter that can do this.  vtkMassProperties is the 
closeset, but I believe it only works on triangular meshes, and I don't 
think it computes center of mass.  A vtkImageMassProperties filter that 
computes center of mass would be easy to write.

Charles.






>Thanks in advance.
>
>-ANTHony
>_____________________________________________________
>Anthony Sacramone     Image Recognition Systems Group
>C.S. Draper Labs      Phone: 617-258-4206
>555 Technology Sq     FAX:   617-258-2555
>Cambridge, MA 02139   email: asacramone at draper.com
>
>
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