[vtkusers] ROI using vtkImageTracerWidget

[Dean Inglis]

Sercani:
 
You can get the vtkPolyData
of the vtkImageTracerWidget and get its bounds using, for example:
vtkPolyData poly = vtkPolyData::New();
widget->GetPath( poly );
double* bounds = poly->GetBounds();
 
from the bounds and knowing the underlying vtkImageActor's
input (vtkImageData) origin and  spacing, you can calculate
the enclosed region's extents and feed those into 
a vtkImageClip to clip the vtkImageActor's input:
 
double* origin = imageActor->GetInput()->GetOrigin();
double* spacing = imageActor->GetInput()->GetSpacing();
int xmin = (int)((bounds[0] - origin[0])/spacing[0] + 0.5);
int xmax = (int)((bounds[1] - origin[0])/spacing[0] + 0.5);
int ymin = (int)((bounds[2] - origin[1])/spacing[1] + 0.5);
int ymax = (int)((bounds[3] - origin[1])/spacing[1] + 0.5);
etc., etc.
 
vtkImageClip clip = vtkImageClip::New();
clip->SetOutputWholeExtent( xmin,xmax,ymin,ymax,zmin,zmax);
clip->SetInput(imageActor->GetInput());
 
 
Dean
 
>Isn't there anyone who did this before? I have implemented
>vtkImageTracerWidget example code to my project but i couldn't get the
image
>region inside this closed spline.
 

 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Dean Inglis, PhD

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~~~~ Center for Appendicular ~~~~~

Magnetic Resonance Imaging Studies

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610 - 25 Charlton Ave. E.

Hamilton, Ontario, L8N 1Y2

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Assistant Professor (Adjunct)

Department of Civil Engineering

McMaster University

Hamilton, Ontario

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Software Demos:

http://www.youtube.com/watch?v=_zYNtHC9-0s

 

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