[vtkusers] approach to overlay drawing on a 2D image

[Alexis H. Rivera-Rios]

Hi,

I will appreciate if someone can tell me an approach
to do the following:

I want to visualize the output of an image processing
algorithm which detects objets on an image.  After the
algorithm runs I want to draw the 2D gray scale input
image and colored circles around the detections.

Using vtkImageData, I'm able to draw the image.  But I
don't know what to do about the circles.  

I'd like to be able to add them as actors in the scene
so I can control their position.

I tried using the vtkImageCanvasSource2D, but I didn't
have any luck specifying the image.  

Has anybody done something similar?  Any ideas on how
to approach this problem?

Thanks,
Alexis

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