[vtkusers] Find Edge between Two Points

[Katya]

I am new to vtk. I need to find a way to detect an edge on an image.
Since the images that are used are very noisy, regular segmentation
methods do not produce desired results.

So a user would select four or more points on the edge of the object,
and the system needs to connect those points along the boundary. Are
there methods in vtk that could help me with this?

Thank you for your help.

Katya