[Insight-users] Newbie question: How to create polygons?

[Jazz Kartell]

Hi to everyone,

I'm completely new to ITK, so please be lenient toward me...
At the moment i'm very overhelmed with all the functionality included in 
ITK.

So here is what i want to do:

Input is a simple .png file including black filled forms on white 
background.
Goal is to extract these forms in seperate files (one for each form).
The extracted region should be included in a polygon with predefined 
amount of vertices.

Could you give me an advice, how i can enclose regions in polygons?

Thank you very much in advance

Best regards

Benjamin Kirchholtes