Douglas Douglas schrieb: > Hi everybody. > > I have a paper form that I scan into an image. My user fills some circles in > this paper form using black ink. Every form has ten rows with five circles > each > and the user fills only one circle for each row. > > I was wondering if I could use the Python Imaging Library to process these > forms. I know the Image class is really powerful, but I can't think of a way > of > how to locate wich circle was filled. > > Could anybody please give me an advice on this?
Depends on how much time you have... Google for "Hough Transformation", or look it up in a text book on image processing. That's a very general method for finding lines and circles. If you know where the circles are, comparing the average grey value inside the circle with the average of the environment should tell you if it's filled or not. -- http://mail.python.org/mailman/listinfo/python-list
