title: algorithm for detecting a circle in an image
body: <p>I'm looking for an algorithm to detect circles in an image. The image is black and white. The background is white, and the circles don't overlap each other, or any other element in the image.
  The image includes some other shapes and some text.</p>
  
  <p>If there is some open source .NET library to do this, I would also like to know about it.</p>