title: OpenCV - Access to pixels along the curve/path
body: <p>is there any way to access pixels along the specified curve/path in OpenCV?</p>
  
  <p>I've found LineIterator:
  <a href="http://opencv.willowgarage.com/documentation/cpp/core_drawing_functions.html?highlight=lineiterator#LineIterator" rel="nofollow">http://opencv.willowgarage.com/documentation/cpp/core_drawing_functions.html?highlight=lineiterator#LineIterator</a>
  but it's limited to lines. I would like to find something similar to LineIterator, but working with circles, since I need to read the pixels along the circle, or ellipse. </p>