title: Drawing circles around image pixels with different radius
body: <p>I'm implementing the scale invariant feature transform algorithm... The entire point of the algorithm is to pinpoint on an image a set of features that can be used in further post-processing. I've succeeded into finding a vector that contains the key points and their co-ordinates in the form[x1co-ordinate y1co-ordinate circle1radius x2co-ordinate y2co-ordinate circle2radius..... N]</p>
  
  <p>My objective is to draw a circle around those pixels... I tried using rectangle('curvature' circle1radius circle1radius) however I can't draw the ellipse around a certain point... Any suggestions? :)</p>