title: how remove binary image noise in opencv?
body: <p>after convert image to binary image (black and white ) if there is any noise how can
  i remove that unwanted noise </p>
  
  <p>you can see below  image have some white noise inside the black area how can i remove noise 
  using opencv </p>
  
  <p><a href="http://img857.imageshack.us/img857/999/blacknoise.jpg" rel="noreferrer">http://img857.imageshack.us/img857/999/blacknoise.jpg</a></p>