title: Measuring distance between two points
body: <p>I want to measure the distance between two points using <strong>scikit-image</strong>. Here is the image:
  <a href="https://i.stack.imgur.com/vbOmy.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vbOmy.jpg" alt="enter image description here"></a></p>
  
  <p>In the above photo I want to measure the distance between the <strong>red point</strong> and <strong>black point</strong>. The unit of measurement does not matter to me as I want to normalize the distance by the end of the day. Any idea how I can do it? 
  Thanks</p>