title: How to fit curve through cloud of points? OpenCV/C++
body: <p>Simple question. How to draw curve through all these points like human would do?</p>
  
  <p>My example input image is here:</p>
  
  <p><a href="https://i.stack.imgur.com/BlSQ3.png" rel="noreferrer"><img src="https://i.stack.imgur.com/BlSQ3.png" alt="enter image description here"></a></p>