title: regarding the ways of removing surrounding background areas during processing the image
body: <p>The attached image, showed as follows </p>
  
  <p><a href="https://i.stack.imgur.com/fVlDQ.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fVlDQ.jpg" alt="enter image description here"></a></p>
  
  <p>It includes some surrounding areas that represents the noise or background introduce while getting the image. </p>
  
  <p><a href="https://i.stack.imgur.com/cIQki.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cIQki.jpg" alt="enter image description here"></a></p>
  
  <p>How to remove this part while processing the image. For instance, when I try to segment the original image, I got the following result, where the background areas are also included.</p>
  
  <p><a href="https://i.stack.imgur.com/nezt2.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nezt2.jpg" alt="enter image description here"></a></p>