title: Is there any way to detect edge in this situation?
body: <p>I try to detect edge using python.
  There are hundreds of algorithms for edge detection, however, the image is very obscure and unclear. The most serious problem is one edge is located at the local maximum value, but the other edge is located slightly shifted from local maximum value. Through the detailed examination, I found the other edge is located at the one of the inflection points of original values. I depicted this situation as a simple situation.</p>
  <p>Is there any simple and beautiful ways for detection edges in various situations?</p>
  <p><a href="https://i.stack.imgur.com/Q8DID.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Q8DID.png" alt="enter image description here" /></a></p>