I am trying to detect a smooth boundary of an image (attached) to find contact angles of each component in contact (the whole image is not attached).
Firstly, I averaged 3*3 pixels to reduce noises and then, used 'imgradient()' to detect the boundary (subplot(2,2,3)).
To get a single boundary line, I used 'edge()' and tried different methods (Solbel, Canny, etc.), but I am getting two boundaries, which I didn't intend... Is there any way that I can get only the inner line (orange arrows are indicating) in the last picture (subplot(2,2,4))?
I googled and searched but I could not find clear solutions on this so far. I really appreciate your time and comments in advance.