How to connect missing circle edges in a binary image?

How I can connect the missing edges in the circle in a binary image? I do want to thicken the edges, though, I want to connect them.

Any help in details?

well appreciated

Answer 1

[Image Analyst]

Use bwdist() to find the max value of the Euclidean Distance Transform in the middle region of your image. That max value will be the radius of the biggest circle that can fit in that region. Then use imellipse to burn a white circle into your image, like the attached demo. Think about it first, and come back with your code if you still can't figure it out.