How to connect the following points ??

Hi,

I want to connect the key_points from a binary image, taken by some criteria, as shown in the figure below:-

[Walter Roberson]

boundary() to determine the order of the points to use.

.. but it would have been easier to preserve the edges and use mask2poly()

[Mohammad Bhat]

sir, code snippet to begin with please

[Walter Roberson]

https://www.mathworks.com/matlabcentral/fileexchange/45980-mask2poly-mask