defining local maximum value and creating a mask

Hi guys,

I have a matrix with 2 maximum local, this regions aren't single points, and I want to know the position where occur these two maximum .

After that, I need to create a mask, like poly2mask function, with the shape of a circle centered in the local maximum value.

I don't know how to do this. I've been trying to better understand the poly2mask and imregionalmax function, but I'm failling everytime.. xD




Thx for the help,
Wanderson.