First of all, many thanks for your great work on PIVlab.
I want to ask one question. I'm doing some processing on my PIV experiment that I have a pair of vortices. as I attached. I want to calculate the diameter of each vortex and circulation of them. previously I used distance calculator but I think it should be the more precise way. do you have any idea? Also I used your circle series method for calculation of circulation but as you can see I have some vorticity which cant include in circles.