I have an image of an arc of a circle (the interface between two fluids in a micropipette) and I am trying to find the radius of curvature (or the radius of the full circle if extrapolated from the arc). I can work this out manually but I have many images so an automated tool to find an arc and calculate the radius would be incredibly helpful.
I have images such as this one (where the pipette edges are not visible):
Through to images like this one:
I have got as far as simply thresholding and using the find edges tool to create binary images where the arc is visible as a black line but cannot get any further.
Any help would be most appreciated.