Re: bending and radius of curvature

Posted by vischer on Dec 21, 2010; 10:49am
URL: http://imagej.273.s1.nabble.com/Re-bending-and-radius-of-curvature-tp3686117p3686119.html

Hi Wayne and others,

For closed shapes, I rather would associate "Fit Circle" to be similar to "Fit Ellipse", i.e. same area and centroid. This is currently not the case: a longish, symmetrical particle outline could result in a very large radius (see macro below). Also if I remove the "Fit Spline" in the macro, I don't understand the meaning of the resulting circle.

What about applying the "Fit Circle" only to open shapes (MultiPoint, Segmented Line), while closed shapes just would return a circle with same area and centroid?

Norbert Vischer


newImage("A", "8-bit White", 550, 550, 1);
makeOval(80, 200, 200, 50);
setKeyDown("shift");
makeOval(90, 220, 10, 10);//so it behaves like a traced roi
run("Fit Spline");//optional
run("Invert")
wait(1000);
run("Fit Circle");