Circularity calculations are built into ImageJ 1.29 and later. Check “Circularity” in Analyze/Set Measurements and the Measure and Analyze Particles commands
will calculate and display the circularity.
This plugin is an extended version of ImageJ’s Measure command that calculates
object circularity using the formula
circularity = 4pi(area/perimeter^2)
A circularity value of 1.0 indicates a perfect circle. As the value approaches 0.0, it indicates an increasingly elongated polygon.
Note: this plugin does not work with the Analyze Particles command.
Author: Wayne Rasband (firstname.lastname@example.org) History: 2000/11/28: First version 2003/01/28: Uses the image or selection min and max; works correctly with signed images Source: SixteenBit_Histogram.java Installation:
Authors: Jeffrey Kuhn (email@example.com) The University of Texas at Austin Anthony Padua (firstname.lastname@example.org) Duke University Medical Center, Department of Radiology History: 2000/08/22: First version 2002/10/31:
Author: A. Karperien, Charles Sturt University, Australia History: 2002/08/26: First version Requires: Java 2 Source: enclose_.java Installation: Download enclose_.class to the plugins folder and restart