This is an ImageJ plug-in developed to analyze the quality of self-assembled pattern with Voronoi Diagram, like the image below.

To use this plug-in, one must have ImageJ, which is available from NIH

Then the next step is to get the plug-in by following this link and install the plug-in.

The analysis can start with an image like below

Then by activate the plug-in via the "plug in" menu of imageJ, one can see this dialog

Click "OK", the analysis will proceed, if you selected "manual intervention", a dialog may show up like below

Make sure you selected the "multi-selection" tool on ImageJ window like below

Then you can add or remove the points we are going to use as center of the Voronoi patterns, click "OK" when done. Woooosh... You have the voronoi pattern!

And the cound of patterns with different number of edges.

If you selected "calculate nearest neighbor", you also get a distribution of the center to center distance of the nearest neighbor.

Enjoy!