Author:
Volker Bäcker
Example

Remark that the area in the example is 488 square-pixel.
Description
Measure the length of a skeleton using the algorithm from "Robust
Quantification of In Vitro Angiogenesis Through Image Analysis",
published in IEEE Transactions on Medical Imaging Vol24, No.4,
April 2005, as described in the ImageJ mailing list by Michael
Miller. The aspect ratio of a pixel is considered to be one.
Lengths are calculated from the middle of one pixel to the middle
of another pixel. Diagonal steps are by a factor of sqrt(2) longer than
horizontal or vertical steps.