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. Author manuscript; available in PMC: 2015 Sep 1.
Published in final edited form as: J Mech Behav Biomed Mater. 2014 Jun 5;37:209–218. doi: 10.1016/j.jmbbm.2014.05.027

Fig. 1.

Fig. 1

Highlighted steps in the CPD algorithm. (A) An approximate contact point is found by finding the point above the threshold level (dashed blue line); (B) The slope of the line fitted through the data from the approximate contact point is determined and heuristics are used to determine a fit region; (C) A non-linear regression is performed on the fit region where the contact point is a fit parameter; (D) The Hertz model is fitted to the data for the elastic modulus.