Figure 5
From: NQR sensitive embedded signatures for authenticating additively manufactured objects
(a) The original STL design of “the Statue of Liberty”. (b) The modified design used to embed an NQR-sensitive signature within the object. (c) A cross-sectional view of the modified design, showing the space to be occupied by the tags. (d) A typical signature pattern printed using two different colors (white representing tagged filament, and green representing regular filament). The signature contains 15 tags, with each tag encoding \(K=1\) amplitude bit. The modified object and signature can either be printed together, or the latter can be inserted as an add-on after printing the object. (e) The resultant 3D-printed object containing the embedded material biometrics signature [Microsoft Visio].
