A Graph Matching Approach to Symmetry Detection and Analysis - Computational Intelligence Paradigms in Advanced Pattern Classification - page 139

Fig. 19 Detection of multiple rotational symmetries

(a) Eigenvalues (b) Reflection | T | = (c) Rotation | T | = 1

− 1

(d) Rotation | T | = 1 (e) Reflection | T | = (f) Reflection | T | =

− 1 − 1

(g) Rotation | T | = 1

Fig. 20 Three dimensional symmetry analysis. We are able to detect all symmetry axes, but
the one corresponding to the counterpart of (f).