Face Detection and Modeling for Recognition - Biometrics Research ...

(a) (b) (c) (d)
Figure 5.18. Examples of misclassification: (a) input test image; (b) semantic face
graph of the image in (a); (c) face graph of the misclassified subject; (d) face graph of
the genuine subject obtained from the other images of the subject in the database (i.e.,
without the input test image in (a)). Each row shows one example of misclassification.
components include face outline, ears, and hairstyle, while internal components are
eyebrows, eyes, nose, and mouth. We can see that the external facial components
play an important role in recognition, and the Fourier descriptors provide compact
features for classification because the dimensionality of our feature space is lower (see
Table 5.2) compared to those used in eigen-subspace methods. Figure 5.18 shows the
three examples of misclassification in a leave-one-out test for the facial component
set T 1 using all the frequency components. The false matching may result from the
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