Real-Time Face Recognition from Surveillance Video - Intelligent Video Event Analysis and Understanding - page 174

Detected ear-tips are shown in figure 15.

Fig. 15 Ear-tip detection

3.3.5 Profile Face Model

The model for the profile view is constructed using the same principles as the frontal
face. The image is searched using the O PEN CV face detector with the cascade for
detecting profile faces. When a face is detected, a nested Haar cascade is used to
detect an eye (naturally, only one eye is visible in profile view).
The baseline for profile view is again constructed using two reference points. The
first point is at the top of the nose. The second point is located by fitting a line to
the profile of the nose, and then finding a perpendicular line which is tangential to
the bottom of the nose. The point where this line meets the upper lip is the second
reference point. The baseline is constructed by joining these two points. The length
of the baseline is the reference length for the profile view. The profile baseline is
shown in figure 18.