Real-Time Face Recognition from Surveillance Video - Intelligent Video Event Analysis and Understanding - page 180

Fig. 20 Face matched at multiple scales using O PEN CV Haar Cascade face detector
Fig. 21 Affect of Skin Detection on Performance: Darryl
However, a window of 30-50 pixels is still measurably faster than not using skin
detection.
Skin detection is also vulnerable to false positives and this reduces performance.
This is illustrated in figure 22, as the colour of Adrian's clothing is within the range
of detected skin tones (see figure 27; the outer bounding box indicates the detected
skin region that is passed to the Haar cascade for face detection). In this case, there
is no performance improvement by using skin region detection.