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Fig. 5.5
Nod Stages: eyes above upper threshold
Fig. 5.6
Nodding detection method and its stages. (
a
) Head tilting down—eyes beneath the upper
threshold. (
b
) Head tilting down—eyes beneath the lower threshold. (
c
) Head recovering up—eyes
above lower threshold. Head recovering up—eyes above upper threshold: Nod is complete
5.2.4
Alert Stage
If the eyes are kept closed for exceedingly long periods of time and/or if the system
detects that the driver has started nodding, it is time to alert the driver that his safety
is in danger. This is accomplished in the current prototype by combining a high-
pitch audio alert with a bright, colorful, visual warning on the smartphone's screen.
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