To determine whether an EGG complex corresponds
to an eyeblink, features extracted from the preprocessed
EGG are checked against reference values. The results of
the evaluations of individual features are combined to
form a composite score upon which a decision is made as
to whether the EGG complex is an eyeblink or not.
Preprocessing of EOG. The most important EGG
characteristic that distinguishes an eyeblink from other
eye movements is the steep negative slope, which corresponds
to the rapid eyelid closure. In order for an eyeblink
algorithm to reliably detect such an event, a nonlinear
erosion filter is first applied to the EGG signal