Method: Estimation of dynamic threshold for eyelid closure: (a) if the $\Vert {\overrightarrow{MV}}_{down\left(i\right)}\Vert$ > 0; Add the $\Vert {\overrightarrow{MV}}_{down\left(i\right)}\Vert$ the current frame to the set $X$; (b) if the value of $\Vert {\overrightarrow{MV}}_{down\left(i\right)}\Vert$ <= 0, this indicates the end of the closing phase and the start of the pause phase; ○ $Y=$ maximum value in the set “$X$”; ○ Add $Y$ to the thresholds set $“T”;$ ○ New threshold value = finding the median value of the $“T”$ set; Else, repeat the first step (a).