Table 2. Accuracy measurements of face detection.

Brightness of illumination	Face direction	Total frames	Eye detection frames	Detection rate
Bright	Front	2089	1804	86.4%
	Side	2088	1887	90.4%
Dark	Front	2098	1864	88.8%
	Side	1971	1834	93.0%
Total		8246	7389	89.6%