An eye-gaze tracking method and an automatic adjusting method for object lens of CCD camera in combining the aperture regulation with zooming and focusing are proposed by analyzing the geometrical positions of two LEDs

a camera

an eye cornea and its glints. The aperture of CCD lens is controled to adapt the system to external lighting circumstances based on the average brightness values of the processed images.A SMD operator is used for focusing roughly and quickly in a large scale for obtaining the eye glints to control a pan-tilt unit for eye aiming and eye tracking

and regulating the focus of the lens to locate the eye and adapt the head movements in a head-shoulder image. The FSWM operator is applied in the determined window in the eye region to focus automatically for getting clear images. If the pupil can be extracted from the image

the average gradient of the edge points of the pupil can be used for real-time focusing. Experiments show that this system can track the eye and acquire clear eye images in real time by the adaptive regulation of the CCD camera in different external lightings and user position conditions.