The present invention relates to an
autofocus camera
system and a control method thereof, and relates to a CCTV camera
system which comprises a main processor installed in a CCTV, a memory unit connected with the main processor, an input unit, a
CCD camera, a
video processing unit, a focus lens, and a
zoom lens, wherein: the
system is designed to input and output control instructions through RS-485 communication; the system is controlled by a focus motor driver and a
zoom motor driver which are connected to the main processor in which a focus motor and a
zoom motor are comprised of stepping motors; and the focus motor driver performs auto-focusing using a luminance and a
contrast ratio displayed in an image of a corresponding point after performing a step movement to a focus point divided into sections of multiple steps according to the size of a lens, thereby implementing an
autofocus through a 1 / 3" CCD at the CCTV camera, and controlling the drive of the zoom and
autofocus through each of the stepping motors to enable high-speed driving, increase the driving efficiency and control efficiency, and enable self-
verification and correction for an error in the autofocus.