ENVIRONMENT BRIGHTNESS DECISION METHOD FOR CONTROLLING BRIGHTNESS OF DISPLAY IN MOBILE COMMUNICATION TERMINAL WITH CAMERA HAVING AUTOMATIC GAIN CONTROL FUNCTION AND METHOD FOR CONTROLLING BRIGHTNESS OF DISPLAY UTILIZING THE ENVIRONMENT BRIGHTNESS DECISION

摘要

PURPOSE: A method for judging surrounding brightness for controlling display brightness and a method for controlling the display brightness using the judging method in a mobile communication terminal including a camera having automatic gain control function are provided to appropriately control the display brightness according to a variation in surrounding brightness. CONSTITUTION: A luminance average value of a central region corresponding to a basis region of a photographed image and a luminance average value of a surrounding area other than the central region are obtained from a video signal captured by a camera as respective brightness values of the central region and surrounding area. The brightness value of the surrounding area is compared with a predetermined dark environmental threshold(418) and, according to the compared result, the brightness value of the central region is compared with the brightness value of the surrounding area to judge the surrounding brightness to be one of dark and bright states(420).