Automatic exposure control apparatus

摘要

An automatic exposure control apparatus includes an image frame luminance calculation unit for calculating an average luminance of an image frame; a region luminance calculation unit for calculating average luminances of a plurality of regions, the plurality of regions constituting the image frame; a select region luminance calculation unit for arranging the average luminances obtained by the region luminance calculation unit in the luminance order, for selecting at least one of the plurality of regions according to the luminance order and for calculating an average luminance selected from at least one of the plurality of regions; a backlight degree calculation unit for calculating a value representing a backlight degree based on the average luminance obtained by the select region luminance calculation unit; a target luminance calculation unit for calculating the target average luminance based on the value; and an exposure correction unit for correcting an exposure so that the average luminance obtained by the image frame luminance calculation unit is kept substantially equal to the target average luminance.