Patent ID: 7388998

Claim:
An apparatus for controlling the brightness of moving image signals, which automatically adjusts brightness of output images in real time depending on brightness of input moving images and outputs the brightness-adjusted output images, comprising: cumulative difference function detection means calculating a cumulative difference function using upper n bits of each input image; image storage means storing therein the input image; brightness adjustment means adjusting brightness of the image in real time using the cumulative difference function calculated by the cumulative difference function detection means when the input image stored in the image storage means is displayed; and wherein the cumulative difference function detection means comprises: cumulative distribution function detection means obtaining a histogram of the input image and then calculating a cumulative distribution function for the input image on the basis of the histogram; and cumulative difference function calculation and storage means calculating the cumulative difference function using a difference between the cumulative distribution function and a reference function and storing the cumulative difference function.