Patent ID: 6700628
Filing Date: 2004-03-02
Classification: G06T,H04N

Abstract:
A device for controlling a brightness of an image comprising:a control point detecting unit which receives an image and obtains a cumulative density function (CDF) of a frame of the image, divides an abscissa of the CDF into a required number of portions, and detects control points resulting from the division; and an image signal brightness controlling unit which calculates a change in a brightness of a next frame of the image based upon the CDF and the control points, wherein the change in the brightness of the next frame of the image is selectively adjusted based on latch values selected between default latch values and calculated latch values, and wherein the image signal brightness controlling unit comprises: a signal selection logic unit which performs a selection logic in response to a comparison signal from a comparing unit and forwards a selection logical signal; a signal selector which selects at least one latch value signal in response to the selection logic signal; a first multiplier which multiplies a plurality of LSBs (least significant bits) of the image with a first signal from the signal selector; an operator which subtracts the plurality of LSBs of the image from a preset value; a second multiplier which multiplies a second signal from the signal selector with a signal from the operator; an adder which adds the signals from the first and second multipliers; and a shifter which shifts a signal from the adder.