Patent ID: 8452094

Claim:
An apparatus comprising: a first block extracting only a luminance component of a saturation, hue, and value domain except saturation and hue components from red, green and blue values of an image; a second block including a log look up table having multiple stepped samples of a natural log with respect to the luminance component of the image and outputting a log summation value and pixel count value with respect to the luminance component of the image by searching and predicting a period having the image using the log look up table; and a third block calculating a luminance average value of the image by using the natural log summation value and the pixel count value outputted in the second block, the third block generating a tone mapping look up table including a tone mapping operator (L d ) for each luminance range to obtain a final output image using the calculated luminance average value one time in a single image frame, wherein the third block outputs a tone mapped red, green and blue value by multiplying a corresponding tone mapping operator (L d ) of the tone mapping look up table by a red, green and blue value of the input image, wherein the tone mapping look up table includes L avg that is a luminance average value calculated using Formula 1 L avg = exp ⁡ ( sum ⁢ ⁢ of ⁢ ⁢ log ⁢ ⁢ luminance pixel ⁢ ⁢ count ) , and wherein the tone mapping look up table includes L s induced by using Formula 2 L s = α * V cur L avg of the calculated luminance average value (L avg ), a linear scaling parameter (α) and a luminance component of a current image (V cur ).