63fb46d6_bster_US___Patent_applications__Description
[Patent application number] 20080247661 [Published] 10-09-2008 [Description] 
Automatic dynamic range adjustment in digital imaging - A method of performing non-linear transformation of a digital image for contrast modification. The original video input is compared to a linear transformation with gain and offset; and, the differential Δ multiplied by a factor m obtained from a look-up table and the product mΔ added to the original input to obtain the output video.
Xing Li, Webster US - Patent applications