Automatic dynamic range adjustment in digital imaging

摘要

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 of the change in gain or slope and the input image &Dgr; is multiplied by a factor m obtained from a look-up table and the product of m and &Dgr; added to the original input to obtain the output video.