1. A digital image enhancement method comprising: adjusting the brightness of an input image to obtain a brightness adjusted image, extracting background information (I B ) from the brightness adjusted image with an edge-preserve filter, extracting contrast information from the brightness adjusted image, adjusting the contrast information, which further comprises multiplying the contrast information by a contrast adjustment factor, the contrast adjustment factor using the equation: 
 Lev=(Lev max −Lev min )× I B +Lev min where Lev is the contrast adjustment factor, and Lev max and Lev mm are maximum and minimum limits of the contrast adjustment factor respectively, and combining the background information and adjusted contrast information to obtain an output image.