DYNAMIC WHITE AND BLACK LEVEL CONTROL FOR DOCUMENT IMAGING
Original Publication Date: 1996-Nov-01
Included in the Prior Art Database: 2002-May-03
In document copying applications, it is very important that the subject is evenly illuminated. If the illumination of the subject is not even, or if the lens design is such that more light is attenuated at the fringes of the field than at the center, the resulting copy quality will be very poor. This is especially true if the image is 1 bit thresholded to black or white.