Print Contrast Control for Iterative Scan and Print
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-10
In a succession of scan and print operations where the scan data is electronic rather than optical, the printed image gradually degrades. This is due to the fact that the scanner in every instance assumes increasing contrast for successive scanned copies. As shown above, a better technique is to scan the original document for contrast information as well as video data.