A TECHNIQUE OF NOISE STRIPPING AND CONTOUR ENHANCEMENT FOR RASTER IMAGES
Original Publication Date: 1982-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
This is a process for the elimination of background noise dots on a copy which either existed on the original or were created during the copying process. In a system where the original scan data is converted into binary form, each data bit may be tested by using the surrounding bits as inputs to a predictor, and corrected if there is a high probability that the bit is in error. Thus, in Figure 1, bits X1 through X8 would be the inputs to a predictor. If, for example, all were zeros and Y was a one, Y would probably be an error and would be corrected to a zero. The Figure 2 pattern would work almost as well while using six predictor inputs.