Inventors:
Rosario A. Bracco - Webster NY
George L. Harer - Walworth NY
Sue K. Lam - Rochester NY
Louis D. Mailloux - Webster NY
Hoan N. Nguyen - Fountain Valley CA
Cheryl A. Pence - Buena Park CA
Hung M. Pham - San Gabriel CA
Cathleen J. Raker - Rochester NY
Farhad D. Rostamian - Los Angeles CA
Robert R. Thompson - Harbor City CA
Daniel D. Truong - Hawthorne CA
Assignee:
Xerox Corporation - Stamford CT
International Classification:
G06K 944, G03G 1500, G03G 2100, H04N 1387
Abstract:
A lead edge lightening circuit which will lighten a scan line based on a seven by seven pixel area surrounding the current pixel. The area is divided into four sub-areas, each of four by four pixels, and each having the current pixel at one corner. Each sub-area is summed and compared to a threshold number. If the threshold number is equalled or exceeded by at least one of the four sums, an overlay bit, which can be white or black, is output. The current pixel is replaced by a white pixel if a white pixel has been output, otherwise the current pixel remains unchanged.