Fine line print enhancement

Details Fine line print enhancement Fine line print enhancement

1984-05-17

1985-10-01

Prescott, A. C.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3R, 358287, 358300, G03G 1500

Patent

active

045442649

ABSTRACT:
This discloses an electrophotographic printing machine with circuits to enhance the printing of fine lines, such as lines of a single picture element (pel) in width. Provision is made for broadening such lines in one dimension by adding small "black" areas to each edge of the fine line in order to broaden it. In a second dimension, perpendicular to the first dimension, lines are broadened by placing gray pels next to black pels. The disclosure also discusses specific cases in which it may be considered desirable to inhibit the enhancement signals.

REFERENCES:
patent: 3564131 (1971-02-01), Herold et al.
patent: 3574458 (1971-04-01), French
patent: 3649261 (1972-03-01), Dahlquist et al.
patent: 3881927 (1975-05-01), Fantuzzo
patent: 3905822 (1975-09-01), Marks
patent: 3912510 (1975-10-01), Marks
patent: 4336993 (1982-06-01), Banton
patent: 4344713 (1982-08-01), Cullen
patent: 4365275 (1982-12-01), Berman et al.
patent: 4408868 (1983-10-01), Thomas et al.
patent: 4417805 (1983-11-01), Kishi
patent: 4447126 (1984-05-01), Heidrich et al.
IBM Technical Disclosure Bulletin, "Improving Resolution of a Laser Beam Printer", R. J. Froess & F. L. Wade, vol. 26, No. 3B, Aug. 1983, pp. 1572-1573.

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