Graphic data processing apparatus for producing a tone for an ed

Details Graphic data processing apparatus for producing a tone for an ed Graphic data processing apparatus for producing a tone for an ed

1993-11-09

1995-01-31

Powell, Mark R.

Computer graphics processing and selective visual display system

Display driving control circuitry

Controlling the condition of display elements

395131, 395132, 345136, 345138, 345147, 345152, 382 54, 358455, G06F 1520

Patent

active

053865090

ABSTRACT:
A tone determining apparatus for determining tones of edge pixels of vector data, is especially suitable for use within an image forming apparatus of the type writing an image on a photoconductive drum by controlling a scanning beam by pulse width modulation (PWM). The tone determining apparatus involves dividing the edge pixels of the vector data, and then transforming the area of a trailing portion into a tone using a greater contribution ratio than a contribution ratio used when transforming the area of a leading portion, whenever the edge pixel is divided in a main scanning direction. The tone determining apparatus thus eliminates fine dots otherwise appearing at the leading portion, thus providing smoother edges.

REFERENCES:
patent: 4847641 (1989-07-01), Tung
patent: 4908780 (1990-03-01), Priem et al.
patent: 5126726 (1992-06-01), Howard et al.
Hearn et al., Computer Graphics, Prentice-Hall, 1986, pp. 91-92.

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