Multi-tone image processing method and apparatus

Details Multi-tone image processing method and apparatus Multi-tone image processing method and apparatus

1994-10-17

1998-08-04

Wong, Peter S.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358298, 358456, 358458, 358459, H04N 1405

Patent

active

057902720

ABSTRACT:
A multi-tone image processing method and apparatus in which mutually dissimilar tone levels are realized by changing the additive condition of recording energy by means of different recording positions, even when the number of recording operations within a specific range is identical. For example, in an electrophotographic apparatus, when the number of irradiation by a light spot within a specific range remains constant as the irradiation position is changed in the specific range, there is a change in the additive condition of the optical energy within said specific range. Thus, the area rendered visible within the aforesaid specific range also changes, thereby changing the tone level.

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patent: 4967211 (1990-10-01), Colby et al.
patent: 5041920 (1991-08-01), Hayes et al.
patent: 5099259 (1992-03-01), Hirahara et al.
patent: 5258780 (1993-11-01), Ema et al.
patent: 5270827 (1993-12-01), Kobayashi et al.

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