Image gradation setting device for use in an image forming appar

Details Image gradation setting device for use in an image forming appar Image gradation setting device for use in an image forming appar

1995-11-30

1998-05-05

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358401, 358458, 358296, H04N 100, H04N 140

Patent

active

057488576

ABSTRACT:
An image gradation setting device includes a control density level determining portion for determining based on received image data a control density level indicative of a light amount for each of the first to n-th imaging areas of one imaging element. The control density level determining portion allots only to the first imaging area a control density level in accordance with received image data if the received image data is equal to or lower than a predetermined reference density level, and respectively allots to the first to n-th imaging areas control density levels in accordance with received image data if the received image data is larger than the predetermined reference density level, a minimum control density level of each of the second to n-th imaging areas being made to be larger than a particular control level equivalent to the particular light amount, and a maximum control density level of each of the first to (n-1)-th imaging areas being made to be the particular control level smaller than a control density level equivalent to the predetermined reference density level.

REFERENCES:
patent: 5055943 (1991-10-01), Kishida
patent: 5148287 (1992-09-01), Kemmochi et al.
patent: 5200831 (1993-04-01), Tai
patent: 5339171 (1994-08-01), Fujisawa et al.
patent: 5359431 (1994-10-01), Ng

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