Multiple valve image input device

Details Multiple valve image input device Multiple valve image input device

1990-10-12

1994-01-11

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358455, 358458, H04N 140

Patent

active

052786676

ABSTRACT:
A multiple value image input device receives image data expressed in multiple chromatic gradation levels from an outside source and converts the data into digital form. The multiple value image input device corrects the image data by dividing the data into units of data, and determining the maximum and minimum gradation levels within each unit. The data within the unit is assigned new gradation levels utilizing the full range of available gradation levels. The minimum gradation level within the unit is assigned a new relatively low gradation level, and the maximum gradation level within the unit data is assigned a new relatively high gradation level. The gradations levels between the maximum and minimum values within the unit of data are assigned new interpolated gradation levels based upon the relatively low and relatively high gradation levels.

REFERENCES:
patent: 4962433 (1990-10-01), Matsushima
patent: 4999711 (1991-03-01), Paulin
patent: 5075788 (1991-12-01), Funada

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