Color image input apparatus

Details Color image input apparatus Color image input apparatus

1994-05-18

1996-03-19

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358501, 358504, 358514, G03F 308, H04N 146

Patent

active

055007465

ABSTRACT:
A color image input apparatus or scanner which has three color input devices which input three color images and then convert color image optical signals to analog electric signals. Three analog/digital convertors convert the analog signals to digital signals and three shading correction devices execute shading correction for the signals. Line correction devices execute line delays for the signals and then correct color difference of the three colors in the sub-scanning direction. There are three color dot or pixel correction devices which shift the position of each dot of each color within .+-.1 dot in the main scanning direction; that is each position of re-sampling or correction in the main scanning direction determines data values or correction information from correction coefficients of each position of the re-sampling. Three color output devices which output three color images. The color image apparatus can correct the color image difference in the main scanning direction.

REFERENCES:
patent: 4667227 (1987-05-01), Ikeda
patent: 5313313 (1994-05-01), Sato
patent: 5321529 (1994-06-01), Funada

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