Image reading apparatus having color correction according to tem

Details Image reading apparatus having color correction according to tem Image reading apparatus having color correction according to tem

1993-02-18

1996-02-27

Reinhart, Mark J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358516, H04N 121

Patent

active

054953405

ABSTRACT:
A chromatic color pattern and a monochromatic color pattern are read by an image sensor. A masking coefficient in a color masking portion or a gamma conversion characteristic of a gamma correction portion are selected in accordance with the ratio V1/V0 of a read value V1 of the chromatic color pattern and a read value V0 of the monochromatic color pattern. An output of an image data is corrected by masking processing with the selected masking coefficient and the like.

REFERENCES:
patent: 4945405 (1990-07-01), Hirota
patent: 5194945 (1993-03-01), Kadowaki et al.

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