Image reading apparatus with data density and gamma correction m

Details Image reading apparatus with data density and gamma correction m Image reading apparatus with data density and gamma correction m

1997-05-29

1999-07-27

Gross, Anita Pellman

Registers

Coded record sensors

Particular sensor structure

235455, 235467, 235472, 348254, 348255, 348256, G06K 710, H04N 5202, H04N 520, H04N 564

Patent

active

059294175

ABSTRACT:
An image reading apparatus in which reference density data corresponding to a reference document having a predetermined reference density is stored in advance, while a plurality of gamma correction curves are also stored in advance. Light intensity data indicative of the intensity of light reflected from the reference document is subjected to a shading correction. One gamma correction curve is selected from the plurality of gamma correction curves in correspondence to a difference in output level between the reference density data and outputted density data obtained by converting the shading corrected light intensity data. Gradation of the outputted density data is adjusted based on the selected gamma correction curve.

REFERENCES:
patent: 4903121 (1990-02-01), Uomori
patent: 5361140 (1994-11-01), Hayenga et al.
patent: 5404165 (1995-04-01), Ohtsubo et al.
patent: 5532467 (1996-07-01), Roustaei
patent: 5717200 (1998-02-01), Hashimoto

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