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US 7,064,871 B2Granted
Image reading apparatus which controls a correction operation of an image signal of an original image read through a transparent member in accordance with individual data representing transmittancy of the transparent member
AssigneeCanon Kabushiki Kaisha
InventorsShigeo Yamagata, Kenji Hiromatsu
Life of this patent
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Abstract
An image reading apparatus includes a line CCD which reads an original image placed on a glass original table which is illuminated by a light source, and an analog signal processor circuit which adjusts the signal level of the resulting signals, and a unit which sets numeric data which depends on the transmittancy of the glass original table. The analog signal processor circuit controls the amount of adjusting the signal level based on the set numeric data.
Claims7
An image reading apparatus comprising:
- an original table which comprises a transparent member coated with a predetermined coating agent;
- a reading unit which reads an original image through said coated transparent member of said original table and outputs an image signal;
- a correction unit which corrects a signal level of the image signal in dependence on individual transmittancy of said coated transparent member;
- a setting unit which sets individual data which depends on the individual transmittancy of said coated transparent member;
- and
- a control unit which controls a correction operation of said correction unit in accordance with the individual data set by said setting unit.
3 more elements
Dependencies are inferred from the claim text.