Image reading apparatus

Details Image reading apparatus Image reading apparatus

2006-09-05

2006-09-05

Grant, II, Jerome (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S516000, C358S521000, C358S529000, C358S530000

Reexamination Certificate

active

07102787

ABSTRACT:
An image reading apparatus comprises a correction coefficient determining circuit4for determining a correction coefficient per each bit of white reference data in a main scanning direction which are read immediately before reading an original image, a correction coefficient modifying circuit5for producing a modified correction coefficient, and a correction coefficient predicting circuit6for producing a predicted correction coefficient with reference to the modified correction coefficient. If an absolute value of a difference between the correction coefficient and the predicted correction coefficient is smaller than and not smaller than a predetermined threshold value, the correction coefficient modifying circuit5produces the correction coefficient and the predicted correction coefficient as the modified correction coefficient respectively. A correction coefficient memorizing circuit7memorizes the modified correction coefficient as shading correction coefficient data. The correction coefficient predicting circuit6produces the predicted correction coefficient for a particular bit of the white reference data in the main scanning direction with reference to at least a preceding adjacent bit preceding the particular bit in the main scanning direction.

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