White reference data generating unit applied to shading correcti

Details White reference data generating unit applied to shading correcti White reference data generating unit applied to shading correcti

1992-01-03

1994-05-31

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358461, 358462, H04N 104

Patent

active

053174216

ABSTRACT:
A white reference data generating unit which generates white reference data used in a shading correction process includes a line memory for storing white reference data, a determination circuit for determining whether or not the image data supplied from an image sensor is equal to or less than a predetermined threshold level, a updating circuit for updating the white reference data stored in the line memory to new white reference data calculated based on the white reference data stored in the line memory and input data while each line on a white reference plate is scanned, and a selector for supplying the image data, as the input data, to the updating circuit when the determination circuit determines that the image data is greater than the threshold level, and for supplying difference data, as the input data, to the updating circuit when the determination circuit determines that the image data is equal to or less than the threshold level, the difference data being obtained by subtracting a predetermined value from the white reference data stored in the line memory.

REFERENCES:
patent: 4783836 (1988-11-01), Takashima
patent: 5062144 (1991-10-01), Murakami
patent: 5099341 (1992-03-01), Nosaki et al.
patent: 5146351 (1992-09-01), Maehara

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