Shading correction using FIFO memory for correction data

Details Shading correction using FIFO memory for correction data Shading correction using FIFO memory for correction data

1991-10-29

1992-07-14

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358461, H04N 146

Patent

active

051307880

ABSTRACT:
A color image read apparatus which makes efficient color balance correction and shading correction by a simple configuration in a manner that color balance correction of image signals of plural colors of a color image sensor using optoelectric transducers is made in A/D conversion on the basis of a reference voltage for each color, and shading correction thereof is made on the basis of one reference data obtained from image signals of plural colors of a reference white pattern read prior to an original.

REFERENCES:
patent: 4745466 (1988-05-01), Yoshida et al.
patent: 5001768 (1991-03-01), Mita et al.

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