Shading correction having a line memory read which generates an

Details Shading correction having a line memory read which generates an Shading correction having a line memory read which generates an

1992-06-26

1995-05-02

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358447, 348615, H04N 140

Patent

active

054124891

ABSTRACT:
In an image reading apparatus, the standard data for the normalization of the image read data are obtained with use of a line memory of one line from the standard data of a plurality of lines. The white level data and the black level data are used for the normalization. The weight average of the input data of the standard data received successively one line by one converges gradually. The converged average is used for the correction of read data of an image, and the effect of image noises is reduced and the image read data is normalized at a high precision. In a continuous reading, only the white level may be updated for shortening the time for reading.

REFERENCES:
patent: 4523229 (1985-06-01), Kanmoto
patent: 4554583 (1985-11-01), Saitoh et al.
patent: 4614976 (1986-09-01), Ogata
patent: 4807045 (1989-02-01), Shimano
patent: 4829379 (1989-05-01), Takaki
patent: 5051842 (1991-09-01), Shimazaki
patent: 5124810 (1992-06-01), Seto

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