Output correction in image reproduction

Details Output correction in image reproduction Output correction in image reproduction

1985-06-19

1987-04-21

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358213, 358280, 358284, H04N 514, H04N 140

Patent

active

046600825

ABSTRACT:
Calibration and shading correction of output image data of a photosensor array are carried out simultaneously by varying the gain and offset value of a photosensor amplifier in synchronism with input scanning of an original. The variation of gain and offset is made as a function of a first density reference voltage obtained by scanning a first density reference board, a second density reference voltage obtained by scanning a second density reference board and ideal voltages corresponding to the first and the second density reference voltages.

REFERENCES:
patent: 3800079 (1974-03-01), McNeil et al.
patent: 4216503 (1980-08-01), Wiggins
patent: 4314281 (1982-02-01), Wiggens et al.
patent: 4571573 (1986-02-01), Tadauchi et al.
patent: 4589034 (1986-05-01), Yokomizo

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