Shading correction device

Details Shading correction device Shading correction device

1982-08-06

1985-06-18

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 534

Patent

active

045243883

ABSTRACT:
A shading correction device wherein in advance to the reading of the document image, shading correction coefficients are obtained from optic information from uniform reflecting surface and stored in a memory element such as RAM, and correcting the picture signal in accordance with the content of the memory element when the document is read.

REFERENCES:
patent: 3902011 (1975-08-01), Pieters et al.
patent: 4200934 (1980-04-01), Hofmann
patent: 4237488 (1980-12-01), Takemura
patent: 4354243 (1982-10-01), Ryan et al.
patent: 4377820 (1983-03-01), Reitmeier

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