Gain control circuit for use in shading compensation circuit

Details Gain control circuit for use in shading compensation circuit Gain control circuit for use in shading compensation circuit

1990-03-02

1992-05-19

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358446, 358464, H04N 140

Patent

active

051153270

ABSTRACT:
A gain control circuit used in a shading compensation circuit includes a signal processing circuit for an image signal successively output from each of cells of a line image sensor and a gain control signal corresponding to shading data output from an external signal system and converting the image signal into a signal with level corresponding to the gain control signal and for outputting a compensation image signal, and signal feedback circuit for inverting a reference compensation image signal and holding an inverted version of the reference compensation image signal and for feeding the inverted version of the reference compensation image signal back to a terminal of the signal processing circuit and which the image signal is input.

REFERENCES:
patent: 4723174 (1988-02-01), Nishikawa et al.
"Liner Data Manual", Signetics, vol. 2, pp. 5-111, 112, 121, and 122, Nov. 14, 1986.

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