Shading correction device

Details Shading correction device Shading correction device

1983-07-14

1986-12-30

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358213, 358284, 358166, H04N 514

Patent

active

046333142

ABSTRACT:
A shading correction device has a variable attenuator which is provided in the transmission line of the picture signal after photoelectric conversion by the original reader. For example, at the time of reading all white surface of the original at the beginning of the original scan the information level of each bit of the picture signal, i.e., the level of each picture element, is sequentially attenuated by the variable attenuator. In order to make the level of each picture element uniform, a data on how much attenuation is required, is generated for each picture element and loaded in a memory. The variable attenuator is adapted to be driven and controlled based on the data loaded in the memory at the time of reading the original in the subsequent scan.

REFERENCES:
patent: 4486781 (1984-12-01), Wilmer et al.
patent: 4523229 (1985-06-01), Kanmoto
patent: 4554583 (1985-11-01), Saitoh et al.

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