Copier with single pass auto exposure

Details Copier with single pass auto exposure Copier with single pass auto exposure

1989-11-30

1992-09-22

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358465, 358464, 358444, 358461, H04N 140

Patent

active

051502232

ABSTRACT:
An electronic copier includes a marking engine for forming a copy based on a supplied series of electrical signals, and a data monitor for selecting a threshold reflectance from the background reflectance of the original document. The image is processed according to the threshold reflectance selected by the data monitor, and the processed signal is applied to the marking engine. A scanner generates, during a single scan of a document, a series of electrical signals representative of the image content of the documents and applies the scanned signals to the data monitor and a full page image storage buffer.

REFERENCES:
patent: 4524388 (1985-06-01), Abe et al.
patent: 4672186 (1987-06-01), Van Tyne
patent: 4672461 (1987-06-01), Yoshida
patent: 4779106 (1988-10-01), Mills
patent: 4922350 (1990-05-01), Rombola et al.
patent: 4926252 (1990-05-01), Nagano

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