Automatic offset and gain control in a document scanner

Details Automatic offset and gain control in a document scanner Automatic offset and gain control in a document scanner

1993-04-06

1994-07-19

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358443, 358461, H04N 140

Patent

active

053314280

ABSTRACT:
An automatic offset and gain control method for use in an electronic high quality scanning apparatus, operating on the source signal values outputted preferably in digitized form when the scanning apparatus scans a given source document and which represent on a pixel-related basis the density values of such source segment, produces corrected signal values representative of the full range of black and white or colors of the original. In the control method, first, a minimum density value relative to the source document is determined. Then, a high density value and a low density value are identified by reference to calibrated high and low density values and from these three values the control unit calculates and stores in a memory corrections for offset and gain. These corrections are applied to the source values to continuously correct the same and thus reproduce a corrected version of the source document.

REFERENCES:
patent: 4216503 (1980-08-01), Wiggins
patent: 5115327 (1992-05-01), Ishima

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