White-level correction circuit used with an analog-to-digital co

Details White-level correction circuit used with an analog-to-digital co White-level correction circuit used with an analog-to-digital co

1993-09-30

1997-12-02

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358406, 358455, H04N 140

Patent

active

056942257

ABSTRACT:
A white-level correction circuit for an analog-to-digital converter which converts an analog image signal of a pixel, which is input from an external source, to digital image data based on white-level reference voltage and black-level reference voltage inputs. The white-level correction circuit stores white-level reference data for the pixel in a memory and reads the data from the memory in synchronization with the input of the analog image signal. A digital-to-analog converter converts the read white-level reference data to an analog signal comprising the white-level reference voltage. The digital image data is decoded and white-level reference voltage correction data is generated by correcting the read white-level reference data, based on the decoded digital image data, and the white-level correction data is stored in the memory.

REFERENCES:
patent: 5111311 (1992-05-01), Yamamoto
patent: 5151796 (1992-09-01), Ito et al.
patent: 5191445 (1993-03-01), Kurokawa et al.
patent: 5214520 (1993-05-01), Miyazawa
patent: 5249068 (1993-09-01), Takase

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