Picture processing apparatus

Details Picture processing apparatus Picture processing apparatus

1994-03-25

1995-09-26

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358461, 358462, H04N 138

Patent

active

054538483

ABSTRACT:
An image processing apparatus useful in, for example, FAX machines, for processing a binary or multiple level tone data in an image including a switch for selectively outputting either a binary level or the multiple level tone pattern in accordance with a selection signal the state of which is determined by the interline reading interval times while scanning the image on an original document. The image processing apparatus includes a temporary storage register for storing a digital binary or multiple level tone pattern, and a selection switch controlled by a binary/multiple level tone selection signal for selectively coupling to the maximum voltage reference input of an analog-digital converter an output signal either from a background color compensator when the binary/multiple level tone selection signal indicates binary level tone image processing is occurring or a voltage value established by a first voltage divider whose resistor values are predetermined according to output voltage levels from the image sensor during multiple level tone image scanning. The digital-analog converter converts binary or multi-level tone pattern data output from temporary storage register into an analog signal using a minimum voltage reference established by a second voltage divider which has resistor values selected in accordance with the minimum output levels from the image sensor. The analog signal from the digital-analog converter is converted to a voltage and compared in a comparison calculator to generate digital data representing the scanned image.

REFERENCES:
patent: 5262873 (1993-11-01), Ishizuka
patent: 5321526 (1994-06-01), Takenaka

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