Color separating circuit for producing red and black signals

Details Color separating circuit for producing red and black signals Color separating circuit for producing red and black signals

1983-03-18

1986-03-18

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 80, 356416, 382 17, H04N 146, G03F 308, G01J 3511, G06K 946

Patent

active

045772185

ABSTRACT:
A reading device having two different reading elements for scanning the same portion of an original in different wavelength ranges. A color separating circuit comprises a signal level adjusting circuit for adjusting the levels of picture signals provided by the reading elements so that the levels are equal to each other when white picture data is read. An arithmetic unit obtains a level difference between the picture signals which have been subjected to level adjustment by the signal level adjusting circuit. A/D converters are used for digitizing an output signal of the arithmetic unit and the picture signals provided by the reading elements. A color separation logic circuit subjects three different picture signals outputted by the A/D converters to logic operation for color separation.

REFERENCES:
patent: 4479242 (1984-10-01), Kurata

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