Colored image reading apparatus

Details Colored image reading apparatus Colored image reading apparatus

1982-10-07

1985-05-14

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 146

Patent

active

045175896

ABSTRACT:
A colored image reading apparatus has a light source for illuminating the surface of an original, a transmitting optical system for dividing the light beam from the surface of the original into two beams of short wavelength zone and long wavelength zone and transmitting them to a light detector, a processing circuit for effecting an operation between the signals from the light detector and obtaining a plurality of electrical signals, and a converter circuit for converting the plurality of electrical signals into signals corresponding to respective colors, and is capable of well discriminating and reading four colors, black, blue, red and white, by selecting to predetermined values the wavelength .lambda.'b of the overall spectral characteristic on the short wavelength zone side including all of the spectral characteristics of the light source, the transmitting optical system and the light detector relative to the maximum value of the transmission factor and the wavelength .lambda.'r of the overall spectral characteristic on the long wavelength zone side relative to the maximum value of the transmission factor.

REFERENCES:
patent: 4318122 (1982-03-01), White

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