Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-04-06
1986-03-11
Corbin, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
350403, 358 55, G02B 530, H04N 9097
Patent
active
045751935
ABSTRACT:
An optical spatial frequency filter of the type having a pair of birefringent elements with means for changing the polarization state of light between them is given a substantially color dependent spatial frequency response. The filter comprises a wavelength dependent means for changing the polarization state of light between the birefringent elements such that the polarization state of light of a first color is changed by a first amount and the polarization state of light of a second color is changed by a second amount sufficiently different from the first amount such that the spatial frequency response of the spatial frequency filter is substantially color dependent. The filter is particularly useful with a color image sensor of the type having a first sampling frequency in a first color and a second sampling frequency different from the first in a second color. The filter is made to have a frequency response in the first and second colors in relation to the respective first and second sampling frequencies of the sensor. The filter has the advantage that, when used with the color image sensor, aliasing is selectively reduced in each color without reducing resolution in the other colors.
REFERENCES:
patent: 3438692 (1969-04-01), Tabor
patent: 3531180 (1970-09-01), Fleisher et al.
patent: 3588224 (1971-06-01), Pritchard
patent: 4227208 (1980-10-01), Takanashi et al.
Close Thomas H.
Corbin John K.
Eastman Kodak Company
Shapiro Bruce S.
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