Color television camera with luminance non-uniformity compensation
AssigneeSony Corporation
InventorSatoshi Shimada
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Abstract
A color television camera is provided with a single image pickup tube for producing a luminance signal and a chrominance signal, a demodulator for producing three primary color signals from the chrominance signal, an adder for adding the primary color signals to produce a relatively narrower band luminance signal and a subtraction circuit for subtracting the narrower band luminance signal from the luminance signal to produce a luminance signal compensated for non-uniformity, which is used for an aperture correction.
Claims5
A color television camera for producing a composite video signal including chrominance and luminance signals, the latter having non-uniform characteristics, comprising an image pickup means, a color filter interposed optically between an object to be televised and said image pickup means for separating an image of said object into respective color components which are projected onto said image pickup means, means for deriving the luminance signal and the chrominance signal from said image pickup means, and means for substantially eliminating said non-uniform characteristics from the luminance signal, the last-mentioned means comprising means for detecting said chrominance signal to produce a luminance signal component in response thereto, means for adjusting the level of said produced luminance signal component, and means for subtracting the level adjusted luminance signal component from said luminance signal to thereby compensate said non-uniform characteristics.
Color television camera apparatus comprising an image pickup means, a color filter interposed optically between an object to be televised and said image pickup means for separating an image of said object into respective color components which are projected onto said image pickup means, means for scanning said projected image in successive horizontal scanning intervals for deriving a composite signal comprised of a luminance signal and a chrominance signal for each horizontal scanning interval, means for receiving said composite signal and for separating same into a luminance signal and a chrominance signal for each horizontal scanning interval, delay means coupled to said separating means for producing the chrominance signal derived during the immediately preceding horizontal scanning interval and the chrominance signal derived during the second immediately preceding horizontal scanning interval, means coupled to said separating means for producing the luminance signal derived during said immediately preceding horizontal scanning interval, demodulator means coupled to said separating means and said delay means to receive the chrominance signal derived during the present horizontal scanning interval, the chrominance signal derived during the immediately preceding horizontal scanning interval and the chrominance signal derived during the second preceeding horizontal scanning interval for producing three primary color signals from said received chrominance signals, detecting means coupled to said delay means for detecting the chrominance signal derived during said immediately preceding horizontal scanning interval to produce a luminance signal component in response thereto, subtracting means for receiving the luminance signal derived during said immediately preceding horizontal scanning interval and to subtract therefrom said produced luminance signal component, and combining means coupled to said subtracting means and said demodulator means for producing a color video signal.
Dependencies are inferred from the claim text.