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US 5,208,661 AGranted
Color picture display device and color camera
AssigneeU.S. Philips Corporation
InventorCornelis A. M. Jaspers
Life of this patent
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Abstract
Color picture display device and/or color camera including a controllable gamma arrangement C, C' in which a controlled color correction circuit operating in synchronism with the control of the gamma arrangement is provided. This color correction circuit is preferably constituted by a controlled amplifier device A, A' for controlling the chrominance signals applied to the color picture display device or supplied by the color camera.
Claims4
A color picture display device comprising:
- means for receiving a color video signal composed of a gamma-precorrected luminance component and gamma-precorrected chrominance components;
- a matrix circuit for deriving gamma-precorrected primary color signals from the received gamma-precorrected luminance and chrominance components;
- gamma correction means coupled to the matrix circuit for modifying the gamma of the primary color signals, said gamma correction means having a control input for controlling the gamma of the primary color signals in response to a gamma control signal applied to the control input;
- means for generating said gamma control signal;
- and
- a color picture display screen coupled to the gamma correction means for displaying the color picture represented by the gamma-corrected color signals, characterized in that said picture displaying device further comprises:
- a color correction circuit for modifying, in response to the gamma control signal, the mutual ratio of the primary color signals either before or after the gamma correction means.
4 more elements
A color camera comprising:
- a sensor device for converting a color picture into a plurality of primary color signals;
- gamma correction means coupled to the sensor device for converting the primary color signals into gamma-precorrected color signals, said gamma correction means having a control input for controlling the gamma in response to a gamma control signal applied to the control input;
- means for generating said gamma control signal;
- and
- a matrix circuit for deriving a gamma-precorrected luminance component and gamma-precorrected chrominance components from the gamma-precorrected color signals, characterized in that said color camera further comprises:
- a color correction circuit for modifying, in response to the gamma control signal, the mutual ratio of the primary color signals either before or after the gamma correction means.
3 more elements
Dependencies are inferred from the claim text.