Flare compensation circuit for television
AssigneeU.S. Philips Corporation
InventorsRudolf Kemner, Bernardus G. J. Kuilman, Hilbrand J. Smit
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Abstract
A flare or scattered light compensation circuit for television, wherein a controllable signal difference amplifier is present to a first input of which a picture signal, affected by flare or scattered light, is applied, a compensation signal obtained by signal integration being applied to a second input. The gain factor of the amplifier is controlled substantially proportional to the quotient of the peak-peak value of the picture signal and of the difference value of the said peak-peak value and the value of the compensation signal.
Claims5
A flare compensation circuit for television, the circuit comprising a signal integration circuit having an input for receiving a picture signal affected by flare or scattered light and an output for supplying a compensation signal derived therefrom, also comprising a signal difference amplifier circuit having a first input for receiving the picture signal and a second input for receiving the compensation signal, characterized in that the signal difference amplifier circuit comprises a controllable amplifier a control input of which is connected to the output of a second amplifier circuit having an input for receiving the said compensation signal, the gain factor of the controllable amplifier being substantially proportional to the quotient of the peak-peak value, which has been fixed at a predetermined value, of the picture signal affected by the flare, and of the difference value of this peak-peak value and the value of the compensation signal.
Dependencies are inferred from the claim text.