White balance control system专利检索-白平衡图形技术专利检索查询-专利查询网

White balance control system

阅读：954发布：2023-07-29

专利汇可以提供White balance control system专利检索，专利查询，专利分析的服务。并且A white balance control system comprised of a circuit for selectively controlling the phase of a signal having the same frequency as a color subcarrier signal of a chrominance signal, a modulator for amplitude modulating the phase controlled color signal with a luminance signal, and an adder for combining the amplitude modulated signal with the chrominance signal to control the white balance in response to the selected phase of the color signal.，下面是White balance control system专利的具体信息内容。

权利要求

1. A white balance control system for use with a color television camera of the type producing a composite signal of a luminance signal and a chrominance signal comprising means responsive to the composite signal for separating out the chrominance and luminance signals, means for providing a first signal having the same frequency and phase as those of a subcarrier signal of the chrominance signal, means for selectively controlling the phase of the first signal, means for amplitude modulating the phase controlled first signal in response to the luminance signal, and means for combining the amplitude modulated, phase controlled first signal with the chrominance signal to obtain a white balanced chrominance signal.

2. A white balance control system as recited in claim 1, further comprising meaNs for attenuating the luminance signal supplied to the modulating means.

3. A white balance control system as recited in claim 1, wherein the composite signal is representative of an object observed by the camera under an illumination of a particular color temperature, and wherein the means for controlling the phase of the first signal includes means for selectively shifting its phase by a preselected amount to compensate for the observed color temperature of the illumination of the object under observation.

4. An improved white balance control system for use with a color television camera of the type producing a composite signal of a luminance signal and a chrominance signal representative of an illuminated object and including means responsive to the composite signal for separating out the chrominance and luminance signals, means for supplying a subcarrier signal for the chrominance signal, and means for supplying a color burst signal which is combined with the chrominance signal, wherein the improvement comprises means for providing a first signal having a phase which is substantially coincident with the phase of the burst signal and a frequency which is substantially the same as the subcarrier signal of the chrominance signal, means responsive to the first signal for shifting its phase by preselected amounts to compensate for the particular color temperature of the illumination of the object under observation, means for attenuating the luminance signal, means for amplitude modulating the phase shifted first signal in response to the attenuated luminance signal, and means for combining the amplitude modulated, phase controlled first signal with the chrominance signal to correct the white balance thereof.

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