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：373发布：2023-07-28

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 which has two amplifiers for red and blue video signals, two memory circuits for selecting the gains of the amplifiers in response to signals applied thereto, and two comparator circuits for comparing a green video signal with the red and blue video signals, respectively. The compared signals are respectively applied to the memory circuits selectively.，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 comprising a first gain control circuit, means for applying a first color video signal to the first gain control circuit, a second gain control circuit, means for applying a second color video signal to the second gain control circuit, means for applying a third color video signal, means for producing a first color difference signal between the first color video signal as received from the first gain control circuit and the third color video signal, means for producing a second color difference signal between the second color video signal as received from the second gain control circuit and the third color video signal, a first memory circuit for controlling the first gain control circuit, a second memory circuit for controlling the second gain control circuit, and means for selectively applying the first and second color difference signals to the first and second memory circuits respectively, the first and second memory circuits storing the color difference signals applied thereto for maintaining constant the gains of the first and second gain control circuits.

2. A white balance control system as claimed in claim 1 wherein the first and second memory circuits respectively comprise field effect transistors and memorize the color difference signals in capacitors connected to the gates of the transistors.

3. A white balance control system as claimed in claim 2 wherein the field effect transistors are of the source follower connection and supply their source voltages to the respective gain control circuits.

4. A white balance control system as claimed in claim 1 wherein the first, second and third color video signals are each any one of red, blue and green signals.

5. A white balance control system as claimed in claim 4 wherein the first and second color difference signal producing means are first and second subtraction circuits, respectively.

6. A white balance control system as claimed in claim 4 which is provided with a matrix circuit for producing R-Y and B-Y signals, the R-Y and B-Y signals being supplied to the first and second memory circuits.

7. A white balance control system as claimed in claim 6 wherein the first and second memory circuits are each provided with a clamp circuit and an integration circuit.

8. A white balance control system as claimed in claim 1 wherein the color difference signal applying means are actuated when the image of a white object is picked up.

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