KR950005405Y1 - Color transform circuit in a superimposing system - Google Patents

Abstract

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Description

Super-impose color conversion circuit

1 is a basic block diagram of a super impose system.

2 is a super impose color conversion circuit according to the present invention.

* Explanation of symbols for main parts of the drawings

10: matrix 20: mixer

30L: Encoder 40: Color Conversion Unit

The present invention relates to a super impose system, and more particularly to a color conversion circuit of the super impose.

In general, superimpose refers to a function in which a desired character or image is stored in advance in a memory device such as a memory, and the user superimposes the character or image on a general screen.

Camcorders and the like are emerging as video apparatuses using the superimpose function as described above.

1 is a basic block diagram of a super impose system, in which a comparator 1 outputs a signal of a superimposed portion to a super impose controller 2 by comparing an input video signal with a specific level.

At this time, if the color of the super impose is designated by the operation of an external key (not shown), a signal from the super impose controller 2 is outputted, and the encoder 3 encodes it and is imposed. Outputs a video signal.

However, the super impose system as described above has a problem in that various colors cannot be implemented because the color to impose is changed only to eight colors irrespective of the outside of the system.

Accordingly, an object of the present invention is to provide a superimposition color conversion circuit that allows a user to implement a variety of colors desired by attaching a color variable device to the outside of the super impose system.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a circuit diagram according to an embodiment of the present invention, and includes a matrix 10 configured to mix and output red, green, and blue luminance signals YRO, YGO, and YBO composed of resistors R1, R2, R3, R4, and R5. ) And the mixer 20 for mixing the red, green, and blue color signals CRO, CGO, and CBO to output the color difference signal BY, RY, and the signals of the matrix 10 and the output of the mixer 20. The encoder 30 for inputting, encoding, and outputting the signal, the switch SW1 and the variable resistor VR1 are connected between the color difference signal BY and the ground, and the switch SW2 and the variable resistor VR2 are connected to the color difference. A color conversion unit connected between the signal RY and the ground and switched by a color control signal to change the level of the color difference signal RY (BY) output from the mixer 20 to change the color of the encoder 30. It consists of 40.

If the luminance signals (YRO, YGO, YBO) and the color signals (CRO, CGO, CBO) are input to the matrix 10 and the mixer 20 now, the red, green, and blue luminance signals (YRO, YGO, YBO) are resistors. The matrix 10 is mixed with the luminance signal level Y suitable for each color and then input to the encoder 30.

The red, green, and blue color signals CRO, CGO, and CBO are input by the mixer 20 to the encoder 30 as color difference signals B-Y (R-Y).

At this time, the encoder 30 which inputs the luminance signal Y and the color difference signal B-Y (R-Y) encodes a signal suitable for each method and outputs an impose video signal EB.

When the auto / manual (A / M) signal input to the switch 40 in the above operating state is "low" (Auto), the switch (SW1) (SW2) is opened.

When the switches SW1 and SW2 are opened, only the designated colors (8 colors) generated by the super impose controller are output from the encoder 30.

If the auto / manual (A / M) control signal is in the manual position (“high”), the switch SW1 (SW2) is turned “on” so that the color difference signal BY (RY) is variable resistor VR1 and (VR2). ) Will be connected. At this time, if the variable resistors VR1 and VR2 are properly adjusted, the levels of the color difference signals B-Y (R-Y) input to the encoder 30 are changed.

When the chrominance signal level BY (RY) is changed, the video signal output from the encoder 30 is changed to output a superimposing color with a color suitable for the user's taste according to the control of the variable resistors VR1 and VR2. You can.

As described above, the present invention can freely change the imposed color by adjusting the color difference signal level of the color signal output from the super impose controller, thereby performing more various super imposing.

Claims (1)

In the super impose color variable circuit, resistors R1, R2, R3, R4, and R5 output from the super impose controller are used to convert red, green, and blue luminance signals YRO, YGO, and YBO. A mixer 20 for mixing and outputting a matrix 10 for mixing and outputting color difference signals BY and RY by mixing red, green, and blue color signals CRO, CGO, and CBO output from the superimpose controller; An encoder 30 for inputting, encoding and outputting the signal of the matrix 10 and the output of the mixer 20, and a switch SW1 and a variable resistor VR1 are connected between the color difference signal BY and ground. And a switch SW2 and a variable resistor VR2 are connected between the color difference signal RY and ground, switched by a color control signal, and output from the mixer 20 to the level of the color difference signal RY (BY). And a color converting unit (40) for changing the color of the encoder (30) by changing the.