JPH02198290A - Color shadow superimposed signal generator - Google Patents

Abstract

PURPOSE:To prevent the coming out of one part of a background picture by generating a key signal for a black color signal part from a superimposed video signal having the black color signal part. CONSTITUTION:The black color signal component of a superimposed video signal 102 is identified by a black color key signal generating circuit 17, and a black color key signal 105 is generated. The signal 105 and a color key signal 104 are inputted to a non-adding and mixing circuit 16 and made into an output signal 106, an output signal 107 of a delay circuit 13 and an output signal 108 of a delay circuit 14 are inputted to a non-adding and mixing circuit 15, and a key signal 109 is outputted from the circuit 15. In a synthesizing circuit 3, since a background video signal 101 is keyed by the signal 109, a superimposed signal 103 is inserted into the signal 101, and an output signal 110 is generated, for the signal 101, the part equivalent to the black color signal part of the superimposed video signal 102 is keyed, and synthesis is executed. Thus, the black color signal part of the superimposed video signal becomes a black color, and it can be prevented that one part of the background picture comes out.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a color shadow super signal generator,
This invention relates to a color shadow super signal generator that generates a signal for superimposing colored characters and the like on a background video of a special program by adding shadows.

[Conventional technology]

FIG. 3 is a block diagram showing an embodiment of a conventional color shadow super signal generator, and FIG. 4 shows signals of each block of an embodiment of the conventional color shadow super signal generator shown in FIG. FIG.

In FIG. 3, a background video signal 101 serving as a background image and a color superimposed video signal 102 (hereinafter referred to as super video signal) including a colored superimposed image are sent to the first input terminal 1 and the second input terminal 1. The color shadow super signal generator 10 receives the super video signal 102 and processes it to generate a color superimpose signal 103 (hereinafter referred to as super signal) and a shadow super signal generator 10. A key signal 119 is generated and output to the synthesis circuit 3.

The synthesis circuit 3 receives the background video signal 1 from the first input terminal 1.
01 and the super signal 103 from the color shadow super signal generator 10. Each of the key signals 119 is received, the background video signal 101 is keyed and punched out using the key signal 119, and the super signal 103 is inserted into the key signal 119 to be synthesized and output as an output signal 120.

Next, the color shadow super signal generator 10 will be explained. First, the color key signal generation circuit 11 receives the super video signal 102 from the second input terminal 2,
The corresponding color signal component of the super video signal 102 is identified and a super signal is generated and output to the delay circuit 12, and the color signal component of the super signal is removed to generate the color key signal 104 and the delay circuit 13 and the It is output to the addition/mixing circuit 15. Delay circuit 12 and delay circuit 13
．． 14 have the same characteristics, and provide a delay corresponding to the width of the shadow in order to shade around the superimposed characters, etc., and the non-additive mixing circuit 15 is a type of logic circuit. It is a sum circuit, and the color key signal 10
4 and the signals 117 and 118 from the delay circuits 13 and 14, a wide signal is generated and output as a key signal 119.

Each of the above-mentioned signals will be explained with reference to the signal waveform diagram of each block shown in FIG.

In the figure, a background video signal 101 is a video signal of a background image. The super video signal 102 is a video signal including a colored superimposed image and a black portion, and the signal portion of the superimposed image has a corresponding color signal component.

A super signal 103 indicates a signal that has passed through the delay circuit 12 among the output signals from the color key signal generation circuit 11, and is delayed by the amount of shading. The color key signal 104 is a signal obtained by removing the color signal component from the super signal, and is a signal input to the delay circuit 13 and the non-addition mixing circuit 15. The output signal 117 of the delay circuit 13 and the output signal 118 of the delay circuit 14 are each input to the non-addition mixing circuit 15 to generate a key signal 119.

Therefore, the background video signal 101 is keyed by the key signal 119 in the zero synthesis circuit 3, which is set to be located in the center of the key signal 119 from the non-addition mixing circuit 15. The output signal 120 of the synthesis circuit 3 is generated by incorporating the super signal 103.

[Problem to be solved by the invention]

The conventional color shadow super signal generator described above can generate a key signal by identifying the corresponding color signal component for a super video signal having a black signal portion and a super signal having a color signal component. , it is not possible to identify a black signal portion that does not have a color signal component, and a key signal for the black signal portion cannot be generated.For this reason, the conventional color shadow super signal generation shown in FIG. As shown in the signal waveform diagram of each block in one embodiment of the device, the key signal 11 and the background video signal 10
1 is keyed and combined with the super signal 103, a part X of the background video signal 101 appears in the black signal portion of the super signal 10B, which has the drawback of causing an eyesore.

SUMMARY OF THE INVENTION An object of the present invention is to provide a color shadow super signal generator which eliminates the drawbacks of the conventional method by generating a key signal for a black signal portion from a super video signal having a black signal portion.

[Means to solve the problem]

The color shadow super signal generator of the present invention generates a signal for synthesizing a color superimposed image on a background image using a shadow material. a color key signal generation circuit that receives and identifies a corresponding color signal component and generates and outputs a color superimpose signal and a color key signal; and a color key signal generation circuit that receives the color superimpose video signal and identifies a black signal component and outputs a black key signal. and a non-additive mixing circuit that receives the color key signal and the black key signal, non-additively mixes both signals, and generates and outputs a key signal.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the color shadow super signal generator of the present invention, and FIG. 2 is a block diagram of an embodiment of the color shadow super signal generator of the present invention shown in FIG. FIG.

In FIG. 1, a background video signal 101 and a super video signal 102 are shown, similar to the block diagram showing an embodiment of the conventional color shadow super signal generator shown in FIG.
are supplied to the first input terminal 1 and the second input terminal 2, respectively, and the synthesis circuit 3 also operates in the same manner as in the conventional example.

Next, the color shadow super signal generator 10 will be explained.

The blocks added compared to the conventional example are a black key signal generation circuit 17 and a non-addition mixing circuit 16. First, the super video signal 102 from the second input terminal 2 is
The signal is input to the black key signal generation circuit 17 and the color key signal generation circuit 11.

The black key signal generation circuit 17 generates the super video signal 102
A black signal component having no color signal is identified, a black key signal 105 is generated, and the black key signal 105 is output to the non-addition mixing circuit 16. The non-addition mixing circuit 16 receives this black key signal 105.
and color key signal 1 from color key signal generation circuit 11
04 and non-additively mixes both signals to generate and output signal 106. This signal 106 and delay circuit 13.14
The respective output signals 107 and 108 that have passed through are both input to the non-addition mixing circuit 15, and the widened key signal 10
9 and is output to the synthesis circuit 3.

On the other hand, the super signal output from the color key signal generation circuit 11 passes through the delay circuit 12 and undergoes a delay corresponding to the width of the shadow, becoming a super signal 103 and inputting it to the synthesis circuit 3.

The synthesis circuit 3 generates a key signal 1 for the background video signal 101.
Key in 09, insert super signal 103,
The output signal 110 of the synthesis circuit 3 is generated and output.

The state of the above-mentioned signals will be explained with reference to the signal waveform diagram of each block of an embodiment of the color shadow super signal generator of the present invention shown in FIG. 1 of FIG. In the figure, a super video signal 102 and a color key signal 10
4 is the same as shown in FIG. Black key signal 1
05 is a signal generated by identifying the black signal component of the super video signal 102 by the black key signal generation circuit 17. The black key signal 105 and the color key signal 104 are input to the non-additive mixing circuit 16 and become the output signal 106, and the output signal 107 of the delay circuit 13 and the output signal 108 of the delay circuit 14 are input to the non-additive mixing circuit 15. A key signal 109 is generated and output.

In the synthesis circuit 3, a background video signal 101 (same as in FIG. 4) is keyed by a key signal 109, and a super signal 103 (same as in FIG. 4) is inserted therein to generate an output signal 110 of the synthesis circuit 3. Therefore, the background video signal 101 is synthesized by keying a portion corresponding to the black signal portion of the super video signal 102.

〔Effect of the invention〕

As described above (2), according to the color shadow super signal generator of the present invention, a color key signal is generated by identifying a corresponding color signal component from a super video signal having a black signal portion, and a black signal component is also generated. Since the black key signal is identified and the black key signal is generated by non-additive mixing of the color key signal and the black key signal to generate the key signal, the portion of the background video signal corresponding to the black signal portion of the super video signal is keyed. Therefore, when combined, the black signal portion of the super video signal becomes black, and there is an effect that a part of the background image does not appear and become an eyesore as in the conventional case.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the color shadow super signal generator of the present invention, and FIG. 2 is a block diagram of an embodiment of the color shadow super signal generator of the present invention shown in FIG. 3 is a block diagram showing an embodiment of the conventional color shadow super signal generator, and FIG. 4 is an embodiment of the conventional color shadow super signal generator shown in FIG. 3. FIG. 3 is a signal waveform diagram of each block of FIG. 1...First input terminal, 2...Second input terminal, 3
. . . Synthesis circuit, 10 . . . Color shadow super signal generator, 11 . . . Color key signal generation circuit, 12
．． 13.14...Delay circuit, 15.16...Non-addition mixing circuit, 17...Black key signal generation circuit, 101.
...Background video signal, 102...Super video signal, 1
03...Super signal, 104...Color key signal, 105...Black key signal, 106...Output signal of non-addition mixing circuit 16, 107, 117...Delay circuit 1
3 output signal, 108.118...Output signal of delay circuit 14, 109,119...Key signal, 110.12
0: Output signal of synthesis circuit 3.

Claims (1)

[Claims] A color shadow super signal generator that generates a signal for shading and compositing a color superimposed image on a background image receives the color superimposed image signal, identifies the corresponding color signal component, and generates a color superimposed image by identifying the corresponding color signal component. a color key signal generation circuit that generates and outputs an impose signal and a color key signal; a black key signal generation circuit that receives the color superimposed video signal, identifies a black signal component, and generates and outputs a black key signal;
A color shadow super signal generator comprising: a non-additive mixing circuit that receives the color key signal and the black key signal and non-additively mixes both signals to generate and output a key signal.