JPS60264190A - Video image special effect device - Google Patents

Abstract

PURPOSE:To obtain a natural scene transfer effect in which a color picture pattern is transited into a natural chromakey synthesized pattern on the basis of a colorless video signal by keeping a color video pattern even with chromakey-on from the state of chromakey-off, e.g., mix-on so as to increase the fadar level. CONSTITUTION:A control signal generating circuit 33 receives a charomakey on/ off signal from a terminal 28 and a fadar limit signal from terminal 32 and changes over an output of a video switching circuit 24 into a colorless video signal being an output of a chromakey generating circuit 23 only with the chromakey-on and also full fadar. As a result, when a chromakey on/off control signal from the terminal 28 is in off-state, e.g., at mix-on, the output of a video signal switch circuit 24 is a color video signal from a distribution circuit 22, and the output of a key signal switching circuit 26 is a color video signal from a distribution circuit 22, and the output of a key gain control circuit 30 mixes the output of the distribution circuit 22, that is, the color video signal being the output of a color image pickup device 21 and the video signal from a terminal 29 in response to the fadar level.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Use" The present invention relates to a video special effects device for television broadcasting. Movie g using soft chroma key on e! ! % related to special effect equipment.

``Prior Art'' Conventionally, in order to obtain a wide variety of screen effects, images from color imaging devices such as color cameras have been used.

A key signal for extracting a certain hue part is synthesized with the B signal. A video special effect device called chromakey synthesis has been used in which a color video signal output from a color image pickup device is punched out using this key signal, and another video signal is inserted into the punched out specific hue portion. In order to improve this chroma key synthesis and obtain a natural composite screen, the edges of the extracted key signal (called a chroma key signal) are made to have a slope similar to that of the color image pickup device output.
A video special effects device called Tochromakey compositing has been used. In this case, when the edge part of the chromakey signal has a slope and the chroma key is combined, the color that should be extracted at the edge part of the key signal will remain and give naturalness to the cine. This key signal is used in advance as a pace signal for chromakey synthesis.The power of the color imaging device's output power 2 - Decolorize the part that should be extracted from the video signal.A video special effects device has been devised and used to obtain a natural chromakey composite screen. It has been.

Figure 2 is a diagram showing an example of a video special effects device that obtains a conventional soft chroma key composite screen), 1 is a color imaging device such as a color camera, 2 is a distribution unit that distributes color video signals output from the color imaging device. If the circuit has two or more color video signal outputs from the color imaging device 1, it is omitted. 3 is a color imaging device.

The R, G, and B signals from the circuit 1 and the color video signal from the distribution circuit 2 are used to generate a chromakey signal (KEY) and an achromatic video signal (CANCEL) in which a part of the extracted color is achromatized.
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4 is a video signal switching circuit that switches in response to the color video signal from the distribution circuit 2, the achromatic video signal from the chroma key generation circuit 3, and the chroma key on/off control signal from all terminals 8; when the Buta ROMA key is on, the achromatic video signal is switched. output,
When the chromakey is off, the color video signal from the distributor 2 is output. 05 is a mixing circuit that mixes the chromakey signal from the chromakey generating circuit 3 and the 7-der control signal from the terminal 7. For example, it outputs both signals. The level of the chroma key signal is controlled by a shift kneader control signal such as a non-addition mixing circuit (NAMli circuit) that outputs the higher potential of either of the two. Reference numeral 6 indicates a key signal switching circuit that switches between the key signal output from the mixing circuit 5 and the 7-factor control signal from the terminal 7 in response to the chroma key on/off control signal from the terminal 8. When the chroma key is on, the mixing circuit 5 Outputs the output key signal and outputs the fader control signal from the light terminal 7 when chroma key off 1, for example mix on, etc. □1
0 is a gain control circuit that controls the gain of the video signal output from the video signal switching circuit 4 and the video signal from the terminal 9 in response to the key signal output from the key signal switching circuit 6; When the chroma key is on, the achromatic video signal output from the video signal switching circuit 4 is gain controlled by the chroma key signal output from the key signal switching circuit 6, and the achromatic portion 9 is extracted and the video signal from the terminal 9 is inserted. The chromakey composite signal is sent to the output terminal 11. When the chroma key on/off control signal of terminal 8 is chroma key off, for example, mix on, the color video signal of the output of the key signal switching circuit 6 and the color video signal of the output of the video switching circuit 4 are mixed with the video signal from the terminal 9. and sends it to the output terminal 11.

When the chroma key is on, by changing the fader control signal of the fader lever terminal 7 from off to full, it is possible to transition from a colorless video screen to a chroma key composite screen with a fade.

Such a video special effects device can produce a very natural chroma key composition, but if you want to obtain the effect of transitioning from the chromakey output screen to the fade tech chroma key composition screen by operating the fader lever, the chroma key on will produce a color transition effect. This method has the disadvantage that an unnatural screen transition effect is produced because the transition from the achromatic image screen to the chromakey composite screen is performed by raising the shift kneader lever from the image screen to the achromatic image screen. Therefore, when using it as a video special effect, you can either turn the fader lever fully and complete the chromakey composition screen, or add a circuit to bypass the mixing circuit 5 in Figure 2 to avoid chromakey on. A method has been used in which the chroma key signal output from the chroma key generation circuit 3 is directly applied to the key signal switching circuit 6 and the screen is converted into a chroma key synthesis screen by a short cut.

``Problems to be Solved by the Invention'' Therefore, the purpose light of the present invention eliminates the drawbacks of the conventional objective light and transitions from a color video screen to a natural lima key composite screen based on an achromatic video signal, resulting in a natural It is an object of the present invention to provide a video special effect device that can provide a screen switching effect.

``Means for Solving the Problems'' According to the present invention, a video special effects device is provided which is equipped with means for maintaining a color video screen depending on the state of the fader lever even in the chroma key-on state.

"Embodiment" The present invention will be described in detail below with reference to the drawings of an embodiment of the present invention. FIG. 1 is a block diagram showing an embodiment of the present invention, in which a color imaging device 21, such as a color camera. Distribution circuit 2 that distributes color video signals from color imaging device 21
2. The distribution circuit 2 output is a chroma key generation circuit 232 that generates a cycloma key signal and an achromatic video signal in which a part of the extracted shikara is achromatic based on the color video signal output from the distribution circuit 22 and the R, G, and B signals from the color imaging device 21. A video signal switching circuit 24 that switches between the color video signal of the chroma key generation circuit 23 and the achromatic video signal of the chroma key generation circuit 23 output in response to the control signal of the control signal generation circuit 33 output. and the factory control signal.

Mixing circuit 25. Mixing circuit 25 output key signal and terminal 27
A key signal switching circuit 26 that switches in response to a chroma key on/off control signal from all terminals 28. A gain control circuit 30 that controls the gain of the video signal output from the video signal switching circuit 24 and the video signal from the terminal 29 in response to the key signal output from the key signal switching circuit 26, and outputs a video effect screen to the terminal 31. The control signal generating circuit 33 generates a control signal for controlling the video signal switching circuit 24'4c based on the chroma key on/off signal from the terminal 28 and the 7-dah limit signal from the terminal 32. Here, each of the supporting elements 21 to 31 in FIG. 1 corresponds to each of the narrow elements 1 to 11 in FIG. 2, which shows a conventional example, and has the same function.

Next, we will explain the differences from the conventional example. In the present invention, the video signal switching circuit 24tX is configured to switch in response to a control signal from the control signal generation circuit 33. The control signal generation circuit 33 receives the chroma key on/off signal from the terminal 28 and the 7-dah limit signal from the terminal 32,
When the chroma key is on and the fader is full, the output of the video switching circuit 24 is sent to the chroma key generation circuit 2.
This is to switch to a three-output achromatic video signal. Therefore, under other conditions, the video switching circuit 24 selects the color video signal output from the distribution circuit 22. As a result, terminal 28
When the chromakey on/off control signal from the chroma key on/off control signal is off, for example, when mix is on, the output of the video signal switching circuit 24 is a nine-color video signal from the distribution circuit 22.The output of the nine-way key signal switching circuit 26 is fader control from the terminal 27. In addition to the signal, the gain control circuit 30 mixes the color video signal output from the distribution circuit 22, that is, the color video signal output from the image pickup device 21, and the video signal from the terminal 29 in correspondence to the seven Ader levers.

When the fader lever is in a position to fully output the color video signal output from the color imaging device 21 and the chroma key on/off control signal from the terminal 28 is turned on, the output from the key signal switching circuit 26 is transferred to the mixing circuit 25. Although it becomes an output chroma key signal, the video signal switching circuit 24 still outputs the color video signal output from the distribution circuit 22 and sends it to the output terminal 31 via the gain control circuit 30. From this state, when the 7eder lever is gradually controlled to the full side, the output of the gain control circuit 30 gradually fades, and the output of the divider circuit 2
A portion of the color video signal from the two outputs is extracted and the video signal from the terminal 29 is inserted. When the fader lever is completely moved to the full side, i.e.
When the area designated by the chromakey is inserted only by the video signal from the terminal 29, the output of the control signal generation circuit 33 becomes a control signal that changes the output of the video signal switching circuit 24 to output an achromatic video signal, and the gain control is performed. The output of the circuit 30 is based on the achromatic video signal output from the chromakey generating circuit 23, and a natural soft chromakey composite screen into which the video signal from the terminal 29 is embedded is formed. In Fig. 1, the distribution circuit 2
2 outputs a color video signal to the color imaging device 21 output.
You can omit it if you have more than one. In addition, in a normal video special effects device, a video switching device is installed on both video signal input sides of the gain control circuit 300, that is, at the entrance of the terminal 29 and between the distribution circuit 22 and the video signal switching circuit 24, for selecting a large number of inputs. inserted.

``Effects of the Invention'' As explained in detail above, according to the present invention, the color video screen is maintained even when the chroma key is turned off, for example from the mix-on state, and the color video screen is changed by raising the 7eder lever. A video special effects screen having a natural screen transition effect that transitions to a natural ROMA key composite screen based on an achromatic video signal can be obtained.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention. FIG. 2 is a configuration diagram showing a conventional video special effects device. In the figure, 1.21...color imaging device, 2°22
...Distribution circuit, 3.23...Chroma key generation circuit. 4.24... Video signal switching circuit, 5.25... Mixing circuit, 6.26... Key signal switching circuit, 7.27...
・Fader control signal input terminal, 8.28... Chromakey on/off control signal input terminal, 9.29... Video signal input terminal, 10.30... Gain control circuit, 11゜3
1... Output terminal, 32... Fader limit signal input terminal, 33... Control signal generation circuit. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] chromakey generating means for receiving a first color video signal and generating a chromakey signal and an achromatic video signal in which the color of the extracted portion designated by the chromakey signal is erased; and the first color video signal. video signal switching means for switching between the chromakey signal and the achromatic video signal; mixing means for mixing the chroma key signal and an external seven-factor control signal; and a key signal from the mixing means and the fader control signal. key signal switching means for switching in response to an external chromakey effect on/off control signal; and a second video signal complementary to the output video signal from the video signal switching means in accordance with the output from the key signal switching means. gain control means for controlling and applying gain to the image signal; and control for making the selection in the video switching means select the achromatic video signal depending on the full state of the fader control signal and the on state of the chromakey effect on/off control signal. A patent characterized in that it comprises a control signal generating means for generating a signal.