JPH084345B2 - Video signal synthesizer - Google Patents

Description

The present invention relates to a video signal synthesizing apparatus suitable for use in a video tape editing apparatus or the like.

[Outline of Invention]

The present invention is a video signal synthesizing device suitable for use in a video tape editing device, etc., in which a color video signal is decomposed into primary color signals and stored in a memory, and a predetermined mixing ratio of primary color signals is specified by a specifying circuit From the primary color signals stored in the memory, a primary color signal with a mixing ratio similar to the one specified by the design circuit is detected, and the signal corresponding to the detected primary color signal address is removed from the color video signal. By inserting another video signal into the address from which the signal has been removed, another image can be easily combined with the portion of any color of the image.

[Conventional technology]

Conventionally, there has been a video device such as a video tape recorder capable of performing editing called electronic editing. In this electronic editing, for example, a video signal reproduced from a video tape is subjected to a predetermined editing, and the edited video signal is recorded on another video tape.
As one of the editing, for example, it is conceivable to combine the image recorded on one video tape with the image recorded on the other video tape.

[Problems to be solved by the invention]

However, there is an inconvenience that an expensive editing device having a complicated structure is required to perform such image synthesis. Therefore, a complicated editing device for synthesizing images has been used only for commercial purposes such as broadcasting stations. However, with the widespread use of video equipment in recent years, it has been required to enable such advanced editing even in general households.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a synthesizing apparatus capable of synthesizing screens with a simple configuration.

[Means for solving problems]

The video signal synthesizing apparatus of the present invention, for example, as shown in FIG. 1, decomposes a color video signal into primary color signals and stores them in a memory (4
R), (4G), (4B), a predetermined mixing ratio of the primary color signals is designated by the designation circuit (8), and the memory (4R), (4
G), (4B) detects the primary color signal of the mixing ratio approximate to the mixing ratio designated by the designating circuit (8) from the primary color signals stored,
The signal corresponding to the detected address of the primary color signal is removed from the color video signal, and another video signal is inserted at the address from which the signal of the video signal has been removed.

[Work]

The video signal synthesizing apparatus of the present invention compares the mixing ratio of the color signals of the video signals decomposed into the three primary colors with the designated mixing ratio for each address, and when the mixing ratio is approximate, another video signal is assigned to this address. By synthesizing, it is possible to replace only the color part with the specified mixture ratio in the image with another image, and easily compose another image with any color part of the image simply by specifying the color. can do.

〔Example〕

An embodiment of the video signal synthesizing apparatus of the present invention will be described below with reference to the accompanying drawings.

The video signal synthesizing device of this example is a device that replaces only a predetermined color portion of a screen composed of video signals with a screen of another video signal.

First, the configuration of the synthesizer of this example will be described with reference to FIG. That is, in FIG. 1, (1) indicates a first video signal input terminal, and an NTSC video signal such as a reproduction signal from a video tape recorder is supplied to this input terminal (1). Then, the video signal obtained at the input terminal (1) is supplied to an analog / digital converter (hereinafter referred to as A / D converter) (2), and the A / D converter (2) outputs a digital video signal. And supplies the converted digital video signal to the color signal separation circuit (3). The color signal separation circuit (3) converts the color signal of the digital video signal into a red signal R,
A circuit that separates and outputs the three primary colors of green signal G and blue signal B. Each primary color signal is red signal frame memory (4
R), green signal frame memory (4G) and blue signal frame memory (4B). The respective frame memories (4R), (4G) and (4B) can store the primary color signal of the video signal of one frame, divide one frame into a predetermined address, and each frame memory ( Four
The red, green and blue signals R, G and R are supplied from R), (4G) and (4B) to the RGB ratio detection circuit (5) together with the address signal. The RGB ratio detection circuit (5) detects the signal level ratio of the red, green and blue signals R, G and B supplied for each address, and outputs the detection signal to the comparison signal input terminal of the comparison circuit (6). Supply to. Further, by adjusting the variable resistor (7a) included in the extraction color designating circuit (7), a specific color can be designated by the extraction color designating circuit (7), and the extraction color designating circuit (7) outputs it. The color designation signal is supplied to the RGB ratio designation circuit (8). Then, the RGB ratio designating circuit (8) outputs a red color of a color corresponding to the supplied color designating signal,
A circuit for designating the signal level ratio of the green and blue signals R, G and B, and supplies the level ratio designating signal output from the RGB ratio designating circuit (8) to the reference signal input terminal of the comparing circuit (6). Then, the level ratio designation signal supplied from the RGB ratio designation circuit (8) to the comparison circuit (6) and the RGB ratio detection circuit (5)
Compared with the level ratio detection signal supplied from, when the level ratio detection signal is close to the level ratio designation signal,
The three primary color signals R, G and B detected by this level ratio detection signal
To the address storage circuit (9).
Then, the address storage circuit (9) controls switching of a switch circuit (12) described later based on the supplied address signal.

In this switching control, the video signal at the position where the address signal is obtained in the storage circuit (9) is transferred from the A / D converter (2) to the contact (12
When it is supplied to a), the movable contact (12c)
Switch to b).

Further, the digital video signal output from the A / D converter (2) is supplied to the first fixed contact (12a) of the switch circuit (12) via the buffer circuit (10). Then, the video signal obtained at the second video signal input terminal (11) is supplied to the second fixed contact (12b) of the switch circuit (12). The video signal obtained at the second video signal input terminal (11) is an NTSC video signal obtained by digitizing the video signal reproduced from a video tape recorder or the like, and is connected to the first fixed contact (12a) and the first fixed contact (12a). The video signal is supplied in synchronization with the second fixed contact (12b). And a switch circuit (12)
The switching control by the address storage circuit (9) is performed when the video signal at the position where the address signal is obtained by the address storage circuit (9) is supplied from the A / D converter (2) to the contact (12a). The contact (12c) is connected to the second fixed contact (12b), and at other times, the movable contact (12c) is connected to the first contact.
Connect to the fixed contact (12a) of. Further, when the position of the address signal obtained in the address storage circuit (9) is an isolated point on the screen, and when the address signal is supplied only by an amount corresponding to a predetermined area or less even if it is not an isolated point, The movable contact (12c) remains connected to the first fixed contact (12a). Then, the movable contact (12c) of this switch circuit (12) is connected to a digital / analog converter (hereinafter D / A).
It is connected to a converter) (13) and the digital video signal obtained at the movable contact (12c) is converted into an analog video signal by this D / A converter (13). And this D / A converter (1
The analog signal of NTSC system video signal output by 3) is supplied to the video signal output terminal (14), and this output terminal (14) is connected to a video signal recording device such as a video tape recorder or a monitor television. To do.

The video signal synthesizing device of this example is configured as described above, and by the operation as shown in the flow chart of FIG. 2, the video signal obtained at the first video signal input terminal (1) is input to the second video signal input. The video signals obtained at the terminal (11) are combined. That is, first, the extraction color designating circuit (7) designates a color to be extracted from the video signal obtained at the first video signal input terminal (1). Then, the comparison circuit (6) compares the color signal of the video signal obtained at the input terminal (1) for each address with the specified color described above. Is stored in the address storage circuit (9). Then, if the result of the comparison shows that the colors are not similar, another address is compared in sequence. After the comparison of all addresses for one frame in this way, it is judged whether the address information stored in the address storage circuit (9) is an isolated point which is not completely continuous with other addresses, When it is an isolated point, the corresponding address information is removed. Further, after this isolated point is removed for one frame, it is judged whether or not the remaining address information is in a continuous range of a predetermined area or more. When it is less than a predetermined area, the address information in the corresponding range is determined. To remove. By doing so, the address information of the specified area of the specified color or more is obtained in the address storage circuit (9). The switch circuit (12) is controlled by the address information thus obtained in the address storage circuit (9). That is, the movable contact (12c) is moved to the second fixed contact (12b) only when the video signal of the address remaining in the address storage circuit (9) is obtained at the first fixed contact (12a) of the switch circuit (12). ) Side. By doing so, only the address position of the specified color or more in the video signal of one frame is replaced with the video signal obtained at the second video signal input terminal (11), and the synthesized video signal is obtained. Is available at the output terminal (14).

An example of the combination of the images will be explained. For example, it is assumed that the image obtained at the first image signal input terminal (1) shows a person a on a monochrome background b as shown in FIG. 3A. Is white. Then, it is assumed that the image obtained at the second image signal input terminal (11) shows the mountain range c as shown in FIG. 3B. Then, for example, the background b of the person a
When it is desired to synthesize the mountain range c, the white image which is the color of the background b is instructed to be extracted from the image obtained at the first image signal input terminal (1). By doing so, FIG.
As shown in FIG. 5, the background b of the person a is replaced with the mountain range c, and a synthesized image is output from the output terminal (14). At the time of this synthesis, since the area of the extracted portion is determined by the address storage circuit (9) as described above, if the area for this extraction is set to be relatively large, the white portion such as the eyes of the person a will be in a mountain range. It does not replace c.

As described above, according to the video signal synthesizing apparatus of this example, the video signal is once converted into a digital signal, and the color of each address is compared, and when the colors match, the video signal of the corresponding address is simply switched. You can combine images with.

In the above embodiment, the color signal is separated into the three primary colors of red, green and blue to detect the mixing ratio, but it may be separated into other primary colors such as yellow, green and cyan. Further, the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

〔The invention's effect〕

According to the video signal synthesizing apparatus of the present invention, it is possible to replace only the designated color portion in the image with another image with a simple configuration, and it is possible to easily change the designated color portion to the arbitrary color portion of the image. There are benefits to being able to combine images.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a video signal synthesizing apparatus of the present invention, and FIGS. 2 and 3 are diagrams for explaining the example of FIG. (1) is the first video signal input terminal, (2) is analog
Digital converter, (3) color signal separation circuit, (4R),
(4G) and (4B) are red, green and blue signal frame memories respectively, (5) RGB ratio detection circuit, (6) comparison circuit, (7) extraction color designation circuit, (8) RGB ratio designation A circuit, (9) is an address storage circuit, (11) is a second video signal input terminal, (12) is a switch circuit, (13) is a digital-analog converter, and (14) is a video signal output terminal.

Claims (1)

[Claims] 1. A color video signal is decomposed into primary color signals and stored in a memory, a predetermined mixing ratio of the primary color signals is specified by a designating circuit, and a mixture designated by the designating circuit is specified from the primary color signals stored in the memory. A primary color signal with a mixing ratio similar to the ratio is detected, the signal corresponding to the detected primary color signal address is removed from the color video signal, and another video signal is inserted at the address from which the color video signal signal is removed. A video signal synthesizing device characterized in that.