JPH0342788Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Field of Application" This invention relates to an image composition apparatus that uses a so-called chromakey panel and synthesizes a substitute image by fitting it into the chromakey panel portion.

``Conventional Technology'' With the advancement of technology in the broadcasting industry, information charts using weather information images and computer graphics are increasingly being used in programs. For example, these images may be displayed in a large size, filling the entire screen, and the performer may be photographing the displayed image while giving instructions and explaining it.

Conventionally, the following three methods have been used to perform such imaging.

(a) Set up a large panel with an image drawn on it, and film the performer standing in front of it and pointing out the image on the panel while explaining.

(b) A reproduced image is projected onto a screen using a large projection device, and a performer stands in front of the image projected on the screen and photographs the performer while pointing out and explaining the image.

(c) Electrically synthesize using a chroma key panel (this will be discussed later).

Method (a) allows obtaining large, clear images, but it is difficult to change the images on the panel one after another. Preparing a drawing with many images and replacing it with the next one requires a lot of effort to draw and replace the images, it is impossible to change the images continuously, and it is difficult to create complex images. It is also difficult to draw. Method (b) can display a moving image, but in a brightly lit studio, if the image on the projected screen is re-photographed, the image will appear faded and a clear image cannot be obtained.

The method using chroma key back (c) is carried out as shown in FIG. At least a part of the panel 11, the oval-shaped part in the center in the figure, is a so-called chroma key back 12, which is almost a single color such as dark green. Point and explain. The camera 14 photographs this state with the camera 14.
The output video signal of is supplied to the chromakey amplifier 15, a part of which is branched and sent to the synthesis amplifier 16, and the remaining video signal is used to generate the key signal corresponding to the chromakey back 12 portion, that is, the panel 11 as shown in the image 17. Inside chromakey bag 12
A key signal of high level for some parts and low level for other parts is generated, and this key signal is supplied to the synthesis amplifier 16 as a switching control signal. Meanwhile, the other panel 18
is taken by another camera 19, and the output video signal of that camera 19 is input to the synthesis amplifier 16. The synthesis amplifier 16 outputs the video signal from the camera 14 to the output terminal 21 when the key signal is at a low level, and outputs the video signal from the camera 19 when the key signal is at a high level. Therefore, in the reproduced image of the composite video signal obtained at the output terminal 21, as shown as an image 22, the chromakey back 12 portion is composed of the image of the panel 18, and the other portions are composed of the image of the panel 11.

In this way, even moving images can be combined, and the quality of the combined image will be clear. However, there was the following drawback. That is, a part of the composite video signal at the output terminal 21 is branched and supplied to the monitor 23, where it is reproduced. Monitor 23 is performer 1
3, and performer 13 is placed near monitor 2.
3, while pointing at a screen on the chroma key back 12 that is not actually visible. As a result, the movements of the performer 13 became unnatural, and it was difficult to accurately position and point to the image on the panel 18. Furthermore, if the image on the panel 18 is changed one after another, it becomes difficult to give accurate instructions.

``Means for Solving Problems'' According to this invention, in a device that synthesizes images using the chromakey method, a translucent chromakey back is placed in a part of the camera shooting angle, and a video signal is played back to the chromakey back. A video player is provided which is displayed in an overlapping manner from the opposite side of the camera, and the video signal played back by the video player and the output of the camera taken by the camera are combined by a chromakey method. The image displayed superimposed on the chromakey bag does not affect the creation of the key signal, but is bright enough to be recognized by performers who are near the chromakey bag.

"Embodiment" FIG. 1 shows an embodiment of this invention, and parts corresponding to those in FIG. 4 are given the same reference numerals. In this example, the shooting angle of the camera 14 is filled with the panel 24,
In the case where a reproduced image is projected onto the back of the panel 24, which is at least partially a chroma key back, the panel 24 is at least partially a semitransparent chroma key back, and this semitransparent chroma key back has a chroma key hue ( For example, it is possible to use a flat object with good transmission efficiency for light (e.g., green) with LEE filter #122 pasted on a plate glass, or a transparent colored synthetic resin plate such as acrylic or a colored glass plate. I can do it. A screen 25 is provided in contact with the back surface of the panel 24. screen 2
Reference numeral 5 is a semi-transparent device that allows the image projected on the back surface (the surface opposite to the panel 24) to be seen from the front of the panel 24, and is preferably focused on the panel 24 by a Fresnel lens.

A performer 13 stands in front of such a panel 24 and photographs this panel 24 with a camera 14. On the other hand, the output video signal of the camera 19 is sent to the distribution amplifier 26.
One of them is supplied to a synthesis amplifier 16, and the other is supplied to a projector 27 as a video player. The image reproduced by the projector 27 is projected onto the screen 25. In this case, the size and position of the image on the panel 24 and the size and position of the projected image on the screen 25 are made to match. This can be easily done with camera work or digital video effects.

Performer 13 is shown on screen 2 through panel 24.
In order to be able to recognize the image projected on the camera 5 and to accurately create a key signal using the chromakey amplifier 15, in other words, the uniform single hue component of the chromakey back is extracted from the output video signal of the camera 14 as a signal above a certain level. so that it can be taken out as In order to satisfy these two irreconcilable requirements relatively easily, the following procedure can be used.

By using a color projector as the projector 27, it is possible for the performer 13 to perceive a certain degree of hue in the projected image even in a bright studio.

Furthermore, the black level of the projected image is increased and the white level is 100.
%, by setting the black level to about 30 to 50%, a single hue of chroma key can be obtained with sufficient saturation even in the black part of the projected image, and a key signal can be created without error. This increase in black level is caused by the projector 2.
This can be done by adjusting the brightness in step 7.

If the amount of light is insufficient in the corners of the screen, the screen 25 may be partially illuminated by the bias light source 28.

As shown in FIG. 2, as a video player, a flat video display 28 such as a so-called wall-mounted television player is arranged behind the panel 24, and the display surface of the flat video display 28 is placed opposite to the panel 24. You can touch it.

Note that in the example of FIG. 1, the screen 25 may be omitted and the reproduced image may be directly projected onto the panel 24. Further, as the video signal to be combined with the output video signal of the camera 14, not only the output of the camera 19 but also the output of a video reproducing device such as a video tape or a video disc may be used.

``Effects of the invention'' As mentioned above, the image compositing device of this invention allows the director to correctly specify the image position, and without any unnaturalness, and can freely synthesize large, clear videos or continuous images. be able to.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one example of an image synthesizing apparatus according to this invention, FIG. 2 is a block diagram showing another example, and FIG. 3 is a block diagram showing a conventional image synthesizing apparatus.

Claims (1)

[Scope of Claim for Utility Model Registration] A camera, a chroma key back placed at a part of the camera's shooting angle, and a chromakey amplifier that generates a key signal corresponding to the chroma key back part from the output video signal taken by the camera. and a synthesis amplifier that is controlled by the key signal and inserts another video signal into the chroma key back portion of the output video signal, wherein the chroma key back is semitransparent. . An image synthesizing device, further comprising a video player to which the other video signal is supplied and displays a reproduced image of the video signal superimposed on the chroma key back from the side opposite to the camera.