JPS63197178A - Special effect generating device - Google Patents

Abstract

PURPOSE:To attain the same function as the provision of plural super process key signal generators, by providing plural frame memories corresponding to one super process key signal generator and a special effect picture synthesizing part respectively. CONSTITUTION:By selecting A as the base of a video, next, selecting video B as the input raw material of a key signal generator 7, then synthesizing them, the output of a picture synthesizing part 3 generates video E. The output of the key signal generator 7 at that time is stored in the frame memory 8a. Next, the input of the key signal generator 7 is switched to video C, and a key signal generated from the raw material is stored in the frame memory 8b. Furthermore, the input of the key signal generator 7 is switched to video D, and the key signal generated from the raw material is stored in the frame memory 8c. Next, by selecting the video E as the input of a picture synthesizing part 4, and synthesizing it with the key signal read out from the frame memory 8b at the picture synthesizing part 4, the synthesizing effect video F of three raw materials of the videos A-C can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television video signal synthesis device, and more particularly to a special effect generation device for superimposing characters, etc. onto a base video signal.

[Conventional technology]

Conventionally, this type of special effect generating apparatus has a configuration including three rows of special effect screen synthesis sections 3°4.5, as shown in FIG. 2, for example. The super effect will be explained below as one of the main special effects. As shown in Figure 3, super compositing involves compositing video B, which is the key material for superimposing, with video A, which is the base, and adding borders and coloring to make video B more effective. Get C.

When superimposing characters or the like on image A, which is the base, it is necessary to process image B, which is the key material, and generate key signals necessary for coloring or edging.

The key signals are generated by three key signal generators 7, respectively. This special effect generating device is capable of synthesizing three or more superimposed characters with one unit, and can further synthesize another character superimposition in the special effect screen synthesizing section 4 to the video synthesized by the special effects screen synthesizing section 3. Similarly, the third special effect screen synthesis section 5 can further synthesize another super to the video synthesized in the previous two effect columns (special effect screen synthesis sections 3 and 4). The screen synthesis/waveform shaping section 6 at the final stage of the transmission line has a waveform shaping processing function such as clipping the white level and changing the synchronization signal in addition to the function of mixing and synthesizing the two video signals. In FIG. 2, 1 is a video input terminal, 3 is an input selection matrix switch, and 9 is a video output terminal.

[Problem that the invention seeks to solve]

The conventional special effect generating apparatus described above requires key signal generators for super processes corresponding to the number of key super functions in the overall configuration. In order for the super process key signal generator to generate a key signal for the border of superimposed characters, for example, many stages of IH delay circuits are required.
This results in a complicated circuit and an increase in cost. Therefore, the entire special effect generation device combining a plurality of key signal generators becomes large-scale and expensive.

[Means for solving problems]

The special effect generating device of the present invention generates super-necessary key signals for each selectively inputted key material video signal and selectively inputs them into a plurality of frame memories.
a super process key signal generation circuit, an input base material video signal and one of the plurality of frame memories;
a first screen synthesis circuit that synthesizes a key signal from two and outputs a video signal subjected to a first superimposition; and a first screen synthesis circuit that synthesizes the video signal output from the first screen synthesis circuit and the plurality of frames. and a second screen synthesis circuit that synthesizes the key signal from the other one of the memories and outputs a second superimposed video signal.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1 showing an embodiment of the present invention, a plurality of video signals are supplied to a video input terminal 1 of this special effect generating device. The main sources of video signals include cameras, VTRs, and telecine cameras. The matrix switch 2 arbitrarily selects and switches these video signals, which are input materials, for each input column of the special effect screen synthesis sections 3, 4, and 5.

This selection switching is done manually by the operator. The special effect screen compositing units 3, 4.5 have screen compositing functions such as mix, wipe, and super. The super process key signal generator 7 generates two types of key signals, an insert key signal and a border key signal, in response to key material input. Frame memories 8a, 8b, and 8c store key signals in units of one screen (one frame) of a television video signal. The final stage screen synthesis/waveform shaping section 6 is the final stage effect array of the special effect generating device, and has a waveform shaping function in addition to mix and super functions. In addition, in the figure, 9 is a video output terminal.

Next, super compositing will be explained as an example of screen compositing. Here, the video supplied to video input terminal 1 is
Four types of images A, B, and C shown in the figure.

D, and images B, C, and D are used as key signal generation materials.

First, video A is selected as the base video, and then video B is selected as the input material of the key signal generator 7 and is synthesized. Then, the output of the screen synthesis section 3 becomes the video E. The output of the key signal generator 7 at this time is stored in the frame memory 8a. Next, the input of the key signal generator 7 is switched to video C, and the key signal generated from this material is stored in the frame memory 8b. Furthermore, the input of the key signal generator 7 is switched to video, and the key signal generated from this material is stored in the frame memory 8c. Next, the image E is selected as an input to the screen compositing section 4, and the screen composing section 4 synthesizes the image E with the key signal read from the frame memory 8b.
A composite effect image F of the three materials , B, and C is obtained. Similarly, by combining the key signal read from the frame memory 8c and the image F in the screen synthesis section 5, a composite effect image G of the images A, B, C, and D can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, a plurality of super process key signal generators and a plurality of frame memories provided corresponding to each of the special effect screen synthesis sections are used to generate a plurality of super process key signals. Functionality equivalent to having a generator can be achieved. In this case, each screen synthesis section can independently set each mode of the super effect, for example, the selection of a signal to be inserted and the selection of an input signal for a part of the border. Recently, the scale of semiconductor memories has been increasing year by year, and the structural cost has also decreased significantly, and the price of frame memories is much lower than that of super process key signal generators. As a result, it is possible to realize a special effect generating device that has a small overall configuration and high cost performance while maintaining the overall function.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing a conventional example, and FIGS. 3 and 4 are diagrams showing examples of screen effects. 1... Video input terminal, 2... Input selection matrix switch, 3, 4.5... Special effect screen composition section, 6...
- Final stage screen synthesis/waveform shaping section, 7... Super process key signal generator, 8a, 8b, 8c... Frame memory, 9... Video output terminal.

Claims (1)

[Claims] one super process key signal generation circuit that generates key signals necessary for super for each selectively inputted key material video signal and selectively inputs them to a plurality of frame memories, and the inputted base material; a first screen synthesis circuit that synthesizes a video signal and a key signal from one of the plurality of frame memories and outputs a video signal subjected to a first superimposition; and an output from the first screen synthesis circuit. and a second screen synthesis circuit that synthesizes the image signal processed by the image processing and the key signal from another one of the plurality of frame memories and outputs the image signal subjected to the second superimposition. Special effect generator.