JPH0292170A - Digital superimposing system - Google Patents

Abstract

PURPOSE:To variously execute image synthesizing by synthesizing analog image data and other digital image data in an arbitrary number with applying a luminance level at every dot. CONSTITUTION:An A/D converting means 22 and an image synthesizing means 14 are provided, and the analog image data and the other digital image data in the arbitrary number are synthesized by applying the luminance level every dot. That is, the A/D converting means 22 outputs the analog image data by digitizing them every dot, and the image synthesizing means 14 digitally synthesizes the output data of the A/D converting means 2 and the other digital image data in the arbitrary number every dot according to the information of priority applied to the respective data every dot. Thus, the analog image data and the other digital image data in the arbitrary number can be synthesized by applying the luminance level every dot.

Description

[Detailed Description of the Invention] [Summary] Regarding the digital superimposition method that digitally synthesizes an analog image signal and digital image data, it is possible to synthesize various images by imparting brightness levels to image data and composing them. The purpose of the present invention is to provide a VD conversion means that digitizes and outputs analog image data dot by dot, and converts the output data of the A/D conversion means and an arbitrary number of other digital image data into respective dots. and an image synthesis means that digitally synthesizes each dot according to the priority information assigned to each dot of the data, and the analog image data and any other arbitrary number of digital image data are combined for each dot according to the brightness level. It is composed by having and composing it.

[Industrial application field]

The present invention relates to an image composition method in Videotex terminals, etc., and more particularly to a digital superimpose method in which image composition is performed by digitally superimposing an analog image signal from an external source and data read from an internal memory. be.

Several years have already passed since the Videotex system appeared on the market, and the content of Videotex's information services has come to require more sophisticated image information services.

In Videotex, images are synthesized in a terminal device using a system configuration as shown in FIG. That is, a real moving image from an external moving image device 1 such as a laser disc, and characters sent from the host computer 2 via the line 3 and stored in the video memory of the Videotex control device 4.

Image information such as simple graphics is combined in the videotex control device 4, and the combined video is displayed on the monitor 5.

It is desired that such a Videotex terminal device be provided with a function for performing various image compositions for Videotex's image information service, in order to enrich the image information service.

[Conventional technology]

In the conventional superimpose method, as shown in Figure 5, image data consisting of an external analog signal is combined with an analog signal obtained by D/A converting digital image data from a video memory. .

Ie multiple video notes! J lit, l1g,...
The digital video signal from any one video memory selected from ... is outputted via the combining section 12,
The signal is converted into an analog video signal via a digital-to-analog (D/A) converter 13 and input to a superimpose control section 14 . On the other hand, an analog video signal from an external video device 1 such as a laser disc is directly input to the superimpose control section 14, and the two video signals are combined. A horizontal synchronization signal in the video signal of the external video device 1 is extracted by a horizontal synchronization extraction section 15, and a superimpose control section 14 synchronizes the screen using this horizontal synchronization signal.

Also, a switching signal is extracted by the data control unit 16 from the output of the combining unit 12, and the superimposing control unit 14 uses this switching signal to insert the image from the video memory into the image from the external video device 1 and synthesize it. Control superimposition. The image synthesized in this way is displayed on the monitor 5.

FIG. 6 shows an image data switching method in the superimpose control unit 14, in which an internally provided high-speed changeover switch 17 is operated in response to a switching signal from the data control unit 16, and an external The video signal from the video device 1 and the video signal from the video memory are switched and displayed on the monitor 5.

FIG. 7 explains the composition of images in such a conventional superimpose method, in which (a) shows an image in a video memory, (b) shows an image in an external video device,
(C) represents an image that is synthesized and displayed on a monitor.

That is, the image in the video memory and the image in the external video device are scanned synchronously by a scanning line running from the upper left to the right.
When there is no image in the video memory, the image from the external video device is displayed as is on the monitor, but when the scanning line detects an image in the video memory, as shown by ■ in FIG. 7(a), the data control unit 16 operates to switch the high-speed changeover switch 17 in the superimpose control section 14, so that the image from the video memory is output and displayed. Then, when the scanning line finishes detecting the image in the video memory as indicated by ■, the high-speed changeover switch 17 is restored and the image from the external video device is output again. By repeating these operations, the image from the external video device will be used as the background.
A screen is displayed on top of which the image from the video memory is drawn.

[Problem to be solved by the invention]

As described above, in the conventional superimpose method, the image from the video memory is always simply embedded onto the image of the external video device and output to the monitor for display. Therefore, there was a problem in that only monotonous image synthesis could be performed.

The present invention aims to solve the problems of the prior art, and is to digitally synthesize data obtained by digitizing images from an external video device such as a laser disc and digital image data from a video memory. By doing this, the image data has a brightness level, and more diverse image compositions are possible. . .

The aim is to give the content of the service more expressive power.

[Means to solve the problem]

As shown in FIG. 1, the present invention has an A/D
It is provided with a converting means 22 and an image synthesizing means 14, and synthesizes analog image data and an arbitrary number of other digital image data by giving each dot a brightness level.

The A/D conversion means 22 digitizes analog image data dot by dot and outputs it.

The image synthesizing means 14 digitally synthesizes the output data of the A/D converting means 22 and an arbitrary number of other digital image data dot by dot according to the priority information assigned to each data. It is something to do.

[For production]

Analog image data from an external video device is transferred to RlG, H
The luminance signal is separated into three components, and priority information is added to each component, and each dot is digitized and output.

Then, this digital image data and the digital image data from the video memory are digitally combined dot by dot according to priority information assigned to each dot to each data.

The R, G, B and luminance signals thus synthesized are converted into analog signals and output, and displayed on a display device.

Therefore, in the present invention, analog image data and any number of other digital image data can be combined with each dot having its own brightness level.

〔Example〕

FIG. 2 shows the configuration of an embodiment of the present invention, in which the same parts as in FIG.
The converter 23 is a clock extractor.

In FIG. 2, an analog video signal from an external video device such as a laser disc is processed in an RGB separation section 21.
It is separated into analog signals of R (red), G (green), B (blue), and luminance, and is given priority information.

The A/D converter 22 A/D converts the separated R, G, B, and luminance signals dot by dot, and superimposes the R, G, B, and luminance signals, which are digital signals, together with priority information. It is guided to the impose control section 14.

On the other hand, a plurality of video memories 111, 112 .・・・・・・
R, G, and B signals made up of digital signals output from the superimpose controller 14 are also input to the superimpose control section 14, respectively. Priority and brightness information for each dot is added to each of these digital video signals.

In the superimpose control unit 14, the clock extraction unit 23 uses the clock signal extracted from the video signal from the external video device 1 to
The B signal and the luminance signal are digitally combined dot by dot. The combined signal is applied to the D/A converter 13, where the R, G, B signals and the luminance signal are converted into analog signals dot by dot, and then led to the monitor 5 and displayed as an image. .

FIG. 3 explains the composition of image signals in the superimpose control section 14.

In FIG. 3, the digital signals to be synthesized dot by dot are the signal ■ from the external video device 1, the signal ■ from the video memory llz, and the video memory 11.
An example is shown in which the signal (2) is composed of signals (2) from (2), and each is shown expanded into a frame corresponding to the dots.

In the superimpose control unit 14, R, G.

Regarding the B signal, the signals from ■ to ■ are combined dot by dot. At this time, each image data is given priority information for each bit, so if it is 0", it is The data of one dot of the frame is passed through without being selected, and when it is 1'', that data is selected and output. The image data from the external video device selected in this way or the image data from the memory 1 are transferred to R2O,
Output for each B.

In FIG. 3, numerals 31, 32, and 33 represent the R, G, and H signals selected and outputted in this way, expanded into frames corresponding to dots. 131°13
g and 13s are D/A converters provided corresponding to R, G, and H signals, which convert image data 31, 32, and 33, respectively, into analog signals and output them to the monitor 5. .

Furthermore, the priority information from the video memory includes, in addition to the one bit indicating the selection priority described above, several bits of information indicating the brightness of the dot. This brightness information is output together with the selected image data. The superimpose control unit 14 separates this luminance signal and outputs it together with the luminance signal from the external video device 1.

In FIG. 3, the luminance signals from the external moving image device or video memory selected in this way are expanded into frames corresponding to dots. The luminance signal is converted into an analog signal by the D/A converter 134 and output to the monitor 5.

Therefore, in the screen displayed on the monitor 5, in the part where image data from the video memory is not selected, the image from the external video device is displayed as is, and in the part where the image data from the video memory is selected, that image data has priority. Displayed at the brightness specified by the ranking information.

As described above, in the digital superimposition method of the present invention, it is possible to arbitrarily select digital image data from a plurality of video memories, add a brightness level, and display it on top of an image from an external video device. Become.

〔Effect of the invention〕

As explained above, according to the present invention, data obtained by digitizing an analog image from an external video device such as a laser disc, and digital image data from a video memory are prioritized dot by dot and digitally processed. Since the image data is synthesized, it is possible to display image data from one of the plurality of video memories with the brightness level attached on top of the image from the external video device, thus performing a wide variety of image compositions. You will be able to do this. According to the present invention, it is possible to give more expressive power to the contents of Videotex's information services.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the basic configuration of the present invention, FIG. 2 is a diagram showing the configuration of an embodiment of the present invention, FIG. 3 is a diagram explaining the composition of image signals in the superimpose control section, Figure 4 is a system configuration diagram showing image composition in a Videotex terminal; Figure 5 is a diagram showing a conventional superimpose method; Figure 6 is a diagram showing a conventional image data switching method in a superimpose control section; FIG. 7 is a diagram illustrating image synthesis in the conventional superimpose method. 1: External video device 5: Monitors 11x, 11+, ...: Video memory 13: Digital to analog (D/A) converter 14 Varnish-bar impose control section 21: RGB separation section 22: Analog to digital (A/D) Converter 23: Clock extractor

Claims (1)

[Claims] An A/D conversion means (22) that digitizes and outputs analog image data dot by dot, and the A/D conversion means (
22) and an arbitrary number of other digital image data, digitally composing the output data dot by dot according to the priority information attached to each data dot. , A digital superimposition method characterized by combining analog image data and an arbitrary number of other digital image data with each dot having its own brightness level.