JPH1132326A - Video picture displaying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the increase of manufacturing costs while maintaining real time picture display by constituting a set of converting part of a selecting means and a signal converting means, and providing two sets of converting parts in parallel. SOLUTION: One set of converting part 14 is constituted of a selecting means 12 which selectively extracts one video signal 10a from plural video signals 10, and a signal converting means 13 which simultaneously digitizes the video signal 10a extracted by the selecting means 12, and two sets of converting parts 14 are provided in parallel. Then, while one video signal 10a is being digitized by one converting part 14a, synchronization with a next video signal 10b to be digitized is operated by the other converting part 14b, and after the end of the synchronization is confirmed, a processing operation for mutually switching the converting parts 14 to be used for digitizing the input signal is executed while the video signals 10 to be fetched in the converting parts 14 are successively switched.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video image display apparatus for synthesizing and displaying a plurality of video images reproduced from a plurality of video signals on one display screen, and in particular, is not synchronized with each other. The present invention relates to a method of digitizing a plurality of analog signals while synchronizing them to synthesize a screen.

[0002]

2. Description of the Related Art Heretofore, a display device of this type has been proposed in which, for example, a video decoder is provided for each of a plurality of video cameras, and the output signals are switched by a multiplexer for each frame to synthesize a screen. I have. Furthermore, a method is also conceivable in which the number of video decoders is limited to one, and a video signal output from a video camera is digitized while being selectively selected by a multiplexer.

[0003]

However, in the method in which one video decoder is provided for each video camera, since each video camera is always connected to the video decoder, once synchronization is performed, Can switch the video camera to be displayed on the screen at any time, but when the number of video cameras increases, the number of video decoders also needs to be increased accordingly, resulting in significant cost There are increasing disadvantages.

On the other hand, a method of switching one video decoder by using a multiplexer can be handled by one video decoder irrespective of the number of video cameras, so that an increase in system cost can be suppressed to a minimum. However, each time a video camera connected to a video decoder is switched, a loss time for synchronization is required. Therefore, when the number of video cameras increases, responsiveness decreases and frame drops on a display screen occur. There was a problem that the display of was difficult.

[0005] The present invention solves the above-mentioned problem at a time, and comprises two video decoders, while performing digitization processing on one side and synchronizing on the other side, thereby achieving image display. It is an object of the present invention to provide a video image display device capable of suppressing a rise in manufacturing cost as much as possible while maintaining real-time properties.

[0006]

A video image display apparatus according to the present invention has a plurality of video signals 1 not synchronized with each other as schematically shown in FIG.
0 are individually digitized in synchronization with each other, and a plurality of digitized image data
By synthesizing on one display screen, a plurality of video images can be displayed in parallel in real time.

Here, selecting means 12 for selectively extracting one video signal 10a from the plurality of video signals 10;
A signal converter 13 for synchronizing and digitizing the video signal 10a extracted from the selector 12 constitutes a set of converters 14, and the converter 1
4 are provided in parallel for two sets.

Furthermore, while one converter 14a digitizes one video signal 10a, the other converter 1
In 4b, synchronization is performed on the video signal 10b to be digitized next, and after it is confirmed that the synchronization has been completed, the processing operation of switching the conversion units 14 used for digitizing the input signal to each other is performed by a conversion operation. It is characterized in that the video signal 10 to be taken into the section 14 is executed while being sequentially switched.

The above-mentioned video signal 10 is a signal output from three or more video cameras 15 as shown in FIG. 4, and the above-mentioned converter 14 is provided with a control means 1 provided separately.
A multiplexer 17 that allows one video camera 15 to be selected by the first control signal S1 output from the control unit 6;
A video decoder 18 separates the analog video signal 10 output from the selected video camera 15 into a video signal and a horizontal / vertical signal and digitizes the video signal. The two sets of conversion units 14a and 14b are used in parallel. The output digital signal is selectively extracted through the switching means 19 by the second control signal S2 output from the control means 16 described above, and then the necessary data is stored in the storage means 20 for image display. Written and displayed on display means 21

[0010]

As described above, the present invention includes two video decoders 18 and performs synchronization while performing digitization processing on one side, thereby achieving synchronization.
It is possible to suppress an increase in manufacturing cost as much as possible while maintaining the real-time property of image display as it is.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2 and FIG. 3, a PLC 23 specially designed for sequence control of a target system 22 is connected to the present invention, and a display corresponding to data handled therein is performed. Display 24
5A, an analog video image 26 sent from the video camera 15 disposed near the target system 22 is superimposed on a digital display image 25 as shown in FIG. While processing data,
An example in which the contents of an instruction through a touch panel 27 provided on the display screen 11 are transmitted to the PLC 23 and the program is displayed on a programmable display device 28 that enables control of the target system 22 is shown, but the present invention is not limited to this. It goes without saying that the present invention can be carried out in substantially the same manner for a display device dedicated to image display or a general-purpose display device.

A program type display device 2 embodying the present invention.
8 is integrated with the PLC 23 in an operation console or the like of the target system 22 or is independently provided at an arbitrary position, and is used as creation, operation, or display panel of various data for the target system 22.

That is, as shown schematically in FIG. 2, an external configuration is selected from various display devices such as a liquid crystal display panel and a CRT so as to close a large opening provided at the front center of the main body case 29. The display 24 is provided, and its surface is covered with a transparent touch panel 27 in close contact. Further, the display control circuit 30 shown in FIG.
In the instruction operation by pressing on 7, the input position is captured and analyzed via the touch panel controller 31, and
The screen can be operated manually.

The basic configuration of the display control circuit 30 is substantially the same as that of a general personal computer, and various memories including a CPU 33, a ROM 34 and a RAM 35 via a bus line 32, or an image described later in detail. The processing unit 36 is connected. The CPU 33 performs a predetermined calculation operation according to a system program stored in the ROM 34 in advance, while calculating results appropriately stored in the RAM 35 or the target system 22 extracted from the PLC 23 through the communication controller 37 and the communication path 38.
Is processed by the image processing unit 36 using graphic data stored in the memory in advance, and then the display screen 11 of the display 24 is displayed.
Above, it is displayed in substantially the same manner as in the past.

The image processing unit 36 combines the digital image data formed as described above and the analog image data captured by using the video camera 15 with each other, and displays the image data on one display screen 11. 5A, one or more windows 39 are opened on the digital image 25 as shown in FIG.
By displaying the analog moving image 26 in the window 39, the operation state of the target system 22 being controlled by the PLC 23 is confirmed in real time by the video image 26 while confirming the control state of the PLC 23 displayed by digital values. Make it visible.

That is, a plurality of units (4 in this embodiment) arranged at appropriate places such as near the target system 22
As shown in FIG. 4, an analog video signal 10 transmitted from a video camera 15 is converted into first and second converters 14a and 14 whose operations are controlled by an image controller 40.
b and is converted into a digital signal.

Here, the first and second converters 14a and 1a
4b have the same configuration.
After selecting one of the four inputs, the selected video signal 10 is input to the video decoder 18.

The video decoder 18 is a video camera 15
An analog video signal 10, such as an NTSC signal, output from the input device is input, and a video signal or a horizontal / vertical signal included in the signal 10 is separated from each other, and digitization is substantially the same as that of the related art. (For example, product number "SAA711" manufactured by Phillip Inc.).
1 ").

As described above, the first and second conversion units 14
The digital signals extracted from the video decoder 18a and 14b are further switched by the switching unit 4 controlled by the image control unit 40.
After one of them is taken out in step 1, it is written into the first frame memory 43a. On the other hand, the second frame memory 43
b, the above-mentioned digital image data is stored as appropriate, and the image synthesizing unit 44 synthesizes the image data of the first and second frame memories 43a and 43b, thereby obtaining the data contents of the frame memory 43. Is displayed on the display 24.

When the image 26 to be displayed on the display screen 11 is 1 or 2 as shown in FIG. 5 (a), the first and second conversion units 14a and 14b control the video to be fetched. By switching the image to be displayed on the display screen 11 using the switching unit 41 while being permanently connected to the camera 15, image display is performed in substantially the same manner as in the related art.

According to the present invention, the image control unit 40 for displaying the images 26 corresponding to the video signals 10 output from the three or more video cameras 15 on one display screen 11 at the same time. Has its features in the control contents by

For example, four images A to D as shown in FIG.
Are displayed in parallel on the display screen 11,
Video signals 10 output from four video cameras 15
Is not synchronized with the programmable display device 28, and synchronization with the programmable display device 28 is required prior to digitization of the video signal 10 by the video decoder 18 and writing to the frame memory 43. .

For example, if it is assumed that one frame of digital signal output from the video camera 15a is being written to the frame memory 43a by the first converter 14a from time t1 to time t2 in FIG. Part 1
In 4b, the multiplexer 17 is switched to the video camera 15b to be processed next, and the video camera 15b
The video signal 10b output from the
And perform synchronization.

At the same time as the video signal 10a output from the video camera 15a at time t2 is written into the frame memory 43a for one frame, the signal to be output from the switching unit 41 is switched to the second conversion unit 14b. Display data extracted from the video signal 10b output from the video camera 15b is written into the frame memory 43a for one frame.

Similarly, while the video signal 10 output from one video camera 15 is written into the frame memory 43a by using one conversion unit 14a, the other conversion unit 14b uses the following processing. By taking in the video signal 10 output from the video camera 15 to be subjected to data processing and performing synchronization, writing of image data into the frame memory 43 and display on the display 24 can be performed without providing a waiting time for synchronization. Is displayed in real time.

The supply source of the video signal 10 is not limited to the video camera 15 described above, but various devices such as a video recorder can be used. It is also possible to increase the number of inputs of the video signal 10 to the conversion unit 14 to four or more. In this case, it is sufficient to use a multiplexer 17 having the same or more input terminals as the number of input signals.

Furthermore, the number and type of the video images 26 displayed on the display screen 11 can be switched by a switch configured using the touch panel 27. In this case, the number and the order of the video signals 10 to be taken into the video decoder 18 via the multiplexer 17 by the image control unit 40 are controlled in accordance with the above-described procedure.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram schematically showing a basic configuration of the present invention.

FIG. 2 is a partially broken perspective view showing an example in which the present invention is applied to a programmable display device.

FIG. 3 is a block diagram illustrating an example of an electric circuit.

FIG. 4 is a block diagram illustrating an example of an image processing unit in FIG. 3;

FIG. 5 is an explanatory diagram showing a display state of a video image on a display screen.

FIG. 6 is an explanatory diagram showing an operation procedure in the image processing unit.

[Explanation of symbols]

 Reference Signs List 10 video signal 11 display screen 12 selection means 13 image conversion means 14 conversion unit 15 video camera 16 control means 17 multiplexer 18 video decoder 19 switching means 20 storage means 21 display means 22 target system 23 PLC 24 display 25 display image 26 video image 27 Touch panel 28 Programmatic display device 30 Display control circuit 35 RAM 36 Image processing unit 37 Communication controller 38 Communication path 39 Window 40 Image control unit 41 Switching unit 43 Frame memory 44 Image synthesis unit

Claims (2)

[Claims] 1. A plurality of video signals (10) that are not synchronized with each other are individually digitized while being synchronized, and the digitized image data are combined on one display screen and parallelized. A video image display device capable of displaying a video image in which a plurality of video signals (10) are converted into one video signal (10).
a) a selection means for selectively extracting a) and a signal conversion means (13) for synchronizing and digitizing the video signal (10a) extracted from the selection means (12). Unit (14), and two sets of conversion units (14) are provided in parallel, and one video signal (10a) is provided by the first conversion unit (14a).
During the digitization process, the second converter (14b) performs synchronization with the next video signal (10b), and after confirming that the synchronization has been completed, uses the signal for digitizing the input signal. At the same time as switching the conversion section (14) from the first conversion section (14a) to the second conversion section (14b), the video signal to be taken into the first conversion section (14a) is switched to the next one to be digitized and synchronized. A video image display device. 2. The video signal (10) is a signal output from three or more video cameras (15), and the conversion section (14) is output from a control means (16) provided separately. A multiplexer (17) that allows one video camera (15) to be selected by the first control signal S1, and an analog signal (10) output from the selected video camera (15) is converted into a video signal and a horizontal / vertical signal. A digitized signal, which is composed of a video decoder (18) that separates the signals and performs a predetermined digitizing process, and that is output in parallel from the two sets of converters (14a) (14b) is described above. Control means (1
After the data is selectively taken out via the switching means (19) by the second control signal S2 output from (6), the data writing operation necessary for the image display storage means (20) is performed. Item 4. The video image display device according to Item 1.