JPH0614265A - Method and device for displaying image - Google Patents

Abstract

PURPOSE: To display two video signals or over without screen division and reduction by conducting switching control so that an input video signal is switched alternately at its division position for a full scanning period of an image and the resulting image is displayed on the setting screen. CONSTITUTION: A synchronization separator 50 is connected to a recording/ reproducing device 40, the separator 50 receives an input signal to a 1st switch 30 or a reproduction video signal to detect horizontal synchronizing and vertical synchronizing signals of the signals and gives them to a microcomputer 20 and a synchronizing signal generator 60. The microcomputer 20 controls 1st and 2nd switches 30, 80 based on the horizontal synchronizing signal and the vertical synchronizing signal received from the separator 50. Then the generator 60 receives the synchronizing signals from the separator 50 to generate synchronizing signals of a camera video signal and provides it to a camera video signal generator 70. Thus, a plurality of video signals received by the switch 30 are synchronously with each other and the microcomputer 20 controls accurately the switches 30, 80 based on each synchronizing signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display method and an apparatus therefor, and more particularly to an image display method and a method for simultaneously displaying a plurality of video input signals of a camcorder, a VTR or the like on one screen by dividing the screen. It relates to the device.

[0002]

2. Description of the Related Art Conventionally, in order to simultaneously display two types of video input signals on one screen, a PIP (Picture In P
icture) method has been commonly used. In this method, one of the two input signals is displayed as the main signal on the entire display screen (this is called the main screen),
An image generated from another input signal is displayed as a sub-screen having an area relatively smaller than that of the main screen and displayed in a corner area such as a lower end or an upper end of the display screen.

However, when two screens are simultaneously displayed according to such a PIP system, the image displayed on the sub-screen is subjected to pixel sampling according to the pixel extraction system, and the screen size is reduced and displayed. Although the entire screen is displayed, the display quality of the image deteriorates. On the other hand, in the main screen, the part corresponding to the display of the sub screen is not displayed.

In order to solve this problem, Korean Patent Publication No. 91-2377 discloses at least one bank among a number of banks whose positions are fixed on a monitor in which a horizontal window signal and a vertical window signal are combined. A method for selecting and implementing a PIP screen at a desired position is disclosed. Further, according to this method, a PIP screen which is vertically and / or horizontally enlarged by a factor of 2 is selectively obtained.

[0005]

However, in the above-mentioned conventional example, the PIP screen can still be displayed only in a reduced state, and it cannot be said that the problem which has been conventionally existed is solved. In addition, since the bank position is fixed, PIP can only be performed in a limited area.
There is a problem in that the screen cannot be obtained, and even if the screen is enlarged, it cannot be displayed beyond the limited area.

The present invention has been made in view of the above-mentioned conventional example, and does not reduce a plurality of video input signals by pixel extraction or the like, and divides the display screen vertically or horizontally to obtain a plurality of video images on one display screen. An object of the present invention is to provide an image display method capable of displaying signals simultaneously and an apparatus thereof.

[0007]

In order to achieve the above object, the image display device of the present invention has the following constitution. That is, an image display device for displaying at least two or more video signals on one screen, and an input means for inputting instruction information such as screen division, and one of the at least two or more video signals. Based on the first switching means for selectively outputting and the instruction information input by the input means, at least two divisional settings are made based on one horizontal synchronization cycle or one vertical synchronization cycle forming one field of one screen.
An image display device, comprising: a control unit that controls the first switching unit so as to output a video signal in each of two cycle sections.

According to another aspect of the invention, there is provided an image display method for displaying at least two or more video signals on one screen, the video signal input step of inputting the at least two or more video signals, and Forming one field on the screen 1
A horizontal sync cycle or one vertical sync cycle is divided into at least two cycle intervals, and a determining step of determining a video signal to be displayed in each of the cycle intervals, and the video signal corresponding to each of the cycle intervals are switched and output. An image display method having an output step is provided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of an image display apparatus capable of simultaneously displaying two video signals, which is a typical embodiment of the present invention. The apparatus shown in FIG. 1 has an input signal selection key capable of selecting an external signal (ES) such as a camera signal from a camera video signal generator 70 displayed on a screen or a broadcast signal, and a screen division. A keyboard 10 having edit keys for selecting and adjusting, and a microcomputer 20 for storing control signal data generated by key operation of the keyboard 10 and controlling each functional unit based on the data are provided. The microcomputer 20 has first and second control terminals CT1 and CT2, and controls the first and second switches 30 and 80 through these terminals.

An external signal (ES) such as a broadcast signal and a camera signal from a camera are input to the first switch 30, and the external signal (ES) or the external signal (ES) is input to the first switch 30 according to the control of the microcomputer 20. Selectively outputs the camera signal. The video signal selectively output from the first switch 30 is input to the second switch 80 and the recording / reproducing device 40, respectively. The recorder / reproducer 40 records the video signal input through the first switch 30 or reproduces the already recorded signal, and provides the output to the second switch 80 when reproducing the video signal.

Similarly to the first switch, the second switch 80 receives one of the outputs of the recording / reproducing device 40 and the first switch 30 and selectively outputs it according to the control of the microcomputer 20. The final output signal (VS) output from the second switch 80 is supplied to a monitor (not shown),
It is displayed on the monitor screen.

The recording / reproducing device 40 has a sync separator 5
0 is connected, and the sync separator 50 is the recording / reproducing device 4
Synchronous signal generation for the microcomputer 20 and the camera video signal generator 70 by receiving the input signal of the first switch 30 or the input of the reproduced video signal from 0 to detect the horizontal synchronizing signal and the vertical synchronizing signal of those signals. Supply to the container 60. Microcomputer 2
0 indicates the first and second switches 30, based on the horizontal and vertical sync signals of the input signal supplied from the sync separator 50.
Control 80. Then, the sync signal generator 60 receives the sync signal of the sync separator 50, generates a sync signal of the camera video signal, and outputs it to the camera video signal generator 70. As a result, the plurality of signals input to the first switch 30 are completely synchronized with each other, so that the microcomputer 20 can detect the first and second switches 30, 80 based on the respective synchronization signals.
Can be controlled accurately, and the synchronization is perfect when the recording / reproducing device 40 records the output signal from the first switch 30.

FIG. 2 is a flowchart showing a display control process for simultaneously displaying two or more video signals on one screen.

The display control process according to this embodiment will be described below with reference to the flow chart shown in FIG. Here, the screen display is based on the NTSC system (525 scanning lines per frame, 1 horizontal scanning time 63.5 μse).
c) shall be complied with.

First, in step S101, for example, when an external signal (ES) is being input and displayed on the screen monitor, the user tries to display a plurality of screens at the same time by pressing the edit start key for screen division through the keyboard 10. When input, an initial value for vertical or horizontal screen division is first set in step S102. That is, the initial value of the screen division is set to "0" for the horizontal scanning time (H) and the vertical scanning time (V), and the horizontal and vertical division positions are set at the center of the screen. Therefore, when the horizontal division section (m) is converted into the scanning time and viewed in one field (one frame is two fields), m = 13.
1 × 63.5 μsec, and vertical division section (n) is n =
(1/2) × 63.5 μsec.

When the initial value of the screen division is set, the user selects either horizontal division or vertical division. If the horizontal division method is selected in step S103, the process proceeds to step S104. If the division state of the screen division size is adjusted, the process proceeds to step S105 in which the keyboard 1 is selected.
The adjustment key of 0, for example, the +/- key is operated to move the screen division position (m) up and down. At this time, the unit section of horizontal division corresponds to 1H, that is, 63.5 μsec. When the desired screen division state is obtained, the horizontal division section (m) is determined in step S106. After that, if it is determined in step S107 that the horizontal scanning period (H) has reached the horizontal division section (m), the process proceeds to step S113 for recording / recording.
It is checked whether the reproducing device 40 is in the recording mode or the reproducing mode.

Here, when the recording / reproducing device 40 is in the recording mode, the process proceeds to step S114 and the output signal thereof is not input to the second switch 80, so that the first switch 30 is not switched. , The display signal is switched from the external signal (ES) to the camera signal. Therefore, when looking at only one field of the screen, the external signal (ES) appears on the upper screen.
The camera signal is displayed on the lower screen. On the contrary,
When the recording / reproducing device 40 is in the reproducing mode, the process proceeds to step S115, and the output signal is the second switch 8
Since it is input to 0, the second switch 80 is switched to output the signal from the recording / reproducing device 40 as a video signal.
Therefore, when one field of the screen is viewed, the external signal (ES) is displayed on the upper screen and the camera signal is displayed on the lower screen.

When the input of a new vertical synchronizing signal is detected in step S116 in the state where the two signals are displayed on the screen as described above, the field of the screen is changed and the horizontal synchronizing signal is newly counted. Therefore, the process returns to step S103 and the above process is repeated. As a result, when the screen is divided into upper and lower parts,
Input video signals of various types are continuously output to each of the horizontally divided partial screens.

When the vertical division is selected in step S103, the process proceeds to step S109. First, the size of the screen division is adjusted in steps S109 to S110, and then the vertical division section (N) is set in step S111. Then, after confirming that the horizontal scanning time (H) coincides with the vertical division section (N) during the first horizontal scanning in step S112, the process checks the mode state of the recording / reproducing device 40 in step S113. . Then, in steps S114 to S115, the first or second switch 30 or 80 is switched to perform the same processing as in the case of the horizontal division described above. Next, in step S116, it is confirmed whether or not a new vertical synchronizing signal is input. If the input is present, the process returns to step S103, and if not, the process proceeds to step S117. In step S117, it is further checked whether or not a cancel signal for the screen split edit key has been input. Here, if the cancellation signal is not input, the process proceeds to step S118.
And waits for the input of a new horizontal sync signal. Here, if a new horizontal sync signal is input, the process proceeds to step S1.
In step 19, the scanning time (H) is reset to "0" upon the input of the signal, and the processing is performed in step S112.
Then, the above display process is repeated. As a result, the video signals corresponding to the vertically divided screens are continuously displayed.

On the other hand, if the cancel signal of the screen division edit key is input in step S117, the process proceeds to step S120, the first and second switches are returned to the initial mode, and the process ends.

Therefore, according to this embodiment, two or three input video signals from one external signal, a camera signal and a reproduced signal are vertically and / or horizontally divided and displayed on one screen. You can Of course, it is also possible to divide the screen into a large number of areas and simultaneously display two or more input signals on one screen by appropriately preparing the arrangement and number of switch devices and the number of their input terminals. Needless to say.

In the above description, only preferred embodiments of the invention have been shown. Various aspects will be apparent to those skilled in the art without departing from the scope of the invention, which is limited only by the claims set forth herein. Therefore, the invention is not limited to only the embodiments shown and described herein.

[0024]

As described above, according to the present invention, it is possible to divide a display screen vertically or horizontally into an arbitrary size to display a plurality of images at the same time. The size of the screen can be easily changed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an image display device capable of simultaneously displaying two video signals, which is a typical embodiment of the present invention.

FIG. 2 is a flowchart showing a simultaneous display process of two video signals.

[Explanation of symbols]

 10 keyboard 20 microcomputer 30 first switch 40 recording / reproducing device 50 sync separator 60 sync signal generator 70 camera video signal generator 80 second switch

Claims (4)

[Claims] 1. An image display device for displaying at least two or more video signals on one screen, wherein input means for inputting instruction information such as screen division, and at least two or more video signals, A first switching means for selectively outputting one, and based on the instruction information input by the input means,
1 horizontal sync cycle or 1 forming 1 field of 1 screen
An image display device, comprising: a control unit that controls the first switching unit to output a video signal in each of at least two period sections divided and set based on a vertical synchronization period. 2. The first signal of the output signal of the first switching means and the at least two or more video signals.
The image display device according to claim 1, further comprising a second switching unit that selectively outputs one of the signals not selected by the switching unit. 3. The image according to claim 2, further comprising matching means for matching the vertical synchronizing signals of the video signals input to each of the first switching means and the second switching means with each other. Display device. 4. An image display method for displaying at least two or more video signals on one screen, comprising a video signal input step of inputting the at least two or more video signals, and forming one field of one screen. 1 horizontal sync cycle or 1
A vertical sync cycle is divided into at least two cycle intervals, and a determining step of determining a video signal to be displayed in each of the cycle intervals; and an output step of switching and outputting the video signals corresponding to each of the cycle intervals are provided. Characteristic image display method.