JPH07240900A - Video window control method - Google Patents

Abstract

PURPOSE:To simplify window control and to build up the video display system utilizing an inexpensive video equipment. CONSTITUTION:A synchronizing signal status register 18 detects and latches a synchronizing signal included in an input signal from video equipments 13 to 15. A synchronization control section 23 reads the register and informs it to a window sample-and-hold circuit 20. The video window management section 20 informs a control instruction to an A/D converter and a window display memory to a frame memory to a video input processing section 24 and a display processing section 25 respectively by referencing the information and information such as a window identifier for each video equipment, state information of window and a display coordinate stored in a video window management table 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a window processing method used in a system for displaying a moving image reproduced by a video device on a display, and more particularly, to a window processing method for synchronizing a video signal and a video display window. The present invention relates to a video window control method for performing control such as iconizing and redisplaying of a window for displaying video by using a vertical synchronizing signal included in a transmitted video signal.

[0002]

2. Description of the Related Art A window is for enabling display of different contents on a display, and a system for controlling each window is called a window system. In the window system, when displaying an image recorded on a medium such as a video tape on the window, the video image is played to generate and display the video window, or the video image is stopped and the video image is displayed until then. In the process of converting the windows into icons, the following operations were required.

First, a computer and a video device are connected by a video cable for transmitting a video signal. next,
Connect the control cable to control the video equipment from the computer. When displaying a video image on the display, it creates a window for displaying the video. Then, the control command is sent to the video device, the video image is reproduced, and the control command is sent to the video board so as to be displayed on the window. This causes the video image to be displayed on the generated window on the display. When the display of the video image is stopped, the video device is controlled by the computer to stop the video image. If a blank window gets in the way on your display,
The process of converting the window into an icon or disappearing is performed together with control of the video device. When video images are input from a plurality of video devices and are to be displayed on the display, it is necessary to perform the above operation on the plurality of devices.

A method for solving the above problems is, for example,
There is a method disclosed in JP-A-5-260478.
This method places a video signal and a control signal on a single transmission cable at the same time by providing a superimposing circuit and a separating circuit for the video signal and the control signal in the video device and the device that receives the signal from the video device. This is a method that enables control of a plurality of video devices. According to this method, the video signal and the control signal can be transmitted by one cable, and the cable cost can be reduced.

[0005]

In the above-mentioned prior art, the video signal and the control command can be transferred by superimposing and transmitting the video signal and the control signal. However, there is a problem that a new circuit must be provided in the video device and the device for receiving the video signal.

Further, since the image data recording portion on the video tape is finished, the video device cannot detect the state in which the image data is not substantially transferred even in the reproducing state. That is, the window cannot be controlled depending on the presence or absence of image data.

An object of the present invention is to provide a video capable of controlling the generation and disappearance of windows by synchronizing the video device and the computer, even if an inexpensive video device that cannot receive a control signal from the computer is used. To provide a display system.

[0008]

In order to achieve the above object, the present invention reads a register for holding a state by detecting a sync signal included in a video signal transmitted from a video reproducing device at arbitrary intervals. Detects the state of the video image and uses that information to determine whether to play or stop the movie or end the recorded part of the movie, and automatically perform processing such as creating a window that displays the video image or iconizing it. To do.

[0009]

According to the video window control method of the present invention, a video window can be generated and disappeared by receiving a signal from the video reproducing device, and the window can be controlled simultaneously by controlling the video reproducing device. it can. This is also possible using a video playback device that does not have a mechanism for receiving control signals from a computer.

[0010]

1 is a block diagram of hardware for constructing a video display system according to an embodiment of the present invention.

In FIG. 1, reference numeral 10 is a processor for controlling each device, which is operated by a program and a video window management table stored in the program memory 11. Reference numeral 12 is an A / D converter for converting a video image from analog to digital. One of the analog images input from the video devices 13, 14 and 15 is selected by the selector 16 and digitized to be stored in the frame memory 17. Store. The A / D converter turns on the sync signal status register 18 when the vertical sync signal of the video image is obtained from the video device selected by the selector. When the vertical sync signal from the video cannot be obtained, the sync signal status register 18 is turned off. An image from the video device stored in the frame memory 17 is displayed on the display 19. The video window generated for displaying the image input from the video device 13, 14 or 15 is displayed by the input device 110.
Also, an input from the pointing device 111 specifies a change in display position. The processor 10 receiving the command generates a display position control instruction and controls the window on the frame memory. Also, A / D
The video signal input command is set again in the converter 12.

FIG. 2 is a block diagram showing an outline of a video display system implemented by the hardware shown in FIG. Here, a video window management table 21 used for associating the windows displayed on the display 19 with the video input devices 13, 14, 15 and a command input processing unit 22 for receiving inputs from the input device 110 and the pointing device 111. , A sync control unit 23 for detecting a sync signal from the video device, a video display processing unit 24 for controlling an input from the video device, and a frame memory 1.
7 shows the relationship between the display processing unit 25 that controls the window to be written in 7, and the video window management table and the video window management unit 20 that controls each processing unit.

The video window management table 21 is a table for storing window display parameters such as a window identifier, a window state, and display coordinates for each video device.

The synchronization control unit 23 includes a video device 13, 1
A video image from one of the devices 4 and 15 is selected by the selector, the sync signal status register is read, and the data is notified to the video window management unit 20. The video window management unit 20 searches the video window management table 21 and selects the data of the corresponding device number. Then, based on the selected data, a control command is sent to the video input processing unit 22 and the display processing unit 25.

Upon receiving the data and the command from the management unit, the video input processing unit commands the selection of the video device and the restart / stop of the video input based on the data. The display processing unit creates or disappears the window displayed on the display. By this processing, when the video image is input to the A / D converter by the video device, it is possible to open the window on the display and display the video image. Further, when the video image is no longer input for some reason, it is possible to detect it and change the video window to an icon.

From the input device or the pointing device,
When a command is input, the command input processing unit 22 displays the coordinates and commands in the video display window management unit 20.
Pass to. The management unit 20 receiving the data searches the management table 21 and selects the corresponding data. Based on the selected data, a control command is sent to the management unit 20, the video input processing unit 24, and the display processing unit 25. Upon receiving the data and the command from the management unit, the video input processing unit selects the video device and restarts the video input based on the data.
Command stop. The display processing unit creates or disappears the window displayed on the display based on the data. By this processing, when a command is issued to the video window from the input device, the window and the video input can be controlled according to the command.

FIG. 3 is a flow chart showing an outline of the processing procedure in the embodiment of the present invention. When the A / D converter 12 receives the input signal from the video device and the signal includes the vertical synchronizing signal, the synchronizing signal status register 18 is turned on. In step 31, this register is read and it is checked whether an input signal from the video device is present.

If the sync signal is received, it is determined in step 32 whether a window for displaying on the display is generated or not.
Check using. If no video window has been created, a new display window is created in step 34, and the window identifier, window display position, and window size are stored in the video window management table 21. Then, a control command is sent to the A / D converter so that the video image is displayed in the window, and the image is transferred to the frame memory. In step 35, if the window has been created but has become an icon,
The window is redisplayed (step 36) and the video display command is sent again to the A / D converter to display the image on the window.

In step 31, if the vertical synchronizing signal has not come to the status register, it is checked whether the video window corresponding to the video device is open. If the window is open, send an instruction to stop the video signal input to the A / D converter in steps 38 and 39,
Iconize the window.

The video window generated by this processing is input to the input device 1 in steps 310, 311 and 312.
10 or an input from the pointing device 111 moves or disappears the window.

Next, the video display system shown in FIGS. 1, 2 and 3 will be described in detail with reference to FIGS.

The process of shifting from the initial screen 51 to the screen 52 in which the input signal from the video device 13 is displayed in the window 55 will be described. In step 41 of FIG. 4, the selector 16 switches to the video device 13. Next, the synchronization flag set in the memory 11 is turned on and the off counter is set to 0 (step 42).
The off counter specifies the number of times the status register is read. This can be changed at any time. Then, in step 43, the synchronization signal status register is read.

When an image signal is output from the video device 13, the vertical signal status register in the A / D converter 12 is on. The device number currently selected by the selector and the state in which the synchronization flag is on are passed to the video window management unit. In the management department that received it,
By referring to the window management table 581 showing the state of the screen 51, it is confirmed that the window is not generated in the video device 13, the window is generated, and the A / D converter 12 is instructed to display the video on the window. To send.

By this processing, the screen 52 is displayed and the window management table stores data such as 59. The field 512 of the management table stores the identifier of the window in which the input image from each device is displayed. In the state of the screen 52, since the window for the video device 13 is generated and displayed, the field 512 stores the video display window identifier for the video device 13. Similarly, the status, coordinates, and size of the currently displayed video window are set in fields 513, 514, 51.
Stored in 5.

Next, the processing for shifting from the screen 52 to the screen 53 will be described. The process returns to step 41 to monitor the sync signal from the video device 13. When the sync signal does not come from the video device 13, the sync flag is turned off and the off counter is incremented in step 45. Here, the sync signal may not be received temporarily due to deterioration of the video tape, so the status register is referred to a plurality of times. In the present embodiment, a value of 5 is given. When the off counter exceeds this value, it is considered that the video signal has stopped, and the video window management unit is notified of the device number and the sync flag being off. Upon receipt of this state, the window management unit refers to the video window management table 59 to convert the window of the video device 13 into an icon,
Send a control command to the A / D converter to stop the input from the video device.

By the above processing, the screen 53 and the management table 510 are set.

From this state, the process returns to step 41 again and the video image is switched by the selector. The above process is repeated in the selected video device 14. Video device 14
When the synchronization signal from is obtained, the state of the screen 54 and the table 511 is obtained by performing the same processing as in the case of shifting from the screen 51 to the screen 52.

In this process, the video device for inputting the video image is switched, the sync signal status register for holding the state of the video signal from the video device is read, and when a signal is received, a new window is opened and the video device 1
It is also possible to iconify the window displaying the image from 3.

[0029]

According to the present invention, it is possible to easily perform a process of generating a window for displaying a video or converting it into an icon by monitoring a sync signal status register which holds a state of a video signal. Become. This allows window management without controlling both the video device and the window. Further, even if a video device that does not have a function of receiving a control signal from a computer is used, it is possible to generate a window or make an icon by linking with reproduction and stop of a video image.

[Brief description of drawings]

FIG. 1 is a block diagram of hardware according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a processing outline of an embodiment.

FIG. 3 is a flowchart showing an operation outline of the embodiment.

FIG. 4 is a flowchart showing in detail step 31 shown in FIG.

FIG. 5 is an explanatory diagram of a control screen and a data structure of the video display system according to the embodiment.

[Explanation of symbols]

10 ... Processor, 11 ... Memory, 12 ... A / D converter, 13-15 ... Video device, 16 ... Selector, 17
... Frame memory, 18 ... Sync signal status register, 19 ... Display, 110 ... Input device, 111 ...
Pointing device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yumiko Sugita 1099, Ozenji, Aso-ku, Kawasaki-shi, Kanagawa Inside the Hitachi, Ltd. System Development Laboratory (72) Inventor, Reiki Yamamoto 1099, Ozen-ji, Aso-ku, Kawasaki, Kanagawa Hitachi, Ltd. System Development Laboratory (72) Inventor Toshiyuki Kuwana 5-2-1 Omika-cho, Hitachi City, Ibaraki Prefecture Hitachi Ltd. Omika Plant (72) Inventor Masato Manta 5030 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Bachi Co., Ltd. Hitachi, Ltd. Software Development Division

Claims (5)

[Claims] 1. A vertical synchronizing signal existing in a video signal sent from a video reproducing apparatus is detected in a converter for converting an analog image into a digital image and stored in a register, and the video information is stored in the register. A video window control method comprising controlling a window for displaying a video image input from a playback device. 2. The video reproducing apparatus according to claim 1, wherein the register for storing the state of the vertical synchronizing signal existing in the video signal sent from the video reproducing apparatus is read a plurality of times at arbitrary intervals. A video window control method for detecting the state of an input video image. 3. The video reproduction apparatus according to claim 1, wherein a video reproduction apparatus to which a synchronization signal is sent from a plurality of video reproduction apparatuses is determined by detecting a state of a video image input from the video reproduction apparatus. Video window control method to select input signal. 4. The window system according to claim 1, which controls between a video window for displaying a video image input from the video reproduction device and a window for displaying other information. 5. A window is controlled by sending a control signal such as image playback to the video playback apparatus to control the window, and at the same time controlling the window for displaying the video image by detecting the state of the video image from the video signal from the video playback apparatus. A method for controlling a video window, which comprises: