KR100725384B1 - System keyboard with video input/output function and surveillance system for the system keyboard - Google Patents

Abstract

A system keyboard having a video input / output function and a surveillance system using the system keyboard are provided.

A system keyboard according to an embodiment of the present invention includes a video input port for receiving a video signal from a plurality of channels, a user interface for inputting a command of a user, a control signal according to a command of the user, A communication port for transmitting to one of the devices and a video signal of at least one channel from a plurality of channels of video signals inputted through the video input port in accordance with the user's command and using the video signal of the selected channel A video processor for providing a video signal to be displayed, and a display for displaying the provided video signal.

System keyboard, surveillance system, video processing

Description

TECHNICAL FIELD The present invention relates to a system keyboard having a video input / output function and a surveillance system using the system keyboard and a surveillance system using the same,

1 is a block diagram showing a configuration of a conventional surveillance system.

2 is a block diagram illustrating a configuration of a surveillance system according to an embodiment of the present invention.

3 is a block diagram illustrating a configuration of a system keyboard according to an embodiment of the present invention.

4 is a block diagram illustrating the configuration of a system keyboard according to another embodiment of the present invention.

5 is a block diagram illustrating the configuration of a system keyboard according to another embodiment of the present invention.

6 is a block diagram illustrating an operation of a system keyboard according to an embodiment of the present invention.

7 is a diagram illustrating video output according to one embodiment of the present invention.

The present invention relates to a surveillance system, and more particularly, to a system keyboard having a video input / output function and a surveillance system using the same.

The surveillance system is also called a closed circuit television (CCTV) system. In general, television broadcasting transmits image information to an unspecified number of persons through a wireless medium. However, CCTV uses a wireless medium. However, it is a concept in which image information is transmitted to a specific person through a wired medium.

The surveillance system can be used for surveillance of distant places, surveillance of places where humans are difficult or inaccessible, surveillance of invisible areas, and surveillance of multiple sites at the same time. For example, using a surveillance system, you can monitor remote parking lots in a department store or apartment, monitor the inside of a nuclear power plant, monitor an enemy in the infra-red range through night-time infrared cameras And can monitor multiple locations in the building at the same time.

To construct such a surveillance system, three components are required.

1. Camera system

The camera system includes at least one camera. In a surveillance system, each camera acquires an image in a place or area that the surveillance system wants to monitor.

2. Transmission system

The transmission system transmits the image signal obtained from the camera system to the image processing system. Video transmission method is available both wired and wireless, but wired transmission method is mainly used so far. This is because, in the case of wireless, it requires allocation of radio frequency. The wired transmission includes a base band transmission method in which a video signal is transmitted as it is, a carrier transmission method in which a video signal is modulated by transmitting it on a carrier wave and a modulated video signal is transmitted, and a pulse code modulation (PCM) And an optical communication system in which an electric video signal is modulated with an optical signal and transmitted. Each transmission method has unique characteristics, and the transmission method can be selected considering the distance to the monitoring place, the purpose of the monitoring system, and the cost. The transmission system is responsible for the transmission of control signals. As the control signal transmission method, a serial communication method or a TCP / IP communication method can be used.

3, image processing system

The image processing system receives and reproduces, stores, or edits a video signal transmitted through a transmission system. To this end, the image processing system includes at least one or more monitors, storage devices, and image control devices. A VCR is a device for storing image information obtained from a video signal to a storage device. However, in recent years, there has been used a VCR that compresses or stores an image using a digital compression method, for example, (Digital Video Recording) is widely used. The image control devices include a quad screen divider, a multiplexer, a matrix, and the like. The four-screen splitter is a device that receives four separate images and divides them into four on one monitor screen for simultaneous output. The multiplexer sequentially converts a plurality of camera images into one screen and stores camera images of up to 8 cameras in one storage device. The matrix is a device for displaying a plurality of images on a plurality of monitors in a cross point switching manner.

This monitoring system needs to be controlled by the user. Currently, the system keyboard is widely used to control surveillance systems. The system keyboard is sometimes called a keyboard or a system controller. The system keyboard controls a plurality of cameras, monitors and other components constituting the surveillance system. Using the system keyboard, the user can specify the position to be monitored by the camera or control the focal distance of the camera. The system keyboard also allows you to set the camera's preset position through the preset function. When the camera's pre-position is set, the user can have the camera monitor the pre-position by pressing the pre-position button of the corresponding camera on the system keyboard. In addition, the user can adjust the position of each camera of the camera system using the joystick of the system keyboard, and adjust the focal length of lenses included in or separately from each camera.

FIG. 1 shows an example of a conventional surveillance system using such a system keyboard.

The monitoring system of FIG. 1 includes a camera system composed of a plurality of cameras, two DVRs (Digital Video Recorder) 120 and 130 for storing images photographed by the camera system, And a system keyboard 110 for controlling the camera system and the monitors 121 and 131 and the DVRs 120 and 130.

Cameras constituting a camera system are mainly used in CCD (Chage-Coupled Device) cameras, but CMOS (complementary metal-oxide semiconductor) cameras are also used in recent years.

The DVRs 120 and 130 convert analog image data received from the camera system into digital signals, and compress the analog image data into a digital compression scheme, for example, an MPEG-2 scheme. The types to be recorded are Normal Record, Schedule Record, Event Record, and the like. Event recording refers to recording indicating video loss, alarm, motion detection, and the like. The compressed image data can be stored semi-permanently on the hard disk drive. When the user controls the control through the system keyboard 110 or the key switches on the front panel of the DVRs 120 and 130, the compressed video signal stored in the hard disk drive is restored and output. The output video signal is visually output by the monitors 121 and 131. [ The user can monitor images photographed through the camera system via the monitors 121 and 131. [

The system keyboard 110 allows a user to remotely control the camera system and the DVRs 120 and 130. For example, the system keyboard 110 can change the position where each camera of the camera system captures images by receiving a command from the user, and change the focal distance of each camera.

In the embodiment of FIG. 1, the video data of the camera # 1 to # 6 is input to the DVR 120, and the video data of the camera # 11 is input to the DVR 130.

In this case, the image data of the camera No. 6 in the first camera is outputted by the monitor 121 connected to the DVR 120, the image data of the camera No. 16 in the No. 11 camera is outputted to the monitor 131 connected to the DVR 130, . In this case, when the user wishes to simultaneously control the camera 1 and the camera 11, the user must look at the monitor 121 and the monitor 131, respectively. That is, the user can not control all the cameras while viewing one monitor. To solve these problems, additional expensive equipment such as a switcher or a matrix switcher is required. This hinders implementation of the surveillance system at low cost. In this case, if a system keyboard having a video input / output function is provided, it is possible to receive an image from the DVRs 120 and 130 and output it to a desired monitor 121 or 131. If a system keyboard having a video input / output function is provided, the user can output images obtained from respective cameras of the camera system to a single monitor selected by the user without installing additional equipment such as a switcher or a matrix switcher will be.

The present invention has been made in view of the above-mentioned needs, and it is an object of the present invention to provide a system keyboard having a video input / output function.

Another object of the present invention is to provide a system keyboard incorporating a display device capable of displaying input video data.

It is still another object of the present invention to provide a surveillance system using such a system keyboard.                         

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a system keyboard according to an embodiment of the present invention includes a video input port for receiving video signals from a plurality of channels, a user interface for receiving a command of a user, To a video signal input through the video input port in accordance with a command of the user, and transmits the selected video signal to at least one of the plurality of channels, A video processor for providing a video signal to be displayed using the video signal of the selected channel, and a display unit for displaying the provided video signal.

According to another aspect of the present invention, there is provided a system keyboard comprising: a video input port for receiving a video signal from a plurality of channels; a user interface for receiving a user command; To a video signal input through the video input port in accordance with a command of the user, and transmits the selected video signal to at least one of the plurality of channels, A video processor for providing a video signal to be displayed using the video signal of the selected channel, and a video output port for outputting the provided video signal to an external monitor.

According to another aspect of the present invention, there is provided a system keyboard including a video input port for receiving a video signal from a plurality of channels, a user interface for receiving a user command, A communication port for transmitting a signal to at least one of the devices constituting the monitoring system and a video signal of at least one of a plurality of channels of video signals inputted through the video input port in accordance with the user's command A video processor for providing a video signal to be displayed using the video signal of the selected channel, a display for displaying the provided video signal, and a video output port for outputting the provided video signal to an external monitor.

In order to achieve the above object, a surveillance system according to an embodiment of the present invention includes a plurality of cameras for receiving an optical signal and generating an electrical video signal, and controlling the cameras through communication, And a system keyboard for selecting a video signal of at least one of the video signals of the cameras according to a user's command and providing a video signal to be displayed using the video signals of the selected cameras.

The details of other embodiments are included in the detailed description and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram illustrating a configuration of a surveillance system according to an embodiment of the present invention.

The surveillance system includes a camera system 250, a system keyboard 210 having a video input / output function, and a monitor 240 for receiving and displaying video signals from the system keyboard. Also, the surveillance system may include one or more storage devices for storing images taken by the camera system 250, the embodiment of FIG. 2 including two DVRs 220 and 230.

A monitoring system may be implemented so that the monitoring system can be controlled at a plurality of places using a system keyboard having a video input / output function according to an embodiment of the present invention. However, in the following description, And the case where the system is implemented.

The camera system 250 includes at least one or more cameras that receive an optical signal and generate an electrical video signal. In one embodiment, the camera system 250 is controlled by receiving control signals from the system keyboard 210. For example, the user can change the position (direction) monitored by the camera using the system keyboard 210, zoom in or zoom out the camera.

In order to change the position of the camera, the camera system 250 must have camera driving equipment such as a pen tilt. Also, in order to use the zoom-in or zoom-out function, the camera system 250 must have a lens having a focus adjustment function. In most cases, the surveillance camera does not include a lens, but may also include a lens in the case of a particular camera. As such, the camera system 250 may be, but is not necessarily, controlled in accordance with the control signals of the system keyboard 210. For example, in the case of configuring a surveillance system with all cameras positioned and fixed in focus, control of the camera system 250 via the system keyboard 210 may be unnecessary.

The surveillance system may include at least one DVR for receiving and storing video signals from the camera system 250. In the embodiment of FIG. 2, the DVR 220 digitally compresses and stores the video signal captured by the camera # 6 in the camera # 1 included in the camera system 250, The digital camera compresses and stores the video signal captured by the camera No. 16 in the camera No. 11 included in the digital camera. The DVRs 220 and 230 may output analog video signals or digital video signals (captured by a camera including an analog-to-digital converter) to a digital compression system, such as MPEG-2, MPEG-4, H.263, H.264, MPEG-7, and MPEG-21. To this end, the DVRs 220 and 230 include a nonvolatile storage device capable of storing digital data, for example, a hard disk drive. Although the DVR has been described as an apparatus for storing video signals photographed by the camera system 250 in the present embodiment, the VCR (Video Cassette Recorder), which has been widely used in the past, may be used as a storage device of a surveillance system .

The system keyboard 210 controls each apparatus constituting the monitoring system. To this end, the system keyboard 210 receives commands from the user and controls the devices constituting the monitoring system. The system keyboard 210 according to the present invention has a video input / output function unlike a conventional system keyboard. Therefore, as shown in FIG. 2, the system keyboard 210 can receive analog video data or digital video data from the DVRs 220 and 230 and the camera system 250. The system keyboard 210 may output the received video data through a monitor 240 connected to the system keyboard 210. If a display device is included in the system keyboard 210, a surveillance system can be configured except for an external monitor 240. A more detailed description of the system keyboard 210 according to embodiments of the present invention will be described later.

The monitor 240 receives and outputs video data from the system keyboard 210. However, this is an example, and the monitor 240 may receive video data in the DVRs 220 and 230 as well as the system keyboard 210. The monitor 240 according to the embodiment of the present invention may be a liquid crystal display, but may be a cathode ray tube, a plasma display panel, an organic EL, or the like.

3 to 4 show the configuration of a system keyboard according to an embodiment of the present invention, respectively.

3, the system keyboard 300 includes a user interface 310 for receiving a user command, a control unit 320 for generating a control signal according to a user's command, a control unit 320 for generating A video input port 360 for inputting video data from the surveillance system; a video input port 360 for inputting video data input to the video input port 360; A video processor 340 for switching the video data of each channel according to the selected mode and generating a divided image, and a video processor 340 for outputting the switched channel or divided video through the video processor 340 And a display unit 370.

The user interface 310 includes a plurality of keys for receiving a command of a user, and may include a joystick for conveniently controlling the cameras. The user can control the position or focus of each camera using the user interface 310, and can set the initial position of each camera through the pre-positioning function. The system keyboard 300 may include a display unit 370 having an on-screen display (OSD) function. In this case, the display unit 370 may include some or all functions of the user interface 310 can do.

The control unit 320 generates a control signal according to a user's command input through the user interface 310. [ The control signal may be communicated to the respective devices of the monitoring system via the serial communication port 350. The controller 320 controls the video decoder 330 and the video processor 540 by generating an output mode command signal or a channel change command signal according to a user's command input through the user interface 310. [ Output modes and channel changes will be described later.

The serial communication port 350 transmits the control signal to each device of the monitoring system in a serial communication manner. The reason for using the serial communication scheme in this embodiment is that the necessity of high-speed communication is relatively small because a control signal is transmitted instead of a video signal, and a serial communication scheme is advantageous when communicating with a remote device. In addition, since the serial communication method is easy to implement, it can be implemented at a low cost. However, this is exemplary and other communication schemes may be used. For example, it is also possible to transmit the control signal using the TCP / IP communication method.

Serial communication methods can be broadly divided into asynchronous and synchronous methods. In the synchronous mode, the communicating devices must be synchronized with each other. When two devices communicate, when data is transmitted, the data must be transmitted according to the synchronized timing. For this purpose, control signals for synchronization should be transmitted at regular intervals even when there is no exchange of data. Unlike the asynchronous method, the synchronous method has a faster characteristic than the asynchronous method because it does not need a signal to notify the start and end of data once it is synchronized. In the asynchronous mode, the communicating devices need not be synchronized with each other. Instead, the beginning and end of the data require a signal that signals the start and end of the data. However, unlike the synchronous method, the asynchronous method does not need to transmit a control signal for synchronization. Embodiments of the present invention use asynchronous serial communication.

Of the asynchronous serial communication interfaces, RS232C, RS423, RS422, and RS485 are widely known. The RS232C supports one driver and one receiver communication, and it has maximum communication distance of 15m, maximum communication speed of 20Kbps, full duplex, maximum output voltage of +25 ~ -25V and maximum input voltage +15 ~ -15V. . RS423 supports 1 driver and 10 receivers communication, maximum communication distance 1.2Km, maximum communication speed 100Kbps, full duplex, maximum output voltage +6 ~ -6V, maximum input voltage +12 To -12V. RS422 supports 1 driver and 32 receivers communication, maximum communication distance 1.2Km, maximum communication speed 10Mbps, full duplex, maximum output voltage +6 ~ -0.25V, maximum input voltage + 7 to -7V. For RS485, 32 drivers and 32 receivers are supported. Maximum communication distance is 1.2Km, maximum communication speed is 10Mbps, half duplex, maximum output voltage is +12 to -7V, and maximum input voltage is +12 To -7V. Considering the characteristics of each serial communication method, the RS232C method can be used when implementing a close distance monitoring system, but it is difficult in case of a long distance. RS423, RS422, and RS485, it provides a maximum communication distance of 1.2 Km. Therefore, when implementing a long distance surveillance system, RS423, RS422, or RS485 can be used. However, both RS423 and RS422 are supported only for one driver, and two transmission lines are required because they are full duplex. Therefore, in consideration of these points, RS423 and RS422 may be used, but it is preferable to use RS485 as serial communication.

The video input port 360 receives video data from the monitoring system.

For example, referring to FIG. 2, each camera of the camera system 250 can receive captured video data and receive video data stored in the DVRs 220 and 230. Meanwhile, in the embodiment of the present invention, data input to the video input port 360 is mainly video data, but is not limited to video data. For example, the fifth camera can shoot still images at regular time intervals without performing video shooting. In this case, the data of the camera No. 5 input to the video input port 360 is still picture data. Hereinafter, the video data will be described with reference to the description, and in some cases, the word video data may be used as a concept including still image data. Each device that transmits video data to the video input port 360 has a different channel. For example, in camera # 1, channel # 6 is allocated to camera # 6, channel # 11 is assigned camera # 16, and channel # 16 is assigned camera # 16. DVRs 220 and 230 Channels 7 and 8, respectively, may be assigned. The video data of each channel is input through the video input port 360. When the data is compressed by the digital compression method, the video data is decoded through the video decoder 330. [

The video decoder 330 receives compressed video data in a digital compression format such as MPEG-2, MPEG-4, H.263, H.264, MPEG-7, And decodes the compressed video data by a decoding method corresponding to the decoded video data, thereby reconstructing the video data. On the other hand, when the still picture data compressed by the JPEG2000 method based on the DCT method or the wavelet transform method based on the wavelet transform method is inputted, the video decoder 330 decodes the still picture data compressed by the decoding method corresponding to the compressed method And the still image is reconstructed. On the other hand, if the data input to the video input port 360 is uncompressed data, a video decoding process may be unnecessary.

The video processor 340 switches the video data to a channel selected by the user, generates an analog video signal to be displayed from the video data of the selected channel, and outputs the analog video signal to the display unit 370. In addition, the video processor 340 reconstructs the video data to be displayed according to the mode selected by the user, generates an analog video signal to be displayed from the reconstructed video data, and outputs the analog video signal to the display unit 370.

The display unit 370 receives the analog video signal from the video processor 340 and outputs a video image that can be viewed by a person. The display unit 370 may be a cathode ray tube, a plasma display panel, an organic EL, or the like, but is preferably a liquid crystal display. This is because the cathode ray tube has a large thickness and the plasma display panel generates a large amount of heat. Also, organic EL is less commercialized than liquid crystal display devices. In this embodiment, since the system keyboard 300 includes the display unit 370, a surveillance system can be implemented using the system keyboard 300 of the present embodiment without a separate external monitor.

Each component of the system keyboard described above may be implemented in hardware such as an FPGA or ASIC, but may also be implemented in software. However, these components are not meant to be limited to hardware or software. Each component may be configured to reside on an addressable storage medium and configured to execute one or more processors. Also, components can be combined into a smaller number of components or further separated into additional components. 3, the control unit 320, the video decoder 330, and the video processor 340 may include one microprocessor having a computing capability, a control unit 320, a video decoder 330, and a video processor 340 And the like. This can be equally applied to each component described below.

4, the system keyboard 400 includes a user interface 410 for receiving commands from a user, a control unit 420 for generating control signals according to user commands, A video input port 460 for inputting video data from the surveillance system, a video input port 460 for inputting video data input to the video input port 460, A video processor 440 for switching the video data of each channel according to the selected mode and generating a divided image and a video processor 440 for switching the switched channel or divided image to the outside And a video output port 480 for delivering video data to a monitor of the computer.

The user interface 410, the control unit 420, the serial communication port 450, the video input port 460, the video decoder 430 and the video processor 440 are the same as the corresponding parts in FIG. Function, and therefore reference is made to the description of the corresponding parts of Fig. In this embodiment, unlike the embodiment of FIG. 3, since the display unit is not included, the role of the user interface 410 can not be shared by the display unit. However, if a separate display device for only the OSD is provided, the display device can partly or wholly share the role of the user interface 410.

The present embodiment differs from the embodiment of FIG. 3 in that it does not separately include a display portion but instead includes a video output port 480. When a monitoring system is implemented using the system keyboard shown in FIG. 3, an external monitor is not needed, so an inexpensive monitoring system can be implemented. However, it is difficult to easily change the screen size of the display unit included in the system keyboard. Therefore, the system keyboard 400 according to the present embodiment includes a video output port 480 for outputting an analog video signal to an external monitor in place of the display unit, thereby maintaining the video input / output function of the system keyboard, The display unit can be manufactured more inexpensively than the display unit 300. However, when a monitoring system is implemented using the system keyboard 400 according to the present embodiment, a separate monitor is essential.

5, the system keyboard 500 includes a user interface 510 for receiving a user command, a control unit 520 for generating a control signal according to a user's command, A video input port 560 for inputting video data from the surveillance system, a video input port 560 for inputting video data input to the video input port 560, A video processor 540 for switching the video data of each channel according to the selected mode and generating a divided image according to the selected mode and a video processor 540 for outputting the switched channel or divided video through the video processor 540 And a video output port (not shown) for delivering the switched channel or divided video through the video processor 540 to an external monitor 580).

The user interface 510, the control unit 520, the serial communication port 550, the video input port 560, the video decoder 530, the video processor 540, 3, and therefore reference is made to the description of the corresponding parts of FIG. Also, the video output port 580 has the same function as the video output port 480 of FIG. 4, and therefore, see the description of the video output port 480 of FIG.

 The present embodiment differs from the embodiment of FIG. 3 in that it further includes a video output port 580, and a portion different from the embodiment of FIG. 4 further includes a display portion 570. When implementing the monitoring system using the system keyboard 500 according to the present embodiment, as in the case of implementing the monitoring system using the system keyboard 300 shown in FIG. 3, since there is no need for an external monitor, an inexpensive monitoring system can be implemented .

When a monitoring system is implemented using the system keyboard 500 according to the present embodiment, a video output port 580 for outputting an analog video signal to an external monitor is provided as in the system keyboard 500 of FIG. 4 Therefore, the user can view the video image through a monitor having a monitor having various screen sizes.

6 is a block diagram illustrating an operation of a system keyboard according to an embodiment of the present invention.

First, when the power of the system keyboard is turned on, the system keyboard outputs the basic video through an internal display unit or an external monitor (S610). The basic video image means the output mode and the video image of the channel which are set as default. For example, the first channel video image of the single mode may be set to a default value. In this case, when the system keyboard is powered on, the video image of the first channel is output through an internal display unit or an external monitor. In addition, the basic video image may be a video image of an output mode and a channel immediately before the power of the system keyboard is turned off. In this case, when the system keyboard is turned on, the output mode immediately before the power of the system keyboard is most recently turned off And a video image of the channel.

Then, the system keyboard determines whether a user command is input (S620). If the command of the user is not inputted, the current state is maintained, and if the command of the user is inputted, it is determined what command is the command of the user (S630).

If the command of the user is a control command, the system keyboard controls the apparatus selected by the user of the monitoring system according to the command of the user (S640). For example, when the user instructs the camera 1 to change the position to be photographed, the system keyboard sends a control signal to the camera 1 to change the position of the camera 1. If the user instructs to zoom in camera # 2, the system keyboard sends a command to zoom camera # 2 to camera # 2.

If the command of the user is an output mode command, the system keyboard changes the output mode of the screen displayed on the display unit in the system keyboard or on an external monitor in operation S650. In the embodiment of the present invention, there are three types of output modes. In the first mode, the video image of the channel selected by the user is outputted to the internal display unit of the system keyboard or the external monitor in the single mode. The second mode is a split mode. In the split mode, a screen displayed on an internal display or an external monitor of the system keyboard is divided and video images of a plurality of channels are output on each divided screen. That is, the video screen of several channels selected in the split mode is reduced and combined.

In other words, in the quad mode, the 4-channel video screen is reduced to 1/4 size, and the reduced 4-channel video screen is output to the screen through the internal display unit or the external monitor of the system keyboard. Finally, in the sequence mode, the video images of a plurality of channels are sequentially output to the internal display or the external monitor of the system keyboard at a predetermined time interval in the sequence mode. The output modes described above are exemplary and other output modes may be further included. For example, in the split sequence mode, a video image of a plurality of channels is output to one monitor. Video images of a plurality of channels are sequentially output at intervals of a predetermined time interval.

7 is a diagram illustrating video output according to one embodiment of the present invention. Referring to FIG. 2, it is assumed that channel 1 is assigned to channel 6 in camera # 1, channel # 6 is assigned to camera # 6, and channel # 16 is assigned to camera # 11 in camera # 11.

First, when the user selects channel 1 in the single mode, both the display unit and the external monitor output the image of camera # 1. In the single mode, when the user selects channel 3, both the display unit and the external monitor output the image of the camera No. 3. To do this, the video processor switches to the selected channel and provides the video image of the switched channel to the display or external monitor.

In the case of the user selected channels 1, 3, 11, and 13 in the four-division mode, the external monitor outputs the video images of the camera 1, the camera 3, the camera 11, and the camera 13 in 1/4 size. To do this, the video processor of the system keyboard reduces the video images of channels 1, 3, 11, and 13 to 1/4, and combines the reduced video images to generate one video image to be output. The generated video image is provided to a display unit or an external monitor. However, the video processor of the system keyboard sequentially outputs video images of camera # 1, camera # 3, camera # 11 and camera # 13.

This is because the display portion included in the system keyboard has a small screen because it can not have a large screen, and therefore, if the video image is reduced to 1/4, it may be hard for the user to recognize. To do this, the video processor of the system keyboard switches video images of channels 1, 3, 11, and 13 at regular time intervals. The switched video image is provided to the display unit or an external monitor. However, this is an illustrative example, and if the screen of the display portion of the system keyboard is large enough, it may output four video images reduced to 1/4. Similarly, in the case of an external monitor, if the size of the monitor is insufficient, it may be reduced to 1/4, and four images may be sequentially output instead of four video images.

On the other hand, when the user selects channels 11, 13, 1 and 3 in the 4-division mode, the external monitor outputs video images of the 11th camera, 13th camera, 1th camera and 3th camera in 1/4 size do. However, the display unit of the system keyboard sequentially outputs the video images of the camera # 11, the camera # 13, the camera # 1, and the camera # 3.

In the sequence mode, when the channel selected by the user is 1, 3, 11, or 13, the outputs of the display unit and the external monitor sequentially output the video images of the first camera, the third camera, the 11th camera and the 13th camera.

In the above description, the division mode or the sequence mode has been described as using four channels of video signals, but this is merely exemplary and it is also possible to use video signals of a number other than four. For example, a split mode using two, six, or eight channels of video signals is possible, and a sequence mode using two, three, or five channels of video signals is possible. However, the present invention is not limited thereto.

Therefore, it is needless to say that the present invention is not limited by the embodiments and drawings disclosed in this specification, and various modifications may be made by those skilled in the art within the scope of the invention.

According to the embodiment of the present invention, since the system keyboard has a video input / output function, the surveillance system can be implemented inexpensively without a separate switcher or a matrix switcher.

Also, according to the embodiment of the present invention, the user can intensively control or monitor the surveillance system through the display unit in the system keyboard or the external monitor.

Claims (23)

A video input port for receiving video signals from a plurality of channels; A user interface for receiving user commands; A communication port for transmitting a control signal according to the command of the user to at least one devices constituting the monitoring system; A video processor for selecting at least one video signal of a plurality of video signals input through the video input port in accordance with the user's command and providing a video signal to be displayed using the video signal of the selected channel; And And a display unit for displaying the provided video signal, Wherein the selected video signal is a video signal of a predetermined number of channels and wherein the video processor reduces and combines the video signal of the selected channel to produce a video image to be displayed. The method according to claim 1, Wherein the video processor switches to the selected channel. delete The method according to claim 1, Wherein the selected video signal is a video signal of a predetermined number of channels and the video processor switches video signals of the selected channel and provides a video image to be displayed. The method according to claim 1, Wherein the display unit is a liquid crystal display device. The method according to claim 1, And the communication port is an RS485 communication port. A video input port for receiving video signals from a plurality of channels; A user interface for receiving user commands; A communication port for transmitting a control signal according to the command of the user to at least one devices constituting the monitoring system; A video processor for selecting at least one video signal of a plurality of video signals input through the video input port in accordance with the user's command and providing a video signal to be displayed using the video signal of the selected channel; And And a video output port for outputting the provided video signal to an external monitor Wherein the selected video signal is a video signal of a predetermined number of channels and wherein the video processor reduces and combines the video signal of the selected channel to produce a video image to be displayed. 8. The method of claim 7, Wherein the video processor switches to the selected channel. delete 8. The method of claim 7, Wherein the selected video signal is a video signal of a predetermined number of channels and the video processor switches video signals of the selected channel and provides a video image to be displayed. 8. The method of claim 7, And the communication port is an RS485 communication port. A video input port for receiving video signals from a plurality of channels; A user interface for receiving user commands; A communication port for transmitting a control signal according to the command of the user to at least one devices constituting the monitoring system; A video processor for selecting at least one video signal of a plurality of video signals input through the video input port in accordance with the user's command and providing a video signal to be displayed using the video signal of the selected channel; A display unit for displaying the provided video signal; And And a video output port for outputting the provided video signal to an external monitor, Wherein the selected video signal is a video signal of a predetermined number of channels and wherein the video processor reduces and combines the video signal of the selected channel to produce a video image to be displayed. 13. The method of claim 12, Wherein the video processor switches to the selected channel. delete 13. The method of claim 12, Wherein the selected video signal is a video signal of a predetermined number of channels and the video processor switches video signals of the selected channel and provides a video image to be displayed. 13. The method of claim 12, Wherein the video signal selected is a video signal of a predetermined number of channels and the video processor reduces and combines the video signal of the selected channel to provide to the video output port and switches the video signal of the selected channel And providing a video image to the display unit. 13. The method of claim 12, Wherein the display unit is a liquid crystal display device. 13. The method of claim 12, And the communication port is an RS485 communication port. A plurality of cameras receiving an optical signal and generating an electrical video signal; And And a controller for controlling the cameras, receiving video signals from the cameras, selecting video signals of at least one of the video signals of the cameras according to a user's command, and using the video signals of the selected cameras, Includes a provided system keyboard Wherein the selected video signal is a video signal of a predetermined number of channels and the system keyboard generates a video image to be displayed by reducing and combining the video signal of the selected channel. 20. The method of claim 19, And a monitor for receiving and displaying the provided video signal. 20. The method of claim 19, Wherein the system keyboard includes a display unit for displaying the provided video signal. 20. The method of claim 19, Further comprising a monitor for receiving and displaying the provided video signal, wherein the system keyboard further comprises a display unit for displaying the provided video signal. 20. The method of claim 19, Wherein the communication method is an RS485 communication method.

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