KR200321225Y1 - Camera synchronous control device - Google Patents

Abstract

The present invention relates to a synchronous control device of the camera (Apparatus for line-locking of camera) for allowing a user to simultaneously or sequentially view each image according to a plurality of surveillance cameras,

The present invention synchronizes the video signals of a plurality of surveillance cameras through computer communication instead of the conventional synchronous separation circuit, so that an accurate switching operation can be performed when images according to each surveillance camera are sequentially switched out or simultaneously output. 튐 Improvement and quality editing can be performed, and since the wiring which previously provided the external synchronization signal for synchronizing the video signal of each surveillance camera is not necessary, the installation can be easily provided.

Description

Camera synchronous control device

The present invention relates to a synchronous control apparatus of a camera for allowing a user to simultaneously or sequentially view each image according to a plurality of surveillance cameras, in particular, images transmitted from each surveillance camera. The present invention relates to a synchronous control apparatus of a camera for improving screen quality and obtaining high quality editing effects when sequentially monitoring or simultaneously monitoring each camera when recording.

Recently, with the rapid development of the video industry, the industry using the same has been actively promoted in various fields. Among them, the broadcasting industry through broadcast media, the advanced imaging industry using lasers and other light beams, and the video industry that can be easily used in homes and public places are well known.

However, in the banks, public industries, department stores or stores, surveillance systems using a plurality of surveillance cameras are separately installed and used for the purpose of preventing theft and safety. At this time, the surveillance system is mainly used to install a closed circuit TV (hereinafter referred to as CCTV).

As shown in FIG. 1, the CCTV controls a plurality of surveillance cameras C installed at a place designated by a user as an external photographing apparatus, and each video output transmitted from the surveillance camera C to control results. A switching unit S for generating and outputting an image control signal, and a time-lapse VCR 1 for receiving low-speed shooting or display by receiving the image control signal from the switching unit S; And a monitor 2 for receiving the image control signal and displaying the image sequentially or simultaneously.

In general, the time-lapse video recording player 1 is installed and used in a place where surveillance is required to prevent theft, such as a bank or a museum, and does not record a video frame input through an external photographing device in real time in real time. By repeating the driving and stopping of the recording tape at predetermined time intervals, the selected frame is recorded among the video screens input from the external photographing apparatus, so that it can be used for long-term surveillance observation.

In particular, the operation of the switching unit S will be described in more detail with reference to FIG. 2, the power input unit 3 to which an AC voltage of 24V is applied, the monitor 2 or the switching signal, and the like. A switch 4 for selecting one of the synchronized external synchronization signals or for generating a video signal synchronized with a 24V AC voltage and allowing each of them to be transmitted to the system, and synchronizing with a 24V AC power supply at the switch 4 When the video signal is transmitted, the key input unit 5 performs external adjustment through key input to synchronize with the main monitoring area, and when the external synchronization signal is received, the surveillance camera C accordingly. ), I.e., generates a switching signal synchronized with a video signal such as CAMERA 1, CAMERA 2, CAMERA 3, and transmits it to the system, and the switching signal of the surveillance camera C And a controller 6 for controlling the video signal so that the simultaneous screen output can be progressed through the first monitor 2a or the quad monitor 2b divided according to the control result. .

At this time, the system performs a central control such that a line-lock function for synchronizing the video signal of the surveillance camera C and the switching signal of the switching unit S is performed. In this way, when the line-lock function is performed, it is easy to synchronize the image.

In addition, the switching unit S generates and outputs a screen change signal through a program of the system or the key input unit 5 for screen change as well as screen output so that the screen change can proceed after a predetermined delay time.

Here, as shown in FIG. 3, the video signal of the surveillance camera C may be separated into a video signal and a synchronization signal, and the synchronization signal has a constant synchronization period 1V between the plurality of surveillance cameras C. The switching signal of the switching unit (S) is the image output of each monitoring camera (C) after the screen output for a predetermined time through the monitor (2) sequentially after the video output of the other monitoring camera (C) It is formed with a number of synchronization periods to proceed.

Referring to FIGS. 4 and 5, a synchronous control apparatus of a camera according to the related art, when a 24 V AC voltage is input through the power input unit 3, performs a rectifying operation to obtain a DC from the AC voltage. At the same time, a smoothing action for removing ripple is added, and when a sync signal is transmitted from the video signal of the surveillance camera C together with a video signal to make the contrast of the screen, the sync signal is extracted by amplitude separation, and then the sync signal is extracted. A frequency separation is performed by the difference of the frequency components to separate the horizontal synchronization signal and the vertical synchronization signal, respectively, and the synchronization separation circuit unit VD detects the vertical synchronization signal as a result of the separation, and the PC 7 and the communication protocol (protocol). ) Generates and outputs control signals so that internal programs, including external commands, can be transmitted to the system or the use of synchronization signals can be specified. The monitor 2 is processed by receiving the microcomputer 8, the vertical synchronization signal of the synchronous separation circuit unit VD, and the control signal of the microcomputer 8, thereby processing the video signals of the plurality of surveillance cameras C. The camera signal processor 9 allows an image output to be processed through an analog signal, and an analog / digital converter 9 'for converting and outputting an analog signal into a digital signal that can be processed by the system when an analog signal is input from each unit.

Here, in the signal waveform diagram shown in FIG. 5, an AC voltage is applied in the region (A) to cover the regions (B), (C), (D), (E), and (F) of the synchronous separation circuit unit VD. The signal flow until the vertical synchronization signal having a constant synchronization period (1V) is input to the camera signal processor 9 is well shown.

On the other hand, when the DC voltage is applied, the synchronization signal separated by the switching unit S or the monitor 2 is input and used.

In FIG. 4, reference numerals R1, R2, R3, ... denote resistances, reference numerals VR1, VR2 denote variable resistances, and reference numerals D1, D2, D3, ... denote diodes. Indicates. Reference numeral C denotes a capacitor, and reference numerals Q and OP denote transistors and amplifiers, respectively. Reference numerals F1 and F2 denote flip-flops. 5, reference numerals VD2 and VD3 denote respective voltages at the D2 and D3.

The operation of the synchronous control apparatus of the conventional camera configured as described above is as follows.

According to the video signals of the plurality of surveillance cameras (C) by using a single monitor (2) to divide the screen into a plurality of simultaneous video output or to perform each video output sequentially, the surveillance camera (C) Since the screen is difficult to edit due to the asynchronous operation of each vertical synchronization of), the line-lock function is performed.

That is, the video signal of the surveillance camera C is generated by synchronizing with the 24V AC power input or the external synchronization signal is synchronized with the switching signal of the monitor 2 or the switching unit S to the surveillance camera C. You must enter it.

In this case, in the case of a 24V AC power supply, there is a problem in that external adjustment must be performed through a key input unit 5 to synchronize the video signal with a main monitoring area, and when the external synchronization signal is inputted, There is a problem in that wires must be provided in each of the monitoring cameras C to transmit the external synchronization signal.

Further, in order to perform the line-lock function, a vertical synchronization signal must be separated through a synchronous separation circuit unit (VD) composed of a complicated circuit.

The present invention has been made to solve the above problems of the prior art, the purpose is to synchronize the video signal of a plurality of surveillance cameras through computer communication instead of a synchronous separation circuit to output the image according to each surveillance camera sequentially Alternatively, when simultaneously outputting, accurate switching operation can be performed, improving screen quality and quality editing can be performed, and there is no need to provide an external synchronization signal for synchronizing a video signal of each surveillance camera. An object of the present invention is to provide a synchronous control apparatus for a camera that can be easily installed.

1 is a block diagram showing the configuration of a general CCTV,

2 is a block diagram showing the operation of the switching unit in FIG.

3 is a waveform diagram illustrating a signal according to the switching operation of FIG. 2;

4 is a circuit diagram showing a synchronous separation circuit for detecting a synchronous signal in a synchronous control apparatus of a camera according to the prior art;

FIG. 5 is a waveform diagram illustrating signals of respective units in FIG. 4; FIG.

6 is a block diagram illustrating a synchronous control apparatus of a camera according to the present invention;

FIG. 7 is a diagram illustrating signal waveforms in which signals of respective surveillance cameras are synchronized by FIG. 6;

8 is a block diagram illustrating a switching operation for outputting an image according to each surveillance camera in a synchronous control apparatus of a camera according to the present invention;

9 is a diagram illustrating a signal flow of each part in FIG. 6;

<Explanation of symbols on main parts of the drawings>

10: computer main body 20: microcomputer

30: clock reset unit 40: signal processing unit

50: analog / digital conversion unit 60: power input unit

70: synchronization separator 80: control unit

M: Monitor SW: Switching Unit

SW1: Switch C: Surveillance Camera

According to a first aspect of a synchronous control apparatus of a camera according to the present invention for solving the above problems, by controlling the system to sequentially output or simultaneously output the image according to the video signal of a plurality of surveillance cameras A computer main unit which transmits the control result to the system, and when the computer main unit performs communication control with a plurality of surveillance cameras, generates a synchronous control signal and sequentially transmits the control signal to each surveillance camera. Is synchronized with the signal control unit for transmitting it to the system, a synchronization separator for receiving the synchronized video signal and detecting vertical synchronization signals therefrom, and selectively detecting the reference synchronization signal from a reference power source or a monitor. Until the reference synchronization signal is synchronized with the separated vertical synchronization signal. By time delay it is configured to include a microcomputer which allows to proceed to the video output of the plurality of surveillance cameras accordingly generates a switching signal constituting the synchronization with the vertical synchronization signal.

Here, when the microcomputer simultaneously outputs the image by the video signal of each surveillance camera on a plurality of divided screens, the microcomputer generates a phase locked signal that matches the vertical synchronization signal with the reference synchronization signal of the monitor and transfers it to the system. Done.

Hereinafter, an embodiment of a camera synchronous control apparatus according to the present invention will be described with reference to the accompanying drawings.

FIG. 6 is a block diagram illustrating a synchronous control apparatus of a camera according to the present invention. FIG. 7 is a view illustrating a signal waveform in which signals of respective surveillance cameras are synchronized by FIG. 6, and FIG. 8 is a camera according to the present invention. FIG. 9 is a block diagram illustrating a switching operation for outputting an image according to each surveillance camera in the synchronous control device of FIG.

6 to 9, in order to drive the system, a power input unit 60 through which an AC voltage of 24 V is input to a reference power source and a plurality of surveillance cameras C are controlled or each video of the surveillance cameras C is controlled. The computer main body 10, which is externally adjusted by a user or adjusted by an internal program for outputting an image according to a signal, and the computer main body 10 communicate with each other by a communication protocol and accordingly the system The microcomputer 20 generates a synchronous control signal and transmits the synchronous control signal to the system so that the video signals of the surveillance cameras C may be synchronized with each other at the initial communication, and the synchronous control signal of the microcomputer 20 is transmitted. Generates and outputs a clock reset signal to reset the clock of each surveillance camera C accordingly and to synchronize each video signal sequentially for a certain period (V). Is a clock reset unit 30, a signal processor 40 which is connected to the microcomputer 20 or the clock reset unit 30 to control and process each signal to generate a mutually synchronized video signal, and each unit When the analog signal is input from the analog / digital conversion unit 50 for converting the output into a digital signal that can be processed by the system is included.

Reference numerals D and C which are not described in FIG. 6 denote diodes and capacitors, respectively.

Here, the video signal of the surveillance camera (C) may be separated into a video signal and a synchronization signal, wherein the synchronization signal is composed of a horizontal synchronization signal and a vertical synchronization signal. Therefore, as shown in FIG. 7, the clock reset unit 30 first synchronizes the vertical synchronization signal by resetting the first signal of the clock reset signal having a predetermined period (V) and the clock of the camera 1, and then The CAMERA 2 is moved for a period of V to synchronize with the second signal of the clock reset signal. In this manner, the vertical synchronization signal of the other surveillance cameras C and the clock reset signal are synchronized so that the video signals of the surveillance cameras C are synchronized with each other.

After all, the configuration as described above is for synchronizing the vertical synchronization signal of the surveillance camera (C) to a general CCTV operation briefly see the configuration of the CCTV, a plurality of surveillance installed in a user-designated place as an external photographing device A switching unit SW for controlling each video output transmitted from the camera C, the plurality of monitoring cameras C, and generating and outputting an image control signal according to the control result, and an image of the switching unit SW. And a time-lapse VCR for receiving a control signal and performing a low-speed shooting or display, and a monitor for receiving the image control signal and displaying the video sequentially or simultaneously.

As shown in FIG. 8, the operation of the switching unit SW will be described in more detail. The power input unit 60 to which the reference power of 24V AC is input and the images according to the plurality of surveillance cameras C are displayed to the user. A monitor SW, a switch SW1 for selecting any one of the reference synchronization signals generated by the power input unit 60 or the monitor M, and each video signal of the surveillance camera C. Receiving a synchronous separation unit 70 that detects and transmits a vertical synchronous signal to the system, and receives a reference synchronous signal selected by the switch SW1 and a vertical synchronous signal separated and detected by the synchronous separation unit 70. It is configured to include a control unit 80 for generating and outputting a switching signal to control the screen output of the monitoring camera (C).

In particular, as shown in FIG. 9, since the reference synchronization signal and the vertical synchronization signal do not coincide with each other, the controller 80 has a predetermined delay time T _d after the reference synchronization signal is input. When a signal is input, a switching signal synchronized with the vertical synchronization signal is generated so that images according to CAMERA 1, CAMERA 2, CAMERA 3, ..., etc. are sequentially displayed on the monitor M during a predetermined period of the switching signal. Done.

In this case, when the monitor (M) is divided into four divided screens, the switching unit (SW) inputs the vertical synchronization signal separated and detected by the synchronization separating unit (70) to the monitor (M), and the monitor Inside (M), the reference synchronization signal and the vertical synchronization signal generate a phase locked signal that is completely synchronized or coincident so that images by multiple surveillance cameras C can be simultaneously output.

Here, a phase lock loop (hereinafter referred to as a PLL) circuit is provided inside the monitor M, so that a phase lock in which the reference synchronization signal and the vertical synchronization signal of the monitor M are synchronized through the PLL circuit is performed. The signal will be generated.

Looking at the operation of the synchronization control device of the camera according to the present invention configured as described above are as follows.

First, CCTVs will be installed to prevent theft or maintain safety in banks, government offices, shops and parking lots. These CCTVs are installed at a plurality of angles at a specified position of a plurality of surveillance cameras (C) so that the image taken by each surveillance camera (C) is displayed on the monitor (M), recorded by date, and played back if necessary It can be used.

However, in order to monitor the image by the surveillance camera C, the computer main body 10 controls the video signal of each surveillance camera C by a program externally adjusted or already set by the user.

That is, the computer main body 10 and the microcomputer 20 communicate with each other to generate a synchronization control signal for synchronizing the video signals of the surveillance cameras C at the beginning of the communication, and the synchronization control signal resets the clock. When transmitted to the unit 30, the clock reset unit 30 resets the clock of each surveillance camera C through the clock reset signal to sequentially synchronize each video signal for a predetermined period (V).

When the synchronized video signal is input to the switching unit SW, in the switching unit SW, any one of the reference synchronization signal among the reference power source or the monitor M having the AC voltage of 24V is mutually interrelated. The synchronization signal 70 generates a switching signal so as to output a high quality screen in synchronization, and the synchronization separator 70 detects a vertical synchronization signal from the video signal and transfers it to the controller 80. The reference synchronization signal of any one of the reference power source or the monitor M is selected, and the result of the selection is transmitted to the controller 80.

Accordingly, the controller 80 receives the reference synchronization signal and the vertical synchronization signal, and generates a switching signal synchronized with the vertical synchronization signal with a predetermined delay time T _d . ) Can be sequentially output through the monitor (M).

On the other hand, the switching unit SW directly transmits the vertical synchronization signal to the quadrant monitor M so that the reference synchronization signal and the vertical synchronization signal are completely matched through the PLL circuit inside the monitor M. It generates a phase-fixed signal to be able to simultaneously output the image by the plurality of surveillance cameras (C) to the monitor (M).

Synchronous control apparatus of the camera according to the present invention is configured as described above by synchronizing the video signals of a plurality of surveillance cameras through computer communication instead of the conventional synchronous separation circuit, the image according to each surveillance camera is sequentially switched output or simultaneous output In this case, it is possible to perform accurate switching operation, so that the screen can be improved and high-quality editing can be performed, and it is easy to install because it eliminates the need for the external synchronization signal for synchronizing the video signal of each surveillance camera. There is an effect that can be done.

Claims (2)

A computer main unit which controls the system so as to sequentially output or simultaneously display images according to video signals of a plurality of surveillance cameras, and transmits the control result to the system; A signal control unit which generates a synchronous control signal when performing communication control and transmits it to each surveillance camera sequentially, and transmits it to the system when each video signal is synchronized as a result of the transmission, and receives the synchronized video signal and is vertical among them. A synchronizing separator for separating and detecting a synchronizing signal, and selectively detecting a reference synchronizing signal at a reference power supply or a monitor and delaying the reference synchronizing signal for a predetermined time until the reference synchronizing signal is synchronized with the separated vertical synchronizing signal. To generate a switching signal that is synchronized with the signal Synchronous control apparatus for a camera, characterized in that configured to include a microcomputer to allow the progress monitoring the video output of the camera can. The method of claim 1, The microcomputer generates a phase-locked signal that matches the vertical synchronization signal with the reference synchronization signal of the monitor when simultaneously outputting an image by a video signal of each surveillance camera on a plurality of divided screens, and transmits it to a system. A synchronous control device for a camera.