JP2001157197A - Supervisory camera system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supervisory camera system, with which the condition of a job site can be grasped clearly, while keeping signal lines a little. SOLUTION: When a start signal is received from a remote controller, a camera controls driving of motors 217-219 on the basis of an operating signal stored in a memory 223 and performs each of operations, such as panning, tilting and zooming. During this operation, a video signal provided by a CCD 203 and an audio signal provided by a microphone 213 are inputted to a signal multiplexing part 211 and frequency modulations are respectively suitably loaded. Then, multiplex transmission is performed and signals from the respective cameras are transmitted in a time-division manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance camera system, and more particularly to a control device for remotely controlling a plurality of cameras connected to one of a common signal line in a bus shape and a plurality of cameras connected to the other of the common signal lines. And a surveillance camera system.

[0002]

2. Description of the Related Art Conventionally, in a surveillance camera system, a plurality of surveillance cameras are provided in order to monitor a larger area or to obtain more information even when monitoring a certain area. Often used. In this case, it is common to use one signal line for each camera and connect it to a control device corresponding to each camera.

FIG. 8 is a block diagram schematically showing a conventional surveillance camera system using such a plurality of signal lines. Referring to this figure, the surveillance camera system
The camera includes cameras 801 to 804, control devices 805 to 808 for controlling the cameras, and monitors 809 to 812 for displaying images from the cameras. And the camera 80
1 to 804 and control devices 805 to 808 are connected by signal lines 81 to 84, respectively.

As described above, since a signal line, a control device, and a monitor are provided for each camera, signal lines, control devices, and monitors for the number of cameras installed are required. For this reason, when the number of installed cameras is large, not only the cost is increased and the wiring work is difficult, but also the appearance is very unsightly.

In view of such a problem, a surveillance camera system in which the number of control devices and monitors is reduced has been proposed. FIG. 9 is a configuration diagram schematically showing a surveillance camera system when one control device and one monitor are used for a plurality of cameras.

Referring to FIG. 9, a surveillance camera system comprises:
Cameras 901 to 904, control device 905, monitor 9
07. The signal lines 911 to 914 from each of the cameras 901 to 904 are connected to one control device 905, and the video is divided and displayed on one monitor 907. That is, each image sent by the four cameras 901 to 904 is divided into four divided A to
D is projected at the corresponding position.

In such a surveillance camera system as well, since the number of signal lines is equal to the number of cameras, if the number of cameras is large, the amount of wiring will be large, and the problems of difficulty in construction and increase in cost can be solved. could not.

In order to solve such a problem, Japanese Patent Application Laid-Open No. Hei 10-257478 discloses a technique for keeping a small amount of wiring even when a large number of cameras are installed. In this method, a single signal line is used for a plurality of cameras, and a video signal or the like is time-division multiplexed and transmitted to the single signal line. Therefore, 1
Images from a plurality of cameras are sequentially displayed on one monitor.

[0009]

However, the technique disclosed in Japanese Patent Application Laid-Open No. H10-257478 has a problem that it is difficult to clearly know the situation at the site. That is, in this technique, since images transmitted in time division from a plurality of cameras to one monitor are merely displayed sequentially, the image that can be viewed by the observer through the monitor is one. Only those obtained from one camera.

[0010] Moreover, since each camera is fixed, the obtained image is in a fixed range. Therefore, there is very little information that the observer can obtain during a certain period of time before the video is switched, and it is not sufficient to clearly grasp the situation at the site.

In order to simultaneously display images from a plurality of cameras in real time in order to obtain sufficient information,
Since a plurality of signal lines are required, problems such as the above-described difficulty of construction and increase in cost arise.

The present invention has been conceived in view of the above circumstances, and an object of the present invention is to provide a surveillance camera system capable of clearly grasping the situation of a site while keeping the number of signal lines small.

[0013]

According to one aspect of the present invention, a plurality of cameras connected in a bus to a common signal line and a plurality of cameras controlled via the signal lines are provided. A video signal obtained from a plurality of cameras is transmitted in a time-division manner on a signal line. In a surveillance camera system, the control device performs pan, tilt, stop, zoom, and other operations on a camera. The camera includes an operation signal transmitting unit that transmits an operation signal for causing the camera to operate, and the camera includes an operation unit that performs an operation based on the transmitted operation signal.

According to the present invention, since a plurality of cameras and control devices are connected to a common signal line, only one signal line is required. The video signal from each camera is transmitted in a time-division manner. However, since the camera itself can perform operations such as pan, tilt, stop, and zoom, the obtained video is a video of a fixed area. Instead, it is a wide and detailed image. For this reason, it is possible to provide a surveillance camera system that can clearly grasp the situation of the site while keeping the number of signal lines small.

[0015] Preferably, in the surveillance camera system, the camera has an audio acquisition unit for acquiring audio, and the audio signal acquired from the audio acquisition unit is time-divided on a signal line together with a corresponding video signal. Sent.

According to this, since the audio signal can be obtained together with the video signal transmitted in a time-division manner, it is possible to more clearly know the situation at the site.

More preferably, in the surveillance camera system, the control device further includes a start signal transmitting unit for transmitting a start signal to the camera, and a switching unit for switching a destination of the start signal, wherein the camera is connected to the control device by the control device. When a start signal is received, a predetermined monitoring operation is started, and when the predetermined monitoring operation is completed, an end signal is transmitted to the control device,
The switching unit switches the transmission destination of the start signal when the control device receives the end signal.

According to this, the camera starts a predetermined monitoring operation in response to the start signal, and transmits an end signal when the predetermined monitoring operation is completed. Therefore, the transmission destination of the start signal is switched at an appropriate timing according to the predetermined monitoring operation of each camera.

Preferably, in the surveillance camera system, the camera includes a storage unit for storing an operation signal transmitted from the operation signal transmission unit, and the predetermined monitoring operation is a series of operations based on the stored operation signal. is there.

According to this, the operation signal transmitted from the operation signal transmission section is stored in the storage section of the camera. Therefore, thereafter, the camera can perform a series of operations according to the stored operation contents only by receiving the start signal. Therefore, it is not necessary to transmit the operation signal from the operation signal transmission unit one by one, and the signal line can be used for another signal transmission or the like.

[0021] Preferably, the surveillance camera system further comprises a difference data calculating unit for calculating difference data of video signals that are temporally preceding and succeeding, and a moving object detection unit for detecting a moving object based on the calculated difference data. And a switching unit that switches the transmission destination of the start signal based on the calculated difference data when the moving object is detected by the moving object detection unit.

According to this, it is possible to detect a moving object on the basis of difference data of video signals that are temporally different from each other. Further, since the transmission destination of the start signal is switched based on the difference data, the moving object can be monitored for a long time.

Preferably, the surveillance camera system further comprises a display unit for displaying an image based on image signals transmitted from a plurality of cameras, and a display unit when the moving object is detected by the moving object detection unit. And a trajectory display unit for displaying the trajectory of the moving object for a predetermined time.

According to this, the trajectory of the moving object is displayed on the display unit for a certain period of time, so that the monitoring person is encouraged to find an abnormality. Further, it becomes easy to find a moving object, and it is also possible to predict the moving direction of the moving object.

[0025]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram schematically illustrating an overall configuration of a surveillance camera system 1 according to an embodiment of the present invention. Referring to FIG. 1, surveillance camera system 1 includes C
Cameras 101 to 101 including an image sensor such as a CD, a microphone, and the like.
104 and a control device 10 for remotely controlling these cameras
5 and a monitor 107 for displaying video information sent from the cameras 101 to 104.

Each of the cameras 101 to 104 has a common signal line 1
The control device 105 remotely controls each of the cameras 101 to 104 via the common signal line 109. Here, different IDs are set for each of the cameras 101 to 104, and when the ID assigned to the control signal transmitted from the control device 105 matches the ID set for the camera, the corresponding ID is set. The camera starts the processing operation in response to the transmitted control signal.

As will be described later in detail, an audio signal, a control signal, and the like, in addition to a video signal, are frequency-multiplexed and transmitted on the common signal line 109.

FIG. 2 is a block diagram for explaining details of the internal configuration of the cameras 101 to 104 in FIG. FIG.
, Each of the cameras 101 to 104 mainly includes a video acquisition unit 20 that acquires and generates a video signal, an audio acquisition unit 21 that acquires an audio signal, an operation control unit 22 that controls operation of the camera, and a video signal Multiplexing section 211 for multiplexing the audio signal and the control signal by frequency modulation respectively.
It is composed of

The image acquisition unit 20 includes a CCD 203 for converting light from a subject into an electric signal (analog signal),
Lens 2 for imaging light from a subject on D203
01, a CDS / AGC circuit 205 for removing noise from the electric signal sent from the CCD 203 and keeping the gain constant, and converting an analog electric signal sent from the CDS / AGC circuit 205 into a digital signal. A / D
A converter 207 and a signal processing circuit 2 for performing signal generation processing of a color signal and a luminance signal from the digitally converted electric signal
09.

The audio acquisition unit 21 includes a microphone 213 for picking up surrounding audio, and an amplifier 21 for amplifying the audio signal obtained by the microphone 213 and transmitting the amplified audio signal to the signal multiplexing unit 211.
5 is included.

The operation control unit 22 includes a memory unit 223 for storing an operation signal transmitted from the control device 105,
A motor 217 for performing a pan operation, a motor 218 for performing a tilt operation, a motor 219 for performing a zoom operation, and a microcomputer 221 for controlling the motors 217 to 219 and the memory unit 223 are included. Contains.

The video signal input from the signal processing circuit 209, the audio signal input from the amplifier 215, and the control signal input from the microcomputer 221 are appropriately frequency-modulated in the signal multiplexing unit 211. And frequency multiplex transmission is performed via the signal line 225.

FIG. 3 is a diagram for explaining frequency multiplexing transmission in signal multiplexing section 211 of FIG. Here, the frequency is taken on the horizontal axis, and as shown in the figure,
The power supply 31 and the control signal 32, the audio signal 33, and the video signal 34, each modulated to a different frequency, are multiplexed and transmitted on the common signal line 109.

The signal to which the signal is frequency-modulated by the signal multiplexing unit 211 is sent to the signal multiplexing unit 211.
Control signal 3 input from microcomputer 221
2, an audio signal 33 input from the amplifier 215, and a video signal 34 input from the signal processing circuit 209.

The power supply 31 is usually a DC power supply of 12 V, and is always supplied from the control device 105 to each of the cameras 101 to 104. Control device 105 and cameras 101 to 1
The control signal 32 transmitted and received between the transmitters 04 is FM-modulated on a carrier of several kHz, and is transmitted as a packet only when transmission and reception are necessary. Each camera 101-1
The audio signal 33 transmitted from the audio acquisition unit 21 of 04 to the control device 105 is modulated to about several hundred kHz.
Further, the video signal 34 transmitted from the video acquisition unit 20 of each of the cameras 101 to 104 to the control device 105 is approximately several tens of M
Hz.

As described above, the frequency of each signal is appropriately modulated, and the signals are multiplexed on the common signal line 109.
Note that the audio signal 33 and the video signal 34 are not transmitted simultaneously from the plurality of cameras 101 to 104, but are transmitted in a time-division manner and sequentially. Therefore, the audio signal 33 and the video signal 34 are always transmitted from any one of the cameras.

As described above, the signals (31 to 34) are frequency-multiplexed, and the audio signal 33 and the video signal 34 from each camera are time-division multiplexed and transmitted.
A signal line is not required for each camera, and a common signal line 109 is used.
It is possible to perform signal transmission and reception only by using this.

FIG. 4 is a diagram showing an example of the arrangement of switches and the like on the operation panel of the control device 105. Referring to FIG. 4, a pan operation (horizontal movement) of each of cameras 101 to 104 is provided on the operation panel.
, A tilt knob 405 for setting the tilt operation (vertical movement) condition, an operation speed knob 401 for setting the speed of the pan operation and the tilt operation, and a zoom operation (magnification ratio). A zoom knob 403 is provided.

By adjusting these knobs (hereinafter collectively referred to as “operation knobs”), each camera 101
To 104 can perform a desired monitoring operation.
That is, from the control device 105, an operation signal corresponding to the adjustment of the operation knob is transmitted to each of the cameras 101 to 104.

The operation panel has a start button 409 for starting the monitoring operation of each camera 101, an end button 411 for ending the monitoring operation, and a control signal for performing a predetermined series of monitoring operations. Is provided in the memory unit 223 of each camera, and an ID setting switch 415 for selecting a specific camera.

An outline of a method of operating the cameras 101 to 104 using these buttons, switches, and operation knobs will be described below.

First, an operation is performed to allow each camera to learn an appropriate monitoring operation according to its installation position and surrounding conditions. That is, the target surveillance camera is designated by pressing the ID setting switch 415. Then, by pressing the memory button 413 and adjusting the operation knob, an operation of storing the appropriate monitoring operation in the designated camera is performed.

As described above, when an appropriate monitoring operation (operation signal) is stored in the memory unit 223 for each camera, the next time the start button 409 is pressed, the operation of each camera can be performed. Can be. That is, since the order in which the cameras are operated is set in advance, when the start button 409 is pressed, the corresponding camera automatically performs predetermined pan, tilt, and stop according to the operation signal stored in the memory unit 223. , Zooming and the like. Therefore, once the operation is stored in the camera, it is not necessary to adjust the operation knob or the like, and the operation becomes very easy.

An ID setting switch 41 is provided for each camera.
By setting the mode that can be operated with 5,
The various monitoring operations may be stored as separate modes. In this case, when a specific mode is designated from among them, a necessary monitoring operation can be called. Therefore, only by specifying the mode, the desired operation can be performed by the camera, and the operability can be further improved.

As described above, even when the predetermined monitoring operation is not stored, or when the predetermined monitoring operation is stored,
By operating the operation knob, the operation of each camera can be operated in real time.

Next, the flow of the monitoring operation of the monitoring camera system 1 will be described with reference to FIGS.

FIG. 5 is a flowchart showing the main flow of the monitoring operation of the monitoring camera system 1. Referring to FIG. 5, surveillance camera system 1 starts a surveillance operation when start button 409 on the operation panel is pressed.

That is, when the monitor button 409 is pressed, a start signal is transmitted from the control device 105. Since the transmission destination for transmitting the start signal is set in advance in the control device 105, the control signal is transmitted to the control device 105 together with the start signal.
D information is transmitted to each camera. And the transmitted I
The camera having the ID set to match the D information receives this start signal.

When the camera receives the start signal, it proceeds to step S
At 501, a series of monitoring operations are performed. That is,
Here, the pan, tilt,
A monitoring operation around the camera is appropriately performed based on the stop and zoom operation signals.

Therefore, even when the camera itself is fixed, a wide area can be monitored by performing the pan / tilt operation. Also, by performing the zoom operation, necessary parts in a wide area can be
It is possible to monitor in detail.

Image information captured while performing such a series of operations is constantly transmitted from the camera to the control device 105 via the common signal line 109 as a video signal.
At this time, the audio signal picked up by the microphone 213 is transmitted together with the video signal.

Then, the camera continues the monitoring operation until this series of stored monitoring operations is completed, and when it is completed, the camera transmits an end signal to the control device 105 (steps S503 and S505).

When the monitoring operation is not stored in the memory unit 223 of the camera, the pan, tilt, stop, and zoom operation signals in the state where the operation knob of the operation panel is set are transmitted from the control device 105 to the camera. The camera which receives the start signal and performs the monitoring based on the operation signal. Then, depending on whether the ID setting of the next camera is performed by the ID setting switch 415 or the predetermined time has elapsed, the monitoring operation of the camera is completed, and an end signal is transmitted in step S505.

In step S507, control device 105, having received the end signal, transmits a start signal to the next camera in a preset order. That is, the ID information of the next camera is added to each camera 101 together with the start signal.
To 104.

Then, in step S501, the camera for which the corresponding ID is set starts monitoring.

In this manner, unless a moving object is found, the control device 105 transmits and receives control signals according to these processes until the end button 411 of the operation panel is pressed, and the like. 104 repeats these processes in order.

FIG. 6 shows the monitoring camera system 1
It is the flowchart which showed the flow of the process when a moving object is detected. This moving object detection processing is performed at regular intervals as an interruption processing of the monitoring operation (step S501) in FIG. That is, while the monitoring operation of FIG. 5 (step S501) is being performed, the detection of the moving object is always performed.

Referring to FIG. 6, when a predetermined time elapses during the monitoring operation of FIG. 5, it is determined in step S601 whether a moving object has been detected. The presence or absence of the moving object is determined based on the result of the difference data calculation processing performed in each camera.

That is, each camera calculates difference data between the current video data and the video data a predetermined time ago. The image obtained from the camera moves due to a pan / tilt operation or the like, and among them, if there is difference data significantly larger than others, it is determined that a moving object exists.

The calculation of the difference data of the video signal and the detection of the moving object may be performed by software or the like built in each camera, or may be performed by the control device 105.

If it is determined in step S601 that a moving object exists, then in step S603,
An alarm signal is transmitted to the control device 105 simultaneously with the video signal. That is, the camera that is currently operating upon receiving a start signal from the control device 105 performs video and audio signals while performing pan and tilt operations and the like.
Is sending to. Then, when it is determined from the result of the difference data calculation processing that a moving object exists, an alarm signal is transmitted from the camera. This alarm signal is transmitted to the control device 105 via the common signal line 109 together with the video signal and the audio signal.

As long as the alarm signal is transmitted from the camera, the monitoring operation is performed by the camera capturing the image of the moving object. That is, step S60
In 5, it is determined whether or not the transmission of the alarm signal has been completed. Only when it is determined that the transmission has been completed, the process proceeds to the next step S607. When it is determined that the processing has not been completed, the monitoring operation is continued as it is, and the alarm signal is continuously transmitted to the control device 105 together with the video data and the audio data. At this time, the control device 1
An alarm may be sounded on the 05 side.

If it is determined in step S605 that the transmission of the alarm signal has been completed, that is, if the presence of a moving object is not confirmed by the operating camera, in step S607, the next camera is determined based on the movement data. Is selected. The moving data of the moving object is obtained from the difference data that is the basis of the detection of the moving object, and the next camera that is closest to the moving object and that can capture the image of the moving object is selected based on the moving data. .

Then, in step S609, a start signal to which the ID information of the selected camera is added is transmitted from the control device 105. Then, step S5 in FIG.
Returning to the process of 01, the camera of the corresponding ID receiving the start signal starts the monitoring operation.

This monitoring operation (step S501 in FIG. 5)
Also, in the case where the presence of the moving object can be confirmed, "Yes" is determined in step S601 of the interrupt routine for detecting the moving object, and the subsequent detection interrupt processing is performed. That is, the transmitted alarm signal is transmitted to the control device 105 together with the video signal and the audio signal (step S603). When the transmission of the alarm signal ends, the next camera is selected (steps S605 and S607), and the selected camera is selected. A start signal is transmitted to the camera that has started (step S609).

On the other hand, if the moving object stops moving or the moving object moves out of the monitoring range and cannot be captured as a camera image, the moving object is not detected. . Therefore, in this case, it is determined to be “No” in step S601 of the interrupt routine for detecting a moving object, so that the normal monitoring operation (FIG.
Step S501) is continued.

As described above, when there is no moving object,
When the normal monitoring operation in FIG. 5 is performed and a moving object is present, an interrupt processing routine for detecting a moving object in FIG. 6 is performed.

Therefore, in general, monitoring can be performed in a wide range and in detail by panning, tilting, zooming, and the like, and once a moving object is found, cameras capable of capturing the image of the moving object are sequentially operated. Time moving objects can be projected.

At this time, since not only the video signal but also the audio signal is transmitted, the observer can grasp the situation of the site in a more detailed and realistic manner. Therefore,
Unlike conventional surveillance camera systems that only monitor images from fixed locations that are time-shared,
You can know the details of the site in detail.

FIG. 7 is a view showing the suspicious person 701 displayed on the monitor 107. Referring to FIG. 7, suspicious person 7
01 is confirmed as a moving object by difference data calculation and moving object detection. In this case, the suspicious person 70
A trajectory 703 indicating the direction in which 1 (moving object) moves is displayed on the monitor 107.

The trajectory 703 of the suspicious person 701 is monitored by the monitor 107.
As a method of displaying on the top, a method by superimposition or the like is used. When a moving object is found, the image is simplified by obtaining the center of gravity of the image, and the position is stored. Then, the locus is displayed by sequentially superimposing and displaying the next video.

As described above, when the trajectory 703 of the suspicious person 701 is displayed on the monitor 107 for a certain period of time, the observer immediately notices the abnormal state and can easily find the suspicious person 701. In addition, since the behavior of the suspicious individual can be understood and predicted, it is possible to take appropriate measures thereafter.

As described above, the surveillance camera system 1 according to the present embodiment uses one signal line, so that the amount of wiring does not increase even when the number of surveillance cameras is large. Therefore, construction becomes very easy, which leads to cost reduction. In addition, even when a surveillance camera is added later, a common signal line may be used, so that additional construction is very simple.

Further, since time-division transmission is performed on this one signal line, unlike a case where video signals from a plurality of cameras are frequency-multiplexed and transmitted, a modulation process performed on a video (or audio) signal is performed. May be the same, and all cameras having the same configuration can be used. Therefore, a significant cost reduction is possible from this point as well.

In addition to the above effects, the following effects can be obtained. That is, the video captured by the surveillance camera is not a fixed video as in the related art, but is an appropriate video according to the installed situation by operations such as pan, tilt, and zoom. Therefore, the observer can obtain more extensive and detailed information from one monitor and a limited number of cameras. Further, since not only the video information but also the audio information is reproduced, it is possible to more clearly grasp the state of the site.

Further, since the operation of each camera can be remotely controlled in real time in the control device 105, the operability is very good. By storing the monitoring operation once, the operation from the next time becomes unnecessary, and the operability is further improved. In particular, the monitoring operation is performed by the memory unit 22 in each camera.
By storing the data in 3, the operation signal from the control device 105 becomes unnecessary thereafter, and the control line can be used for various other purposes.

When one camera performs a monitoring operation in response to a start signal from the control device 105, the other cameras can also perform a pan / tilt operation or the like. Although only one camera that has received the start signal actually transmits the video signal and the audio signal, etc., by letting other cameras perform pan / tilt operations, etc. This makes it seem that all the cameras are performing the surveillance operation.

In the present embodiment, as described with reference to FIG. 6, the detection interruption of the moving object is performed at regular intervals in the monitoring operation (step S501) of FIG. However, the present invention is not limited to this method. For example, the determination of the presence or absence of movement may be performed in parallel with the monitoring operation. Then, only when it is determined that a moving object is present, an interrupt process can be performed.

That is, with reference to FIG. 6, step S601 is always performed in parallel with step S501 (monitoring operation) in FIG. 5, and when it is determined that a moving object exists, that is, step S601 At "Y
Only in the case of "es", the processing of step S603 and subsequent steps may be performed as an interrupt routine in the processing of FIG.

Further, in the embodiment shown this time, as described with reference to FIG. 6, a method of using the calculation result of the difference data is employed as a method of detecting a moving object. The present invention is not limited to this method. For example, a sensor such as an infrared sensor may be provided for each camera, and a moving object may be detected based on the detection result.

Here, the desired monitoring operation (operation signal) for each camera is stored in the memory unit 223 provided in each camera. However, the control unit 105 is provided with a memory unit. You may make it memorize | store in a memory part. This eliminates the need for a memory in the camera, and makes the camera more compact.

Although the number of cameras is four in the configuration shown in FIG. 1 and the like this time, the present invention is not limited to this configuration, and any number of cameras may be used.

The embodiment disclosed this time is merely an example in all respects, and should not be construed as limiting. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[Brief description of the drawings]

FIG. 1 is a diagram schematically illustrating an overall configuration of a monitoring camera system 1 according to an embodiment of the present invention.

FIG. 2 is a block diagram for explaining details of an internal configuration of cameras 101 to 104 in FIG. 1;

FIG. 3 is a diagram for explaining frequency multiplex transmission in a signal multiplexing unit 211 of FIG. 2;

FIG. 4 is a diagram showing an example of the arrangement of switches and the like on an operation panel of the control device 105.

FIG. 5 is a flowchart showing a main flow of the monitoring operation of the monitoring camera system 1;

FIG. 6 is a flowchart showing a flow of processing when a moving object is detected in the monitoring camera system 1.

FIG. 7 shows a suspicious person 701 displayed on a monitor 107.
FIG.

FIG. 8 is a configuration diagram schematically illustrating a surveillance camera system according to the related art using a plurality of signal lines.

FIG. 9 is a configuration diagram schematically illustrating a surveillance camera system when one control device and one monitor are used for a plurality of cameras.

[Explanation of symbols]

Reference Signs List 20 video acquisition unit, 21 audio acquisition unit, 22 operation control unit, 101, 102, 103, 104 camera, 105
Control device, 107 monitor, 109 common signal line, 2
03 CCD, 209 signal processing circuit, 213 microphone, 215 amplifier, 217, 218, 219 motor, 221 microcomputer, 223 memory section,
211 signal multiplexing unit, 401 operating speed knob, 40
3 Zoom knob, 405 tilt knob, 407 pants knob, 413 memory button, 415 ID setting switch.

 ──────────────────────────────────────────────────続 き Continued from the front page F term (reference) 5C022 AA01 AB00 AB61 AB62 AB65 AB66 AB68 AC69 AC71 AC72 5C054 CF06 CG05 CH08 DA01 EG04 EG08 FC01 FC13 FE13 GB01 HA18 5C084 AA02 AA07 AA08 AA13 BB25 CC16 CC19 DD11 DD42FF57 FFFF GG01 GG17 GG20 GG24 GG39 GG40 GG42 GG52 GG56 GG57 GG68 GG74 GG78 HH01 HH10 HH13 5C087 AA03 AA09 AA19 AA32.

Claims (6)

[Claims] 1. A camera comprising: a plurality of cameras connected to a common signal line in a bus shape; and a control device for controlling the plurality of cameras via the signal lines. A video signal obtained from the plurality of cameras is A surveillance camera system, which is time-divisionally transmitted on the signal line, wherein the control device transmits an operation signal for causing the camera to perform an operation such as pan, tilt, stop, zoom, and the like. A surveillance camera system, comprising: an operation unit that operates based on the transmitted operation signal. 2. The camera includes an audio acquisition unit for acquiring audio, and an audio signal acquired from the audio acquisition unit is transmitted along with the corresponding video signal in a time-division manner on the signal line. The surveillance camera system according to claim 1. 3. The control device further includes a start signal transmitting unit that transmits a start signal to the camera, and a switching unit that switches a transmission destination of the start signal, wherein the camera transmits the start signal from the control device. When a predetermined monitoring operation is started, and when the predetermined monitoring operation is completed, an end signal is transmitted to the control device, and the switching unit receives the end signal from the control device. The surveillance camera system according to claim 1, wherein a destination of the start signal is switched in such a case. 4. The camera according to claim 3, further comprising: a storage unit configured to store an operation signal transmitted from the operation signal transmission unit, wherein the predetermined monitoring operation is a series of operations based on the stored operation signal. A surveillance camera system according to item 1. 5. The image processing apparatus further comprising: difference data calculation means for calculating difference data of the video signal that is temporally delayed, and moving object detection means for detecting a moving object based on the calculated difference data. 5. The surveillance camera system according to claim 3, wherein, when a moving object is detected by the moving object detection unit, the switching unit switches the transmission destination of the start signal based on the calculated difference data. 6. A display means for displaying an image based on image signals transmitted from the plurality of cameras, and a trajectory of the moving object on the display means when the moving object is detected by the moving object detecting means. 6. The surveillance camera system according to claim 5, further comprising: a trajectory display unit that displays a predetermined time.