JPH11331819A - Camera monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To send a required amount of control information to a camera through a path of a video signal. SOLUTION: The camera monitoring system is provided with a camera that photographs an object and a camera controller that controls the camera. The camera is provided with an AM modulator 36 that applies AM modulation to control information, an adder 33 that applies frequency multiplexing to an output of the modulator 36 and a video signal obtained by the photographing, and a transmission reception separation section 32 that separates the control information from a signal received via a coaxial cable 31 from the camera controller. On the other hand, the camera controller is provided with a transmission reception separation section 42 that separates the frequency-multiplexed signal coming from the camera into the video signal and the control information and an AM modulator 48 that applies AM modulation to the control information received by the camera controller and sends the modulated information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera monitoring system used for industrial monitoring and security monitoring.

[0002]

2. Description of the Related Art As shown in FIG. 15, a conventional camera surveillance system includes camera devices 101-1 through 101-1 for imaging a subject.
Camera operating device 100 for performing control for each 101-n
-1 to 100-n are provided correspondingly. Each of the camera devices 101-1 to 101-n is provided with consoles 102-1 to 102-n for an operator to input instructions and monitors 103-1 to 103-n for displaying images. ing.

For this reason, there is a problem that the number of camera operating devices increases as the number of camera devices is increased. Also, since each camera operating device is independent, it was not possible to control a camera device other than those connected to the camera operating device.

When transmitting control information from a camera device to a camera operating device, as shown in FIG. 16, control information is multiplexed and transmitted in a V blanking period 160 of a retrace period 150 of a vertical synchronization signal. doing.

[0005]

However, in such a method, the V blanking period 160 takes about 60 m.
s, which limits the amount of information that can be transmitted at one time. In addition, since the retrace period 150 of the vertical synchronization signal occurs at intervals, it is necessary to store information to be transmitted and transmit an amount that can be multiplexed when the retrace period 150 described above arrives. Memory is required for this purpose, and the processing is cumbersome.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional camera monitoring system, and has an object to control a plurality of camera devices by one camera operating device. It is to provide a simple camera monitoring system. Another object of the present invention is to provide a camera surveillance system that can send a necessary and sufficient amount of control information at a time without having to send control information separately.

[0007]

According to a first aspect of the present invention, there is provided a camera surveillance system comprising a camera device for capturing an image of a subject, and a camera operating device for controlling the camera device. The camera device is provided with a bidirectional multiplexing unit that frequency-multiplexes a video signal obtained by imaging and control information and separates control information from a signal arriving from the camera operation unit, while the camera operation unit includes A video separation control transmitting unit that separates a frequency-multiplexed signal coming from the camera device into a video signal and control information, and sends control information to the camera device side. . Thus, the video signal and the control information signal are transmitted by frequency multiplexing.

In the camera surveillance system according to the second aspect, the bidirectional multiplexing unit and the video demultiplexing control transmitting unit are each multiplexed with an AM modulator that modulates a control information signal before multiplexing. And an AM demodulator that separates control information from an incoming signal and then performs AM demodulation. Thereby, the control information is transmitted and received after being AM-modulated, and appropriate transmission is guaranteed.

In the camera surveillance system according to the third aspect, the AM modulator converts the control information signal from 10 MHz to 1 MHz.
It is characterized by performing AM modulation with a 2.5 MHz carrier. This avoids the frequency band of the video signal,
In addition, AM modulation is performed using a carrier having an appropriate frequency while avoiding a frequency band where attenuation is large.

[0010] In the camera surveillance system according to the fourth aspect, the camera device is provided with means for acquiring sound.
The video signal is a signal obtained by modulating the audio signal obtained by the means, and the AM modulator converts the control information signal into one.
It is characterized by performing AM modulation with a carrier of 1 MHz to 12.7 MHz. As a result, AM modulation is performed using a carrier having an appropriate frequency while avoiding a frequency band of a video signal in which an audio signal is modulated and avoiding a frequency band where attenuation is large.

[0011] The camera monitoring system according to claim 5 is
The AM modulator performs AM modulation using a 0 MHz carrier when there is no control information signal to be transmitted. As a result, when there is no control information signal to be transmitted, the modulation operation is not substantially performed.

[0012] The camera monitoring system according to claim 6 is
In a camera monitoring system including a camera device for capturing an image of a subject and a camera operating device for controlling the camera device, the camera device has a frequency-multiplexed video signal obtained by imaging and control information, and A bidirectional multiplexing unit for separating control information from a signal arriving from the camera operating unit is provided, while the camera operating unit separates a frequency-multiplexed signal arriving from the camera device into a video signal and control information. A video separation control transmission unit for transmitting control information to the camera operating device side; control information separated by the video separation control transmission unit; and control information before transmission to the video separation control transmission unit. And a communication processing unit for transmitting and receiving control information via the bus. Thus, the control information signal transmitted to the bus is multiplexed and transmitted to the camera device, so that the control information can be transmitted and received as if the camera operating device and the camera device were connected to the bus.

[0013] In the camera monitoring system according to the present invention, the camera device includes a plurality of control objects including a control object to be subjected to exclusive control, and control information relating to a control object whose incoming control information is to be subjected to exclusive control. It is characterized by comprising a detecting means for detecting whether or not the control is performed, and a control executing means for performing exclusive control when the detecting means detects control information on a control target to be subjected to exclusive control. As a result, exclusive control is performed when instructions are issued from a plurality of camera operating devices.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A camera monitoring system according to an embodiment of the present invention will be described below with reference to the drawings. In the respective drawings, the same components are denoted by the same reference numerals, and redundant description will be omitted. FIG. 1 shows a schematic configuration of the camera monitoring system. In this system, camera operating units 1-1 to 1--1
camera device 2-11 that captures an image of a subject in each of n
2-14, 2-21 to 2-24, ..., 2-n1
2-n4 is connected, the consoles 3-1 to 3-n and the monitor 4
-1 to 4-n are connected.

The camera operating units 1-1 to 1-n are connected to a bus 5
(5-1 to 5-n), and the bus 5 is connected to the camera devices 2-11 to 11 through control units 10-1 to 10-n of the camera operation units 1-1 to 1-n and signal lines. 2-14, 2-
.., 2-n1 to 2-n4 control units 20-11 to 20-14, 20-21 to 20-24,.
.., 20-n1 to 20-n4 are connected. Camera devices 2-11 to 2-14, 2-21 to 2-24, ...
-Control units 20-11 to 20-1 of 2-n1 to 2-n4
4, 20-21 to 20-24, ..., 20-n1-2
Control information sent from 0-n4 is stored in buffers 6-11 to 6-11.
6-14, 6-21 to 6-24, ..., 6-n1 to 6
-N4 leads to bus 5. Camera operating devices 1-1 to 1-
The control information sent from the n control units 10-1 to 10-n is transmitted to the camera devices 2-11 to 2-14, 2-
.., 2-n1 to 2-n4 control units 20-11 to 20-14, 20-21 to 20-24,.
.., 20-n1 to 20-n4.

FIG. 2 shows a camera operating device 1 (1-1 to 1--1).
The detailed configuration of n) is shown. Video separation control transmission units 12-1 to 12-4 are connected to the camera device. Buffers 14-1 and 14-2 for receiving video signals from adjacent camera operating devices are provided.
The outputs of 4-1 and 14-2 are sent to the selector 11. The selector 11 is provided with the video signals separated by the video separation control transmission units 12-1 to 12-4. Note that the number 4 of camera devices that can be connected is merely an example.

The camera operating device 1 shown in FIG. 2 is provided with a CPU 21 for controlling the operating device. The CPU 21 has a numeric keypad 27 for inputting data, information and instructions through an I / O port 25, and a panel. Switch (SW) 28,
A display unit 29 for displaying a status and an alarm, and an external operation interface (IF) 30 for providing operation keys and the like outside are connected. The CPU 21 has a bidirectional RAM.
The communication processing unit 23 is connected to the communication processing unit 23 via the communication processing unit 22. The communication processing unit 23 is connected to the AM modulation / demodulation units 13-1 to 13-4 via the bus 5 (corresponding to 5-1 to 5-n in FIG. 1). An interface (I / F) 26 is connected to the bus 5.
Is connected to the bus of the adjacent camera operating device via the interface (equivalent to 26) of the adjacent camera operating device.

The video separation control section 12 (12-1 to 12-4), the AM modulation / demodulation section 13 (13-1 to 13-4) and the camera apparatus 2 (2--1) in the camera operating device 1 configured as described above. 11-2-14, 2-21 to 2-24, ...
, 2-n1 to 2-n4) are shown in FIG. The right side in FIG. 3 is the video separation control unit 12.
(12-1 to 12-4) and the AM modulator / demodulator 13 (13-1)
13-4), and the left side is a corresponding portion inside the camera device 2. A coaxial cable 31 (for example, 7C-2V) is used as a transmission path between the camera device and the camera operation device. The transmission / reception separation units 32 and 42 are connected to the coaxial cable 31.

The transmission / reception separation units 32 and 42 are configured, for example, as shown in FIG. That is, the coaxial cable 31
, Via the amplifier 52. A resistor 5 is provided between the output terminal of the amplifier 52 and the coaxial cable 31.
1 is connected, and a potential difference between both ends of the resistor 51 is detected by a differential amplifier 53 using an operational amplifier. The inverting input terminal (-) of the operational amplifier is connected to the output terminal side of the amplifier 52, and the non-inverting input terminal (+) is connected to the coaxial cable 31 side.
The differential amplifier 52 has a non-inverting input terminal (+)
The potential of the inverting input terminal (-) is subtracted from the potential of
An output is generated only when this value is positive. For this reason, depending on the signal sent from the amplifier 52, a potential difference occurs between both ends of the resistor 51, and the potential of the inverting input terminal (−) becomes higher than the potential of the non-inverting input terminal (+). No output is available. On the other hand, for a signal 54 indicated by a broken line arriving from the opposite side via the coaxial cable 31, the resistor 51
, The potential of the non-inverting input terminal (+) increases, and the potential of the inverting input terminal (-) increases.
Only the signal arriving from the opposite side via
2 can be obtained.

Referring to FIG. 3 again, the camera apparatus is provided with a low-pass filter 34 having a frequency characteristic shown in 8 of FIG. 6 for removing high-frequency components of a video signal such as NTSC obtained by a television camera. Can be Also,
The control information signal (for example, 312.5 KHz shown in FIG.
Thus, for example, a carrier of 11 MHz (FIG. 7A)
The signal is AM-modulated to generate a modulated signal (FIG. 7 (c)), and a predetermined frequency band is passed by the band-pass filter 35 having the frequency characteristic indicated by 9 in FIG. The video signal that has passed through the low-pass filter 34 and the control information signal that has passed through the band-pass filter 35 are added and frequency-multiplexed by the adder 33, and the transmission / reception separation unit 32 described above is added.
Through the coaxial cable 31.

The multiplexed signal reaches the transmission / reception separation unit 42 on the camera controller via the coaxial cable 31.
The signal is amplified by a required gain by a cable compensating circuit 42 composed of an amplifier or the like, and the low-pass filter 44
And a band-pass filter 45. A video signal is extracted by passing the multiplexed signal through a low-pass filter 44 having a frequency characteristic shown in FIG.
The band-pass filter 4 having the frequency characteristic indicated by 9 in FIG.
5, a signal in which the control information is AM-modulated is extracted. The AM-modulated signal is demodulated by the AM demodulator 46 to be sent to the bus 5 as control information.

On the other hand, the CPU 21 shown in FIG.
The signal of the control information written in 22, transmitted by the communication processing unit 23, and transmitted via the bus 5 is modulated by the AM modulator 48 and passed through the band-pass filter 47 having the frequency characteristic indicated by 9 in FIG. A predetermined frequency band is passed through the coaxial cable 31 via the transmission / reception separation unit 42.
Sent to This signal is received by the transmission / reception separation unit 32 via the coaxial cable 31, separated, amplified by a required gain by a cable compensation circuit 37 composed of an amplifier or the like, and subjected to a band having a frequency characteristic indicated by 9 in FIG. The signal is supplied to the pass filter 38 and converted into an AM-modulated signal. The AM-modulated signal is demodulated by the AM demodulator 39 and transmitted as control information.

The attenuation characteristic of "7C-2V" adopted here as the coaxial cable 31 is as shown in FIG.
That is, the attenuation is about 25 dB from the characteristics of the current circuit.
Smaller than the band-pass filter 35,
From the frequency bands of 38, 45, and 47, about 22 dB is the center value. The frequency corresponding to this 22 dB is 11 MH
In the above description, the carrier frequency of AM modulation is set to 11 MHz. If 25 dB of attenuation is allowed, the carrier frequency can be increased to 12.7 MHz. Further increase the carrier frequency and increase the bandpass filter 3
If the frequency characteristic such as 5 is as shown by 9A in FIG. 6, the reception level is significantly attenuated as shown by the broken line in FIG. Further, when the carrier frequency is lowered, the frequency band overlaps with the frequency band of the video signal (8 in FIG. 6), so the upper limit is 10 MHz. The camera device is provided with a unit (microphone) for acquiring audio, and when the video signal output from the camera device is a signal obtained by modulating an audio signal to a video signal related to only video, the output is performed. In order not to overlap the frequency band of the video signal, the limit is 11 MHz. When there is no control information signal to be transmitted, the A
Perform M modulation. As a result, unnecessary modulation is not performed, power consumption is reduced, and the risk of noise due to modulation when there is no control information signal to be transmitted can be eliminated. The upper limit of the carrier frequency can be changed by improving the noise and signal discrimination ability of the circuit.

The camera device 2 is configured, for example, as shown in FIG. In other words, a bidirectional multiplexing unit 66 composed of various units shown on the left side of the coaxial cable 31 in FIG. 3, a camera unit 67 for capturing an image of a subject, obtaining a video signal, and sending it to the bidirectional multiplexing unit 66, A communication processing unit 68 for performing communication with the communication processing unit 23 according to a predetermined protocol, a bidirectional RAM 69, and a CPU 6 for integrally controlling the camera device 2
1 is provided. The CPU 61 has an I / O port 6
2, motors 63 to 65 are provided. The motor 63 is, for example, a motor for performing zooming, the motor 64 is, for example, a motor for horizontally rotating the camera unit 67, and the motor 65 is, for example, a motor for vertically rotating the camera unit 67.

The communication processing unit 23 of FIG. 2 and the communication processing unit 68 of FIG. 5 communicate control information via the bus 5 according to the following protocol. The control information includes one or a plurality of destinations (including a broadcast) and information of one transmission source. The communication processing unit that has received the transmission fetches the destination information if it belongs to the own device, and If it does not match the destination information, it is discarded. If a transmission has been received, a response is returned.
If there is no response, it is determined that a collision has occurred in the transmitted information, and transmission is performed again after a time determined using a random number or the like. The camera devices 2-1 to 2-n return a response when receiving the driving instruction.
It is possible to know the control states of the camera devices 2-1 to 2-n.

When an instruction is given from the CPU 21 of the camera operating unit 1-1 by the system configured as described above, the instruction is sent out to the bus 5 (5-1 to 5-n), and the camera device 2-11 to 2-n is sent. 14, 2-21 to 2-24,..., 2
Since the CPU 61 of -n1 to -n4 receives the instruction, an instruction can be given to any camera device. When an instruction is given from the CPU 21 of a plurality of camera operating devices, the CPU 61 of the instructed camera device performs processing based on the instruction. For example, horizontal turning, vertical turning, and zoom are instructed from another camera operating device. Accordingly, it is possible to cause the camera unit 67 of the camera device to perform the corresponding combined motion.

FIG. 9 shows a configuration in which a video transformer 49 is provided at the center of the coaxial cable 31 instead of the coaxial cable 31 in FIG. The video transformer 49 originally guarantees signal transmission in the video band, and allows the passage of control information signals by the above 11 MHz carrier. According to this configuration example, isolation between the camera device side and the camera operation device side can be obtained.

FIG. 10 shows another example of the configuration on the camera operating device side with respect to the coaxial cable 31 in FIGS. In this configuration example, the amplitude modulation circuit 75 has the configuration shown in FIGS.
, The amplifier 71 corresponds to the cable compensation circuit 43 in FIGS. 3 and 9, and the video band filter 73 corresponds to the low-pass filter 44 in FIGS. 3 and 9. . The band pass filter 72 corresponds to the band pass filter 45 and the AM demodulator 46 in FIGS.
In this configuration example, the transmission / reception separation unit 42 in FIGS. 3 and 9 is omitted. In this configuration example, a terminating resistor 76 is connected between the amplitude modulation circuit 75 and the coaxial cable 31 so that the impedance of the circuit as viewed from the transmission path side looks like 75 ohms, thereby achieving impedance matching.
The signal passed through the image band filter 73 is amplified by the attenuation correction circuit 74 and output.

FIG. 11 shows another example of the configuration on the camera device side with respect to the coaxial cable 31 in FIGS. In this configuration example, the amplifier 55 includes the low-pass filter 34 shown in FIGS. The amplitude modulation circuit 56
Is a configuration including the band-pass filter 35 and the AM modulator 36 in FIGS. 3 and 9, the amplifier 58 corresponds to the cable compensation circuit 37 in FIGS. 3 and 9, and the band-pass filter 59 is the structure in FIGS. Band filter 38 and A
This corresponds to the M demodulator 39. In this configuration example, FIGS.
Is omitted in the transmission / reception separating unit 32 in FIG. Amplifier 5
5. A terminating resistor group 57 in which resistors R1 to R3 are connected in a T-shape is connected between the amplitude modulation circuit 56 and the coaxial cable 31 so that the impedance of the circuit viewed from the transmission line side looks like 75 ohms. Impedance matching is achieved.

10 and 11, the video signal and the control information signal are multiplexed between the camera operating device and the camera device, and the terminating resistor 76 and the terminating resistor group are multiplexed. Transmission and reception are performed while impedance matching is achieved by 57.

FIG. 12 shows another configuration of the camera device. This camera device is provided with a turning unit 88 for turning the camera unit 87 and a light 89 for illuminating a subject for illumination, in addition to the camera unit 87 which is a part for obtaining a video signal by imaging. The drive of the camera section 87, the turning device 88, and the light 89 is controlled by a drive control section 86. The communication control unit 81 is connected to the bus 5 and receives control information related to an instruction from the CPU 21 of the control unit 10 of the camera operating device. The communication control unit 81 includes the configuration shown in FIGS. 3, 9, and 11, but is omitted here.

Actually, the video signal obtained by the camera unit 87 and the control information signal such as the response to the camera operating device are multiplexed and transmitted. However, here, only the path of the control information is shown. Control information such as a response to the camera operating device is output from the transmission unit 82. The control information from the camera operating device is taken into the receiving unit 83. The control information is decoded by the decoder 84 when necessary, and is used by the exclusive processing unit 85 for controlling the exclusive processing. The decoder 84 and the exclusion processing unit 85 are configured by, for example, the CPU 61 shown in FIG. 5, and perform processing based on the program in the flowchart shown in FIG.

That is, when control information is received, it is detected whether the control information is control information relating to a control instruction for the camera section 87, the turning device 88, and the light 89 to be controlled (S1).
Here, the camera unit 87, the turning device 88,
If the control information is not the control information relating to the control instruction for the light 89, the control information is passed through the processing of the flowchart in FIG. 13 and a response is returned.

On the other hand, if the control information is control information relating to a control instruction for the camera section 87, the turning device 88, and the light 89 to be controlled, decoding is performed to determine whether an exclusion process is necessary (S2). . If exclusive processing is necessary, exclusive processing is executed (S3). For example, it is assumed that the turning device 88 is a target of the exclusive processing. And a certain one
If control information of a predetermined degree of horizontal left turning is received from one camera operating device and control information of a predetermined degree of horizontal left turning is transmitted from another camera operating device while performing this processing, exclusive control is performed. Through the processing, the control information indicating the rejection of acceptance is sent as the response control information without performing the horizontal turning to the left by a predetermined degree.

If exclusive processing is not required as a result of the detection in step S2, processing based on the instruction is performed (S4). For example, when control information of a predetermined degree of horizontal right turn is received from a certain camera operating device, and a lighting command of the light 89 comes from another camera operating device while performing this process, The light 89 is turned on. Note that, besides the processing as in the present embodiment, for example, the drive control unit 8 receives control information from a certain camera operating device and receives control information.
6, an exclusive process may be performed when control by the drive control unit 86 must be performed upon receiving control information from another camera operating device.

In FIG. 14, the wiper 90 (90-11, 90-12, 90-2) is added to the configuration of FIG.
Camera device 2-11, 2-12, 2-21 provided with 1)
1 shows a camera surveillance system using. Also in this example, the control units 20-11 and 2-11 perform exclusive control.
The communication processing unit 8 shown in FIG.
1. A drive control unit 86 is provided. Bus 5 (5-1, 5-
2), the control units 10-1 and 10-2 are connected, and any one of the camera devices 2-11, 2-12, and 2-21 is controlled by the control units of the two camera operation units 1-1 and 1-2. Can also be controlled. In this case, exclusive control is performed as described above.

[0037]

As described above, according to the camera monitoring system of the first aspect, the video signal and the control information signal are transmitted by frequency multiplexing, so that the amount of control information is not limited. Necessary and sufficient control information can be sent quickly.

As described above, according to the camera monitoring system of the second aspect, since the control information is transmitted and received after being AM-modulated, appropriate transmission over a long distance can be performed as compared with the case where the control information is transmitted and received without modulation. Can be guaranteed.

As described above, according to the camera surveillance system according to the third aspect, the AM modulator controls the signal of the control information by the carrier of 10 MHz to 12.5 MHz.
6 MHz which is the frequency band of the video signal
AM modulation is performed using a carrier having an appropriate frequency while avoiding the following bands and avoiding a frequency band where attenuation is large.

As described above, according to the camera monitoring system of the fourth aspect, when the audio signal is modulated to the video signal, the control information signal is transmitted from 11 MHz to 12.7M.
Since the AM modulation is performed by the carrier of the Hz, the AM modulation is performed by the carrier of the appropriate frequency while avoiding the frequency band of the video signal in which the audio signal is modulated and avoiding the frequency band where the attenuation is increased.

As described above, according to the camera monitoring system according to the fifth aspect, when there is no control information signal to be transmitted, AM modulation is performed by a 0 MHz carrier. If there is no modulation operation, the modulation operation is not substantially performed, unnecessary modulation is not performed, power consumption is reduced, and the risk of noise caused by modulation when there is no control information signal to be transmitted can be eliminated. .

As described above, according to the camera monitoring system of the sixth aspect, the control information signal transmitted to the bus is multiplexed and transmitted to the camera device.
Control information can be transmitted and received as if the camera operating device and the camera device are connected to a bus, and a pair of controls can be performed.

As described above, according to the camera monitoring system of the seventh aspect, since it is detected whether or not the incoming control information is control information relating to a control target to which exclusive control is to be performed, a plurality of cameras can be detected. Exclusive control can be performed when an instruction is given from the operation device.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a bus connection of a camera monitoring system according to the present invention.

FIG. 2 is a detailed configuration diagram of a camera operating device in the camera monitoring system according to the present invention.

FIG. 3 is a detailed configuration diagram of a portion related to demultiplexing in a camera device and a camera operating device of the camera monitoring system according to the present invention.

FIG. 4 is a detailed configuration diagram of a portion related to transmission / reception signal separation in the camera device and the camera operating device of the camera monitoring system according to the present invention.

FIG. 5 is a block diagram showing an example of a camera device of the camera monitoring system according to the present invention.

FIG. 6 is a diagram showing frequency characteristics of a filter used in the camera monitoring system according to the present invention.

FIG. 7 shows an AM in the camera monitoring system according to the present invention.
FIG. 4 is a diagram for explaining modulation.

FIG. 8 is a diagram showing attenuation characteristics of a coaxial cable used for a transmission line of the camera monitoring system according to the present invention.

FIG. 9 is a configuration diagram of a portion related to demultiplexing in a camera device and a camera operating device of the camera monitoring system according to the present invention.

FIG. 10 is a configuration diagram of a portion related to demultiplexing in a camera operating device of the camera monitoring system according to the present invention.

FIG. 11 is a configuration diagram of a portion related to demultiplexing in the camera device of the camera monitoring system according to the present invention.

FIG. 12 is a configuration diagram of a camera device portion in the camera monitoring system according to the present invention.

FIG. 13 is a flowchart for explaining an exclusion process in the camera device of the camera monitoring system according to the present invention.

FIG. 14 is a configuration diagram of a camera monitoring system configured using a camera device that performs an exclusive process according to the present invention.

FIG. 15 is a configuration diagram of a conventional camera monitoring system.

FIG. 16 is a diagram for explaining conventional multiplexing of a video signal and a control information signal.

[Explanation of symbols]

1-1 to 1-n Camera controller 2-11 to 2-
n4 Camera device 3-1 to 3-n Operation console 4-1 to 4-n
Monitor 5, 5-1 to 5-n Bus 6-1 to 6-n
4 Buffer 10, 10-1 to 10-n Controller 11, 71 Selector 12-1 to 12-4 Video Separation Control Transmitter 13-1 to 13-4 AM Modulator / Demodulator 14-1, 14
-2 buffer 20-11 to 20n4 control device 21, 61C
PU 22, 69 Bidirectional RAM 23, 68 Communication processing unit 25, 62 I / O port 26 Interface 27 Numeric keypad 28 Panel switch 29 Display unit 30 External operation interface 31 Coaxial cable 32, 42 Transmission / reception separation unit

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Takanori Ikegami 3-1-1 Asahigaoka, Hino-shi, Tokyo Inside the Toshiba Hino Plant Co., Ltd.

Claims (7)

[Claims] 1. A camera surveillance system comprising: a camera device for capturing an image of a subject; and a camera operation device for controlling the camera device. A video signal and control information obtained by capturing an image are stored in the camera device. While a bidirectional multiplexing unit is provided for frequency multiplexing and separating control information from a signal coming from the camera operating device side, the camera operating device has a frequency multiplexed signal coming from the camera device as a video signal. A video separation control transmission unit that separates the control information into control information and sends the control information to the camera device side. 2. A bidirectional multiplexing unit and a video demultiplexing control transmitting unit each include an AM modulator for AM-modulating a control information signal before multiplexing, and a control information separating unit for separating control information from a multiplexed incoming signal. 2. The camera surveillance system according to claim 1, further comprising an AM demodulator for performing AM demodulation after the operation. 3. An AM modulator converts a control information signal to 10M.
The camera surveillance system according to claim 2, wherein AM modulation is performed by a carrier of 1 Hz to 12.5 MHz. 4. The camera device is provided with means for acquiring audio, the video signal is a signal obtained by modulating the audio signal acquired by the means, and the AM modulator converts the control information signal from 11 MHz to 12.7
3. The camera monitoring system according to claim 2, wherein AM modulation is performed by a carrier of MHz. 5. The camera monitoring system according to claim 2, wherein the AM modulator performs AM modulation using a 0 MHz carrier when there is no control information signal to be transmitted. . 6. A camera surveillance system comprising a camera device for imaging a subject and a camera operating device for controlling the camera device, wherein the camera device stores a video signal obtained by imaging and control information. While a bidirectional multiplexing unit is provided for frequency multiplexing and separating control information from a signal coming from the camera operating device side, the camera operating device has a frequency multiplexed signal coming from the camera device as a video signal. And a video separation control transmitting unit that transmits control information to the camera operating device side, and the control information and the video separation control transmitting unit that are separated by the video separation control transmitting unit. A bus for transmitting and receiving control information before transmission and a communication processing unit for transmitting and receiving control information via the bus are provided. Camera system according to claim and. 7. A camera device, comprising: a plurality of control targets including a control target to which exclusive control is to be performed; detection means for detecting whether incoming control information is control information relating to a control target to be subjected to exclusive control; 7. The camera surveillance system according to claim 6, further comprising a control execution unit that performs exclusive control when the detection unit detects control information on a control target to be subjected to exclusive control.