WO2018193580A1

WO2018193580A1 - Monitor camera system and monitor camera

Info

Publication number: WO2018193580A1
Application number: PCT/JP2017/015894
Authority: WO
Inventors: 裕神山
Original assignee: 三菱電機株式会社
Priority date: 2017-04-20
Filing date: 2017-04-20
Publication date: 2018-10-25
Also published as: JP6664545B2; JPWO2018193580A1

Abstract

A monitor camera system is provided with: a first monitor camera (1) located inside a closed space for capturing images of the door side of the closed space; and a second monitor camera (2) located outside the closed space, wherein the first monitor camera (1) receives a parameter having been set in the second monitor camera (2) for controlling the brightness and, when having determined that the door is about to open, starts capturing images by use of the parameter.

Description

Surveillance camera system and surveillance camera

The present invention relates to a surveillance camera system and a surveillance camera.

In a surveillance camera that selects one brightness control mode from among a plurality of brightness control modes and performs brightness control, if the switching of the brightness control mode quickly follows the change in illuminance in the imaging environment, the imaging screen becomes brighter or darker. Repeated hunting occurs. Patent Document 1 discloses that each brightness control mode has a time constant, and even if the illuminance of the imaging environment changes, the brightness of the imaging screen is gradually changed to prevent hunting. Also, in Patent Document 1, when a subject with high brightness such as a car headlight enters the screen, switching of the brightness control mode is skipped, and the brightness of the imaging screen is suitable for the illuminance of the imaging environment. It has been disclosed to shorten the time required to become.

JP 2011-193076 A ([0007], [0021], [0027])

In the configuration disclosed in Patent Document 1, each luminance control mode has a time constant. Therefore, when the luminance control cannot follow a change in illuminance in the imaging environment, whiteout or blackout occurs on the imaging screen. appear. For this reason, there is a time during which monitoring with the monitoring camera cannot be performed (hereinafter referred to as unmonitorable time). In the configuration disclosed in Patent Document 1, switching of the luminance control mode is skipped. However, since the feedback control is performed with respect to a change in the luminance level of the video signal, an unmonitorable time occurs immediately after the luminance level changes. It was.

The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a surveillance camera system and a surveillance camera that do not cause unobservable time when a door of a closed space is opened.

A surveillance camera system according to the present invention includes a first surveillance camera that is installed inside a closed space and images a door side of the closed space, and a second surveillance camera that is installed outside the closed space. When the first monitoring camera receives the parameter for controlling the brightness set in the second monitoring camera and determines that the door is opened, the first monitoring camera starts imaging using the parameter.

The monitoring camera according to the present invention is a monitoring camera that is installed inside a closed space and images the door side of the closed space, and controls the luminance set in the monitoring camera installed outside the closed space. And an imaging control unit that starts imaging using the parameters when it is determined that the door is opened.

According to the present invention, it is possible to obtain a surveillance camera system and a surveillance camera that do not cause unobservable time when the door of the closed space is opened.

1 is a configuration diagram of a surveillance camera system according to Embodiment 1. FIG. It is a figure which shows an example of application of the surveillance camera system which concerns on Embodiment 1. FIG. It is a figure for demonstrating the function of a surveillance camera. It is a figure for demonstrating automatic brightness control of a surveillance camera. 5A and 5B are diagrams illustrating a hardware configuration example of the surveillance camera. 6A and 6B are diagrams illustrating a hardware configuration example of the server. FIG. 6 is a sequence diagram (part 1) illustrating an operation of the surveillance camera system according to the first embodiment. FIG. 6 is a sequence diagram (part 2) illustrating the operation of the monitoring camera system according to the first embodiment. 6 is a configuration diagram of a surveillance camera system according to Embodiment 2. FIG. It is a figure which shows an example of application of the surveillance camera system which concerns on Embodiment 2. FIG. It is a figure which shows an example of LUT. FIG. 10 is a sequence diagram (part 1) illustrating an operation of the surveillance camera system according to the second embodiment. FIG. 10 is a sequence diagram (part 2) illustrating the operation of the monitoring camera system according to the second embodiment. 10 is a sequence diagram illustrating an operation of the surveillance camera system according to Embodiment 3. FIG.

Embodiment 1 FIG.
Hereinafter, in order to describe the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a configuration diagram of the surveillance camera system according to the first embodiment. The surveillance camera system according to Embodiment 1 includes a first surveillance camera 1, a second surveillance camera 2, a first server 3, a second server 4, a switch 5, an operation management unit 6, and the like. Is done.

FIG. 2 is a diagram illustrating an example of application of the monitoring camera system according to the first embodiment.
In the monitoring camera system according to Embodiment 1, when it is determined that the door of the closed space is opened, the automatic brightness control of the monitoring camera installed in the closed space is invalidated, and the monitoring camera installed outside the closed space is disabled. The brightness control parameter is set for the surveillance camera installed in the enclosed space.
Hereinafter, the surveillance camera installed in the closed space is referred to as the first surveillance camera 1 installed in the vehicle of the train 30 as a moving body. The surveillance camera installed outside the enclosed space is assumed to be the second surveillance camera 2 installed at the station 20 as a facility. The door of the closed space is a door 32 of the train 30.

FIG. 2 shows a state where the train 30 is stopped at the station 20. On the platform 21 of the station 20, there are passengers waiting to get on the train 30. An operation command room 22 is provided at the station 20. The train 30 is provided with a conductor room 31.

The train 30 includes a door 32. The passenger gets on the train 30 via the door 32. The passenger gets off the train 30 via the door 32. The door 32 is opened and closed by operating the switch 5 installed in the train 30. The switch 5 receives an operation input. The switch 5 is a signal indicating that it has been operated to open the door 32 (hereinafter referred to as a door opening operation signal), and a signal indicating that it has been operated to close the door 32 (hereinafter referred to as door closing operation signal). ) Is transmitted to the opening / closing mechanism provided in the door 32. The switch 5 transmits a door opening operation signal and a door closing operation signal to the first server 3 described later.

The switch 5 is installed in the conductor room 31 of the train 30. An open / close detection sensor 7 (not shown) that detects opening / closing of the door 32 can be attached to the door 32.
Further, a travel determination sensor 70 (not shown) for determining whether or not the train 30 is traveling can be attached to any location of the train 30. The travel determination sensor 70 is a first travel determination sensor 8 (not shown) that detects the vibration of the train 30 or a second travel determination sensor 9 (not shown) that detects the rotation of the wheels of the train 30.

The first surveillance camera 1 generates imaging data. The first monitoring camera 1 is installed in the train 30. The first surveillance camera 1 is installed on the upper part of the surface facing the door 32. Hereinafter, it is assumed that each vehicle of the train 30 has one door 32 and one first monitoring camera 1 is installed in each vehicle. However, the number of first surveillance cameras 1 to be installed may be appropriately determined according to the number of doors 32. The first surveillance camera 1 images the door 32 side. The first surveillance camera 1 images passengers getting on and off from the door 32. The first monitoring camera 1 transmits imaging data to the first server 3. The first server 3 is installed at an arbitrary location in the train 30. The first surveillance camera 1 and the first server 3 are connected by wire or wirelessly.

The second surveillance camera 2 generates imaging data. The second surveillance camera 2 is installed at the station 20. The second monitoring camera 2 is installed on the platform 21 or the like at the station 20. A plurality of second monitoring cameras 2 may be installed at a position above the door 32 of the stopped train 30. The second surveillance camera 2 images the door 32 side of the train 30. The second monitoring camera 2 images a position between the platform 21 and the train 30. The second monitoring camera 2 is installed to monitor whether there are any passengers who have fallen into the track from the platform 21 and whether there are any passengers caught between the doors 32. The second monitoring camera 2 transmits imaging data to the second server 4. The second server 4 is installed in the operation command room 22 of the station 20. The second monitoring camera 2 and the second server 4 are connected by wire or wirelessly.

The first monitoring camera 1 and the second monitoring camera 2 are configured to be capable of interlocking control via the first server 3 and the second server 4. Moreover, the 1st monitoring camera 1 and the 2nd monitoring camera 2 can be connected so that wireless communication is possible via a network, for example. Hereinafter, it is assumed that the surveillance camera 50 is configured by the first surveillance camera 1 and the second surveillance camera 2.
For example, the first server 3 and the second server 4 are connected via a network so that wireless communication is possible. Hereinafter, it is assumed that the server 60 is configured by the first server 3 and the second server 4.

As shown in FIG. 1, the first server 3 and the second server 4 include a control unit 201, a storage unit 202, a communication unit 203, and the like. The control unit 201 controls imaging of the monitoring camera 50. The storage unit 202 stores imaging data received from the monitoring camera 50. The communication unit 203 transmits and receives information. The communication unit 203 includes, for example, a network terminal for external connection, a signal input / output terminal, and the like.
The first server 3 is connected to the switch 5 by wire or wirelessly. The switch 5 transmits a door opening operation signal and a door closing operation signal to the first server 3.

The first server 3 is connected to the opening / closing detection sensor 7 in a wired or wireless manner when the opening / closing detection sensor 7 is attached to the door 32. The first server 3 receives a signal transmitted by the open / close detection sensor 7. The open / close detection sensor 7 transmits a signal indicating that the door 32 is opened (hereinafter referred to as a door open detection signal) and a signal indicating that the door 32 is closed (hereinafter referred to as a door close detection signal) to the first server 3. Send to.

The first server 3 is connected to the first traveling determination sensor 8 by wire or wireless when the first traveling determination sensor 8 is attached to the train 30. The first server 3 receives a signal transmitted by the first travel determination sensor 8.
When the train 30 is vibrating, the first travel determination sensor 8 determines that the train 30 is traveling, and a signal indicating that the train 30 is traveling (hereinafter referred to as a travel signal) is the first. Send to server 3.
When the train 30 is not vibrating, the first travel determination sensor 8 determines that the train 30 is stopped, and a signal indicating that the door 32 is just before the door 32 is opened (hereinafter referred to as door opening). A suggestion signal) to the first server 3. The timing just before the door 32 opens is, for example, 10 seconds before the door 32 opens.

The first server 3 is connected to the second traveling determination sensor 9 by wire or wireless when the second traveling determination sensor 9 is attached to the wheel of the train 30. The first server 3 receives a signal transmitted by the second travel determination sensor 9.
The second traveling determination sensor 9 determines that the train 30 is traveling when the wheels of the train 30 are rotating, and transmits a traveling signal to the first server 3.
When the wheels of the train 30 are not rotating, the second travel determination sensor 9 determines that the train 30 is stopped and transmits a door opening suggestion signal to the first server 3.

The second server 4 is connected to an operation management unit 6 described later by wire or wirelessly. The second server 4 receives a signal transmitted by the operation management unit 6.
When the operation management unit 6 detects that the train 30 is about to arrive at the station 20 soon, a signal indicating that the train 30 is just before the arrival at the station 20 (hereinafter referred to as an arrival indication signal) Send to server 4. The timing just before the train 30 arrives at the station 20 is, for example, one minute before the train 30 arrives at the station 20. However, it is not limited to one minute before, and may be 10 minutes before arrival or 30 minutes before arrival.
When the operation management unit 6 detects that the train 30 is about to leave the station 20 soon, a signal indicating that the train 30 is just before the departure from the station 20 (hereinafter referred to as a departure suggestion signal) Send to server 4. The timing just before the train 30 departs from the station 20 is, for example, one minute before the train 30 departs from the station 20.

The operation management unit 6 is a system in which a program for managing the operation of the train 30 is stored based on an operation diagram. The operation management unit 6 is a so-called train operation management system (PTC: Programmed Traffic Control). The operation management unit 6 is installed in the operation command room 22 of the station 20. The operation management unit 6 adjusts the operation interval or changes the departure time when a delay or the like occurs in the train 30. The operation management unit 6 monitors the operation of the train 30 and can detect that the train 30 will soon arrive at the station 20 and that the train 30 will soon depart from the station 20.

As shown in FIG. 1, the first surveillance camera 1 and the second surveillance camera 2 include a lens 100, an iris 101, an image sensor 102, a video signal processing unit 103, a video signal compression unit 104, and a network I / F unit 105. , An imaging control unit 106, a storage unit 107, a communication unit 108, and the like.

FIG. 3 is a diagram for explaining the function of the monitoring camera 50.
In the monitoring camera 50, the light incident on the lens 100 is adjusted to an appropriate exposure amount by the iris 101. The iris 101 is a diaphragm mechanism. The light adjusted to an appropriate exposure amount by the iris 101 enters the image sensor 102. The image sensor 102 converts the light into an electrical signal.

The electrical signal generated by the image sensor 102 is input to the video signal processing unit 103. The video signal processing unit 103 performs video signal processing on the electrical signal to generate a video signal. The processing of the video signal processing unit 103 includes processing for amplifying the luminance level of the video signal based on an AGC (Automatic Gain Control) value.

The video signal subjected to the video signal processing in the video signal processing unit 103 is input to the video signal compression unit 104. The video signal compression unit 104 encodes the video signal and generates encoded data. The encoded data generated by the video signal compression unit 104 is input to the network I / F unit 105.

The network I / F unit 105 transmits the encoded data to an external device. The encoded data is decoded by an external device and displayed as a captured image.

The luminance of the captured image is always required to be at an appropriate level regardless of the illuminance of the imaging environment. Therefore, the monitoring camera 50 performs automatic brightness control so that the brightness becomes an appropriate level.

The automatic brightness control performed by the surveillance camera 50 will be described. The imaging control unit 106 selects one luminance control mode from among a plurality of luminance control modes, and controls the luminance of the captured image. The plurality of luminance control modes include an iris control mode, an AGC control mode, and an exposure time control mode. The imaging control unit 106 switches the luminance control mode according to the illuminance of the imaging environment.

In the iris control mode, the opening / closing amount (hereinafter referred to as F value) of the iris 101 is controlled. In the iris control mode, the F value is controlled to adjust the amount of light incident on the image sensor 102.
In the AGC control mode, the AGC value is controlled. In the AGC control mode, the AGC value is controlled to adjust the amount of luminance level amplification in the video signal processing unit 103.
In the exposure time control mode, the electronic shutter speed of the image sensor 102 is controlled to control the exposure time. When the electronic shutter speed of the image sensor 102 is decreased, the exposure time becomes longer. As the exposure time becomes longer, the exposure amount increases and the brightness level of the captured image increases.

FIG. 4 is a diagram for explaining the automatic brightness control of the monitoring camera 50.
When the illuminance of the imaging environment changes from a high value to a low value, that is, when the imaging environment changes from a bright state to a dark state, the imaging control unit 106 changes the brightness control mode to an iris control mode, an AGC control mode, and an exposure time control. Switch in order of mode.

When the imaging environment is bright and the luminance level of the video signal is equal to or higher than the first threshold, the imaging control unit 106 selects the iris control mode. As shown in FIG. 4, in the iris control mode, the F value is variable, the AGC value is the minimum value, and the exposure time is fixed. The exposure time is fixed, for example, at 1/60 seconds.

In the iris control mode, even when the iris 101 is most opened, the imaging control unit 106 selects the AGC control mode when the luminance level of the video signal is smaller than the first threshold value. As shown in FIG. 4, in the AGC control mode, the F value is in an open state, that is, the minimum value, the AGC value is variable, and the exposure time is fixed.

Even when the luminance level of the video signal is amplified most when the AGC control mode is set, the imaging control unit 106 selects the exposure time control mode when the luminance level is smaller than the second threshold value. In the exposure time control mode, the F value is in an open state, that is, the minimum value, the AGC value is the maximum value, and the exposure time is variable.

In the first embodiment, the F value, the AGC value, and the exposure time are used as the brightness control parameters. The brightness control parameter is a parameter for controlling the brightness of the captured image.
The imaging control unit 106 performs feedback control according to the luminance level of the video signal, and changes the luminance control parameter that is variable in the corresponding luminance control mode.
The storage unit 107 stores a brightness control parameter, a first threshold value, a second threshold value, and the like.
The communication unit 108 transmits and receives information.

In automatic luminance control, the imaging control unit 106 switches the luminance control mode as the illuminance of the imaging environment changes. Each luminance control mode has a time constant. The time constant is determined in order to prevent hunting that occurs due to the rapid follow-up of switching of the luminance control mode. The time constant is stored in the storage unit 107. Since the time constant is determined, when the illuminance of the imaging environment changes greatly, it takes time until the luminance reaches an appropriate level. For example, when the illuminance of the imaging environment suddenly becomes brighter in the exposure time control mode, the brightness control mode is switched in the order of the exposure time control mode, the AGC control mode, and the iris control mode. .

The control unit 201 of the first server 3 enables automatic brightness control of the first monitoring camera 1 while the door 32 of the train 30 is closed and the train 30 is running. The imaging control unit 106 performs automatic luminance control and adjusts the luminance level of the video signal in accordance with the illuminance in the train 30. When the train 30 stops at the station 20 and the door 32 of the train 30 opens, passengers get on and off. At this time, when the platform 21 serving as an imaging environment is in a bright state or a dark state, and the difference between the illuminance in the train 30 and the illuminance of the platform 21 is a certain value or more, the switching of the luminance control mode is not in time.

The difference between the illuminance inside the train 30 and the illuminance of the platform 21 is equal to or greater than a certain value. When the platform 21 is brighter than the illuminance inside the train 30, the backlight is backlit and whiteout occurs in the captured image. Further, when the difference between the illuminance inside the train 30 and the illuminance of the platform 21 is a certain value or more, and the platform 21 is darker than the illuminance inside the train 30, the captured image is crushed black. If whiteout or blackout occurs in the captured image, it is impossible to confirm passengers or dangerous materials. Also, after the whiteout or blackout occurs in the captured image, it takes several seconds until the first monitoring camera 1 enters the luminance control mode suitable for the illuminance of the imaging environment and the luminance of the captured image reaches an appropriate level. Takes time. Therefore, the 1st monitoring camera 1 cannot image the passenger etc. which get on and off via the door 32 during the said time.

In the first embodiment, before the train 30 stops, the first monitoring camera 1 receives the brightness control parameter set in the second monitoring camera 2 via the server 60.
When it is determined that the door 32 of the train 30 is opened, the control unit 201 of the first server 3 invalidates the automatic brightness control of the first monitoring camera 1 and the brightness received from the second monitoring camera 2. The first surveillance camera 1 is caused to start imaging using the control parameter. By doing this, as described above, even when the illuminance of the imaging environment changes greatly when the door 32 is opened, it is possible to prevent overexposure or blackout in the captured image. it can.

The control unit 201 of the first server 3 can be configured to determine that the door 32 is opened in any of the following cases.
(1) When a door opening operation signal is received from the switch 5.
(2) When a door open detection signal is received from the open / close detection sensor 7.
(3) A case where a predetermined time has elapsed since the arrival suggestion signal is received from the operation management unit 6 and the arrival suggestion signal is received.
(4) A case where a predetermined time has elapsed after receiving the door opening suggestion signal from the travel determination sensor 70 and receiving the door opening suggestion signal.

When it is determined that the door 32 of the train 30 is closed or closed, the control unit 201 of the first server 3 enables automatic brightness control of the first monitoring camera 1.
The control unit 201 of the first server 3 can be configured to determine that the door 32 is closed or closed in any of the following cases.
(1) When a door closing operation signal is received from the switch 5.
(2) When a door close detection signal is received from the open / close detection sensor 7.
(3) A case where a predetermined time has elapsed since the departure suggestion signal was received from the operation management unit 6 and the departure suggestion signal was received.
(4) When a travel signal is received from the travel determination sensor 70.

Next, a hardware configuration example of the monitoring camera 50 will be described.
5A and 5B are diagrams illustrating a hardware configuration example of the monitoring camera 50.
The communication unit 108 in the monitoring camera 50 is a transmission / reception device 510 that performs wired or wireless communication. The imaging control unit 106 in the monitoring camera 50 can be a processing circuit 501 that is dedicated hardware as shown in FIG. 5A. Further, the imaging control unit 106 in the monitoring camera 50 can be a processor 502 that executes a program stored in the memory 503 as shown in FIG. 5B. In this case, the memory 503 may constitute the storage unit 107.

As shown in FIG. 5A, when the imaging control unit 106 is dedicated hardware, the processing circuit 501 includes, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated). Circuit), FPGA (Field-programmable Gate Array), or a combination thereof.

As shown in FIG. 5B, when the imaging control unit 106 is a processor 502, the function of the imaging control unit 106 is realized by software, firmware, or a combination of software and firmware. Software or firmware is described as a program and stored in the memory 503. The processor 502 implements the function of the imaging control unit 106 by reading and executing a program stored in the memory 503. That is, the imaging control unit 106 includes a memory 503 for storing a program that, when executed by the processor 502, results in the steps shown in FIG. These programs can also be said to cause a computer to execute the procedure or method of the imaging control unit 106.

Here, the processor 502 is, for example, a CPU (Central Processing Unit), a processing device, an arithmetic device, a processor, a microprocessor, a microcomputer, or a DSP (Digital Signal Processor).
The memory 503 may be a nonvolatile or volatile semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable ROM), or an EEPROM (Electrically EPROM). Further, it may be a magnetic disk such as a hard disk or a flexible disk, or an optical disk such as a mini disk, CD (Compact Disc), or DVD (Digital Versatile Disc).

Note that part of the functions of the imaging control unit 106 may be realized by dedicated hardware, and part of it may be realized by software or firmware. As described above, the processing circuit 501 in the monitoring camera 50 can realize the above-described functions by hardware, software, firmware, or a combination thereof.

Next, a hardware configuration example of the server 60 will be described.
6A and 6B are diagrams illustrating a hardware configuration example of the server 60.
The communication unit 203 in the server 60 is a transmission / reception device 610 that performs wired or wireless communication. The control unit 201 in the server 60 can be a processing circuit 601 that is dedicated hardware as shown in FIG. 6A. Further, the control unit 201 in the server 60 can be a processor 602 that executes a program stored in the memory 603 as shown in FIG. 6B. In this case, the memory 603 may constitute the storage unit 202.

As shown in FIG. 6A, when the control unit 201 is dedicated hardware, the processing circuit 601 includes, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit). ), FPGA (Field-programmable Gate Array), or a combination thereof.

As shown in FIG. 6B, when the control unit 201 is a processor 602, the function of the control unit 201 is realized by software, firmware, or a combination of software and firmware. Software or firmware is described as a program and stored in the memory 603. The processor 602 implements the function of the control unit 201 by reading and executing a program stored in the memory 603. That is, the control unit 201 includes a memory 603 for storing a program that, when executed by the processor 602, results in the steps shown in FIG. These programs can also be said to cause a computer to execute the procedure or method of the control unit 201.

Here, the processor 602 is, for example, a CPU (Central Processing Unit), a processing device, an arithmetic device, a processor, a microprocessor, a microcomputer, or a DSP (Digital Signal Processor).
The memory 603 may be a nonvolatile or volatile semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable ROM), or an EEPROM (Electrically EPROM). Further, it may be a magnetic disk such as a hard disk or a flexible disk, or an optical disk such as a mini disk, CD (Compact Disc), or DVD (Digital Versatile Disc).

Note that a part of the function of the control unit 201 may be realized by dedicated hardware, and a part may be realized by software or firmware. As described above, the processing circuit 601 in the server 60 can realize the above-described functions by hardware, software, firmware, or a combination thereof.

Next, the operation of the surveillance camera system according to Embodiment 1 will be described.
7A and 7B are examples of sequence diagrams illustrating the operation of the surveillance camera system according to Embodiment 1. FIG. A series of operations when the train 30 starts running, the train 30 stops at the station 20, and the train 30 departs from the station 20 will be described.
The control unit 201 of the first server 3 transmits a signal instructing to enable automatic brightness control to the first monitoring camera 1 (step ST101).
When receiving the signal, the imaging control unit 106 of the first monitoring camera 1 validates the automatic brightness control (step ST102).
When the operation management unit 6 detects that the train 30 will soon arrive at the station 20, the operation management unit 6 transmits an arrival suggestion signal to the second server 4 (step ST103).
When receiving the arrival suggestion signal, the control unit 201 of the second server 4 transmits a request for a brightness control parameter to the second monitoring camera 2 (step ST104). At this time, the operation management unit 6 may transmit the request to the second monitoring camera 2.

When receiving the request, the imaging control unit 106 of the second monitoring camera 2 transmits the brightness control parameter to the second server 4 (step ST105). Note that the imaging control unit 106 of the second monitoring camera 2 may transmit the brightness control parameter to the first server 3. Further, the imaging control unit 106 of the second monitoring camera 2 may transmit the brightness control parameter to the first monitoring camera 1.

The control unit 201 of the second server 4 transmits the brightness control parameter to the first server 3 (step ST106). Note that the control unit 201 of the second server 4 may transmit the brightness control parameter to the first monitoring camera 1.
The control unit 201 of the first server 3 transmits the brightness control parameter to the first monitoring camera 1 (step ST107).

The switch 5 transmits a door opening operation signal to the first server 3 (step ST108). The switch 5 may transmit a door opening operation signal to the first monitoring camera 1.
When receiving the door opening operation signal, the control unit 201 of the first server 3 determines that the door 32 is opened, and instructs the imaging to be performed using the luminance control parameter transmitted in step ST107 with automatic luminance control disabled. A signal (hereinafter referred to as a first imaging switching instruction signal) is transmitted to the first monitoring camera 1 (step ST109).
When receiving the first imaging switching instruction signal, the imaging control unit 106 of the first monitoring camera 1 disables automatic brightness control (step ST110).
The imaging control unit 106 of the first monitoring camera 1 captures an image using the brightness control parameter of the second monitoring camera 2 received in step ST107 (step ST111).
When the first monitoring camera 1 directly receives the door opening operation signal from the switch 5, the imaging control unit 106 of the first monitoring camera 1 invalidates the automatic brightness control and receives the first monitoring camera 1 received in step ST107. The image is picked up using the brightness control parameter of the second monitoring camera 2.

The switch 5 transmits a door closing operation signal to the first server 3 (step ST112). The switch 5 may transmit a door closing signal to the first monitoring camera 1.
When the control unit 201 of the first server 3 receives the door closing operation signal, the control unit 201 determines that the door 32 is closed and instructs to enable automatic brightness control (hereinafter referred to as a second imaging switching instruction signal). Is transmitted to the first surveillance camera 1 (step ST113). When receiving the second imaging switching instruction signal, the imaging control unit 106 of the first monitoring camera 1 validates the automatic brightness control (step ST114).
In step ST113, the control unit 201 of the first server 3 sets the luminance control mode and the luminance control parameter when the first imaging switching instruction signal is transmitted in step ST109, so that the first monitoring camera 1 is set again. To instruct.
When the first monitoring camera 1 directly receives the door closing operation signal from the switch 5, the imaging control unit 106 of the first monitoring camera 1 enables automatic brightness control. At this time, the brightness control mode and the brightness control parameter when automatic brightness control is disabled in step ST110 are set again.

In step ST109, when the control unit 201 of the first server 3 receives the door opening operation signal transmitted from the switch 5, the first imaging switching instruction signal is transmitted to the first monitoring camera 1.
The control unit 201 of the first server 3 may transmit a first imaging switching instruction signal to the first monitoring camera 1 when receiving the door opening detection signal transmitted by the opening / closing detection sensor 7.

In addition, after the control unit 201 of the second server 4 receives the arrival suggestion signal transmitted by the operation management unit 6 and has received a predetermined time after receiving the arrival suggestion signal, the first server 3 The control unit 201 may transmit the first imaging switching instruction signal to the first monitoring camera 1.

Moreover, after the control part 201 of the 1st server 3 receives the door opening suggestion signal which the 1st driving | running | working determination sensor 8 or the 2nd driving | running | working determination sensor 9 transmitted, after receiving a door opening suggestion signal, it is beforehand. The control unit 201 of the first server 3 may transmit a first imaging switching instruction signal to the first monitoring camera 1 after a predetermined time has elapsed.

In step ST113, when the control unit 201 of the first server 3 receives the door closing operation signal transmitted by the switch 5, the second imaging switching instruction signal is transmitted to the first monitoring camera 1.
The control unit 201 of the first server 3 may transmit a second imaging switching instruction signal to the first monitoring camera 1 when receiving the door close detection signal transmitted by the open / close detection sensor 7.

Moreover, after the control part 201 of the 2nd server 4 receives the departure suggestion signal which the operation management part 6 transmitted, and predetermined time passes after receiving a departure suggestion signal, the 1st server 3 The control unit 201 may transmit the second imaging switching instruction signal to the first monitoring camera 1.

In addition, when the control unit 201 of the first server 3 receives the travel signal transmitted from the first travel determination sensor 8 or the second travel determination sensor 9, the second imaging switching instruction signal is transmitted to the first monitor. You may make it transmit to the camera 1. FIG.

In the above description, it is assumed that the imaging control unit 106 of the second monitoring camera 2 transmits the brightness control parameter in response to the request (step ST105). However, the present invention is not limited to this, and the imaging control unit 106 of the second monitoring camera 2 periodically transmits the brightness control parameter to the second server 4 or the like even when there is no such request. Also good.

In addition, the brightness control parameter of the second monitoring camera 2 used by the imaging control unit 106 of the first monitoring camera 1 is the brightness control set in the second monitoring camera 2 immediately before the door 32 is opened. It is not limited to parameters. For example, even if the brightness control parameter is set in the second monitoring camera 2 30 minutes before the train 30 arrives at the station 20, an effect of suppressing the occurrence of the unmonitorable time can be obtained.

In the above description, the monitoring camera 50 and the server 60 are provided to configure the monitoring camera system. However, the present invention is not limited to this, and the server 60 can be provided and only the monitoring camera 50, that is, the first monitoring camera 1 and the second monitoring camera 2 can be used. In that case, the imaging control unit 106 serves the function of the control unit 201. In addition, the storage unit 107 functions as the storage unit 202. Further, the communication unit 108 functions as the communication unit 203.

As described above, the surveillance camera system according to Embodiment 1 is installed inside the closed space, and the first surveillance camera 1 that images the door side of the closed space and the second installed outside the closed space. When the first surveillance camera 1 receives the parameter for controlling the brightness set in the second surveillance camera 2 and determines that the door is opened, the first surveillance camera 1 uses the parameter. To start imaging. For this reason, when the door of closed space opens, the surveillance camera system which does not produce unmonitorable time can be obtained.

Moreover, the 1st monitoring camera 1 installed in the inside of closed space and imaging the door side of closed space controls the brightness | luminance set to the 2nd monitoring camera 2 installed in the exterior of closed space. And an imaging control unit 106 that starts imaging using the parameters when it is determined that the door is opened. For this reason, when the door of the closed space is opened, a surveillance camera that does not cause unobservable time can be obtained.

Further, according to the surveillance camera system according to the first embodiment, the brightness of the captured image can be maintained at an appropriate level even when the illuminance of the imaging environment changes, and the visibility of the captured image can be improved. it can.

Further, in the surveillance camera system according to Embodiment 1, the server 60 is set to the second surveillance camera 2 installed outside the closed space based on the arrival suggestion signal transmitted from the operation management unit 6. The control parameter is received, and the brightness control parameter is transmitted to the first monitoring camera 1 installed in the closed space. Thereby, for example, even when a delay or the like occurs in the operation of the train 30 and the diagram is changed, the server 60 sends the brightness control parameter from the second monitoring camera 2 at a timing suitable for the changed diagram. The brightness control parameter is received and transmitted to the first monitoring camera 1. For this reason, when the diagram is changed, the server 60 receives the brightness control parameter from the second monitoring camera 2 and adjusts the timing for transmitting the brightness control parameter to the first monitoring camera 1. It can be omitted.

Embodiment 2. FIG.
FIG. 8 is a configuration diagram of the surveillance camera system according to the second embodiment. The surveillance camera system according to Embodiment 2 includes a surveillance camera 1a, a server 3a, a switch 5, an information acquisition unit 10, a terminal 11, and the like. The description of the structure having the same or corresponding function as the structure described in Embodiment 1 is omitted or simplified.

In the first embodiment, the configuration in which the brightness control parameter of the second monitoring camera 2 installed outside the closed space is set in the first monitoring camera 1 installed inside the closed space has been described. This configuration controls the second surveillance camera 2 installed outside the enclosed space in conjunction with the first surveillance camera 1 installed inside the enclosed space, and is a system that extends inside and outside the enclosed space. As a result, the scale of the system is large.
On the other hand, in the second embodiment, the surveillance camera system is configured only in the enclosed space, and brightness control equivalent to the configuration according to the first embodiment is realized.

FIG. 9 is a diagram illustrating an example of application of the surveillance camera system according to the second embodiment.
The server 3 a, the information acquisition unit 10, and the terminal 11 are installed at any location in the train 30.

The information acquisition unit 10 and the terminal 11 are connected to the server 3a by wire or wireless.
The information acquisition unit 10 includes a GPS sensor or the like. The information acquisition unit 10 always acquires the position information, date information, and time information of the train 30. The position information includes latitude and longitude. The information acquisition unit 10 transmits the position information, date information, and time information of the train 30 to the server 3a.

The terminal 11 is composed of a WEB terminal or the like. The terminal 11 is connected to the network. The terminal 11 can acquire weather information via the network. The terminal 11 transmits weather information to the server 3a.

In the storage unit 202 of the server 3a, a look-up table (hereinafter referred to as LUT) is stored. FIG. 10 is a diagram illustrating an example of an LUT. Luminance control parameters are stored in the LUT. The brightness control parameter is determined in advance by performing a running test of the train 30 or the like. The brightness control parameters in the second embodiment are an F value, an electronic shutter speed, and an AGC value.

The server 3 a always receives the position information, date information, and time information of the train 30 from the information acquisition unit 10. The server 3a receives the weather information acquired by the terminal 11. Based on the location information received from the information acquisition unit 10, the control unit 201 of the server 3a specifies the station 20 to stop next. When the control unit 201 of the server 3a determines that it is a timing just before the train 30 arrives at the station 20 based on the position information, the control unit 201 refers to the LUT and sets the brightness control parameter to be set in the monitoring camera 1a at the station 20. Specific for each vehicle. The control unit 201 of the server 3a specifies the brightness control parameter based on the position information, date information, and time information received from the information acquisition unit 10. At this time, the control unit 201 of the server 3a may be configured to specify the brightness control parameter based on the weather information received from the terminal 11. Below, the case where the control part 201 of the server 3a specifies the said brightness | luminance control parameter based on position information, date information, time information, and weather information is demonstrated.
Further, the brightness control parameter specified by the control unit 201 of the server 3a with reference to the LUT is referred to as an LUT reference parameter. The control unit 201 of the server 3a transmits the LUT reference parameter to the monitoring camera 1a.

Next, the operation of the surveillance camera system according to Embodiment 2 will be described.
11A and 11B are sequence diagrams illustrating an example of the operation of the monitoring camera system according to Embodiment 2.

The control unit 201 of the server 3a transmits a signal instructing to enable automatic brightness control to the monitoring camera 1a (step ST201).
When receiving the signal, the imaging control unit 106 of the monitoring camera 1a enables automatic luminance control (step ST202).
The information acquisition unit 10 always transmits the position information, date information, and time information of the train 30 to the server 3a (step ST203).
When the control unit 201 of the server 3a determines that it is a timing just before the train 30 arrives at the station 20 based on the position information, the control unit 201 requests the terminal 11 for weather information of the station 20 (step ST204).
The terminal 11 acquires the weather information of the station 20 via the network, and transmits the weather information to the server 3a (step ST205).
The control unit 201 of the server 3a refers to the LUT, and specifies the brightness control parameter to be set for the monitoring camera 1a at the station 20 for each vehicle based on the information received from the information acquisition unit 10 and the terminal 11 (step ST206).
The control unit 201 of the first server 3 transmits the LUT reference parameter specified in step ST206 to the monitoring camera 1a (step ST207).

The switch 5 transmits a door opening operation signal to the server 3a (step ST208).
When the control unit 201 of the server 3a receives the door opening operation signal, the control unit 201 disables the automatic luminance control and instructs the imaging using the LUT reference parameter transmitted in step ST207 (third imaging switching instruction signal). Is transmitted to the monitoring camera 1a (step ST209).
When receiving the third imaging switching instruction signal, the imaging control unit 106 of the monitoring camera 1a disables the automatic brightness control (step ST210).
The imaging control unit 106 of the monitoring camera 1a performs imaging using the LUT reference parameter received in step ST207 (step ST211).

The switch 5 transmits a door closing operation signal to the server 3a (step ST212).
When receiving the door closing operation signal, the control unit 201 of the server 3a transmits a signal (fourth imaging switching instruction signal) instructing to enable automatic luminance control to the monitoring camera 1a (step ST213).
When receiving the fourth imaging switching instruction signal, the imaging control unit 106 of the monitoring camera 1a enables automatic brightness control (step ST214).

The case where the surveillance camera system is configured by the surveillance camera 1a and the server 3a has been described above. However, it is not limited to this, It can comprise only the surveillance camera 1a, without providing the server 3a. In that case, the imaging control unit 106 serves the function of the control unit 201. In addition, the storage unit 107 functions as the storage unit 202. Further, the communication unit 108 functions as the communication unit 203.
In the above description, the information acquisition unit 10 and the terminal 11 are separated from the monitoring camera 1a. However, the function of the information acquisition unit 10 and the function of the terminal 11 are configured to be included in the monitoring camera 1a. be able to.

As described above, the surveillance camera system according to Embodiment 2 is installed in a closed space that is a moving body, and the monitoring camera 1a that images the door side of the closed space, date information, time information, and the moving body. The information acquisition unit 10 for acquiring the position information of the camera, and a look-up table in which parameters for controlling the brightness, which are predetermined parameters, are stored, and based on the information received from the information acquisition unit 10 And a server 3a for specifying a reference parameter to be set in the surveillance camera 1a and transmitting the reference parameter to the surveillance camera 1a. When the surveillance camera 1a determines that the door is opened, the surveillance camera 1a starts imaging using the reference parameter. By selecting a parameter based on location, date, and time information from predetermined parameters and controlling the brightness of the captured image using the parameter, the surveillance camera system can be used only in a closed space. Can be built. As a result, the same effects as those of the first embodiment can be obtained while reducing the scale of the system.

Embodiment 3 FIG.
Since the configuration of the surveillance camera system according to Embodiment 3 is the same as the configuration shown in FIG. 8, the description of the configuration diagram is omitted. Further, the description of the structure having the same or equivalent function as the structure described in

Embodiments

1 and 2 is omitted or simplified.

In the second embodiment, when it is detected that the door of the closed space is opened, the automatic luminance control of the monitoring camera 1a installed in the closed space is invalidated and the LUT reference parameter is set in the monitoring camera 1a. At this time, the brightness control parameter stored in the LUT was a fixed value.
In the third embodiment, a configuration for updating the brightness control parameters stored in the LUT as necessary will be described.

Even if the control unit 201 of the server 3a receives the door opening operation signal, the control unit 201 does not transmit an instruction to invalidate the automatic brightness control of the monitoring camera 1a to the monitoring camera 1a. Thereby, the automatic brightness control of the monitoring camera 1a remains valid. When the imaging control unit 106 of the monitoring camera 1a receives a signal for instructing imaging using the LUT reference parameter from the server 3a, the imaging control unit 106 performs imaging using the LUT reference parameter and performs automatic luminance control as necessary. .

The imaging control unit 106 of the monitoring camera 1a performs automatic luminance control when the luminance level of the video signal does not become an appropriate level even when imaging is performed using the LUT reference parameter.
The imaging control unit 106 of the monitoring camera 1a performs automatic luminance control, and uses a luminance control parameter (hereinafter referred to as an adjusted luminance control parameter) different from the LUT reference parameter.
The imaging control unit 106 of the monitoring camera 1a obtains a difference between the adjustment brightness control parameter and the LUT reference parameter, and transmits the difference to the server 3a. The control unit 201 of the server 3a reflects the difference on the LUT stored in the storage unit 107. That is, the control unit 201 of the server 3a updates the brightness control parameter stored in the LUT by adding or subtracting the difference. Thereby, the accuracy of the brightness control parameter stored in the LUT can be improved.

Next, the operation of the surveillance camera system according to Embodiment 3 will be described.
FIG. 12 is a sequence diagram illustrating an example of the operation of the monitoring camera system according to the third embodiment. FIG. 12 illustrates a case where the imaging control unit 106 of the monitoring camera 1a performs automatic luminance control because the luminance level of the video signal does not become an appropriate level even when imaging is performed using the LUT reference parameter.

Since step ST301 to step ST308 are the same as step ST201 to step ST208 shown in FIG. 11A and FIG. 11B, overlapping description and explanation are omitted.

When receiving the door opening operation signal, the control unit 201 of the server 3a transmits a signal instructing to take an image using the LUT reference parameter to the monitoring camera 1a (step ST309).
When receiving the door opening operation signal, the imaging control unit 106 of the monitoring camera 1a takes an image using the LUT reference parameter (step ST310).
The imaging control unit 106 of the monitoring camera 1a performs imaging using the LUT reference parameter, but performs automatic luminance control because the luminance level of the video signal does not become an appropriate level (step ST311).
When performing the automatic brightness control, the imaging control unit 106 of the monitoring camera 1a obtains a difference between the adjusted brightness control parameter and the LUT reference parameter, and transmits the difference to the server 3a (step ST312).
The control unit 201 of the server 3a reflects the difference on the LUT (step ST313).

In the above, in step ST311, the imaging control unit 106 of the monitoring camera 1a performs automatic luminance control. Therefore, even if the server 3a that has received the door closing operation signal from the switch 5 transmits a signal (fourth imaging switching instruction signal) instructing to enable the automatic brightness control to the monitoring camera 1a, the monitoring camera 1a Since the automatic brightness control is already enabled, the setting of the monitoring camera 1a is not changed.
On the other hand, when the imaging control unit 106 of the monitoring camera 1a performs imaging using the LUT reference parameter and the luminance level of the video signal is an appropriate level in step ST311, the monitoring camera 1a performs automatic luminance control. Absent. In that case, when the surveillance camera 1a receives the fourth imaging switching instruction signal from the server 3a, the surveillance camera 1a validates the automatic brightness control.

As described above, according to the surveillance camera system according to the third embodiment, the brightness control parameters stored in the LUT can be updated to improve the brightness control accuracy of the captured image.

In the present invention, within the scope of the invention, any combination of the embodiments, or any modification of any component in each embodiment, or omission of any component in each embodiment is possible. .

The surveillance camera system according to the present invention is suitable for use in monitoring passengers and the like because there is no unmonitorable time even if the illuminance of the imaging environment changes.

1 1st surveillance camera, 1a surveillance camera, 2nd surveillance camera, 3rd first server, 3a server, 4th server, 5 switch, 6 operation manager, 7 open / close detection sensor, 8 1st Travel determination sensor, 9 second travel determination sensor, 10 information acquisition unit, 11 terminal, 20 station, 21 platform, 22 operation control room, 30 train, 31 conductor room, 32 doors, 50 door monitoring camera, 60 server, 70 travel Determination sensor, 100 lens, 101 iris, 102 image sensor, 103 video signal processing unit, 104 video signal compression unit, 105 network I / F unit, 106 imaging control unit, 107 storage unit, 108 communication unit, 201 control unit, 202 Storage unit, 203 communication unit.

Claims

A first surveillance camera installed inside the closed space and imaging the door side of the closed space;
A second surveillance camera installed outside the enclosed space,
When the first monitoring camera receives the parameter for controlling the brightness set in the second monitoring camera and determines that the door is opened, the first monitoring camera starts imaging using the parameter. Characteristic surveillance camera system.
A switch that accepts an operation input and outputs a signal indicating that the door is opened;
The monitoring camera system according to claim 1, wherein when the first monitoring camera receives the signal, the first monitoring camera determines that the door is opened.
An opening / closing detection sensor for detecting opening / closing of the door and outputting a signal indicating that the door is opened;
The monitoring camera system according to claim 1, wherein when the first monitoring camera receives the signal, the first monitoring camera determines that the door is opened.
The first surveillance camera is installed inside the closed space which is a moving body,
The surveillance camera system according to claim 1, wherein the second surveillance camera is installed outside the moving body and in a facility where the moving body stops.
An operation management unit that manages the operation of the mobile body and outputs a signal indicating that the mobile body is a little before the arrival at the facility,
The monitoring camera system according to claim 4, wherein the first monitoring camera determines that the door is opened when a predetermined time has elapsed after receiving the signal.
It is determined whether or not the moving body is traveling, and when it is determined that the moving body is stopped, a traveling determination sensor that outputs a signal indicating that it is a timing just before the door opens,
The monitoring camera system according to claim 4, wherein the first monitoring camera determines that the door is opened when a predetermined time has elapsed after receiving the signal.
An operation management unit that manages the operation of the mobile body and outputs a signal indicating that the mobile body is a little before the arrival at the facility;
The monitoring camera system according to claim 4, further comprising a server that receives the parameter from the second monitoring camera and transmits the parameter to the first monitoring camera.
When the first surveillance camera selects one brightness control mode from a plurality of brightness control modes, executes automatic brightness control for controlling the brightness of the captured image, and determines that the door is opened, 2. The surveillance camera system according to claim 1, wherein when the brightness control is invalidated and the door is closed, the automatic brightness control is validated.
A surveillance camera that is installed inside a closed space that is a moving body and images the door side of the closed space;
An information acquisition unit for acquiring date information, time information, and position information of the moving body;
A reference parameter, which is a predetermined parameter and stores a parameter for controlling brightness, is identified, and a reference parameter to be set in the monitoring camera is specified based on information received from the information acquisition unit. A server for transmitting the reference parameter to the surveillance camera,
When the monitoring camera determines that the door is opened, the monitoring camera system starts imaging using the reference parameter.
The surveillance camera selects one brightness control mode from a plurality of brightness control modes, executes automatic brightness control for controlling the brightness of the captured image, and determines that the door is opened, the automatic brightness control is performed. The surveillance camera system according to claim 9, wherein the automatic brightness control is validated when it is determined to be invalid and the door is closed.
The said server specifies the said reference parameter, if it determines with it being the timing just before the said mobile body arrives at a facility based on the positional information acquired from the said information acquisition part. Surveillance camera system.
The surveillance camera selects one brightness control mode from a plurality of brightness control modes, and executes automatic brightness control for controlling the brightness of a captured image;
The server receives a difference between the parameter and the reference parameter, which is transmitted when the monitoring camera performs automatic brightness control and uses a parameter different from the reference parameter, and receives the difference between the parameter and the reference parameter, based on the difference. The surveillance camera system according to claim 9, wherein the surveillance camera system is updated.
A surveillance camera that is installed inside a closed space and images the door side of the closed space,
An imaging control unit configured to receive a parameter for controlling brightness set in a monitoring camera installed outside the enclosed space and start imaging using the parameter when it is determined that the door is opened. A surveillance camera.
The imaging control unit determines that the door is opened when receiving a signal indicating that the door is opened or a signal indicating that the door is opened. Surveillance camera.
It is installed inside the enclosed space that is a moving body,
The monitoring camera according to claim 13, wherein the imaging control unit receives the parameter from a monitoring camera installed outside the moving body and in a facility where the moving body stops.
The imaging control unit determines that the door is opened when a predetermined time has elapsed after receiving a signal indicating that it is a timing just before the moving object arrives at the facility. The surveillance camera according to claim 15.
The imaging control unit determines that the door is opened when a predetermined time elapses after receiving a signal indicating that the timing of the moving body is just before the door is opened. The surveillance camera according to claim 15.
The imaging control unit selects one brightness control mode from a plurality of brightness control modes, executes automatic brightness control for controlling brightness of a captured image, and determines that the door is opened, the automatic brightness control 14. The surveillance camera according to claim 13, wherein the automatic brightness control is validated when it is determined that the door is closed and the door is closed.