JP2019175779A - Control system, control unit, and transmission method for image data of control system - Google Patents

Abstract

To provide a control system capable of transmitting image data of a camera connected to the same communication line with other equipment without exerting any influence on control over the other equipment.SOLUTION: A building management system 1 includes a gateway device 12 and a plurality of cameras 18. The gateway device 12 has: an image acquisition command transmission part which transmits an image acquisition command to the plurality of cameras 18 through communication lines L2, L3; and a transmission request command transmission part which transmits a transmission request command, requesting each camera 18 to transmit partial image data as a part of acquired image data, to the plurality of cameras 18. Each camera 18 acquires an image on receiving the image acquisition command, stores acquired image data in a memory 18a, and transmits partial image data of image data stored in the memory 18a to the gateway device 12 in response to the transmission request command.SELECTED DRAWING: Figure 4

Description

  Embodiments described herein relate generally to a control system, a control apparatus, and a method for transmitting image data in the control system.

  In recent years, monitoring or control using image data is performed in a control system such as a building management system. In a monitoring system using real-time video, camera image data is transmitted to the center device in real time.

  Since the amount of image data is large, a high-speed communication line is required between the center apparatus and the camera. In particular, when a plurality of cameras are installed, a dedicated high-speed communication line is required for transmitting image data.

  In addition, the camera may have functions such as various calculations and determinations. For example, some cameras perform human detection processing by performing image processing on image data obtained by imaging. When the camera detects a person by image processing, in a system in which a person detection signal indicating that a person has been detected is transmitted to the center apparatus, image data is not transmitted to the center apparatus, and only the person detection signal is sent to the center apparatus. Sent.

However, settings related to images such as human detection areas used for image processing performed in the camera may be performed in the center device, and only for such settings, for transmitting image data from the camera to the center device. Laying a high-speed communication line is not economical because it creates an over-specification system.
Furthermore, if the camera is connected to the same communication line as other devices in the control system and image data is transmitted / received, the transmission / reception of other signals in the control system is delayed, which may affect the control of other devices. .

JP-A-2015-155815

  Therefore, the present embodiment provides a control system, a control device, and an image data transmission method capable of transmitting image data of a camera connected to the same communication line as other devices without affecting the control of other devices. The purpose is to provide.

  The control system device according to the embodiment is a control system in which the plurality of devices, the control device that controls the plurality of devices, and a camera are connected via a communication line, and an image is transmitted to the camera via the communication line. An image acquisition command transmission unit that transmits an acquisition command, an image acquisition unit that is provided in the camera and receives the image acquisition command, acquires an image and stores the acquired image data in a memory, and is acquired by the camera A transmission request command transmission unit that transmits to the camera a transmission request command for requesting transmission of partial image data that is a part of the image data that has been received, and the memory is provided according to the transmission request command. An image data transmitting unit that transmits the partial image data of the image data stored in the image data to the control device.

  According to the present embodiment, a control system, a control device, and an image data transmission method capable of transmitting image data of a camera connected to the same communication line as other devices without affecting the control of other devices. Can be provided.

It is a block diagram of the building management system concerning this embodiment. It is a figure which shows the example of the person detection area | region in the image concerning this embodiment. It is a block diagram which shows the structure of the gateway apparatus concerning this embodiment. It is a flowchart which shows the example of the flow of the image acquisition process in the gateway apparatus concerning this embodiment. It is a flowchart of operation | movement of the camera which received the simultaneous image acquisition command concerning this embodiment. It is a flowchart which shows the example of the flow of the transmission process of the image data in a camera concerning this embodiment.

  The control system of the present embodiment is a control system in which the plurality of devices, a control device that controls the plurality of devices, and a camera are connected via a communication line, and an image is transmitted to the camera via the communication line. An image acquisition command transmission unit that transmits an acquisition command, an image acquisition unit that is provided in the camera and receives the image acquisition command, acquires an image and stores the acquired image data in a memory, and is acquired by the camera A transmission request command transmission unit that transmits to the camera a transmission request command for requesting transmission of partial image data that is a part of the image data that has been received, and the memory is provided according to the transmission request command. An image data transmitting unit that transmits the partial image data of the image data stored in the image data to the control device.

Hereinafter, embodiments will be described with reference to the drawings.
(First embodiment)
(Constitution)
FIG. 1 is a configuration diagram of a building management system according to the present embodiment. The building management system 1 of this embodiment is a control system that controls and monitors lighting fixtures in a building.

  The building management system 1 is a control system, and includes a management device 11 as a center device, a plurality of gateway devices 12 that can communicate with the management device 11, a controller 13 connected to each gateway device 12, and a controller 13. And a plurality of connected devices 14.

The management device 11 is connected to a plurality of gateway devices 12 through a communication line L1 such as a LAN.
Each gateway device 12 is connected to the controller 13 by a communication line L2.

  Each controller 13 is connected to a plurality of devices 14 via a communication line L3. The communication line L3 is, for example, a two-wire transmission line.

  The management device 11 is a personal computer, for example, and includes a keyboard, a mouse, a monitor, and the like. The administrator of the building management system 1 can set various control programs to be executed, a time schedule, and the like for each gateway device 12 while watching the monitor. Furthermore, the administrator can also set the monitoring area of each camera described later.

  The gateway device 12 is, for example, a box computer, relays various command signals from the management device 11 received via the communication line L1, executes processing according to the received command signals, and according to a time schedule. A command signal is output to the controller 13.

  The controller 13 includes, for example, a microcomputer, generates a control command signal in accordance with a command signal from the gateway device 12, and outputs the control command signal to the communication line L3. A detection signal from the sensor is received. Signals for monitoring and controlling each device 14 are transmitted and received via the communication line L3.

The plurality of devices 14 includes a lighting fixture 15, an illuminance sensor 16, a wall switch 17, a camera 18, and the like. Here, a plurality of cameras 18 are connected to the communication line L3.
The gateway device 12 controls the controller 13 via the communication line L2 so as to control each lighting device 15 in the building according to the time schedule for each area.

  Further, as will be described later, the gateway device 12 stores the image data from the plurality of cameras 18 in the storage device 25 via the controller 13, and requests the requested camera 18 in response to a transmission request from the management device 11. Are transmitted to the management apparatus 11.

  A plurality of controllers 13 are installed in the building, and the plurality of devices 14 are connected to the plurality of controllers 13 via communication lines L3. For example, a plurality of lighting fixtures 15, a plurality of illuminance sensors 16, a plurality of wall switches 17, and a plurality of cameras 18 are connected to each controller 13 as a device 14.

Each controller 13 performs on / off control or dimming control of the lighting fixture 15 based on the operation state of the wall switch 17, a human detection signal from the camera 18, and the like. Furthermore, each controller 13 outputs a control command signal for turning on or off the lighting fixture 15 to the communication line L3 in accordance with a command signal from the management device 11.
Furthermore, as will be described later, each controller 13 receives information on the monitoring area of each camera 18 from the management apparatus 11 and transmits it to each camera 18.

  Each camera 18 has an imaging optical system (not shown) and an imaging element (not shown), and is installed on the ceiling or wall toward the imaging area. Each camera 18 includes a memory 18a, a control unit 18b, and a communication unit (not shown). The control unit 18b performs a human detection process for detecting a person, a brightness detection process for detecting the brightness of an image, and a process for controlling communication with the controller 13 via the communication line L3. Therefore, for example, when it is determined that a person has been detected by image processing, the camera 18 generates a person detection signal indicating that a person has been detected, and transmits the person detection signal to the controller 13 via the communication line L3.

Furthermore, when the camera 18 receives the monitoring area information from the controller 13, the control unit 18b stores the setting information in the memory 18a and executes a human detection process based on the setting information.
As described above, the building management system 1 includes a plurality of devices 14, a plurality of gateway devices 12 that are control devices for controlling the plurality of devices 14, and a plurality of cameras 18. Each gateway device 12, a plurality of devices 14, and a plurality of cameras 18 constitute a control system connected by communication lines L2 and L3.

In the following description, a case will be described in which the camera 18 functions as a human sensor indicating whether or not there is a person in the set monitoring area.
As described above, the information of the monitoring area is stored in the memory 18a of the camera 18. Here, the monitoring area is a human detection area that detects the presence or absence of a person in the image acquired by the image sensor. is there. The memory 18a of the camera 18 may be a RAM or a non-volatile memory such as a flash memory. Therefore, the memory 18a stores one frame of image data obtained by imaging with the image sensor and information on the human detection area.

FIG. 2 is a diagram illustrating an example of a human detection region in an image.
Since each camera 18 is attached to various places in a building, various objects such as a desk in a living room are reflected in the acquired image. In FIG. 2, the image IMS obtained by the image sensor of the camera 18 includes a plurality of objects OB such as a desk in a building.

  For example, in a certain camera 18, a human detection area for detecting a person who does not include these objects OB is set as a monitoring area. In FIG. 2, three human detection areas R1, R2, and R3 indicated by dotted lines are set in an area that does not include two objects OB.

  The image processing circuit of the camera 18 performs image processing on the image obtained by the image sensor and executes human detection processing within the set human detection area.

  Each person detection area of each camera 18 can be set from the outside. For example, the administrator sets the person detection area in the image while viewing the image obtained by the camera 18 in the management apparatus 11. The information of the person detection area is transmitted from the management apparatus 11 to the camera 18 via the communication lines L1L2 and L3.

  Image data from each camera 18 is transmitted to the gateway device 12 and stored in the memory of the gateway device 12. Each camera 18 transmits image data via the communication line L3. A method for transmitting an image signal will be described later.

  The management device 11 can acquire the image data of each camera 18 by transmitting a transmission request command to the gateway device 12. The administrator can display the acquired image on the monitor and set the human detection area while viewing the displayed image.

Each camera 18 performs a human detection process in the set one or more human detection areas, and when a person is detected, transmits a human detection signal to the controller 13 via the communication line L3.
In other words, the management device 11 can set a monitoring area in the image data of each camera 18 acquired from the gateway device 12, and the management device 11 can transmit information on the set monitoring area to each camera 18. Each camera 18 executes predetermined image processing based on the received monitoring area information.

  In the case of FIG. 2, information indicating the positions and ranges of the three human detection areas R1, R2, and R3 is set by the management apparatus 11 and transmitted to the camera 18 via the communication lines L1, L2, and L3, and the memory 18a. Stored in

  Each camera 18 performs human detection processing on the images in the three human detection areas R1, R2, and R3 in the image based on the information on the human detection areas stored in the memory 18a.

FIG. 3 is a block diagram showing the configuration of the gateway device 12.
The gateway device 12 includes a control unit 21, a communication interface (hereinafter abbreviated as communication I / F) 22, and a communication I / F 23.

  The control unit 21 includes a processor 24 and a storage device 25. The communication I / F 22 is an interface circuit with the communication line L1. The communication I / F 23 is an interface circuit with the communication line L2.

The processor 24 includes a central processing unit (hereinafter referred to as CPU) 24a and a memory 24b such as a ROM and a RAM. Various functions of the gateway device 12 are realized by the CPU executing a program stored in the ROM.
The processor 24 may be configured by an integrated circuit such as an FPGA (Field Programmable Gate Array).

The storage device 25 is a rewritable nonvolatile memory such as a flash memory or a hard disk device.
The storage device 25 stores various control programs and control schedule data, and also stores image data from each camera 18.
Further, the storage device 25 also stores information on the number of cameras 18 connected to the controller 13.

As described above, the gateway device 12 executes the control program according to the command signal from the management device 11 and transmits the command signal to the controller 13 according to the schedule according to the instruction from the management device 11. 14 operations are controlled to perform building control such as lighting control.
(Function)
Next, a process in which the management device 11 and the gateway device 12 acquire image data of each camera 18 will be described.

  As described above, the building control is performed according to the arrangement position of each device 14 arranged in the building. For example, the controller 13 performs illumination control based on a human detection signal from the camera 18 so as to illuminate a space in which a human is detected.

  However, for example, the administrator of the management apparatus 11 may want to set or change the human detection area of each camera 18. In such a case, the administrator displays the image of the camera 18 whose human detection area is to be changed on the monitor of the management apparatus 11 and sets the human detection area as shown in FIG.

  If the administrator displays an image captured by each camera 18 on the monitor of the management apparatus 11, the management apparatus 11 transmits an image transmission request to the camera 18, and the camera 18 transmits the image data. When the image data is transmitted to the management apparatus 11, the amount of image data is large, so that the communication between the controller 13 and each device 14 on the communication line L3 is affected, the output timing of the control command signal and the like is delayed, and the lighting control is appropriate. Will not be done.

Therefore, in the present embodiment, the gateway device 12 acquires the image data of each camera 18 by the method described below.
FIG. 4 is a flowchart illustrating an example of the flow of image acquisition processing in the gateway device 12. The processing of FIG. 4 is executed by the processor 24 of the gateway device 12.

  When the administrator gives a predetermined command input to the management apparatus 11, the management apparatus 11 transmits an image acquisition command signal CIPC for executing image acquisition processing to all gateway apparatuses 12.

Upon receiving the image acquisition command signal CIPC from the management apparatus 11, each gateway apparatus 12 transmits the image acquisition command signal CIPC to all the cameras 18 via the controller 13 (step (hereinafter abbreviated as S) 1).
That is, the processing of S1 by the processor 24 constitutes an image acquisition command transmission unit that transmits the image acquisition command signal CIPC to the plurality of cameras 18 via the communication lines L2 and L3.

  Here, the image acquisition command signal CIPC from the management apparatus 11 is transmitted as a global signal to all the gateway apparatuses 12 via the communication line L1. Each gateway device 12 transfers the received image acquisition command signal CIPC to the controller 13. Therefore, each gateway device 12 transmits the image acquisition command CIPC to the plurality of cameras 18 at the same time.

  Here, the management apparatus 11 transmits the image acquisition command signal CIPC for acquiring an image as a global signal to all the cameras 18 in the building. However, the administrator wants to acquire the image 1 or Two or more cameras 18 may be designated, and the image acquisition command signal CIPC may be transmitted to only the designated one or two or more cameras 18 via the gateway device 12.

  Furthermore, the management apparatus 11 may transmit the image acquisition command signal CIPC in a predetermined order instead of simultaneously transmitting to the plurality of gateway apparatuses 12.

  Upon receiving the image acquisition command signal CIPC from the gateway device 12, the controller 13 transfers the image acquisition command IPC to each camera 18 connected to the communication line L3.

  FIG. 5 is a flowchart of the operation of the camera 18 that has received the image acquisition command IPC. The process of FIG. 5 is executed by the control unit 18b of the camera 18.

  Upon receiving the image acquisition command IPC, each camera 18 drives the image sensor and stores an image of one frame in the memory 18a of the camera 18 (S11). That is, the control unit 18b is provided in each camera 18, and when receiving an image acquisition command CIPC, the control unit 18b acquires an image by the image sensor and configures an image acquisition unit that stores the acquired image data in the memory 18a. One frame of image data is stored in the memory 18a.

  That is, when receiving the image acquisition command IPC, the camera 18 stores the image at the time of reception in the memory 18a. Therefore, all the cameras 18 in the building management system 1 acquire images almost simultaneously and store them in the memory 18 a of each camera 18.

  In other words, each camera 18 temporarily buffers the image when the image acquisition command IPC is received in the memory 18a. As will be described later, each camera 18 transmits the image data line by line in response to a transmission request for image data from the gateway device 12.

  Returning to FIG. 4, the gateway device 12 determines whether image data of all the cameras 18 has been acquired (S2). Initially, since no image data of any camera 18 is acquired, the determination in S2 is NO.

  Here, in the process of FIG. 4, the gateway device 12 executes the process of S2 or less immediately after the process of S1, but the process of S2 or less is performed at another timing, for example, on another day or It may be executed at a predetermined time.

As described above, since the gateway apparatus 12 has information on the number of cameras 18 connected to the controller 13, for example, in S2, when four cameras 18 are connected to the communication line L3, It is determined whether all image data of the four cameras 18 have been acquired.
When the image data of all the cameras 18 has not been acquired (S2: NO), the gateway device 12 determines the camera 18 from which the image data is acquired (S3). When the image data of the four cameras 18 is not acquired at all, the first camera 18 that first acquires the image data is determined as the camera that acquires the image data.

  The gateway device 12 determines whether image data of all lines of the image of the camera 18 determined in S3 has been acquired (S4).

  When the image data of all lines of the first camera 18 has not been acquired (S4: NO), the gateway device 12 sends a transmission request command RC for requesting transmission of image data for one line as partial image data. The data is transmitted to the second camera 18 (S5). Here, the transmission request command RC is a command for requesting transmission of partial image data for one line of a frame image.

That is, the process of S5 constitutes a transmission request command transmission unit that transmits a transmission request command RC for requesting transmission of partial image data, which is a part of the image data acquired in each camera 18, to each camera 18.
Note that here, a transmission request for image data for one line is made as a part of an image of one frame, but a transmission request for image data for a plurality of lines such as two lines, three lines, etc. is made. Good.
Therefore, the transmission request command RC is a supply command for requesting transmission of partial image data by designating one or more lines in one frame.

  The camera 18 that has received the transmission request command RC in S5 transmits image data for one line. The gateway device 12 acquires image data for one line from the camera 18 (S6).

  The gateway device 12 counts up to which line the image data of each image of each camera 18 has been acquired. Therefore, when acquiring image data for the first time, the gateway device 12 sends a data transmission request command RC for the image data for one line of the first line of the frame image via the controller 13 to the first camera 18. Send to. The data transmission request command RC is a command for requesting transmission of image data of a specified line of the frame image.

  When several lines of image data have already been acquired, the gateway device 12 designates the line from which the image data is to be acquired next out of the unacquired lines, and transmits the image data of that line. A request command RC is transmitted to the first camera 18.

  Normally, image data is acquired sequentially from the first line of the image. Specifically, if m is an integer and the frame image is an m-line image, the gateway device 12 obtains m = 1 in order from the first line to the m-th line.

FIG. 6 is a flowchart showing an example of the flow of image data transmission processing in the camera 18.
The control unit 18b of the camera 18 determines whether the data transmission request command RC has been received (S21). When the data transmission request command RC is received (S21: YES), the control unit 18b transmits the image data of the line designated in the data transmission request command RC to the gateway device 12 (S22).
That is, the process of S22 is provided in each of the plurality of cameras 18, and transmits the partial image data of the image data stored in the memory 18a to the gateway device 12 as the control device in response to the data transmission request command RC. An image data transmission unit is configured.

  If the data transmission request command RC is not received (S21: NO), the control unit 18b performs no processing.

Therefore, the gateway device 12 repeats the process of S5 in FIG. 4 until image data for one frame is acquired from the first camera 18. When the image data of all lines of one frame is acquired from the first camera 18 (S4: YES), the gateway device 12 stores the image data of the first camera 18 in the storage device 25 (S7).
That is, in the process of S5, transmission of partial image data is requested for each camera 18 until all of the image data of each camera 18 is acquired.

  After S7, the process returns to S2, and if the gateway device 12 has not acquired the image data of all the cameras 18 (S2: NO), the camera 18 from which image data is acquired next is determined (S3). , S5 to S6 are executed.

  For the second camera 18, processing is executed in the same manner as the first camera 18. When image data of all lines is acquired from the second camera 18 (S4: YES), the process proceeds to the process of S7, and thereafter, the above-described process is repeated to acquire image data from all the cameras 18. Until this is done, the processing from S3 to S7 is executed.

  When the image data is acquired from all the cameras 18 (S2: YES), the gateway device 12 ends the process.

  That is, the gateway device 12 individually acquires the frame images for each line from the first camera 18 and, after completing the acquisition of the image data for all the lines, individually acquires the image data for each line from the second camera 18. To get to. When the image data of all the lines of the frame image has been acquired from the second camera 18, the image data is acquired individually for each line from the third camera 18. When the image data of all the lines of the frame image has been acquired from the third camera 18, the image data is acquired individually for each line from the fourth camera 18.

  As a result, when the four cameras 18 are connected to the controller 13 via the communication line L3, the gateway device 12 acquires the image data of the four cameras 18 and stores it in the storage device 25.

  Since the image data is sent for each line, the image data is transmitted from the camera 18 to the gateway device 12 during the gap of the transmission / reception period of the control signal to each device 14. As a result, transmission of image data is performed without affecting the control of the device.

  Therefore, even when the controller 13 is performing illumination control while communicating with a plurality of devices 14, the camera 18 transmits only image data for one line. Transmission and reception of detection signals and the like are not blocked for a long time.

  In the process of FIG. 4 described above, the gateway device 12 acquires the image data of the frame image for each camera 18, and after all the image data of one camera 18 is acquired, the image data is not acquired next. The frame device 12 acquires the image data of the frame image from the first camera 18, but the gateway device 12 first acquires the image data of the first line from all the cameras 18, and then the image data of the next line from all the cameras 18. The image data for each line may be acquired from all the cameras 18 in order. That is, the gateway device 12 may acquire image data little by little from all the cameras 18.

  Furthermore, as described above, the gateway device 12 acquires image data for each line from each camera 18, but acquires image data for two lines or image data for three or more lines from each camera 18. You may do it.

  In the above-described example, the gateway device 12 transmits the image acquisition command CIPC and the data transmission request command RC of the partial image data, and stores the frame image of each camera 18 in the storage device 25. The controller 13 may transmit the image acquisition command CIPC and the partial image data transmission request command RC, and store the frame image of each camera 18 in a storage device (not shown) of the controller 13.

  As described above, according to the above-described embodiment, a control system and a control apparatus that can transmit and receive image data of a camera connected to the same communication line as other devices without affecting the control of other devices. In addition, a method for transmitting image data can be provided.

  In particular, the image data of each camera 18 is stored in the gateway device 12. That is, each gateway device 12 functions as a buffer device for image data of a plurality of cameras 18. Therefore, once the gateway device 12 acquires the image data of each camera 18, when the management device 11 subsequently needs the image data of each camera 18, the management device 11 connects the communication line L 1 from the gateway device 12. Image data can be quickly acquired. That is, the gateway device 12 can immediately transmit the image data stored in the storage device 25 to the management device 11 without acquiring the image data from each camera 18 in response to the transmission request for the image data from the management device 11. .

  Further, in the above-described embodiment, the gateway device 12 transmits an image acquisition command CIPC to each camera 18 so that all the cameras 18 acquire images simultaneously. Therefore, the image data of each camera 18 is an image acquired simultaneously at a certain time, and the administrator can cause the gateway device 12 to record the image data of the image acquired simultaneously.

  Furthermore, when a part of the image data is missing, the gateway apparatus 12 transmits a data transmission request command signal for transmitting only the missing line to the camera 18, thereby completing one frame of complete image data. Can be stored in the storage device 25.

  In addition, although embodiment mentioned above demonstrated the building management system 1 as an example of a control system, it is applicable also to control systems other than building management.

  Furthermore, in the embodiment described above, the camera 18 has a human detection function, but may have other functions.

  Although several embodiments of the present invention have been described, these embodiments are illustrated by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Building management system, 11 Management apparatus, 12 Gateway apparatus, 13 Controller, 14 Apparatus, 15 Lighting fixture, 16 Illuminance sensor, 17 Wall switch, 18 Camera, 18a Memory, 18b Control part, 21 Control part, 22, 23 Communication interface , 24 processor, 24a central processing unit, 24b memory, 25 storage device.

Claims (8)

A control system in which the plurality of devices, a control device that controls the plurality of devices, and a camera are connected by a communication line,
An image acquisition command transmitter for transmitting an image acquisition command to the camera via the communication line;
An image acquisition unit that is provided in the camera, receives the image acquisition command, acquires an image, and stores the acquired image data in a memory;
A transmission request command transmission unit that transmits a transmission request command for requesting transmission of partial image data that is part of the image data acquired by the camera to the camera;
An image data transmission unit that is provided in the camera and transmits the partial image data of the image data stored in the memory to the control device in response to the transmission request command;
Having a control system. A plurality of the cameras are connected to the communication line;
The control system according to claim 1, wherein the control device transmits the image acquisition command simultaneously to the plurality of cameras. The image acquisition unit stores one frame of image data as the acquired image data in the memory,
The control system according to claim 1, wherein the transmission request command is a supply command for requesting transmission of the partial image data by designating one or more lines in the one frame.   The control system according to claim 1, wherein each of the plurality of devices is a lighting fixture. A plurality of the cameras are connected to the communication line;
The control system according to claim 1, wherein the transmission request command transmission unit requests each camera to transmit the partial image data until all of the image data of each camera is acquired. A management device capable of communicating with the control device;
Each of the plurality of devices is a lighting fixture,
The management device can set a monitoring area in the image data of the camera acquired from the control device, and can transmit information of the set monitoring area to the camera,
The control system according to claim 1, wherein the camera executes predetermined image processing based on the received information on the monitoring area. A control device that is connected to a plurality of devices and a camera via a communication line and controls the plurality of devices,
An image acquisition command transmitter for transmitting an image acquisition command to the camera via the communication line;
A transmission request command transmission unit that transmits a transmission request command for requesting transmission of partial image data that is a part of image data acquired by the camera to the camera;
Control device. A method of transmitting image data in a control system in which the plurality of devices, a control device that controls the plurality of devices, and a camera are connected by a communication line,
Send an image acquisition command to the camera via the communication line,
When the camera receives the image acquisition command, the camera acquires an image, stores the acquired image data in a memory,
A transmission request command for requesting transmission of partial image data that is a part of the image data acquired in the camera is transmitted to the camera;
The camera transmits the partial image data of the image data stored in the memory to the control device in response to the transmission request command.
A method for transmitting image data in a control system.

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