JPH09307877A - Image transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the monitor efficiency by providing the image information transmission system in which large capacity data such as image data on the occurrence of an accident are properly acquired without intervention of operation of a supervisor. SOLUTION: The image transmission system is provided with a 2-way transmission system making communication of symbol information and an image transmission request to a central station and with an image transmission system 8 to send image information on the occurrence of an important event or on request of an image, a video image of a site station is sent by selecting an image with an image transmission switch 14 only on request from the center station and the image transmission system 8 sends only an image by 1ch. Thus, no multiplexer is required, deterioration in an image is less, and even when a site station is in failure, deterioration in the image is less. A plurality of site stations are grouped into one group and a private channel is tied to the central station from one group to build up the system as a bus type, the installation cost for private lines having been installed from each site station to the center station is reduced and a communication load is relieved and the entire system is built up inexpensively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a discriminating function by image processing in a surveillance system for transmitting images of surveillance cameras arranged in a plant or on the road side to the center to improve the efficiency of surveillance in the center. And a system suitable for reducing the equipment cost.

[0002]

2. Description of the Related Art An example of an information transmission system including a conventional image processing system is shown in FIGS. FIG. 9 shows a conceptual diagram of the configuration of a conventional information transmission system.
The detailed configuration will be described below.

FIG. 9 shows a conventional star-type structural information transmission system. In FIG. 9, in order to monitor the sites of n points distributed over a wide area, the sites of the n points are grouped, and the images of each site are transmitted to the central station.
>> m, for example, n = 10, m = 1) monitors were installed, and the situation of each site was monitored by changeover switches.

As a background to such a star type structure, as another method of realization, in a bus type structure for analog image transmission, each field station has a configuration as shown in FIG. There is a means for receiving and reproducing the data of, the data of its own station is added to the data, and then transmitting and reproducing the data to the other adjacent terminal station.
Since the reception / transmission is repeated for each relay station, the image is deteriorated, and in practical use, the maximum limit is to transmit the image to the terminal station of about 10 stages. The same can be said for optical communication and electrical signal communication.

In digital image transmission, when a photographed image is converted into a digital image, it is 150 Mbp without compression.
s, a transmission system of about 30 Mbps is practically required at the time of compression. If this is transmitted in a 10-stage bus type structure, a digital image 30 Mbps / channel × 10 (units) = 300
The actual capacity of Mbps is required, and when multiplexing is performed by time division transmission, a free capacity between transmission packets is required, so that a transmission system of several Gbps is required, resulting in a huge cost.

Further, the problem of relay reproduction common to analog / digital transmission systems is that when a failure occurs at a certain terminal station,
It means that all the upstream side will not function. That is, in multistage relay, the MTBF (mean time between failures) of the system
Will be deteriorated. Due to the above-mentioned problems, the star structure has been adopted in the prior art.

FIG. 10 shows an example in which an optical fiber is applied to a transmission line in traffic flow measurement. The configuration will be described. First, in the field station, the ITV camera 1 captures the road condition of the site, and the image is distributed as an input to the image processing device 2 and the multiplexing device 12. The image processing device 2 performs image processing such as histogram and contour extraction processing and binarized image processing to extract the measurement object from the input image, and symbolizes information such as the number of vehicles on the road, speed, and vehicle type. To the information processing device 9 of the central station. Thereafter, the coded information and the previously distributed video are combined into a multiplexed signal by the multiplexing device 12 (for example, in the case of frequency multiplexing, the carrier wave of the TV signal is shifted and superimposed), and then the multiplexed signal is generated by the photoelectric converter 4. To the transmission circuit of the photoelectric converter, and the output of the transmission circuit is L
It is converted into an optical signal by using a light emitting element such as ED and transmitted to the central office by an optical fiber communication means including a high speed transmission system 8, an optical amplifier 6 and the like.

On the other hand, on the optical signal receiving side, an optical signal transmitted by the optical fiber communication means is received by a light receiving element such as a PD (photodiode), the output thereof is input to a receiving circuit, and an electrical signal (multiplexed signal) is received. ).

Further, in optical communication, the transmission distance of the optical fiber and the capability of the optical transceiver are taken into consideration. That is, when the loss of the optical fiber (quartz fiber) is 1 dB / km, the emission level of the optical transmitter is -10 dBm, and the minimum reception level of the optical receiver is -30 dBm, the maximum transmission distance is determined to be 20 km. Under this condition, when performing 30 km transmission, a suitable optical amplifier 6 for correcting the difference in optical loss is inserted into the high-speed transmission system 8 of the optical fiber.

Next, the central station reconverts the optical signal from the above-mentioned field station into an electric signal by the photoelectric converter 4. Further, the image / data distribution device 11 distributes the image and the symbolized information, the image is output to the monitor 10 while switching the timer for each site, and the symbolized information is output to the information processing device 9 to show the state as a scene road condition. The display device 15 is displayed and the user is serviced.

[0011]

The above conventional method has the following problems. (1) Since the number of dedicated lines for image transmission from each field station is enormous, the cost of the off-premise extension work is increased. (2) Since the number of monitors required for monitoring each site and dedicated lines for the number of sites are concentrated, the size of the monitoring room is increased and the cost of equipment is increased. (3) Since many on-site images are constantly monitored, the burden on the monitor such as monitor monitoring and image switching operation is large, resulting in erroneous determination and delay in determination. (4) Due to the problem of (3), the timeliness of information is impaired and the monitoring accuracy is deteriorated.

The object of the present invention is to solve the above-mentioned problems, and not only normal data, but also large-capacity data such as images when necessary such as when an unexpected event occurs intervenes the work of the surveillance staff. It is intended to improve the surveillance system by providing an information transmission system that can be properly acquired without the need. Another object of the present invention is to provide an information transmission system that can reduce the cost by reducing the number of transmission lines that perform image transmission.

[0013]

The above object of the present invention is achieved by the following constitution. That is, in an image transmission system in which a plurality of field stations (terminal stations) composed of an image capturing device and a transmission device are distributed in a wide area and the image information is transmitted to a central station, an input image is processed and Equipped with an image processing device that extracts, understands, and symbolizes image features,
The central station is equipped with a logic function to transmit the symbolized information to the central station using a bidirectional transmission system, and an abnormality determination device that determines the occurrence of a serious event based on the content of the symbolized information at each field station. In addition, an image information transmission system that separately transmits image information of each field station to the central station is provided, and it is determined by the abnormality determination device of the central station that a serious event has occurred based on the content of the symbolized information at each field station. By the automatic switching operation of the abnormality determination device or the operation of the operator of the central station, the selection signal of the field station to be image-transmitted using the bidirectional transmission system is transmitted to the field station and received. An image transmission system having a logical function of transmitting image information of a selected field station to a central station by an image information transmission system.

The present invention, as described above, is bidirectional / image 2
A transmission system is logically provided, and bidirectional transmission system is used for symbolized information such as speed. For example, time-division multiplex transmission is used, and images are transmitted to only one field station in the group in the center by judgment based on symbols. It is a thing. In addition, in the case of multiplexing an image by light, it is necessary to return it to an electric signal once and then superimpose it as an electric signal. According to the present invention, since only the optical signal of the selected field station is passed, the superimposing device is unnecessary.

In the image transmission system of the present invention, each field station is provided with a ring buffer type storage device capable of storing moving image data for a fixed time, and a bidirectional transmission system is used to select an image transmission signal for the field station. A mechanism for centrally transmitting the stored data of the selected field station can be provided.

In this way, a moving image buffer is provided in the field station so that the central station can confirm the image contents up to the encoding.
The image can be transmitted retrospectively to the central office.

In the image transmission system of the present invention, the storage update stop of the ring buffer type storage device of the selected field station is performed by the command of the judging device based on the symbolized information of the image processing device of the field station. The system can be built.

This system considers the delay of the transmission system,
The update of moving image data is stopped when the field station judges that a serious event has occurred. In the image transmission system of the present invention, the on-site station is composed of a plurality of on-site stations and a central slave station which is a central station of the plurality of on-site stations. There is a central master station that is divided into groups that are connected to the image information transmission system that is constructed in a bus type consisting of lines, and that transmits the information of the central slave station of each group. The master station can be configured to be connected by a bidirectional transmission system and a bus-type image information transmission system composed of one dedicated line.

In this way, the central master station connected to the central slave station of each group collectively manages the status of each group, constantly monitors each group, and when an unexpected event occurs, a control signal is sent to the corresponding group and site. You can call by line and monitor the situation of the occurrence site with video, and each group is built as an independent intelligent information collection system,
The central parent station is positioned as an editing room, and it is possible to build an information gathering system that covers a wide area and reduce the burden on the central parent station monitor.

The above object of the present invention can be achieved by the following constitution. That is, in an image transmission system in which a plurality of field stations composed of an image capturing device and a transmission device are distributed in a wide area and the image information is transmitted in the center, an input image is processed, and image features are extracted from the processed image. An image processing device that understands and encodes, and an abnormality determination device that determines the presence or absence of a serious event based on the encoded information along with a logical function of transmitting the encoded information to a central station by using a bidirectional transmission system. Each of the field stations is equipped with an image information transmission system for separately transmitting the image information of each field station to the central station,
When the abnormality determination device of each of the field stations determines that a serious event has occurred, a selection signal indicating that the field station that selects and executes image transmission from the field station is its own field station is transmitted to the central station by using the bidirectional transmission system. The image information of the selected field station is output to the image information transmission system, and the central station switches the image to the image information transmission site station by the received selection signal and displays it on the central station. The image transmission system is characterized in that In the case of the present invention, since the information is symbolized at each field station, not only the determination at the central station but also each field station itself can make an abnormality determination based on the degree of urgency.

Even when each site station is provided with an abnormality determination device, each site station can store moving image data for a certain period of time.
A ring buffer type storage device is provided, and a mechanism for transmitting the stored data of the selected field station to the center by the selection signal of the field station to be image-transmitted by the bidirectional transmission system is provided, or of the selected field station. A mechanism for performing storage update stop of the ring buffer type storage device by a command of the determination device based on the symbolization information of the image processing device of the field station, or the field station is composed of a plurality of field stations and the field sites It consists of a central slave station that is the central station of the station, and each field station and the central slave station are divided into groups that are connected by a bidirectional transmission system and a bus type image information transmission system consisting of one dedicated line. The central slave station of the group may be connected to the central master station by a bidirectional transmission system and an image information transmission system constructed in the form of a bus consisting of one dedicated line.

In the present invention, the bidirectional transmission system for communicating the symbol information and the image transmission request to the central office and the image transmission system for transmitting the image information when a serious event occurs or when the image request is made are provided. , A dedicated line that has been drawn from the field station to the central station, for example, by grouping a plurality of field stations into one group and constructing a dedicated line from that group to the central station as a bus type dedicated line The facility cost and communication load can be reduced, and the entire device can be constructed at low cost.

In other words, according to the present invention, in the information transmission system, the bidirectional transmission system for communicating the symbol information of the field station and the image transmission request of the central station and the image transmission for transmitting the image according to the request from the central station. Instead of collecting images in a star shape and performing selection / switching operations in the center, a bidirectional transmission system connected to the site is used for selection / switching operations, and the image transmission path has a bus-type structure, so that the transmission system By reducing the facility cost and reducing the communication load and the deterioration of communication quality, it is possible to provide accurate information when the user requests it without impairing the timeliness of data.

Further, in the conventional bus type structure, the image multiplex transmission is performed by the multistage relay reproduction, but in the present invention, the image of the scene is transmitted by switching the image by the image transmission switch only at the request from the central side, Since only one channel of image is transmitted to the image transmission path, no multiplexer is required. Further, although the configuration of the present invention is a bus type structure and has multiple stages,
Rather than relay playback, the on-site station requested by the central station goes to pour the image into the image transmission line connected to one central station, so there is little deterioration of the image, and even if one terminal station fails, the image The system will function if the image transmission path is normal even if a certain terminal station fails, and reliability equivalent to that of the star structure of the prior art can be obtained. Further, according to the present invention, the image information is transmitted to the central station in the event of an emergency or when an image is requested. Therefore, the burden on the supervisor is reduced, and the data can be obtained in a timely manner, so that the surveillance accuracy can be improved.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows an overall apparatus configuration including a field station and a central station in traffic flow measurement which is an embodiment of the present invention.

The traffic flow measuring apparatus shown in FIG. 1 is capable of outputting the ITV camera 1 capable of capturing the road condition at the scene, and the image processing capable of outputting the vehicle speed, the number of vehicles passing, the vehicle type, etc. as symbolized information from the image captured by the ITV camera 1. The device 2, the ring buffer type video memory 3 capable of storing the image picked up by the ITV camera 1 for T minutes, the photoelectric converter 4 capable of converting the image data of the video memory 3 into an optical signal, and the photoelectric transmission for the image transmission system for image transmission. An optical multiplexer 5 for inputting image data converted into an optical signal by the converter 4, and an optical amplifier 6 for obtaining a suitable optical signal level in consideration of the distance between the field station and the central station and the capability of the optical transceiver. Is provided in the field station. And
The field station and the central station are connected by a public line 7 which is a data transmission system for transmitting the symbolized information output from the image processing apparatus 2 and an optical fiber transmission line 8 which is an image transmission system for transmitting video data. Has been done. Then, the central station performs individual / statistical processing of the symbol information of the field road transmitted from the field station, converts it into display information which is the field road condition, and generates an unexpected event from the abnormality determination device 13 (described later). When the notification is received, the switching signal for outputting the image transmission request of either the real-time image or the image stored in the memory to the field station and outputting the image of each site for a certain period of time to each site terminal station under normal conditions. An information processing device 9 that outputs the information, a monitor 10 that can output the situation of the on-site road transmitted from the on-site station, and the like are provided.

On the monitor 10, in normal times, the image of each site can be sequentially switched and displayed in real time at regular time intervals by the image transmission switch 14 that has received the switching signal output from the information processing device 9. When an unexpected event occurs, the image transmission switch 14 is switched by the image transmission request from the information processing device 9, the timer switching is stopped, and the video of the occurrence site is displayed.

Further, in the configuration shown in FIG. 1, the information processing device 9 judges the accidental event (accident, broken vehicle, traffic jam, etc.) of the road condition on the site from the symbolized information output from the image processing device 2 of the field station. Abnormality determination device 13 for notifying the occurrence of a sudden event to
An image transfer switch 14 for outputting a command to transmit a video selected from an image transmission command output from the information processing device 9 to the central station, and a status display for displaying each field condition statistically processed by the information processing device 9. The device 15 and the control signal system 16 for communicating the image transmission request and the image switching signal are also provided in the traffic flow measuring device. The data transmission system 7 and the control signal system 16 are combined to form a bidirectional transmission system.

A case where the above configuration is applied to a traffic flow measuring system installed on an expressway will be described. here,
The ITV camera 1 is installed at a position where a vehicle traveling on a road can be photographed from above the side surface at a field station. The road surface image captured by the ITV camera 1 is input to the image processing device 2, and the traveling speed, the number of vehicles, the vehicle type, etc. of the traveling vehicle are measured therein. The symbolized information and field station ID measured by the image processing apparatus 2 are transmitted to the information processing apparatus 9 and the abnormality determining apparatus 13 of the central station using the public (telephone) line which is the data transmission system 7.

The information processing device 9 performs statistical processing and status processing on the symbolized information transmitted through the public line. Further, when it is estimated that the abnormality determination device 13 has caused a sudden event (accident, traffic jam, etc.), the abnormality determination device 13 automatically transmits the image transmission switch of the site through the information processing device 9 based on the site station ID. The image transmission command is transmitted to 14 through the public line. Upon receiving the image transmission command, the image transmission switch 14 stops the operation of the video memory 3 of the ring buffer type at that moment, and outputs the image of the road on the scene for a certain time accumulated in the video memory 3.

In the present invention, since the image transmission switch 14 is provided on the field station side as described above, the changeover switch is not required on the central side as in the prior art, and therefore the image transmission path also transmits the image of one channel. It suffices to have a capacity (at least about 6 MHZ) that can be used, and there is no need to multiplex image signals, so that device configuration costs and image deterioration can be reduced. Since the image transmission system transmits an image only when a transmission request is made from the central side, only one channel of image transmission is always performed.

The image signal transmitted from the memory 3 is converted from an electric signal to an optical signal by the photoelectric converter 4,
Using the optical multiplexer 5 that matches the signal that passes through the other fiber to the one fiber that is being used for optical communication, send it to the central station through a dedicated line (optical fiber: high-speed transmission system 8) that is a high-speed transmission system. To be done. At this time, since optical communication is performed, the optical amplifier 6 is inserted into the high-speed transmission system 8 in consideration of the transmission distance of the optical fiber and the coupling loss of the optical multiplexer 5, and Ensure quality.

The ring buffer type video memory 3 accumulates not only after the occurrence of the unexpected event but also from the time before the occurrence of the unexpected event to the time of occurrence in the information processing device 9 as an image, thereby reducing the burden on the central office supervisor. It enables the analysis of unexpected events.

The status display device 15 constantly displays the average speed, traffic flow, and trend of the situation on the whole schematic diagram such as a wide area monitoring map.

2, 3 and 4 show functional flowcharts of the present invention. In FIG. 2, a functional flow on the side of the field station will be described. In the field station, the ITV camera 1 shown in FIG. 1 captures an image of the field. The image data is input in parallel to the image processing device 2 and the ring buffer type image memory 3 in FIG.

In the image processing apparatus 2, after inputting an image, image processing is performed to measure symbolized information such as the number of vehicles, their traveling speeds and vehicle types. After that, the symbolized information is transmitted by data communication to the central information processing device 9 and the abnormality determination device 13 on the public line (low-speed transmission system 7 in FIG. 1).

On the other hand, the ring buffer type image memory 3 sequentially stores the images in the ring buffer type image memory 3 if the occurrence of a sudden event is not notified from the center side, and sends a transmission request for image switching from the center side. When the signal is received by the transmission switch 14, the photoelectric converter 4 converts the signal into electric light, and the optical multiplexer 5 puts the signal on the optical fiber (high speed transmission system 8) to perform optical communication. The image is output to.

Next, when the occurrence of a sudden event is notified, the ring buffer type image memory 3 stops storing, and
Image output is switched from the center side depending on whether a real-time image or a memory-stored image is requested.

When there is a request for a real-time image, real-time image data is converted into a light signal by the photoelectric converter 4 for optical communication, and optical communication is performed. The past data is taken out from 3, and the same processing as that when the occurrence of the unexpected event is not notified to the central side is transmitted.

The functional flow of information processing on the central office side will be described with reference to FIG. On the central side, the incoming of the symbolized information transmitted through the public line is monitored by the low-speed transmission system monitoring. Here, if there is no coded information, continue monitoring,
When the arrival of the encoded information is confirmed, the field station ID of the encoded information is confirmed, and the encoded information is input to the information processing device 9 and the abnormality determination device 13 in parallel.

In the information processing device 9, statistical processing is performed from the input symbolized information to determine the average speed and traffic flow condition, and the status display device 15 displays the road condition on site as shown in FIG. Or display it as a graph.

On the other hand, the abnormality determination device 13 determines the occurrence of a sudden event such as an accident from the symbolized information, and inputs the result to the information processing device 9.

Next, in the information processing device 9, when the occurrence of a sudden event is notified from the abnormality determining device 13, the spot event occurrence site ID is confirmed and an image transmission request is transmitted to the site station. At this time, the image transmission request also includes a memory accumulation image / real-time image selection signal. The above selection is made by the monitoring staff, and if nothing is selected, either the memory accumulated image or the real-time image is selected in advance.

The central monitor display control flow in FIG. 4 will be described. The monitor 10 on the center side displays the image on the site side, but in this system, in normal times, the images captured by each site station are sequentially displayed by switching the timer, and when the unexpected event occurs, the image of the site station is displayed.

According to the flow shown in FIG. 4, first, the site counter i is set to 0 (zero), the presence or absence of the image transmission request at the time of the occurrence of the unexpected event is checked, and if there is no image transmission request,
The image of the site station corresponding to the site counter i is output. After that, when a certain period of time elapses with the timer, the on-site counter is counted up and the next on-site station is moved to. Next, when there is a request for image transmission at the time of the occurrence of a sudden event, the field counter is stopped, the image of the field station is selected as the memory accumulated image or the real-time image, and the field image is output.

The transmission system of the present invention has a bus type structure as shown in FIG. 5 instead of the conventional star type structure shown in FIGS. 9 and 10, and a plurality of n stations are provided on one bus. Field stations can be connected.

Further, in the embodiment of the present invention, the traffic flow measurement is described. However, the present invention is to monitor the premises (buildings, factories, etc.).
It is also applicable to a large-scale network that can monitor all of these from a small-scale network.

Other embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 6 shows an overall device configuration in traffic flow measurement which is another embodiment of the present invention. The embodiment shown in FIG. 6 has substantially the same contents as the embodiment shown in FIG. 1, but in the embodiment shown in FIG. 1, the abnormality determination device 13 is installed in the central office, whereas the embodiment shown in FIG. In the example, the abnormality determination device 13 is installed in the on-site station, the symbolized information which is the output from the image processing device 2 in the on-site station is input, and after the abnormality determination is performed, if an unexpected event occurs, image transmission is performed. This is an example of a configuration in which a command is output to the image transmission switch 14. That is, in this embodiment, by omitting the procedure of temporarily passing the coded information obtained at the field station through the central station, and making the field station intelligent, the burden on the central station is reduced and the embodiment of FIG. The function equivalent to the case can be realized.

In the above-mentioned two embodiments of the present invention, the traffic flow measurement is described. However, the present invention is a large network in which a small network for premises monitoring such as buildings and factories can collectively monitor these. It is also applicable to a wide range of systems including large scale networks.

Next, a third embodiment of the present invention will be specifically described with reference to the drawings. The embodiment shown in FIG. 7 shows the overall configuration in wide area hierarchical traffic flow measurement. The wide area hierarchical traffic flow measuring system of FIG. 7 is the same as the embodiment shown in FIG.
The configuration of the embodiment shown in FIG. 6 is summarized as one group. At this time, the central station that summarizes the data at each site of each group k is the central slave station. The group k with the central slave station as a core includes a central master station in an upper layer and a high-speed transmission system (optical fiber) for image transmission, a low-speed transmission system for symbolized data transmission (public line), and an image transmission command transmission. Connect with the control signal line (do not care about low speed and high speed).

As shown in FIG. 7, each group 1, 2, 3,
..., the central master station connected to k is each group 1, 2,
The situation of 3, ..., k is collectively managed, and each group 1, 2, 3, ..., k is constantly monitored, and when an unexpected event occurs, the corresponding group and site are called by the control signal line. , You can monitor the situation of the occurrence site with video.

That is, the central master station is
Since 3, ..., k are established as independent intelligent information gathering system, they are positioned as an editing room. Therefore, it is possible to construct an information gathering system covering a wide area and the burden on the observer of the central parent station. Can be reduced.

In the above-described embodiment of the present invention, the image transmission system and the data transmission system are logically composed of two transmission systems, but they are not physically two. That is, the present invention includes a method of superimposing data by changing the light wavelength on a physical image of a single-core fiber, and a method of inserting data into an empty image signal. The data transmission system is not particularly limited in topology. It may be a bus type with a dedicated line, a star type, or a public line or wireless.

[0054]

According to the present invention, in the information transmission system including the image processing system, the bidirectional transmission system is used for the symbolized information and the control signal, and the image transmission system is used for the image information to reduce the communication load. It can be reduced and the real-time property of information is not impaired. Moreover, since the information is constantly updated and the requested information can be acquired, it is possible to provide the user with accurate information on the spot. Further, by grouping a plurality of sites, the number of dedicated lines can be reduced, so that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention.

FIG. 2 is a functional flowchart of a field station device which is an embodiment of the present invention.

FIG. 3 is a functional flowchart of an information processing device on the central office side, which is an embodiment of the present invention.

FIG. 4 is a functional flowchart of a monitor display control device on the central office side which is an embodiment of the present invention.

FIG. 5 is a configuration diagram of a bus type transmission system according to an embodiment of the present invention.

FIG. 6 is an overall device configuration diagram in traffic flow measurement according to an embodiment of the present invention.

FIG. 7 is a configuration diagram of a tree-type structured wide area transmission system in wide area hierarchical traffic flow measurement according to an embodiment of the present invention.

FIG. 8 is an example of a display screen of the status display device according to the embodiment of the present invention.

FIG. 9 is an overall configuration diagram of a conventional technique.

FIG. 10 is a detailed configuration diagram of a conventional technique.

FIG. 11 is a configuration diagram of a transmission system having a bus type structure according to the related art.

[Explanation of symbols]

1 ITV camera 2 Image processing device 3 Ring buffer type video memory 4 Photoelectric converter 5 Optical multiplexer 6 Optical amplifier 7 Bidirectional transmission system (data transmission system) 8 Optical fiber transmission line 9 Information processing device 10 Monitor 13 Abnormality determination device 14 image transmission switch 15 status display device 16 bidirectional data transmission system (control signal system)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomohiro Arasawa 1-2-10 Isogo, Isogo-ku, Yokohama-shi, Kanagawa Babcock Hitachi Ltd. Yokohama Engineer Ring Center

Claims (8)

[Claims] 1. An image transmission system in which a plurality of field stations, each of which is composed of an image capturing device and a transmission device, are distributed in a wide area and which transmits the image information to a central station, processes an input image, and processes the image from the processed image. Equipped with an image processing device that extracts and understands features and encodes them, and has a logical function to transmit the encoded information to the central station using a bidirectional transmission system and the content of the encoded information at each field station. The central station is equipped with an abnormality determination device that determines the occurrence of a serious event based on the above, and an image information transmission system that separately transmits the image information of each field station to the central station is provided. If the abnormality determination device of the central station determines that a serious event has occurred, the image should be transmitted using the bidirectional transmission system by the automatic switching operation of the abnormality determination device or the operation of the operator of the central station. Field station Image transmission system comprising the logical function of transmitting a selection signal transmitted to the site station, the image information of the selected site station receives this by the image information transmission system to the central station. 2. A ring buffer type storage device capable of storing moving image data for a fixed time is provided in each field station, and a bidirectional transmission system is used to select a field station to be used for image transmission.
The image transmission system according to claim 1, further comprising a mechanism for centrally transmitting the stored data of the selected field station. 3. The storage updating of the ring buffer type storage device of the selected on-site station is stopped by a command of a determination device based on the symbolized information of the image processing device of the on-site station. The image transmission system described. 4. The on-site station comprises a plurality of on-site stations and a central slave station which is a central station of the plurality of on-site stations, and each on-site station and the central slave station comprises a bidirectional transmission system and one dedicated line. There is a central master station that is divided into groups that are connected by a bus-type image information transmission system and that transmits information of the central slave stations of each group. The image transmission system according to any one of claims 1 to 3, wherein the two-way transmission system is connected to a two-way transmission system and an image information transmission system constructed in a bus type including a single dedicated line. 5. An image transmission system in which a plurality of field stations composed of an image capturing device and a transmission device are distributed in a wide area and the image information is transmitted in the center, an input image is processed, and image characteristics are processed from the processed image. An image processing device that extracts, understands, and encodes the encoded information and a bidirectional transmission system of the encoded information, and determines the occurrence of a serious event based on the encoded information together with the logical function of transmitting the encoded information to the central office. An abnormality determination device is provided in each of the field stations, and an image information transmission system that separately transmits image information of each field station to the central station is provided, and when the abnormality determination device of each field station determines that a serious event has occurred, the The image signal of the selected on-site station is provided with a logical function of transmitting a selection signal to the central station by using the bidirectional transmission system, by selecting the on-site station to execute the image transmission from the on-site station. The image Output to broadcast transmission system, the selection signal received at the central station, an image transmission system and image switching to the image information originating site station, and wherein the displaying to the central station. 6. A ring buffer type storage device capable of storing moving image data for a fixed time is provided in each field station, and a bidirectional transmission system is used to select a field station to be image-transmitted.
The image transmission system according to claim 5, further comprising a mechanism for centrally transmitting the stored data of the selected field station. 7. The storage update stop of the ring buffer type storage device of the selected field station is performed by a command of a determination device based on symbolization information of the image processing device of the field station. The image transmission system described. 8. The on-site station comprises a plurality of on-site stations and a central slave station which is a central station of the plurality of on-site stations, and each on-site station and the central slave station comprises a bidirectional transmission system and one dedicated line. Image that is divided into groups connected to a bus type image information transmission system, and the central slave station of the group is a bus type image that consists of a bidirectional transmission system and one dedicated line with the central master station The information transmission system is connected to the information transmission system.
The image transmission system described.