JP2016184917A - Monitoring system and reproduction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data storage system which allows moving image data to be safely stored in a device connected to a network and to be safely used, by solving a problem in which, in storing the moving image data in the device connected to the network, the moving image data may be illegally accessed and abused.SOLUTION: Moving image data input from an image input device is stored in files in units of predetermined amount; secret sharing of the files is performed to generate a plurality of pieces of division data; and the division data pieces are respectively stored in a data server and external storage means. To view the moving image data, restoration means for the division data pieces which is provided in a device used by a user is used, and division data pieces required for restoration are downloaded via a management server and are viewed by restoration. After being used, restored moving image data is deleted.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a monitoring system utilizing cloud computing. In particular, the present invention relates to a cloud computing storage management device and a data storage system that store electronic files of video data of surveillance cameras. In particular, the present invention relates to a data storage management device and a data storage system for dividing an electronic file by a secret sharing technique and storing the divided data. The present invention relates to a surveillance system in which a surveillance camera and a playback device that plays back the video are linked.

Technical background

  In recent years, surveillance cameras have been widely used for crime prevention from the viewpoint of disaster prevention, and they have been installed not only in streets and stores but also in ordinary households. Surveillance camera. There is an advantage that blind spots that cannot be reached by human eyes can be eliminated, and monitoring can be performed for 24 hours. Because of these advantages, it is generally used as a crime prevention system aimed at crime prevention effects.

  Remote monitoring systems using surveillance cameras have been used in systems such as security companies in the past, but due to the widespread use of high-speed network lines using optical fibers, surveillance systems via networks as services for individuals have become available. Has been advocated. For example, in a monitoring system in which a plurality of monitoring terminals and a monitoring center are connected via a network, the monitoring terminal transmits an abnormal information signal based on the detection result of the occurrence of an abnormal situation, and the monitoring center acquires the abnormal information signal. Then, there are some that determine the cause of the abnormality and from which monitoring terminal it is transmitted, and select and notify the monitoring terminal to which the abnormality information is to be notified according to the determination result. In addition, since an inexpensive web camera has been used, it has become possible to view the state of the home in real time with a web camera using a mobile terminal such as a mobile phone from the outside.

  However, since such a monitoring system is a system that passes through a monitoring center, it is necessary that a monitoring person stays in the monitoring center for 24 hours to perform monitoring. In addition, in a system for individuals connecting a web camera and a mobile terminal, an infrared sensor or the like can be provided in the web camera so that a signal notifying abnormality can be transmitted to the mobile terminal. Is difficult to monitor over a wide area, and there are restrictions on the types of sensors that report abnormalities

  The recording medium of the surveillance camera is also recorded using the hard disk of the machine body, and the storage surface of the data has become easier to some extent, but considering the maintenance aspect of the recording medium, the image pixels are lowered. It is set to be able to record for a long time. Decreasing the quality of an image is not a very popular act because it greatly affects the judgment in case of an emergency.

  In recent years, privacy and portrait rights infringements have been highlighted from the viewpoint of protecting personal information related to surveillance camera images. The Ministry of Economy, Trade and Industry's guidelines on personal information includes a description of “a video recorded on a security camera may be an unspecified number of personal information” as an example corresponding to personal information. If a malicious person intentionally leaks the video, privacy and portrait rights may be infringed. Therefore, since the recording information that can be identified by the individual stored in the recording device is “personal information”, it is necessary to take measures to prevent the video from being leaked to anyone other than the related parties or outside the company.

  The amendment and outline of the Personal Information Protection Law, which was approved by the Cabinet on March 10, 2015, include some characteristics of the body of a specific individual, with the name and date of birth stipulated by the current law that will be fully enforced in 2005. A code converted for use in an electronic computer, which can identify the individual, includes a face, fingerprint data, or a license number. The possibility of becoming a law in the future also seems to be very high based on trouble cases related to face recognition.

  When an electronic file in which video is recorded is stored in a device connected to the Internet, there is a possibility that a malicious person can access and acquire the electronic file, and it cannot be said that it is necessarily safe. In the US, an account is already taken from the Internet storage service operated by Apple, and the stored electronic files are stolen. On the other hand, as a measure for protecting an electronic file from such a person, a technique for encrypting and storing the stolen electronic file so that the stolen electronic file cannot be used as it is is known. However, with recent advances in technology and equipment for decrypting ciphers, it has become impossible to say that electronic files that have only been encrypted are safe.

Further, even if an electronic file that records video is encrypted, it is personal information itself from the definition of personal information. If an electronic file that records video leaks, it can be interpreted as the same meaning as personal information leakage.
For example, Patent Document 1 discloses a technique for storing video from a surveillance camera in an image storage unit via a network.

  JP 2006-310900 A

  In addition to the above crime prevention, surveillance cameras can also be expected to be used to monitor accidents and disasters and deal with them quickly to minimize damage. However, the monitoring system for accidents and disasters needs to be monitored 24 hours by the monitoring staff at the monitoring center like the monitoring system described above. Although there is an advantage that it is possible to detect and deal with malfunctions of video equipment from human factors, such a monitoring system requires a place, people, and facilities for monitoring, and thus the monitoring system is very expensive. .

  In the future, surveillance cameras tend to shift to network cameras. Although it is an environment that makes it easy to create a monitoring system from a remote location, it is possible to view an electronic file that records video from anywhere, and there is an advantage that it can be easily stored.

  In recent years, the resolution of images and moving images has increased, and the capacity of electronic files has increased. In the future, there will be a strong tendency to enforce 4K / 8K, and the capacity of electronic files will increase. Therefore, it takes time to download and upload the divided electronic files, resulting in a problem that convenience is deteriorated. Also, with the technique of Cited Document 1, electronic data is sent via a network with weak security. In addition, the complete electronic data remains in the user terminal, and the electronic data may be accessed from the user terminal, resulting in a security problem.

  The present invention has been made in view of the conventional circumstances as described above, and is enhanced in security in the image and communication path held on the server device side, and uses wireless communication. In this case, an object is to propose a technique capable of improving the efficiency of image transmission even when the speed of the wireless communication is low.

The present invention relates to a data storage device and a monitoring system that can safely store an electronic file of moving image data in a device connected to a network, efficiently communicate, and can be used safely in a terminal to be used, and the moving image data Provided is a playback device for playback.
A data storage management device according to the present invention includes a camera that generates moving image data, divided data obtained by dividing the moving image data into n (n ≧ 2) pieces, and any one of the n pieces of divided data m ( n ≧ m ≧ 2) dividing means for dividing the moving image data from the divided data into pieces of divided data, information for associating information for specifying a storage location for each piece of the divided data, and the storage location Index generation means for generating an index including condition information for acquiring the divided data from the control, control for storing the divided data in two or more data servers connected to the Internet, and control for storing the index in a management server And a storage control means for performing an OSI reference model when connected to the Internet and transmitting data to the data server Communication means comprising a predetermined first protocol as a protocol in the fourth layer and a second protocol for communicating at a lower speed than the first protocol, and the divided data to the data server based on the index, the first of the communication means And a communication control unit that performs control to transmit data that has failed to be transmitted by the first protocol using the second protocol.

  The playback apparatus according to the present invention includes a camera that generates moving image data, divided data obtained by dividing the moving image data into n (n ≧ 2) pieces, and any one of the n pieces of divided data (n ≧ n ≧ n). m ≧ 2) dividing means for dividing the moving image data from the divided data into the divided data, and information for associating information for specifying the storage location for each of the divided data and the storage location Index generation means for generating an index including condition information for acquiring divided data, control for storing the divided data in two or more data servers connected to the Internet, and control for storing the index in a management server The storage control means and the fourth layer of the OSI reference model when data is transmitted to the data server connected to the Internet. A communication means having a predetermined first protocol and a second protocol for communicating at a lower speed than the first protocol as a protocol to be transmitted, and using the first protocol of the communication means to the data server based on the index. Communication control means for controlling transmission of data failed to be transmitted using the first protocol using the second protocol, and restored from the divided data stored in the data server of the monitoring system. When the playback device requests the management server to acquire the index, the management server sends the playback device to the playback device from the index. Transmits a list of the divided data that can be acquired, and manages the management from the playback device. When the server selects the desired divided data from the list and is requested to acquire the divided data, the management server stores the divided data requested to be acquired. The server requests the playback device to transmit the divided data requested to be acquired, and the data server requested to transmit is requested to the playback device using the first protocol. The divided data is transmitted.

  According to the present invention, an electronic file can be safely stored in a device connected to the Internet, and even when the electronic data is used in a device connected to the Internet, it can be used safely and can be efficiently communicated.

  FIG. 1 is a diagram illustrating a data storage system.   FIG. 2 is a block diagram of a user device to which an image input device is connected.   FIG. 3 is a diagram illustrating an example of an electronic file to be stored and divided data.   FIG. 4 is a diagram illustrating an example of an index of an electronic file to be stored.   FIG. 5 is a diagram for explaining data transmission / reception between apparatuses.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating a data storage system. FIG. 2 is a block diagram of a user device to which an image input device is connected. First, it demonstrates using these figures. The first user device 1 is a device including a computer connected to the Internet 10. The image input device 5 is a surveillance camera that captures video. The image input device 5 is connected to the first user device 1. In addition, the first user device 1 and the image input device 5 can be configured as an integrated tablet computer. Moreover, the structure etc. which connected information apparatuses, such as a desktop computer, a notebook computer, PDA, a tablet, and a mobile phone, to a security camera are also included. The image input device 5 is a camera that is connected to the first user device 1 and generates image data such as a moving image and outputs the image data to the first user device 1. The image input device 5 may be connected to the first user device 1 via a network. In this case, the image input device 5 includes an interface connected to the network in addition to the camera function. It is preferable to be able to communicate with the power supply by PoE. By connecting a plurality of surveillance cameras to a router having a plurality of ports by PoE, and connecting one first user device 1 to the router, it is possible to easily connect a plurality of surveillance cameras, You can easily connect to the Internet. The moving image data from each monitoring camera can be managed by one first user device.

The second user device 2 is a device including a computer that is wirelessly connected to the wireless base station 3 connected to the Internet 10. For example, the second user device 2 includes an information device such as a television, a PDA, a tablet, and a mobile phone in addition to a desktop computer and a notebook computer. The wireless base station 3 includes a base station such as a wireless LAN in addition to a mobile phone base station. The user apparatus 2 can be connected to the Internet 10 by either wired connection or wireless connection. Further, the user device 2 can reproduce moving image data.
The management server 4 is connected to the Internet 10 and communicates with a device used by a user such as the first user device 1 or the second user device 2 to transmit / receive electronic data such as moving image data and manage an electronic file to be stored. I do. The management server 4 stores data in the first data server 7, the second data server 8, and the third data server 9, and controls data distribution by the read / write control distribution server 6. The first data server 7, the second data server 8, and the third data server 9 store electronic data. The distribution server 6 generates streaming data and distributes the streaming data to the first user device 1 and the second user device 2. In this embodiment, moving image data will be described, but sound data or mixed data of moving image data and sound data can be similarly controlled instead of moving image data.

The control means 11 that controls the entire first user device 1 operates according to a program stored in the ROM 16. The RAM 17 is used for temporary storage of data, a work area of the control means 11, and the like. The ROM 16 also stores setting values such as initial data used by the control means 11. The control unit 11 includes an interface for connecting to an external storage unit 18 such as a USB memory or an SD card, and these can be connected. The communication unit 15 is a communication unit for connecting to the Internet 10. When communicating via the Internet 10, high-speed and low-speed communication protocols described later can be used. Low speed and high speed are not mere bit rate comparisons, but represent whether the amount of image data that can actually be transmitted per unit time is small or large when lines with the same bit rate are used.
The display means 13 is a display means such as a liquid crystal display, and operates based on the control of the control means 11 to display characters and images. The input unit 14 is an input unit such as a switch or a touch panel, and outputs input data to the control unit 11. The image input means 5 is an electronic camera or the like that converts light into an electric signal, and can generate moving image data. The control unit 11 inputs moving image data from the image input unit 5.

The data storage unit 12 includes a first memory 19, a second memory 20, a third memory 21, and a communication data memory 22, and is a storage unit that stores electronic data. For example, a memory such as an HDD, SSD, or RAM.
Next, an example of an electronic file to be stored and divided data will be described with reference to FIG. It is a figure which illustrates memory capacity notionally. The data storage unit 12 further includes a memory 30 that stores moving image data from the image input unit 5. When the moving image data from the image input device 5 is accumulated up to a threshold 31 of a predetermined capacity of the memory 30, the first divided data 32, the second divided data 33, and the third divided data 34 are used using the dividing unit of the control means 11. The image data is divided into two. The divided image data is temporarily stored in the first memory 19, the second memory 20, and the third memory 21, respectively. The image data left in the memory 30 is then overwritten and disappears. The capacity up to the threshold 31 can divide moving image data by a predetermined time, for example, moving image data for one minute. By dividing every minute, you can easily see the scene you want to see. Since it is necessary to acquire divided data, if the divided data is too large, restoration takes time. Moreover, when too small, the frequency of a process will increase. The original data is preferably data of about 10 seconds to 20 minutes. This is made into one original file, secretly distributed to a plurality of divided data, and each divided data is stored in servers in different locations.

The control means 11 stores two of the divided divided data, that is, the first divided data 32 and the second divided data 33 in the first data server 7 and the second data server 8, respectively. The third divided data 34 is stored in the third data server 9 or the external storage means 18. Each divided data is transmitted to a data server at a different location by transmission means, and each divided data is stored in each data server.
When dividing a file, the number of divisions may be three or more, and the sizes may be different. The data divided into n pieces (n ≧ 3) is divided so that it can be restored from the m pieces of divided data (2 <m ≦ n). For example, the divided data divided into three can be restored from any two divided data among the three. The divided data pieces are stored in different places. Risks are dispersed and reduced by storing them separately. The data may be divided into two and restored from both data.

The control unit 11 includes an index generation unit. The image data is divided by the dividing unit, and an index is created by the index generating unit. This index includes information such as the file name of the image data that is the original electronic file, the number of divisions, the data name after division, and the storage location of the divided data. The storage location is determined in advance or specified by a predetermined method such as circulating the storage location. In addition, condition information is included. This condition information can store the number of divided data to be restored, the original electronic file name, and the device unique No. This is information on conditions for restoring, storing, and using an electronic file to be restored, such as public key information, ID, and password for a private key held by a usable device. The generated index is transmitted to the management server 4 and stored. FIG. 4 shows an example of the index. The condition information may be different information as long as it can be restored for each divided data. For example, the third divided data 34 can be used only by the first user device 1, and other data can be used by the first user device 1 or the second user device 2.
The management server 4 controls the reading / writing of data to the first data server 7, the second data server 8, the third data server 9, or the external storage unit 18 that is the storage destination of the divided data based on the stored index. Do. The index sent to the management server 4 is added to the index list. Further, for example, the first user device 1 can be the management server 4. Further, it is preferable that the surveillance camera and the first user device 1 are connected in the same LAN and connected to the external Internet via a firewall. The video data before the division is transmitted only within the LAN, and after the division, the divided data is communicated over the Internet via the firewall. Since the divided data cannot be restored by itself, safe data communication is possible.

In addition, the management server 4 stores information on access to and use of the data servers 7, 8 and 9, the distribution server 6, and the management server 4. This information is collected by a billing unit provided in the management server 4. For example, the usage amount of the data servers 7, 8, and 9 is managed for each user, converted into billing information, and stored. It also accumulates access logs. The user is charged according to the amount used and pays the consideration.
For example, the user requests the management server 4 to disclose an index from the second user device 2. The management server 4 acquires information corresponding to the condition information from the second user device 2, compares it with the index list, and generates an index list that can be disclosed. Data related to the location of the divided data is excluded from the index list. The generated index list is transmitted to the second user device 2.

The second user device 2 displays an index list, causes the user to select desired image data, and passes information indicating the selected desired image data to the management server 4.
The management server 4 extracts the divided data corresponding to the desired image data, and makes a request for acquiring the divided data from the two divided data storage devices necessary for the restoration. For example, a request is made to the first data server 7 and the second data server 8. A combination of the first data server and the third data server 9 is also possible. The first data server 7 and the second data server 8 transmit the corresponding divided data to the management server 4 using a high-speed protocol. At this time, you may encrypt with the public key corresponding to the private key of the 2nd user apparatus 2. FIG.

The management server restores the desired image data, and sends the restored image data to the second user device 2 for use. By programming the control to be deleted after use, the possibility of being stolen by a malicious third party is reduced and the safety is further increased. In this case, since the electronic file does not remain in the used device, it is not stolen by another person. This method is particularly preferable when one electronic file is used by a plurality of users.
The second user apparatus 2 that has issued the index reference request receives the index list, and the user specifies the electronic file to be referred to from the index list. Generate user-specific information for the specified electronic file. The user identification information includes all or important part of the index condition information. The important part includes the ID, password, public key information for the private key of the device used by the user, and the unique number of the device used. And the like. Alternatively, there is no problem even when using two-factor authentication in combination with a one-term password. Those sufficient to identify such users are preferred.

In another example, instead of transmitting directly from the management server 4 to the second user device 2, the restored data is transmitted to the distribution server 6 using a high-speed protocol, and the second user device 2 is transmitted from the distribution server 6. Send using high-speed protocol. For example, if the image data before division is in a format that can be streamed, one piece of divided data is stored in the external storage device 18 and connected to the second user device 2. If the other divided data is stored in the first data server, it is possible to reproduce only by downloading a part of the data without downloading all of the storming data, so that the efficiency of communication can be improved.
The management server 4 accumulates data on access status and usage status of related servers and generates and accumulates accounting information. This information is generated and accumulated for each user or each user device. This information is used to charge the user for usage and receive payment. In addition, for example, when a connection is made from an IP address or MAC address different from the registered IP address or MAC address, unauthorized access can be detected, and the information can be transmitted to a pre-registered mail address. Or you can quickly and automatically report to the administrator.

Since the divided data after the division has no meaning in itself, it is transmitted by a transmission method with low security, and is transmitted at a high speed instead. Since it is necessary to frequently communicate large volumes of data other than communication with the user, security is improved by using divided data that has no meaning on its own, and the communication method uses a low-security transmission method. Use it instead and send it at high speed. Since the load on the communication part of the system that does not communicate directly with the user, such as the backbone, is reduced, more data can be transmitted and received in the same communication band. That is, the communication efficiency can be improved.
Next, communication between computers will be described. In order for computers to communicate correctly, each computer must follow common rules and procedures. Here, the Internet is used for communication between apparatuses. The IP protocol is used for the third layer of the OSI reference model. Then, when communicating at low speed, the TCP protocol is used for the fourth layer, and when communicating at high speed, communication is performed using the TCP protocol and the UDP protocol.

The UDP protocol has a function to execute logical communication between two devices, but the communication procedure is simple, because the other party is identified and sent and received, so the capacity of the communication line can be used a lot for data transmission. It is efficient and can perform high-speed communication. However, since there is no error check or retransmission procedure, there is a problem that even if lost packets are not retransmitted, it is necessary to incorporate a mechanism to improve reliability when reliable communication is required. . The TCP protocol, on the other hand, is protected compared to the UDP protocol in terms of connection establishment, maintenance, disconnection, order control, retransmission control, etc., and thus can perform highly reliable communication, but the communication line capacity can be used for data transmission. There are inefficiencies such as less minutes and waiting time for confirmation of response, etc., resulting in slower communication.
FIG. 5 is a diagram for explaining data transmission / reception between apparatuses. It is the figure which showed the case where it communicates which transmits the electronic data of A apparatus at high speed from A apparatus to B apparatus. In the A apparatus, electronic data to be transmitted to the B apparatus is stored in a storage unit in the A apparatus. This storage means may be a storage means such as a RAM, ROM, flash memory, or HDD built in the A apparatus, or an external memory such as a USB memory, SD memory, or HDD connected to the A apparatus via an interface.

The A device and the B device are connected via the Internet. The A device and the B device are devices that can be connected using the TCP protocol and the UDP protocol. The UDP protocol is a predetermined UDP protocol, and a program for communicating with the communication target apparatus using the UDP protocol is stored. When electronic data is transmitted from the A device to the B device, the connection is first made by the TCP protocol, and the transmission basic information of the electronic data to be transmitted is transmitted from the A device to the B device. This basic transmission information includes the target electronic data capacity, the number of packets, information indicating that transmission is performed using the UDP protocol, packet number, error detection information such as checksum and hash value, and the maximum time required for communication. Information necessary for secure communication. This transmission basic information may be transmitted after being encrypted with a public key corresponding to the private key of the B device, and in this case, more secure communication can be performed.
Next, after the B apparatus acquires the transmission basic information from the A apparatus, the electronic data to be transmitted is transmitted by the UDP protocol. The electronic data is from the first packet to the nth packet, transmitted from the A device, and received by the B device. However, since it is via the Internet, there is a packet that cannot be received correctly by the device B because the packet does not necessarily arrive within a predetermined time or is lost in the middle.

If there is such a lost packet, the lost packet must be retransmitted from the A device to the B device. When the amount of lost packets is equal to or smaller than a predetermined value, a retransmission request is transmitted from the B apparatus to the A apparatus so that the packet is retransmitted by the TCP protocol. This retransmission request is made by the TCP protocol. If the predetermined value is exceeded, a retransmission request is transmitted from the B apparatus to the A apparatus so as to retransmit using the UDP protocol. This retransmission request includes information that can specify the lost packet, such as the protocol used for retransmission and the number of the lost packet.
If there is no lost packet, information indicating that all electronic data has been received is transmitted from the B device to the A device using the TCP protocol.

The A device transmits the lost packet in accordance with the retransmission request from the B device. In this case as well, it is conceivable that the packet is lost. If there is a lost packet, it is determined whether the amount of the lost packet is less than or equal to a predetermined value and a retransmission request is made in the same manner as described above.
If there is no lost packet, information indicating that all electronic data has been received is transmitted from the B apparatus to the A apparatus using the TCP protocol. Here, the lost packet includes a packet including erroneous data determined by the error detection information.

  Since the UDP protocol is used, the communication time is remarkably reduced as compared with the case where everything is communicated with the TCP protocol. In the above-described example, both the TPC and UDP protocols are used. However, it is also possible to use only the UDP protocol by incorporating the same error detection and retransmission control as described above into the communication using the UDP protocol. In this case, however, there is a possibility that the speed can be further increased, but there is a problem that a new communication program is required. High-speed communication can be performed using the good points of different protocols, and the effect increases as the amount of data sent and received increases.

Further, when the divided data divided by the first user device 1 is transmitted to the first data server 7, the second data server 8, and the third data server 9, the TCP protocol and the UDP protocol in the case of communicating at the above-described high speed. Data communication is performed via the Internet 10 by performing control for properly using the.
In addition, when dividing the data into n pieces, storing each piece of divided data in a separate data server and obtaining m pieces of divided data necessary for restoration, the data server that can communicate at the highest speed before obtaining it. To obtain the one that provides the fastest communication speed. For example, communication is performed using pseudo data, the communication speed is measured, and data is acquired in order from a data server that can communicate quickly. In addition, when the original data is, for example, data every minute, when acquiring data for 5 minutes, that is, divided data of five original data, the communication speed is increased for each original data. Measure and get from the data server that can communicate the fastest. By doing so, the original data can be restored more quickly.

  The first user device 1 and the image input device 5 can also be connected via a LAN. In this case, a plurality of image input devices 5 may be provided. By individually performing the same control as described above, for example, the moving image data for each of the two monitoring cameras can be divided into a plurality of pieces of divided data, different indexes can be created, and the data can be stored in different data servers. A plurality of surveillance cameras can be managed by one first user device 1.

  The present invention can be used for an apparatus connected to a network and storing electronic data.

DESCRIPTION OF SYMBOLS 1 1st user apparatus 2 2nd user apparatus 3 Wireless base station 4 Management server 5 Image input apparatus 6 Distribution server 7 1st data server 8 2nd data server 10 Internet

Claims (6)

A camera that generates video data,
The moving image data is divided into n (n ≧ 2) pieces of the moving image data, and the moving image data is restored from any of the n pieces of divided data (n ≧ m ≧ 2) pieces of divided data. Dividing means for dividing the divided data into possible division data;
Index generating means for generating, for each of the divided data, information associated with information for specifying a storage location and an index including condition information for acquiring the divided data from the storage location;
Storage control means for performing control for storing the divided data in two or more data servers connected to the Internet and control for storing the index in a management server;
Transmitting means for transmitting the divided data divided by the dividing means to the data server via the Internet;
A monitoring system comprising: The transmission means is connected to the Internet and transmits data to the data server. The second protocol communicates at a lower speed than the first protocol as a protocol in the fourth layer of the OSI reference model. A communication means comprising:
Communication that performs control to transmit the divided data to the data server based on the index using the first protocol of the communication unit and to transmit data that failed to be transmitted using the first protocol using the second protocol And a control means.   The monitoring system according to claim 2, wherein the communication control unit performs control to transmit the index to the management server using the second protocol. Image storage means for storing the moving image data from the camera;
When the moving image data stored in the image storage unit reaches a predetermined amount, the dividing unit generates the divided data from the predetermined amount of the moving image data, and the index corresponding to the generated divided data The monitoring system according to claim 1, wherein: is generated.   The monitoring system according to any one of claims 1 to 4, wherein the n is 3 or more. A camera that generates moving image data, and divided data obtained by dividing the moving image data into n (n ≧ 2) pieces, and any one of the n pieces of divided data (n ≧ m ≧ 2) pieces of the pieces Dividing means for dividing the moving image data from the divided data into the divided data, information for associating information for specifying a storage location for each divided data, and acquiring the divided data from the storage location Index generating means for generating an index including condition information, control for storing the divided data in two or more data servers connected to the Internet, storage control means for performing control for storing the index in a management server, and the Internet As a protocol in the fourth layer of the OSI reference model when transmitting data to the data server A communication means comprising a predetermined first protocol and a second protocol communicating at a lower speed than the first protocol, and transmitting the divided data to the data server based on the index using the first protocol of the communication means. The moving image restored from the divided data stored in the data server of the monitoring system, the communication control means performing control to transmit data failed to be transmitted in the first protocol according to the second protocol A playback device for playing back data,
When the index acquisition request is sent from the playback device to the management server, the management server sends the playback device a list of the divided data that the playback device can acquire from the index,
When the playback device selects the desired divided data from the list to the management server, and when the acquisition request for the divided data is made, the management server displays the divided data requested for acquisition. The storage server makes a transmission request for the divided data requested to be acquired to the playback device, and the data server requested to transmit the first protocol to the playback device. A reproducing apparatus using the divided data requested to be acquired.

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