JP5118873B2 - Video recording system - Google Patents

Description

  The present invention manages the entry and exit of each area of a visitor, employee or visitor entering a facility divided into multiple areas or rooms, and records the movement status of the residents within the facility. The present invention relates to a video recording system for displaying.

  Various facilities, including hospitals, companies, research facilities, government offices or specific areas or districts, can be divided into multiple areas. Moreover, in facilities, such as a building, it has several floors and the area of each floor is large and each floor is divided into several rooms. In the case of such a hospital facility, for example, a variety of people including in-house workers such as doctors and nurses, inpatients, outpatients, goods suppliers and visitors are considered to be residents in the hospital facility. Become. General residents, excluding office workers, can enter or enter any floor, area, or room within the facility once it is permitted to enter the facility. As an example, if a person unrelated to the examination room or operating room enters, it will be a major obstacle to the medical service.

  In addition, not only a hospital facility but also a deaf person who is not accompanied by a caregiver who has a dementia living in a specific facility, district, or area has a risk of causing a serious accident.

  Conventionally, as countermeasures against this problem, people who enter such facilities and areas have to wear ID cards such as badges and badges to check each person individually or to provide care for those who need security. However, these measures have a problem that the larger facilities and the larger areas have a higher cost burden such as labor costs.

  In recent years, a video camera is installed in each section or room in a facility, and the state inside each section or room is constantly photographed or recorded, and displayed on a monitor screen as necessary.

In recent years, an IC chip storing ID information (hereinafter referred to as “IC tag”) has been devised and has been used not only in the field of merchandise distribution management and sales management, but also as a means for personal authentication. (For example, refer to Patent Document 1).
JP 2002-342737 A

  However, even if a large number of video camera devices are installed in a facility or area, it is often difficult to identify a specific person from many video images. It is extremely difficult to find movement and trends from a large number of video images. For this reason, the conventional video system for security management is for confirming the video recording of the video camera that was installed at the location after an accident or incident occurred in a certain section or location. Therefore, at present, the video data of the location of the specific person (intruder) is not acquired in real time, or the trajectory of the movement of the specific intruder in the facility is not recorded as continuous video data.

  For this reason, the present invention manages the entrance / exit of each resident in the facility divided into a plurality of areas or rooms, and displays the moving state of the resident in the facility in real time as video data. Or an image recording system for recording the same.

For this reason, the present invention relates to a visitor, an employee or a visitor (hereinafter referred to as “ resident ”) who enters a facility having a plurality of areas or rooms (hereinafter referred to as “areas”) divided for each individual area ID. manages the entry and exit of each section of the "hereinafter), a facility in the video recording system for recording the movement of - site's in the facility as an image information, installed in each area of the facility, said area And a plurality of video camera devices that transmit the video data with the area ID corresponding to the video data, and a visitor ID that is attached by each of the visitor and identifies at least each visitor. A plurality of IC tags to be recorded in a memory; a plurality of IC tag reading / writing means that are installed in each area in the facility and that detect a visitor entering each area by the IC tag; and the plurality of IC tags video A video data storage device for storing each video data with each area ID in the facility transmitted from the camera device in order of time passage, the plurality of video camera devices, the plurality of IC tag reading / writing means, and the comprising a management server connected to the video data storing unit, wherein the IC tag read / write unit in which a plurality installed in each zone, said memory to the IC tag read / write means of each IC tag detected write the installation has been the area ID are read time, the management server, the plurality of IC tag reading / writing means wherein - site's ID for each of the facility based on the detection result of the IC tag transmitted from A moving locus database for storing the movement locus at, and a visitor wearing the IC tag by reading the area ID and reading time written in the memory of the IC tag Based on the movement trajectory for each visitor ID stored in the movement trajectory database, the visitor ID has moved from each area ID video data stored in the video video storage means. by select and edit video data area ID in time order, obtain video data obtained by photographing the moving state of the - site's in the facility, it is intended to provide an image recording system according to claim.

Here, the IC tag is composed of a passive type or active type RFID non-contact type IC tag, and in addition to the movement trajectory of a resident who wears the IC tag, a preset on-site entry is provided. The person's classification code is further recorded, and by reading the classification code, entry management and exit management of the resident in each area are performed .

  The video data storage device records each video data transmitted from the plurality of video camera devices as a continuous still image of 5 to 30 frames per second. Here, the video data storage device has a memory capacity for recording at least 72 hours of each video data transmitted from the plurality of video camera devices.

  By the way, since each frame of each video data transmitted from the plurality of video camera devices is attached with time information together with the zone ID, the management server stores each zone ID stored in the video video storage means. It is possible to select and edit the video data of the area ID where the specific visitor ID has moved from the video data in order of time passage. And the video data which image | photographed the said resident's movement state is performed by selecting the video data concerning the specific resident ID designated by the input device connected to the said management server.

  Further, the management server in this video recording system selects video data related to the specific visitor ID in the time range specified by the input device connected to the management server. In addition, the management server is further connected to a tracking video image database that stores the image data edited in the order of time elapsed for each visitor ID.

  By the way, the plurality of video camera devices are composed of a monocular network video camera that captures a wide area in one direction in a responsible area, and a compound eye network camera that can simultaneously capture all directions in the responsible area. Each network camera is configured to transmit respective video data to the video data storage device via a local area network in the area. In addition, the video data is video data compressed based on the JPEG system, thereby reducing the capacity of the video data storage device.

  As described above, the video recording system according to the present invention stores in the video video storage means based on the detection results of the IC tags transmitted from the plurality of IC tag readers arranged in each area in the facility. Since the video data of the area ID to which the visitor ID has moved is selected and edited from the respective area ID video data in the order of time passage, the inside of the facility divided into a plurality of areas or rooms in the facility In addition to managing the entry and exit of each resident in each section, the movement state of the resident within the facility is displayed or recorded in real time as video data.

  Hereinafter, the best embodiment of the in-facility video recording system of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a configuration diagram showing the overall configuration of an in-facility video recording system according to an embodiment of the present invention. In FIG. 1, the in-facility video recording system according to the present embodiment includes an IC tag emblem 1 with an IC tag to be worn or carried by a resident and one or more in-facility areas 2 composed of devices installed in units of rooms. And a video data storage device 3 that stores video image data of a room in which the resident has entered, for each resident ID and for each area ID, and a room that has been entered by tracking the movement path of the resident. A management server 4 for displaying the state, a reception 10 for determining the type of the IC tag emblem 1 to be carried by a resident, and an IC tag 11 attached to the back surface of the IC tag emblem 1 are configured. The IC tag is attached to each resident by the form of emblem or accessory.

  Each area 2 in the facility reads information recorded in the IC tag 11 and transmits it to the management server 4 and imaging data obtained by photographing the inside of the room corresponding to the facility area 2. And one or more video camera apparatuses 22 that transmit video data to which the area ID is assigned to the management server 4.

  Here, it is preferable that the IC tag reader 21 writes the area ID and reading time in which the IC tag reader 21 is installed in the detected IC tag 11. Thereby, by reading the data in the IC tag 11, it is possible to confirm the movement locus of the resident who wears the IC tag 11 from the data of the IC tag 11.

  The reception location in the facility is provided with a display device 101 that displays information on the IC tag patch 1 to be carried by the visitor together with the classification of the visitor and video data of the admission-permitted facility corresponding to the classification.

  An IC tag number (visitor ID) that can be read in advance is recorded in the IC tag 11. The IC tag 11 is a non-contact IC tag. By the way, the IC tag 11 is composed of a passive or active RFID non-contact type IC tag according to the distance between the resident who wears the IC tag and the IC tag reading means. Further, the IC tag patch 1 may be colored corresponding to the classification in the entrance / exit management.

  The camera unit (not shown) of the video camera device 22 can be configured by a surveillance video camera having normal directivity or a surveillance video camera that can simultaneously cover 360 degrees with one unit. In other words, the video camera device 22 installed in the facility simultaneously handles a monocular network video camera that captures a wide range of one direction in the area in charge in consideration of the situation of each area and all directions in the area in charge. It is good to comprise from the compound eye system network camera which can be image | photographed. The network camera transmits the respective video data to the video data storage device 3 via the local area network in the area. Further, the video data is video data compressed based on the JPEG method, thereby enabling the capacity of the video data storage device 3 to be reduced.

  One or a plurality of video camera devices 22 can be installed in one room, and any of them can wirelessly (including a wireless LAN) video video data obtained by assigning an area ID to acquired image data. It shall have the function to transmit by wire (including the Internet network).

  Hereinafter, the operation of the in-facility video recording system of this embodiment will be described.

  The display device 101 of the reception 10 (management room) always (or when a resident appears) classifies the resident, information on admission facilities corresponding to the categorization, and IC carried by the resident. Information about the tag patch 1 is displayed (see FIG. 5).

  The person in charge of the reception 10 confirms the entrance / exit management classification of the visitor by asking a question to the visitor, and visually recognizes the display on the display device 101 (for reception) and carries it to the attendant. The IC tag patch 1 is selected and handed over to the visitor.

  When the visitor enters the facility area 2 and the IC tag 11 is a non-contact type, the IC tag reader 21 installed near the entrance of the facility area 2 reads the record information of the IC tag 11. It transmits to the management server 4. Further, when the IC tag 11 is a contact type, when the visitor enters the in-facility area 2, the IC tag 11 is brought into contact with the IC tag reader 21 installed near the entrance of the in-facility area 2. As a result, the IC tag reader 21 reads the recorded information of the IC tag 11 and transmits it to the management server 4.

  The video camera device 22 always operates to take a picture of the inside of the facility area 2 and transmits video data obtained by adding a zone ID to the imaged data to the video data storage device 3 and the management server 4. Then, the video data storage device 3 sequentially stores video video data obtained by assigning an area ID to the imaging data obtained by photographing the state of the room where the resident enters, in the video data storage device 3 (FIG. 1). is there.

  The video data storage device 3 records each video data transmitted from the video camera device 22 as a continuous still image of 5 to 30 frames per second. This video data storage device is provided with a memory capacity for recording at least 72 hours of each video data transmitted from each video camera device 22. Further, time information is attached to each frame of each video data transmitted from each video camera device 22.

  The management server 4 also acquires the area ID given to the video data transmitted from the video camera device 22 each time one or more IC tag readers 21 read and transmit the record information of the IC tag 11, Both of them can be recorded in the movement trajectory database DB1 (see FIG. 3) in association with each other. The record information of the IC tag 11 includes a visitor ID, whereby a movement record of each of one or more visitors to the in-facility area can be held. Further, the management server 4 writes the video image data transmitted from the video camera device 22 in a file corresponding to the visitor ID on the tracking video image database DB2 (see FIG. 3). However, in the case of a configuration in which video image data of each of one or more visitors is simultaneously transmitted and the video image data is simultaneously written, this writing needs to be processed at the same time. It is assumed that the server 4 can withstand the amount of data and perform a multitask operation.

  In addition, the management server 4 transmits the information from the video camera device 22 when the visitor ID included in the record information of the IC tag 11 matches the visitor ID designated and input by the input device 44 (see FIG. 3). The video image data is displayed on the display screen of the display device 43 (see FIG. 3). Note that the video image data is obtained by adding the area ID to the image data, but the display device 43 can display the image data and the area ID on the same screen.

  FIG. 2 is a configuration diagram showing the configuration of the video camera device 22 of the in-facility video recording system according to the embodiment of the present invention. The video camera device 22 shown in FIG. 2 includes an area ID storage unit 221 that stores an area ID corresponding to the installed in-facility area 2, an imaging unit 222 that captures the situation in the in-facility area 2, and an imaging unit 222. The video data creating unit 223 creates video video data by assigning the zone ID stored in the zone ID storage unit 221 to the imaged data taken by the video data, and the video data creating unit 223 stores the video video data created by the video data creating unit 223. And a transmission unit 224 that transmits to the management server 4.

  It is assumed that the video camera device 22 always operates and transmits the above-described video image data to the image data storage device 3 and the management server 4.

  FIG. 3 is a configuration diagram showing a configuration example of the management server 4 of the in-facility video recording system according to the embodiment of the present invention. The management server 4 shown in FIG. 3 controls the entire video video data transmitted from each of the one or more video camera devices 22 or the video data storage device 3, and the IC tag transmitted from the IC tag reader 21. 11 data processing unit 41 for processing recorded information, video video data transmitted from each of one or more video camera devices 22 or video data storage device 3, and IC tag 11 transmitted from IC tag reader 21 The transmission processing unit 42 for receiving the recorded information respectively, the tracking video image database DB2 in which the video image data simultaneously transmitted from the one or more video camera devices 22 is written for each file corresponding to the visitor ID, and the IC tag 11 The visitor ID included in the recorded information is the visitor ID designated and input by the input device 44 (see FIG. 3). In the case of matching, a display device 43 that displays video image data transmitted simultaneously from one or more video camera devices 22, a visitor ID of a visitor to be displayed, a display end instruction, and the like are designated and input. An input device 44.

  The data processing unit 41 can control the image data of the video image data and the area ID to be displayed on the same screen of the display device 43, respectively. Further, the data processing unit 41 can control the display of the video image data on the display device 43 so as to be performed in the form of real-time processing substantially synchronized with the transmission of the image data from the video camera device 22. Further, the data processing unit 41 displays the video image data on the display device 43, tracks the image data by the video camera device 22, and reads the image data once stored in the video image database DB 2 for later display. It can also be controlled to be performed in the form.

  A plurality of display devices 43 can be installed. In this case, the image of the movement destination can be displayed for a plurality of visitors.

  FIG. 4 is a configuration diagram showing a configuration of a facility to which the in-facility video recording system according to the embodiment of the present invention is applied. In FIG. 4, reference numerals 2 a, 2 b, 2 c, and 2 d indicate the vicinity of the entrance of the facility area 2 (FIG. 1). Reference numeral 2a indicates the vicinity of the entrance to the ward, reference numerals 2b and 2c indicate the vicinity of the entrance to the hospital room, and reference numeral 2d indicates the vicinity of the entrance to the diagnosis room using electromagnetic waves or the like.

  In FIG. 4, reference numerals 5 a to 5 e indicate locations where the video camera device 22 is installed. Here, one video camera device 22 is provided in each room. However, in the present invention, in general, each room can be provided with a plurality of video camera devices 22 (in this case, this room has , Will have multiple institutional zones 2).

  FIG. 5 is an explanatory diagram showing an example of information displayed on the display device 101 of the in-facility video recording system according to the embodiment of the present invention. As shown in FIG. 5, the IC tag 11 includes “in-house worker”, “inpatient”, “visitor”, and “commercial” as the “visitor classification” items indicating the visitor classification. It is recorded. Naturally, by setting different classification codes for each type of “in-house employee”, “inpatient”, “visitor”, and “trader”, more detailed entrance management for each area or room It is also possible to manage exit.

  In the example of FIG. 5, “AB11”, “CD22”, “EF33”, “GH44”, and IC tag numbers corresponding to the respective classification codes as classification codes corresponding to the visitor classification (claim 1). As the visitor ID), “1 to 1000”, “2000 to 3000”, “4000 to 5000”, and “6000 to 7000” are recorded and managed. In addition, each color designation of “white”, “red”, “blue”, “yellow” is recorded as coloring of the IC tag 11 corresponding to these classification codes. The person in charge of the reception 10 collates the response contents from the visitor who inquired verbally with each of the above records, selects the IC tag 11 to be carried by the visitor, and hands it to the visitor. It will be.

  FIG. 6 is a flowchart showing the video data processing operation of the video camera device 22 of the in-facility video recording system according to the embodiment of the present invention. The video data processing operation of the video camera device 22 will be described below with reference to FIGS. 1 to 3 and the flowchart shown in FIG.

  In FIG. 6, first, the video data creation unit 223 inputs imaging data indicating a state inside the facility area 2 captured by the imaging unit 222 (S1). Next, the video data creation unit 223 creates the video video data by adding the area ID stored in the area ID storage unit 221 to the imaging data (S2). Then, the transmission unit 224 transmits the video video data created by the video data creation unit 223 to the management server 4 and the video data storage device 3 (S3).

  FIG. 7 is a flowchart showing a real-time processing operation in the management server 4 of the in-facility video recording system according to the embodiment of the present invention. The real-time processing operation of the management server 4 will be described below using the flowchart shown in FIG. 7 with reference to FIGS.

  First, the data processing unit 41 stands by until the record information of the IC tag 11 is transmitted from the IC tag reader 21, and when the record information is transmitted, the process proceeds to S22 (S21). Then, the data processing unit 41 obtains the area ID given to the video image data transmitted from the video camera device 22 and the recording information of the IC tag 11, respectively, and associates them with the movement locus database. Record in DB1 (S22).

  Next, the data processing unit 41 acquires the video image data (video image data corresponding to the acquired area ID) transmitted from the video camera device 22 (S23).

  Next, the data processing unit 41 writes the acquired video image data in a file corresponding to the visitor ID on the tracking video image database DB2 (S24).

  Next, the data processing unit 41 verifies whether or not a display request for real-time processing is designated and input via the input device 44. If the display request is designated and input, the process proceeds to S26, and the display If the request is not designated, the process returns to S21 (S25).

  The data processing unit 41 then receives one or more visitor IDs in which the visitor ID (that is, the IC tag number) recorded in the recorded information of the acquired IC tag 11 is designated and input via the input device 44. Only when it matches any of the above, the acquired video image data is displayed on the display device 43 corresponding to the matched visitor ID (S26), and the process returns to S21. As a result, the internal state of each facility area 2 to which the designated visitor has moved can be displayed in real time.

  FIG. 8 is a flowchart showing a batch processing operation in the management server 4 of the in-facility video recording system according to the embodiment of the present invention. The batch processing operation of the management server 4 will be described below using the flowchart shown in FIG. 8 with reference to FIGS.

  First, the data processing unit 41 reads the video image data of the file corresponding to the visitor ID designated and input via the input device 44 on the tracking video image database DB2 (S31). The unit of reading is the processing unit of the display device 43.

  Next, the data processing unit 41 displays the read video image data on the display device 43 (S32). Then, the data processing unit 41 verifies whether or not a display end instruction is designated and input via the input device 44. If the end instruction is designated and input, the data processing unit 41 ends the process, and the end instruction is If no designation is input, the process proceeds to S34 (S33).

  In S34, the data processing unit 41 verifies whether or not reading of all data on the tracking video image database DB2 is completed. If reading of all the data is completed, the data processing unit 41 ends the processing, and If the data reading is not completed, the process returns to S31.

  The IC tag emblem 1 does not necessarily have a configuration in which the IC tag 11 is attached to the emblem, and the IC tag 11 is attached to or attached to another portable accessory. Also good.

  In this embodiment, the file corresponding to the visitor ID on the tracking video image database DB2 (see FIG. 3) is prepared for all the one or more visitors, and the video for all the one or more visitors. The video data is written at the same time, but the visitor ID of the visitor to which the video image data is to be written is designated from the input device 44, and the video video data of the designated visitor is stored in the tracking video image database DB2. It is also possible to adopt a configuration in which only writing is performed.

  In the present embodiment, the area ID is stored in the video camera device 22 and transmitted to the management server 4. However, a door opening / closing mechanism or the like is installed at the entrance of the facility area 2. Can be configured to transmit the zone ID to the management server 4 from the control unit of the opening / closing mechanism.

  A program for executing at least a part of the processing of each component of the video recording system according to the present invention by computer control and executing the above processing according to the procedure shown in the flowcharts of FIGS. In addition, a semiconductor memory, a CD-ROM, a magnetic tape, or other computer-readable recording medium may be stored and distributed. A computer including at least a microcomputer, a personal computer, and a general-purpose computer may read the program from the recording medium and execute the program.

  Further, in the embodiment of the present video recording system, a human sensor is installed in each facility area separately from the IC tag reader 21 to detect entrance / exit of a person who is not wearing the IC tag emblem 1, The video recording system can be incorporated into the security management system by attaching an alarm code to the video data obtained by photographing this.

  As described above in detail, in the video recording system according to the present invention, based on the detection result of the IC tag 11 transmitted from the plurality of IC tag readers 21 arranged in each area in the facility, From the video data of each area ID stored in the video data storage device 3, the video data of the area ID to which the visitor ID has moved is selected and edited in order of time passage. As a result, this system manages the entrance / exit of each resident in the facility divided into a plurality of areas or rooms in the facility, and the moving state of the resident in the facility as real-time video data. It was realized to display or record this.

  The present invention manages the entry / exit of each area of a visitor, employee or visitor who enters a facility divided into a plurality of areas or rooms, and records the movement status of the residents within the facility or The present invention relates to a video recording system for display, and has industrial applicability.

It is a block diagram which shows the whole structure of the in-facility video recording system which concerns on embodiment of this invention. It is a block diagram which shows the structure of the video camera apparatus 22 of the in-facility video recording system which concerns on embodiment of this invention. It is a block diagram which shows one structural example of the management server 4 of the in-facility video recording system which concerns on embodiment of this invention. 1 is a configuration diagram illustrating a configuration of a facility to which an in-facility video recording system according to an embodiment of the present invention is applied. It is explanatory drawing which shows an example of the information displayed on the display apparatus 101 of the in-facility video recording system which concerns on embodiment of this invention. It is a flowchart which shows the video data processing operation | movement of the video camera apparatus 22 of the in-facility video recording system which concerns on embodiment of this invention. It is a flowchart which shows the real-time processing operation in the management server 4 of the in-facility video recording system which concerns on embodiment of this invention. It is a flowchart which shows the batch processing operation in the management server 4 of the in-facility video recording system which concerns on embodiment of this invention.

Explanation of symbols

1: IC tag patch 2: Facility area 3: Video data storage device 4: Management server 10: Reception 11: IC tag 21: IC tag reader 22: Video camera device 41: Data processing unit 42: Transmission processing unit 43: Display device 44: Input device 221: Area ID storage unit 222: Imaging unit 223: Video data creation unit 224: Transmission unit DB1: Movement locus database DB2: Tracking video image database

Claims (11)

To each area of residents, employees, or visitors (hereinafter referred to as “entertainers”) who enter a facility having a plurality of areas or rooms (hereinafter referred to as “areas”) divided by individual area IDs An in-facility video recording system that manages the entrance and exit of the facility and records the movement of the resident in the facility as video information,
A plurality of video camera devices that are installed in each area in the facility, shoot video data of the area, and transmit the video data with the area ID corresponding to the video data;
A plurality of IC tags that are worn by each of the resident and record at least the resident ID identifying each resident in its memory;
A plurality of IC tag reading / writing means that are installed in each area in the facility, and that detects a visitor who enters each area by the IC tag;
A video data storage device for storing each video data with each zone ID in the facility transmitted from the plurality of video camera devices in order of time passage;
A plurality of video camera devices, a plurality of IC tag reading / writing means and a management server connected to the video data storage device,
The IC tag read / write unit in which a plurality installed in each zone, writes the memory in the IC tag read / write means reading the area ID which is installed time of each IC tag detected,
The management server
A movement trajectory database for storing a movement trajectory in the facility for each visitor ID based on the detection result of the IC tag transmitted from the plurality of IC tag reading / writing means,
The movement trajectory of the visitor wearing the IC tag is confirmed by reading the area ID and the reading time written in the memory of the IC tag, and the movement trajectory for each visitor ID stored in the movement trajectory database. On the basis of the above, by selecting and editing the video data of the area ID to which the visitor ID has moved from among the area ID video data stored in the video video storage means, in the facility, Obtain video data that captures the movement of the resident .
A video recording system characterized by that. The IC tag is composed of a passive or active RFID non-contact IC tag ,
In addition to the movement trajectory of the resident who wears the IC tag, a preset classification code of the resident is recorded in the memory of the IC tag, and the entrance of the resident in each area is read by reading the classification code. The video recording system according to claim 1, wherein management and exit management are performed . The video according to claim 1 or 2 , wherein the video data storage device records each video data transmitted from the plurality of video camera devices as a continuous still image of 5 to 30 frames per second. Recording system.   4. The video recording system according to claim 3, wherein the video data storage device has a memory capacity for recording at least 72 hours of each video data transmitted from the plurality of video camera devices. 5. The video recording system according to claim 4, wherein each frame of each video data transmitted from the plurality of video camera devices is assigned with the visitor ID together with the area ID and time information. The video data obtained by photographing the moving state of the resident is performed by selecting video data related to a specific resident ID specified by an input device connected to the management server. 3. The video recording system according to 1 or 2 . The video recording system according to claim 1 or 2 , wherein the management server selects video data relating to the specific visitor ID in a time range specified by an input device connected to the management server. . 3. The video recording according to claim 1, wherein the management server is further connected to a tracking video video database that stores the video data edited in order of time passage for each visitor ID. 4. system. The plurality of video camera devices are composed of a monocular network video camera that captures a wide area in one direction in a responsible area and a compound eye network camera that can simultaneously capture all directions in the responsible area. video recording system according to claim 1 or 2, characterized in that is.   The video recording system according to claim 9, wherein the plurality of network cameras transmit respective video data to the video data storage device via a local area network in the area.   The video recording system according to claim 10, wherein the video data is video data compressed based on a JPEG method.

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