JP5629088B2 - Recording data record management system - Google Patents

Description

  The present invention relates to a technique for recording and managing recording data.

  A monitoring system is known in which a predetermined monitoring area is imaged by a monitoring camera constituted by a digital camera or the like, and the obtained digital data is stored in a hard disk device as recorded data (for example, see Patent Document 1).

  The recorded data stored in the hard disk device of the monitoring system may become necessary as important evidence later. Therefore, the recorded data acquired from the monitoring camera must be recorded on the hard disk device without being lost. Also, the recorded data stored in the hard disk device must be in a state where it can be read out as needed.

JP 2007-140955 A

  However, in such a monitoring system, the surveillance camera acquires the recording data in real time 24 hours a day, so that the recording data is written to the hard disk device while the hard disk device is constantly operated, and therefore 24 hours a day. The hard disk device is being accessed. As described above, since the hard disk device included in the monitoring system is subjected to a large burden, there is a situation that troubles such as failure are apt to occur.

  For example, if the hard disk device becomes unwritable due to a failure, the recording data acquired from the monitoring camera during that time cannot be recorded. Further, for example, if the management area of the hard disk device cannot be read, the recorded data stored in the hard disk device cannot be read at all.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a technique capable of reliably recording and managing recorded data.

According to a first aspect of the present invention, there is provided one or more recording management devices that acquire imaging data acquired by the imaging means as recording data and record and manage the recording data, and the one or more recording management devices via a communication line. A first storage device that stores the recorded data, and a first storage device that controls writing and reading of data to and from the first storage device. A second storage device that stores the recording data acquired from the one or more recording management devices; and a second storage device that controls writing and reading of data to and from the second storage device. 2 control means, wherein the second control means temporarily stores the recording data acquired from the one or more recording management devices in the second storage device. , Assist in recordkeeping of the recording data in the recording management apparatus, wherein the first control means, when an abnormality in the first storage unit occurs, newly acquired during the period until the first storage device is restored The recorded data is transmitted to the auxiliary recording device as temporary save data, and the second control means acquires the recorded data transmitted as the temporary save data from the one or more recording management devices, Temporarily storing in the second storage device, and when the first storage device provided in any one or more of the one or more record management devices recovers, obtains from the record management device and stores in the second storage device The recorded data that has been read out is transmitted to the recording management device, and the first control means stores the recorded data received from the auxiliary recording device in the first storage device, The recording data acquired by the recording management device is time-series data obtained along recording time, and the recording data is a first type in which an image signal in a frame is encoded without using inter-frame prediction. A frame and a second type frame obtained by encoding an image signal of the frame using inter-frame prediction are included, and the second control means is transmitted from the recording management device as the temporary save data When the recording data is acquired, the recording data is divided at predetermined time intervals with respect to the recording time, and the plurality of first type frames included in the same division are stored in the first storage area of the second storage device. In addition to recording, a plurality of the second type frames included in the same section are recorded in a second storage area of the second storage device, and the recorded data stored in the second storage device is read. When transmitting to the recording management device, the plurality of first type frames recorded in the first storage area are first transmitted and the transmitted first type frames are transmitted from the second storage device. Then, the plurality of second type frames recorded in the second storage area are transmitted, and the transmitted second type frames are erased from the second storage device .

  A second aspect of the present invention is the recorded data recording management system according to the first aspect, comprising a plurality of the recording management devices.

A third aspect of the present invention is the recorded data recording management system according to the first or second aspect , wherein the first control means receives the plurality of first type frames and the plurality received separately from the auxiliary recording device. The second type frames are mixed again and rearranged along the recording time, and stored in the first storage device.

The invention of claim 4 is the recording data recording system of claim 3, wherein the second control means, to each of said plurality of first type frame stored in the first storage area, the Information of the second type frame that is continuous in time series with respect to the first type frame and the recording time is added and transmitted to the recording management device.

A fifth aspect of the present invention is the recorded data recording management system according to any one of the first to fourth aspects, wherein each of the one or more recording management devices includes a plurality of the first storage devices. When no abnormality occurs in any of the plurality of first storage devices, one control unit records the newly acquired recording data in each of the plurality of first storage devices, and When an abnormality occurs in at least one of the first storage devices, the recording data newly acquired until the first storage device in which the abnormality has occurred is restored is the first in which no abnormality has occurred. The data is stored in one storage device and transmitted to the auxiliary recording device as temporary saving data.

The invention of claim 6 is the recorded data recording management system according to any one of claims 1 to 5 , wherein each of the one or more recording management devices is a volatile storage device, The first storage device holds management information corresponding to the recorded data recorded in the own device, and the first control means writes the recorded data into the first storage device. When the management information is updated by being performed, the management information being updated is stored in the third storage device, and when the recording data has been written and the management information has been updated, The updated management information is transmitted to the auxiliary recording device, and the second control means acquires the updated management information from the one or more recording management devices and stores it in the second storage device.

According to the first to sixth aspects of the present invention, the recording management device for recording and managing the recording data is connected to the auxiliary management device via the communication line, and the auxiliary recording device records the recording data acquired from the recording management device. By temporarily storing, recording management of recording data in the recording management apparatus is assisted. According to this configuration, the reliability of recording management can be improved compared to the case where the recording management apparatus performs recording management of recorded data alone.
According to the first to sixth aspects of the present invention, when an abnormality occurs in the first storage device included in the recording management device, the recorded data newly acquired until the first storage device is restored is The data is transmitted to the auxiliary recording device as temporary saving data, and is temporarily stored in the second storage device included in the auxiliary recording device. According to this configuration, it is possible to guarantee the recording of newly acquired recording data while an abnormality occurs in the first storage device.
In addition, according to the first to sixth aspects of the present invention, when the first storage device included in the recording management device is restored, the video recording acquired from when the abnormality occurred in the first storage device until the first storage device was restored. Data is written back from the second storage device included in the auxiliary recording device to the restored first storage device included in the recording management device. According to this configuration, after the first storage device is restored, the recorded data is recorded and managed again only on the recording management device side, so that the complexity of managing the recorded data can be avoided.
According to the first to sixth aspects of the present invention, when the second control means records the recording data in which the first type frame and the second type frame are mixed in the second storage device, it is included in the same category. A plurality of first-type frames and a plurality of second-type frames are recorded together in separate areas, and recording data recorded in the second storage device is transmitted to the recording management device. The second type frames are transmitted in this order. Since the first type frame does not use inter-frame prediction, it can be reproduced independently. Therefore, the recording management apparatus can grasp the outline of the recording contents of the recording data when only the first type frame is received.
Further, according to the first to sixth aspects of the present invention, when the second control means transmits the recording data recorded in the second storage device to the recording management device, the first type frame and the second type frame are transmitted. The frames are transmitted in order, and the transmitted frames are sequentially deleted from the second storage device. Since the first type frame has a larger data size than the second type frame, according to this configuration, it is possible to secure a large continuous free space in the second storage device at an early stage.

  In particular, according to the second aspect of the present invention, the recorded data recording management system includes a plurality of recording management devices. That is, the auxiliary management device is shared by a plurality of record management devices. According to this configuration, it is possible to efficiently improve the reliability of recording management in each recording management apparatus while suppressing the cost of the entire recording data recording management system.

In particular, according to the invention described in claim 3 , the first control means remixes the plurality of first type frames and the plurality of second type frames received separately and rearranges them along the recording time. The state is stored and stored in the first storage device. According to this configuration, the recording data can be appropriately managed in the first storage device along the recording time.

In particular, according to the invention described in claim 4 , since the second control means adds the information of the second type frame that is continuous in time series with the first type frame to each of the plurality of first type frames. In the recording management apparatus, a plurality of first type frames and a plurality of second type frames received separately can be smoothly rearranged along the recording time.

In particular, according to the fifth aspect of the present invention, the recording management device includes a plurality of first storage devices and records the recording data in each of them, so that the recording guarantee of the recording data can be ensured. In particular, when an abnormality occurs in at least one of the plurality of first storage devices, newly acquired recording data until the first storage device is restored is transmitted to the auxiliary recording device as temporary save data. And temporarily stored in the second storage device included in the auxiliary recording device. Therefore, even if an abnormality occurs in any of the first storage devices, it is possible to guarantee recording of the recorded data.

In particular, according to the sixth aspect of the invention, since the management information of the first storage device provided in the recording management device is backed up by the auxiliary recording device, the management information of the first storage device can be appropriately protected. it can. In particular, while the management information is being updated, the latest management information is backed up in the third storage device of the recording management device, so that the latest management information is always maintained without being affected by delays in the communication line. Can be backed up.

It is a figure which shows the structure of a monitoring system. It is a block diagram which shows the structure of a local recording device. It is a block diagram which shows the structure of an auxiliary recording device. It is a figure which shows typically the storage state of the data in HDD with which a local recording device is provided. It is a figure which shows typically the storage state of the data in HDD with which an auxiliary recording device is provided. It is a figure which shows the flow of the process regarding recording of the video recording data performed in a monitoring system. It is a figure which shows the motion of data when both local HDD is operate | moving normally. FIG. 4 is a diagram illustrating data movement when one of the local HDDs is not operating normally. It is a figure which shows the flow of the process regarding the write-back of the recording data performed in a monitoring system. It is a figure which shows the motion of data when a local HDD is restored. It is a figure which shows the motion of data when video recording data is transmitted from a local recording device to an auxiliary recording device. It is a figure which shows the motion of the data in each step at the time of recording data being written back from an auxiliary recording device to a local recording device. It is a figure which shows the motion of the data in each step at the time of recording data being written back from an auxiliary recording device to a local recording device. It is a figure which shows the motion of the data in each step at the time of recording data being written back from an auxiliary recording device to a local recording device. It is a figure which shows the motion of the data in each step at the time of recording data being written back from an auxiliary recording device to a local recording device. It is a figure which shows the flow of the update process of management information. It is a figure which shows the motion of the data in each step at the time of management information being updated. It is a figure which shows the motion of the data in each step at the time of management information being updated.

<1. Monitoring system configuration>
A configuration of a monitoring system 100 to which a recorded data recording management system according to an embodiment of the present invention is applied will be described with reference to FIG. FIG. 1 is a diagram illustrating a configuration of the monitoring system 100.

  The monitoring system 100 includes a plurality of local management systems 1 and auxiliary recording devices 2 that are connected to each other via a network N. The local management system 1 is provided in various stores, for example, acquires video data of the monitoring area using the installed store as a monitoring area, and records and manages the acquired video data as recording data. The auxiliary recording device 2 is provided in a management center, for example, and assists in recording management of recording data in each of a plurality of local management systems 1 connected via the network N.

<1-1. Local management system 1>
The local management system 1 includes a plurality of monitoring cameras (imaging devices) 11 that shoot a monitoring area, a local recording device 12 that records and manages imaging data acquired by each monitoring camera 11 as recorded data 9, and a local recording device 12. And a video reproduction device 13 for reproducing the recorded data 9 recorded in The devices 11, 12, and 13 are communicably connected via a cable or a network. In addition, the local management system 1 is further provided with a hub device that collects cables of a plurality of surveillance cameras 11, a router for connecting each device to a network, and the like (all not shown).

<Monitoring camera 11>
The monitoring camera 11 captures a predetermined monitoring area, continuously acquires moving image data (imaging data), and transfers the acquired imaging data to the local recording device 12.

  The surveillance camera 11 is configured as a general digital camera. Specifically, an optical mechanism having an AF (autofocus) function, an automatic aperture function, and the like, and an imaging element (for example, a CCD sensor) that forms a subject image from the optical mechanism are provided. The imaging device continuously captures the monitoring area and continuously acquires the imaging data of the monitoring area. The monitoring camera 11 also includes an analog signal processing circuit that A / D converts image data acquired by the image sensor into a digital image signal. Furthermore, the monitoring camera 11 is configured as a so-called network camera having a function connectable to a network, and includes a communication unit that provides an interface function for connecting the monitoring camera 11 to the network. The communication unit transmits the A / D converted image data to the local recording device 12 via the network.

<Local recording device 12>
The local recording device 12 is a device that receives imaging data transmitted from each of the plurality of monitoring cameras 11 and records and manages the data as recorded data 9, and is configured by a digital video recorder (DVR), for example. Is done. The configuration of the local recording device 12 will be specifically described with reference to FIG. FIG. 2 is a block diagram showing the configuration of the local recording device 12.

  The local recording device 12 includes a CPU 121, a ROM 122, a RAM 123, an image processing unit 124, an operation unit 125, a display unit 126, a plurality (two in this embodiment) of hard disk drives (hereinafter referred to as “HDD”) 127, A semiconductor memory 128 and a communication unit 129 are provided. These parts are connected to each other via a bus wiring 120.

  The CPU 121, ROM 122, and RAM 123 function as the control unit 10 that controls each component included in the local recording device 12. That is, the CPU 121 operates in accordance with a program stored in the ROM 122 and controls each configuration of the local recording device 12 while using the RAM 123 as a temporary working area.

  The image processing unit 124 is hardware dedicated to image processing (for example, an image processing board), and is housed inside the local recording device 12 and connected to bus wiring. The image processing unit 124 includes an interface (connector or the like) (not shown) for connecting a plurality of monitoring cameras 11 and a buffer memory (semiconductor memory) for receiving imaging data from the monitoring camera 11. The image processing unit 124 performs predetermined image processing (pixel interpolation processing, color space conversion processing, contour correction processing, while storing imaging data input in real time from the monitoring camera 11 connected to the interface in a buffer memory. And filtering). Further, the imaged data subjected to the image processing is a predetermined moving image compression method (in this embodiment, H.264, but MPEG2 (Moving Picture Experts Group 2), MPEG4 (Moving Picture Experts Group 4), etc.) In other words, the recorded data 9 is generated in real time. That is, the local recording device 12 in this embodiment acquires the recording data 9 by generating the recording data 9 based on the imaging data that the image processing unit 124 receives from the monitoring camera 11.

  Note that a functional unit corresponding to the image processing unit 124 may be provided in the monitoring camera 11 instead of the local recording device 12. In this case, the recording data 9 is generated in the monitoring camera 11, and the recording data 9 is received from the monitoring camera 11, whereby the local recording device 12 acquires the recording data 9.

  The operation unit 125 and the display unit 126 function as a man-machine interface with the operator. The operation unit 125 is various buttons and keys, and is used by an operator to input an instruction to the local recording device 12. The display unit 126 includes various lamps, LEDs, indicators, and the like, and mainly displays the state of the local recording device 12. The display unit 126 of the local recording device 12 may be a device (for example, a liquid crystal display or a CRT) having a function of displaying the recorded data 9. That is, the local recording device 12 may have a function of playing back video.

  The HDD 127 is a kind of storage device and is used for storing the recorded data 9. As described above, the local recording device 12 according to this embodiment includes two HDDs 127, and the control unit 10 performs mirroring by simultaneously writing the same recorded data 9 to each HDD 127. That is, in the local recording device 12, a RAID 1 system is realized. Each HDD 127 has a structure in which recorded data 9 is read and written (accessed) by a magnetic head while an aluminum or glass disk (platter) coated with a magnetic material is rotated at high speed by a rotating motor (spindle motor). As each HDD 127, a general hard disk drive distributed in the market can be adopted. Further, for example, a so-called hybrid HDD equipped with a flash memory may be applied. Further, as a standard for connecting each HDD 127, SCSI, IDE, or the like can be adopted. Furthermore, although the local recording device 12 in this embodiment has each HDD 127 mounted inside the casing, each HDD 127 may be connected to the outside of the casing of the local recording device 12 by a dedicated cable or the like.

  The semiconductor memory 128 is a kind of storage device. In this embodiment, the semiconductor memory 128 is configured by, for example, a DRAM (Dynamic Random Access Memory) including a plurality of volatile storage elements. When the semiconductor memory 128 is constituted by a DRAM, the local recording device 12 preferably includes a backup power source (battery) (not shown) as a measure against power failure.

  The communication unit 129 provides a network interface function for connecting the local recording device 12 to the network N. In particular, the communication unit 129 has a function of transmitting and receiving recorded data 9 and the like with the auxiliary recording device 2 via the network N. That is, it has a function of transmitting the recording data 9 and the like recorded in the HDD 127 to the auxiliary recording device 2 and a function of receiving the recording data 9 and the like recorded in the HDD 26 (see FIG. 3) of the auxiliary recording device 2. Yes. The communication unit 129 has a function of transmitting the recording data 9 recorded in the local recording device 12 to the video reproduction device 13 in response to a request from the video reproduction device 13.

<Video playback device 13>
The video playback device 13 is a device having a function as a general computer, can receive the recorded data 9 from the local recording device 12 via a network or the like, and displays the received recorded data 9 A display is provided. That is, the video reproduction device 13 has a function of reproducing at least the recorded data 9 recorded in the local recording device 12.

  By checking the recorded data 9 reproduced by the video reproduction device 13, the operator can monitor the monitoring area. Note that the video reproduction device 13 may include a plurality of displays. That is, a number of displays corresponding to the number of monitoring cameras 11 included in the local management system 1 may be connected. When the number of displays is smaller than the number of surveillance cameras 11, the display screens may be switched as appropriate and displayed. Furthermore, the recorded data 9 reproduced in the video reproducing device 13 may be acquired in real time or may be past recorded data 9.

<1-2. Auxiliary Recording Device 2>
The auxiliary recording device 2 is a device for assisting the recording management of the recording data 9 in the local recording device 12 provided in each of the plurality of local management systems 1 connected via the network N. For example, the auxiliary recording device 2 is a digital video recorder. Composed. The configuration of the auxiliary recording device 2 will be described with reference to FIG. FIG. 3 is a block diagram showing a configuration of the auxiliary recording device 2.

  The auxiliary recording device 2 includes a CPU 21, a ROM 22, a RAM 23, an operation unit 24, a display unit 25, a hard disk drive (hereinafter referred to as “HDD”) 26, a semiconductor memory 27, and a communication unit 28. These units are connected to each other via a bus wiring 29.

  The CPU 21, the ROM 22, and the RAM 23 function as a control unit 20 that controls each component included in the auxiliary recording device 2. That is, the CPU 21 operates according to a program stored in the ROM 22 and controls each configuration of the auxiliary recording device 2 while using the RAM 23 as a temporary working area.

  The operation unit 24 and the display unit 25 function as a man-machine interface with the operator. The operation unit 24 is various buttons and keys, and is used by an operator to input an instruction to the auxiliary recording device 2. The display unit 25 includes various lamps, LEDs, indicators, and the like, and mainly displays the state of the auxiliary recording device 2.

  The HDD 26 is a kind of storage device, like the HDD 127 included in the local recording device 12, and here, in order to store the recording data 9 and the like acquired from a plurality of local recording devices 12 connected via the network N. used. The auxiliary recording device 2 may be configured to include a plurality of HDDs 26 according to the required storage capacity. As the HDD 26, a general hard disk drive distributed in the market, a hybrid HDD, or the like can be adopted as in the HDD 127. Further, although the auxiliary recording device 2 in this embodiment has the HDD 26 mounted inside the housing, the HDD 26 may be connected to the outside of the auxiliary recording device 2 by a dedicated cable or the like.

  The semiconductor memory 27 is a kind of storage device, similar to the semiconductor memory 128, and in this embodiment is constituted by, for example, a DRAM.

  The communication unit 28 provides a network interface function for connecting the auxiliary recording device 2 to the network N. In particular, the communication unit 28 has a function of transmitting / receiving recorded data 9 and the like to / from a plurality of local recording devices 12 connected via the network N. That is, the communication unit 28 has a function of transmitting the recording data 9 and the like recorded in the HDD 26 to an arbitrary local recording device 12 and a function of receiving the recording data 9 and the like recorded in the HDD 26 of each local recording device 12. Have.

<2. Data stored on hard disk drive>
Data storage states of the HDD (hereinafter referred to as “local HDD”) 127 included in the local recording device 12 and the HDD (hereinafter referred to as “auxiliary HDD”) 26 included in the auxiliary recording device 2 will be described.

<2-1. Local HDD 127>
Reference is made to FIG. FIG. 4A is a diagram schematically showing a storage state of data in the local HDD 127. In the local HDD 127, an area (recording area) 1271 for recording the recorded data 9 and an area (management area) 1272 for recording the management information 90 are formed. However, a plurality of management areas 1272 (two in this embodiment) are formed, and management information 90 is recorded in each management area 1272. That is, in the local HDD 127, the management information 90 is recorded twice.

<Recording area 1271>
Recorded data 9 is stored in the recording area 1271. In this embodiment, the recording area 1271 is divided into a plurality of unit storage areas (blocks) ordered by block numbers or the like, and when the recording data 9 is written to the local HDD 127, The recorded data 9 is written in order from the smallest numbered block. The size of one block is, for example, about 10G to 50G.

  Here, the recording data 9 stored in the local HDD 127 will be specifically described with reference to FIG. As described above, the image processing unit 124 encodes imaging data input in real time from the monitoring camera 11 into a frame such as an I, P, or B frame in a predetermined video encoding format, and compresses the data as recorded data 9. get. That is, the recording data 9 is time-series data obtained along the recording time, and includes I, B, and P frames in a mixed manner.

  However, an “I frame” is a frame obtained by encoding an image signal in a frame without using inter-frame prediction. Therefore, the I frame is completed by itself, and the original frame image can be restored only by the information of the I frame. On the other hand, “P frame” and “B frame” are frames obtained by encoding an image signal of a frame using inter-frame prediction. For example, “P frame” is difference information between the image of the corresponding frame and the image of the I frame or the P frame immediately before the image. Therefore, in order to decode the P frame, information on the immediately preceding I frame or P frame is required. The “B frame” is compressed using not only the previous frame but also the difference with the subsequent frame. Therefore, in order to decode the B frame, information on the preceding and subsequent I frames and P frames is required.

  H. In a moving image compression method such as H.264, the above-described I, B, and P frames are compressed and expanded in units of a group called GOP (Group of Picture) rather than independently. H. In the case of H.264, the GOP is configured in units of 15 frames (0.5 seconds), such as IPPBBPPPPPPBBPP. In the upper case, there are 1 I frame, 10 P frames, and 4 B frames in one GOP.

  In the recording area 1271, the recorded data 9 is stored in a state of being arranged in chronological order along the recording time in GOP units. In each GOP, 15 frames included in the GOP are arranged in chronological order along the recording time with the I frame at the head.

  In the following, for the sake of simplicity, it is assumed that the recorded data 9 is encoded into I frames and P frames, and 1 GOP is composed of 15 frames. In this case, 1 GOP is configured with IPPPPPPPPPPPPPP starting from the I frame. That is, one I frame and 14 P frames exist in one GOP. In the following description, 14 P frames belonging to the same GOP are referred to as “P frame group”. That is, here, the recorded data 9 stored in the recording area 1271 includes the I frame I (1) of the first GOP, the P frame group P (1) of the first GOP, the I frame I (2) of the second GOP, and the second GOP. The P frame group P (2),... Is in a state where I frames and P frame groups are alternately arranged.

<Management area 1272>
In the management area 1272, management information 90 of the local HDD 127 is stored. The management information 90 is information corresponding to the recorded data 9 recorded in the recording area 1271, and specifically includes address information of the recorded data 9 recorded in the recording area 1271. The address information includes information (identification information) for specifying the recording data 9 recorded in the recording area 1271 and information (address information) for specifying the area in which the recording data 9 is stored. Associated information.

  Further, the management information 90 includes log information of the local management system 1. The log information is information describing the time of occurrence of various events (for example, occurrence of an alarm, occurrence of abnormality of the local HDD 127, etc.) that occurred in the local management system 1.

  As described above, the recording area 1271 is divided into a plurality of blocks, and the recording data 9 is written in units of blocks. In response to this, the management information 90 is hierarchized into two layers, more specifically, management information (block management information) for each block and management information (overall management information) for managing the management information for all blocks. It has been configured. The overall management information is information in which identification information of the recorded data 9 is associated with information (for example, a block number) for specifying a block in which the recorded data 9 is recorded. The block management information is information in which identification information of the recorded data 9 is associated with information for specifying in which area in the block the recorded data 9 is stored. In this way, by hierarchizing the management information 90, the time required for reading the recorded data 9 from the local HDD 127 can be shortened.

  When recording the recording data 9 in the recording area 1271, the control unit 10 writes the recording data 9 in a predetermined area of a predetermined block and then manages information 90 (specifically, so as to correspond to the recording). Update the overall management information and the block management information of the block to be written). On the other hand, when the recorded data 9 recorded in the recording area 1271 is read out, the control unit 10 first specifies the area in which the recorded data 9 to be read is recorded with reference to the management information 90, and then the recording data is recorded. With reference to the specified area of the area 1271, the data recorded there is read out. With such a configuration, the frequency of writing / reading on the management area 1272 is very high, and as a result, the frequency of writing / reading errors on the management area 1272 also increases. If writing / reading to / from the management area 1272 becomes impossible, the recorded data 9 recorded in the recording area 1271 cannot be read at all. For this reason, the management information 90 needs to be protected particularly strictly.

<2-2. Auxiliary HDD 26>
Please refer to FIG. FIG. 5 is a diagram schematically showing a storage state of data in the auxiliary HDD 26. In the auxiliary HDD 26, a recording area 261 for recording various data acquired from the local recording device 12, and management information for recording management information of the auxiliary HDD 26 (specifically, address information of various data recorded in the recording area 262) are recorded. A region 262 is formed.

  In the recording area 261, a temporary save data recording area 261a for recording the recorded data 9 transmitted as temporary save data from the plurality of local recording devices 12 connected via the network N is formed. How the recorded data 9 is stored in the recording area 261a will be described later.

  Further, in the recording area 261, a backup management information recording area 261b for recording backup data of the management information 90 of the local HDD 127 provided in each of the plurality of local recording devices 12 is formed. That is, in the monitoring system 100, the management information 90 of the local HDD 127 of the local recording device 12 included in each of the plurality of local management systems 1 is double protected in each local HDD 127 and further backed up in the auxiliary HDD 26. , Protected in triplicate. How the management information 90 is stored in the recording area 261b will be described later.

<3. Operation of the monitoring system>
<3-1. Processing related to recording of recorded data 9>
<I. Recording of recorded data 9>
When a predetermined initial setting is executed in the monitoring system 100 and operation is started, acquisition of the recorded data 9 is started in each local management system 1. Specifically, in the local management system 1, the monitoring camera 11 starts acquisition of imaging data, and transmits the acquired imaging data to the local recording device 12. Then, the image processing unit 124 of the local recording device 12 generates the recording data 9 from the acquired imaging data.

  The recorded data 9 is recorded in the local HDD 127 of the local recording device 12 or the like. This process will be described with reference to FIGS. FIG. 6 is a diagram showing a flow of processing relating to recording of the recording data 9 executed in the monitoring system 100. FIG. 7 is a diagram illustrating data movement when both of the two local HDDs 127 included in the local recording device 12 are operating normally. FIG. 8 is a diagram showing data movement when one of the two local HDDs 127 is not operating normally.

  When the recording data 9 is acquired from the image processing unit 124 (YES in step S11), the control unit 10 of the local recording device 12 temporarily stores the acquired recording data 9 in the semiconductor memory 128, and subsequently two The drive state of each local HDD 127 is confirmed (step S12).

  When both of the two local HDDs 127 are operating normally (YES in step S12), the control unit 10 simultaneously writes the recording data 9 stored in the semiconductor memory 128 into each of the two local HDDs 127 ( Step S13). That is, the recorded data 9 recorded in the semiconductor memory 128 is transferred and stored in each of the two local HDDs 127 (FIG. 7).

  On the other hand, if there is a local HDD 127 that is not operating normally (NO in step S12), the control unit 10 writes the recording data 9 stored in the semiconductor memory 128 to the local HDD 127 that is operating normally. At the same time (step S14), the recording data 9 is transmitted to the auxiliary recording device 2 as temporary saving data (step S15).

  When the control unit 20 of the auxiliary recording device 2 receives the recording data 9 transmitted as temporary save data from any of the plurality of local recording devices 12 connected via the network N (YES in step S101). The received recording data 9 is written into the auxiliary HDD 26 via the semiconductor memory 27 (step S102) (FIG. 8).

<Ii. Writing back temporarily saved data>
As described above, in any one of the plurality of local management systems 1 included in the monitoring system 100, when an abnormality occurs in at least one of the two local HDDs 127 included in the local recording device 12, it is acquired in the local recording device 12. The recorded data 9 is sent to the auxiliary recording device 2 as temporary saving data and recorded in the auxiliary HDD 26.

  In the monitoring system 100, when the local HDD 127 in which an abnormality has occurred is restored, the recorded data 9 recorded in the auxiliary HDD 26 is written back to the restored local HDD 127. This process will be described with reference to FIGS. FIG. 9 is a diagram showing a flow of processing relating to writing back of the recorded data 9 executed in the monitoring system 100. FIG. 10 is a diagram showing data movement when the local HDD 127 is restored.

  Now, in one of a plurality of local recording devices 12 connected to the auxiliary recording device 2 via the network N (hereinafter referred to as “target local recording device 12”), one of the two local HDDs 127 provided therein is abnormal. Suppose that the local HDD 127 in which the abnormality occurred is restored again by measures such as HDD repair or replacement. In this case, the recording data 9 acquired in the target local recording device 12 between the occurrence of an abnormality in the local HDD 127 and the recovery is recorded in the auxiliary HDD 26 of the auxiliary recording device 2 as temporary save data.

  When the control unit 10 of the target local recording device 12 confirms that the local HDD 127 where the abnormality has occurred has been restored (YES in step S21), the control unit 10 notifies the auxiliary recording device 2 to that effect (step S22).

  When the notification indicating that the local HDD 127 has been restored is received from the target local recording device 12 (YES in step S201), the control unit 20 of the auxiliary recording device 2 stores the recorded data 9 recorded as temporary save data from the auxiliary HDD 26. The data is read and transmitted to the target local recording device 12 (step S202).

  When the recording data 9 recorded as the temporary saving data is transmitted to the target local recording device 12, the control unit 20 of the auxiliary recording device 2 deletes the transmitted recording data 9 from the auxiliary HDD 26 (step S203).

  On the other hand, when the recording data 9 is received from the auxiliary recording device 2 (YES in step S23), the control unit 10 of the local recording device 12 writes the received recording data 9 to the restored local HDD 127 via the semiconductor memory 128. (Step S24).

<Iii. Transfer of recorded data 9 between the local recording device 12 and the auxiliary recording device 2>
As described above, when an abnormality occurs in at least one of the two local HDDs 127 included in the local recording device 12 in any of the plurality of local management systems 1 included in the monitoring system 100, the local HDD 127 is recovered from the abnormality. During this time, the recording data 9 is transmitted from the local recording device 12 to the auxiliary recording device 2. Further, when the local HDD 127 recovers from the abnormality, the recording data 9 is transmitted from the auxiliary recording device 2 to the local recording device 12. These processes will be described more specifically.

<From the local recording device 12 to the auxiliary recording device 2>
Processing for transmitting the recording data 9 from the local recording device 12 to the auxiliary recording device 2 will be described with reference to FIG. FIG. 11 is a diagram showing data movement when the recorded data 9 is transmitted as temporary save data from the local recording device 12 to the auxiliary recording device 2 and the transmitted recorded data 9 is stored in the auxiliary HDD 26.

  When the recording data 9 transmitted as temporary saving data from the local recording device 12 is received, the control unit 20 of the auxiliary recording device 2 temporarily stores the acquired recording data 9 in the semiconductor memory 27.

  However, the control unit 20 stores the recording data 9 in the semiconductor memory 27 in the order received from the local recording device 12. As described above, in the local HDD 127 of the local recording device 12, the recorded data 9 is stored in the time series order of the recording time, that is, in a state where I frames and P frame groups are alternately arranged. For this reason, the I frame and the P frame group are alternately transmitted from the local recording device 12. Since the control unit 20 records the recording data 9 in the semiconductor memory 27 in the order of reception, the recording data is recorded in the semiconductor memory 27 in the same state as the local HDD 127, that is, in a state where I frames and P frame groups are alternately arranged. 9 is memorized.

  On the other hand, the control unit 20 stores the recorded data 9 once stored in the semiconductor memory 27 in the auxiliary HDD 26. However, here, the control unit 20 divides the recording data 9 at predetermined time intervals (for example, every hour) with respect to the recording time, and a plurality of I frames included in the same division are assigned to the first area A1 of the auxiliary HDD 26. While recording, a plurality of P frames included in the same section are recorded in the second area A 2 of the auxiliary HDD 26. That is, the I frame and the P frame are grouped for each section, and each is recorded in another area A 1 or A 2 of the auxiliary HDD 26.

  This process will be specifically described. Now, assume that the recorded data 9 is divided every hour, for example. In this case, if one GOP is composed of, for example, 15 frames (0.5 seconds), one segment of the recorded data 9 includes 7200 GOPs. Further, if one GOP is composed of, for example, 30 frames (1.0 second), 3600 GOPs are included in one segment of the recorded data 9. Thus, the number of GOPs included in one segment of the recorded data 9 is uniquely defined by the GOP frame unit. In the following description, it is assumed that n GOPs are included in one segment of recorded data 9. Here, as described above, one GOP includes one I frame and a P frame group including 14 P frames. Therefore, if n pieces of GOP are included in one segment of the recording data 9, n I frames I (1) to I (n) and n P frame groups P (1) to P are included in one segment. (N) is included together.

  When the I frame I (1) of the first GOP is stored in the semiconductor memory 27, the control unit 20 writes this in the auxiliary HDD 26 (arrow AR1).

  Subsequently, when the P frame group P (1) of the first GOP is stored in the semiconductor memory 27, the control unit 20 writes this in the auxiliary HDD 26 (arrow AR2). However, the control unit 20 does not write the P frame group P (1) of the first GOP continuously after the area where the I frame I (1) of the first GOP is written, but creates a blank area Bi of a predetermined size. Write from the position. The size of the blank area Bi is defined by “Bi = n * D1 + D2”. However, in this equation, “n” is the number of GOPs included in one segment of the recorded data 9, that is, the number of I frames included in one segment of the recorded data 9, as described above. “D1” is the data size of one I frame. However, here, it is assumed that the plurality of I frames included in the recorded data 9 are all the same data size “D1”. This is because an I frame is encoded without using inter-frame prediction unlike a P frame or the like, and therefore, one data size can always be regarded as equivalent to still image data (JPEG). “D2” is the size of an area provided as a margin between the storage area of the I frame (first area A1) and the storage area of the P frame (second area A2).

  When the second GOP I frame I (2) is stored in the semiconductor memory 27, the control unit 20 writes this in the auxiliary HDD 26 (arrow AR3). However, the control unit 20 continuously writes the I frame I (2) of the second GOP after the area where the I frame I (1) of the first GOP is written.

  Subsequently, when the P frame group P (2) of the second GOP is stored in the semiconductor memory 27, the control unit 20 writes this in the auxiliary HDD 26 (arrow AR4). However, the control unit 20 writes the P frame group P (2) of the second GOP continuously after the area where the P frame group (1) of the first GOP is written.

  Similarly, the control unit 20 subsequently writes the I frame at a position continuous with the I frame of the previous GOP, and the P frame group at a position continuous with the P frame group of the previous GOP. . Thereby, I frames (n I frames I (1), I (2),... I (n)) and P frames (n P frame groups P (1), P ( 2),... P (n)) are collected and recorded in different areas A1 and A2 of the auxiliary HDD 26 (see the auxiliary HDD 26 shown in FIG. 12).

<From auxiliary recording device 2 to local recording device 12>
Processing for rewriting the recorded data 9 from the auxiliary recording device 2 to the local recording device 12 will be described with reference to FIGS. 12 to 15 are diagrams showing data movement at each stage when the recorded data 9 recorded as the temporary saving data is written back from the auxiliary recording device 2 to the local recording device 12.

  Please refer to FIG. When the notification that the local HDD 127 has been restored is received from the local recording device 12, the control unit 20 of the auxiliary recording device 2 reads the recorded data 9 received from the local recording device 12 as temporary save data from the auxiliary HDD 26. To the local recording device 12. However, the control unit 20 transmits the recorded data 9 in the order stored in the auxiliary HDD 26. As described above, in the auxiliary HDD 26, the recording data 9 is composed of the I frame and the P frame for each division unit and is recorded in the separate areas A1 and A2. Therefore, first, the control unit 20 records I frames (n I frames I (1), I (2),... I (n) belonging to the same section) that are collectively recorded in the first area A1. Are transmitted to the auxiliary recording apparatus 2 in order. Further, when the control unit 20 transmits the I frame to the auxiliary recording device 2, the control unit 20 deletes the transmitted I frame from the auxiliary HDD 26.

  However, before transmitting each I frame, the control unit 20 sets the P frame that is continuous in time series with the I frame and the recording time (specifically, the P frame group P of the same GOP as the I frame). The information is added as additional information K, and the additional information K is added, and then the I frame is transmitted to the local recording device 12. Specifically, the information on the P frame group includes information (address information) for specifying in which area of the auxiliary HDD 26 the P frame group is stored, the data size of the P frame group, This is the GOP number to which the P frame group belongs.

  When receiving the I frame transmitted from the auxiliary recording device 2 (specifically, the I frame to which the additional information K is added), the control unit 10 of the local recording device 12 restores the received local I / F to the local HDD 127. Write to.

  This process will be specifically described. When receiving the I frame I (1) of the first GOP, the control unit 10 writes this in the local HDD 127 (arrow AR11).

  Subsequently, when receiving the I frame I (2) of the second GOP, the control unit 10 writes this in the local HDD 127 (arrow AR12). However, the control unit 10 does not write the I frame I (2) of the second GOP continuously after the area where the I frame I (1) of the first GOP is written, but instead of the blank area Bp (1 ) Write from the position where it was placed. The size of this blank area Bp (1) is the data size of the P frame group that is continuous in time series with the I frame (1) of the first GOP and the recording time (that is, the data of the P frame group P (1) of the first GOP). Size). That is, the control unit 10 refers to the additional information K added to the I frame I (1) of the first GOP, specifies the data size of the P frame group P (1) of the first GOP, and is blank for that size. The I frame I (2) of the second GOP is written from the position where the region Bp (1) is placed.

  Subsequently, when receiving the I frame I (3) of the third GOP, the control unit 10 refers to the additional information K added to the I frame I (2) of the second GOP, and the P frame group P ( The data size of 2) is specified, and the I frame I (3) of the third GOP is written from the position where the blank area Bp (2) corresponding to the size is placed (arrow AR13).

  Thereafter, the control unit 10 similarly applies each I frame to a blank area having a size equal to the data size of the P frame group of the previous GOP after the area where the I frame of the previous GOP is written. Write from the position where you put. As a result, n I frames I (1), I (2),... I (n) belonging to the same section become blank areas Bp (1), Bp (2),... Bp (n). It will be recorded in a state where each is separated.

  FIG. 13 shows a state where all of the n I frames I (1), I (2),... I (n) belonging to the same section are written back to the local HDD 127. In this state, it can be seen that a large continuous free space is formed in the auxiliary HDD 26. This is because when the temporarily saved recording data 9 is stored in the auxiliary HDD 26, a plurality of I frames belonging to the same section are recorded together in the first area A1.

  In this state, of the recorded data 9 temporarily saved, only the I frame is written back to the local HDD 127 prior to the P frame. As described above, the I frame is completed by itself, and is data that can restore the original frame image only by the information of the I frame. Therefore, if these I frames are restored, the outline of the recorded data 9 can be grasped. That is, at this stage where only the I frame is written back, it is possible to reproduce the recorded data 9 only on the local recording device 12 side without waiting for the P frame to be written back.

  Refer to FIG. The control unit 20 of the auxiliary recording device 2 records I frames (n I frames I (1), I (2),... I (n) belonging to the same section) recorded together in the first area A1. ) Are transmitted to the auxiliary recording device 2, and subsequently, P frame groups (n P frame groups P (1), P (2), ... (P (n)) are transmitted to the auxiliary recording device 2 in order. More specifically, 15 P frames included in each P frame group are sequentially transmitted to the auxiliary recording apparatus 2. In addition, when the control unit 20 transmits the P frame to the auxiliary recording device 2, the control unit 20 deletes the P frame that has been transmitted from the auxiliary HDD 26.

  On the other hand, when the P frame group transmitted from the auxiliary recording device 2 is received (more specifically, when 15 P frames included in each P frame group are received in order), the control unit 10 of the local recording device 12. Writes the received P frame to the restored local HDD 127.

  This process will be specifically described. When receiving the P frame group P (1) of the first GOP, the control unit 10 designates this as a blank area Bp between the I frame I (1) of the first GOP and the I frame I (2) of the second GOP. Write to (1) (arrow AR21). As described above, since the size of the blank area Bp (1) matches the data size of the P frame group P (1) of the first GOP, when the P frame group P (1) of the first GOP is written, In the local HDD 127, the first GOP I frame I (1), the first GOP P frame group P (1), and the second GOP I frame I (2) are successively recorded in this order. It should be noted that which GOP belongs to the received P frame group is specified by referring to the additional information K added to each previously acquired I frame.

  Subsequently, when receiving the P frame group P (2) of the second GOP, the control unit 10 converts this between the I frame I (2) of the second GOP and the I frame I (3) of the third GOP. Write in the blank area Bp (2) (arrow AR22).

  Subsequently, when receiving the P frame group P (3) of the third GOP, the control unit 10 converts this between the I frame I (3) of the third GOP and the I frame I (4) of the fourth GOP. Write in the blank area Bp (3) (arrow AR23).

  Thereafter, the control unit 10 similarly writes each P frame group in a blank area placed after the area where the I frame of the same GOP is written. As a result, n P frame groups P (1), P (2),... P (n) belonging to the same section become n I frames I (1), I (2) belonging to the section. ,... I (n) are sequentially recorded.

  N I frames I (1), I (2),... I (n) belonging to the same section and n P frame groups P (1), P (2),. FIG. 15 shows a state where all of the above are written back to the local HDD 127. In this state, it can be seen that a large free space is formed in the auxiliary HDD 26. This area is used again to record the recorded data 9 transmitted as temporary save data.

  In this state, the recording data 9 temporarily stored in the auxiliary HDD 26 as temporary save data is alternately arranged in the local HDD 127 in chronological order of recording times, that is, I frames and P frame groups. It is written back in the state.

<3-2. Processing for recording management information 90>
As described above, in the monitoring system 100, the management information 90 of the local HDD 127 of the local recording device 12 included in each of the plurality of local management systems 1 is doubly protected in each local HDD 127 (see FIG. 5), and further supplemented. Backed up in the HDD 26 (see FIG. 5). That is, the management information 90 is protected in triplicate.

  By the way, as described above, the management information 90 of the local HDD 127 is updated every time the recorded data 9 is newly recorded in the local HDD 127. Therefore, the management information 90 stored in the auxiliary HDD 26 must be updated accordingly. An update process of the management information 90 stored in the auxiliary HDD 26 will be described with reference to FIGS. FIG. 16 is a diagram showing the flow of the update process of the management information 90. 17 to 18 are diagrams showing data movement in each stage when the management information 90 is updated.

  When the recorded data 9 is acquired from the image processing unit 124 (YES in step S31), the control unit 10 of the local recording device 12 temporarily stores the acquired recorded data 9 in the semiconductor memory 128. Then, the control unit 10 reads management information 90 (specifically, overall management information and block management information of a block to be written (hereinafter referred to as “target block”)) from the local HDD 127 and stores it in the semiconductor memory 128. Store (step S32). In the examples of FIGS. 17 and 18, it is assumed that the third block is the target block.

  Subsequently, the control unit 10 writes the recorded data 9 stored in the semiconductor memory 128 into a predetermined area of the target block in the local HDD 127 (step S33) (see step S13 and step S14 in FIG. 6). .

  When the recording data 9 is written to the local HDD 127, the control unit 10 subsequently sends management information 90 (specifically, overall management information and block management information of the target block) so as to correspond to the executed recording process. Update (step S34). However, here, the control unit 10 simultaneously updates the two pieces of management information 90 stored in the local HDD 127 and the management information 90 stored in the semiconductor memory 128 (FIG. 17).

  When it is confirmed that the update of each management information 90 has been completed (YES in step S35), the control unit 10 continues to update the management information 90 (specifically, the integrated management information after the update, and The updated block management information of the target block is transmitted to the auxiliary recording device 2 (step S36). In addition, when the updated management information 90 is transmitted to the auxiliary recording device 2, the control unit 10 deletes the management information 90 stored in the semiconductor memory 128 (step S37) (FIG. 18).

When the management information 90 transmitted from the local recording device 12 is received (YES in step S301), the control unit 20 of the auxiliary recording device 2 stores the received management information 90 in the semiconductor memory 27.
Are written into the auxiliary HDD 26 (step S302). As a result, the management information 90 (specifically, the overall management information and the block management information of the target block) stored in the auxiliary HDD 26 is updated to the latest state (FIG. 18).

  According to the above processing, the latest management information 90 is being updated (that is, from the start of recording of the recorded data 9 to the local HDD 127 until the update of the management information 90 related to the recording is completed). ) Is backed up in the semiconductor memory 128. On the other hand, in other time zones, the latest management information 90 is backed up by the auxiliary HDD 26 of the auxiliary recording device 2.

<4. effect>
According to the monitoring system 100 according to the above embodiment, the local recording device 12 that records and manages the recording data 9 is connected to the auxiliary recording device 2 via the network N, and the auxiliary recording device 2 is connected to the local recording device. By temporarily storing the recording data 9 acquired from 12, the recording management of the recording data 9 in the local recording device 12 is assisted. According to this configuration, the reliability of recording management can be improved as compared with the case where the local recording device 12 performs recording management of the recorded data 9 alone in each local management system 1.

  In particular, the monitoring system 100 according to the above embodiment includes a plurality of local management systems 1. That is, the auxiliary recording device 2 is shared by a plurality of local recording devices 12. According to this configuration, it is possible to efficiently improve the reliability of recording management in each local recording device 12 while suppressing the cost of the entire monitoring system 100.

  In particular, according to the monitoring system 100 according to the above-described embodiment, when an abnormality occurs in the local HDD 127, the recorded data 9 newly acquired until the local HDD 127 is restored is auxiliary recorded as temporary save data. The device 2 is transmitted and temporarily stored in the auxiliary HDD 26. According to this configuration, it is possible to guarantee the recording of newly recorded video data 9 while an abnormality has occurred in the local HDD 127.

  In particular, according to the monitoring system 100 according to the above-described embodiment, when the local HDD 127 is restored, the recorded data 9 acquired from when the abnormality occurred in the local HDD 127 until the restoration is recovered from the auxiliary HDD 26. The data is written back to the restored local HDD 127. According to this configuration, after the local HDD 127 is restored, the recorded data 9 is recorded and managed again only on the local recording device 12 side, so that the complexity of managing the recorded data 9 can be avoided.

  In particular, according to the monitoring system 100 according to the above-described embodiment, the control unit 20 of the auxiliary recording apparatus 2 records video data in which I frames and other frames (P frames in the above embodiment) are mixed. 9 is recorded in the auxiliary HDD 26, a plurality of I frames and a plurality of P frames belonging to the same section are recorded together in different areas A1 and A2, and the recorded data 9 recorded in the auxiliary HDD 26 is recorded locally. When transmitting to the recording apparatus 12, it transmits in order of I frame and P frame. Since the I frame does not use inter-frame prediction, it can be reproduced independently. Therefore, the local recording device 12 can grasp the outline of the recording contents of the recording data 9 when only the I frame is received.

  In particular, according to the monitoring system 100 according to the above embodiment, when the control unit 20 of the auxiliary recording device 2 transmits the recording data 9 recorded in the auxiliary HDD 26 to the local recording device 12, the I frame and the P frame. Are transmitted in this order, and the transmitted frames are sequentially deleted from the auxiliary HDD 26. Since the data size of the I frame is larger than that of the P frame, according to this configuration, it is possible to secure a large continuous free space in the auxiliary HDD 26 at an early stage. That is, it is possible to secure a temporary storage data storage area in the auxiliary HDD 26 at an early stage. In the auxiliary recording device 2, the temporary storage data is required to be stored in the auxiliary HDD 26 at an early stage when the temporary storage data is transmitted from the local recording device 12 at any timing and a sufficient capacity is required. If the possible area can be secured, the capacity of the auxiliary HDD 26 can be reduced. As a result, the cost of the monitoring system 100 can be suppressed. Note that the above configuration is particularly effective because the capacity required for the auxiliary HDD 26 will inevitably increase if more local management systems 1 are connected to the auxiliary recording device 2 in order to reduce the cost of the monitoring system 100. It is.

  In particular, according to the monitoring system 100 according to the above-described embodiment, the control unit 10 of the local recording device 12 mixes a plurality of separately received I frames and a plurality of P frame groups again along the recording time. The rearranged state is stored in the local HDD 127. According to this configuration, the recording data 9 can be appropriately managed in the form along the recording time in the local HDD 127.

  In particular, according to the monitoring system 100 according to the above-described embodiment, the control unit 20 of the auxiliary recording device 2 adds information on a P frame group that is continuous with the I frame in time series to each of the plurality of I frames. Since it is added as information K, the local recording device 12 can make a plurality of I frames and a plurality of P frames received separately rearranged smoothly along the recording time.

  In particular, according to the monitoring system 100 according to the above-described embodiment, the local recording device 12 includes the two local HDDs 127 and records the recorded data 9 in each of them. it can. In particular, when an abnormality occurs in at least one of the two local HDDs 127, the newly acquired recording data 9 until the local HDD 127 is restored is transmitted to the auxiliary recording device 2 as temporary save data, The data is temporarily stored in the auxiliary HDD 26 provided in the auxiliary recording device 2. Therefore, even if an abnormality occurs in any of the local HDDs 127, it is possible to guarantee recording of the recorded data 9.

  In particular, according to the monitoring system 100 according to the above embodiment, the management information 90 of the local HDD 127 included in the local recording device 12 is backed up by the auxiliary HDD 26 of the auxiliary recording device 2, so that it is stored in the management area of the local HDD 127. Even if the access to 1272 becomes inaccessible, the management information 90 of the local HDD 127 can be acquired.

  In particular, while the management information 90 is being updated, the latest management information 90 is backed up in the semiconductor memory 128 provided in the local recording device 12. If the management information 90 backed up in the auxiliary HDD 26 is updated in real time, the management information 90 recorded in the local HDD 127 and the management information recorded in the auxiliary HDD 26 are affected by the delay of the network N or the like. There may be a time zone in which there is a discrepancy with 90. In addition, the load on the network N also increases. On the other hand, according to the configuration of the monitoring system 100 according to the above-described embodiment, the management information 90 being updated is backed up by the semiconductor memory 128, so that it is not affected by the delay of the network N, etc. Further, the latest management information 90 can always be backed up and held without imposing a load on the network N.

<5. Modification>
In the above embodiment, the local recording device 12 includes the two local HDDs 127 and the RAID1 system is realized using these. However, in the local recording device 12, the RAID1 system is not necessarily realized. It does not have to be.

  In the above embodiment, the monitoring system 100 includes a plurality of local management systems 1. However, the local management system 1 may be one. That is, the local management system 1 and the auxiliary recording device 2 may correspond one-to-one.

  In the above embodiment, the auxiliary recording device 2 may include a plurality of auxiliary HDDs 26.

  In the above embodiment, the management information 90 is duplicated in the local HDD 127 by duplicating the management area. However, duplication of the management area is not necessarily required.

  In the above embodiment, the recording data 9 is encoded into the I frame and the P frame in order to simplify the description. However, the recording data 9 is encoded into the I frame, the P frame, and the B frame. May be. In this case, the recorded data 9 is composed of a frame group in which I frames, B frames, and P frames are mixed. Alternatively, it is composed of an I frame, a P frame group, and a B frame group.

  In the above embodiment, the control unit 20 of the auxiliary recording device 2 rearranges the frames included in the recording data 9 when storing the recording data 9 from the semiconductor memory 27 to the auxiliary HDD 26. However, in the semiconductor memory 27, the I frame and the P frame group are sorted and rearranged in the order in which the I frame and the P frame are grouped for each section, and the rearranged recording data 9 is stored in the auxiliary HDD 26 as it is. It is good also as composition to do.

DESCRIPTION OF SYMBOLS 1 Local management system 2 Auxiliary recording device 9 Recorded data 11 Surveillance camera 12 Local recording device 13 Image | video reproduction apparatus 26 Auxiliary HDD
90 Management information 127 Local HDD
127 Semiconductor memory

Claims (6)

One or more recording management devices for acquiring imaging data acquired by the imaging means as recording data and recording and managing the recording data;
An auxiliary recording device connected to the one or more recording management devices via a communication line;
With
Each of the one or more record management devices is
A first storage device for storing the recorded data;
First control means for controlling writing and reading of data to and from the first storage device;
With
The auxiliary recording device is
A second storage device for storing the recording data acquired from the one or more recording management devices;
Second control means for controlling writing and reading of data to and from the second storage device;
With
The second control means comprises:
By temporarily storing the recording data acquired from the one or more recording management devices in the second storage device, the recording management of the recording data in the recording management device is assisted ,
The first control means comprises:
When an abnormality occurs in the first storage device, the recording data newly acquired until the first storage device is restored is transmitted as temporary save data to the auxiliary recording device,
The second control means comprises:
Obtaining the recording data transmitted as the temporary saving data from the one or more recording management devices, and temporarily storing the recording data in the second storage device;
When the first storage device included in any of the one or more recording management devices is restored, the recording data acquired from the recording management device and stored in the second storage device is read out, and the recording To the management device,
The first control means comprises:
Storing the recording data received from the auxiliary recording device in the first storage device;
The recording data acquired by the recording management device is:
It is time-series data obtained along the recording time. The recording data includes a first type frame obtained by encoding an image signal in a frame without using inter-frame prediction, and an image of a frame using inter-frame prediction. A second type frame encoded with a signal is included,
The second control means comprises:
When the recording data transmitted as the temporary save data is acquired from the recording management device, the recording data is divided at predetermined time intervals with respect to recording time, and a plurality of the first type frames included in the same division Are recorded in the first storage area of the second storage device, and a plurality of the second type frames included in the same section are recorded in the second storage area of the second storage device,
When the recorded data stored in the second storage device is read out and transmitted to the recording management device, the plurality of first type frames recorded in the first storage area are first transmitted and transmitted. Erasing the plurality of first type frames from the second storage device, and subsequently transmitting the plurality of second type frames recorded in the second storage area and transmitting the plurality of second type frames transmitted to the second storage area A recorded data recording management system for erasing from the second storage device . The recorded data recording management system according to claim 1,
A recorded data recording management system comprising a plurality of the recording management devices.   The recorded data recording management system according to claim 1 or 2,
  The first control means comprises:
  In the first storage device, the plurality of first type frames and the plurality of second type frames received separately from the auxiliary recording device are mixed again and rearranged along the recording time. Recorded data recording management system for storing.   The recorded data recording management system according to claim 3,
  The second control means comprises:
  The recording management device adds information of a second type frame that is continuous in time series with respect to the first type frame and recording time to each of the plurality of first type frames stored in the first storage area, Recorded data recording management system to send to.   The recorded data recording management system according to any one of claims 1 to 4,
  Each of the one or more record management devices includes a plurality of the first storage devices,
  The first control means comprises:
  If no abnormality has occurred in any of the plurality of first storage devices, the newly acquired recording data is recorded in each of the plurality of first storage devices,
  When an abnormality occurs in at least one of the plurality of first storage devices, an abnormality occurs in the recording data newly acquired until the first storage device in which the abnormality occurs is restored. A recorded data recording management system for storing in a first storage device that is not stored, and transmitting to the auxiliary recording device as temporary saving data.   The recorded data recording management system according to any one of claims 1 to 5,
  Each of the one or more record management devices is
  A third storage device which is a volatile storage device;
With
  The first storage device holds management information corresponding to the recording data recorded in the device itself,
  The first control means comprises:
  When the management information is updated by writing the recording data to the first storage device, the management information being updated is stored in the third storage device, and the recording data is written. Is completed and the update of the management information is completed, the updated management information is transmitted to the auxiliary recording device,
  The second control means comprises:
  A recorded data recording management system for acquiring the updated management information from the one or more recording management devices and storing the updated management information in the second storage device.

Images