KR20130139163A - Video managing apparatus and method of surveillance systems - Google Patents

Abstract

An apparatus and a method for managing an image of a surveillance system are provided. The image management apparatus of a surveillance system according to an embodiment of the present invention includes: a first storage unit which stores image data which is provided from at least one camera; a second storage unit which stores copy data of the image data; and a control unit which stores the image data in the first storage unit in real time and copies and stores the image data which is stored in the first storage unit in the second storage unit. [Reference numerals] (210) Interface unit;(220) Control unit;(230) First storage unit;(240) Second storage unit;(400) Storage medium

Description

Video management apparatus and method of surveillance systems

The present invention relates to an apparatus and method for managing a video of a surveillance system, and more particularly, to separately implement an element for storage only and an element for playback, backup, and overwrite, thereby improving recording performance and reducing IO load of the surveillance system. The present invention relates to an image management apparatus and a method of a surveillance system.

Recently, video surveillance systems using surveillance cameras such as CCTVs are rapidly spreading. In such a surveillance storage system, a storage scheme allows data of a surveillance camera to be stored in real time through a network on a single physical hard disk drive or a logical hard disk drive. In addition, the recorded video can be checked using a client program, and the recorded video data can be backed up and stored in another storage medium.

1A is a conceptual diagram illustrating a storage operation of a conventional surveillance system, FIG. 1B is a conceptual diagram illustrating a backup operation of a conventional surveillance system, and FIG. 1C is a conceptual diagram illustrating a regeneration operation of a conventional surveillance system. .

In FIG. 1A, the conventional surveillance system 1 registers a recording schedule for storing surveillance image data acquired by the camera 2. Then, the hard disk 3 to store the monitored video data is designated. Then, the video data is stored in a file in chronological order on the hard disk 3 specified by the user. Then, when the designated hard disk 3 is full, the oldest data is found on the hard disk 3 and the old data is erased to store the latest data.

In FIG. 1B, a user sets a backup start time and an end time to find a file from a hard disk (3) in which image data is stored, and converts the file into another format so that another storage medium (4), for example, a DVD or an external hard disk can be used. Save the backed up data to USB, network drive. Here, the hard disk 3 is the same one hard disk 3.

In FIG. 1C, past stored data may be checked by finding and monitoring surveillance data stored in a hard disk 3 designated by a user and transmitting and playing the stored data to a client. Here, the hard disk 3 is the same one hard disk 3.

However, in the conventional monitoring system 1, one physical hard disk 3 performs a function of storing, reproducing, and backing up. One logical hard disk performed.

In order for a physical hard disk drive to achieve the best write performance, it also depends on the buffer size of the memory. Video data from the network is first stored in a buffer of memory through the NIC (Network Interface Card) and written to a file on the hard disk, but the processing speed of about 1 second is different. That is, due to the capacity of the memory and processing speed of the hard disk, a lot of data cannot be stored in the memory, and the hard disk cannot quickly take data from the memory. This shortcoming was initially overcome by attaching a plurality of hard disks. The write speed that one hard disk can theoretically handle is 100 MBytes, but data must be sequentially entered in 4K units without a read operation.

However, the surveillance system receives video data through the network, and the data coming in through the network has a delay, so it cannot receive data sequentially.

By the way, the write speed can be increased by using a plurality of hard disks. However, when a large number of hard disks are attached to each other, the speed that the CPU can process and the bus lines to the hard disks increase, which prevents data from being sent at the same time. Because the data must be sent to the hard disk by bus line, the speed may be reduced by 1 / N.

It not only always writes image data but also has playback and backup function and overwrite function, so it is writing the latest image data. It finds the old image data and sends it to the client. You must find it and erase it. Actuators on a single hard disk look for data to play, back up, save, or overwrite, reducing write speeds and causing wear and tear on the hard disk, shortening its lifespan.

In addition, if the hard disk cannot take the image data stored in the memory, an overflow of the memory occurs and the image data is lost. Thus, even if playback and backup occur at the same time, if you want to save the high quality set by the user without losing the video, you need to save up to 125Mbps on a single physical hard disk.

However, the conventional surveillance system 1 connects and stores many surveillance cameras using one surveillance system, reproduces stored images at the same time, and backs up to keep the monitored data longer. When the surveillance camera data is stored in real time on one physical hard disk drive or logical hard disk drive, the performance of the surveillance system is degraded due to the hard disk processing speed, the decrease in the writing speed due to playback and backup, and the memory shortage. A problem arises.

Japanese Patent Laid-Open No. 2003-153177

The present invention is to solve the above problems, in the existing monitoring system at the same time stored in a plurality of hard disks, backup, playback and overwrite the old data, but for better performance only elements for storage (using a hard disk, etc.) The present invention provides a video management apparatus and method for a surveillance system that reduces the IO load of an element by sharing elements of each element (using a hard disk, etc.) for playback, backup, and overwriting.

In addition, reducing the IO load of the element allows the element to be stored only to store the image data without loss, while an element that backs up, plays back, and overwrites more image data to the client, allowing other Provided are an image management apparatus and method for a surveillance system that can back up to a storage medium.

Problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to one or more exemplary embodiments, an apparatus for managing an image of a surveillance system includes: a first storage unit configured to store image data provided from at least one camera; A second storage unit storing copy data of the image data; And a control unit storing the image data in the first storage unit in real time, and copying the image data to the second storage unit by the threshold value when the image data stored in the first storage unit is greater than or equal to a preset threshold. It includes.

In addition, the image management method of the surveillance system according to an embodiment of the present invention for achieving the above object, the step of recording the image data provided from the camera to the first storage medium in real time; If the image data stored in the first storage unit is greater than or equal to a preset threshold, storing copy data of the recorded image data corresponding to the threshold value on a second storage medium; Overwriting the copy data in the copied order when the remaining capacity of the second storage medium is insufficient; And retrieving the latest image data from the first storage medium and retrieving the old image data from the second storage medium when the user requests a reproduction.

Other specific details of the invention are included in the detailed description and drawings.

According to the present invention, a storage medium such as a hard disk for storage only and a storage medium such as a hard disk for playback, backup and overwriting can share respective functions to reduce the IO load of the storage medium such as hard disk. .

In addition, the storage media such as the hard disk can be configured for each function to store the image data without loss on the storage media such as the hard disk, and the storage media such as the hard disk for backup, playback and overwriting can store more image data. You can send it to the client and back it up to another storage device at a faster rate.

1A is a conceptual diagram illustrating a storage operation of a conventional monitoring system.
1B is a conceptual diagram for explaining a backup operation of a conventional monitoring system.
1C is a conceptual diagram for explaining a reproducing operation of a conventional monitoring system.
2 is a block diagram of an image management apparatus of a surveillance system according to an embodiment of the present invention.
3 is a conceptual diagram illustrating an operation of an image management apparatus of a surveillance system according to an embodiment of the present invention.
4 is a flowchart of an image management method of a surveillance system according to an embodiment of the present invention.
5 is a detailed flowchart of a backup operation of a video management method of a surveillance system according to an exemplary embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used in a sense that can be commonly understood by those skilled in the art. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

2 is a configuration diagram of an image management apparatus of a surveillance system according to an embodiment of the present invention, and FIG. 3 is a conceptual diagram illustrating an operation of an image management apparatus of a surveillance system according to an embodiment of the present invention.

The surveillance system includes at least one camera 100, an image management apparatus 200 (hereinafter, referred to as an image management apparatus), a display apparatus 300, and a separate external storage medium 400 of the surveillance system.

The video management apparatus 200 may include an interface unit 210, a controller 220, a first storage unit 230, and a second storage unit 240.

The camera 100 includes one or more images, and acquires an image and transmits the image data to the image management apparatus 200 through the interface unit 210 of the image management apparatus 200.

The first storage unit 230 stores the image data acquired by the camera 100 and transmitted through the interface unit 210. That is, the first storage unit 230 operates with the storage of the image data as a priority, and is a space in which the image data provided from the camera 100 is stored in real time.

The second storage unit 240 stores copy data of the image data stored in the first storage unit 230. That is, the second storage unit 240 operates by copying image data as a first priority, and is a space in which image data provided from the camera 100 is delayed in time and stored indirectly. Particularly, when the copy data stored in the second storage unit 240 is equal to or larger than a preset threshold when the image data stored in the first storage unit 230 is equal to or larger than the preset threshold value, the first storage unit 230 stores the copy data. Image data is copied and stored in the second storage unit 240.

Here, the first and second storage units 230 and 240 are preferably one of a hard disk or a solid state disc (SSD). Of course, it will be apparent to those skilled in the art that the hard disk or SSD may be another storage medium capable of storing data. In addition, the first and second storage units 230 and 240 may each be one or more spaces, logically and physically. For example, the first storage unit 230 may be formed of two hard disks, and the second storage unit 240 may be formed of one hard disk. In addition, when the SSD is used as the first storage unit 230, the performance of two hard disks may be achieved by one SSD.

Generally, hard disks are widely used, but SSDs are expected to be used in the future. SSDs offer faster read / write speeds than 230 MB / s hard disks, with no read / write heads and actuator arms that require data to be found on the platters, as with hard disk drives, but are currently used in large capacities. SSDs are about $ 3 per gigabyte, which is more expensive than capacity. Hard disk drives are 10 cents to 20 cents per gigabyte on a 3.5-inch desktop drive and read / write speeds of 100 MB / s, making them affordable and cost-effective for today's mass storage media.

And, as will be described later, the first storage unit 230 is used for real time storage, the second storage unit 240 is used as a copy data storage space, accordingly the storage speed of the first storage unit 230 is second It is preferable to be faster than the storage speed of the storage unit 240.

The controller 220 stores the image data provided from the camera 100 in the first storage unit 230 in real time, and when the image data stored in the first storage unit 230 is greater than or equal to a preset threshold. Is copied to the second storage unit 240 by the threshold value and stored. That is, the controller 220 controls to store the image data in the real time storage space and the copy storage space.

In addition, the controller 220 may play back image data stored in the first storage unit 230 and back up to an external storage medium 400 of the image data, and copy the data stored in the second storage unit 240. Playback, backup of the copy data to an external storage medium 400, and overwrite of old copy data may be performed.

In detail, when the remaining capacity of the second storage unit 240 is insufficient, the controller 220 may overwrite the copy data in the order of copying. In addition, the controller 220 may overwrite only image data in which copy data is generated among the image data provided from the camera 100 in the first storage unit 230 in the order provided from the camera 100.

Since the first storage unit 230 stores the latest image data, and the second storage unit 240 stores the copy data of the old image data, the controller 220 stores the first image unit. In operation 230, the image data may be retrieved and reproduced, and the copied image data may be retrieved and reproduced in the second storage unit 240. The data retrieved from the first storage unit 230 and / or the second storage unit 240 is displayed on the display device 300.

In addition, in consideration of the storage capacities of the first storage unit 230 and the second storage unit 240, the controller 220 transmits the image data from the first storage unit 230 to the second storage unit according to a predetermined copy period. Copy to 240 is also possible. For example, in consideration of time taken by 50% of the storage capacity of the first storage unit 230, the image data stored in the first storage unit 230 is copied to the second storage unit 240. Image data can be deleted in the oldest order in time.

In addition, in consideration of the storage capacities of the first storage unit 230 and the second storage unit 240, the controller 220 may convert image data from the first storage unit 230 to the second storage unit 240. You can make one copy at a size. For example, copy 25% of the total storage capacity of the first storage unit 230 at one time and store it in the second storage unit 240, and copy the image data (the size of the data is the total storage capacity) 25%) can be deleted at a time.

In this case, the controller 220 may sequentially copy the image data from the first storage unit 230 to the second storage unit 240 by a preset threshold value. For example, when a hard disk is used as the first and second storage units 230 and 240, if a copy is made at the same time, the location of the file is frequently accessed, and thus the copy speed is slowed down, thereby saving loss in storing image data. Since it may occur, it is preferable to copy the image data sequentially. Similarly, the controller 220 may copy the image data one time at a time by a preset threshold from the first storage 230 to the second storage 240. That is, when the image data is copied by the threshold value, the first storage unit 230 does not copy the size of the threshold value from the first storage unit 230 to the second storage unit 240, but rather the threshold value by the first storage unit 230. One copy is made to the second storage unit 240.

In addition, the controller 220 may store image data of the first storage unit 230 and / or copy data of the second storage unit 240 on a separate external storage medium 400. In this case, the controller 220 may convert the image data of the first storage unit 230 and / or the second storage unit 240, and then transfer the image data to the external storage medium 400 for storage. Here, the separate external storage medium 400 may use one of a DVD, a CD, an external hard disk, a USB memory, and a network drive, and it will be apparent to those skilled in the art that other storage media are included. In addition, a plurality of separate external storage media 400 may be provided to separate a space for storing image data of the first storage unit 230 and a space for storing copy data of the second storage unit 240. Of course, it is not limited only to this.

Referring to FIG. 3, when a hard disk is used as the first storage unit and the second storage units 230 and 240, the hard disk A, which is the first storage unit 230, operates the data storage first and the second storage unit 2. The hard disk B, which is the storage unit 240, performs data copying first.

Hard disk A performs real-time storage, playback of recent video data, backup of recent video data (to another storage medium), and copy video data to hard disk B. The hard disk B plays back image data older than the video data stored on hard disk A, and backs up the video data stored on hard disk B (to another storage medium). Erasing performs an overwrite.

If you use the current hard disk and surveillance camera, let's look at the actual implementation. For example, assume two physical hard disks that support SATA 2's 7200rpm, 64MB buffer.

In the case of hard disk A, the storage function can store the latest surveillance data at a speed of up to 250Mbps from the surveillance camera. Preferably, in consideration of the buffer capacity of the hard disk, image data may be stored at a speed of up to 40 Mbps from the surveillance camera on the hard disk A. FIG. Currently, 125Mbps can be stored on one physical hard disk. 250Mbps on one hard disk is the standard for recording 10 3Mega surveillance cameras. The playback function allows you to play back video data stored on the latest A hard disk. Unlike the old one, it does not find and play the oldest data, so it does not put much load on the A hard disk. The backup function converts the image data stored in Hard Disk A to other storage media (DVD / CD, external hard disk, USB, network drive) and backs up.

The copy function periodically copies to the B hard disk. The copy function can be copied to the B hard disk at a copy cycle set by the user. When copying to B hard disk once, it should not exceed 2GByte and do not copy to B hard disk more than once. If you copy at the same time, the hard disk frequently accesses the location of the file, so the copy speed may be slower, resulting in loss of video data. If it is copied at the size of 2GByte at once, if it is saved at 250Mbps speed, it is stored on the hard disk as much as 32Bytes per second, and it takes 1 minute to copy 2GByte to the B hard disk, so as to save the latest image data, B hard disk Can be copied to Preferably, since the latest surveillance data is stored at a speed of 40 Mbps from the surveillance camera on the hard disk A, the hard disk can be copied from the hard disk A to the hard disk B at a size of 90 MBytes per second.

In the case of the hard disk B, the playback function is the same as the playback operation of the hard disk A, but since the date of the stored video data is older than the hard disk A, the old video data is searched for and played back. Assuming that the capacity of the hard disk B is 8TByte assuming that it is stored at 250Mbps, 7 days of data is stored and 7 days of data can be played back. The backup function can be backed up to other media (DVD / CD, external hard disk, USB, network drive) like the backup of hard disk A. The overwrite function allows you to save the latest image data to hard disk B but delete the oldest data when the latest image data is copied from hard disk A when the hard disk B is full and cannot be saved. It will be apparent to those skilled in the art that the present invention is not limited thereto.

In the future, if a cheaper, larger capacity SSD is available, it will be possible to use about 20 3Mega cameras in one surveillance system by using SSDs twice as fast as hard disks.

4 is a flowchart of a video management method of a surveillance system according to an embodiment of the present invention, and FIG. 5 is a detailed flowchart of a backup operation of the video management method of a surveillance system according to an embodiment of the present invention.

The video management method of the surveillance system (hereinafter, referred to as an "video management method") is obtained when the camera captures an external video (S510), records the data of the video on a first storage medium (S520), and the first If the image data stored in the storage medium is greater than or equal to a preset threshold, the copy data obtained by copying the image data stored in the first storage medium by the threshold value is stored in the second storage medium (S530). Therefore, the latest image data in time is stored in the first storage medium, and the old image data is stored in the second storage medium, respectively. Here, the first and second storage media may be one of a hard disk or a solid state disc (SSD), and the storage speed of the first storage medium exceeds the storage speed of the second storage medium. In addition, the first storage medium and the second storage medium may be at least one logically and physically. Preferably, the first storage medium may be two, and in operation S520, image data may be recorded at 200Mbps on the first storage medium. Since two first storage media are used, the video data recorded is 400 Mbps. When converted into bytes, 50 Mbytes of video is recorded per second, and 300 MBytes of files are copied to the second storage medium. It takes about 3 seconds to copy 300 Mbytes.

Thereafter, when the remaining capacity of the second storage medium is insufficient (S540), the copy data of the second storage medium is overwritten in the copied order (S550). Although it is possible to delete the image data immediately when the image data is copied in the first storage medium, it is preferable to overwrite only the image data in which the copy data is generated in the first storage medium in the order provided from the camera Do.

Then, if there is a playback request from the user, that is, if there is a video playback input (S560), the latest video data is retrieved from the first storage medium (S585), and the old video data is retrieved from the second storage medium (S580). Play the searched video. In this case, in order to reduce the time for searching the image data in time order, the storage medium for searching the image may be immediately identified based on whether the data is copied (S570). To this end, an event may be generated in the data in which the copy of the data is executed and used in the search.

In addition, image data of the first storage medium and / or copy data of the second storage medium may be backed up to another storage medium. Referring to FIG. 5, when the camera photographs and acquires an external image (S610), the image data is recorded on the first storage medium (S620), and the copy data of the image data stored on the first storage medium is stored on the second storage medium. After storing in S630, if there is a backup request from the user (S640), the image data of the first storage medium is converted and backed up to the third storage medium, and the copy data of the second storage medium is converted to fourth Can be backed up to storage media. Herein, the third and fourth storage media correspond to separate external storage media. As described above, the external storage medium may be a DVD / CD, an external hard disk, a USB, a network drive, or the like.

In addition, other storage media may be used, as well as RAID may be used as an example. Redundant Array of Independent Disks or Redundant Array of Inexpensive Disks (RAID) is a technology that divides and stores some redundant data on multiple hard disks . Also called a multiple array independent disk. There are various ways of dividing data, and these methods are called levels, which can satisfy various purposes, such as increasing the reliability of the storage device or improving the overall performance.

RAID combines multiple disks into a single logical disk, including hardware RAID, host RAID, and software RAID.

Software RAID refers to the use of RAID logic already built into the OS. There is no need for extra cost, but the operation required for RAID operation is closely related to the stability of the OS and the stability of the RAID by using the system's CPU. Thus, if the OS is unstable, the RAID volume also becomes unstable.

Host RAID takes the role of PHY / CPU by using iROC as the main chip, in which some engines are in H / W and others are in S / W.

Hardware RAID (PHY, CPU, Memory, and RAID engines) are independently supported on the mode controller, so there is little CPU burden on the motherboard, and they operate independently, resulting in high reliability.

 There are many RAID cards that come in internal / external versions that can be used in PCs. You can use RAID technology to speed up storage and make backups easier. In other words, using the RAID function increases the write and read speeds.

According to an exemplary embodiment of the present invention, in the existing surveillance system, the first storage medium for real-time storage of data obtained from the surveillance camera has been simultaneously stored, backed up, played, and overwritten to a plurality of hard disks. Hard disk, SSD, etc.), and a second storage medium (hard disk, SSD, etc.) that copies, stores, backs up, and overwrites real-time storage data can share the respective functions to reduce the IO load of the surveillance system. . Through this, the first storage medium (hard disk, SSD, etc.) can store the image data without loss, and the second storage medium (hard disk, SSD, etc.) that backs up, plays, and overwrites more image data. The first and second storage media (hard disk, SSD, etc.) can be backed up to other storage media at a higher speed.

On the other hand, the image management method of the surveillance system according to an embodiment of the present invention can be implemented as a module by software and hardware, the above-described embodiments of the present invention can be written as a program that can be executed in a computer, It can be implemented in a general-purpose computer for operating the program using a recording medium that can be read. The computer-readable recording medium is implemented in the form of a carrier wave such as a ROM, a floppy disk, a magnetic medium such as a hard disk, an optical medium such as a CD or a DVD, and a transmission through the Internet. In addition, the computer-readable recording medium may be distributed to a network-connected computer system so that computer-readable codes may be stored and executed in a distributed manner.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

100: camera
200: video management device of the surveillance system
210: interface unit 220: control unit
230: first storage unit 240: second storage unit
300: display device 400: external storage medium

Claims (15)

A first storage unit storing image data provided from at least one camera;
A second storage unit storing copy data of the image data; And
A control unit which stores the image data in the first storage unit in real time and copies and stores the image data to the second storage unit by the threshold value when the image data stored in the first storage unit is equal to or greater than a preset threshold value. A video management apparatus of a surveillance system, including. The method of claim 1,
And the controller is configured to overwrite the copy data in the order of copying when the remaining capacity of the second storage unit is insufficient. The method of claim 1,
And the controller is configured to overwrite only image data in which the copy data is generated in the first storage unit in the order provided from the camera. The method of claim 1,
The control unit is a video management apparatus of the monitoring system, the image data not copied from the image data is retrieved and reproduced in the first storage unit, the copy data is retrieved and reproduced in the second storage unit. The method of claim 1,
And the control unit copies sequentially by the threshold value. The method of claim 1,
And the control unit makes a copy of the threshold value once at a time. The method of claim 1,
The control unit converts the image data of the first storage unit and backs up to a separate storage medium, the image management apparatus of the surveillance system. The method of claim 1,
The control unit converts the copy data of the second storage unit and backs it up to a separate storage medium. 9. The method according to claim 7 or 8,
The separate storage medium is one of a DVD, a CD, an external hard disk, a USB memory, and a network drive. Recording image data provided from a camera to a first storage medium in real time;
If the image data stored in the first storage medium is greater than or equal to a preset threshold, storing copy data of the recorded image data on the second storage medium by the threshold value;
Overwriting the copy data in the copied order when the remaining capacity of the second storage medium is insufficient; And
And retrieving the latest image data from the first storage medium and retrieving old image data from the second storage medium when the user requests playback. The method of claim 10,
And capturing an external image by at least one camera. The method of claim 10,
The first and second storage media are one of a hard disk or a solid state disc (SSD), and the storage speed of the first storage medium exceeds the storage speed of the second storage medium. . The method of claim 10,
And overwriting only image data in which the copy data is generated in the first storage medium in the order provided from the camera. The method of claim 10,
Converting the image data of the first storage medium and backing up to a third storage medium. The method of claim 10,
Converting said copy data of said second storage medium and backing up to a fourth storage medium.

Images