KR20180003266A - CCTV image data extraction methods stored on the hard disk - Google Patents

Abstract

The present specification relates to a method for extracting CCTV image data stored on a hard disk, and more particularly, to a method for extracting CCTV image data stored on a hard disk, which includes: a block management information analysis step of analyzing block management information of the hard disk including at least one block in which image data is stored; an image data check step of checking whether there is the image data after the block management information analysis step; and an extraction step of extracting the image data by checking the image data in the block after the image data check step. According to the present invention, the CCTV image data stored on the hard disk can be quickly extracted without a digital video recorder (DVR) device.

Description

[0001] The present invention relates to a method for extracting CCTV image data stored on a hard disk,

[0001] The present invention relates to a method of extracting CCTV image data stored in a hard disk, and more particularly, to a method of extracting CCTV image data from a digital video recorder (DVR) device by detecting a data structure in which CCTV image data is stored, The present invention relates to a CCTV image data extraction method and a CCTV image data extraction method.

Currently, the CCTV system uses a method of storing video data recorded using a DVR device. When a DVR device is connected to an analog camera, the video data is digitized and stored in a hard disk. In the case of a digital camera, Save it to your hard disk.

 The DVR device is equipped with a hard disk for storing video data, and can search for and reproduce an image of a desired time in the entire video recording file.

Generally, in order to extract video data recorded in CCTV, a method of extracting video data by connecting a USB storage device to a DVR device or an NVR (Network Video Recorder) device is used. However, due to the capacity limitation of the USB storage device and the speed limit of the USB device, when extracting a large amount of CCTV image data, it is necessary to repeatedly perform image data extraction operation repeatedly, and the extraction time is very long.

In addition, a DVR device is required to extract video data recorded in CCTV, but in most crime scenes, only a hard disk is obtained as evidence. DVR devices store video data on a hard disk using different file structures for each manufacturer. Therefore, if only a hard disk is secured, it can be restored only by submitting it to the manufacturer of DVR device or by requesting the National Institute of Scientific Investigation. However, in case of domestic products, it is difficult to get help if the company is unable to provide technical support due to closure of business or closure of business. In case of overseas products, it takes a long time to receive technical support. It is also difficult for an individual to refer to the National Institute of Scientific Investigation.

Published Patent Application No. 10-2011-0066344 (Jun. 17, 2011)

The present invention has been devised in order to solve the above problems, and it is an object of the present invention to provide a method for solving the problem of the capacity limit of the USB storage device and the speed limit of the USB device when the USB storage device is used to extract the CCTV image data .

Also, it is an object of the present invention to provide a method for directly extracting image data from a computer without a DVR device even if only a hard disk storing CCTV image data is secured.

A block management information analysis step of analyzing block management information of a hard disk including at least one block in which image data is stored; An image data checking step of checking presence or absence of the image data after the analyzing step; And checking and extracting the image data in the block after the checking step.

Wherein the block management information analysis step comprises: checking whether the block is used; Reading the block management information; And checking the time information of the image data.

Wherein the image data checking step comprises: receiving information inputted by a user; And confirming the validity of the received information, wherein the received information is start time, end time, and camera number information of the image data.

The step of verifying the validity of the received information may determine whether the video data corresponding to the received information exists in the block.

Wherein the extracting of the image data comprises: identifying the block in which the image data is stored; Listing the identified blocks; Checking the identified intra-block video index; Confirming a position of the image data to be extracted; And extracting the image data.

The step of confirming the position of the image data may identify the position of the Kth image data in the image data area corresponding to the data of the Kth image index in the image index area.

According to the present invention, when extracting the CCTV image data stored in the hard disk, it is possible to directly extract the CCTV image data through the computer without connecting the USB storage device to the DVR device. Therefore, It has the effect of drastically improving the time-consuming problem.

In addition, CCTV image data can be extracted without a corresponding DVR device if the hard disk is secured as evidence of a crime scene, thereby solving the difficulty of securing the same DVR device for image extraction and shortening the time to acquire evidence images have.

1 is a schematic flowchart of a method of extracting CCTV image data stored in a hard disk according to an embodiment of the present invention;
FIG. 2 is a flowchart of a block management information analysis step according to an embodiment of the present invention;
3 is a flowchart of a video data checking step according to an embodiment of the present invention;
4 is a flowchart of an image data extracting step according to an embodiment of the present invention;
5 is a block diagram of a block management information and a block in a hard disk according to an embodiment of the present invention;
FIG. 6 is a diagram showing a relationship between an image frame index and image data in one block according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Will be described in detail with reference to the portions necessary for understanding the operation and operation according to the present specification. In describing the embodiments of the present invention, description of technical contents which are well known in the technical field to which the present invention belongs and which are not directly related to the present specification will be omitted. This is for the sake of clarity without omitting the unnecessary explanation and without giving the gist of the present invention.

In describing the components of the present specification, the same reference numerals may be given to components having the same name, and the same reference numerals may be given to different drawings. However, even in such a case, it does not mean that the corresponding component has different functions according to the embodiment, or does not mean that it has the same function in different embodiments, and the function of each component is different from that of the corresponding embodiment Based on the description of each component in FIG.

1 is a flowchart illustrating a method of extracting CCTV image data stored in a hard disk according to an embodiment of the present invention.

Referring to FIG. 1, a method of extracting CCTV image data stored in a hard disk includes a block management information analysis step (S100), an image data confirmation step (S200), and a step of extracting image data (S300).

In order to facilitate a clear understanding of the present invention, the following description will be added.

Usually the CCTV system is a camera. DVR device. The DVR device is equipped with a hard disk for storing video data, and a video signal inputted by a camera is stored in a hard disk. In addition, the DVR device may receive information such as search and playback of video data from a user, and may play back an image corresponding to the input information

The hard disk manages the stored data by blocking. At this time, the hard disk includes a block information management area and N block areas, and a block management information area stores information on N blocks. Therefore, by analyzing the information stored in the block management information area, the information of the block can be confirmed. The specific structure of the hard disk is shown in FIG. 5, and a more detailed description will be given later.

As shown in FIG. 1, the block management information analysis step S100 is a step of identifying and analyzing the intra-block image data information using the information stored in the block management information area in the hard disk.

At this time, in the management information area of the hard disk, identification information for confirming whether the hard disk is initialized with respect to the operation of the DVR device, size and position information of the block used by dividing the hard disk in the unique file system, Start time information of the image data, presence / absence of image data of each block, and location information of the last image data are stored. Therefore, since the block management information area includes the time information of the image stored in each block, the time information of the image data stored in the block can be checked by analyzing the block management information (S100).

The image data checking step (S200) receives the information of the image data to be extracted from the user and verifies the validity of the received information.

The received information includes time information of camera data and camera number information, but is not limited thereto. The determination of the validity in step S200 may include checking whether the received information exists in the corresponding block.

Step S300 of extracting the image data is a step of extracting image data stored in the block by checking a block corresponding to the information received in step S200.

According to the present invention, only the image data to be extracted can be extracted without the DVR device.

2 is a flowchart of the block management information analysis step according to an embodiment of the present invention.

Referring to FIG. 2, the block management information analysis step S100 includes a step of checking whether a block is used (S110), a block management information reading step (S120), and a time information checking step of a video data (S130).

In the block use check step (S110), the information stored in the block management information area is checked to check whether or not the blocks in the hard disk are used. Since the information on the block is stored in the block management information area, the presence or absence of use of the block can be confirmed by checking the block management information area.

The block management information reading step (S120) reads other information of the image data stored in the block. The block management information area includes additional information for managing the image data stored in the block. Therefore, by reading the block management information, it becomes possible to read other information of the video data. If it is determined in step S110 whether or not the block is used, the management information of the image data stored in the block is read in step S120.

The step of checking the time information of the image data (S130) is a step of checking the time information of the image data stored in the block in the block management information area. The time information of the image data stored in the hard disk may be checked. The time information may include a start time and an end time of the image data.

In the present invention, it is checked whether or not the intra-block image data exists as described above (S110), and other information necessary for intra-block image management is read (S120), and the time information of the image data stored in the block is additionally confirmed, (S130) It is possible to check how many blocks the video of a specific time zone is stored.

FIG. 3 is a flowchart of the image data checking step according to the embodiment of the present invention.

Referring to FIG. 3, the image data checking step S200 includes receiving a start time, an ending time, and a camera number of the image data (S210) and confirming the validity of the received information (S220).

The step S210 of receiving the time information and the camera number of the image data is a step of receiving information of the image data to be extracted by the user.

In this case, the method may further include receiving information of the image data to be extracted from the user (not shown).

In addition, the received information includes start time information, end time information, and camera number information of the video data, but is not limited thereto.

The step of verifying the validity of the data (S220) is a step of checking whether or not the time domain of the image data input by the user exists in the corresponding block.

In this case, if the image data information corresponding to the received information is not present in the block, step S210 of receiving the time information and the camera number of the image data may be performed again (not shown) (not shown).

4 is a flowchart of an image data extracting step according to an embodiment of the present invention.

Referring to FIG. 4, the image data extraction step S300 includes a step S310 of checking a block in which image data is stored, a step S320 of listing a block in which image data is stored, A step S340 of confirming the position of the image data, and a step S350 of extracting the in-block image data.

In operation S310, a block in which the image data is stored is checked in step S310. Since the time information of the block is stored in the block management information area, the position of the block storing the video data corresponding to the received information can be easily determined by analyzing only the block management information area without directly checking the data stored in each block You can browse and access.

A step S320 of listing up the blocks storing the image data is to find and arrange the blocks corresponding to the received information.

The step S330 of confirming the intra-block image index is a step of confirming the information stored in the image index area to find the position of the image data corresponding to the information received in the list-up block.

The block is repeatedly divided into the video index area and the video data area. That is, an image index area and a data area corresponding to the image index area exist in one block, and such a group exists repeatedly. In the video index, information including camera number, time information, and frame number is stored for each frame of video data stored in the corresponding block. If the video index is checked, the position of the video data can be grasped, and the video of the time zone corresponding to the received information can be extracted.

The step S340 of confirming the position of the image data is a step of confirming the position of the image data through the information confirmed in the step S330. In this case, the image index area and the image data area correspond to each other in a one-to-one correspondence. In step S330, the position of the image data corresponding to the received information can be confirmed by checking the image index area.

The step of extracting the intra-block image data (S350) is a step of accessing the position of the image data area corresponding to the received information and extracting the image data.

According to the present invention, video data of a desired time period can be extracted in this manner, thereby effectively extracting image data in a short time without a DVR device.

5 is a block diagram of block management information and blocks in a hard disk according to an embodiment of the present invention.

Referring to FIG. 5, a block management information area is located at the top of the hard disk, and N blocks are sequentially located on the hard disk. Also, in one block, the video index area and the video data area are included, and the video index area and the video data area are repeatedly displayed.

In the block management information area, identification information for confirming whether or not the hard disk is initialized with respect to the operation of the DVR, size and position information of the block used by dividing the hard disk in the unique file system, Start time information, presence / absence of image data of each block, location information of a location where the last image data is stored, size information of an image data area capable of storing image data, and the like.

In the video index area, position information, time information, offset information, camera number, frame number, and the like of the video data stored in the video data area, which is information necessary for searching the video stored in the hard disk, are stored , And header information and video data specific to each DVR manufacturer are stored for each video data in the video data area.

In this structure, when image data is input from a camera, an image index is generated, and at the same time, image data is stored. All image index areas have the same size and all the image data areas have the same size. In addition, image data is stored in all areas of the hard disk, and then the image index and data are stored again from the beginning of the hard disk.

However, since there are various file structures including the example of FIG. 5, the block management information area, the video index area, and the video data area necessarily exist, The contents of the present invention can be applied to file structures of all DVR devices that can be divided into one area.

Since the time information of the image is included in the block management information area, it is possible to determine whether the time zone of the image to be extracted exists in the corresponding block through the block management information. In addition, since the length of images to be stored may vary depending on the number of cameras and the recording option, the length of image data that can be included in one block is not limited.

FIG. 6 is a diagram showing a relationship between an image frame index and image data in one block according to an embodiment of the present invention.

As shown in FIG. 6, the image header index area and the image data area are repeatedly displayed in one block. For example, the image data 1 region exists under the image header and the index 1 region, and the image data N region exists sequentially below the image header and the index N region.

Accordingly, the image frame index can correspond to the image data. For example, Nth image data existing in the image data area corresponding to the Nth image index in the image frame index area is found and checked, and Nth image data existing in the image data area corresponding to the data of the (N + 1) It is possible to extract image data by searching for +1 st video data.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or essential characteristics thereof. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (2)

A block management information analysis step of analyzing block management information of a hard disk including at least one block in which image data is stored;
An image data checking step of checking presence or absence of the image data after the analyzing step; And
And checking and extracting the image data in the block after the confirming step,
The block management information analysis step
Confirming whether or not the block is used;
Reading the block management information; And
And checking the time information of the video data. The method according to claim 1,
The image data checking step
Receiving information input by a user; And
And verifying the validity of the received information,
Wherein the received information is a start time, an end time, and a camera number information of the image data, and the step of verifying the validity of the received information includes checking whether the image data corresponding to the received information exists in the block Lt; / RTI &
The image data extracting step
Confirming the block in which the image data is stored;
Listing the identified blocks;
Checking the identified intra-block video index;
Confirming a position of the image data to be extracted; And
And extracting the image data,
Wherein the step of verifying the position of the image data is performed by checking the position of the Kth image data existing in the image data area corresponding to the data of the Kth image index in the image index area.

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