KR100758090B1 - Method for recording image data in digital video recorder - Google Patents

Abstract

The present invention relates to a video information recording method of a digital video surveillance system, comprising the steps of converting and detecting motion information from video information acquired from a camera, and a data recording field of the digital video surveillance system according to the amount of motion information detected. Setting the number and recording the image information on the storage medium using the set number of fields. According to the present invention, it is possible to easily secure additional storage medium capacity by adjusting the number of fields of the image data recorded according to the motion information acquired through the camera.

Description

Video information recording method of digital video surveillance system {METHOD FOR RECORDING IMAGE DATA IN DIGITAL VIDEO RECORDER}

1 is a block diagram of a digital video surveillance system for performing a method according to the present invention;

2 is a flowchart illustrating a video information recording process of a digital video surveillance system according to a preferred embodiment of the present invention;

3 is a diagram illustrating a motion information table of FIG.

<Explanation of symbols for main parts of the drawings>

100: image acquisition unit 100/1 to 100 / n: camera

102: image multiplexer 104: display unit

106: digital image processing unit 108: digital image storage unit

110: control unit 112: field number classification table

114: motion information table

The present invention relates to a control technology of a digital video surveillance system, and more particularly, to a method of recording video information of a digital video surveillance system capable of efficiently securing a recording capacity of a digital video surveillance system to further secure a storage capacity of a storage medium. .

In general, a number of surveillance cameras, such as a camera, are installed around a place to be monitored since a system in which a person can monitor one by one in an environment where a constant environment must be constantly monitored, such as a financial institution or a public institution, is installed. Then, the surrounding environment is photographed in real time using the installed surveillance camera, the recorded data is recorded on the recording medium, and the recorded data is reproduced through the recording / reproducing device to determine whether or not something has happened at the place to be monitored. To judge.

However, monitoring the surrounding environment is a task that needs to be performed for a long time, and thus, when recording data recorded in real time through a camera on a recording medium in real time, there was a problem that the amount of data was enormous. Time Lapse method, which is a method, is used to partially record recording data input from a camera onto a recording medium. That is, the long time recording function can record for a long time by using a certain length of tape by appropriately setting the frame interval to record as needed, so the video signal input through a closed circuit camera such as a bank must be recorded for a long time. This is a useful feature if you do.

However, even if the recording data is intermittently recorded in a time lapse method, the storage capacity supported by the magnetic recording medium such as a cassette tape is limited, and thus there is a problem in that the magnetic recording medium must be frequently replaced for long time recording. In addition, there is a problem in the data storage capability of the magnetic recording medium due to the characteristics of the cassette tape such as deterioration of image quality and material deformation.

Recently, a digital video surveillance system, also known as a DVR (Digital Video Recorder), has been used to improve low-capacity, unclear image quality, and difficult management, which were disadvantages of the conventional analog surveillance system.

DVR is a device that converts video data input by analog surveillance camera into digital signal and saves much more by converting video tape, which is an existing storage medium, into hard disk or DVD loader. By compressing and restoring images, it is possible to store a lot of data of a long time / high definition with the improvement of media.

However, despite the advantage that the DVR can record a larger amount of data, there is still a need to secure enough storage capacity, and there is currently no technology for efficiently managing the recorded data of the DVR.

The present invention has been implemented in view of the above-mentioned limitations of the prior art, and the digital video surveillance system makes it possible to secure additional storage medium capacity by recording video data by adjusting the number of recording fields according to the motion information acquired through the camera. The purpose is to provide a method of recording.

According to a preferred embodiment of the present invention for achieving the above object, a video information recording method of a digital video surveillance system for recording video information acquired through a plurality of cameras to a storage medium, the motion information in the video information obtained from the camera Converting and detecting the data, setting the number of data recording fields of the digital video surveillance system according to the detected amount of motion information, and recording the video information on the storage medium with the set number of fields. Provided is a video information recording method.

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

1 is a block diagram of a digital video surveillance system for performing a method according to the present invention, which includes an image acquisition unit 100, an image multiplexer 102, a display unit 104, a digital image processing unit 106, and a digital image. The storage unit 108 includes a storage unit 108, a control unit 110, a field number classification table 112, and a motion information table 114.

The image acquisition unit 100 acquires an image of a place to be monitored through a plurality of cameras 100/1, 100/2, ..., 100 / n, and transmits the image to the image multiplexer 102.

The image multiplexer 102 multi-processes the images acquired by the plurality of cameras 100/1, 100/2, ..., 100 / n constituting the image acquisition unit 100 to the digital image processing unit 106. In addition, the multi-processed reproduction image of the plurality of channels transmitted from the digital image processing unit 106 is processed and transmitted to the display unit 104. In this case, the image multiplexer 102 may compress and process the acquired image at an arbitrary compression rate according to the present embodiment under the control of the controller 110.

The digital image processing unit 106 transfers the image data compressed from the image multiplexer 102 to the international image compression standard such as MPEG, to the digital image storage unit 108, and from the digital image storage unit 108. The transmitted image data is restored to a moving picture international compression standard used for image compression and transferred to the image multiplexer 102.

The digital image storage unit 108 receives the compressed image data from the digital image processing unit 106 according to the recording mode control signal of the controller 110 and stores the compressed image data in the digital recording medium, and reads the compressed image data from the digital recording medium. The digital image processing unit 106. The digital image storage unit 108 may be implemented by a known hard disk or DVD loader and a controller thereof.

The display unit 104 outputs a plurality of channels of reproduced images transmitted from the image multiplexer 102 through a monitor or the like.

The controller 110 outputs a mode control signal to the image multiplexer 102, the digital image processor 106, and the digital image storage unit 108 according to a mode selection command input by a user. In this case, the controller 110 controls the image multiplexer 102 to compress the acquired image to a predetermined compression rate according to the motion information of the image signal provided from the image multiplexer 102 according to the present embodiment.

The field number classification table 112 stores video field number information of a predetermined stage, and the motion information table 114 includes motion information that can be detected within a screen of image information acquired through the image acquisition unit 100. In order to distinguish the number of blocks of, for example, a total of 12 blocks are preset.

The detailed operation process of these tables 112 and 114 and the control unit 110 will be described in more detail in a flowchart to be described later.

Hereinafter, with reference to the above-described configuration, with reference to the flowchart of Figure 2 attached to the video information recording process of the digital video surveillance system according to a preferred embodiment of the present invention will be described in detail.

First, when the image information acquired through the image acquisition unit 100 is provided to the image multiplexer 102 (S200), the image multiplexer 102 converts the image information into motion information and provides it to the controller 110. (S202).

In step S204, the controller 110 searches the field number classification table 112 to determine whether there is a field number corresponding to the detected motion information, and if there is a field number corresponding to the detected motion information amount, the process proceeds to step S206. To set the number of fields.

These steps S204 and S206 will be described in more detail below.

First, in the field number classification table 112, the number of video fields is set in predetermined steps according to the present embodiment.

For example, the fields may be classified into six levels of "10 fields", "20 fields", "30 fields", "40 fields", "50 fields", and "60 fields" in the order of low order. ) Can be selected from any of these six steps.

The selection criteria for the number of fields classified as described above may be set according to the change rate of the motion information provided through the image multiplexer 102. In this case, the motion information is detected based on the motion information table 114.

3 is a diagram illustrating the motion information table 114 by way of example to determine how much motion information is detected in one screen of image information acquired by an arbitrary camera of the image acquisition unit 100.

If the motion information of the image acquired through the image acquisition unit 100 is detected within the range of the block? Of the motion information table of FIG. 3 (one motion block is detected), for example, the number of fields is " 10 " Field ", and the number of fields is set to" 20 field "when it detects within the block (1) and (2) range (when two motion blocks are detected).

When the acquired motion information is detected within the ranges of blocks ①, ②, ⑤, and ⑥ (four motion blocks are detected), the number of fields is set to "30 fields", and the acquired motion information is stored in the block ①. When detected within the range of (2), (3), (3), (5) and (6) (7 motion blocks are detected), the number of fields is set to "40 fields".

If the acquired motion information is detected within the ranges of blocks ①, ②, ③, ⑤, ⑥, ⑦, ⑨, ⑩, ((when nine motion blocks are detected), the number of fields is set to "50 fields". If the acquired motion information is detected within the ranges of blocks ①, ②, ③, ④, ⑤, ⑥, ⑦, ⑧, ⑨, ⑩, ⑪, ((twelve motion blocks are detected), the field Set the number to "60 fields."

In other words, if the motion is small, the detailed image is not necessary so that the number of fields is reduced. If the motion is large, more detailed images are required, so the field is set to be higher.

Therefore, in step S208, the number of fields may be set in various manners and recorded in the digital image storage unit 108 so that the recording space of the recording medium may be utilized more efficiently.

According to the present invention, it is possible to easily secure additional storage medium capacity by adjusting the number of fields of the image data recorded according to the motion information acquired through the camera.

As mentioned above, although this invention was demonstrated concretely based on the Example, this invention is not limited to such an Example, Of course, various deformation | transformation are possible for it within the technical idea and the scope of a claim mentioned later.

Claims (4)

A video information recording method of a digital video surveillance system for recording video information acquired through a plurality of cameras to a storage medium, Converting and detecting image information acquired from any one of the plurality of cameras into motion information; Setting the number of data recording fields per predetermined time of the digital video surveillance system according to the detection amount of the motion information; Recording the image information on the storage medium using the set number of fields. Image information recording method of a digital video surveillance system comprising a. The method of claim 1, The converting and detecting into the motion information may include: And detecting motion information for each block range existing in one screen of the image information acquired by the camera. The method of claim 1, The field number setting step, If the detection amount of motion information for each block range existing in one screen of the image information acquired by the camera is small, the number of fields per block time is set to a small number of fields, and the motion information for each block range existing in one screen of the image information acquired by the camera. The video information recording method of the digital video surveillance system, characterized in that if the detection amount of a large amount, the number of fields per predetermined time is set. The method of claim 3, wherein And the set number of fields is arbitrarily selected from a field number classification table classified into a total of six levels in descending order of field numbers.

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