KR20080101402A - Method for event outbreak of optimum image procure storage and dvr system which use the same - Google Patents

Abstract

A storing method for obtaining an optimum image according to an event and a DVR system using the same are provided to obtain an event generating interval when the event is generated and an image of high resolution from an event generation time to an event termination time, thereby easily grasping an actual spot. An image photographed by a camera is obtained. The image obtained above is buffered as much as a predetermined amount of time per a unit frame. It is checked whether an event is generated in the buffered image. When the generation of the event is not checked, the image is converted into low resolution and stored per a unit frame. When the generation of the event is checked, the image is stored from a time before the generation of the event to a time after the termination of the event.

Description

Method for event outbreak of optimum image procure storage and DVR system which use the same}

1 is a view showing an image storage method as an embodiment of a DVR system according to the prior art;

2 is a view showing an image storage method as another embodiment of a DVR system according to the prior art;

3 is a view showing an image storing method as another embodiment of a DVR system according to the prior art;

4 is a view showing an image storage method of the DVR system according to the present invention;

5 is a detailed view showing an image acquisition and storage process when an event occurs according to the present invention;

6 is a detailed view showing an image acquisition and storage process through a temporary unit frame when an event occurs according to the present invention;

7 is a flowchart of a storage method according to the present invention;

8 is a schematic diagram of a DVR system according to the present invention;

<Explanation of symbols for major symbols in the drawings>

1: unit frame

10 camera 20 buffer part

30 controller 40 encoder

50: video providing unit 51: storage

52: switch 53: decoder

54: display

The present invention relates to a storage method for securing an optimal image according to an event occurrence and a DVR system using the same, and more particularly, to easily determine the image acquired by the DVR system and to efficiently store the obtained image. The present invention relates to a storage method for securing an optimal image according to an event occurrence to increase the utilization of a storage space and a DVR system using the same.

Digital video recorder (DVR) is the hot spot in security surveillance based on digital video compression technology. The DVR is distinguished from the existing analog storage device (VCR), and the input image can be digitized and stored in a hard disk as a storage device.

The biggest advantage of DVR is that it does not require maintenance cost because it does not need periodic exchange and storage of recording tape unlike the existing analog method. In addition, it is possible to search quickly in case of an incident, obtain clear picture quality, and actively respond to the situation by receiving the video in real time through a network network using a telephone line or the Internet, even at a long distance. Therefore, unlike conventional analog (VCR) there is a functional superiority that can not be compared.

The DVR system installs a number of cameras in areas requiring security. It is mainly used to check the security status of buildings, parking lots, banks, airports, casinos, ports, hotels, prisons, etc. in real time. The use of DVR is similar to that of a general closed circuit (CCTV), but the operation method is very different from the digital method. In addition, closed-circuit television (CCTV) records the video captured by the surveillance camera with video tape and records and reads it through the VCR, whereas the DVR converts the video data inputted by the analog surveillance camera into a digital image, It is characterized by converting into digital video signal and storing it.

In general, the DVR system has used a method of reducing the image quality of the video data or reducing the number of recording fields of the video data in order to store a larger amount of video data on a hard disk of a constant capacity. In case of an emergency such as an alarm while recording in a low field number, a larger amount of video data is recorded using a high quality / high field number recording method.

1 to 3 is a view showing a storage method for storing image data in the DVR system according to the prior art.

1 has been using a method of storing a large amount of image data by lowering the resolution as much as possible, but due to the low resolution has a lot of restrictions on the use as a situation judgment or evidence.

Thus, as shown in FIG. 2, the acquired image was stored as high resolution image data. This has the advantage of easy situation determination when using the situation determination or evidence, but there is a problem that waste of storage space and a large maintenance cost due to the large capacity according to the high resolution.

In order to solve the above problems, the proposed technique is to store video data at low resolution in ordinary times, and to store the video data in high resolution when an event occurs, so that the situation determination on the event occurrence section can be easily performed.

However, since this method stores only high resolution from the time of occurrence to the end of the event, the situation before and after the event, which can be a crucial part in determining the situation, is stored at a low resolution, making it difficult to judge the situation. There was a following issue.

In order to solve the above problems, the present invention buffers the acquired image for each unit frame and checks whether or not an event occurs. When the event is not confirmed, the present invention converts and stores the image in low resolution and generates an event when the event is confirmed. We want to provide a DVR system that can easily analyze the situation before the event occurs and the event after the event ends when the situation is judged in high resolution by storing images from a predetermined time before and after the event end time. There is a purpose.

The present invention for achieving the above object, in the storage method for obtaining an optimal image according to the occurrence of the event for storing the image obtained from the DVR system, obtaining the image taken by the camera, the image Buffering the image acquired in the acquisition step by unit frame for a predetermined time, Checking whether the event occurs in the buffered image, If the event occurrence is not confirmed in the event occurrence check step, the image is stored in the buffered unit frame at a low resolution And converting and storing the event from the predetermined time before the event occurrence time to the predetermined time after the event end time when the event occurrence is confirmed in the event occurrence check step.

In a preferred feature according to the invention, the camera is a high resolution camera.

Another desirable feature according to the invention is characterized in that it comprises the step of converting the image immediately before the remaining time except the predetermined time before the event occurs when the event occurs to the low resolution.

According to another preferred embodiment of the present invention, the buffering step is characterized in that at least one temporary unit frame before the unit frame obtained through the camera is buffered together.

According to another preferred embodiment of the present invention, when an event occurs, the image of the high resolution acquisition section is not divided into unit frames.

Another preferred feature according to the invention is characterized in that it further comprises the step of storing at a high resolution one frame per predetermined interval when the event has not occurred.

According to another preferred aspect of the present invention, in the DVR system for securing the optimal image according to the occurrence of the event for storing the image obtained from the DVR system, the camera is installed at various sites to obtain the image, the camera A buffer that buffers the acquired image for each unit frame for a predetermined time, a controller which checks whether an event occurs in the image buffered by the buffer unit, changes to a low resolution when an event does not occur according to whether an event of the controller occurs, and when an event occurs Encoder converts the image in high resolution from a predetermined time before the event occurrence time to a predetermined time after the end of the event, and stores the high-resolution and low-resolution converted image according to the occurrence of the event through the encoder, and outputs and controls the necessary image by forming a network. Including an image providing unit The features.

According to another preferred feature of the present invention, the image providing unit, the storage is stored in the low-resolution or high-resolution converted image according to the event occurrence, the storage and the network is connected to the network, the image stored in the storage is output A switch for connecting to a plurality of display units, a decoder for converting an analog signal to output an image converted into a digital signal by the encoder to the display unit, and a video stored in the storage connected to the switch as needed Characterized in that it is configured to include a control unit for controlling to output by unit, by event, by date.

According to another preferred feature of the present invention, the camera is a high resolution camera.

According to another preferred feature of the present invention, the encoder includes a low resolution compression unit for compressing at low resolution when no event occurs and a high resolution compression unit for compressing at high resolution when an event occurs.

Hereinafter, with reference to the accompanying drawings will be described in detail the embodiment of the storage method and the DVR system using the same for securing the optimal image according to the event generation according to the present invention.

According to an embodiment of the present invention, a storage method for obtaining an optimal image according to an event occurrence includes obtaining an image through a camera (S10), buffering the acquired image for each unit frame for a predetermined time (S20), and buffering Checking whether the event occurs in the unit frame (S30), and if the event has not occurred in the event generation step (S30), storing the unit frame in a low resolution (S40) and the event occurrence check step ( In the case where an event occurs in S30, storing the image in high resolution from a predetermined time before the event occurrence time (secure period) to a predetermined time after the event end time (secure period) (S50), and storing the image stored through the above-described process. Characterized in that it comprises a step of monitoring (S60).

In addition, before the step of storing at a low resolution (S40) according to the occurrence of the event is not characterized in that it further comprises a step (S41) of storing at a high resolution one frame per predetermined interval.

4 is a view showing an image storage method of the DVR system according to the present invention.

As shown, the storage method according to the present invention increases the space efficiency by storing the image at a low resolution in normal times, and when the event occurs, it stores in high resolution from the event occurrence point to the end time point, but after a predetermined time before the event occurrence time Storage in high resolution as far as the main technical gist of the present invention.

Camera 10, which is a photographing means, is installed in a place where security is required such as a parking lot, an airport, a bank, and records various situations occurring in the field in real time, and analyzes the situation occurring on the site later, or records the acquired image for use as evidence data. Real time monitoring and storage through the system.

The image acquired by the camera 10 is transmitted and stored in real time through a network, and before storing, it is checked whether an event has occurred in the acquired image. Here, the event refers to a sudden situation of a scene photographed through the camera 10, for example, a sudden situation confusion due to the appearance of a robbery in an image obtained from a bank or a traffic accident scene occurring on a road. Talk about an unexpected situation.

The control unit 30 checks whether such an event has occurred, and if an event has not occurred, that is, normally, the image is stored at a low resolution (ex. 360 × 240, 30Frame / sec).

Meanwhile, when an event situation occurs in the image acquired through the camera 10, the occurrence of the event is checked and the image is stored at a high resolution (ex. 720 × 480, 30Frame / sec). Here, the camera 10 is a high resolution camera. When an event does not occur, the camera 10 converts (compresses) and stores the acquired image to a low resolution, and stores the high resolution image obtained by the camera 10 as it is in the event event. do.

Here, before storing the image acquired through the camera 10 according to whether an event occurs, first, the buffer unit 20 buffers each unit frame 1, which is an image for a predetermined time, and then, in the unit frame 1 It checks whether an event has occurred and determines the resolution accordingly and saves it.

5 is a detailed diagram illustrating an image acquisition and storage process when an event occurs according to the present invention.

As shown, the unit frame 1 divides an image obtained by the camera 10 by a predetermined time. For example, when the unit frame 1 is divided into unit frames every 30 seconds, the first unit frame obtained is the buffer unit ( 20 is buffered, and the controller 30 checks whether an event occurs in the image of the first unit frame.

After one unit frame 1 has been acquired for 30 seconds, if an event has not been generated by checking whether an event has occurred, the unit frame 1 is made to have a low resolution (ex. 360 ×) through the low resolution compression unit 42 of the encoder 40. 240, 30Frame / sec) is compressed and transmitted to the storage 51 and stored. In this case, the video compression method is compressed using the MPEG-4 compression format method.

In this way, the image acquired through the camera 10 is buffered in the buffer unit 20 for each unit frame 1, and is determined and stored in a low resolution or a high resolution according to whether an event occurs.

When an event occurs in the unit frame 1, an image is compressed at a high resolution from a predetermined time before the occurrence time (the secured section before the event occurrence point) to a predetermined time after the event end (the secured section after the event end point). At this time, the image acquired from the time point of occurrence of the event to the end point is not divided into unit frames, and the region of the event occurrence region is compressed in high resolution through the high resolution compression unit 41 of the encoder 40 without storage as a continuous frame. 51) and save. Here, the front and rear secured section time may be set according to the manager's choice.

If an event occurs at a certain point in the process of acquiring one unit frame, the remaining video portion, which is buffered before the time except for a predetermined time from the event occurrence, is immediately compressed to a low resolution through the low resolution compression unit 42. It is stored in the storage 51.

In this way, by securing the secured section before and after the event occurrence in high resolution, it secures the situation immediately before the event occurrence and the situation after the end of the event in high resolution which can become a crucial part of the site situation. Repayment judgment can be performed easily.

When the event is finished, after a predetermined time after the end of the event, the image is obtained by dividing the data into unit frames again (S), and while the event is generated, the image is continuously acquired and the above-described process is performed according to the event occurrence. .

In addition, even in a unit frame in which no event occurs, one frame is stored at a high resolution at a predetermined interval for a predetermined time set by an administrator, so that the situation determination in case of emergency can be easily performed.

6 is a detailed diagram illustrating an image acquisition and storage process through a temporary unit frame when an event occurs according to the present invention.

Up to the unit frame (hereinafter, referred to as a temporary unit frame) immediately before the unit frame in which the image acquisition is in progress, the image acquisition is performed in the buffered state in the buffer unit 20. This is when the image is buffered for each unit frame (1), and when an event occurs at the start of a new unit frame or when the event occurs shortly after the start of a new unit frame, and before the event occurs, the security interval is insufficient. At least one temporary unit frame is buffered in the buffer unit 20 to secure an image of the secured section.

As shown in the figure, an event is generated when a new unit frame is started, so that a reserved section before the event occurrence point can be obtained from the buffered temporary unit frame to secure the reserved section before the event occurrence point.

According to an embodiment of the present invention, an example of an image acquisition process will be described below, which is assumed to be 1 minute per unit frame, 10 seconds before the event occurs, and 10 seconds after the event ends.

When one minute has elapsed after image acquisition is started through the first camera 10, an image acquired for one minute from the first acquisition time is one unit frame 1 that is initially acquired.

The unit frame 1 is buffered in the buffer unit 20, and the control unit 30 checks whether an event has occurred in the unit frame 1. If the event does not occur, the unit frame 1 is buffered in the buffer unit 20 to secure a temporary unit frame, and the second unit frame 1 is obtained by obtaining an image of 1 minute 1 second to 2 minutes again. Buffer In this process, a continuous unit frame is acquired in units of 1 minute, and the unit frame excluding the ongoing unit frame and the temporary unit frame are immediately compressed at a low resolution by the low resolution compression unit 42 of the encoder 40 and stored in the storage 51. Is stored as.

If an event occurs at 5 minutes and 30 seconds in the unit frame that is being acquired, the image is secured in high resolution from 5 minutes and 20 seconds before the event occurs, and the image before 5 minutes and 20 seconds is immediately converted to a low resolution. Here, the image before 5 minutes and 20 seconds is a temporary unit frame from 4 minutes 1 second to 5 minutes and a unit frame acquired from 5 minutes 1 second to 5 minutes 19 seconds.

If the event is progressed for 1 minute, the video is obtained in high resolution according to the event occurrence from 5 minutes 30 seconds to 6 minutes 30 seconds, and includes 5 minutes 20 seconds before the event occurs and 6 minutes 40 seconds at the end of the event. Thus, the final high resolution image of the event that occurred from 5 minutes 30 seconds to 6 minutes 30 seconds would be from 5 minutes 20 seconds to 6 minutes 40 minutes.

And from 6 minutes and 41 seconds, the above process is performed according to whether an event occurs while reacquiring new unit frames at 1 minute intervals.

In addition, in the unit frame up to 5 minutes 20 seconds when the event has not occurred, a high resolution image is obtained by one frame per predetermined interval. For example, if a high resolution image is obtained by one frame every 20 seconds, 20 seconds, 40 seconds, 1 minute, 1 minute 20 seconds, 1 minute 40 ........ A high resolution image is obtained at a 5 minute 10 second frame.

7 is a flowchart illustrating a storage method for securing an optimal image according to an event occurrence according to the present invention.

First, an image acquisition step (S10) of acquiring an image through a camera 10 installed at various places.

The obtained image is buffered (temporarily stored) in the buffer unit 20, and at this time, the image is buffered for each unit frame 1 divided by a predetermined time (S20). In operation S30, it is determined whether an event occurs in the unit frame 1 stored in the buffer unit 20.

If the event does not occur in the event check step (S30) is obtained at a high resolution through the high-resolution compression unit 41 at a predetermined interval for a predetermined time set by the administrator at a high resolution (S41), the other parts of the low resolution compression It is compressed in a low resolution through the unit 42 and stored in the storage 51 (S40).

If an event is generated in the unit frame buffered in the buffer unit 20, the high-resolution compression unit 41 compresses and stores the high-resolution from a predetermined time before the event occurrence time to a predetermined time after the event termination time (S50). The previous remaining image except for a predetermined time is immediately compressed and stored at low resolution (S51).

As described above, the image data stored in the storage 51 at low resolution and high resolution is monitored through the image providing unit 50 constituting a network such as Ethernet.

8 is a schematic diagram of a DVR system for securing an optimal image according to an event occurrence according to the present invention.

As shown, a DVR (Digital Video Recorder) system according to the present invention is a buffer for buffering the camera 10, which is a photographing means, and the image acquired by the camera 10 for each unit frame 1 for a predetermined time. The unit 20, the control unit 30 for confirming whether or not the event occurs in the image of the unit frame temporarily stored in the buffer unit 20, the encoder 40 that changes in high resolution and low resolution according to the event occurrence and It includes an image providing unit 60 for storing the image determined by the encoder 40 and forming a network to manage, transmit and monitor the image obtained by the camera 10.

The image acquired through the camera 10 is stored by the DVR system, monitored in real time by the administrator, and if necessary, the stored image may be output by the administrator operation such as date, time, event occurrence, etc. .

First, an image acquired by the camera 10 is buffered in the buffer unit 20. In this case, the image obtained by the camera 10 is divided into unit frames and buffered in the buffer unit 20, and the controller 30 checks whether an event occurs in the unit frame 1. The controller 30 may check whether an event has occurred in the process of acquiring a unit frame or may check whether an event has occurred in a unit frame that is already acquired and is buffered.

When no event occurs in the unit frame 1, the controller 30 transmits the unit frame 1 in which no event occurs to the low resolution compression unit 42 of the encoder 40 to compress the low resolution. The compressed unit frame is stored in the storage 51.

When an event occurs in the unit frame 10, the controller 30 captures an image at high resolution through the high resolution compression unit 41 of the encoder 40 from a predetermined time before an event occurrence time to a predetermined time after an event end time. After compression, the data is stored in the storage 51.

The control unit 30 transmits the previous image except for a predetermined time before the event occurs to the low resolution compression unit 42 so that the previous image can be compressed and stored at low resolution and then stored in the storage 51.

The high-resolution or low-resolution video stored in real time is stored in the mass storage 51 in accordance with whether the event occurs, the storage 51 is connected to the image providing unit 50 composed of a network such as Ethernet (Ethernet).

The image providing unit 50 is a switch 52 for delivering an image stored in the storage 51 to the outside (management office, external monitor, etc.) and a display 54 for outputting the image so that an administrator or a user can monitor the image. ), A decoder 53 which decodes an image compressed into a digital signal into an analog signal to output an image to the display, and a plurality of image data stored in the storage 51 connected to the switch 52. It is composed of a control unit 55 for controlling the output to the display 54 as necessary, such as by date, time, event.

The image providing unit 50 is built in a network, the control unit 55 may monitor a plurality of images obtained from a plurality of cameras 10 at the same time. In addition, the display unit 54 may monitor a plurality of images at the same time.

The present invention constructed and operated as described above buffers the acquired image for each unit frame and then checks whether an event occurs in the unit frame and stores it at a low resolution when it does not occur, and when an event occurs, the event occurrence point is determined from a predetermined time before the event occurs. There is an advantage that can easily perform the situation judgment by storing in high resolution until after time.

While the invention has been described and illustrated in connection with a preferred embodiment for illustrating the principles of the invention, the invention is not limited to the construction and operation as shown and described.

Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

The present invention configured and operated as described above has the advantage that it is possible to easily grasp the on-site situation by acquiring not only an event occurrence section but also an image of a predetermined time before an event occurrence point after a predetermined time point when an event occurs in high resolution. There is this.

In addition, by dividing the obtained image by unit frames and compressing and storing the event-free unit frames at low resolution, it is possible to effectively use the storage space and thereby reduce the maintenance cost.

Therefore, there is an advantage that can improve the high efficiency of the DVR system by using the storage space at the same time to secure the optimal image.

Claims (10)

In the storage method for securing the optimal image according to the occurrence of the event for storing the image obtained from the DVR system, Obtaining an image photographed by a camera; Buffering the image acquired in the image acquisition step by unit frame for a predetermined time; Checking whether an event occurs in the buffered image; Converting an image to a low resolution for each buffered unit frame when the event occurrence is not confirmed in the event occurrence checking step and storing the event; And And storing an event before the event occurs from a predetermined time before the event end time after a predetermined time when the event is confirmed in the event occurrence check step. The method of claim 1, wherein the camera, Storage method for securing an optimal image according to the event occurs, characterized in that the high resolution camera. The method of claim 1, If the event is confirmed that the image before the rest except for a predetermined time before the event occurs, the step of immediately converting to a low resolution and the storage method for ensuring an optimal image according to the event occurrence, characterized in that it comprises the step of storing. The method of claim 1, wherein the buffering step comprises: And at least one temporary unit frame before the unit frame acquired through the camera is buffered together. The method of claim 1, When the event occurs, the image of the high resolution acquisition period is not divided into unit frames, characterized in that the storage method for ensuring the optimal image according to the event occurs. The method of claim 1, If the event does not occur, the storage method for ensuring the optimal image according to the event occurrence further comprising the step of storing at a high resolution one frame per predetermined interval. In the DVR system for securing the optimal image according to the occurrence of the event for storing the image obtained from the DVR system, A camera installed at various sites to acquire an image; A buffer unit which buffers the image acquired by the camera for each unit frame for a predetermined time; A control unit which checks whether an event occurs in the image buffered in the buffer unit; An encoder which changes to a low resolution when an event does not occur according to whether an event occurs in the controller, and converts an image in high resolution from a predetermined time before an event occurrence time to a predetermined time after an event end time when an event occurs; And DVR for securing the optimal image according to the event occurrence, comprising; a video providing unit for storing the high-resolution and low-resolution converted video in accordance with the occurrence of the event through the encoder and consisting of a network network to output and control the necessary video system. The method of claim 7, wherein the image providing unit, A storage for storing a video converted to a low resolution or a high resolution according to whether an event occurs; A switch connected to the storage and a network network and connected to a plurality of display units which output images stored in the storage; A decoder for converting an analog signal to output an image converted into a digital signal by the encoder to the display unit; And A control unit connected to the switch and controlling to output an image stored in the storage according to a time zone, an event, and a date, as necessary; and a DVR for securing an optimal image according to an event occurrence. system. The method of claim 7, wherein the camera, DVR system for optimal image study according to the event generation, characterized in that the high-resolution camera. The method of claim 7, wherein the encoder, A low resolution compression unit for compressing the low resolution when no event occurs; And When the event occurs, a high-resolution compression unit for compressing at high resolution; DVR system for ensuring the optimal image according to the event occurs.

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