KR100737740B1 - Digital video surveillance system using ieee 1394 interface and method for providing bandwidth using thereof - Google Patents

Abstract

The present invention generates image data converted by using an image compression standard by capturing an image in a surveillance range of a certain range, and selects a portion of the image data that needs to be transmitted to select the image data (hereinafter referred to as "FOI") from IEEE. A plurality of cameras transmitting using a 1394 interface, and digitally assigning priority to each of the plurality of cameras and receiving and storing the FOI according to the priority using the IEEE 1394 interface from the plurality of cameras. A video surveillance system using an IEEE 1394 interface including a storage device.

According to the present invention, when configuring a digital video surveillance system by connecting a plurality of surveillance cameras using the IEEE 1394 interface, a small capacity storage medium is embedded in the surveillance camera node itself, and priority-based bus control is performed. By connecting multiple surveillance cameras to the network at the same time without losing data, the cost of building a video surveillance system can be reduced, and collected video data can be stored efficiently. In addition, it is possible to effectively perform operations such as searching and browsing the stored image data. In addition, it improves the disadvantage that the load is concentrated on the digital storage device in the conventional video surveillance system, so that each camera generates FOI image to be encoded and transmitted, and the digital storage device simply receives and stores the FOI from each camera according to the priority. The load on the digital storage device can be reduced.

IEEE 1394, Video Surveillance System, Bandwidth Reservation, Priority, Message, Network

Description

Video surveillance system using IIEE 1394 interface and method for securing bandwidth using the device {DIGITAL VIDEO SURVEILLANCE SYSTEM USING IEEE 1394 INTERFACE AND METHOD FOR PROVIDING BANDWIDTH USING THEREOF}

1 is a block diagram of a digital video surveillance system according to the prior art

2 is a block diagram of a video surveillance system using the IEEE 1394 interface according to the present invention.

3 is a block diagram of a camera in a video surveillance system using an IEEE 1394 interface according to the present invention;

4 is a flowchart of a bandwidth securing method in a video surveillance system using an IEEE 1394 interface according to the present invention;

<Description of the symbols for the main parts of the drawings>

40: monitor 100: camera

110: CCD 120: A / D converter

130: DSP 140: D / A Converter

200: coaxial cable 300: digital storage device

310: A / D converter 320: memory

330: microprocessor 340: data compressor

350: storage medium 360: external terminal

400: camera 410: CCD

420: Image encoder 430: FOI inspection unit

440: transmission control unit 450: image storage unit

460: 1394 interface unit 500: digital storage device

510: 1394 interface unit 520: central processing unit

530: the image storage unit

The present invention relates to a video surveillance system using an IEEE 1394 interface and a bandwidth securing method using the same. More specifically, the surveillance camera node itself when the digital video surveillance system is configured by connecting a plurality of surveillance cameras using the IEEE 1394 interface. The built-in small capacity storage medium and priority-based bus control can reduce the cost of video surveillance system by simultaneously connecting multiple surveillance cameras to the network without data loss. It is possible to effectively perform the operations such as searching and browsing the stored image data, and improves the disadvantage that the load is concentrated on the digital storage device in the conventional video surveillance system.In the storage device to merely the FOI First, configured to store to receive the rank according to the bandwidth securing method using a video surveillance system, and this, using the IEEE 1394 interface that can reduce the load on the digital storage device from each camera.

Conventional video surveillance system mainly consists of CCTV and VTR storage media connected to it. Since video tapes are used as storage media, tapes must be purchased and replaced periodically. Has the disadvantages such as deterioration of picture quality due to wear and the cost of system management. In addition, there is no method for efficiently searching for a desired video, and expensive equipment has to be installed in order to add additional functions such as network transmission or adding a surveillance camera.

A digital video recording system (Digital Video Recording System or Digital Video Surveillance System) is an image that stores images coming from a video input device such as a CCTV camera in a digital storage medium such as a hard disk, rather than an analog storage medium such as a conventional video tape. Surveillance system.

The digital video surveillance system converts a plurality of analog video into digital video using digital video compression technology of a computer, and can store high-quality video for a long time on a hard disk or other storage device, which is a digital storage medium. Low resolution recording, degradation of playback quality due to degradation of video tape, problems with tape management / functionality, interworking with peripheral devices, addition of equipment for long-distance transmission, etc. (PSTN) or local network (LAN), such as a network can be used at the same time, has the advantage of being able to control the camera from a remote location using the network.

Such a digital video surveillance system, for example, was filed on October 18, 2002 by Etronics Co., Ltd. and registered on November 4, 2003, and registered under a patent registration number entitled "Security System for Serial Transmission of Digital Video Signals." 10-0405911.

1 is a configuration diagram of a digital video surveillance system shown as a prior art in the patent registration number 10-0405911.

As shown in the drawing, a conventional digital video surveillance system includes a camera 100, a coaxial cable 200 for transmitting an image signal photographed by the camera 100 in an analog manner, and a digital signal for storing the transmitted analog signal as digital data. Storage device 300.

In addition, the digital video surveillance system may further include a monitor 40 for monitoring the video signal photographed by the monitor. One or more cameras 100 may be installed in an area where video surveillance is desired, and video signals simultaneously captured by a plurality of cameras 100 are simultaneously stored in the digital storage device 300.

The camera 100 includes a CCD (charge coupled device) 110 for outputting an image of a predetermined time as a video signal through a lens, and converts the video signal into a raw digital video signal. Analog to Digital converter (120) and the raw digital video signal to the video format of the International Radio Consultative Committee (CCIR) or Society of Motion Picture and Television Engineers (SMPTE) recommendations, that is, the usable digital video signal. Digital Signal Processor (DSP) for encoding a usable digital video signal, and D / A converter for converting a usable digital video signal through the DSP 130 into a composite video signal (Digital to Analog converter, 140).

The composite video signal, which is the analog video signal, is transmitted through the coaxial cable 200. The coaxial cable 200 generally has a characteristic resistance of 75 ohms and a bandwidth of about 500 Mbps in order for a composite video signal to be smoothly transmitted. ) Has characteristics.

The digital storage device 300 includes an A / D converter 310 for converting a composite video signal transmitted through the coaxial cable 200 into a digital signal, and converting the converted digital video signal into an MPEG (Moving Picture Experts Group). Data compressor 340, which is compressed by a Joint Photographic Experts Group (JPEG) method, a storage medium 350 such as a hard disk on which the compressed data is stored, the A / D converter 310 and the data compressor ( The microprocessor 330 controls the 340 by a pre-stored control program and a memory 320 in which the control program is stored. In addition, the digital storage device 300 is provided with an external terminal 360 to output an image signal to the monitor 40.

The digital video surveillance system according to the prior art requires a lot of storage capacity by converting and storing all video data into a video compression standard such as MPEG-4, and it is inconvenient and time-consuming to search past data. . In addition, when a plurality of cameras are connected to the digital video surveillance system, the amount of data to be stored increases in proportion to the number of cameras.

In addition, a digital video surveillance system has been developed that uses a relatively simple network configuration even when a plurality of cameras are connected using an IEEE 1394 interface instead of a coaxial cable.

Even when the multiple video surveillance cameras are connected using the IEEE 1394 interface, as the number of cameras connected to the digital video surveillance system increases, the bandwidth required for the perfect transmission of the image data collected from each camera to the digital storage device is obtained. There is a disadvantage that cannot be secured enough.

For example, in the case of the IEEE-1394 interface, the currently commercialized standard can secure a bandwidth of 200 to 400 Mbps. Even when each image data is compressed by an MPEG-2 type encoding system, two or three cameras are actually used. Only the connection is possible, and even with MPEG-4, do not connect several dozen cameras at the same time.

Accordingly, there is a growing need for a method of efficiently collecting and storing image data even when multiple cameras are connected at the same time in a digital surveillance image system that transmits image signals using the IEEE 1394 interface.

 An object of the present invention is to use a small capacity storage medium embedded in the surveillance camera node itself when connecting a plurality of surveillance cameras using the IEEE 1394 interface and loss of data through priority-based bus control It is possible to reduce the cost of building a video surveillance system by simultaneously connecting multiple surveillance cameras to a network without storing the collected video data efficiently, and to search and browse the stored video data effectively. In the conventional video surveillance system, the load has been concentrated on the digital storage device to improve the disadvantage that each camera generates FOI images to be encoded and transmitted, and the digital storage device is simply configured to receive and store the FOI from each camera according to priority. Storage A video surveillance system using the IEEE 1394 interface can reduce the load and to provide a secure method using the same bandwidth.

In order to achieve the above technical problem, the present invention generates the image data converted by using an image compression standard by taking an image in a surveillance region of a certain range, and selects the portion of the image data that needs to be transmitted from the image data (hereinafter referred to as A plurality of cameras transmitting " FOI " using the IEEE 1394 interface, and dynamically prioritizing each of the plurality of cameras and using the IEEE 1394 interface from the plurality of cameras in accordance with the priority. It provides a video surveillance system using an IEEE 1394 interface including a digital storage device for receiving and storing the FOI.

In the video surveillance system using the IEEE 1394 interface according to the present invention, each of the plurality of cameras has a CCD for outputting an image of a certain instant as a video signal through a lens, and a video compression standard for the video signal input through the CCD. An image encoder for converting the image data into an image data, an FOI inspector for analyzing whether the FOI is included by analyzing the image data encoded by the image encoder, and transmitting the FOI inspected by the FOI inspector. A transmission control unit which generates a request message and transmits it to the digital storage device and transmits the FOI to the digital storage device when receiving a transmission acceptance message from the digital storage device and stores the FOI when receiving a transmission waiting message. And storing the FOI under control of the transmission control unit. The image storage unit and a 1394 interface for performing data transmission and reception with the digital storage device.

In the video surveillance system using the IEEE 1394 interface according to the present invention, it is preferable that the video encoder encodes an image using the MPEG-2 or MPEG-4 standard.

In the video surveillance system using the IEEE 1394 interface according to the present invention, it is preferable that the FOI inspection unit checks whether the bit rate is high or the compression rate is high during the video encoding process by the video encoder. Do.

In the video surveillance system using the IEEE 1394 interface according to the present invention, when the transmission control unit receives the transmission waiting message, it is preferable to transmit the transmission request message to the digital storage device again.

In addition, in the video surveillance system using the IEEE 1394 interface according to the present invention, when all the FOI is transmitted, the transmission control unit preferably generates a transmission completion message and transmits the message to the digital storage device.

In addition, in the video surveillance system using the IEEE 1394 interface according to the present invention, the digital storage device, when receiving the transmission completion message to generate a reception completion message in response to the IEEE 1394 interface Video surveillance system.

In addition, in the video surveillance system using the IEEE 1394 interface according to the present invention, the transmission control unit, if the amount of the FOI stored in the video storage unit is close to the maximum capacity that can be stored in the video storage unit for priority transmission A priority transmission request message is generated and transmitted to the digital storage device. When the priority transmission request message is received, the digital storage device preferably receives and stores the FOI corresponding to the transmission request message regardless of priority. Do.

In addition, in the video surveillance system using the IEEE 1394 interface according to the present invention, it is preferable that each camera has a fixed camera angle so as to photograph a specific point.

In addition, in the video surveillance system using the IEEE 1394 interface according to the present invention, the digital storage device, 1394 interface unit for performing data transmission and reception of the plurality of cameras, and transmitting the stored image data from each of the plurality of cameras A central processing unit for receiving the FOI by receiving a request message and dynamically setting a priority for each camera and sending a transmission acceptance message or a transmission waiting message to each of the plurality of cameras according to the set priority; Preferably, the image data storage unit stores the FOI received by the device.

In addition, the present invention generates a video data converted by using a video compression standard by taking a picture of a certain area of the surveillance region, and selects the portion of the video data that needs to be transmitted to the selected video data (hereinafter referred to as "FOI") A plurality of cameras transmitting using an IEEE 1394 interface and dynamically prioritizing each of the plurality of cameras, and receiving and storing the FOI according to the priority using the IEEE 1394 interface from the plurality of cameras. A bandwidth securing method in a video surveillance system using an IEEE 1394 interface including a digital storage device, the method comprising: encoding image data input from each of the cameras and determining whether an event for requesting transmission of a FOI occurs during the encoding; And generating the event And generating a transmission request message for transmitting the FOI from the camera to the digital storage device, receiving the transmission request message from the digital storage device, inspecting bus traffic, and freeing up bus traffic. If the transmission permits: generating a transmission acceptance message in the digital storage device and transmitting it to the camera, transmitting the FOI from the camera to the digital storage device, and transmitting the FOI to the digital storage device. Receiving and storing the data, transmitting the transmission completion message from the camera to the digital storage device when the transmission of the FOI is completed, and receiving the transmission completion message from the digital storage device accordingly. Generating a completion message and sending it to the camera. In case the bus traffic is insufficient or the bandwidth is insufficient: generating a transmission waiting message in the digital storage device and transmitting the message to the camera; increasing the priority of the camera in the digital storage device; Receiving the transmission waiting message at the camera and storing the FOI in an image storage unit in the camera; and transmitting the transmission request message back to the digital storage device at the camera. Provides bandwidth securing method in video surveillance system.

In the method for securing bandwidth in a video surveillance system using the IEEE 1394 interface according to the present invention, the step of encoding the video data input from each of the cameras, encoding the video using the MPEG-2 or MPEG-4 standard. desirable.

In the bandwidth securing method of the video surveillance system using the IEEE 1394 interface according to the present invention, the step of determining whether an event for requesting the transmission of the FOI occurs during the encoding, the bit rate is high or the compression rate during the encoding process It is preferable to include the step of checking whether the increase.

Hereinafter, a video surveillance system using the IEEE 1394 interface of the present invention and a bandwidth securing method using the same will be described in more detail with reference to the accompanying drawings.

2 is a block diagram of a video surveillance system using an IEEE 1394 interface according to the present invention.

As shown, the video surveillance system according to the present invention includes a plurality of cameras 400A to 400M and a digital storage device 500.

Each of the cameras 400A to 400M captures an image in a surveillance range of a certain range, converts it using an image compression standard such as MPEG-2 or MPEG-4, and then transmits a portion that requires transmission, that is, a frame-of-FOI. -interest) only to be transmitted to the digital storage device 500.

In the video surveillance system according to the present invention, each of the cameras 400A to 400M encodes an image using a standard such as MPEG, and selects and transmits only the FOI from the encoded image data so as to efficiently use network resources. In terms of configuration, there is a difference from a camera in a conventional video surveillance system.

Each of the cameras 400A to 400M in the video surveillance system according to the present invention will be described with reference to FIG. 3.

3 is a block diagram of a camera in a video surveillance system using an IEEE 1394 interface according to the present invention.

As shown, the camera 400 includes a CCD 410, an image encoder 420, a FOI inspection unit 430, a transmission control unit 440, an image storage unit 450, and a 1394 interface unit 460. Each). The configuration of each camera 400A to 400M shown in FIG. 2 is substantially the same as that of the camera 400.

The CCD 410 outputs an image of a certain moment as an image signal through a lens.

The image encoder 420 converts the image signal input through the CCD into image data using an image compression standard such as MPEG-2 or MPEG-4.

The FOI checker 430 analyzes the image data encoded by the image encoder 420 to check whether the FOI is included.

In more detail with respect to the FOI inspection unit 430, the data that requires actual storage in the video surveillance system is the portion in which a change in motion or motion occurs, that is, the FOI compared to the reference video, and thus the FOI among the encoded video data. It checks whether the FOI is included by checking whether there is a frame corresponding to.

For example, when the angle of the camera is fixed to photograph a specific point, in most situations, a still image, that is, a background screen, which is unchanged, is input through the CCD 410 and encoded by the image encoder 420. In this case, the amount of data required for generating the image data will be very small.

However, when the part where the motion or motion occurs is generated, a lot of data is required for encoding and the compression rate is also high.

Therefore, when the FOI inspection unit 430 monitors the encoding process of the image encoder 420 and the bit rate increases or the compression rate increases, one sub-frame is used as a representative frame. A sub-frame is set and determined as a FOI.

The transmission control unit 440 communicates with the central processing unit 520 of the digital storage device 500 to control the transmission in order to transmit the FOI checked by the FOI inspection unit 430 to the digital storage device 500.

That is, the FOI checker 430 examines a case in which a subframe corresponding to the FOI occurs and recognizes it as a single event, and generates a transmission request message for transmitting the FOI whenever the event occurs. 500). Thereafter, the digital storage device 500 transmits a transmission acceptance message or a transmission waiting message according to the traffic inspection result, and if the transmission control unit 440 receives a transmission acceptance message that permits transmission, the digital storage device 500 transmits the FOI. In case of receiving a transmission waiting message or transmitting a transmission waiting message, the FOI is stored, and the transmission request message is transmitted back to the digital storage device 500 for transmission of the FOI.

In addition, when all the FOIs are transmitted to the digital storage device 500, the transmission completion message is generated and transmitted to the digital storage device 500 so that the digital storage device 500 can process the transmission request message from another camera. . In this case, the digital storage device 500 generates a reception completion message and transmits the reception completion message to the camera 400 in response to the transmission completion message.

The image storage unit 450 stores the FOI under the control of the FOI inspection unit 430. In other words, if a message waiting to be received is temporarily stored. In addition, when the angular size of the FOI data stored in the image storage unit 450 approaches the maximum capacity that can be stored in the image storage unit 450, an overflow may occur. Therefore, in this case, when the transmission control unit 440 generates the transmission request message first and transmits it to the digital storage device 500, it is preferable to configure the reception unit FOI.

The 1394 interface unit 460 is in charge of interfacing with the digital storage device 500 so that image data can be transmitted without error.

In addition, the digital storage device 500 dynamically prioritizes each of the plurality of cameras 400A to 400M, and receives and stores FOIs according to the priorities from each of the plurality of cameras 400A to 400M. The conventional video surveillance system improves the disadvantage that the load is concentrated on the digital storage device by simultaneously performing encoding and image storage in the digital storage device. In the present invention, the FOI image is encoded and transmitted by each camera, and the digital storage device 500 In the configuration simply configured to receive and store the FOI from each camera according to the priority, it is configured to reduce the load of the digital storage device (500).

In more detail with respect to the digital storage device 500, the digital storage device 500 includes a 1394 interface unit 510, a central processing unit 520, and an image storage unit 530.

The 1394 interface unit 510 is responsible for interfacing with the 1394 interface unit 460 embedded in the plurality of cameras 400A to 400M, respectively, so that image data may be transmitted without error.

The central processing unit 520 communicates with the transmission control unit 440 built in the plurality of cameras 400A to 400M, respectively, to prioritize the image data stored in each image storage unit 450 of the plurality of cameras 400A to 400M. Control to receive based on the ranking.

In more detail with respect to the central processing unit 520, the central processing unit 520 may send a transmission request message for requesting transmission of stored image data from each transmission control unit 440 of the plurality of cameras 400A to 400M. Receive

In this case, if the bus traffic can simultaneously accept the transmission request from each of the cameras 400A to 400M, the transmission acceptance message is transmitted to each transmission request message to receive the respective image data.

However, if the bus traffic cannot accept the transmission request of each camera 400A to 400M at the same time, priority is given to each camera 400A to 400M and the transmission acceptance message is transmitted to each camera sequentially so that the traffic of the bus Can be used efficiently.

In addition, if a priority transmission request message is continuously transmitted from one of the cameras 400A to 400M, the camera receives the FOI of the camera regardless of the priority of the camera node and stores it in the video storage of the camera. Overflow is prevented because the amount of data exceeds the available capacity.

The image storage unit 530 stores the image data received through the central processing unit 520.

 4 is a flowchart illustrating a bandwidth securing method of a video surveillance system using an IEEE 1394 interface according to the present invention.

In a method for securing bandwidth in a video surveillance system using an IEEE 1394 interface according to the present invention, a plurality of camera nodes are connected to a video surveillance system, and digital storage in the video surveillance system is performed only when an event for video transmission occurs at each camera node. Send image data to the device.

First, each camera encodes an input video signal (S110). The video signal is encoded using, for example, a video compression standard such as MPEG-2 or MPEG-4.

In each camera, it is determined whether a change in the image data occurs during the encoding process, so that an event for requesting transmission of the image data (hereinafter referred to as "FOI") of the corresponding portion occurs (S120).

Whether or not an event for FOI transmission occurs is determined by examining a portion of a high bit rate or a high compression rate in an image encoding process. The image data of the portion of which the bit rate is high or the compression rate is high, that is, the FOI, is image data that requires actual storage among the encoded images.

By transmitting only these FOIs to the digital storage device, the digital storage device can be used efficiently and network resources can be efficiently used even when multiple cameras are connected. This FOI is composed of subframes whose frame is a representative frame.

When an event for FOI transmission occurs, each camera generates a transmission request message to transmit the FOI and transmits it to the digital storage device (S130).

Thereafter, when the digital storage device receives the transmission request message from each camera, the central processing unit included in the digital storage device inspects the bus traffic (S140).

If the central processing unit monitors the bus traffic and cannot accommodate the video data transmission due to insufficient bus traffic, or if the bandwidth is insufficient, the central processing unit generates a transmission waiting message and transmits it to the camera (S142), and the FOI of the corresponding camera. The transmission priority is increased by 1 (S144).

After receiving the transmission wait message, the camera stores the FOI in the internal image storage unit (S146), and transmits the transmission request message back to the digital storage device (S150). After the transmission acceptance message is received, the transmission is started.

In addition, when receiving the transmission request message from the digital storage device, if it is determined that the transmission request of the camera node can be accepted, a transmission acceptance message is generated and transmitted to the camera (S160).

When the camera receives the transmission acceptance message, the FOI is transmitted to the digital storage device (S170).

Thereafter, the digital storage device stores the received FOI (S180). When all the FOIs are transmitted, the camera generates a transmission completion message and transmits it to the digital storage device (S190). Thereafter, the digital storage device transmits the reception completion message in response to the transmission completion message (S195), thereby ending the FOI reception process.

Through this step, image data transmission from the camera is completed, and the digital storage device processes the transmission request message from another camera.

Although the present invention has been described in detail, this is for illustrative purposes only, and the protection scope of the present invention is not limited thereto, and the protection scope of the present invention is defined through the description of the claims.

As described above, according to the present invention, when configuring a digital video surveillance system by connecting a plurality of surveillance cameras using the IEEE 1394 interface, a small capacity storage medium is embedded in the surveillance camera node itself and is controlled through priority-based bus control. By connecting multiple surveillance cameras to the network at the same time without losing data, the cost of building a video surveillance system can be reduced and the collected video data can be stored efficiently. In addition, it is possible to effectively perform operations such as searching and browsing the stored image data. In addition, the conventional video surveillance system improves the disadvantage that the load is concentrated on the digital storage device, so that each camera generates FOI images to be encoded and transmitted. The load on the digital storage device can be reduced.

Claims (13)

Image data in a certain range of surveillance areas are taken to generate the converted image data using the image compression standard, and the selected image data (hereinafter referred to as "FOI") is selected from the image data using the IEEE 1394 interface. Using a plurality of cameras to transmit, A digital storage device which dynamically prioritizes each of the plurality of cameras and receives and stores the FOI according to the priority from the plurality of cameras using an IEEE 1394 interface. Including, Each of the plurality of cameras, A CCD for outputting an image of a certain moment as a video signal through a lens, An image encoder for converting an image signal input through the CCD into image data using an image compression standard; An FOI inspection unit which analyzes the image data encoded by the image encoding unit and checks whether the FOI is included; In order to transmit the FOI checked by the FOI inspection unit, a transmission request message is generated and transmitted to the digital storage device, and when the transmission acceptance message is received from the digital storage device, the FOI is transmitted to the digital storage device and a transmission waiting message is received. A transmission control unit for controlling to store the FOI when receiving a; An image storage unit for storing the FOI under control of the transmission control unit; 1394 interface unit for transmitting and receiving data with the digital storage device Video surveillance system using an IEEE 1394 interface. delete The method of claim 1, wherein the image encoder, A video surveillance system using the IEEE 1394 interface for encoding video using the MPEG-2 or MPEG-4 standard. The method of claim 1, wherein the FOI inspection unit, And checking whether the bit rate is high or the compression rate is high during the video encoding process by the video encoder. The method of claim 1, wherein the transmission control unit, And transmitting the transmission request message back to the digital storage device when the transmission waiting message is received. The method of claim 1, wherein the transmission control unit, And a transmission completion message is generated and transmitted to the digital storage device when all the FOIs are transmitted. The method of claim 6, wherein the digital storage device, And receiving a transmission completion message and generating a reception completion message and transmitting the received completion message to the camera. The method of claim 1, wherein the transmission control unit, If the amount of the FOI stored in the image storage unit is close to the maximum capacity that can be stored in the image storage unit to generate a priority transmission request message for priority transmission and transmit to the digital storage device, And the digital storage device receives and stores the FOI corresponding to the transmission request message preferentially when the priority transmission request message is received, regardless of priority. The method of claim 1, wherein each of the cameras, Video surveillance system using the IEEE 1394 interface where the camera angle is fixed to capture a specific point. The method of claim 1, wherein the digital storage device, A 1394 interface unit for transmitting and receiving data of the plurality of cameras; Receiving a transmission request message of the FOI from each of the plurality of cameras to dynamically set the priority for each of the cameras and send a transmission acceptance message or a transmission waiting message to each of the plurality of cameras according to the set priority to set the FOI. Receiving central processing unit, Image data storage unit for storing the FOI received by the central processing unit Video surveillance system using an IEEE 1394 interface. Image data in a certain range of surveillance areas are taken to generate the converted image data using the image compression standard, and the selected image data (hereinafter referred to as "FOI") is selected from the image data using the IEEE 1394 interface. A plurality of cameras for transmitting and storing the plurality of cameras; A bandwidth securing method in a video surveillance system using an IEEE 1394 interface, Encoding image data input from each of the cameras; Determining whether an event for requesting transmission of the FOI occurs during the encoding; Generating a transmission request message for transmitting the FOI to the digital storage device when the event occurs; Receiving the transmission request message at the digital storage device and inspecting bus traffic; If you have sufficient bus traffic to allow transmission: Generating a transmission acceptance message in the digital storage device and transmitting it to the camera; Transmitting the FOI from the camera to the digital storage device; Receiving and storing the FOI in the digital storage device; Transmitting a transmission completion message from the camera to the digital storage device when the transmission of the FOI is completed; Generating a reception completion message and transmitting the reception completion message to the camera when the transmission completion message is received by the digital storage device; If there is no margin for bus traffic or insufficient bandwidth: Generating a transmission waiting message in the digital storage device and transmitting the message to the camera; Increasing the priority of the camera in the digital storage device; Receiving the transmission waiting message in the camera and storing the FOI in an image storage unit in the camera; Transmitting, by the camera, the transmission request message back to the digital storage device. Bandwidth securing method in a video surveillance system using an IEEE 1394 interface comprising a. The method of claim 11, wherein the encoding of the image data input from each of the cameras comprises: A method of securing bandwidth in a video surveillance system using an IEEE 1394 interface, which encodes video using MPEG-2 or MPEG-4 standards. The method of claim 11, wherein the determining of whether an event for requesting transmission of the FOI occurs during the encoding comprises: And checking whether the bit rate is high or the compression rate is high during the encoding process.

Images