KR20090030201A - Plc ip camera network system using power line communication method - Google Patents

Abstract

A PLC IP(Internet Protocol) camera network system using the PLC(Power Line Communication) control method is provided to be interwork with various CCD cameras and construct a wideband network system by giving the IP function. A zero potential detector(211) detects the zero potential point in which noise is most less in an AC sinusoidal waveform to stably perform the power line communication. A transient current protecting and coupling device(212) directly comes in contact with a power line to perform the power line communication, puts data in the power line, and then performs the data conversion and data transmission. An Ethernet device(216) converts a video signal transmitted to the Ethernet. Data transmitted as image is compressed and coded by an encoder(221). A processor(222) manages IP addresses and controls the serial communication. An audio codec(223) compresses and codes an audio signal.

Description

PLC IP Camera Network System Using Power Line Communication Method

The present invention relates to a PLC camera interface device of the power line communication method, in particular, can be interlocked with a variety of products of the CCD camera, it is possible to build a system of a broadband network by providing an IP function, PLC (Power Line Communication) system The present invention relates to a PLC camera interface device of a power line communication method having an extended convenience function.

Currently, closed circuit television (CCTV) is coming closer to our lives. It is applied to various areas such as crime prevention, disaster prevention, transportation, etc., and forms a market of about 150 billion units every year. The function of unattended and remote video surveillance of CCTV system has been developed for decades and applied to various markets due to excellent video transmission and various product supply. However, the biggest disadvantage is that it is difficult to build a system in a broadband area. This is because the data transmission distance of the coaxial cable can be transmitted at a distance of up to 500m to 1km. In addition, it was difficult to expand the system easily because the coaxial cable, power supply line, and control cable had to be newly installed from the main equipment (DVR server) to the installed camera when additional cameras were installed.

In order to overcome the limitations of the CCTV system, the newly introduced system is the IP network camera market. The IP network camera system is designed based on the Internet IP and has a significant advantage in building a broadband system because the system can be realized by simply connecting to the Internet wherever it can be connected to the Internet. However, this IP network Carrera system has proved to be superior in the construction of a broadband system, but has poor image quality compared to conventional CCD cameras, a price range of 5 to 10 times, a monotonous product type (mostly for indoor use), and new cameras as well as CCTV systems. The system is only available in some markets because of the need for new installations of data cables (UTPs) and power supply lines.

1 is a block diagram of a CCTV system according to the prior art.

In the conventional CCTV system, as shown in FIG. 1, a CCD camera 11 photographing an image signal and an image signal photographed from the CCD camera 11 are transmitted through a coaxial cable 12 to receive a power line 13. Distributor 15 for distributing and supplying commercial power through the cable, and is connected between the distributor 15 and the DVR server 17 to transmit an image signal through the coaxial cable 12 and to supply commercial power through the power line 13. It comprises a repeater 16 for supplying the.

In the CCTV system having the above configuration, a large amount of coaxial cable 12 and a power line 13 must be separately installed to transmit a video signal between a camera and a DVR server 17 installed at a remote location. Therefore, it was difficult to expand the system easily because the coaxial cable 12 and the power supply line 13 and the control cable, which are newly installed from the DVR server 17 to the installation camera, should be newly installed. And, there is a problem in that the cost of installing the cable, and hassle in installing and maintaining the installed cable and costly cable installation.

In addition, the coaxial cable 12 has a disadvantage in that it is difficult to construct a system in a broadband region because data transmission is possible only in a short distance of a maximum data transmission distance of about 500m to 1km.

2 is a block diagram of an IP camera system according to the prior art.

As shown in FIG. 2, the conventional IP camera system receives an IP camera 21 for capturing an image signal and a video signal photographed from the IP camera 21 through a data cable (UTP) 22. Ethernet switch 25 for distributing and supplying commercial power through the power line 13, and is connected between the Ethernet switch 25 and the DVR server 27 to transmit a video signal through a data cable (UTP) 22 And a switching hub 26 for supplying commercial power through the power line 13.

In the IP camera system having the above configuration, since the video signal is transmitted using the data cable (UTP) 22 instead of the coaxial cable 12 used in the conventional CCD camera system, it is easy to construct a system in a broadband area. In addition, the image quality performance is lowered compared to the conventional CCD camera, and the price is expensive, and most of them are manufactured for indoor use, so there are not many kinds of products. In addition, like the CCTV camera system, when a new camera is extended, a data cable (UTP) 22 and a power supply line 23, which is a power supply line, need to be newly installed.

On the other hand, the conventional system using the power line communication method is to give the IP function by embedding the power line modem in a specific camera, this type of product performance (fixed, zoom, zoom + tilting) of the specific camera selected by the company that produced the CCD camera ) Was difficult to meet the various needs of users.

Therefore, there is an urgent need for a system having both the various types of CCD cameras and the advantages of the broadband network of an IP camera and the convenience of system expansion of PLC (power line communication).

The present invention has been made to solve the conventional problems, the first object of the present invention is to be able to interlock with a variety of products of the CCD camera, it is possible to build a broadband network system by providing an IP function and PLC (Power Line Communication: The present invention provides a PLC camera interface device of a power line communication system equipped with all the conveniences of system expansion of power line communication).

A second object of the present invention is to provide a power line communication type PLC camera interface device having a PLC interface device for compressing and coding image data, allocating an IP address, and converting and transmitting the image data.

A third object of the present invention includes a plurality of systems including a CCD camera, a PLC interface device, and a PLC interface local server, and connects power line communication (PLC) between the plurality of PLC interface local servers and a PLC router. It is to provide a PLC camera interface device of a power line communication method in which a local network is formed by connecting an internet network between a router and a main server of a security office.

A fourth object of the present invention includes a plurality of systems including a CCD camera, a PLC interface device, and a PLC interface local server, and connects a backbone network between the plurality of PLC interface local servers and a main server of an integrated information center to establish a broadband network. It is to provide a PLC camera interface device of the configured power line communication method.

PLC camera interface device of the power line communication method according to the present invention for achieving the above object is a CCD camera; A PLC interface device for receiving image data from the CCD camera through a cable, compressing and coding the image data, allocating an IP address, converting the image data into a PLC, and supplying power through a power line; A PLC modem for communicating with and supplying power through the power line with the PLC interface device; And a DVR server communicating with the PLC modem via a data cable (UTP).

In addition, a PLC camera interface device of a power line communication method according to the present invention for achieving the above object is a CCD camera; A PLC interface device for receiving image data from the CCD camera through a cable, compressing and coding the image data, allocating an IP address, converting the image data into a PLC, and supplying power through a power line; And a PLC modem configured to communicate with and supply power to the PLC interface device through a power line. And a DVR server communicating with the PLC router via an internet network.

In addition, a CCD camera of the PLC camera interface device of the power line communication method according to the present invention for achieving the above object; And a plurality of PLC interface local servers having a PLC interface device for receiving and compressing image data from the CCD camera, assigning an IP address, and converting and transmitting the image data. A PLC router communicating over a power line; The PLC interface device of the power line communication type PLC camera interface device including the DVR server to communicate with the PLC router via the Internet network, zero noise (Zero; 0 ') a zero potential detector for detecting a potential point; A transient protection and coupling device unit for performing data conversion and data transmission for performing a function of directly carrying out the data by directly contacting the power line to carry out the power line communication, and sending and extracting the data; A nonvolatile memory in charge of data processing and operation through the power line communication; An Ethernet device unit for converting an image signal transmitted through Ethernet; A PLC module connected to the zero potential detector, the transient protection and coupling device unit, a nonvolatile memory, and the Ethernet device unit to control the power line communication; And a power supply unit receiving power through the power line and supplying power required to the inside of the PLC interface device. An encoder unit connected to the Ethernet device unit and compression-coding data transmitted as an image; A processor for managing an IP address and controlling serial communication and audio input; An image sensor unit converting analog input image data input from the CCD camera into digital image data and transmitting the same to the processor; And an audio codec configured between the processor and the AD / DA converter. And an IP camera region unit having a UART (Universal Asynchronous Receiver Transmitter) connected between the process unit, the RS485 terminal, and the RS232 terminal.

In addition, a CCD camera of the PLC camera interface device of the power line communication method according to the present invention devised to achieve the above object; A plurality of PLC interface local servers having a PLC interface device for receiving and compressing image data from the CCD camera, assigning an IP address, and converting and transmitting the image data are provided between the plurality of PLC interface local servers. The PLC interface device of the power line communication type PLC camera interface device comprising: a main server of an integrated information center connected to the main network and communicating with the plurality of PLC interface local servers through the main network. A zero potential detector for detecting a zero potential point having the least noise in the alternating sine wave waveform; A transient protection and coupling device unit for performing data conversion and data transmission for performing a function of directly carrying out the data by directly contacting the power line to carry out the power line communication, and sending and extracting the data; A nonvolatile memory in charge of data processing and operation through the power line communication; An Ethernet device unit for converting an image signal transmitted through Ethernet; A PLC module connected to the zero potential detector, the transient protection and coupling device unit, a nonvolatile memory, and the Ethernet device unit to control the power line communication; And a power supply unit receiving power through the power line and supplying power required to the inside of the PLC interface device. An encoder unit connected to the Ethernet device unit and compression-coding data transmitted as an image; A processor for managing an IP address and controlling serial communication and audio input; An image sensor unit converting analog input image data input from the CCD camera into digital image data and transmitting the same to the processor; And an audio codec configured between the processor and the AD / DA converter. And an IP camera region unit having a UART (Universal Asynchronous Receiver Transmitter) connected between the process unit, the RS485 terminal, and the RS232 terminal.

The method of compressing and coding the image data may include compressing and encoding the image data using any one of Motion-Joint Photograph Expert Group (M-JPEG), Motion Photograph Expert Group (MPEG) 2, and MPEG 4 according to the environment. It features.

The method of allocating an IP address may include allocating an IP address using a Dynamic Host Configuration Protocol (DHCP) method.

The method of converting the image data to the PLC is characterized in that the image data to the PLC using a multi-carrier (Multi-Carrier) method.

The backbone network is a complex network structure in which wireless communication, power line communication (PLC), and optical communication are combined.

According to the PLC camera interface device of the power line communication method according to the present invention has the following advantages.

1) The system construction cost is low because the existing power line is used.

Since the existing power line is used when constructing the video surveillance system, there is no need to newly install the video data transmission cable, the control cable, or the power supply line for power supply, thereby saving construction costs such as construction labor cost and material cost. It is advantageous.

2) Since the network is built with the electric wires already wired, the facility is simple and it is convenient when adding a system.

When only the terminal device is connected to the power line, the PLC device is recognized and it is convenient to expand the system. For example, the current system is to extend the video data transmission cable (coaxial cable or data cable (UTP)) in order to move the camera, if the blind spot that is out of view when installing the camera, or additional installation of the camera It is possible to build a system by extending video data cable, control cable and power line from DVR server. However, the present system can solve all the methods by extending the power line.

3) No damage to finishing materials and eco-friendly.

There are few environmental hazards such as damaging expensive finishes for system expansion, noise for penetrating walls, and dust generation.

4) Easy access to various industries.

Although it recognizes the necessity of the user's video surveillance system, it can be easily applied to various markets because it can solve the inconvenience of economics, technical support for broadband network, and system expansion at one time.

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

First embodiment

3 is a block diagram of a PLC IP camera system using a power line communication (PLC) control method according to a first embodiment of the present invention.

As shown in FIG. 3, the power line communication type PLC camera interface device includes a CCD camera 111, a PLC interface device 115, a PLC modem 116, a DVR server 117, and the like. A power line 113 for supplying power is connected between the camera 111 and the PLC interface device 115 by an adapter 114, and a coaxial cable 12 for transmitting an image signal is connected. In addition, data (video signal) is transmitted between the PLC interface device 115 and the PLC modem 116 via a power line 113, and a data cable between the PLC modem 116 and the DVR server 117. (UTP) 118 transmits data.

Here, the PLC interface device 115 receives the image data from the CCD camera 111 through the coaxial cable 112, compresses and codes them, assigns an IP address, and then converts the PLC to the PLC through the power line 113. Send to modem 116. The PLC modem 116 transmits an image signal received from the PLC interface device 115 through the power line 113 to the DVR server 117 through a data cable UTP.

In the present invention, the PLC interface device 115, which combines a CCD camera that is commercially available and sold, has a part for reducing wiring work cost and system expandability which are advantages of power line communication.

Here, the PLC interface device 115, which is a core technology, can be largely divided into three functions.

Firstly, it converts analog video signal into digital signal and transmits it to PLC modem (coding method), secondly, is responsible for IP allocation, registers and handles IP address, and thirdly, power line It can be divided into the function of loading data (coupling) and extracting data portion (demodulation) from the power line.

1. Image data compression method (coding method)

There are several technical methods of image coding, and among them, image data can be coded using the methods of Motion-Joint Photograph Expert Group (M-JPEG), Motion Photograph Expert Group (MPEG) 2, and MPEG 4. . However, there can be considerable contradiction in building a system by insisting on only one of these methods, and various methods can be used according to the environment.

In other words, the coding scheme should be appropriately designed according to the following prerequisites to be examined.

① Should recording / monitoring always work or only when there is a motion or event?

② How long should the video save time be?

How much resolution and image quality do you need to determine?

4. How acceptable is the latency (time of encoding and decoding)?

⑤ What is the safety of the system and how much available network bandwidth?

In conclusion, it should be appropriately applied according to the user's needs or environment rather than the meaning of using only any coding scheme.

Currently, the most used method for surveillance cameras is the M-JPEG method. It can deliver a vivid screen without distortion of image at low bandwidth, and it is well connected with other application software, so it is adopted as international standard and many applications are programming based on JPEG. In addition, unlike other schemes, JPEG requires a lower decoding rate, enabling efficient decoding of multiple screens even on low-end PCs.

JPEG technology is a lossy compression method that begins with the very similar data values of a point in the image and its surroundings. JPEG technology mainly uses 8x8 or 16x16 blocks. After dividing one still image into 8 × 8 blocks, each block is compressed using a zigzag scanning method.

[Zigzag Scanning]

Zigzag scanning is a method of arranging 64 values by repeating zigzag as shown above. The 64 values listed through the zigzag scanning are converted into binary values using an encoding method.

2. IP  Assignment method

The method of allocating an IP address allocates an IP address using a Dynamic Host Configuration Protocol (DHCP) method. It is also recommended to add encryption or HTTPS security functions.

The reality is that you can't overlook security features on IP networks. Network systems should be built with personal security in mind. DHCP is a protocol that allows network administrators to centrally manage and assign IP addresses on networks within an organization. In the TCP / IP protocol of the Internet, each device must have a unique IP address to access the Internet. If the DHCP is not used, an IP address must be manually inputted for each device, and if the device is moved to another part of the network, a new IP address must be input. DHCP allows network administrators to centrally manage and assign IP addresses, and to automatically send new IP addresses when computers connect to other locations on the network.

The DHCP can dynamically reconfigure the network by shortening the lease period of the IP address even when there are more devices than the number of available IP addresses. DHCP provides static addresses for web servers that require permanent IP addresses. Although DHCP is a more advanced protocol, both protocols are commonly used. Although both protocols are used on a network, it is important to understand when and how to use them within the same network.

Static IP assignment is basically possible, and nowadays, due to the lack of IP, it is possible to support dynamic IP obtained through a DHCP server and divided into private IP through a router.

If you use dynamic IP, you can use dynamic IP on the Internet by using AOIP (Always On IP) service and internally allocate private IP by using private IP (192.168.x.x or 10.10..x.x). To use AOIP service, you can use IP router that supports NAT (Network Address Translation) function or NAT function of Win98 SE or higher.

3. Image data PLC  Change way

The multi-carrier method is used to convert image data into power line communication.

In the multi-carrier method, a bandwidth of a channel is composed of a plurality of carriers in an orthogonal frequency division modulation (OFDM) method. The OFDM scheme is composed of N independently modulated channels having different transmission frequencies. If each transmission frequency is properly selected, several carriers do not affect each other. In this way, the modulation transmits the image data to the power line and detects the data in reverse order.

As a channel access method, a carrier sense multiple access / collision detection collision avoidance (CSMA / CDCA) method is used. The CSMA / CDCA method can be described as a multiple access method and a collision avoidance function when interpreted as it is.

Power line communication mainly uses this channel access method because, unlike other wire communication, it sends and receives data simultaneously on the same line.

In general, wired communication uses two wires separately for transmission and reception, but power line communication cannot be used. Therefore, a method of avoiding collision is inevitably used.

In other words, if there is data to be sent by the proprietary algorithm of CDMA itself, it always monitors the use of the data to be sent, and if there is no data on the line, the data to be sent is loaded at that time.

In conclusion, the ultimate reason for using this method is that the biggest advantage of power line communication is that it does not have a new line (dedicated line).

Second embodiment

4 is a block diagram of a PLC IP camera system using a power line communication (PLC) control method according to a second embodiment of the present invention.

As shown in FIG. 4, the PLC camera interface device of the power line communication method receives, compresses and codes image data from a CCD camera 111 and a coaxial cable 112 from the CCD camera 111 and allocates an IP address. And PLC interface device 115 for converting and transmitting image data to the PLC, and supplying power through the power line 113, and a PLC modem for supplying communication and power through the PLC interface device 115 and the power line 113. A plurality of PLCs 116 and a plurality of PLC routers 120 communicating with the plurality of PLC modems 116 and data cables (UTPs) 118, the PLC routers 120, and the Internet network 121; It comprises a DVR server 122 to communicate through.

Here, the PLC interface device 115 receives the image data from the CCD camera 111 through the coaxial cable 112, compresses and codes them, assigns an IP address, and then converts the PLC to the PLC through the power line 113. Send to modem 116. The PLC modem 116 transmits an image signal received from the PLC interface device 115 through the power line 113 to the PLC router 120 through a data cable (UTP) 118. The PLC router 120 transmits the video signal received through the data cable (UTP) 118 to the DVR server 122 through the Internet network 121.

The operation method and principle of the PLC interface device 115 are the same as described in the first embodiment.

Third embodiment

5 is a configuration diagram of a local network of a PLC IP camera system using a power line communication (PLC) control method according to a third embodiment of the present invention.

As shown in FIG. 5, the PLC camera interface apparatus of the power line communication method receives and compresses image data from the CCD camera 131 and the CCD camera 131, assigns an IP address, and converts the image data into a PLC. A plurality of PLC interface local server 132 to transmit, the PLC router 134 to communicate with the plurality of PLC interface local server 132 through the power line 133, the PLC router 134 and the Internet network A local network is configured to include a main server (or DVR server) 136 of a secure branch that communicates via 135.

The PLC interface local server 132 may include the PLC interface device 115 described above or may include a PLC interface modem configured to perform the same operation therefrom and may be mounted from the CCD camera 111 through the coaxial cable 112. After receiving and compressing the image data, assigning an IP address, converting the PLC, and transmitting the PLC to the PLC router 134 through the power line 133.

Fourth embodiment

6 is a diagram illustrating a broadband network configuration of a PLC IP camera system using a power line communication (PLC) control method according to a fourth embodiment of the present invention.

As shown in FIG. 6, the PLC camera interface device of the power line communication method receives and compresses image data from the CCD camera 141 and the CCD camera 141, assigns an IP address, and converts the image data into a PLC. A plurality of PLC interface local servers 142 are transmitted and connected between the plurality of PLC interface local servers 142 by a backbone network 143. The plurality of PLC interface local servers are connected through the backbone network 143. The broadband network is configured by including the main server 151 of the integrated information center 150 that communicates with the server 142. In this case, the backbone network is a complex network structure in which wireless communication, power line communication (PLC), and optical communication are combined.

In addition, the PLC interface local server 142 is provided with the PLC interface device 115 or the PLC interface modem having the same operation therein as described above, and is mounted from the CCD camera 111 through the power line. After receiving the image data, compressing the code, assigning an IP address, converting the PLC, and transmitting the same to the main server 151 of the integrated information center 150 through the backbone network.

For reference, power line communication (PLC) refers to a communication method for transmitting and receiving data using an electric line wired for power supply.

PLC  Interface device 115

7 is a block diagram of a PLC interface device used in the present invention.

As illustrated in FIG. 7, the PLC interface device 115 includes a zero potential detector 211, a transient Ptotection and Coupling device unit 212, a power supply unit 213, PLC area unit 210 including an encoder module (214), a nonvolatile memory (NVM, Flash Memory) 215, an Ethernet device unit 216, and the like, and an encoder unit 221. ), A processor unit 222, an audio codec 223, a UART (Universal Asynchronous Receiver Transmitter) 224, an image sensor unit 225, and the like. . In addition, the configuration includes an AD / DA converter 226, a CCD camera 111, RS485, and RS232 terminals.

The zero potential detector 211 is a device for detecting a zero potential point having the least noise in the AC sine wave waveform in order to stably transmit power line communication.

The transient Ptotection and Coupling device unit 212 is configured to perform a function of directly sending contact data to the power line to send and extract data for use in the power line communication. It is a device in charge of data transmission.

The power supply unit 213 receives a power supply 220V through the power line and supplies power (DC 5V or 12V) required to the inside of the PLC interface device.

The PLC module 214 is connected to the zero potential detector, the transient protection and coupling device unit, the nonvolatile memory, and the Ethernet device unit, and is a core chip for power line communication. ) And its peripheral circuits.

The nonvolatile memory (NVM, Flash Memory) 215 stores a program for data processing and calculation through the power line communication.

The Ethernet device unit 216 is a device for converting an image signal transmitted through Ethernet.

The encoder unit 221 is connected to the Ethernet device unit 216 and compresses and codes data transmitted as an image.

The processor unit 222 manages an IP address and controls serial communication and audio input.

The audio codec 223 is configured between the processor 222 and the AD / DA converter 226 and compressively codes an audio signal.

The universal asynchronous receiver transmitter (UART) 224 is connected between the process unit 222 and an RS485 terminal and an RS232 terminal.

The image sensor unit 225 converts analog input image data input from the CCD camera 111 into digital image data and transmits the digital image data to the processor unit 222.

The PLC interface device 115 having the above configuration receives image data from the CCD camera 111 through a cable (or power line), compresses and codes the image data, allocates an IP address, converts the image data into PLC, and transmits the image data. It serves to supply power.

As described above, the present invention implements to communicate the image signal of the CCD camera 111 through the power line 113 through the PLC interface device 115, it is installed to transfer data between the CCD camera and the DVR server Coaxial cable and data cable (UTP) can be reduced, which reduces the cost of wiring work.

In addition, in the present invention, since the IP address is assigned to each CCD camera through the PLC interface device 115, not only is it possible to interwork with various products of the existing CCD camera but also a system of a broadband network through power line communication (PLC). There are advantages to build.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical spirit of the present invention, and such modifications and modifications should be considered as belonging to the appended claims. will be.

1 is a block diagram of a CCTV system according to the prior art

2 is a block diagram of a conventional IP camera system

3 is a configuration diagram of a PLC IP camera system using a power line communication (PLC) control method according to a first embodiment of the present invention

4 is a configuration diagram of a PLC IP camera system using a power line communication (PLC) control method according to a second embodiment of the present invention

5 is a configuration diagram of a local network of a PLC IP camera system using a power line communication (PLC) control method according to a third embodiment of the present invention.

6 is a broadband network configuration diagram of a PLC IP camera system using a power line communication (PLC) control method according to a fourth embodiment of the present invention

7 is a block diagram of a PLC interface device used in the present invention

[Description of Code for Major Parts of Drawing]

111: CCD camera 112: coaxial cable

113: power line 114: adapter

115: PLC interface unit 116: PLC modem

117: DVR server 118: data cable (UTP)

120: PLC router 121: Internet network

122: DVR Server

131: security camera or CCD camera

132: PLC interface local server

133: power line 134: PLC router

135: Internet

136: main server or DVR server of the security office

141: security camera or CCD camera

142: PLC interface local server

143: Main network 150: Integrated Information Center

151: main server or DVR server 201: power line

210: PLC area portion 211: Zero potential detector

212 Transient Ptotection and Coupling Device

213: power supply unit 214: PLC module

215: non-volatile memory (NVM, Flash Memory)

216 Ethernet device unit

220: IP camera area unit 221: encoder unit

222: processor unit

223 Audio Codec

224: UART (Universal Asynchronous Receiver Transmitter)

225: image sensor

226: AD / DA converter

Claims (9)

A CCD camera of a PLC camera interface device of a power line communication method; And a plurality of PLC interface local servers having a PLC interface device for receiving and compressing image data from the CCD camera, assigning an IP address, and converting and transmitting the image data. A PLC router communicating over a power line; The PLC interface device of the PLC camera interface device of the power line communication method including a DVR server for communicating with the PLC router via the Internet network, A zero potential detector for detecting a zero potential point having the least noise in the AC sine wave waveform to stably transmit power line communication; A transient protection and coupling device unit for performing data conversion and data transmission for performing a function of directly carrying out the data by directly contacting the power line to carry out the power line communication, and sending and extracting the data; A nonvolatile memory in charge of data processing and operation through the power line communication; An Ethernet device unit for converting an image signal transmitted through Ethernet; A PLC module connected to the zero potential detector, the transient protection and coupling device unit, a nonvolatile memory, and the Ethernet device unit to control the power line communication; And a power supply unit receiving power through the power line and supplying power required to the inside of the PLC interface device. And An encoder unit connected to the Ethernet device unit and compressing and coding data transmitted as an image; A processor for managing an IP address and controlling serial communication and audio input; An image sensor unit converting analog input image data input from the CCD camera into digital image data and transmitting the same to the processor; And an audio codec configured between the processor and the AD / DA converter. And an IP camera region unit having a UART (Universal Asynchronous Receiver Transmitter) connected between the process unit, the RS485 terminal, and the RS232 terminal. A CCD camera of a PLC camera interface device of a power line communication method; A plurality of PLC interface local servers having a PLC interface device for receiving and compressing image data from the CCD camera, assigning an IP address, and converting and transmitting the image data are provided between the plurality of PLC interface local servers. The PLC interface device of the PLC camera interface device of the power line communication method comprising a main server of an integrated information center connected to a main network network and communicating with the plurality of PLC interface local servers via the main network. A zero potential detector for detecting a zero potential point having the least noise in the AC sine wave waveform to stably transmit power line communication; A transient current protection and coupling device unit for performing data conversion and data transmission for performing a function of directly carrying out the data by directly contacting the power line for carrying out the power line communication, and sending and extracting and using the data; A nonvolatile memory in charge of data processing and operation through the power line communication; An Ethernet device unit for converting an image signal transmitted through Ethernet; A PLC module connected to the zero potential detector, the transient protection and coupling device unit, a nonvolatile memory, and the Ethernet device unit to control the power line communication; And a power supply unit receiving power through the power line and supplying power required to the inside of the PLC interface device. And An encoder unit connected to the Ethernet device unit and compression coding data transmitted as an image; A processor for managing an IP address and controlling serial communication and audio input; An image sensor unit converting analog input image data input from the CCD camera into digital image data and transmitting the same to the processor; And an audio codec configured between the processor and the AD / DA converter. And an IP camera region unit having a UART (Universal Asynchronous Receiver Transmitter) connected between the processor, the RS485 terminal, and the RS232 terminal. The method of claim 1, The method of compressing and coding the image data may include compressing and encoding the image data using any one of Motion-Joint Photograph Expert Group (M-JPEG), Motion Photograph Expert Group (MPEG) 2, and MPEG 4 according to the environment. PLC camera interface device of power line communication. The method of claim 1, The method of allocating the IP address is a power line communication PLC camera interface device, characterized in that for assigning an IP address using a DHCP (Dynamic Host Configuration Protocol) method. The method of claim 1, The PLC data converting method of the PLC data interface of the power line communication method, characterized in that for converting the video data by using a multi-carrier (Multi-Carrier) method. The method of claim 2, The main network is a PLC camera interface device of a power line communication method, characterized in that a hybrid network structure of a combination of wireless communication, power line communication (PLC), optical communication. The method of claim 2, The method of compressing and coding the image data may include compressing and encoding the image data using any one of Motion-Joint Photograph Expert Group (M-JPEG), Motion Photograph Expert Group (MPEG) 2, and MPEG 4 according to the environment. PLC camera interface device of the power line communication method. The method of claim 2, The method of allocating the IP address is a power line communication PLC camera interface device, characterized in that for assigning an IP address using a DHCP (Dynamic Host Configuration Protocol) method. The method of claim 2, The PLC data converting method of the PLC data interface of the power line communication method, characterized in that for converting the video data by using a multi-carrier (Multi-Carrier) method.

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