KR20090109261A - Digital video distribution system, digital video distribution device and digital video distribution system using backup line - Google Patents

Abstract

PURPOSE: A digital video distribution system, a digital video distribution device and a digital video distribution system using a backup line are provided to improve the efficiency, simplicity and profitably. CONSTITUTION: A digital video distribution system, a digital video distribution device and a digital video distribution system using a backup line transmit received image data received from a first transmission terminal to a digital video receiver. The digital video transmitter is adjacent video data in which the first transmission terminals receive from a camera. The video data which is received from the digital video transmitter are extracted and includes a digital video receiver(200) receiving the received image data.

Description

Digital video distribution system, digital video distribution device and digital video distribution system using backup line}

The present invention relates to a digital video distribution system using a digital video distribution system, a digital video distribution device, and a backup line. The present invention relates to a digital video distribution system for secure data transmission through a digital video distribution system and a digital video distribution system and a backup line.

In a digital audio / video transmission system connected by a conventional network, a configuration between a transmitting terminal and a hub receiving image data from a camera and a configuration between a receiving hub and a terminal receiving image data from a transmitting side are long. Wiring was required, and its installation was complicated, requiring professional knowledge. Here, the image data may include audio / video data captured by an analog camera, a network camera, and a camera connected to a PC, and the image server receives the image data and transmits the image data to each terminal connected by a long wire through a hub. Send it. In addition, by transmitting all images to a receiving terminal to be received by one transmitter, the load of the transmitting terminal increases, and network traffic increases in proportion to the channel.

1 is a conceptual diagram of outputting image data to a monitor using a conventional network display server.

As shown in FIG. 1, the analog video server 10 receives image data received from a plurality of cameras and transmits the image data to the network display server 20. Then, the network display server 20 reproduces the image data and outputs it to the monitor. In this way, the analog video server 10 is responsible for only long distance transmission, resulting in a low quality, low transmission frame, there is a problem that a separate network display server 20 is required.

2 shows a configuration of a conventional digital audio / video transmission system.

Korean Patent Publication (10-2005-0090788) has proposed a digital audio / video transmission system as shown in FIG.

As shown in FIG. 2, a digital video streamer (DVS) 30 and a digital video distribution amplifier (DVDA) which are the most basic components of a network-based A / V transmission system for security surveillance are shown. Amplifier 40). Here, as an example of a device that can be further interfaced to the DVDA, a conventional analog CCTV device, the matrix 42, the multiplexer 44 and the hybrid DVR 50, is shown. In FIG. 2, the DVS 30 is built into the camera and designed as a DVS integrated digital video camera (DVC) 60. The network-based digital A / V transmission system outputs both analog A / V signals output from a plurality of surveillance devices such as a video camera 32 and a microphone, and a plurality of control signals such as a camera Pan / Tilt / Zoom controller. After converting the digital data into the digital data, it is basically configured to transmit it to the DVDA 40 through the network hub. In addition, the DVDA 40 converts the received digital data into an analog signal and inversely outputs the analog CCTV device such as the matrix 42 or the multiplexer 44, as well as the conventional DVR 55, and the built-in. The digital data received through the hub can be directly transmitted to the hybrid DVR 50 as it is.

As described above, conventionally, a plurality of terminals are connected to one hub to transmit and receive data. Therefore, it is impossible to connect a plurality of DVDAs located elsewhere, and the cost and complexity of installation due to the wiring between the hub and the camera or between the hub and the plurality of DVRs are required.

Accordingly, a more efficient system configuration is required by solving the problems of wiring cost and data transmission efficiency according to the conventional system configuration.

The present invention provides a digital video distribution system using a digital video distribution system, a digital video distribution device, and a backup line, thereby eliminating the problems of conventional system configuration, wiring costs, and data transmission efficiency, and being economical, simple, safe, and efficient. The purpose is to provide a digital video distribution system that enhances the performance.

In addition, the present invention is connected to the receiving terminal and the transmitting terminal through a single communication line (connection line) to provide convenience and economics in the system configuration, the digital video receiver receives the packet data including the image data and the image data The purpose of the present invention is to improve the safety of data transmission and reception by restoring lost image data using information on error correction of the data.

In addition, an object of the present invention is to securely transmit image data through a backup line in the event of an abnormality of a hub or a communication line that acts as a relay for data transmission and reception between the digital video transmitter and the digital video receiver.

In order to achieve the above object, a digital video distribution system according to an embodiment of the present invention is a digital video transmitter for transmitting the image data received from the camera to the digital video receiver with the image data received from the neighboring first transmitting terminal and And a digital video receiver for extracting the image data to be transmitted from the image data received from the digital video transmitter and transmitting the received image data to the neighboring first receiving terminal, wherein the digital video transmitter and the digital video receiver are one. Connected to the communication line of the data communication.

According to an embodiment of the present invention, a digital video distribution device includes a video decoder for converting an analog image signal photographed through a camera into image data in a digital form, and a video compression / restore for compressing the image data or restoring the reproduced image data. A codec for adding identification information to the compressed video data to generate packet data, a video encoder for displaying the video data to a display device, and transmitting the packet data to a neighboring digital video receiver connected through one communication line. And a second port for receiving packet data transmitted from a neighboring digital video transmitter connected by one communication line.

According to another embodiment of the present invention, a digital video distribution system using a backup line includes a digital video transmitter, a second hub, and a second backup hub, each connected to a first hub and a first backup hub through one communication line, respectively. A digital video receiver connected via a communication line, wherein the first hub is connected via a communication line with the second hub and is connected with a second backup hub by one backup line, and the first backup hub is connected with the second backup hub. And a second communication line and a second hub and a backup line, the image data is transmitted through the backup line when a predetermined event occurs.

According to the digital video distribution system, the digital video distribution system and the digital video distribution system using the backup line of the present invention, there are advantages as follows.

First, there is an advantage in that the receiving terminal and the transmitting terminal are connected through one communication line to provide convenience in system configuration and economics on communication line wiring.

Second, the digital video receiver receives packet data including the image data and recovers the lost image data by using information on error correction of the image data, thereby improving the safety of data transmission and reception.

Third, when a crack occurs in the hub device or an abnormal communication line, data is transmitted through the backup line, thereby providing stable and efficient video data transmission and reception.

Fourth, we proposed a TCP-based (1: C) communication method, and have the advantages of stable data transmission and reception and distribution of terminal load.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

3 is a conceptual diagram of a logical connection configuration of a digital video distribution system according to an embodiment of the present invention.

As shown in FIG. 3, the digital video distribution system 300 may include a digital video transmitter 100 and a digital video receiver 200 connected by one communication line (connection line). Here, the digital video transmitter 100 and the digital video receiver 200 may be digital video recorder (DVR) devices. However, the present invention is not limited to the DVR apparatus, and the principles of the present invention can be applied to various image processing apparatuses. Specific components of the digital video transmitter 100 and the digital video receiver 200 will be described later with reference to FIG. 5.

The digital video transmitter 100 is connected to a neighboring digital video transmitter 101 (hereinafter, referred to as a first transmission terminal) in a communication line, and the digital video receiver 200 is also a neighboring digital video receiver ( 201 (hereinafter referred to as a first receiving terminal) and a communication line are connected to each other. In addition, the first transmitting terminal 101 is connected to other neighboring terminals 102, 103,..., 100N by one communication line, and the first receiving terminal 201 is also connected to other neighboring terminals. 202, 203, ..., 200N are connected to each other by one communication line.

To this end, the digital video transmitter 100, the first transmitting terminal 101, the digital video receiver 200, the first receiving terminal 201 and other neighboring terminals 102, 103, ..., 100N, 202 , 203, ..., 200N include a transmission port and a reception port (ie, two LAN ports) for transmitting and receiving image data in order to be connected to each other by one communication line. That is, the reception port of the digital video transmitter 100 is connected to the transmission port of the first transmission terminal 101 by one communication line to perform data communication. The receiving port of the digital video transmitter 100 receives image data from the transmitting port of the first transmitting terminal 101, and the image data received from the camera by the digital video transmitter 100 and the first transmitting terminal 101. And bundles the image data received from the N-SB together and transmits the video data to the receiving port of the digital video receiver 200 through the transmitting port of the digital video transmitter 100. The image data received from the first transmitting terminal 101 includes image data received by the first transmitting terminal 101 from another neighboring terminal connected to the first transmitting terminal 101 by one communication line.

The video data is compressed after the analog video signal is converted into a digital video signal, and is included in packet data including a parity value for error correction. When an error occurs in some data in the image data received by the parity value included in the packet data, the digital video receiver 200 uses the remaining image data blocks except the image data block in which the error occurs. Perform data recovery on the errored video data.

4 illustrates a logical configuration of an image transmission method between a digital video transmitter and a plurality of digital video receivers according to an embodiment of the present invention.

The digital video transmitter 100 transmits the image data included in the packet data to the digital video receiver 200 through one communication line (connection line). For example, the digital video transmitter 100 and the digital video receiver 200 may be connected with one line of CAT6 (1Gbps) cable without using a separate hub. In addition, the plurality of digital video receivers 200, 201, ..., 200N are connected to each other by one communication line.

In more detail, as shown in Figure 4, the TCP-based serial connection (cascade) shows how to transmit to each receiving terminal (200 ~ 200N). 4 illustrates a logical image transmission, not a physical connection. For example, when the digital video transmitter 100 transmits an image to a receiver through a communication line, the digital video receiver 200 first receives the image and then transmits the image to the first receiving terminal 201. Then, the first receiving terminal 201 transmits the image to the second receiving terminal 202, so that the second receiving terminal 202, which is logically the first terminal, receives the image. The second receiving terminal 202 receiving the image then transmits the image to the next sequence terminal. In this embodiment, the TCP-based cascade (serial connection) method is used, and the load of the transmitting terminal is increased by transmitting all the images to the receiving terminal to be transmitted by one transmitter, and the network traffic increases in proportion to the channel. To solve the problem. Therefore, since TCP uses less packet loss, receiver load does not increase due to an increase in the number of transmitters, and the network itself is unicast-based, so that traffic does not increase.

Hereinafter, components of the digital video transmitter 100 and the digital video receiver 200 will be described in detail with reference to FIG. 5.

5 is a block diagram of a digital video distribution apparatus according to an embodiment of the present invention.

The digital video distribution device 500 includes a video decoder 502, a video compression / recovery unit 504, a codec 506, a video encoder 508, and a transmission / reception port unit 510. In this case, the digital video distribution apparatus 500 may be configured with receiving / transmitting terminals including the digital video transmitter 100 and the digital video receiver 200. The digital video distribution device 500 may be applied to the system configuration of FIG. 6 according to another embodiment of the present invention. Hereinafter, each component will be described in more detail.

The video decoder 502 converts an image signal photographed through a camera into image data conforming to a broadcast signal standard (for example, NTSC or PAL). Here, the video signal input through the camera means an analog video signal supplied from a surveillance camera installed in a suitable place such as a bank, a public building, etc., and other video means that the video signal photographed using a digital camera or a PC camera. Can be targeted. The video decoder 502 may receive an analog video signal and convert it into a digital video signal.

The video compression / recovery unit 504 compresses the image data or restores the reproduced image data. Here, the video compression / restore unit 504 may compress the image data input from the video decoder 502 and output the compressed image data to a buffer memory (not shown). The image data may be defined by MPEG (Video Expert Group). It may be compressed by a compression technique or WAVELET compression technique.

The codec 506 adds identification information to compressed video data read out from the buffer memory to generate packet data. The identification information may be a kind of header information added to pure image data and information for error correction, and may include track number information, sync block position information of the track, and error correction information. That is, packet data is generated including such information, and the codec 506 interprets the image data using the information added during reproduction and stores the image data in the buffer memory. In this case, a memory area (not shown) for storing (generated) and reproduced packet data formed (generated) by the codec 506 may be configured. The dummy sync block included in the packet data may be provided to accurately detect the starting point of the track when the video head is running on the track. The track index sync block includes track number information on which image data is recorded and sync block position information of the track. Can be. The data sync block is for dividing the video data compressed by the video compression / recovery unit 504 into sync blocks of a predetermined size. Each sync block includes data and video data storing unique number information having a predetermined size. It may include a parity value of a predetermined size for error correction. On the other hand, the codec 506 interprets the image data using the identification information included in the packet data, and performs error correction using the added error correction information. That is, data recovery (error correction) may be performed on the image data in which an error occurs by using the remaining data blocks except the error (image) data block. That is, in brief, when there are n pieces of data and parity = A1 ^ A2 ^ A3 ^ An, a formula of A1 = Parity ^ A2 ^ A3 ^ An may be applied to recover A1 data.

The video encoder 508 converts the image data to be displayed through a screen display device such as a monitor.

The transmission / reception port unit 510 may be a kind of LAN port, and includes a first port 512 and a second port 514 to connect terminals to each other through one communication line and to be used for data transmission and reception through the same. Can be. That is, as described above with reference to FIGS. 3 and 4, the first port 512 may function as a transmission port, and the second port 514 may function as a reception port. In addition, in FIG. 6 to be described below according to another embodiment of the present invention, the first port 512 and the second port 514 are connected to the hub and the backup hub 610, 615, 620, and 625 in one communication line. Each may be connected and used for data transmission and reception.

More specifically, in FIGS. 3 to 4, the digital video transmitter 100 and the receiving terminals 101, 102, 103,..., 100N are used for transmitting and receiving image data through one communication line. A first port 512 (transmission port) and a second port 514 (reception port) are connected to each other by one communication line to perform data communication. In addition, as described above, the digital video transmitter 100 and the digital video receiver 200 are connected to one communication line through the transmission / reception port unit 510, and the first port 512 of the digital video transmitter 100 Data transmission and reception are performed between the second ports 514 of the digital video receiver 200. In addition, the digital video receiver 200 and the receiving terminals 201, 202,..., 200N are connected to each other via a transmission / reception port unit 510 to one communication line to perform data transmission / reception through the above-described principle. do.

Using the above-described components, the digital video transmitter 100 converts the video signal photographed through the video decoder 502 into a digital video signal, compresses the video data through the video compression / recovery unit 504, Packet data is generated through the codec 506 and transmitted to the receiving port of the digital video receiver 200 through the transmission port. Then, the digital video receiver 200 extracts the image data to be received from the packet data received through the codec 506, and then uses the additional information (or identification information) included in the packet data when the image data is reproduced. Perform interpretation and error correction on the data. Here, the image data to be received by the user may be extracted using a predetermined unique number included in the identification information. In addition, the video data reproduced through the video compression / recovery unit 504 is restored to the video data before compression, and transmitted to the video encoder 508. The video encoder 508 converts the restored image data into an image signal and then outputs the image signal to a screen display device such as a monitor. Meanwhile, the digital video receiver 200 transmits the packet data to the first receiving terminal 201 neighboring itself through the transmission / reception port unit 510, and the first receiving terminal 201 performs the same operation. The packet data is transmitted to the neighboring receiving terminal of.

6 illustrates a digital video distribution system using a backup line according to another embodiment of the present invention.

By applying the above-described principle, in the data communication of a plurality of digital video transmitters and digital video receivers, it is possible to perform more secure and convenient data transmission and reception through a backup line. Here, as described above for the backup line construction, the plurality of digital video transmitters and the digital video receivers are composed of two LAN ports (first port 512 and second port 514). A cascade may be classified into a physical connection and a logical connection. The logical connection may be configured as shown in FIG. 6, but the communication methods of the terminals of FIG. 6 are actually performed using the principle of FIG. 4. It can be seen. Hereinafter, it will be described later in more detail.

As illustrated in FIG. 6, the digital video distribution system 600 using the backup line (or backup hub) is connected to the first hub 610 and the first backup hub 615 through digital video connected through one communication line, respectively. And a digital video transmitter connected to the transmitter and the second hub 620 and the second backup hub 625 through one communication line, respectively. The first hub 610 is connected to the second hub 620 through one communication line and connected to the second backup hub 625 and the backup line, and the first backup hub 615 is the second backup hub 625. ) Is connected through a communication line, and is connected to the second hub 620 and the backup line to transmit the image data through the backup line when an event occurs.

The first hub 610 transmits the image data through a backup line connected to the second backup hub 625 when the image data is not normally transmitted to the digital video receiver due to the inability to receive the second hub 620. do. The digital video transmitter performs automatic switching to the first backup hub 615 when the image data is not normally transmitted through the predetermined communication line between the digital video transmitter and the first hub 610, and the first backup hub 615. ) And the image data are transmitted through a communication line connected between the second backup hub 625. Here, a switching module (not shown) may be included in the digital video transmitter together with the components of FIG. 5 described above.

When the image data is not transmitted through the second backup hub normally due to an abnormal occurrence (event occurrence) of the second backup hub 625, the first backup hub 615 is connected to the second hub 620. Image data is transmitted through the backup line. In addition, a sink is formed through a predetermined line (called a sink line) between the second hub 620 and the second backup hub 625 to receive image data from the second hub 620 and the second backup hub 625. Transmit to a digital video receiver. Hereinafter, a description will be given with specific examples.

A hub connected to a backup line (backup hub) is connected to each digital video transmitter and digital video receiver by one communication line. For example, the image data is transmitted from the digital video transmitter to the first hub 610 through the communication lines ①, ②, ③, ④, ⑤, and ⑥, and the first hub 610 again transmits the first hub 610 to the receiving side. The second hub 620 on the receiving side receives the image data and transmits the image data to each digital video receiver. Here, when the receiving hub (the second hub 620) cannot receive (event occurs) and the image data is not transmitted normally, it is transmitted to the second backup hub 625 through the backup line ⑬. Here, the second hub 620 and the second backup hub 625 are synchronized with the sync line to receive image data.

을 통해 제2 허브(520)로 전송된다. In addition, when the communication line ① does not operate normally (event occurs), the image data is transmitted to the second backup hub 625 through the communication line 의 of the first backup hub 615 connected to the corresponding backup line ⑦, Then, it is synchronized through the sync line to receive image data. In addition, when an abnormality occurs (event occurs) of the second backup hub 625, the backup line

It is transmitted to the second hub 520 through.

In brief, a second hub (for data transmitted through the communication line except for the communication line ① through the first hub 610 and data transmitted through the communication line 통해 through the second backup hub 625). 620 is synchronized with the second backup hub 625, and the digital video receiver receives data transmitted from both sides 620,625.

As such, when a crack occurs in the hub line or an abnormality in the communication line through the digital video distribution system using the backup line, data is transmitted through the backup line, thereby enabling stable and efficient image data transmission and reception.

Each component illustrated in FIG. 5 may be configured as a kind of 'module'. The term 'module' refers to a hardware component such as software or a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and a module plays a role. However, modules are not meant to be limited to software or hardware. The module may be configured to be in an addressable storage medium and may be configured to execute one or more processors. The functionality provided by the components and modules may be combined into a smaller number of components and modules or further separated into additional components and modules.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

1 is a conceptual diagram of outputting image data to a monitor using a conventional network display server.

2 shows a configuration of a conventional digital audio / video transmission system.

3 is a conceptual diagram of a logical connection configuration of a digital video distribution system according to an embodiment of the present invention.

4 illustrates a logical configuration of an image transmission method between a digital video transmitter and a plurality of digital video receivers according to an embodiment of the present invention.

5 is a block diagram of a digital video distribution apparatus according to an embodiment of the present invention.

6 illustrates a data communication system between a digital video transmitter and a receiver using a backup line according to an embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

100, 101, ..., 100N: Digital video transmitter on send side

200, 201, ..., 200N: Digital video receiver at receiver

300: digital video distribution system

500: digital video distribution device

502: video decoder

504: Video Compression / Restore

506 codec

508: video encoder

510: transmission and reception port

600: digital video distribution system using backup line

Claims (11)

A digital video transmitter for transmitting the image data received from the camera to the digital video receiver together with the image data received from the neighboring first transmitting terminal; And And extracting the image data to be transmitted from the image data received from the digital video transmitter, and transmitting the received image data to a neighboring first receiving terminal. And the digital video receiver is connected in one communication line to perform data communication. The method of claim 1, The digital video transmitter and the first transmission terminal include both a transmission port and a reception port for transmitting and receiving image data, and the reception port of the digital video transmitter is connected to the transmission port of the first transmission terminal by one communication line. Perform data communication, and the receiving port of the digital video transmitter receives the image data from the transmitting port of the first transmitting terminal, the image data received by the digital video transmitter from the camera and the image received from the first transmitting terminal. Data is bundled together and transmitted to the digital video receiver through a transmission port of the digital video transmitter, and the image data received from the first transmission terminal is received from another neighboring terminal connected to the first transmission terminal through a communication line. The first sending terminal A digital video distribution system comprising the received image data. The method of claim 1, The digital video receiver and the first receiving terminal include both a transmitting port and a receiving port for transmitting and receiving image data, and the transmitting port of the digital video receiver is connected to the receiving port of the first receiving terminal by one communication line. Performing data communication, and a receiving port of the first receiving terminal receives image data from a transmitting port of the digital video receiver, and connects another neighboring terminal connected to one communication line through a transmitting port of the first receiving terminal. Digital video distribution system for transmitting image data to a receiving port. The method of claim 2 or 3, The image data is transmitted in a packet data including a parity value for error correction, and the digital video receiver transmits the remaining image data except for an image data block in which an error occurs through the parity value included in the packet data. A digital video distribution system for performing data recovery on a failed image data using blocks. A video decoder for converting an analog image signal photographed through a camera into image data in a digital form; A video compression / recovery unit configured to compress the image data or restore the reproduced image data; A codec for adding identification information to the compressed image data to generate packet data; A video encoder for displaying the image data on a screen display device; A first port for transmitting the packet data to a neighboring first transmitting terminal connected by one communication line; And And a second port for receiving packet data transmitted from a neighboring first receiving terminal connected by one communication line. The method of claim 5, The identification information includes a parity value for error correction, and the codec performs data recovery on the image data in which an error occurs by using the remaining image data blocks except the image data block in which an error occurs through the parity value. Performing a digital video distribution device. A digital video transmitter connected to each of the first hub and the first backup hub through one communication line; And A digital video receiver connected via a communication line with a second hub and a second backup hub, respectively, wherein the first hub is connected via a communication line with a second hub and has one backup with the second backup hub. The first backup hub is connected to the second backup hub through one communication line and connected to the second hub and one backup line, so that transmission of image data through the backup line when a predetermined event occurs. Digital video distribution system using a backup line. The method of claim 7, wherein The first hub transmits image data through a backup line connected to the second backup hub when the image hub is not normally transmitted to the digital video receiver due to the inability to receive the second hub. Digital video distribution system using a backup line. The method of claim 8, When the image data is not normally transmitted through the predetermined communication line between the digital video transmitter and the first hub, automatic switching to the first backup hub is performed so that the first backup connected to the backup line corresponding to the communication line is performed. Digital video distribution system using a backup line, through which image data is transmitted through a hub. The method of claim 9, When the image data is not normally transmitted through the second backup hub connected to the first backup hub through one communication line, the first backup hub transmits the image data through the backup line connected to the second hub. Digital video distribution system using a backup line. The method of claim 7, wherein And the second hub and the second backup hub receive the image data and transmit the image data to the digital video receiver after performing a sync through a predetermined line.

Images