KR100399565B1 - Method and System for Transmitting Data using Asymmetric Transmission Method - Google Patents

Abstract

The present invention relates to a system and method for transmitting video and audio information using an asymmetric transmission method. In particular, the present invention provides an image conversion / detection method for digitally converting an image signal incident from a camera lens and compressing the converted digital signal. Compression means; It supports high speed internet access and remote LAN access service, high performance multiservice traffic control / installation / operation / maintenance, and provides WAN access function, and saves various variables and data necessary for CPU operation. A data processing and transmission means comprising a memory for storing information on the firmware and the peripheral device implemented to be performed, and an xDSL Co module for modulating and transmitting data applied from a CPU or demodulating data transmitted from the outside; And image processing means comprising an xDSL Cp module for demodulating and transmitting audio and video data applied from the data processing and transmission means to a host computer or modulating and transmitting data transmitted from the host computer. Therefore, according to the present invention, it is possible to transmit long distance data without a separate repeater and to process data at high speed.

Description

Method and System for Transmitting Data using Asymmetric Transmission Method

The present invention relates to a data transmission system and method using an asymmetric transmission method, and more particularly, a data transfer amount (eg, a maximum upstream speed of 8 Mbps) from a surveillance camera to a host computer from a host computer to a surveillance camera. The present invention relates to a data transmission system and a method using an asymmetric transmission method that enables long-distance data transmission using an asymmetric transmission method that is larger than a data transmission amount (eg, a maximum downstream speed of 1024 Kbps).

In general, the video surveillance apparatus is a general term for devices that monitor unattended areas or facilities unmanaged, as the scope of management of major facilities and information is expanded due to rapid industrialization and economic development. In particular, CCTV (Closed Circuit TeleVision) is one of the most commonly used video surveillance devices, and CCTV is a television system installed in a restricted area such as a shop, an office, a university campus, especially an unattended store of a bank or an ATM. It is also sent directly from the TV monitor to the recording. In recent years, such CCTVs have also been digitized to monitor or record the contents of the site through real-time monitors with digital data. Since it is connected to a television monitor, the signal does not propagate into the air. CCTV is often used as a surveillance camera system. Existing CCTV camera system has high cost (coaxial cable, multiplexer, recording device) during installation and maintenance, and because it is analog type, noise and distortion of video generated during transmission occurs. In addition, the number of users is limited as well as the installed equipment, and the distance limit in use is considerable before the use of additional expensive equipment due to the transmission characteristics of the coaxial cable. However, the network camera is a web-based digital camera system, so there is no need for a separate video cable and control equipment. Therefore, high-definition digital video can be transmitted through the Internet, and multiple users can simultaneously provide the same video in real time.

1 is a block diagram showing the configuration of a video information transmission system 100 of a conventional CCTV device using a network, the conventional video information transmission system 100 is installed in the area to be monitored a number of photographing the monitoring area Multiplexer (10), multiplexer (10) for outputting the image information input through the three CCTV cameras (C1, C2, ..., Cn), each CCTV camera (C1, C2, ..., Cn) sequentially by field or frame unit 10) A network that receives analog video information output from the system, converts / compresses it into a digital video signal, converts it into a Transmission Control Protocol / Internet Protocol (TCP / IP) packet, and transmits it to the outside through a LAN (Local Area Network) 30. Modem 40 and LAN 30 for modulating the digital video signal converted / compressed by the converter 20 and the network converter 20 into an analog video signal and transmitting it externally through a public switched telephone network (PSTN) 50. Or a host computer 60 for controlling to display the video signal transmitted through the PSTN 50 at a predetermined time unit.

The network converter 20 receives an analog video signal output from the multiplexer 10, converts / compresses it into a digital video signal, and converts each video frame into a TCP / IP packet for transmission through the LAN 30. . The signal converted to TCP / IP from the network converter 20 is directly transmitted to the host computer 60 through the LAN 30, or modulated into an analog video signal using the modem 40 to host through the PSTN 50. Transfer to computer 60. Therefore, the administrator can observe the monitoring area in real time through the LAN 30 or the PSTN 50 anytime and anywhere.

However, the video information transmission system of the conventional CCTV device using such a network network can record and search based on the hardware and software of the computer, so that the surveillance can be efficiently conducted regardless of the place and distance, and the analog video signal can be obtained. It converts to digital video signal and compresses / saves / restores it, so it is easy to manage high-definition and high-capacity information, and it is possible to search by date, time, and camera without degrading image quality due to repeated search. In case of installation, a separate coaxial cable should be added, and in case of using a telephone line, it is inconvenient to amplify a signal by installing a repeater at a certain distance for long-distance (for example, 100m or more) transmission. In other words, the expansion of coaxial cables or the installation of repeaters means an increase in cost and later maintenance costs.

Accordingly, the present invention has been made to solve the above-mentioned general problems, the first object of the present invention for monitoring by using all DSL (Digital Subscriber Line) (hereinafter referred to as 'xDSL') Implement high speed data transfer between the camera and the host computer, and set the data transfer amount from the surveillance camera to the host computer (eg, up to 8Mbps) than the data transfer amount from the host computer to the surveillance camera (eg, up to 1024Kbps) The present invention provides a data transmission system and method using an asymmetric transmission method that can be implemented to enable long-distance data transmission using an asymmetric transmission method.

It is a second object of the present invention to provide a data transmission system and method using an asymmetric transmission method that can be implemented to enable remote control of a surveillance camera through xDSL by capturing and transmitting audio information as well as video information to a host computer. There is.

1 is a block diagram showing the configuration of a video information transmission system of a conventional CCTV device using a network;

2 is a block diagram showing the configuration of a data transmission system according to the present invention;

3 is a block diagram showing the internal configuration of the xDSL Co module and xDSL Cp module,

4 is a block diagram illustrating another embodiment of the present invention;

5 is a block diagram showing another embodiment of the present invention;

6 is a flowchart illustrating the operation of a data transmission system according to the present invention.

♣ Explanation of symbols for the main parts of the drawing ♣

200: image conversion / compression means 300: data processing and transmission means

340: xDSL Co module 400: voice processing means

500: surveillance camera 600: image processing means

610: xDSL Cp module 620: host computer

1000: data transmission system

In order to achieve the above object, the present invention provides a data transmission system for transmitting data captured by a surveillance camera to a host computer. The present invention provides a digital signal for detecting and amplifying an image signal incident from a camera lens, and converting the converted digital signal. Image conversion / compression means for compressing; It supports high speed internet access and remote LAN access service, high performance multiservice traffic control / installation / operation / maintenance, and provides WAN access function, and saves various variables and data necessary for CPU operation. A data processing and transmission means comprising a memory for storing information on the firmware and the peripheral device implemented to be performed, and an xDSL Co module for modulating and transmitting data applied from a CPU or demodulating data transmitted from the outside; And an xDSL Cp module for demodulating and transmitting the audio and video data applied from the data processing and transmitting means to the host computer or modulating and transmitting the data transmitted from the host computer.

In addition, the present invention provides a data transmission method for transmitting data captured by a surveillance camera to a host computer, comprising: converting data captured from a surveillance camera or a voice processing means into a digital signal and compressing the data; Generating packet data for storing the compressed data and for transmitting the data to a host computer; Transmitting the generated packet data to a host computer using an asymmetric transmission method; And restoring, storing, and monitoring the packet data to an original signal.

Hereinafter, preferred embodiments of a data transmission system and method according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing the configuration of a data transmission system 1000 according to the present invention. The data transmission system 1000 is largely comprised of a surveillance camera 500 and an image processing means 600, and a surveillance camera. Data transmission between the 500 and the image processing means 600 is by an asymmetric transmission method. The monitoring camera 500 includes an image conversion / compression means 200, a data processing and transmission means 300, and an audio processing means 400, and the image conversion / compression means 200 includes an image detection and amplification unit ( 210, a decoder 220, a wavelet conversion module 230, a first dynamic RAM (DRAM) 240, and a field programmable gate array (FPGA) 250, and data processing and transmission means ( 300 is composed of CPU 310, second DRAM 320, flash memory 330, xDSL Co module 340, Universal Asynchronous Receiver / Transmitter (UART) 350 and Ethernet port 360, voice The processing means 400 is composed of a microphone 410, a subscriber line interface circuit (SLIC) 420, and a voice digital signal processor (DSP) 430. The image processing means 600 is composed of an xDSL Cp module 610, a host computer 620, a digital video recorder (DVR) 630, a server 640, and a monitor 650.

Surveillance camera 500 is a name for a device that is installed in a large area (eg, banks, government offices, schools, department stores, shopping centers) that are not controlled by general security equipment, such as large offices with a lot of public access, to photograph the people and facilities In other words, it includes a CCTV camera and a web camera (eg, webcam video conferencing and Fonecam). In the present invention, a generally known CCTV camera is used.

The image detection and amplification unit 210 of the image conversion / compression means 200 removes the vertical and horizontal synchronization signals from the image signal incident through the lens of the CCTV camera, detects only the pure video signal, and amplifies the signal to a predetermined level. 220 is connected to the image detection and amplification unit 210 performs a function of converting the amplified image signal into a processable digital signal. The wavelet transform module 230 compresses an image by converting a digital signal, which is connected to the decoder 220 and transformed by a discrete wavelet transform (DWT) transform. The wavelet cuts data at different frequency configurations, after which it is a mathematical function to study each configuration with the resolution applied at scale. Wavelet transforms can display images in both spatial and frequency domains, compared to conventional compression schemes (e.g. MPEG, JPEG) using discrete cosine transforms based on Fourier transforms. It has more advantages. That is, the wavelet has a feature that can efficiently represent the spatial characteristics such as the edge of the image and the frequency characteristics of the image where the energy is concentrated in the low frequency region, compared to the conventional compression method using only the characteristics of the frequency domain. . The first DRAM 240 is connected to the wavelet conversion module 230 and stores the compressed and converted image information, the FPGA 250 is connected to the wavelet conversion module 230 and the first DRAM 240 to the I / O It performs chip-to-chip communication requirements in the standard, numerous clock signal synchronizations in and out of the device, and various memory requirements management. Inside the FPGA chip, logic units called CLBs (Logic Units in Xilinx FPGAs) are uniformly arranged, and routing channels are formed between the CLBs and the CLBs for signal connections. For example, in the case of the XC400XL device, there are two flip-flops and two 4-input memory look up tables (LUTs) in one CLB. The 4-input LUT consists of 16-bit RAM and consists of 16 1-bit memory cells. You can output one of 16 patterns according to the value of 4 bits of address input with 1 or 0.

The CPU 310 of the data processing and transmission means 300 is connected to the decoder 220 and the FPGA 250, and 10Base-T Ethernet port in addition to voice through an xDSL line using data and voice integrated service and two-wire copper wire. Supports configuration, fault, performance and security management by remote management system, IP routing and bridging to facilitate high speed internet access and remote LAN access service, high performance multiservice traffic control, installation, operation, and maintenance. Built-in functions provide various xDSL-based WAN access. In the embodiment of the present invention, the CPU 310 is implemented to transmit data without loss to a long distance by using a Virata chipset having two ARM 7TDMIs. The second DRAM 320 is interconnected with the CPU 310 to store various variables and data (eg, audio and video data) required for the operation of the CPU 310, and the flash memory 330 may be a CPU. It is connected to the 310 and stores information about the firmware (Firmware) and the peripheral device implemented to perform the function of the CPU (310). The xDSL Co module 340 is interconnected with the CPU 310 and modulates voice and image data applied from the CPU 310 to be transmitted to the image processing means 600 or data transmitted from the image processing means 600. It performs the role of demodulating. At this time, since the data from the xDSL Co module 340 to the image processing means 600 is more important than the data from the image processing means 600 to the xDSL Co module 340 and the data transmission amount is large, the upstream speed is set large. do. This is in contrast to existing xDSL technology. For example, in the case of using ADSL for xDSL, the upstream speed (that is, the transmission speed from the xDSL Co module 340 to the image processing means 600) is set to 8 Mbps, and the downstream speed (that is, the video processing). Transmission rate from the means 600 to the xDSL Co module 340] is set to 640 Kbps. Here, xDSL is DSL, High Bit Rate DSL (HDSL), ADSL, Very High Data Rate DSL (VDSL), Symmetric High (SHDSL) according to transmission rate, transmission distance, upstream and downstream transmission rate ratios. -speed DSL). The CPU 310 is connected to the console to exchange data between the UART 350 that performs data communication between the CPU 310 and the console and an external device (eg, a PC, etc.) (eg, CPU upgrade, audio and video information transmission, etc.). Ethernet port 360 is connected to perform the operation.

The microphone 410 of the voice processing means 400 is installed in the vicinity of the surveillance camera 500 to capture voice, and the SLIC 420 is connected to the telephone to ring signals, hook on / off signals, and the like. Detects and interfaces voice information input / output. The voice DSP 430 is interconnected with the microphone 410 or the SLIC 420 and performs a function of converting an analog voice signal applied from the microphone 410 or the SLIC 420 into a processable digital voice signal. In general, the voice DSP 430 has a data width of 8 to 24 bits with a 6 bit block exponent and has a real time composite data I / O port and a 32 channel circular buffer for a real time multichannel DSP system. Doing. The circular buffer fills in the contiguous space of the array, and in this way fills the last item in the array, and if there is no more space to enter data, it goes back and enters the data in the first item of the array. The method of transmitting the processed voice signal uses AAL2 of ATM. AAL2 makes it easy to control packet delay by letting the application choose the optimal maximum packet length for delays, and multiplexes AAL2 packets on several active AAL2 connections to fill ATM cells, sending partially filled cells. This can reduce the inefficiency that occurs. The above-described audio processing means 400 is an additional option and is required when monitoring not only an image but also an audio signal.

The xDSL Cp module 610 of the image processing means 600 is interconnected with the xDSL Co module 340, demodulates and transmits audio and image data applied from the xDSL Co module 340 to the host computer 620, or It modulates and transmits data (eg, a remote control signal) transmitted from the host computer 620. The configuration of the xDSL Cp module 610 is almost the same as that of the xDSL Co module 340, and the data transmission speed is only different. At this time, since the data transmitted from the xDSL Cp module 610 to the xDSL Co module 340 is relatively smaller than the data transmitted from the xDSL Co module 340 to the xDSL Cp module 610, the downstream speed is set to be small. . For example, when using xDSL with ADSL, set the upstream rate (ie, transfer rate from xDSL Co module 340 to xDSL Cp module 610) to 8 Mbps, and the downstream rate (ie, xDSL Cp module). The transmission rate to the xDSL Co module 340 at 610 is set to 640 Kbps. However, the above-described transmission rate is a typical example and may be freely changed according to the surrounding environment and the communication environment. The host computer 620 stores the authorized data in the DVR 620 and transmits the data to the external server 640 or supports the display of the data through the monitor 650. It also plays a role of creating and editing data (for example, editing data transmitted from the server 640) to be transmitted to the surveillance camera 500 (for example, a remote control signal or various data signals).

The data transmission system 1000 shown in FIG. 2 is a built-in type in which the image conversion / compression means 200, the data processing and transmission means 300, and the audio processing means 400 are included in the monitoring camera 500. Only the conversion / compression means 200 is included in the monitoring camera 500, and the rest of the components (that is, the data processing and transmission means 300 and the voice processing means 400) are installed separately from the monitoring camera 500. An external data transmission system 1000 may also be implemented.

3 is a block diagram showing the internal configuration of the xDSL Co module 340 and the xDSL Cp module 610, a multi-mode DSP 710, analog front end (AFE) 720, line driver 730 and loop interface 740 is configured. The Utopia Interface is used to adjust the data format and timing between the CPU 310 and the xDSL Co module 340 and the xDSL Cp module 610 and the host computer. The multi-mode DSP 710 processes various channels and multi-function voices, and processes various data frames transmitted from the plurality of surveillance cameras 500 at high speed, and the AFE 720 is digitally connected to transmit radio waves in an analog manner. Amplifies and converts to an intermediate frequency, the line driver 730 converts general input / output instructions into a form of a message that can be processed, including a driving program that supports interaction, and the loop interface 740 is external (eg, an xDSL Co module). Interface 340 and the xDSL Cp module 610 with each other for interfacing data format and operation speed.

FIG. 4 is a block diagram illustrating another embodiment of the present invention, in which data (that is, video or audio signals) transmitted from a plurality of surveillance cameras 810 using the multiplexer 820 is sequentially converted in units of fields or frames. May be output to the host computer 620 for asymmetrical transmission. The asymmetric transmission scheme between the xDSL Co module 340 and the xDSL Cp module 610 is described in FIG. 2 and FIG. 3 and will not be described in detail herein.

5 is a block diagram illustrating another embodiment of the present invention, in which an xDSL Co module 340 is embedded in each surveillance camera 910 to exchange data with a host computer 620 through an xDSL Cp module 610. This can be implemented to be done. Since the xDSL Cp module 610 has a built-in multi-mode DSP 710, the xDSL Cp module 610 may perform the function of the multiplexer 820 of FIG. 4. The asymmetric transmission scheme between the xDSL Co module 340 and the xDSL Cp module 610 is described in FIG. 2 and FIG. 3 and will not be described in detail herein.

Hereinafter, an operation relationship of a data transmission system and method using an asymmetric transmission method according to the present invention will be described in more detail with reference to the accompanying drawings.

6 is a flowchart illustrating an operation of a data transmission system according to the present invention. The present transmission system is implemented to process not only a video signal but also an audio signal, and a surveillance camera and a host computer are asymmetric network (eg, Assume that the connection is made through an xDSL network. However, the processing of the audio signal is an option of the present invention, and it is natural that it can be implemented to process only the video signal.

First, it is determined whether an image signal is captured through a surveillance camera lens or an audio signal is captured through a microphone or a phone (S610). When the image signal is captured (S620), the image signal is amplified and captured by the image detection and amplification unit. After digital conversion, the Wavelet transform module converts and compresses the corresponding video signal to a DWT (Discrete Wavelet Transform) (S630). As a result of the determination in step S620, if the captured signal is a voice signal, the voice signal is converted into a processable digital signal using a voice DSP and transmitted to the CPU (S640).

The CPU receives the compressed video signal or the converted audio signal and stores the same in the second DRAM and applies the corresponding data to the xDSL Co module. The xDSL Co module generates packet data consisting of respective frames for transmitting an applied video or audio signal, and transmits the packet data to the xDSL Cp module in an asymmetric transmission method (S660). The asymmetric transmission scheme used in the present invention is opposite to the conventional asymmetric transmission scheme, since the data transmitted from the xDSL Co module to the xDSL Cp module is more important than the data transmitted from the xDSL Cp module to the xDSL Co module and the data transmission amount is much larger. Set the upstream speed high. For example, set the upstream speed from the xDSL Co module to the xDSL Cp module at 8 Mbps and the downstream speed from the xDSL Cp module to the xDSL Co module at 640 Kbps. Therefore, it is possible to process the data captured by the surveillance camera at high speed, and by transmitting the data using a network, it can be transmitted to a longer distance without a separate repeater. The xDSL Cp module receives the packet data transmitted from the xDSL Co module and restores the original video or audio signal to the host computer, and the host computer processes the data to be stored on the DVR, transmitted to an external server, or displayed on the monitor. (S670).

The foregoing description has described data transmission from the xDSL Co module to the xDSL Cp module, and data transmission from the xDSL Cp module to the xDSL Co module is performed in the reverse order. Data transmission from the xDSL Cp module to the xDSL Co module is set to maintain a low stream rate because the amount of data is relatively small. Therefore, the surveillance camera can be remotely controlled from the host computer through the network using xDSL.

The above description is only for explaining one embodiment, and the present invention is not limited to the above-described embodiment and can be variously changed within the scope of the appended claims. For example, the shape and structure of each component specifically shown in the embodiments of the present invention may be modified.

As described above, according to the data transmission system and method using the asymmetric transmission method according to the present invention, a network network is implemented to enable high-speed data transmission between the surveillance camera and the host computer using xDSL, and the surveillance camera hosts By using an asymmetric transmission method that sets the data transmission amount (for example, up to 8Mbps) to the computer from the host computer to the surveillance camera (for example, up to 1024Kbps), long distance data transmission is possible without a separate repeater. This has the effect of processing data.

In addition, there is an effect that can be implemented to enable the remote control of the surveillance camera through the xDSL by capturing and transmitting the audio signal as well as the video signal to the host computer.

In addition, by processing the data transmitted from each surveillance camera using a multiplexer, there is an effect that can monitor a wider location.

Claims (9)

In the data transmission system for transferring the data captured by the surveillance camera to the host computer, Image conversion / compression means for detecting and amplifying an image signal incident from a camera lens, digitally converting the same, and compressing the converted digital signal; Supports high speed internet access and remote LAN access service, high performance multiservice traffic control / installation / operation / maintenance and provides WAN access function, and stores various variables and data necessary for the operation of the CPU. Data processing and transmission means comprising a memory for storing information about a firmware and a peripheral device implemented to perform a function, and an xDSL Co module for modulating and transmitting the data applied from the CPU or demodulating data transmitted from the outside; Image processing means comprising an xDSL Cp module for demodulating and transmitting audio and video data applied from the data processing and transmitting means to the host computer or modulating and transmitting data transmitted from the host computer; And A voice processing means comprising a voice DSP for converting a voice signal captured by the microphone and a voice signal applied from the telephone into a processable digital voice signal, The data processing and transmission means further comprises a universal asynchronous transmission and reception unit (UART) connected to the console for performing data communication between the CPU and the console and an Ethernet port for performing data exchange with an external device, The data exchange between the data processing and transmitting means and the image processing means is made through a network network, and the upstream speed from the data processing and transmitting means to the image processing means is converted from the image processing means to the data processing and transmitting means. A data transmission system using an asymmetric transmission method, characterized in that it is set larger than the downstream rate to. The data transmission system using an asymmetric transmission method according to claim 1, wherein said video conversion / compression means and said data processing and transmission means are incorporated in said surveillance camera. delete delete delete The data transmission system of claim 1, wherein the network uses any one of xDSL. In the data transmission method for transmitting the data captured by the surveillance camera to the host computer, Converting and capturing data captured from the surveillance camera or the voice processing means into a digital signal; Generating packet data for storing the compressed data and for transmitting the data to the host computer; Transmitting the generated packet data to the host computer using an asymmetric transmission method; And Restoring, storing and monitoring the packet data to an original signal; The data exchange between the surveillance camera and the host computer is performed through a network network, and the upstream speed from the surveillance camera to the host computer is set to be larger than the downstream speed from the host computer to the surveillance camera. A data transmission method using an asymmetric transmission method characterized in that. delete 10. The method of claim 7, wherein the network uses any one of xDSLs.