KR20030065738A - A embeded visual data transmission device using USB interface. - Google Patents

A embeded visual data transmission device using USB interface. Download PDF

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Publication number
KR20030065738A
KR20030065738A KR1020020005479A KR20020005479A KR20030065738A KR 20030065738 A KR20030065738 A KR 20030065738A KR 1020020005479 A KR1020020005479 A KR 1020020005479A KR 20020005479 A KR20020005479 A KR 20020005479A KR 20030065738 A KR20030065738 A KR 20030065738A
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South Korea
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image
web server
embedded
internet
logic
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KR1020020005479A
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Korean (ko)
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장창호
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(주)공유 소사이어티
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Priority to KR1020020005479A priority Critical patent/KR20030065738A/en
Publication of KR20030065738A publication Critical patent/KR20030065738A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2381—Adapting the multiplex stream to a specific network, e.g. an Internet Protocol [IP] network
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
    • G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/21—Server components or server architectures
    • H04N21/222—Secondary servers, e.g. proxy server, cable television Head-end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F2213/0042—Universal serial bus [USB]

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

PURPOSE: An image transmission embedded device utilizing a USB interface is provided to transmit images of at least one PC camera through the Internet in real time. CONSTITUTION: An embedded device(200) having a USB interface(210) includes a USB socket for connecting a USB port to a PC camera(110), a logic for receiving an image, compressing and encoding the received image, and a logic for buffering the compressed video data. The embedded device further includes a built-in web server and operation system for transmitting the video data through the Internet(300), an Ethernet interface(220) through which the web server is connected to the Internet, and an ActiveX control module for decoding the encoded image. The built-in operation system is embedded Linux and the web server is embedded Apache.

Description

USB 인터페이스를 활용한 화상전송 임베디드 디바이스{A embeded visual data transmission device using USB interface.}A embeded visual data transmission device using USB interface.}

본 발명은 한대 또는 그 이상의 PC 카메라에 연결되어 카메라의 영상을 인터넷을 통하여 실시간으로 전송하는 임베디드 장치에 관한 것이다.The present invention relates to an embedded device which is connected to one or more PC cameras and transmits images of the cameras in real time through the Internet.

종래에는 PC 카메라의 영상을 인터넷을 통해 전송하기 위해서 PC카메라를 영상압축 소프트웨어와 연동된 웹서버 시스템에 연결하여야 했다. 이러한 시스템을 구축하기 위해서는 웹서버 장비의 설정과 웹서버 소프트웨어의 설치 및 영상압축 소프트웨어와의 연동 문제 등 기술적으로 복잡한 절차를 거쳐야 했으며, 따라서 시스템의 유지보수도 용이하지 않았다. 이러한 문제를 해결하기 위해 웹서버기능이 내장된 PC카메라가 상용제품으로 나와있으나 이미 장착된 단 하나의 카메라 이외에는 다른 종류의 카메라를 사용할 수 없다는 결점과 그 결과 전송되는 영상 프레임의 해상도 및 크기가 한정된다는 제한이 존재한다.Conventionally, in order to transmit a PC camera image through the Internet, the PC camera has to be connected to a web server system linked with image compression software. In order to construct such a system, technical complicated procedures such as setting up the web server equipment, installing the web server software, and interworking with the image compression software were required. Therefore, the maintenance of the system was not easy. In order to solve this problem, PC camera with built-in web server function is shown as a commercial product, but it is not possible to use other types of cameras except the one already installed, and the resolution and size of the transmitted video frame are limited. There is a limitation.

PC 카메라의 영상을 인터넷을 통해 전송하고자 할 경우, 다양한 영상 사양을 지원하기 위해서는 카메라의 종류를 교체할 수 있으며 실시간으로 영상을 압축할 수 있어야 한다. 또한 설치 및 유지보수가 편리해야 한다. 여러 각도에서 여러 대의 PC카메라가 촬영하는 영상들을 전송해야 하는 필요성도 점차 증대하고 있다. 이에 본 발명은 USB 인터페이스를 통해 여러 대의 PC 카메라와 연결하여 사용할 수 있으며 영상압축 및 암호화 기능이 있는 웹서버가 내장된 장치를 제시한다.If you want to transfer the video from PC cameras over the Internet, you need to be able to switch camera types and compress video in real time to support various video specifications. It should also be convenient to install and maintain. The need to transfer images from multiple PC cameras from different angles is also increasing. Accordingly, the present invention provides a device with a built-in web server that can be used by connecting to a plurality of PC cameras via a USB interface and has a video compression and encryption function.

도1: 화상전송 임베디드 디바이스의 사용예를 나타내는 대표도.1 is a representative diagram showing an example of use of an image transmission embedded device.

도2: 화상전송 임베디드 디바이스의 구성 요소들을 나타내는 블럭도.2 is a block diagram showing components of an image transmission embedded device.

도3. 영상신호 암호화로직에 사용된 암호화 회로.Figure 3. Encryption circuit used for video signal encryption logic.

도4. 영상신호 복호화 ActiveX 컨트롤의 COM 인터페이스 구조.Figure 4. COM interface structure of video signal decoding ActiveX control.

이하에서는 상기의 목적을 달성하기 위하여 본 발명이 제시하는 화상전송 임베디드 디바이스의 구성 및 작용에 대하여 첨부된 도면을 참고하여 설명하고자 한다.Hereinafter, with reference to the accompanying drawings for the configuration and operation of the image transmission embedded device proposed by the present invention to achieve the above object.

도1은 상기 화상전송 임베디드 디바이스의 사용예를 나타내는 도면이다.1 is a diagram showing an example of use of the image transmission embedded device.

도1을 참조하여 설명하면 화상전송 디바이스(200)는 한 대 또는 그 이상의 PC 카메라들(100 또는 110)과 USB 인터페이스(210)를 통해 연결된다. 화상전송 디바이스(200)는 카메라 영상들을 압축하고 필요에 따라 암호화하여 Ethernet 인터페이스(220)를 통해 웹서비스 형태로 전송한다. 수신자(310) 측은 인터넷(300)을 통해 기존의 PC에서 웹브라우저 등을 통해 영상을 전송받게 된다.Referring to FIG. 1, the image transmission device 200 is connected to one or more PC cameras 100 or 110 through the USB interface 210. The image transmission device 200 compresses the camera images, encrypts them as necessary, and transmits them as a web service through the Ethernet interface 220. The receiver 310 receives an image through a web browser from an existing PC through the Internet 300.

도2는 본 발명의 핵심 요소들을 나타내는 구성도이다.2 is a block diagram showing key elements of the present invention.

도2를 참조하여 설명하면, 상기 화상전송 디바이스(200)는 PC 카메라(110)에서 출력되는 영상 신호를 USB 인터페이스(210)를 통해 영상신호 수신로직(410)으로 받아들인다. 이 로직을 통해 받아들여진 신호는 영상신호 압축로직(420)이 압축을 하여 영상신호 프레임버퍼(430)에 저장한다. 이때, 사용자의 설정에 따라 압축된 영상 신호는 프레임버퍼(430)로 저장되기 전에 영상신호 암호화로직(440)을 통해 암호화될 수 있다. 내장 웹서버 및 운영체제 로직(450)은 Ethernet 인터페이스(220)을 통해서 외부 수신자(310)에서 전송요구가 있을 경우 프레임버퍼(430)에 저장된 영상 프레임을 스트리밍한다. 내장 웹서버 및 운영체제 로직은 System-On-Chip Embedded 프로세서(460)에 의해 동작한다.Referring to FIG. 2, the image transmission device 200 receives an image signal output from the PC camera 110 as an image signal reception logic 410 through the USB interface 210. The signal received through this logic is compressed by the video signal compression logic 420 and stored in the video signal frame buffer 430. In this case, the compressed video signal according to the user's setting may be encrypted through the video signal encryption logic 440 before being stored in the frame buffer 430. The embedded web server and operating system logic 450 streams an image frame stored in the frame buffer 430 when a transmission request is received from the external receiver 310 through the Ethernet interface 220. Embedded web server and operating system logic is operated by the System-On-Chip Embedded Processor 460.

도3은 영상신호 암호화로직(410)에 사용된 암호화 회로의 예를 나타낸다. 암호화 방식은 x^ 9 + X^ 5 + x^ 1 다항식을 이용한 비트 스크램블(bit scramble) 방식으로서, 스크램블 되는 비트의 시작 위치만을 조정함으로써 안전하고 빠른 암호화가 가능하며, 스크램블되된 데이터는 0(LOW) 과 1(HIGH) 의 분포가 무작위적으로 되는 경향이 있기 때문에 네트워크 전송 오류를 줄일 수 있다는 부수적인 장점을 가지고 있다.3 shows an example of an encryption circuit used in the video signal encryption logic 410. The encryption method is a bit scramble method using x ^ 9 + X ^ 5 + x ^ 1 polynomial.It is possible to secure and fast encryption by adjusting only the start position of the scrambled bit, and the scrambled data is 0 ( LOW) and 1 (HIGH) tend to be random, which has the side-effect of reducing network transmission errors.

도4는 도2에서의 영상신호 복호화 ActiveX 컨트롤(510)의 COM 인터페이스 구조를 나타낸다. 복호화 컨트롤(510) 모듈은 롬(ROM)에 저장되어 있다가 영상신호가 암호화될 경우에만 웹서버(450)를 통해 수신자(310)에게 자동적으로 다운로드된다. 이 컨트롤(510)은 도3의 회로에 의해 스크램블된 영상 데이터를 디스크램블(descramble)한다. GetScrambleOffset() 함수는 화상전송 디바이스(200)로부터 스크램블되는 비트의 시작 위치에 대한 정보를 받을 때 사용하는 함수이다. SetScrambleOffset() 함수는 복호화 컨트롤(510)의 디스크램블할 비트의 시작 위치를 지정하기 위한 함수이다. Descramble() 함수는 전송받은 데이터를 디스램블시키는 함수이다.4 illustrates a COM interface structure of the video signal decoding ActiveX control 510 of FIG. 2. The decryption control 510 module is stored in the ROM and is automatically downloaded to the receiver 310 through the web server 450 only when the video signal is encrypted. This control 510 descrambles the video data scrambled by the circuit of FIG. The GetScrambleOffset () function is a function used when receiving information on the start position of the scrambled bit from the image transmission device 200. The SetScrambleOffset () function is a function for specifying the start position of a bit to be descrambled of the decoding control 510. Descramble () is a function that descrambles the received data.

위에서 기술한 바와 같이, 본 발명은 한대 이상의 PC 카메라의 영상을 실시간으로 압축하고 암호화한 후 웹서버를 통해 인터넷에 연결된 수신자에게 전송하는 기능을 가진 임베디드 디바이스로서, 이 디바이스의 사용자는 여러 위치와 각도에서 원하는 지점의 영상 정보를 인터넷으로 전송할 수 있게 된다. 본 발명은 USB 인터페이스를 사용함으로써 한대 이상의 PC 카메라를 연결하여 사용할 수 있는 효과를 거두고 있다. 또한 본 발명은 다양한 PC 카메라와 연결하여 사용할 수 있으므로 사용자는 필요한 해상도 및 프레임 크기를 지원하는 카메라를 연결하는 것만으로 간편하게 원하는 화질의 영상을 인터넷으로 전송할 수 있다. 아울러 볼 발명은 임베디드 시스템으로서 소형화할 수 있으므로 설치가 간편하고 유지보수가 용이하다는 효과가 있다.As described above, the present invention is an embedded device having a function of compressing and encrypting images of one or more PC cameras in real time and transmitting them to a receiver connected to the Internet through a web server. Will be able to send the video information of the desired point to the Internet The present invention has the effect that can be used by connecting one or more PC camera by using a USB interface. In addition, the present invention can be used in connection with a variety of PC cameras, the user can simply transfer a video of the desired image quality to the Internet simply by connecting a camera that supports the required resolution and frame size. In addition, the ball invention can be miniaturized as an embedded system has the effect of easy installation and easy maintenance.

Claims (3)

USB 인터페이스를 가지는 화상 전송 장치에 있어서;An image transmission apparatus having a USB interface; USB 포트로 촬영 영상을 출력하는 PC 카메라와 연결하기 위한 USB 소켓과;A USB socket for connecting to a PC camera for outputting a shot image through a USB port; 영상을 수신하고 수신한 영상 데이터를 압축하고 암호화하는 로직;Logic for receiving an image and compressing and encrypting the received image data; 압축된 영상 데이터를 버퍼링하는 로직;Logic to buffer the compressed image data; 영상 데이터를 인터넷을 통해 전송하는 내장형 웹서버 및 운영체제;An embedded web server and an operating system for transmitting image data through the Internet; 상기 웹서버가 인터넷에 연결될 수 있게 하는 Ethernet 인터페이스;An Ethernet interface allowing the web server to be connected to the Internet; 그리고 암호화된 영상을 복호화하기 위한 ActiveX 컨트롤 모듈을 포함하는 것을 특징으로 하는 임베디드 장치.And an ActiveX control module for decrypting the encrypted image. 제 1항에 있어서,The method of claim 1, 상기 내장형 운영체제는 Embedded Linux 이고 웹서버는 Embedded Apache 인 것을 특징으로 하는 화상 전송 장치.The embedded operating system is Embedded Linux and the web server is an image transmission device, characterized in that the embedded Apache. 제 1항에 있어서,The method of claim 1, 상기 영상 데이터를 암호화하는 로직은 다항식을 이용한 비트 스크램블(bit scramble) 방식인 것을 특징으로 하는 화상 전송 장치.And the logic for encrypting the image data is a bit scramble method using a polynomial.
KR1020020005479A 2002-01-30 2002-01-30 A embeded visual data transmission device using USB interface. KR20030065738A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980055671A (en) * 1996-12-28 1998-09-25 구자홍 Image Processing Method Using Universal Serial Bus
KR20010001274A (en) * 1999-06-03 2001-01-05 박현규 Internet Image Observation System
KR20020087158A (en) * 2001-05-14 2002-11-22 삼성전자 주식회사 Method for embodying internet video phone using universal serial bus in mobile telecommunication terminal
KR20020087520A (en) * 2001-05-14 2002-11-23 주식회사 성진씨앤씨 Pc-based digital video recorder system with a multiple of usb cameras

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980055671A (en) * 1996-12-28 1998-09-25 구자홍 Image Processing Method Using Universal Serial Bus
KR20010001274A (en) * 1999-06-03 2001-01-05 박현규 Internet Image Observation System
KR20020087158A (en) * 2001-05-14 2002-11-22 삼성전자 주식회사 Method for embodying internet video phone using universal serial bus in mobile telecommunication terminal
KR20020087520A (en) * 2001-05-14 2002-11-23 주식회사 성진씨앤씨 Pc-based digital video recorder system with a multiple of usb cameras

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