WO2004071098A1 - Transmission video parallele - Google Patents

Transmission video parallele Download PDF

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Publication number
WO2004071098A1
WO2004071098A1 PCT/IL2003/000092 IL0300092W WO2004071098A1 WO 2004071098 A1 WO2004071098 A1 WO 2004071098A1 IL 0300092 W IL0300092 W IL 0300092W WO 2004071098 A1 WO2004071098 A1 WO 2004071098A1
Authority
WO
WIPO (PCT)
Prior art keywords
streams
quality
video
stream
encoding
Prior art date
Application number
PCT/IL2003/000092
Other languages
English (en)
Inventor
Aviad Hellman
Original Assignee
Video Domain Technologies Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Video Domain Technologies Ltd. filed Critical Video Domain Technologies Ltd.
Priority to PCT/IL2003/000092 priority Critical patent/WO2004071098A1/fr
Priority to AU2003206108A priority patent/AU2003206108A1/en
Publication of WO2004071098A1 publication Critical patent/WO2004071098A1/fr

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19663—Surveillance related processing done local to the camera
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19654—Details concerning communication with a camera
    • G08B13/19656—Network used to communicate with a camera, e.g. WAN, LAN, Internet
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19665—Details related to the storage of video surveillance data
    • G08B13/19667—Details realated to data compression, encryption or encoding, e.g. resolution modes for reducing data volume to lower transmission bandwidth or memory requirements
    • 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
    • H04N21/218—Source of audio or video content, e.g. local disk arrays
    • H04N21/2187—Live feed
    • 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
    • H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
    • H04N21/23439—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements for generating different versions
    • 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
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/2662—Controlling the complexity of the video stream, e.g. by scaling the resolution or bitrate of the video stream based on the client capabilities
    • 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]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/422—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS]
    • H04N21/4223—Cameras
    • 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]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
    • H04N21/44029—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display for generating different versions
    • 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]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4621—Controlling the complexity of the content stream or additional data, e.g. lowering the resolution or bit-rate of the video stream for a mobile client with a small screen

Definitions

  • the present invention is related to real-time video transmissions and specifically to video surveillance camera transmissions.
  • Surveillance cameras typically generate an analog real-time video stream.
  • the analog video stream is transferred to a viewing station and/or to a storage station.
  • the analog video stream is transferred to an analog to digital (A D) converter (also known as a video decoder), which converts the analog stream into a digital video stream.
  • a D analog to digital
  • the digital video stream is encoded, by an encoder, in order to reduce its bandwidth for transmission through standard computer networks.
  • the encoded video stream is referred to as video data.
  • a surveillance camera transmits the video stream to a predetermined field station, where the stream is viewed, stored or analyzed, hi some systems, the encoded data is stored locally near the camera, in addition to its transmission to the field station.
  • the digital video stream includes a data amount which depends on parameters of the digital stream.
  • the digital stream parameters optionally include resolution, frame rate and the number of bits representing each pixel.
  • resolutions of 640x480 pixels, 320x240 pixels, 160x120 pixels are currently used in many video applications.
  • the frame rate refers to the number of images appearing in a video stream in a given period, and is generally given in terms of frames per second (FPS). Commonly used FPS values are 30, 25, 15 and 7.5.
  • the number of bits used for representing each pixel refers to the number of possible values each pixel may have to represent its color and/or its shade, for example in black and white images. Typical values are 8 bits per pixel (BPP), 16 BPP and 24 BPP.
  • the encoder is generally configured with a compression rate to apply to the video stream it receives.
  • the compression rate is generally a compromise between image quality and data size. The higher the quality level selected for a video stream, the more accurate the image is and the more likely the image will be useful. On the other hand, a higher quality level video stream needs a greater amount of memory to store and a greater bandwidth to transmit.
  • the quality may be changed by changing one or more parameters of the video stream, as discussed above.
  • video images are supplied at a low quality level in order to reduce storage consumption or bandwidth usage, for example for local long term backup or remote monitors.
  • video images are supplied at a high level quality for example for local viewing or short term backup.
  • a high quality stream requires between two to four times the storage space of a low quality stream.
  • US patent 6,014,694 to Aharoni et al. the disclosure of which is incorporated herein by reference, describes a system for video transport over networks having available bandwidths that vary with time and location.
  • the video stream is encoded as multiple levels of quality, providing incremental information.
  • a client receives a subset of the multiple levels, to reconstruct a video stream of a specific quality level, according to the clients reception capability.
  • An aspect of some embodiments of the invention relates to a surveillance system which provides real-time video images from a surveillance camera, concurrently in a plurality of self contained streams of different quality levels and/or different bandwidths.
  • Each stream can be viewed by a receiving client separately, without requiring data from any of the other streams.
  • the streams may have different quality levels due to their including video streams of different parameters and/or data streams of different compression levels (representing video streams of same or different parameters).
  • the different streams are generated by an encoder located in a single casing with the surveillance camera.
  • the encoder is located remote from the surveillance camera, for example at a switch servicing the surveillance camera.
  • each of the streams comprises a data stream generated from a video stream and not from any other data stream, fri some embodiments of the invention, the plurality of streams comprises data streams generated in parallel by a single encoder from one or more video streams and not from other encoded data streams.
  • the generated streams are transmitted through a network interface.
  • the generated streams are optionally transmitted together along a same communication link.
  • all the streams are transmitted to a single client.
  • the streams are directed to different clients, each client receiving a stream at a quality level determined according to the usage of the stream.
  • a client which stores the images from the camera optionally receives a low quality stream
  • a client which displays and/or analyses the images optionally receives a high quahty stream.
  • the quality level of the stream transmitted to each client is determined without relation to the bandwidth of the connection to the client.
  • the quality levels of the streams transmitted to the client are predetermined and do not change due to changes in the bandwidth of the connections of the clients to the camera.
  • one or more of the streams are stored locally in a storage medium associated with the surveillance camera.
  • different processing paths for example including different apparatus and/or different software processes, which do not share intermediate results.
  • the different streams are generated by same apparatus using one or more common intermediate results.
  • a method of transmitting live video content to a field station comprising receiving a real-time raw video stream from a camera of a surveillance unit, encoding the raw video stream into multiple self contained video or data streams with different levels of quality, and providing the multiple self contained video or data streams to one or more storage or surveillance units.
  • receiving the real-time video stream comprises receiving an analog video stream.
  • receiving the real-time video stream comprises receiving a digital video stream.
  • providing the multiple video or data streams comprises transmitting the multiple streams through a same network interface.
  • providing the multiple video or data streams comprises transmitting the multiple streams to a same surveillance station.
  • providing the multiple video or data streams comprises storing at least one of the streams in a storage medium coupled to the camera.
  • encoding the raw video stream into multiple streams with different levels of quality comprises encoding into streams of levels of quality selected according to the intended usage of the streams.
  • encoding the raw video stream into multiple streams with different levels of quality comprises encoding into a low quality stream for storage and a high quality stream for display.
  • encoding the raw video stream into multiple self contained streams with different levels of quality comprises encoding into streams having levels of quality selected without relation to the bandwidth of a connection on which the streams are transmitted.
  • encoding the raw video stream into multiple self contained streams comprises performing separate encoding for each resultant stream, without using common intermediate results.
  • encoding the raw video stream into multiple self contained streams comprises performing at least one same encoding task resulting in an intermediate result used in generating all the encoded streams.
  • a system for transmitting live video content from a surveillance camera to field stations comprising a surveillance camera adapted to supply a raw video stream, an encoder adapted to encode the raw video stream into multiple self contained video streams of different levels of quality and a transmitter adapted to transmit the multiple streams to at least one field station.
  • the encoder is adapted to encode the raw video stream in accordance with a plurality of different compression methods.
  • FIG. 1 is a schematic illustration of a surveillance system according to an exemplary embodiment of the invention
  • Fig. 2 is a flow diagram of the process of distributing multiple levels of content in accordance with an exemplary embodiment of the invention.
  • FIG. 3 is a schematic illustration of a surveillance system, in accordance with an exemplary embodiment of the invention.
  • Fig. 1 is an illustration of a surveillance system 100 according to an exemplary embodiment of the invention.
  • a surveillance unit 101 includes a camera 110 which provides real-time video images of a monitored location. Tlie real-time video images may be included in a full frame rate stream or in a reduced frame rate stream.
  • the real time video images are transferred to a conversion unit 120 which encodes the video images into a plurality of separate data streams of different quahty levels.
  • the data streams of different quality levels may be based on video streams of different parameters (e.g., frame rates, resolutions, pixels per bit) and/or based on different compression methods and/or compression rates.
  • the data streams are optionally transmitted over a network 130 to one or more field stations 140. It is noted that although a plurality of field stations 140 are shown, the invention may be used in a system with only a single field station 140.
  • network 130 comprises a local area network.
  • network 130 comprises a public and/or private (e.g., used only for surveillance system 100) wide area network such as the Internet or an Intranet.
  • Network 130 optionally includes a PSDN (packet switching data network) and/or an ATM network, although switched networks (including, for example, xDSL, VBM and/or ISDN links) and/or other networks maybe used for some or even all of the segments of the network.
  • PSDN packet switching data network
  • ATM network including, for example, xDSL, VBM and/or ISDN links
  • network 130 connects to all of field stations 140 with a same bandwidth.
  • different field stations 140 are connected with different bandwidths.
  • the network bandwidth to a specific station imposes a limitation on the quality level of the data stream that can be supplied to the station 140. If a station 140 cannot keep up with the content of a stream it will either fall behind in the stream and not represent a real time video stream or will need to drop frames thus effectively reduce quality.
  • field stations 140 comprise monitor terminals for viewing by human guards and/or computers which perform image analysis of the images.
  • field stations 140 comprise storage devices or computers which record images for retrieval in case of necessity. Based on a station's connection bandwidth and on the station's task, some stations 140 require a real time stream with content of a high quality level as described above and some stations 140 require content of a lower quality level.
  • one or more field stations 140 receive a plurality of data streams of different quality levels. For example, a first quality level stream may be transmitted for storage and a second quality level stream may be transmitted for display.
  • Fig. 2 is a flow diagram 300 of a process of distributing surveillance video images in a plurality of data streams of different quality levels, in accordance with an exemplary embodiment of the invention
  • -h conversion unit 120 310
  • an analog to digital (A/D) converter 190 Fig. 1 receives an analog real-time video stream from surveillance camera 110 and optionally (320) prepares multiple digital video streams 180 of different levels of quality.
  • the video streams may differ in frame rate, resolution and/or color encoding.
  • A/D converter 190 generating the plurality of streams 180
  • a separate scaling and/or color/space converter receives from A/D converter 190 a single digital video stream and converts the received stream into a plurality of streams 180 having different parameters.
  • a plurality of analog video streams with different parameters are generated before they are provided to A/D converter 190, and the converter performs the conversion to digital for each stream separately.
  • each digital video stream 180 is compressed into a respective data stream 185, by an encoder 195.
  • Encoder 195 optionally uses any suitable compression method known in the art, such as MPEG 1 or MPEG 2.
  • different compression methods are applied to different video streams 180.
  • different compression ratios are applied to different video streams 180, in order to achieve data streams 185 of different quality levels.
  • the same compression ratio is applied to all the different video streams 180, and the different quality levels of data streams 185 are achieved based on the different parameters of the video streams 180.
  • data streams 185 are (340) transferred through a combiner 170 which combines data streams 185 for transmission onto network 130.
  • (350) the resulting combined stream is transmitted via network 130 to field stations 140.
  • one or more of data streams 185 is stored locally and/or is transmitted over a different communication link, for example over a wireless link.
  • the data stream transmitted over the wireless link includes fewer frames and/or is compressed with a stronger compression ratio than data streams 185 transmitted onto network 130.
  • converter 190 prepares a single video stream 180 having a single set of parameters.
  • encoder 195 optionally applies different compression ratios to the single video stream 180 in generating the plurality of data streams with different quality levels.
  • converter 190 is generally simpler than in other alternatives.
  • surveillance unit 101 transmits the different video streams to different stations 140 according to their needs, for example by putting the data of different video streams in packets of different headers.
  • the packet headers used may state the address of a single station 140, a multicast address of a plurality of stations and/or a broadcast address.
  • one or more stations 140 receive more than one of the data streams.
  • the one or more stations 140 utilize one of the data streams, which they currently require, ignoring the other data streams.
  • one or more of the stations 140 uses two or more data streams, for example one of the streams is stored and the other is displayed.
  • field stations 140 do not notify the transmitter which data stream is being used.
  • Transmitting a plurality of data streams with different quality levels from surveillance unit 101 allows a single field station 140 to use the video stream for different tasks (e.g., display and storage) which require different quality levels, without incurring additional delay for changing the stream format and/or without requiring the processing resources required for changing the format.
  • transmitting a plurality of video streams of different quality levels from surveillance unit 101 allows different field stations 140 to receive the video content from camera 110 with different quality levels, without requiring a complex format conversion router within network 130.
  • transmitting the same plurality of video streams to some or all stations 140 simplifies transmission at surveillance unit 101, since surveillance unit 101 does not need to keep a list and differentiate between different stations.
  • conversion unit 120 is capable of generating video streams of a plurality of different quality levels.
  • the actual quality levels for which video streams are generated by conversion unit 120 is optionally determined based on the needs of field stations 140.
  • each field station 140 periodically transmits an indication of the quality level (or levels) it requires to surveillance unit 101, and accordingly the quality levels for which streams are generated and transmitted, are determined.
  • a user may set the quality levels for which video streams are generated.
  • conversion unit 120 generates a high quality stream and a low quality stream.
  • the low quality stream is continuously generated and transmitted to a storage unit, while the high quality stream is generated only when one or more monitoring units are required to currently display the video images acquired by camera 110.
  • Fig. 3 is a schematic illustration of a surveillance system 400, in accordance with an exemplary embodiment of the invention, hi some embodiments of the invention, network 130 is connected to a plurality of surveillance units 101, each unit including a camera that acquires a video stream of images.
  • system 100 comprises a single field station 140 receiving image streams from surveillance units 101.
  • field station 140 receives a low quality stream from each of surveillance units 101, for storage.
  • field station 140 optionally receives from one or more surveillance units 101, a high quality image stream (having the same image content as the low quality stream of that unit) for computer analysis, for high quality storage and/or for display to a human guard.
  • system 400 may include one hundred surveillance units 101 which continuously provide image data for storage and/or for low quahty display.
  • field station 140 receives from 9, 16 or any other number of surveillance units 101, high quality streams for high quality display to a human guard.
  • the surveillance units 101 providing the high quality streams, in addition to the low quality streams, are optionally units at strategic and/or otherwise important locations.
  • a human guard may select the surveillance units 101 to provide the high quality streams, for example, based on information from viewing the low quality streams, from other surveillance alerts and/or randomly.
  • each surveillance unit 101 transmits the same transmission to all field stations 140.
  • each surveillance unit 101 transmits a transmission to each field station according to the applications needed by the receiving field station.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Closed-Circuit Television Systems (AREA)

Abstract

Procédé de transmission de contenu vidéo en direct à une station sur le terrain. Le procédé consiste à recevoir un flux vidéo brut en temps réel en provenance d'une caméra d'une unité de surveillance, à coder le flux de vidéo brut en flux de vidéo ou de données multiples autonomes avec différents niveaux de qualité, et à fournir les multiples flux de vidéo ou de données autonomes à une ou à plusieurs unités de stockage ou de surveillance.
PCT/IL2003/000092 2003-02-05 2003-02-05 Transmission video parallele WO2004071098A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/IL2003/000092 WO2004071098A1 (fr) 2003-02-05 2003-02-05 Transmission video parallele
AU2003206108A AU2003206108A1 (en) 2003-02-05 2003-02-05 Parallel video transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IL2003/000092 WO2004071098A1 (fr) 2003-02-05 2003-02-05 Transmission video parallele

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2428951A (en) * 2005-07-26 2007-02-07 Harry Llewellyn Live video streaming
CN101883271A (zh) * 2010-06-04 2010-11-10 中兴通讯股份有限公司 无线会议电视系统中控制数据码率的方法及系统
FR3026260A1 (fr) * 2014-09-22 2016-03-25 Airbus Ds Procede de transmission d'images de surveillance video

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Publication number Priority date Publication date Assignee Title
EP0967584A2 (fr) * 1998-04-30 1999-12-29 Texas Instruments Incorporated Système automatique de surveillance vidéo
WO2001082255A1 (fr) * 2000-04-24 2001-11-01 Video Domain Technologies Ltd. Systeme de surveillance equipe d'une camera
US20020044606A1 (en) * 2000-09-29 2002-04-18 Yuuichi Togashi Contents transmission/reproduction system, contents transmission apparatus, contents reproduction apparatus and contents transmission method
US20020063777A1 (en) * 2000-11-30 2002-05-30 Koji Maekawa Image transmission apparatus, image receiving apparatus, image transmitting and receiving system, and image receiving and transmitting method

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Publication number Priority date Publication date Assignee Title
EP0967584A2 (fr) * 1998-04-30 1999-12-29 Texas Instruments Incorporated Système automatique de surveillance vidéo
WO2001082255A1 (fr) * 2000-04-24 2001-11-01 Video Domain Technologies Ltd. Systeme de surveillance equipe d'une camera
US20020044606A1 (en) * 2000-09-29 2002-04-18 Yuuichi Togashi Contents transmission/reproduction system, contents transmission apparatus, contents reproduction apparatus and contents transmission method
US20020063777A1 (en) * 2000-11-30 2002-05-30 Koji Maekawa Image transmission apparatus, image receiving apparatus, image transmitting and receiving system, and image receiving and transmitting method

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Title
MCCANNE S ET AL: "LOW-COMPLEXITY VIDEO CODING FOR RECEIVER-DRIVEN LAYERED MULTICAST", IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, IEEE INC. NEW YORK, US, vol. 15, no. 6, 1 August 1997 (1997-08-01), pages 983 - 1001, XP000694449, ISSN: 0733-8716 *
VIDEO DOMAIN TECHNOLOGIES: "VIDEOWATCH DATA SHEET", VIDEOWATCH DATA SHEET, 11 May 1999 (1999-05-11), XP002256319, Retrieved from the Internet <URL:ftp://ftp.vdomain.com/pub/docs/videowatch/vwspec.pdf> [retrieved on 20031001] *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2428951A (en) * 2005-07-26 2007-02-07 Harry Llewellyn Live video streaming
CN101883271A (zh) * 2010-06-04 2010-11-10 中兴通讯股份有限公司 无线会议电视系统中控制数据码率的方法及系统
CN101883271B (zh) * 2010-06-04 2014-02-05 中兴通讯股份有限公司 无线会议电视系统中控制数据码率的方法及系统
FR3026260A1 (fr) * 2014-09-22 2016-03-25 Airbus Ds Procede de transmission d'images de surveillance video
WO2016046219A1 (fr) * 2014-09-22 2016-03-31 Airbus Ds Sas Procédé de transmission d'images de surveillance vidéo
US10225586B2 (en) 2014-09-22 2019-03-05 Airbus Ds Sas Method for transmitting video surveillance images

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