WO2001086956A1 - Procede et appareil de codage et de transmission d'images provenant d'une pluralite de cameras de surveillance - Google Patents

Procede et appareil de codage et de transmission d'images provenant d'une pluralite de cameras de surveillance Download PDF

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Publication number
WO2001086956A1
WO2001086956A1 PCT/GB2001/002063 GB0102063W WO0186956A1 WO 2001086956 A1 WO2001086956 A1 WO 2001086956A1 GB 0102063 W GB0102063 W GB 0102063W WO 0186956 A1 WO0186956 A1 WO 0186956A1
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WO
WIPO (PCT)
Prior art keywords
image stream
multiplexed
camera
encoded
streams
Prior art date
Application number
PCT/GB2001/002063
Other languages
English (en)
Inventor
Peter Diamond
Original Assignee
Dedicated Micros Limited
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 Dedicated Micros Limited filed Critical Dedicated Micros Limited
Priority to AU2001254964A priority Critical patent/AU2001254964A1/en
Publication of WO2001086956A1 publication Critical patent/WO2001086956A1/fr

Links

Classifications

    • 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
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4347—Demultiplexing of several video streams
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T9/00—Image coding
    • G06T9/004—Predictors, e.g. intraframe, interframe coding
    • 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
    • G08B13/19639—Details of the system layout
    • G08B13/19645—Multiple cameras, each having view on one of a plurality of scenes, e.g. multiple cameras for multi-room surveillance or for tracking an object by view hand-over
    • 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
    • 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
    • G08B13/19678—User interface
    • G08B13/19691—Signalling events for better perception by user, e.g. indicating alarms by making display brighter, adding text, creating a sound
    • G08B13/19693—Signalling events for better perception by user, e.g. indicating alarms by making display brighter, adding text, creating a sound using multiple video sources viewed on a single or compound screen
    • 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
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2365—Multiplexing of several video streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources

Definitions

  • the present invention relates in general to a method and apparatus for the transmission of live images from a plurality of surveillance cameras, and more particularly to a method and apparatus using a predictive coding scheme such as MPEG.
  • LAN local area network
  • PSTN public switched telephone network
  • An aim of the present invention is to address the problems of the prior art discussed above or otherwise.
  • One preferred aim of the present invention is to provide a method and apparatus for the transmission of live images from a plurality of surveillance cameras.
  • Other aims of the invention relate to a method and apparatus for efficiently encoding live images from a plurality of surveillance cameras, and to a method and apparatus for decoding and displaying the encoded images.
  • a method for encoding images from a plurality of surveillance cameras comprising the steps of: (a) providing a camera image stream from each of a plurality of surveillance cameras; (b) multiplexing the camera image streams to provide a multiplexed image stream; and (c) predictive coding the multiplexed image stream to provide an encoded image stream.
  • the camera image stream from each surveillance camera comprises independent still image frames, preferably in a logical sequence such as a temporal sequence.
  • the image stream from each camera is a live sequence of image frames at a predetermined frame rate.
  • the step (a) includes analogue to digital conversion of images produced by an analogue surveillance camera.
  • the step (b) comprises time division multiplexing of the camera image streams.
  • the camera image streams are multiplexed based upon units of a predetermined number of image frames from each camera image stream.
  • each unit comprises of the order of ten or twelve images in sequence from one camera image stream.
  • the multiplexing step (b) includes storing the plurality of camera image streams in a temporary storage, for ease of manipulation and to provide an accurate temporal record.
  • the method includes the step (bl) of compressing at least one and preferably all of the independent still image frames using a non-predictive coding scheme, such as JPEG.
  • the non-predictive coding step is performed immediately before or immediately after the multiplexing step (b) .
  • the predictive coding step (c) takes the multiplexed image stream to form a continuous encoded image stream.
  • the predictive coding scheme forms a group of pictures
  • each GOP comprises the same number of image frames as each unit in the multiplexing step (b) .
  • each unit forms more than one GOP.
  • each GOP is an individual GOP, comprising images from only one camera, taken from a corresponding portion of the multiplexed image stream.
  • the predictive coding step (c) produces an encoded image stream comprising a continuous stream of individual GOPs provided from the multiplexed image stream as if taken from a single source.
  • the method comprises the step of (d) transmitting the encoded image stream over a transmission link.
  • the transmission link is a local area network such as an Ethernet lObaseT or lOObaseT network.
  • the encoded image stream is transmitted to a storage device.
  • the method for decoding comprises the steps of: (e) receiving the encoded image stream; (f) predictive decoding the encoded image stream to reproduce the multiplexed image stream; and (g) demultiplexing the multiplexed image stream to reproduce the plurality of camera image streams.
  • the encoded image stream is decoded using one corresponding decoder such as an MPEG software decoder in order to recreate the multiplexed image stream.
  • one corresponding decoder such as an MPEG software decoder
  • the method comprises the steps of: (e) receiving the encoded image stream; (f ) demultiplexing the encoded image stream to provide a plurality of demultiplexed image streams; and (g' ) predictive decoding each demultiplexed image stream to reproduce the original camera image streams .
  • the demultiplexing step (f) is performed based upon individual GOPs in the encoded image stream.
  • the predictive decoding step (g' ) is performed using a separate software decoder for each demultiplexed encoded image stream.
  • the method comprises the step of (h) selectively displaying at least one of the camera image streams.
  • a continuous sequence of images from each camera image stream is displayed, for example, on a separate display device, or in a separate area of a single display screen.
  • a method for transmitting live images from a plurality of surveillance cameras for display on a display unit comprising the steps of: (a) providing a camera image stream from each of a plurality of surveillance cameras; (b) multiplexing the camera image streams to provide a multiplexed image stream; (c) predictive coding the multiplexed image stream to provide an encoded image stream; (d) transmitting the encoded image stream over a transmission link; (e) receiving the encoded image stream; (f) predictive decoding the encoded image stream to reproduce the multiplexed image stream; (g) demultiplexing the multiplexed image stream to reproduce at least one of the plurality of camera image streams for display on a display unit .
  • a method for transmitting live images from a plurality of surveillance cameras for display on a display unit comprising the steps of: (a) providing a camera image stream from each of a plurality of surveillance cameras; (b) multiplexing the camera image streams to provide a multiplexed image stream; (c) predictive coding the multiplexed image stream to provide an encoded image stream; (d) transmitting the encoded image stream over a transmission link; (e) receiving the encoded image stream; (f ) demultiplexing the encoded image stream to provide a plurality of demultiplexed image streams; and (g' ) predictive decoding at least one of the demultiplexed image streams to reproduce a respective one of the camera image streams for display on a display unit.
  • an encoding apparatus for performing steps (a) , (b) and (c) of the method defined herein.
  • an apparatus for encoding images from a plurality of surveillance cameras comprising: a multiplexing unit for multiplexing a camera image stream from each surveillance camera to produce a multiplexed image stream; and a predictive coding unit for predictive coding the multiplexed image stream to form an encoded image stream.
  • the multiplexing unit performs the multiplexing step (b) of the method discussed above.
  • the predictive coding unit performs the predictive coding step (c) of the method discussed above.
  • a decoding apparatus for performing the steps (e) , (f) and (g) of the method defined herein, or steps (e) , (f) and (g' ) of the method defined herein.
  • an apparatus for decoding comprising: a predictive decoding unit for predictive decoding the encoded image stream to reproduce a multiplexed image stream; and a display processing unit for controlling display of the multiplexed image stream on a display unit.
  • the display processing unit includes a demultiplexing unit for demultiplexing the multiplexed image stream to reproduce the original camera image streams. Further, the display processing unit preferably controls a display unit to display each camera image stream as a separate continuous sequence of live images.
  • an apparatus for decoding comprising: a demultiplexing unit for demultiplexing an encoded image stream to produce a plurality of predictive coded camera image streams; and a plurality of predictive decoding units, each for predictive decoding one of the plurality of predictive coded camera image streams to reproduce a camera image stream for display on a display unit .
  • FIG. 1 is a schematic overview of a surveillance system employing a multiple-camera image transmission method and apparatus of a preferred embodiment of the present invention
  • Figure 2 is a schematic illustration of image streams employed in a preferred embodiment of the invention.
  • Figure 3 is a schematic diagram of a first preferred receiver apparatus
  • Figure 4 is a schematic diagram of a second preferred receiver apparatus .
  • the surveillance system 1 of the preferred embodiment is particularly intended for use in transmitting live images from a plurality of cameras 10 over a transmission link 20 to a remote display apparatus 30.
  • the transmission link 20 may take any suitable form including, for example, an analogue transmission line such as a telephone line, a digital transmission line such as a digital subscriber line of a PSTN, or a dedicated transmission link such as optical cables.
  • the preferred embodiment of the present invention is particularly intended for use with a transmission- link such as a local area network (LAN) or wide area network (WAN) using transmission equipment following, for example, Ethernet lObaseT or lOObaseT standards.
  • LAN local area network
  • WAN wide area network
  • Such a transmission link may well be employed for a variety of uses other than the surveillance system, and the total available bandwidth must be shared accordingly. Hence, it is desired to minimise bandwidth associated with the transmission of images from the plurality of cameras 10.
  • the cameras 10 are positioned at suitable locations around an industrial plant such as a chemical processing facility and the images relayed to a display area for monitoring by users supervising operations of the plant.
  • an industrial plant such as a chemical processing facility
  • live images are displayed with a delay over the transmission link being of the order of only a fraction of a second.
  • each camera 10 produces a temporal sequence of still images such as twenty five frames per second and each frame may contain, for example, 20Kb of image data. That is, each camera 10 typically produces an image stream containing around 0.5Mb of data per second.
  • the surveillance system of the preferred embodiment of the invention employs between eight and sixty-four cameras, giving a full data rate of up to 32Mb per second. Therefore, the data rates required to simultaneously transmit live image streams from each of a plurality of cameras exceeds the bandwidth capability of most commonly available transmission links and/or has a significant impact on other traffic that may need to use the same transmission link. Hence, it is desired to transmit live image streams from a plurality of cameras in a manner which is both timely and bandwidth efficient. Referring to Figure 1, each of a plurality of cameras 10 produces a sequence of still images at a desired frame rate in a continuous camera image stream 13.
  • the 14 multiplexes the camera image streams 13 to produce a multiplexed image stream 15.
  • the multiplexed image stream
  • a predictive coding unit 24 which performs predictive coding using, for example, MPEG2 , to produce an encoded image stream 25 for transmission over the transmission link 20.
  • each of the cameras 10 is conveniently an analogue image capture device producing a live image stream 11.
  • Each camera is coupled to a video decoder 12 for producing a sequence of still images at the desired frame rate in a continuous camera image stream 13, including appropriate analogue to digital conversion.
  • the multiplexer 14 performs time division multiplexing based upon units of frames from each camera image stream
  • Each unit comprises a predetermined plurality of still image frames. In one preferred embodiment, each unit comprises of the order of ten or twelve frames .
  • a non-predictive coding unit 16 optionally performs non-predictive coding of each frame in the camera image streams, or preferably in the multiplexed image stream 15 as illustrated, using any suitable non-predictive coding scheme such as JPEG or MJPEG.
  • the non-predictive coding unit 16 reduces the data required to represent each still image frame within the relevant image stream, but operates on each frame individually without any reference to the content of neighbouring frames .
  • a controller 22 supplies the multiplexed image stream 15 to the predictive coding unit 24, such that the predictive coding unit 24 operates on a single stream of input data as if received from a single source.
  • the camera image streams and/or the multiplexed image stream 15 are written to a storage 18, suitably fast disk storage depending upon the capacity required.
  • This stored data is marked with temporal information to provide an accurate record of the images produced from the cameras.
  • the stored data is then ready for use in later reproduction, such as for security and analysis purposes, where the problems associated with live transmission are not encountered.
  • the predictive coding unit 24 performs predictive coding using any suitable predictive coding scheme.
  • MPEG2 is employed.
  • the predictive coding unit 24 produces an encoded image stream 25 comprising groups of pictures (GOPs) each produced from a plurality of still image frames.
  • each frame is encoded with reference to the content of neighbouring frames.
  • the predictive coding unit 24 forms each GOP corresponding to one unit of image frames in the multiplexed image stream 15.
  • the preferred predictive coding scheme is efficient within each GOP itself because the images in each GOP are taken from the same camera image stream and therefore in most cases have a high degree of redundancy between frames .
  • each GOP is marked as an individual GOP to indicate that each GOP has a different image context .
  • a set of GOPs is used to represent one unit of image frames, all taken from the same camera.
  • at least the first GOP in each set is identified as an individual GOP to show the change of context between camera image streams .
  • FIG. 2 illustrates example camera image streams 13, a multiplexed image stream 15 and an encoded image stream 25.
  • the camera image streams 13 each contain a plurality of still image frames, taken in a sequence by one camera.
  • the frames from the first camera are referenced "1", the second camera "2", and so on up to the last camera "n” .
  • the multiplexed image stream 15 contains units of frames from each camera, and in this simple illustrated example each unit contains four frames .
  • the camera image streams are multiplexed by taking at least one unit of frames from each camera in sequence.
  • any suitable multiplexing scheme may be employed.
  • Figure 2 contains one GOP corresponding to each unit, again in a repetitive sequence.
  • the encoded image stream is ready for transmission over the transmission link 20 using any suitable protocol. This may include forming sections of the encoded image stream 25 into data packets as appropriate for transmission over the transmission link 20 to the display apparatus 30.
  • the first preferred embodiment of the display apparatus 30 comprises a predictive decoding unit 32, a demultiplexer 34, and a display processing unit 36.
  • the predictive decoding unit 32 receives the encoded image stream 25 and performs predictive decoding to reproduce the original multiplexed image stream 15.
  • the demultiplexer 34 demultiplexes the multiplexed image stream 15 to reproduce the original plurality of camera image streams 13.
  • Each camera image stream 13 is ready for display on a display device 38 under control of the display processing unit 36, as will be familiar to the skilled person. Conveniently, one or more selected camera streams is displayed in a separate screen area of the display device 38. Alternatively, the decoded multiplexed image stream 15 may be displayed directly, in which case the user will see a short sequence of images from each camera .
  • a second preferred embodiment of the display apparatus 30 comprises a demultiplexing unit 34', a plurality of predictive decoding units 32' and a display processing unit 36.
  • the demultiplexing unit 34' demultiplexes the encoded image stream 25 to produce a plurality of encoded camera image streams.
  • Each predictive decoding unit 32' performs predictive decoding in order to reproduce one of the original camera image streams 13 ready for display on a display device 38.
  • the display processing unit 36 includes a video encoder for performing digital to analogue conversion of the camera image stream 13 ready for display on an analogue display device 38 such as a monitor.
  • the first preferred embodiment of the display apparatus requires only one predictive decoding unit, but is relatively memory intensive during this processing operation and subsequent demultiplexing of the camera streams.
  • the second preferred embodiment of the display apparatus uses less memory, but requires slightly greater processing capacity in order to perform simultaneous predictive decoding of the plurality of camera image streams 13.
  • the skilled person will select the desired display apparatus according to the needs of a particular application. In both cases, the display apparatus is relatively simple using readily available components and requires minimal adaptation in order to successfully display the plurality of camera image streams.
  • the preferred embodiments of the present invention are particularly suitable for use in adapting existing display equipment to receive images transmitted over a transmission link.
  • a method and apparatus have been described for the transmission of images from a plurality of surveillance cameras.
  • the method and apparatus are particularly suited to the transmission of live images over a transmission link that has a limited bandwidth.
  • the method and apparatus make efficient use of a predictive coding scheme in order to minimise bandwidth requirements, whilst maintaining a timely transmission of data.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Databases & Information Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Closed-Circuit Television Systems (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

Des images en direct provenant d'une pluralité de caméras de surveillance (10) sont codées pour être transmises sur une liaison (20) de communication à un appareil (30) d'affichage distant, la liaison (20) de transmission ayant une largeur de bande limitée. Les flux d'images des caméras sont multiplexés dans un multiplexeur pour produire un flux d'images multiplexé puis un codage prédictif est réalisé dans une unité (24) de codage prédictif pour produire un unique flux d'images codé tel que celui de la norme MPEG2. Théoriquement, chaque groupe d'images présent dans le flux (25) d'images codé prélève des images provenant d'une des caméras (10). Le flux (25) d'images codé réduit les besoins en largeur de bande de plusieurs flux d'images en direct.
PCT/GB2001/002063 2000-05-12 2001-05-10 Procede et appareil de codage et de transmission d'images provenant d'une pluralite de cameras de surveillance WO2001086956A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001254964A AU2001254964A1 (en) 2000-05-12 2001-05-10 Method and apparatus for encoding and transmission of images from multiple surveillance cameras

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0011374A GB2362284A (en) 2000-05-12 2000-05-12 Multiplexing and encoding images from muliple surveillance cameras
GB0011374.6 2000-05-12

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GB (1) GB2362284A (fr)
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EP1581002A1 (fr) * 2004-03-25 2005-09-28 Videte IT AG Méthode et dispositif de traitement de signaux vidéo
WO2006061581A1 (fr) * 2004-12-07 2006-06-15 Newnham Research Limited Multiplexage d'ecrans
CN109982008A (zh) * 2017-12-28 2019-07-05 浙江宇视科技有限公司 轮巡切换方法、装置及电子设备

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GB2377332A (en) * 2001-07-04 2003-01-08 Hewlett Packard Co Simulating a moving image from static cameras along a route
EP1333677A1 (fr) * 2002-01-31 2003-08-06 BRITISH TELECOMMUNICATIONS public limited company Vidéo-codage
DE102008049921A1 (de) 2008-09-29 2010-04-15 Mobotix Ag Verfahren zur Videodatenstrom-Erzeugung
US8953038B2 (en) 2009-08-31 2015-02-10 International Business Machines Corporation Distributed video surveillance storage cost reduction using statistical multiplexing principle
US11546612B2 (en) 2021-06-02 2023-01-03 Western Digital Technologies, Inc. Data storage device and method for application-defined data retrieval in surveillance systems

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EP1581002A1 (fr) * 2004-03-25 2005-09-28 Videte IT AG Méthode et dispositif de traitement de signaux vidéo
WO2006061581A1 (fr) * 2004-12-07 2006-06-15 Newnham Research Limited Multiplexage d'ecrans
JP2008523654A (ja) * 2004-12-07 2008-07-03 ニューナム リサーチ リミテッド 画面多重化
JP4846729B2 (ja) * 2004-12-07 2011-12-28 ディスプレイリンク （ユーケー） リミテッド 画面多重化
CN109982008A (zh) * 2017-12-28 2019-07-05 浙江宇视科技有限公司 轮巡切换方法、装置及电子设备

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GB0011374D0 (en) 2000-06-28
GB2362284A (en) 2001-11-14

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