CN102724474A - Portable video conference terminal adopting adaptive network coding method and implementation method - Google Patents
Portable video conference terminal adopting adaptive network coding method and implementation method Download PDFInfo
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Abstract
The invention provides a portable video conference terminal adopting an adaptive network coding method and an implementation method. According to the terminal, an audio and video acquisition module, an audio and video digital processing module, a power module and the like are integrated into a portable terminal box. The terminal is connected with a personal computing device through a USB, a client software of the video conference terminal is run automatically on the personal computing device, and a multi-party video conference can be joined as long as the personal computing device can be connected to the internet. According to the terminal, by perceiving the current communication network state, a coding controller adaptively selects a coding method and dynamically adjusts the video coding strategy according to the real-time network status to enable users at a receiving side to get the best possible real-time video image in the current network state. The terminal operates automatically and is plug-and-play after being connected with the personal computing device, because the underlying driver and the client software of the terminal both reside in the terminal. The terminal has advantages of good portability, simple operation, flexible construction, and good reliability. A low-power consumption design is adopted to realize a long standby time, so that a users can use the terminal whenever and wherever possible.
Description
Technical field
The present invention relates to a kind of video conference terminal and implementation method, the Portable video session terminal and implementation method of more particularly to a kind of adaptive network coding.
Background technology
At present, video conferencing system is broadly divided into two kinds of Software Video Conference System and hardware video meeting.Although not high using pure software solution conference software itself expense based on PC, each meeting room will also match somebody with somebody special PC, single video and audio collecting device（Such as USB cameras, headset）And the relevant rudimentary software such as operating system, along with the expense in terms of installing, safeguarding, integrate, its cost is higher.And pure hardware solution can not only realize the effect of meeting of high-quality, and it is functional to complete institute by the integrated terminal equipment of high integration, without separately matching somebody with somebody other hardware and software facilities, plug and play, use simple, Maintenance free, therefore its integrated cost is cheaper than pure software on the contrary, but it is due to that its deployed position is fixed, it is necessary to which personnel participating in the meeting reaches that the place specified could participate in video conference.
With the development of information technology and increasingly facilitating for mode of transportation, people are this to have to fixed-site and participate in the work that the pattern of video conference gives people to bring many inconvenience often in mobile office state, significantly impact operating efficiency.In addition the trend that video conferencing system technology develops attention at present is the fast development of personal communication instrument, miniaturization, summary and the portability of terminal are constantly pursued, to adapt to the demand for carrying out information communication whenever and wherever possible of SME users and civil servant often in mobile status.
Realize that mobile video session has problems with using personal computing devices：First, network downstream speed is relatively large, and personal computing devices have enough soft decoding capabilities when receiving Downstream video stream, and network uplink speed is relatively small, and the upload of video flowing is to influence the bottleneck of Video Frequency Conference Quality；2nd, personal computing devices are complicated using network environment, the characteristics of there is limited channel width and unstable bandwidth；3rd, personal computing devices generally carry video capture device, but its video coding by the way of being Software Coding, can not meet the requirement of video conference real-time coding；4th, video compress a to cbr (constant bit rate) with fixed frame per second, resolution ratio and video quality, only when the bandwidth of transmission network is sufficiently high, normally could be decoded and shown in receiving terminal by the encoder of conventional video coding standard.
The content of the invention
The deficiency of video conference is realized for above-mentioned existing video conferencing system construction and personal computing devices, meet the demand for adding video conference anywhere or anytime, it is an object of the invention to provide a kind of Portable video session terminal implementation method of adaptive network coding, the terminal is by input module, audiovisual digital processing module, power module etc. is integrated in a portable termination box, it is connected by personal computing devices such as USB connected modes and PCs, video conference terminal client software automatic running on a personal computing device, as long as personal computing devices can join online（Wired network, 3G network, WiFi wireless networks）Multipart video-meeting can just be realized.Offer " time-space-quality " three-dimensional telescopic encoding scheme of a lower complexity is provided in embedded DSP, exported according to the code stream that service quality QoS perceives network state information control audiovisual digital processing modules implement adaptive network state.
To achieve the above object, the present invention takes following technical scheme：
A kind of Portable video session terminal implementation method of adaptive network coding, including following key step：
Step 1: collection local video signal and audio signal；
Step 2: the local audio signal collected and vision signal are compressed into coding, the network state perceived according to terminal software, coding controller, come the corresponding coded system of Tactic selection, realizes adaptive hardware fast coding according to corresponding network state；
Step 3: terminal is connected by USB interface with personal computing devices, video conference center is transferred data to by the network communicating function of personal computing devices, conference centre is by data distribution to meeting-place other-end video and audio device plays, the video data of the other-end of conference centre's forwarding is also received simultaneously, so as to be communicated between realizing multipart video-meeting.
It is preferred that, above-mentioned Portable video session terminal includes acquisition module, audiovisual digital processing module, external communication device interface module, power module and terminal software module.
It is preferred that, above-mentioned acquisition module includes camera and microphone, the local audio video input signals for receiving；
Above-mentioned audiovisual digital processing module includes coding controller, can be according to the corresponding coded system of condition selecting of network；Audiovisual digital processor, realizes that the vision signal to input is compressed coding using MCTF, DWT and SHIFT algorithm based on small echo；
Said external communication device interface module is usb interface module, is connected in the form of USB interface with personal computing devices, and data are transmitted to meeting-place using the Internet communication capacity of personal computing devices；
Above-mentioned power module is the power-supply system of low-power consumption, including rechargeable battery, power supply adaptor, and there is provided two kinds of power supply modes for USB interface charging module：Directly powered by power supply adaptor external power supply to terminal；Charged, powered by battery to terminal to battery by the external personal computing devices of USB interface；
Above-mentioned terminal software module resides in client software and driver in video conference terminal, the automatic running when being connected to personal computing devices by USB interface, without installing, plug and play.
It is preferred that, above-mentioned personal computing devices refer to the equipment with display, online and certain computing capability, such as desktop computer, notebook computer, net book.
It is preferred that, above-mentioned acquisition module, audiovisual digital processing module, external communication device interface module and power supply module are fixed on same bottom plate, it is integrated in the machine box of card form, above-mentioned Portable video session terminal also includes cooling system, and cooling system is made up of one block of heat sink and a dissipation hot hole.
The present invention is due to taking above technical scheme, and it has advantages below：
1st, terminal carries out scalable coding by sensing network channel conditions, the network environment that adaptive a variety of personal computing devices are accessed, video coding strategies can dynamically be adjusted according to real-time network condition, receiving side user is obtained real time video image quality as well as possible under current network state.
2nd, compared to the mode for carrying out carrying out audio-video signal Software Coding on a personal computing device, the audio/video coding hardware module realized in terminal by high performance embedded digital signal processing system realizes the coding of higher efficiency.
3rd, input module, power module, audiovisual digital processing module, transport module, power module are integrated in inside a carrying case by the video conference terminal, easy to carry.In addition, the terminal bottom layer driving and client software are installed in video conference terminal, after being connected with personal computing devices can automatic running, without installing, plug and play is simple to operate.
4th, in terms of transmission means, the terminal can be connected by usb mode with any personal computing devices, then the network accessed by personal computing devices, realize data exchange and data transfer, build flexible, reliability high.The realization of video conference is no longer limited to the equipment of fixed venue.
Brief description of the drawings
Fig. 1 is video conferencing system modules connection figure.
Fig. 2 is Portable video session terminal structured flowchart of the present invention.
Fig. 3 is the structured flowchart of audiovisual digital processing module.
Fig. 4 is coding strategy coordinate schematic diagram.
Fig. 5 is network quality state classification schematic diagram.
Embodiment
For the ease of those of ordinary skill in the art understand and implement the present invention, below in conjunction with the accompanying drawings and embodiment the present invention is described in further detail.
Fig. 1 is the video conferencing system solution of complete set, by server（Including the network management software（Gatekeeper and gateway））, multipoint control unit（MCU）, the Portable video session terminal, personal computing devices and the transmission network that design of the present invention and related accessories constitute.Each several part realizes video conference by the orderly connection in internet.
As shown in Fig. 2 the present invention includes audio-video collection module, audiovisual digital processing module, usb interface module, cooling system, power module and client terminals software module.
Audio-video collection module receives the input of local audio-video signal.It mainly includes microphone and camera.Microphone receives local audio signal input, and camera receives the input of local video signal.
Audiovisual digital processing module, the module is connected to audio-video collection module and usb interface module.It receives local audio-video signal from audio-video collection module, and Signal Compression is turned into the locally compressed coding for meeting international standard, and locally compressed coding is transferred into personal computing devices by usb interface module（Such as notebook computer, smart mobile phone etc.）, the communication network then connected again by personal computing devices, to outside transmission encoded signal, in addition, personal computing devices receive the remote audio-video data in other meeting-place by institute's connection communication network, are decoded using video conference client software, reduce remote audio-video signal.
Power module includes rechargeable battery, power supply adaptor, and there is provided two kinds of power supply modes for USB interface charging module：Directly powered by power supply adaptor external power supply to video conference terminal；Charged, powered by battery to video conference terminal to battery by the external communication equipment of USB interface.By switching selection powering mode shown in Fig. 2.
Client terminals software module mainly has following three kinds of functions：Shirtsleeve operation is carried out to meeting platform（Including applying for and refusing meeting and other operations）；Played out to the audio-video signal locally gathered and from network audio-video signal；Receive QOS information and audio-video signal from conference centre；The client terminals software can be run under multiple operating systems.
From figure 3, it can be seen that client terminals are received from monitoring information of the video conference center QoS service to network state first in signals transmission, network state information is fed back into coding controller.
Fig. 3 gives the operation principle of audiovisual digital processing module.Its core concept is the network state information for being fed back to come according to the QOS monitors at video conference center, to determine that the image that terminal collection comes is transmitted using which kind of strategy and speed, the module uses a kind of layered video coding scheme of " time-space-quality " of rate adaptation.Program principle is as follows：In coding controller, quantitative analysis is carried out by the network state of the feedback by QOS is received, present encoding strategy is obtained, using multilayer MCTF（Based on motion compensated temporal filter algorithm）Technology realizes the time（Frame rate）Scalability, using DWT（Algorithms of Discrete Wavelet Transform）Technology realizes spatial scalability, using SPIHT（SPIHT algorithm）Technology realizes the scalability of quality, carries out re-organized to the layered data flows after MCTF, DWT and spiht algorithm processing, obtained data flow and index file be sent to the decoder reconstruction image of receiving terminal.Algorithm above is realized on Embedded DSP System.
So-called determination coding strategy, exactly after the network state information to feeding back to coding controller carries out quantitative analysis, selects a coordinate points in the three-dimensional coordinate system shown in Fig. 4（X, y, z）, corresponding value correspond to respectively be time, space and quality scalability coding control parameter, such as value (2,3,2), its correspondence is meant that MCTF does 2 layers of conversion, does 3 grades of DWT decomposition, the progress quadratic closeness quantization in spiht algorithm is realized.It is described in detail below：Converted in the video sequence to input using 2 layers of MCTF, form two layers of high pass frames and low pass frame sequence, frame number is reduced by giving up high pass frames, realize that frame rate is reduced to original 1/4, retained the low pass frames after second layer MCTF conversion and carry out next step operation；Wavelet transform DWT is that the frame that previous step retains is carried out, and obtains 10 subbands per two field picture after 3 grades of wavelet transformations, gives up all high-frequency sub-bands, only retains low frequency sub-band LL3 and does next step processing, it is original 1/8 to obtain spatial resolution；Finally determine which layer data is sent to decoding end by spiht algorithm, the maximum wavelet coefficient of previous step retention frame is carried out after initial quantization, it is encoded to obtain the 1st layer bit stream, the first reconstructed image is corresponded to during decoding, quality is the most coarse, and coding under second quantization is carried out to remaining coefficient and forms the 2nd layer bit stream, decoding quality is better than the first reconstructed image, coding only exports the 1st, 2 layer bit streams, no longer carries out new quantization.It can be seen that, x, it is different to represent the video data stream for being sent to receiving terminal decoder in time, space and the aspect information content of quality three under y and z different valued combinations, and the parameter in terms of these three can independent control；X and y value is bigger, and z value is smaller, and corresponding video compress is than bigger.In the present invention, x, y and z span, i.e. 1≤x≤4,1≤y≤4,1≤z≤8 are provided.
Quantitative analysis method is carried out to network state described below.QOS packet loss is to influence the key index of Video Frequency Conference Quality, and the highest network packet loss rate that can be tolerated in video conference at present is 20%, and network quality state demarcation is three kinds of states according to packet loss size n by we：Optimum state, worst state and adjustment state, as shown in Figure 5.
Optimum state：As network packet loss rate n<Think that network quality state is in optimum state when 5%, higher coding strategy can be selected under slightly below current network upstream bandwidth speed, high-quality video image is obtained after decoder reconstruction, if measuring current a width of 700kbps of uplink network band or so, the spatial resolution of incoming video signal is 640*480, when video frame rate is 60fps, it may be determined that coding strategy point is（1,1,8）, coding strategy with the time without adjusting during in such a state.
Worst state：As network packet loss rate n>Think that network quality state is in worst state when 20%, video sequence is carried out after MCTF processing in obtained layer set, the layer for choosing lowest level does corresponding DWT processing, finally carry out quality coded, the image for reconstructing the quality, frame rate and spatial resolution of lowest level meets transmission demand, it is ensured that remain able to carry out video conference under this network state, coding strategy now should choose x and y maximum and z minimum value, such as take x=4, y=4 and z=1.Coding strategy with the time without adjusting during in such a state.
Adjustment state：When 5%<n<When 20%, coding strategy is adjusted with network quality state change, when n is close to 5%, and (1,1,8) that the coding strategy (x, y, z) of selection is calculated under optimum state, reconstructed image quality now is better；When n is close to 20%, the coding strategy (x, y, z) of selection is closer to (4,4,1), and reconstructed image quality now is poorer.Method of adjustment is described as follows：One regular coding strategy of correspondence in 4 state subintervals, i.e. 5%-8%, 8%-12%, 12%-17% and 17%-20%, each subinterval is divided into by n value size, so there are 5 state adjustment critical point, i.e. n=5%, 8%, 12%, 17% and 20%.In view of a less fluctuation occurs in network transmission, it is impossible to carry out the adjustment of coding strategy according only to the situation of change of a packet loss.Values of the record n in certain time period is continuously measured in the present invention by timer, i.e., statistics calculating is carried out with the record value at K-1, K-2, K-3, K-4 moment to the record value at K moment, by formula
Calculate the average packet loss ratio of this time
, then by formula
Mean square deviation is obtained, bySize judge the situation of change of a period of time network state, if
<2%, it is believed that belong to Slight undulations, previous coding strategy is kept, without carrying out Developing Tactics；If sometime packet loss n value for adjustment critical point value and
>=2%, then coding strategy is adjusted correspondingly.
It is described above, only it is the specific implementation case for illustrating the present invention, be not limited to the present invention can practical range, such as those skilled in the art should be covered without departing from the spirit indicated by the present invention and all equivalent changes or modification for being completed under principle by the scope of the claims in the present invention.
Claims (5)
1. the Portable video session terminal implementation method of a kind of adaptive network coding, it is characterised in that including following key step：
Step 1: collection local video signal and audio signal；
Step 2: the local audio signal collected and vision signal are compressed into coding, the network state perceived according to terminal software, coding controller, come the corresponding coded system of Tactic selection, realizes adaptive hardware fast coding according to corresponding network state.
Step 3: terminal is connected by USB interface with personal computing devices, video conference center is transferred data to by the network communicating function of personal computing devices, conference centre is by data distribution to meeting-place other-end video and audio device plays, the video data of the other-end of conference centre's forwarding is also received simultaneously, so as to be communicated between realizing multipart video-meeting.
2. the Portable video session terminal implementation method of adaptive network coding as claimed in claim 1, it is characterised in that：The Portable video session terminal includes acquisition module, audiovisual digital processing module, external communication device interface module, power module and terminal software module；
The acquisition module includes camera and microphone, the local audio video input signals for receiving；
The audiovisual digital processing module includes coding controller, and the coded system of network transmission state is adapted to according to the state Tactic selection of network；Audiovisual digital processor, realizes that the vision signal to input is compressed coding using based on small echo MCTF, DWT and spiht algorithm；
The external communication device interface module is usb interface module, is connected in the form of USB interface with personal computing devices, and data are transmitted to meeting-place using the Internet communication capacity of personal computing devices；
The power module is the power-supply system of low-power consumption, including rechargeable battery, power supply adaptor, and there is provided two kinds of power supply modes for USB interface charging module：Directly powered by power supply adaptor external power supply to terminal；Charged, powered by battery to terminal to battery by the external personal computing devices of USB interface；
The terminal software module resides in client software and driver on video conference terminal, the automatic running when being connected to by USB interface on personal computing devices, without installing, plug and play.
3. the Portable video session terminal implementation method of adaptive network coding as claimed in claim 1 or 2, it is characterised in that：The personal computing devices refer to the equipment with display, online and certain computing capability.
4. the audiovisual digital processing module in the Portable video session terminal of adaptive network coding as claimed in claim 3, it is characterised in that：The personal computing devices are desktop computer, notebook computer, tablet personal computer, net book or smart mobile phone.
5. the audiovisual digital processing module in the Portable video session terminal of adaptive network coding as claimed in claim 2, it is characterized in that, the network state information come can be fed back according to the QoS monitors at video conference center, determine that the image that terminal collection comes is transmitted with which kind of form and which kind of frame per second, the module uses a kind of " time-space-quality " of adaptive network situation three-dimensional scalable video scheme.
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| CN103916622A (en) * | 2013-01-06 | 2014-07-09 | 联想(北京)有限公司 | Talking mode switching method and device |
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| CN105100663A (en) * | 2014-05-15 | 2015-11-25 | 北京同步科技有限公司 | Recording system based on hardware encoders, audio and video processing apparatus, and recording method |
| CN105635628A (en) * | 2016-01-22 | 2016-06-01 | 深圳市华玺科技有限公司 | Backpack type individual access video conference method and system |
| CN106031164A (en) * | 2014-02-26 | 2016-10-12 | 株式会社理光 | Communication device, communication system, communication control method, and program |
| CN106331577A (en) * | 2015-06-25 | 2017-01-11 | 阿里巴巴集团控股有限公司 | Coding adjustment method and coding adjustment device |
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| CN109600610A (en) * | 2018-11-12 | 2019-04-09 | 深圳市景阳科技股份有限公司 | A kind of data-encoding scheme and terminal |
| CN109964488A (en) * | 2016-11-15 | 2019-07-02 | 谷歌有限责任公司 | The quality and user experience of the live video stream transmission from mobile device are improved using converging network statistics |
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| CN105100663A (en) * | 2014-05-15 | 2015-11-25 | 北京同步科技有限公司 | Recording system based on hardware encoders, audio and video processing apparatus, and recording method |
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| WO2017070998A1 (en) * | 2015-10-27 | 2017-05-04 | 邦彦技术股份有限公司 | Portable desktop audio and video conference device and system |
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| WO2019178716A1 (en) * | 2018-03-19 | 2019-09-26 | Qualcomm Incorporated | Adaptive video bitrate for power saving |
| US11205397B2 (en) | 2018-03-19 | 2021-12-21 | Guangzhou Shiyuan Electronics Co., Ltd. | Data transmission device and data transmission method |
| CN108881188A (en) * | 2018-05-31 | 2018-11-23 | 北京橙鑫数据科技有限公司 | The sending, receiving method and its device and playback equipment of multi-medium data |
| CN109600610A (en) * | 2018-11-12 | 2019-04-09 | 深圳市景阳科技股份有限公司 | A kind of data-encoding scheme and terminal |
| CN109600610B (en) * | 2018-11-12 | 2020-10-23 | 深圳市景阳科技股份有限公司 | Data encoding method, terminal and computer readable storage medium |
| CN111641801A (en) * | 2020-05-28 | 2020-09-08 | 中山大学附属第一医院 | Portable video conference emergency device |
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