CN101198035A - Video monitoring method, video transferring and distribution method and device and video monitoring system - Google Patents
Video monitoring method, video transferring and distribution method and device and video monitoring system Download PDFInfo
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Abstract
The invention discloses a video transfer and distribution method in video monitoring, wherein, corresponding video layers of video images which are transmitted from PU equipment and delaminated and encoded are sent to CU according to receiving ability of CU by utilization of the fact that VTDU of different video layers can be distinguished. The invention also discloses a video monitoring method, a video transfer and distribution device and a video monitoring system. The video monitoring method of the invention has no high demand on equipment characteristics and simultaneously also can well meet requirements of different bandwidth users.
Description
Technical field
The present invention relates to a kind of video monitoring technology, especially with video monitoring that a kind of wide and narrow strip video monitoring system based on layered video coding realizes in video transferring and distribution method, video frequency monitoring method, video shift dispensing device and video monitoring system relevant.
Background technology
The Network Video Surveillance business is based on IP network and provides remote collection, transmission, the storage of image, alarm signal and other relevant informations, a kind of telecommunication service of processing for the user.This operation system comprises front monitoring front-end (Peripheral Unit, abbreviation PU), by center management server (Central ManagementServer, abbreviation CMS), video shifts Dispatching Unit (Video Transmit and Distribute Unit, abbreviation VTDU), network video recording unit (Network Record Unit, be called for short NRU) wait monitor supervision platform and user terminal (Client Unit, abbreviation CU) three parts formed.Front monitoring front-end is placed in the monitored site, information such as images acquired, warning; These information are sent to monitor supervision platform by network, by monitor supervision platform the image that sends are transmitted, is distributed or stores, to the warning processing that links; Professional user (end user) can watch video by user terminal at any one access point of network, front monitoring front-end is controlled, and can be received warning message.By video monitoring service, the user can watch monitoring image clear, true to nature as on the spot in person long-range, relies on operation system to scout the condition of a disaster automatically, and receives various warning messages in time.By with the cooperating and interlock of other related service systems, video monitoring can be played a great role in more wide field.
Along with video monitoring and network technical development, the IP supervisory control system more and more has advantage, and video monitoring all-IPization and even all monitoring all-IPizations are trends of the times, and promptly the equipment of all participation supervisory control systems all has the IP address of oneself.Point out that according to relevant analysis report because society is to the factors such as reduction of growing interest, development of technology and the price of public safety, the market of IP video monitoring system will have than leap ahead in the coming years.
For small-sized monitor network, special-purpose monitor network etc. can consider to adopt the scheme of full multicast, and head end encoder sends live video stream in IP multicast mode, and user terminal adds respective sets with IGMP and gets final product.The IP backbone bandwidth of being occupied all is one road video stream bandwidth, can reduce unnecessary overlapping transmission, compare with point-to-point clean culture (Unicast) repeatedly, alleviated the burden of system and network, improve cpu resource and utilization of network bandwidth, greatly improved the real-time of video Data Transmission.
In metropolitan area network is used, in supervisory control system, introduce video usually and shift Dispatching Unit (being VTDU), be responsible for the forwarding of real-time video-voice frequency flow.This is the equal of to increase the new network architecture (being content distributing network) of one deck in existing Internet, monitoring content is published to network " edge " near the user, make the user can obtain required content nearby, solve Internet network congestion situation, improve user capture and response speed.
As shown in Figure 1, adopt H3C iVS (intelligent Video Surveillance, can only video monitoring) the IP supervisory control system VTDU dynamic load share of command of above-mentioned framework and concatenated schemes automatically, its workflow comprises carries out following steps successively:
Step S10:CU1 sends real-time video request to PU1 passage 1 to CMS; Here, can descend to hang one or more camera under each PU equipment, PU manages down the camera of hanging with the camera passage, and each camera passage can produce one road real-time audio and video stream.
Step S20:CMS scheduling VTDU1 carries the real-time video forwarding of this request.
Carry out the request and the response of real-time video between step S30:PU1 and the CMS.
Step S40:CMS sends replying of real-time video request to CU1, and CU1 carries out the acceptance preparation.
Step S50:PU1 sends stream in real time to appointed VTDU1;
Step S60:VTDU1 gives CU1 with real-time stream distribution.
In the prior art, most IP supervisory control system is based on broadband network, and the client can watch monitoring image clearly by broadband access.In today of information technology develop rapidly, user's demand improves constantly, and the monitoring market segments are the monitoring of public security specialty, industry monitoring, family's monitoring, public's monitoring etc.Owing to condition restriction, the client can only use narrow band access modes such as mobile phone, dialing to monitor in real time under a lot of situations.How to satisfy this part client's demand, particularly when different clients monitors same front end, how according to their bandwidth or the difference of other reception parameters, satisfy different separately reception demands, these all have pending further research.
Continuous growth along with customer demand, different clients adopts different access waies, the broadband is arranged, the arrowband is arranged, in order to satisfy their different needs, general way is to increase the mode that a media gateway (GateWay) equipment adopts code conversion (Transcoding), and each client is done encoding and decoding respectively.The i.e. video image decoding that earlier PU equipment is transmitted, and then recompile is the video image that satisfies user's needs, sends to the user.The cost height of this method, efficient are low, and it is very big influenced by the GW equipment performance.
Another method is exactly, and for different video request, adopts different coding methods at the front end coding, satisfies different clients' demand.The head end encoder general performance is more weak, can only satisfy minority client's different coding demand; Simultaneously, network bandwidth consumption is increased greatly.
Layered video coding is a kind of technology that allows video information to send with a plurality of data flow, to reach scalability.Advise, H.264 all described similar hierarchical coding ability in the suggestion at H.263 suggestion, MPEG4, three kinds of flexible types are arranged: time, signal to noise ratio (snr) and space.By using these methods, can produce the multilayer scalable bitstream.Resolution, frame rate and picture quality can only strengthen by increasing stretchable layer.Basic layer is used for guaranteeing the picture quality of minimal level.Subsequently, client can be used other layer, improves picture quality by increase frame rate, display frame size, decoded picture precision.By in video conference, monitor network, utilizing the advantage of hierarchical coding, adopt a bit stream to come to effectively utilize the network bandwidth more like this for having the end points service of different abilities.Wherein the simplest is to reduce bandwidth occupancy by the mode that changes frame frequency, is periodically to extract some Frame from continuous video sequence such as " taking out frame ", and visual effect is similar to robot, also belongs to the category of retractility decoding.
Summary of the invention
At problems of the prior art, the object of the present invention is to provide and a kind ofly can satisfy the different customer demand of ability to accept, equipment performance is required low, effectively utilize the video transferring and distribution method in the video monitoring of the network bandwidth.
Second purpose of the present invention is to provide a kind of video frequency monitoring method that uses video transferring and distribution method of the present invention.
The 3rd purpose of the present invention is to provide a kind of video of the video transferring and distribution method in the video monitoring of the present invention of realizing to shift dispensing device.
The 4th purpose of the present invention is to provide a kind of video monitoring system that video of the present invention shifts dispensing device that has.
For achieving the above object, technical scheme of the present invention is as follows:
Video transferring and distribution method in a kind of video monitoring comprises the steps:
Step S110:VTDU carrying CU transmits the video of PU visit;
Step S120: described VTDU receives the multi-medium data that described PU equipment carries out hierarchical coding;
Step S130: described VTDU distinguishes the video layer that is fit to described CU according to the receiving ability of the CU of being known from described multi-medium data, send to described CU.
Video transferring and distribution method in the video monitoring of the present invention, wherein, in step S110, described VTDU receives CMS about carrying the dispatch command that described CU transmits the video of described PU visit to the application of described CMS proposition.
Video transferring and distribution method in the video monitoring of the present invention, wherein, in step S130, described VTDU is known the receiving ability of described CU by communicating by letter with described CU.
Video transferring and distribution method in the video monitoring of the present invention, wherein, in step S130, described VTDU receives the described communication that described CU carries out when the time interval of setting arrives, described VTDU knows that from described communication described CU is influenced by bandwidth change and the variation of the actual reception ability that takes place, the dynamic video layer that sends to described CU of adjusting.
Video transferring and distribution method in the video monitoring of the present invention, wherein, in step S130, the RTCP message that feeds back for the reception situation that described VTDU receives that described CU sends, comprise the quantity of data packets that has sent, the quantity of data packets of losing in the described message, described VTDU adjusts strategy according to the video layer of setting, and adjusts the level that sends video layer to described CU.
A kind of video frequency monitoring method comprises the steps:
Step S210:CU proposes the visit application to PU, and the video that is carried described visit by VTDU is transmitted;
Step S220: described PU equipment carries out hierarchical coding with the video image of gathering, and transmits the multi-medium data of this video image and gives described VTDU;
Step S230: described VTDU distinguishes the video layer that is fit to described CU according to the receiving ability of the CU of being known from described multi-medium data, send to described CU.
A kind of video of the video transferring and distribution method in the video monitoring of the present invention of realizing shifts dispensing device:
Described device comprises control module, transceiver module and is used to distinguish the hierarchical block of different video layer;
Described transceiver module comprises the receiving element that receives the multi-medium data that described PU equipment transmits and to the Dispatching Unit of described CU distributing multimedia data;
Described control module comprises control unit, and described control unit is controlled the multi-medium data that described receiving element receives the collection of described PU equipment and carries out hierarchical coding;
Described control module is controlled described hierarchical block according to the receiving ability of the CU of being known and distinguish the video layer that is fit to described CU from described multi-medium data, and sends to described CU by described Dispatching Unit.
Video of the present invention shifts dispensing device, and wherein, described control module also comprises the command reception unit, and described command reception unit is used to receive CMS about carrying the dispatch command that described accessing video is transmitted.
Video of the present invention shifts dispensing device, and wherein, described control module comprises also and be used for the communication unit of communicating by letter with described CU that described control module is communicated by letter with described CU by described communication unit and known the receiving ability of described CU.
Video of the present invention shifts dispensing device, wherein, described control module, receive the communication that described CU is carried out by described communication unit when the time interval of setting arrives, the variation of the actual reception ability that influenced by bandwidth change to take place according to the described CU of knowing from described communication, the dynamic level that sends video layer to described CU of adjusting.
Video of the present invention shifts dispensing device, wherein, described communication unit receives that described CU sends during video reception the RTCP message that feeds back for the reception situation, transmit the quantity that sends quantity of data packets and lost data packets that comprises in the described message in the computing unit of described control module, described control unit receives the output of described computing unit, and, adjust the level of the video layer that sends to described CU according to the video layer adjustment strategy of setting.
A kind of video monitoring system that realizes video frequency monitoring method of the present invention, comprise several PU equipment, several CU, at least one VTDU and the CMS that manages described VTDU, each PU equipment connects at least one camera, and described VTDU is that video of the present invention shifts dispensing device.
Video monitoring system of the present invention, wherein, described system comprises a plurality of VTDU, described CMS dispatches one of them described VTDU, carries described CU the video that described PU equipment conducts interviews is transmitted.
Video monitoring system of the present invention, wherein, at least two described CU arrive the different video layer of Bandwidth adaptation of described VTDU.
Video monitoring system of the present invention, preferred, also comprise network video recording unit.
As shown from the above technical solution, the present invention has following beneficial effect: the present invention is based on H3C iVS monitoring scheme, adopt the layered video coding method, VTDU is according to the receiving ability of different monitoring terminal, selection sends different video layers to this client, and the feedback by client, dynamically adjust.Adopt this method, head end encoder only gets final product with coding once, and VTDU also needn't be to the independent encoding and decoding of each obstructed client, and is not high to the performance requirement of each equipment.Can satisfy simultaneously different bandwidth client's demand well.CU is at reception period, constantly send the feedback message, wherein include the quantity of data packets that has sent, the statistics of losing such as quantity of data packets, the transmission that VTDU just can dynamically change video layer according to these information makes monitoring effect reach optimization to adapt to the ANOMALOUS VARIATIONS of network with effective feedback and minimum expense.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is a prior art video frequency monitoring method flow process;
Fig. 2 is the networking structure figure of video monitoring system of the present invention;
Fig. 3 is the video transferring and distribution method flow chart in the video monitoring of the embodiment of the invention;
Fig. 4 is the video frequency monitoring method flow chart of the embodiment of the invention;
Fig. 5 shifts the modular structure figure of dispensing device embodiment for video of the present invention.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings and the specific embodiments.
Video transferring and distribution method in the video monitoring of the present invention, utilization can be distinguished the VTDU of different video layer, and the layered encoded multi-medium data that will transmit from PU equipment sends corresponding video layer to described CU according to the receiving ability of CU.
Video transferring and distribution method in the video monitoring of the embodiment of the invention and video frequency monitoring method, VTDU is dispatched by CMS, and CU proposes to CMS the visit application of PU equipment, and CMS can make full use of the resource of video monitoring to the scheduling of VTDU.
Video transferring and distribution method in the video monitoring of the embodiment of the invention comprises the steps:
Step S110:VTDU carrying CU transmits the video of PU visit;
Step S120: described VTDU receives the collection of described PU equipment and carries out the multi-medium data of hierarchical coding;
Step S130: described VTDU distinguishes the video layer that is fit to described CU according to the receiving ability of the CU of being known from described multi-medium data, sends described video layer and finishes until this visit to described CU.
Video transferring and distribution method in the video monitoring of the present invention and video frequency monitoring method, in order to send the video layer that is fit to client CU, VTDU need be known the receiving ability of CU, can take static method, as configure the receiving ability of each CU in advance at VTDU, perhaps CU communicates by letter with described VTDU, informs the receiving ability of described CU; In order to satisfy the characteristic of network operation real-time change, VTDU more should be known the actual reception ability that influenced by bandwidth change of described CU dynamically.Can give the CU setting-up time at interval, when the time interval arrives, promptly communicate, make VTDU can know the variation of described CU actual reception ability, the dynamic video layer that sends to described CU of adjusting from described communication by CU and VDTU.Thereby the ANOMALOUS VARIATIONS that better adapts to network, the effect of enhancing video monitoring.
VTDU and CU this regularly or irregularly communicate by letter, can during the CU receiver, video, continue always, its mode also can send the feedback message to described VTDU by CU and substitute, can comprise the quantity of data packets that has sent, the quantity of data packets of losing in the described feedback message, make described VTDU adjust strategy, adjust the level that sends video layer to described CU according to the video layer of setting.
Video transferring and distribution method in the video monitoring of the present invention and video frequency monitoring method of the present invention, front end PU equipment need be supported layered video coding, client CU equipment need be supported the layered video decoding, video distribution equipment VTDU then needs to distinguish different video layers, distinguish the different video layer of described multi-medium data, and know dependence between each layer, and the bandwidth occupancy situation of each video layer, video distribution equipment VTDU also needs to distinguish the video layer that is fit to the CU receiving ability, for example needs occupied bandwidth just in time to be fit to the video layer of described CU receiving ability.
For example can set up four layers of following layered video:
1) elementary video is not subordinated to other any layer, its corresponding audio frequency association.
2) booster stage 1 comprises the B frame, is subordinated to elementary video, is designated as to be subordinated to elementary video session (Layer 0).
3) booster stage 2 is the SNR enhancing of elementary video, only is subordinated to elementary video (Layer 0), is designated as and is subordinated to the elementary video session.
4) booster stage 3 comprises the space enhancing of booster stage 2, is subordinated to the 2nd layer (Layer 2), means also to be subordinated to elementary video, is designated as and is subordinated to video layer 2.
Wherein the elementary video layer is essential, and it can provide the elementary video quality; On the basis that bandwidth and terminal capability allow, can receive, decoding enhancement layer improves video quality, obtains better video perception.
Video transferring and distribution method in the video monitoring of the embodiment of the invention, step S110 can be refined as step S111-S112, and step S130 can be refined as step S131-S138, and idiographic flow comprises the steps: as shown in Figure 3
Step S111:VTDU receives the dispatch command of CMS to the carrying visit.
Step S112: parse access client described in the instruction to the application that CMS proposes a certain PU of visit, promptly CMS is proposed the real-time video request of one of them camera passage of a certain PU of visit or a certain PU.The video that VTDU of CMS scheduling carries described visit shifts distributed tasks; Scheduling strategy can be identical with the VTDU scheduling strategy in the H3C iVS monitoring scheme.
Step S120:VTDU receives the multi-medium data that PU1 gathered and carried out hierarchical coding, and PU1 is a PU equipment of supporting layered video coding.
Step S131:VTDU and CU1 communicate, and know the receiving ability of CU1, and receiving ability at this moment is an initial receiving ability.In receiving course subsequently, along with the variation of network environment, the actual reception ability of CU may change.
Step S132:VTDU distinguishes by this CU1 receiving ability and sends suitable video layer to CU1; Because front end PU1 equipment adopts the different different video layers of session transmissions when transmitting layered encoded video image, therefore, VTDU can distinguish different video layers easily.VTDU is according to the receiving ability of the CU1 of knowing, and the video layer that transmission is fit to is given the CU1 that initiates access request.Here the ability that only needs VTDU to have identification different video layer gets final product, and does not need to do again code conversion.
Step S133:CU1 sends the feedback message at reception period to VTDU.This feedback message can be RTCP (Real time control protocol, a RTCP Real-time Transport Control Protocol) message, wherein includes the quantity of data packets that has sent, the statistics of losing such as quantity of data packets.
Step S134:VTDU resolves the RTCP message of receiving.VTDU can calculate packet loss according to the quantity of data packets that has sent, the quantity of data packets of losing, according to the adjustment strategy of setting, the transmission that dynamically changes video layer makes monitoring effect reach optimization to adapt to the ANOMALOUS VARIATIONS of network with effective feedback and minimum expense.As in network traffics peak times, the speed of Network Transmission is slack-off, makes the packet loss of multi-medium data transmission raise.
Step S135: judge whether to need to change video layer.Can be according to calculating the packet loss that is obtained, the adjustment strategy according to setting determines whether changing video layer; When for example packet loss reaches a certain threshold values, video layer is adjusted a level downwards, as booster stage 2 is adjusted into booster stage 1.Change then execution in step S136 as need; Otherwise execution in step S133.
Step S136: change the video layer that sends to CU, for example sent booster stage 2 to CU1 originally, because the packet loss showed increased changes into and sends the elementary video session,, when network congestion by the time alleviates, return to booster stage 2 more now to guarantee the continuity of monitoring.
Step S137: the notice that stops to carry this accessing video forwarding that judges whether to receive CMS.As receive then execution in step S138 of expiry notification; Otherwise change step S132 over to.
Step S138: receive the expiry notification of CMS, VTDU stops to send to the multi-medium data of CU1.The process of CU1 visit PU1 promptly is all over.
Video frequency monitoring method of the present invention comprises the steps:
Step S210:CU proposes the visit application to PU, and the video that is carried described visit by VTDU is transmitted;
Step S220: described PU equipment carries out hierarchical coding with the video image of gathering, and transmits the multi-medium data of this video image and gives described VTDU;
Step S230: described VTDU distinguishes the video layer that is fit to described CU according to the receiving ability of the CU of being known from described multi-medium data, sends described video layer and finishes until this visit to described CU.
As shown in Figure 2, the iVS operator scheme of the system schema of video frequency monitoring method of the present invention and H3C is basic identical.In iVS IP supervisory control system, CMS is a central manage-ment unit, the management of all devices in the system of being responsible for, VTDU is responsible for the forwarding of real-time video-voice frequency flow from PU to CU, can descend to hang one or more camera under each PU, PU manages down the camera of hanging with the camera passage, and each camera passage can produce one road real-time audio and video stream.When CU visits a certain PU, at first file an application to CMS, by the scheduling of CMS, distribute a VTDU to carry the task of forwarding.Video-voice frequency flow sends to VTDU from PU in real time, transmits or be distributed to CU by VTDU again., only need distribute one road real-time video-voice frequency flow and get final product when having other CU to visit same PU when follow-up, need between PU and VTDU, not pass one road real-time video-voice frequency flow again to this CU by same VTDU.VTDU adopts the server platform of high-performance (and the ability of forwarding and distribution processor is strong, supports that the way of video flowing is many) usually, and transfer capability is strong, can satisfy the networking demand of larger capacity.
The video frequency monitoring method of the embodiment of the invention, step S210 can be refined as step S211-S212, step S230 can be refined as step S231-S238, idiographic flow as shown in Figure 4, transmitting with the video of VTDU1 carrying CU2 visit PU2 is example, comprises the steps:
Step S211: client CU 2 at first sets the receiving ability of self terminal; Receiving ability can be resolution sizes, target bandwidth, decoding capability etc. and receives parameter or their combination; Decoding capability comprises the number of plies that CU can decode and the type that can decode, and the number of plies is many more, type is many more, illustrates that all decoding capability is strong more.
Step S212: 2 couples of CMS of client CU propose the application of visit PU2, promptly CMS are proposed the real-time video request of one of them camera passage of certain PU2 of visit or PU2.
Step S213:CMS dispatches a VTDU, for example carries the video transfer distributed tasks of described visit for VTDU1; Scheduling strategy can be identical with the VTDU scheduling strategy in the H3C iVS monitoring scheme.
Step S220:PU2 equipment is gathered video image, transmits multi-medium data behind the hierarchical coding and gives appointed VTDU1; PU2 is a PU equipment of supporting layered video coding.
Step S231:CU2 and VTDU1 communicate, and inform its receiving ability, and receiving ability at this moment is an initial receiving ability.In receiving course subsequently, along with the variation of network environment, the receiving ability of CU2 may change.
Step S232:VTDU1 distinguishes by the CU2 receiving ability and sends suitable video layer to CU2; Because front end PU2 adopts the different different video layers of session transmissions when transmitting layered encoded video image, therefore, VTDU can distinguish different video layers easily.VTDU1 is according to the receiving ability of the CU2 of knowing, and the multi-medium data of the video layer that transmission is fit to is given the CU2 that initiates access request.Here the ability that only needs VTDU1 to have identification different video layer gets final product, and does not need to do again code conversion.
Step S233:CU2 sends the feedback message at reception period to VTDU1.This feedback message can be the RTCP message, wherein includes the quantity of data packets that has sent, the statistics of losing such as quantity of data packets.
Step S234:VTDU resolves the RTCP message of receiving.VTDU can calculate packet loss according to the quantity of data packets that has sent, the quantity of data packets of losing, according to the adjustment strategy of setting, the transmission that dynamically changes video layer makes monitoring effect reach optimization to adapt to the ANOMALOUS VARIATIONS of network with effective feedback and minimum expense.As in network traffics peak times, the speed of Network Transmission is slack-off, makes the packet loss of video transmission raise.
Step S235: judge whether to need to change video layer.Can be according to calculating the packet loss that is obtained, the adjustment strategy according to setting determines whether changing video layer; When for example packet loss reaches a certain threshold values, video layer is adjusted a level downwards, as booster stage 2 is adjusted into booster stage 1.Change then execution in step S236 as need; Otherwise execution in step S233.
Step S236: change the video layer that sends to CU2, for example received booster stage 2 originally, because the packet loss showed increased changes into and receives the elementary video session,, when network congestion by the time alleviates, return to booster stage 2 more now to guarantee the continuity of monitoring.
Step S237:CMS judges whether CU2 reports the termination monitoring.As end to monitor then execution in step S238; As continue monitoring and then change step S232 over to.
The VTDU1 of this visit of step S238:CMS notice carrying stops to send to the multi-medium data of CU2, and VTDU1 stops to send to the multi-medium data of CU2.The process of a CU visit PU promptly is all over.VTDU can carry the video forwarding of a plurality of visits simultaneously.
Video frequency monitoring method of the present invention need to prove, core layer, convergence-level bandwidth generally are enough in the present network.What therefore the present invention emphasized is the situation that goes for broadband/narrow band access.Therefore adopting wideband transmit from PU to VTDU, then might be the arrowband from VTDU to CU; In addition, the signaling moiety of flow process of the present invention can adopt H.323 or SIP (Session InitiationProtocol, session initiation protocol); But recommend to adopt Session Initiation Protocol to realize from simplicity, standardized angle.
Video of the present invention shifts dispensing device, comprises control module, transceiver module and is used to distinguish the hierarchical block of different video layer;
As shown in Figure 5, the video of the embodiment of the invention shifts dispensing device, wherein, control module comprises control unit, receive the command reception unit of CMS instruction, calculate packet loss or receiving ability CALCULATION OF PARAMETERS unit and with the communication unit of client communication.Transceiver module comprises the receiving element and the Dispatching Unit that is used for to CU distribution of video layer of the multi-medium data of receiving front-end PU equipment.
As Fig. 2 and shown in Figure 5, the video of the embodiment of the invention shifts dispensing device, control module is controlled the layered encoded multi-medium data that transmits from PU equipment that described hierarchical block will receive from transceiver module, distinguish the different video layer of described multi-medium data, and know dependence between each layer, and the bandwidth occupancy situation of each video layer, distinguish the video layer that is fit to the CU receiving ability, for example need occupied bandwidth just in time to be fit to the video layer of described CU receiving ability, send described video layer in described CU by described transceiver module.
Detailed process is, after described command reception unit receives the instruction of CMS about the forwarding of carrying video, described receiving element receives the collection of described PU equipment and carries out the multi-medium data of hierarchical coding, be transmitted in described hierarchical block, described hierarchical block is distinguished the video layer that is fit to described CU according to the receiving ability of the CU of being known from described multi-medium data, send described video layer by described Dispatching Unit and finish until this visit to described CU.
Described communication unit is known the receiving ability of described CU by communicating by letter with described CU.Perhaps described communication unit, by receiving the communication that described CU is carried out when the time interval of setting arrives, the variation of the described CU receiving ability of knowing according to described communication, the dynamic level that sends video layer to described CU of adjusting.
Described communication unit also can receive the feedback message that described CU sends during video reception, transmit the quantity that sends quantity of data packets and lost data packets that comprises in the described feedback message in the control unit of described control module, described control unit is adjusted strategy according to the video layer of setting, and adjusts the level of the video layer that sends to described CU.
The video monitoring system of the embodiment of the invention, comprise several PU equipment, several CU, at least one VTDU and the CMS that manages described VTDU, each PU equipment connects at least one camera, and VTDU wherein is that the video of the embodiment of the invention shifts dispensing device.
The video monitoring system of the embodiment of the invention can comprise a plurality of VTDU, and described CMS dispatches one of them described VTDU, carries described CU the video of described PU device access is transmitted.
The video monitoring system of the embodiment of the invention, at least two described CU arrive the different video layer of Bandwidth adaptation of described VTDU.Be CU to VTDU, both can be broadband access, also can be narrow band access.
The video monitoring system of the embodiment of the invention can also comprise network video recording unit.
Above-described only is preferable possible embodiments of the present invention; described embodiment is not in order to limit scope of patent protection of the present invention; therefore the equivalent structure done of every utilization specification of the present invention and accompanying drawing content changes, and in like manner all should be included in protection scope of the present invention.
Claims (15)
1. the video transferring and distribution method in the video monitoring is characterized in that described method comprises the steps:
Step S110:VTDU carrying CU transmits the video of PU visit;
Step S120: described VTDU receives the multi-medium data that described PU equipment carries out hierarchical coding;
Step S130: described VTDU distinguishes the video layer that is fit to described CU according to the receiving ability of the CU of being known from described multi-medium data, send to described CU.
2. the video transferring and distribution method in the video monitoring as claimed in claim 1 is characterized in that, in step S110, described VTDU receives CMS about carrying the dispatch command that described CU transmits the video of described PU visit to the application of described CMS proposition.
3. the video transferring and distribution method in the video monitoring as claimed in claim 2 is characterized in that, in step S130, described VTDU is known the receiving ability of described CU by communicating by letter with described CU.
4. the video transferring and distribution method in the video monitoring as claimed in claim 3, it is characterized in that, in step S130, described VTDU receives the described communication that described CU carries out when the time interval of setting arrives, described VTDU knows that from described communication described CU is influenced by bandwidth change and the variation of the actual reception ability that takes place, the dynamic video layer that sends to described CU of adjusting.
5. the video transferring and distribution method in the video monitoring as claimed in claim 4, it is characterized in that: in step S130, the RTCP message that feeds back for the reception situation that described VTDU receives that described CU sends, comprise the quantity of data packets that has sent, the quantity of data packets of losing in the described message, described VTDU adjusts strategy according to the video layer of setting, and adjusts the level that sends video layer to described CU.
6. a video frequency monitoring method is characterized in that, described method comprises the steps:
Step S210:CU proposes the visit application to PU, and the video that is carried described visit by VTDU is transmitted;
Step S220: described PU equipment carries out hierarchical coding with the video image of gathering, and transmits the multi-medium data of this video image and gives described VTDU;
Step S230: described VTDU distinguishes the video layer that is fit to described CU according to the receiving ability of the CU of being known from described multi-medium data, send to described CU.
7. a video of realizing the video transferring and distribution method in the described video monitoring of claim 1 shifts dispensing device, it is characterized in that,
Described device comprises control module, transceiver module and is used to distinguish the hierarchical block of different video layer;
Described transceiver module comprises the receiving element that receives the multi-medium data that described PU equipment transmits and to the Dispatching Unit of described CU distributing multimedia data;
Described control module comprises control unit, and described control unit is controlled the multi-medium data that described receiving element receives the collection of described PU equipment and carries out hierarchical coding;
Described control module is controlled described hierarchical block according to the receiving ability of the CU of being known and distinguish the video layer that is fit to described CU from described multi-medium data, and sends to described CU by described Dispatching Unit.
8. video as claimed in claim 7 shifts dispensing device, and it is characterized in that: described control module also comprises the command reception unit, and described command reception unit is used to receive CMS about carrying the dispatch command that described accessing video is transmitted.
9. video as claimed in claim 8 shifts dispensing device, it is characterized in that, described control module comprises also and be used for the communication unit of communicating by letter with described CU that described control module is communicated by letter with described CU by described communication unit and known the receiving ability of described CU.
10. video as claimed in claim 9 shifts dispensing device, it is characterized in that: described control module, receive the communication that described CU is carried out by described communication unit when the time interval of setting arrives, the variation of the actual reception ability that influenced by bandwidth change to take place according to the described CU of knowing from described communication, the dynamic level that sends video layer to described CU of adjusting.
11. video as claimed in claim 10 shifts dispensing device, it is characterized in that: described communication unit receives that described CU sends during video reception the RTCP message that feeds back for the reception situation, transmit the quantity that sends quantity of data packets and lost data packets that comprises in the described message in the computing unit of described control module, described control unit receives the output of described computing unit, and, adjust the level of the video layer that sends to described CU according to the video layer adjustment strategy of setting.
12. video monitoring system that realizes the described video frequency monitoring method of claim 6, comprise several PU equipment, several CU, at least one VTDU and the CMS that manages described VTDU, each PU equipment connects at least one camera, it is characterized in that: described VTDU is that the arbitrary described video of claim 7-11 shifts dispensing device.
13. video monitoring system as claimed in claim 12 is characterized in that: described system comprises a plurality of VTDU, and described CMS dispatches one of them described VTDU, carries described CU the video that described PU equipment conducts interviews is transmitted.
14. video monitoring system as claimed in claim 12 is characterized in that: at least two described CU arrive the different video layer of Bandwidth adaptation of described VTDU.
15. video monitoring system as claimed in claim 12 is characterized in that: described video monitoring system also comprises network video recording unit.
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| CNA2008100009778A CN101198035A (en) | 2008-01-10 | 2008-01-10 | Video monitoring method, video transferring and distribution method and device and video monitoring system |
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