CN101334891A - Multichannel distributed plotting system and method - Google Patents
Multichannel distributed plotting system and method Download PDFInfo
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Abstract
The invention pertains to the field of an application of virtual reality of computer graphics, which relates to a distributed drawing system with multichannel and a method. The system of the invention adopts the structure of a client/server, and comprises a client, one or more servers and a network connecting the servers. The client and each server are provided with a graphics adapter supporting OpenGL library; the client and each server respectively run corresponding software, and each server is connected with display equipment such as a displayer or projector equipment, etc. The client adopts sharing scene data with multi process, and through extracting and packaging OpenGL drawing orders of each process and respectively sending the drawing orders to a corresponding server; therefore, a stitching display of distributed nodes and multi view display are realized, and the adaptability and flexibility of a system are enhanced.
Description
Technical field
The present invention relates to computer graphical virtual emulation application, relate in particular to a kind of multichannel distributed plotting system and method.
Background technology
Multi-channel system based on the three-dimensional scenic real-time rendering can provide a kind of immersive VR and emulation display environment.Based on the multi-channel system of three-dimensional scenic real-time rendering is special display system by one group of single pass display system splicing or the super wide ratio of hyperchannel that combines.Scene of Xian Shiing and related field and application is different as required, usually the radian between many projecting planes of multi-channel system is divided into 120,135,180,240,270,360 degree and does not wait.Because the screen display area of multi-channel system is huge, usually multi-channel system is used for some large-scale virtual emulation applications, begins in recent years to develop to professional domains such as display and demonstration, industrial design, educational training, conference centres.
According to the application of three-dimensional scenic real-time rendering multi-channel system, it can be divided into two aspects: be to use the small size scene of single channel on the one hand, produce large scale, high-resolution visual effect; Be used for while a plurality of viewpoints observation whole scene from different perspectives on the other hand.This special hyperchannel vision system not only has not available extremely strong visual impact of single channel display system and impact, and can allow the user obtain the full spectrum information of what comes into a driver's simultaneously, and information transfer capacity is brought up to a brand-new level.Its application is quite extensive, and cost is also very expensive simultaneously.Three-dimensional parallel drawing technology based on the PC cluster allows the low cost of above two kinds of application realize becoming possibility, and it can pass through a plurality of networking PC parallel drawing three-dimensional scenics, and from a plurality of passage output scenes, has realized three-dimensional scenic hyperchannel real-time rendering.
In addition, along with constantly widening of application, the complexity of three-dimensional scenic is more and more higher, the real-time of 3 D rendering, and fluency requires also more and more higher, and scene optimization just becomes the means of system performance raising and the focus of people's research gradually.Have only and adopt proper, efficient optimization method could allow the drafting of three-dimensional scenic rapider, picture is more smooth, just the three-dimensional scenic of large-scale complexity might be applied on the hyperchannel real-time rendering.Scene optimization is embodied in the influence of system performance: on the extendability of drafting frame per second, system and the popularity of system applies.
Three-dimensional parallel drawing system type based on the PC cluster has a lot, and the operating mechanism and the functioning side emphasis of dissimilar drawing parallel graphic systems have nothing in common with each other, and system performance is widely different under different applied environments, and has tangible personal feature.
At present, realized that preferably there are WireGL, AnyGL etc. in the parallel drawing system that large scale, high-resolution three-dimension scene show.Their system architecture is: client/server (Client/Server) has a client computer and a plurality of server.Client computer is equipped with application program module (comprising modified OpenGL storehouse and application program), not responsible drafting and demonstration.OpenGL stream and packing are intercepted and captured in the OpenGL storehouse of revising, and send to then on the server according to dispensed.Server only is responsible for receiving OpenGL stream and is wrapped and draw and show.The limitation of this method is that the shooting angle of video camera can not change all the time, can not realize multi-angle, the omnibearing observation of scene.
Another kind can realize simultaneously that the parallel drawing system of multi-angle observation three-dimensional scenic is Display Wall, and it adopts retained-mode, and system architecture is: main frame/slave (Master/Slave) has a Master and a plurality of Slave.Master and Slave are deployed with application program module much at one, and Master need be provided with channel parameters and the change information of scene in the relevant information of this parameter and the man-machine interaction is sent to a plurality of Slave; Slave changes the position and the attribute of camera position and fantasy sport object according to the information that receives.Master and Slave draw displayed scene by synchronous executive utility and realize parallel drawing.The limitation of this method is drawing data from this locality, causes the renewal of application program, data message and transplanting etc. to be difficult to realize.
Summary of the invention
The objective of the invention is limitation at prior art, adopt the system design of client/server architecture, wherein, the virtual three-dimensional scene data mode is shared in client computer employing multi-process, also sends to the method realization distributed parallel drafting of corresponding server respectively by the OpenGL rendering order of extraction and each process of packing.
To achieve these goals, the present invention proposes a kind of multichannel distributed plotting system.This system comprises a client computer, one or more server, one or more display device and the network that they are coupled together.Client computer and every station server all are equipped with the graphics adapter of supporting the OpenGL storehouse, client computer and the corresponding software of each self-operating of every station server, and every station server connects display devices such as display or projection.
Comprise two generic modules in the client computer: a client-side control program module and several client-side application program modules.Wherein, comprise control program, shared drive zone and virtual three-dimensional scene data in the client-side control program module; All comprise OpenGL storehouse and an application program of a modification in each application program module of client-side, this application program can be called the OpenGL storehouse of this modification.
All comprise a server-side application module in each server, each server-side application module comprises four submodules again: communication submodule, controlling sub, input submodule and display sub-module.System's each several part relation is as follows:
The user is provided with instruction from the client-side input channel, and system sends this instruction to the client-side control program module.Control program in the client computer control program module is responsible for receiving this instruction, finishes the setting of passage according to this instruction; Information transmission after the client computer control program module is finished setting is given each the client-side application program module in the client computer.
The client-side control program is read into the virtual three-dimensional scene data in the buffer memory of client computer, create then and shine upon the shared drive zone, again the virtual three-dimensional scene data are write in the shared drive zone, next notify each application program module in the client computer to read these virtual three-dimensional scene data.
The channel parameters that the reception earlier of each client-side application program module transmits from the client computer control program module is provided with the parameter of each video camera.In addition, the user also can be by the input submodule input control order of server end, system sends to client-side with the steering order that receives by network, and the control program in the client-side control program module upgrades the parameter of its corresponding video camera according to these command informations.
Control program in the client-side control program module sends the parameter of each video camera to corresponding application, application program is the virtual three-dimensional scene data in the sort out FOV (Field of View) from the shared drive zone, then by view frustums cutting, back side cutting and block the visible part that methods such as cutting are determined virtual three-dimensional scene, reject invisible part, from the OpenGL storehouse of revising, call corresponding OpenGL at visible part at last and draw instruction.After the OpenGL that the client-side application program was sent under the OpenGL storehouse of revising in each client-side application program module received separately draws instruction, intercept these instructions, be sent to by the user with its packing and by network and specified server be set by channel parameters.
The OpenGL stream bag of the corresponding application program that each server sends over by the communicator module subscribing client in the server-side application module separately, send it to controlling sub again, controlling sub is carried out decompress(ion) to OpenGL stream bag, again the data that obtain behind the decompress(ion) is sent into display sub-module.
The client-side control program module is responsible for realizing the synchronous of all server maps.By the control program in the client-side control program module synchronic command information is sent to communication submodule in each server by network.Communicator module subscribing client sends over synchronic command information, sends it to controlling sub again.Each controlling sub is finished synchronous operation according to synchronic command, waits for that the control program in the client-side control program module sends rendering order.After each server receives the rendering order that the control program in the client-side control program module sends, begin to carry out image rendering and show.
The concrete steps of system's implementation method comprise:
A carries out the passage setting in client computer
Client-server is unified into LAN (Local Area Network), and is every IP address that computer installation is different in the same network segment.The number of channels that the user sets by control program module input desire in client computer, and select splicing pattern or many viewpoints pattern.System copies to the OpenGL storehouse of application program and modification and passage one to one under the file according to the quantity of passage.Then, each passage corresponding server IP address is set in client computer, and is kept at each passage corresponding file folder down with the form of configuration file.
B carries out the video camera setting in the client computer control program module
According to the set channel parameters of step a, system determines camera parameters according to the selection of pattern according to the principle automatic or manual of perspective projection at client-side.Then, the parameter information after control program module is finished setting is transferred to each the client-side application program module in the client computer.
The user also can manually be provided with or revise the parameter of video camera according to the set channel parameters of step a at server end.Concrete steps are as follows: the user is by human-computer interaction device's input control order, system sends to client-side with the steering order that receives by network, control program in the client-side control program module upgrades the parameter of its corresponding video camera according to these command informations, and further sends the parameter of video camera to corresponding application.
C creates the shared drive district in the client computer control program module
Control program in the client-side control program module is read into the virtual three-dimensional scene data in the internal memory of client computer earlier, create and mapping shared drive zone, again the virtual three-dimensional scene data are write in the shared drive zone, next notify each application program module in the client computer to read these virtual three-dimensional scene data.
Each application program module of d client computer forms OpenGL and draws stream
Each client-side application program module is earlier according to through the passage of step a setting and the camera parameters that is provided with through step b corresponding server and video camera separately being set, parameter according to video camera reads the virtual three-dimensional scene data from the shared drive zone of creating through step c again, then by view frustums cutting, back side cutting and block the visible part that methods such as cutting are determined virtual three-dimensional scene, reject invisible part, call the OpenGL drafting instruction of modification at last at visible part, form OpenGL and draw stream.Carry out step e subsequently.
E OpenGL draws the intercepting and the transmission of stream
Different with general OpenGL storehouse, what adopt here is existing OpenGL storehouse through revising.It is not to draw demonstration immediately after drawing instruction that modified OpenGL storehouse receives OpenGL that the client-side application program module sends, but intercepts these instructions, and packing also is sent to by the user by network and by channel parameters specified server is set.
The f server is drawn preparation
Each server is at first drawn the stream bag by the OpenGL that the communicator module in the server-side application module separately receives the corresponding application program that sends over through step e, by controlling sub OpenGL is drawn the stream bag then and carry out decompress(ion), again the data that obtain behind the decompress(ion) are sent into display sub-module.Carry out step g subsequently.
The control program of g client computer control program module sends synchronizing signal to all servers
The client-side control program module is responsible for realizing the synchronous of all server maps.Because the OpenGL drafting stream bag that is sended over by each application program module in the client computer arrives synchronously through being difficult to realization after the Network Transmission, the scene that the uncertainty of this transmission can cause a plurality of server maps to go out is inconsistent.Therefore, system adopts the control program by the client-side control program module to reach the synchronous of drawing image to the mode that all servers send synchronic command.Carry out step h subsequently.
H draws demonstration
Each server is accepted the synchro control of client-side control program module, begins to carry out image rendering subsequently.
Compared with prior art, the invention has the advantages that:
A. can realize multiple channel pattern, both can realize the ultrahigh resolution tiled display, can realize that again the various visual angles of whole scene are drawn virtual three-dimensional scene.
B. can realize parallel drawing, improve drafting efficient, enlarge the adaptability of virtual three-dimensional scene.
C. application program is concentrated on client computer, and system deployment is convenient.
D. the virtual three-dimensional scene data centralization is stored in client, and system data information updating ratio is easier to.
Description of drawings
Fig. 1 is system's composition diagram;
Fig. 2 is a system organization structural representation of the present invention;
Fig. 3 is the arrangement synoptic diagram of four server tiled display video camera cones of the embodiment of the invention 1;
Fig. 4 is the arrangement synoptic diagram of four many drawing viewpoints of server video camera cones of the embodiment of the invention 2;
Wherein 1-client computer, 2-server, 3-network, 4-client-side control program module, the OpenGL dynamic link library that 5-client-side application program module, 6-shared drive zone, 7-control program, 8-virtual three-dimensional scene data, 9-application program, 10-revise, 11-server-side application module, 12-communication submodule, 13-controlling sub, 14-input submodule, 15-display sub-module.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.
The present invention is shown as example to realize the demonstration of 4 picture splicing patterns and 4 many viewpoints of the picture patterns that realize.
As shown in Figure 1, in order to realize that 4 picture splicing patterns show or 4 many viewpoints of picture patterns show that system need dispose 1 client computer (1) and 4 station servers (2), these 5 computing machines are connected in the same LAN (Local Area Network) (3).The communication modes of this LAN (Local Area Network) adopts ICP/IP protocol, is every IP address that computer installation is different in the same network segment.Dispose two generic modules at client-side: client-side control program module (4) and client-side application program module (5).
Client-side control program module (4) comprising: shared drive zone (6), control program (7) and virtual three-dimensional scene data (8).
The client-side control program module is given a plurality of client-side application access by the mode of the virtual three-dimensional scene data being put into the shared drive zone with the virtual three-dimensional scene data sharing of client-side; The client-side control program module also is responsible for finishing according to user's instruction the setting of passage, changes camera parameters; The client-side control program module also is responsible for the synchronous of each server node drafting.
Client computer is deposited virtual three-dimensional scene data (8) and is opened for client-side control program (7), system copies to the OpenGL storehouse of application program and modification and passage one to one under the file according to the quantity of passage, then, each passage corresponding server IP address is set in client computer, and is kept at each passage corresponding file folder down with the form of configuration file.Client applications (9) leaves under the different paths so that read different configuration files, and then realizes the corresponding one by one of client applications (9) and server (2).Client computer is communicated by letter with the network process between server, mainly is the transmission and the reception of OpenGL instruction stream.
A server application module of each server disposition (11), this application program module (11) is divided into 4 submodules: communication submodule (12), controlling sub (13), input submodule (14) and display sub-module (15).Communication submodule (12) is responsible for the synchronic command that OpenGL instructs and client-side control program (7) sends that subscribing client application program module (5) is called from the OpenGL storehouse (10) of revising, and the user is sent to client computer corresponding application program (9) by the control command of importing submodule (14) input.
Configure the network environment of client-server, the IP address setting of client computer is 10.0.0.1, and the IP address of four servers is respectively 10.0.0.2～10.0.0.5.In client computer, be 4, and select the splicing pattern by control program module input channel quantity.Setting up 4 files in client computer is respectively: 1,2,3,4, and the OpenGL storehouse of client applications and modification copied to respectively in the file 1,2,3,4.What adopted in the OpenGL storehouse of above-mentioned modification is the WireGL storehouse, WireGL orders OpenGL and expands, permission OpenGL order moves on network, uses the optimization of caching strategy and strictness to reduce network bandwidth requirements and eliminate the bottleneck that the network bandwidth causes.Set up 4 text configuration files in 4 files, the configuration file record IP address in the file 1～4 is respectively 10.0.0.2～10.0.0.5.Start the application program of each server, start the application program under each file then respectively.
The layout of 4 video cameras as shown in Figure 3, seamless spliced in order to realize, the cone adopts perspective oblique projection matrix, and the cone is set to OABDE, OBCEF, ODEGH, OEFHI respectively, wherein A, B, C, D, E, F, G, H and I are on same plane, and the far plane of 4 cones is on this plane; Also on same plane, the hither plane of 4 cones is on this plane for A ', B ', C ', D ', E ', F ', G ', H ' and I '.Parameter information after control program module is finished setting is transferred to each the client-side application program module in the client computer.
Control program in the client-side control program module is read into virtual three-dimensional scene data scene.3ds in the internal memory of client computer earlier, create and shine upon the shared drive zone of 100M, scene.3ds is write in the shared drive zone again, next notify each application program module in the client computer to read scene.3ds data in the shared drive.
4 application program modules 1～4 of client-side are set up link by Socket and server 10.0.0.2～10.0.0.5 earlier.Then, press cone OABDE respectively, OBCEF, ODEGH, OEFHI reads the scene.3ds data in the shared drive, then by the view frustums cutting, back side cutting and block the visible part that method of cutting out is determined virtual three-dimensional scene, reject invisible part, call WireGL at visible part at last and draw instruction, it is not to draw demonstration immediately after drawing instruction that the WireGL storehouse receives OpenGL that the client-side application program module sends, but intercepting these instructions and packing, application program module 1～4 will be drawn the instruction bag respectively and be sent to server 10.0.0.2～10.0.0.5.
Server 10.0.0.2～10.0.0.5 draws the stream bag by the OpenGL that the communicator module in the application program module separately receives the application program 1～4 that sends over, by controlling sub OpenGL is drawn the stream bag then and carry out decompress(ion), again the data that obtain behind the decompress(ion) are sent into display sub-module.
The client-side control program module sends synchronizing signal BeginRender to server 10.0.0.2～10.0.0.5.
Server 10.0.0.2～10.0.0.5 receives synchronous control signal BeginRender, the beginning image rendering.
Configure the network environment of client-server, the IP address setting of client computer is 10.0.0.1, and the IP address of four servers is respectively 10.0.0.2～10.0.0.5.In client computer, be 4, and select many viewpoints pattern by control program module input channel quantity.Setting up 4 files in client computer is respectively: 1,2,3,4, and the OpenGL storehouse of client applications and modification copied to respectively in the file 1,2,3,4.What adopted in the OpenGL storehouse of above-mentioned modification is the WireGL storehouse, WireGL orders OpenGL and expands, permission OpenGL order moves on network, uses the optimization of caching strategy and strictness to reduce network bandwidth requirements and eliminate the bottleneck that the network bandwidth causes.Set up 4 text configuration files in 4 files, the configuration file record IP address in the file 1～4 is respectively 10.0.0.2～10.0.0.5.Start the application program of each server, start the application program under each file then respectively.
The layout of 4 video cameras as shown in Figure 4 when system carried out the demonstration of many viewpoints pattern, 4 cones are set to OABDE, OBCEF, ODEGH, OEFHI respectively, ABDE, BCEF, DEGH, EFHI are respectively the cross section far away of the cone, A ' B ' D ' E ', B ' C ' E ' F ', D ' E ' G ' H ', E ' F ' H ' I ' are respectively the nearly cross section of the cone, and the parameter of each video camera is set with regard to putting O and 4 points in each nearly cross section and the distance in cross section far away according to the observation.
Control program in the client-side control program module is read into virtual three-dimensional scene data scene.3ds in the internal memory of client computer earlier, create and shine upon the shared drive zone of 100M, scene.3ds is write in the shared drive zone again, next notify each application program module in the client computer to read scene.3ds data in the shared drive.
4 application program modules 1～4 of client-side are set up link by Socket and server 10.0.0.2～10.0.0.5 earlier.Then, press cone OABDE respectively, OBCEF, ODEGH, OEFHI reads the scene.3ds data in the shared drive, then by the view frustums cutting, back side cutting and block the visible part that method of cutting out is determined virtual three-dimensional scene, reject invisible part, call WireGL at visible part at last and draw instruction, it is not to draw demonstration immediately after drawing instruction that the WireGL storehouse receives OpenGL that the client-side application program module sends, but tackled by the OpenGL32.dll in WireGL storehouse, and the instruction that will be blocked packing, application program module 1～4 will be drawn the instruction bag respectively and be sent to server 10.0.0.2～10.0.0.5.
Server 10.0.0.2～10.0.0.5 draws the stream bag by the OpenGL that the communicator module in the application program module separately receives the application program 1～4 that sends over, by controlling sub OpenGL is drawn the stream bag then and carry out decompress(ion), again the data that obtain behind the decompress(ion) are sent into display sub-module.
The client-side control program module sends synchronizing signal BeginRender to server 10.0.0.2～10.0.0.5.
Server 10.0.0.2～10.0.0.5 receives synchronous control signal BeginRender, the beginning image rendering.
Claims (2)
1, a kind of multichannel distributed plotting system comprises a client computer, one or more server, one or more display device and with the network that they couple together, it is characterized in that:
Comprise two generic modules in the client computer: a client-side control program module and several client-side application program modules wherein, comprise control program, shared drive zone and virtual three-dimensional scene data in the client-side control program module; All comprise OpenGL storehouse and an application program of a modification in each application program module of client-side, this application program can be called the OpenGL storehouse of this modification;
All comprise a server-side application module in each server, each server-side application module comprises four submodules again: communication submodule, controlling sub, input submodule and display sub-module;
System's each several part relation is as follows:
The user is provided with instruction from the client-side input channel, and system sends this instruction to the client-side control program module, and the control program in the client computer control program module is responsible for receiving this instruction, finishes the setting of passage according to this instruction; The user can also be by the input submodule input control order of server end, system sends to client-side with the steering order that receives by network, and the control program in the client-side control program module upgrades the parameter of its corresponding video camera according to these command informations; Information transmission after the client computer control program module is finished setting is given each the client-side application program module in the client computer;
The client-side control program is read into the virtual three-dimensional scene data in the buffer memory of client computer, create then and shine upon the shared drive zone, again the virtual three-dimensional scene data are write in the shared drive zone, next notify each application program module in the client computer to read these virtual three-dimensional scene data;
The channel parameters that the reception earlier of each client-side application program module transmits from the client computer control program module is provided with the parameter of each video camera;
Control program in the client-side control program module sends the parameter of each video camera to corresponding application, application program is the virtual three-dimensional scene data in the sort out FOV (Field of View) from the shared drive zone, then by view frustums cutting, back side cutting and block the visible part that methods such as cutting are determined virtual three-dimensional scene, reject invisible part, from the OpenGL storehouse of revising, call corresponding OpenGL at visible part at last and draw instruction; After the OpenGL that the client-side application program was sent under the OpenGL storehouse of revising in each client-side application program module received separately draws instruction, intercept these instructions, be sent to by the user with its packing and by network and specified server be set by channel parameters;
The OpenGL stream bag of the corresponding application program that each server sends over by the communicator module subscribing client in the server-side application module separately, send it to controlling sub again, controlling sub is carried out decompress(ion) to OpenGL stream bag, again the data that obtain behind the decompress(ion) is sent into display sub-module;
The client-side control program module is responsible for realizing the synchronous of all server maps, by the control program in the client-side control program module synchronic command information is sent to communication submodule in each server by network, communicator module subscribing client sends over synchronic command information, send it to controlling sub again, each controlling sub is finished synchronous operation according to synchronic command, wait for that the control program in the client-side control program module sends rendering order, after each server receives the rendering order that the control program in the client-side control program module sends, begin to carry out image rendering and show.
2, a kind of implementation method of multichannel distributed plotting system is characterized in that concrete steps comprise:
A carries out the passage setting in client computer
Client-server is unified into LAN (Local Area Network), and in the same network segment every IP address that computer installation is different, the number of channels that the user sets by control program module input desire in client computer, and selection splicing pattern or many viewpoints pattern, system copies to the OpenGL storehouse of application program and modification and passage one to one under the file according to the quantity of passage, then, each passage corresponding server IP address is set in client computer, and is kept at each passage corresponding file folder down with the form of configuration file;
B carries out the video camera setting in the client computer control program module
According to the set channel parameters of step a, system determines camera parameters according to the selection of pattern according to the principle automatic or manual of perspective projection at client-side; The user can also be by the input submodule input control order of server end, system sends to client-side with the steering order that receives by network, and the control program in the client-side control program module upgrades the parameter of its corresponding video camera according to these command informations; Then, the parameter information after control program module is finished setting is transferred to each the client-side application program module in the client computer;
C creates the shared drive district in the client computer control program module
Control program in the client-side control program module is read into the virtual three-dimensional scene data in the internal memory of client computer earlier, create and mapping shared drive zone, again the virtual three-dimensional scene data are write in the shared drive zone, next notify each application program module in the client computer to read these virtual three-dimensional scene data;
Each application program module of d client computer forms OpenGL and draws stream
Each client-side application program module is earlier according to through the passage of step a setting and the camera parameters that is provided with through step b corresponding server and video camera separately being set, parameter according to video camera reads the virtual three-dimensional scene data from the shared drive zone of creating through step c again, then by view frustums cutting, back side cutting and block the visible part that methods such as cutting are determined virtual three-dimensional scene, reject invisible part, call the OpenGL drafting instruction of modification at last at visible part, form OpenGL and draw stream.Carry out step e subsequently;
E OpenGL draws the intercepting and the transmission of stream
Different with general OpenGL storehouse, what adopt here is existing OpenGL storehouse through revising, it is not to draw demonstration immediately after drawing instruction that modified OpenGL storehouse receives OpenGL that the client-side application program module sends, but intercepting these instructions, packing also is sent to by the user by network and by channel parameters specified server is set;
The f server is drawn preparation
Each server is at first drawn the stream bag by the OpenGL that the communicator module in the server-side application module separately receives the corresponding application program that sends over through step e, by controlling sub OpenGL is drawn the stream bag then and carry out decompress(ion), again the data that obtain behind the decompress(ion) are sent into display sub-module, carry out step g subsequently;
The control program of g client computer control program module sends synchronizing signal to all servers, carries out step h subsequently;
H draws demonstration
Each server is accepted the synchro control of client-side control program module, begins to carry out image rendering subsequently.
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| CN104504650A (en) * | 2014-12-31 | 2015-04-08 | 深圳市航盛电子股份有限公司 | OpenGL (open graphics library) based multi-channel video stitching method and system |
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