CN104349020A - Virtual camera and real camera switching system and method - Google Patents
Virtual camera and real camera switching system and method Download PDFInfo
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- CN104349020A CN104349020A CN201410716397.4A CN201410716397A CN104349020A CN 104349020 A CN104349020 A CN 104349020A CN 201410716397 A CN201410716397 A CN 201410716397A CN 104349020 A CN104349020 A CN 104349020A
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Abstract
The invention relates to a virtual camera and real camera switching system and method. The system comprises a real camera, wherein the real camera is connected with a chroma key device, a synthesis rendering server is connected with a virtual camera controller, a virtual camera parameter generating device connected with the real camera and the virtual camera controller is arranged inside the synthesis rendering server, a virtual camera and the virtual camera parameter generating device are connected with a synthesis device, the synthesis device is connected with the chroma key device, and a foreground generating device, a background generating device and an output device which are connected with the synthesis device are further arranged inside the synthesis rendering server. According to the method, virtual foregrounds, virtual backgrounds and virtual persons are fabricated in field and are fast synthesized, the switching of a field real scene and a virtual scene is realized through the operation of the virtual camera controller to the scene, the limitation of the real camera when the real camera shoots a virtual object is compensated, and the program expressive force of a virtual studio is greatly improved.
Description
Technical field
The present invention relates to the system and method that a kind of virtual video camera and real camera switch.Being a kind of system and method for Video Image process, is a kind of system and method for the process of digital video tv trick.
Background technology
Virtual studio comprises a series of equipment, mainly virtual article is implanted in the real scene of video camera shooting, to improve the form of expression of program.General virtual studio can comprise one or several equipment following: orientable camera apparatus, blue case, chroma key device, the equipment such as virtual rendering server.Obtained the position of real camera by orientable video camera, virtual article is placed into real camera space, realize the effect that virtual article and real camera are synchronized with the movement.Blue case coordinates chroma key device can remove unwanted picture, only retains specific picture element, makes the combination of virtual scene and real scene truer.The picture of virtual article/virtual portrait that virtual rendering server generates, and the real picture that itself and video camera are taken is superimposed, form final output picture.Due to current virtual studio, the virtual article of implantation can only as virtual prospect or virtual background.
Virtual prospect refers to that virtual article can only be added to before real camera shooting picture.Virtual prospect can cooperatively interact with outdoor scene scene, strengthens the expressive force of outdoor scene.Virtual background refers to that picture that real camera is taken can only be added to before virtual article.Virtual background generally will coordinate the use of blue case and chroma key device.The environment of surrounding can be switched like this by different virtual backgrounds, studio can be made more flexible.
Virtual prospect and virtual background can appear in final output picture simultaneously, but virtual prospect and virtual background cannot realize three-dimensional hiding relation, and virtual prospect is forever before virtual background.
In existing virtual studio, the position of virtual video camera can only be consistent completely with the position of real camera.Camera lens focal length is the key factor that restriction represents object more details, takes the restriction that the field range obtained is subject to camera angles simultaneously.Although in present virtual studio, real camera is generally at fixing The Cloud Terrace, rocking arm, guide rail etc. have on the device of certain activity surplus, extend the shooting visual field.But the video camera on fixing The Cloud Terrace can not move in shooting process, can only rotary camera and change the visual angle of video camera, though and rocking arm and guide rail energy mobile camera position, also can only mobile camera in limited range.And the visual angle change of video camera itself (camera angles is relevant with lens focus size with image-forming component (CCD) size) is also limited, therefore existing virtual studio is difficult to free-roaming (to breadth and depth expansion) in virtual scene.In traditional virtual studio, real camera can only change the parameters such as its position, direction, Zoom by devices such as The Cloud Terrace, rocking arm, guide rails.But due to its physical restriction, the field range that may reach of real camera is limited, cannot photograph the various piece of virtual scene.
Summary of the invention
For solving the problem of prior art, the present invention proposes the system and method that a kind of virtual video camera and real camera switch.Described system and method is by external hardware device or broadcast control software design and trigger the service of playing up and switch real camera and virtual video camera, and when real camera and virtual camera position inconsistent time energy automatic smoothing transition.When rendering server is switched to virtual video camera, real camera capture video is processed, make it can follow virtual video camera motion.
The present invention can make virtual video camera exceed the visual field boundary of real camera, can according to program demand free-roaming in virtual scene, and the video that real camera is taken again can be projected under virtual video camera space, improve the sense of reality of picture, promote the degree of freedom of program creator.
The object of the present invention is achieved like this: the system that a kind of virtual video camera and real camera switch, comprise: the real camera be connected with synthesis rendering server, described real camera is connected with chroma key device, it is characterized in that, described synthesis rendering server is connected with virtual video camera controller, the virtual video camera be connected with real camera and virtual video camera controller is provided with in described synthesis rendering server, described virtual video camera is connected with synthesizer, described synthesizer is connected with described chroma key device, the prospect generating apparatus be connected with synthesizer is also provided with in described synthesis rendering server, Background generation device and output device
Further, the control peripheral hardware of described virtual video camera controller is the one in keyboard, mouse, touch-screen or rocking bar.
Further, described synthesis rendering server is used for the state according to virtual video camera, virtual prospect, virtual background etc. in virtual scene are played up picture, and carries out superposing with the picture that real camera is taken and synthesize, final synthesis picture is delivered to output device and export; Described virtual video camera controller is used for controlling that virtual video camera moves in the position in virtual environment space, the change pointed to, picture propelling zoom out and the change in location etc. of focus; Described virtual video camera parameter generation device accepts the control command of virtual video camera controller, control command is converted to the parameter of virtual video camera, the parameter of program to virtual video camera that virtual video camera parameter generation device can also preset according to software changes and generates, virtual video camera parameter generation device by the Parameter transfer of virtual video camera to virtual video camera for follow-up; Virtual video camera Parameter transfer uses to synthesizer by described virtual video camera; Described prospect generating apparatus can create virtual prospect, also three-dimensional animation production device be can receive and virtual scene and virtual portrait made, and from virtual environment, specify virtual prospect, prospect generating apparatus obtains current virtual camera parameters by synthesizer, according to virtual video camera parameter generating virtual foreground picture; Described Background generation device can create virtual background, also three-dimensional animation production device be can receive and virtual scene and virtual portrait made, and virtual background is specified from virtual environment, Background generation device obtains current virtual camera parameters by synthesizer, according to virtual video camera parameter generating virtual background frame; Described synthesizer receives the parameter that virtual video camera transmits, the real camera shooting picture that reception chroma key device transmits and key, the picture of generating virtual foreground picture and virtual background picture and other virtual article/virtual portraits, virtual foreground picture, virtual article/virtual portrait picture, real camera shooting picture, the superposition of virtual background picture are synthesized, and are sent output device to export synthesis result by the definition according to Virtual Space; The picture that synthesizer is sent here by described output device is delivered to broadcast after completing necessary data, signal conversion and is used.
Further, described virtual video camera can have one or more, one of them is as current main virtual video camera, main virtual video camera can be specified by virtual video camera controller and change, also can be specified by virtual video camera parameter generation device and change, the parameter of main virtual video camera be delivered to synthesizer and is synthesized for image rendering;
Further, the parameter of described virtual video camera comprises three dimensional space coordinate, Zoom, focus parameter;
Use the method that the virtual video camera of said system and real camera switch, the step of described method is as follows:
The process of preparation:
Make and arrange the step of virtual scene: make virtual scene and virtual portrait and virtual article for three-dimensional animation production device, or make virtual prospect, virtual background and virtual portrait and virtual article for described prospect generating apparatus and Background generation device; Or specify virtual prospect and virtual background for described prospect generating apparatus and Background generation device according to the virtual scene that three-dimensional animation production device completes;
The step of calibrating camera: for obtaining three dimensional space coordinate, Zoom, focus parameter of real camera, is sent in three-dimensional animation production device and virtual video camera parameter generation device by the three dimensional space coordinate of the real camera of acquisition, Zoom, focus parameter;
The step of generating virtual video camera, for the parameter information of rendering server according to parameter acquiring real camera proven in " step of calibrating camera ", generating virtual video camera; Or the virtual environment completed according to three-dimensional animation production device generating virtual video camera is set; When there being multiple virtual video camera to exist, certain virtual video camera is specified to be current main virtual video camera by virtual video camera control device or virtual video camera parameter generation device;
The process broadcasted:
The step that real camera shooting is broadcasted: under operator controls, studio scene and host, welcome guest etc. are taken for real camera, and give synthesis rendering server by capture video signal by chroma key device; The parameter of real camera passes to the virtual video camera parameter generation device of synthesis rendering server in real time; The synthesis rendering server vision signal of being taken by real camera by synthesizer and prospect generating apparatus, Background generation device or synthesizer are played up after the virtual foreground picture of generation, virtual background picture, virtual portrait and virtual article picture superpose and synthesize according to real camera parameter, deliver to output device and externally broadcast;
Send real camera and switch to the step of virtual video camera instruction: for sending by synthesis rendering server or virtual video camera controller the instruction switching to virtual video camera from real camera according to broadcast demand or scene script calls;
The step of composograph: for each parameter of virtual video camera parameter generation device according to the instruction generating virtual video camera of virtual video camera controller, or virtual video camera parameter generation device is according to each parameter of the control command generating virtual video camera of the good script of pre-edit, virtual video camera receives the parameter that the transmission of virtual video camera parameter generation device comes, the instruction accepting virtual video camera parameter generation device or virtual video camera controller switches main virtual video camera, and the parameter of unique virtual video camera or main camera is sent to synthesizer, prospect generating apparatus, Background generation device plays up generating virtual foreground picture and virtual background picture according to the virtual video camera parameter obtained from synthesizer, synthesizer also independently can play up generating virtual foreground picture according to virtual video camera parameter, virtual background picture, virtual portrait and virtual article picture, the video that real camera is taken by synthesizer is played up according to virtual video camera parameter, and to playing up the real camera capture video picture of generation and virtual foreground picture, virtual background picture, virtual portrait and virtual article picture carry out superposition synthesis and export,
Send the step of virtual video camera switchback real camera instruction: for the demand according to program, send the instruction of virtual video camera switchback real camera;
The step of switchback real camera: rendering server is after receiving order, controlled the direction of motion and the speed of virtual video camera according to the movement velocity of virtual video camera and curve movement by virtual video camera parameter generation device, each parameter of the real camera when virtual video camera parameter generation device in rendering server switches to virtual video camera according to real camera, by virtual video camera from parameter current smooth interpolation to real camera parameter, during smooth interpolation, keep playing up and exporting virtual scene always; After virtual video camera is consistent with real camera parameter, forward the step that real camera shooting is broadcasted to.The beneficial effect that the present invention produces is: the present invention is by the virtual prospect of field fabrication in rendering server, virtual background and virtual portrait, Fast back-projection algorithm, generating virtual scene, and carry out operating more freely diversified cooperation and the switching that realize on-the-spot real scene and virtual scene to scene by virtual video camera controller, compensate for the limitation to performance virtual scene in real camera motion limitation situation, the more details of virtual article and larger field range can be represented by the free movement of virtual video camera in virtual scene, bring brand-new visual experience, improve the program expressive force of virtual studio greatly.Many trigger sources toggling camera switches.Can external hardware device be passed through, comprise keyboard, the switchings such as rocking bar, by broadcasting the multiple switch means such as control software design, can also can realizing the automatic interpolation process when switching between virtual video camera and real camera, ensureing seamlessly transitting of switching.The control mode of multiple virtual video camera, can pass through keyboard, rocking bar controls the motion of virtual video camera.The motion of video camera can also be controlled by prefabricated trajectory path.Also can comprise script by program, the modes such as plug-in unit control camera motion.The video of real camera shooting is again played up in the virtual scene space of virtual video camera, ensure that the viewing experience that picture is good to greatest extent.Be prefixed multiple virtual video camera, docking that on the one hand can be more level and smooth with the multiple stage real camera that may arrange in studio; On the other hand, every platform virtual video camera can use the lens parameters of different qualities, as wide-angle lens, common lens, Macro Lens can be had first-class, often kind of camera lens is different to the rendering effect of virtual scene, further increases the expressive force to virtual scene, virtual article.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the theory diagram of an inventive embodiments system;
Fig. 2 is the implementation procedure block diagram of method described in inventive embodiments three.
Embodiment
Embodiment one:
The present embodiment is the system that a kind of virtual video camera and real camera switch, as shown in Figure 1.The present embodiment comprises: the real camera be connected with synthesis rendering server, described real camera is connected with chroma key device, described synthesis rendering server is connected with virtual video camera controller, the virtual video camera be connected with real camera and virtual video camera controller is provided with in described synthesis rendering server, described virtual video camera is connected with synthesizer, described synthesizer is connected with described chroma key device, is also provided with the prospect generating apparatus, Background generation device and the output device that are connected with synthesizer in described synthesis rendering server.
Described synthesis rendering server is used for the state according to virtual video camera, virtual prospect, virtual background etc. in virtual scene are played up picture, and carry out superposing with the picture that real camera is taken and synthesize, final synthesis picture is delivered to output device and export; Described virtual video camera controller is used for controlling that virtual video camera moves in the position in virtual environment space, the change pointed to, picture propelling zoom out and the change in location etc. of focus; Described virtual video camera parameter generation device accepts the control command of virtual video camera controller, control command is converted to the parameter of virtual video camera, the parameter of program to virtual video camera that virtual video camera parameter generation device can also preset according to software changes and generates, virtual video camera parameter generation device by the Parameter transfer of virtual video camera to virtual video camera for follow-up; Virtual video camera Parameter transfer uses to synthesizer by described virtual video camera; Described prospect generating apparatus can create virtual prospect, also three-dimensional animation production device be can receive and virtual scene and virtual portrait made, and from virtual environment, specify virtual prospect, prospect generating apparatus obtains current virtual camera parameters by synthesizer, according to virtual video camera parameter generating virtual foreground picture; Described Background generation device can create virtual background, also three-dimensional animation production device be can receive and virtual scene and virtual portrait made, and virtual background is specified from virtual environment, Background generation device obtains current virtual camera parameters by synthesizer, according to virtual video camera parameter generating virtual background frame; Described synthesizer receives the parameter that virtual video camera transmits, the real camera shooting picture that reception chroma key device transmits and key, the picture of generating virtual foreground picture and virtual background picture and other virtual article/virtual portraits, virtual foreground picture, virtual article/virtual portrait picture, real camera shooting picture, the superposition of virtual background picture are synthesized, and are sent output device to export synthesis result by the definition according to Virtual Space; The picture that synthesizer is sent here by described output device is delivered to broadcast after completing necessary data, signal conversion and is used.
Real camera described in the present embodiment is the general name of the camera system that digital camera and relevant server are formed, with virtual video camera comparatively speaking.Virtual video camera is available in the Virtual Space of computer three-dimensional cartoon making or the virtual scene of virtual studio, for the virtual concept played up, virtual video camera reality is made up of multiple camera parameter, utilize these parameters can carry out mating and switching with the corresponding parameter of real camera, these parameters are synthesized rendering server and are used for according to the virtual scene generating virtual video pictures of well in advance.
Rendering server described in the present embodiment can be a station server, also can be a server cluster, there is very powerful disposal ability, because carry out at the scene needing quick, a large amount of image real time transfer when playing up process, the carrying out of multiple servers multithreading can be used to process, complete process will be played up within the shortest time.
Prospect generating apparatus possesses several functions, and it both can create the virtual prospect in virtual scene, and the part in the threedimensional model that also three-dimensional animation production device can be generated is appointed as virtual prospect; Same Background generation device it both can create virtual background in virtual scene, the part in the threedimensional model that also three-dimensional animation production device can be generated be appointed as virtual background.Certainly virtual prospect here and virtual background need the logical relation that meets in Virtual Space.On the other hand, virtual prospect and virtual background according to the parameter of current virtual video camera, can also be played up generating virtual foreground picture and virtual background picture by prospect generating apparatus and Background generation device.Prospect generating apparatus and Background generation device can be custom-designed hardware systems, also can be mounted in the software systems in synthesis rendering server, or the system that hardware and software is formed.Although three-dimensional animation production device is not a part for switched system, also can be arranged in synthesis rendering server, make some simple animation models in order to scene, more complicated animation model and scene then need carrying out in advance.
Virtual video camera controller can be the subsystem that a series of hardware and control software design are formed.Can be the virtual controlling key such as button, rocking bar utilizing mouse, keyboard, touch-screen etc. to control peripheral hardware control on screen, also can be real rocking bar, in order to control the direction of motion all around and the movement velocity of virtual video camera.
Synthesizer is device virtual image and true picture being carried out synthesizing.The virtual scene of virtual studio is when making; usual meeting is according to the dummy object of the physical structure virtual scene of studio (and blue case) and environment; synthesizer can according to virtual foreground object and virtual background object the location parameter in virtual scene; real picture and virtual prospect, the virtual background of the shooting of process real camera synthesize the space overlapping relation of the image rendered, thus the synthesis picture generating realistic three-dimensional virtual environment and true picture is for broadcasting.According to the design parameter of real camera and the parameter of virtual video camera, synthesizer when meet visual angle rationally and space hiding relation, also the picture that virtual environment renders may only be exported, or only export the picture of real camera shooting, but the picture of real camera shooting often exports after the conversion of certain space projection, to meet the motion conditions of real camera and virtual video camera at that time.
Embodiment two:
The present embodiment is the improvement of embodiment one, is the refinement of embodiment one about virtual video camera controller.Virtual video camera controller control peripheral hardware described in the present embodiment is the one in keyboard, mouse, touch-screen or rocking bar.
The mode the most easily that to operate in reality of virtual video camera and real camera still adopts rocking bar, but the various virtual keys on screen can be used in certain operations to control virtual video cameras, as: host's enterprising line operate of touch-screen etc. at the scene.Same, using mouse can realize convenient the representing of dummy object in some cases, as directly jumped to certain certain viewing angles, or allowing video camera move along pre-set path.
Embodiment three:
The present embodiment is the improvement of embodiment one, the refinement of embodiment one about virtual video camera implementation, described virtual video camera can have one or more, one of them is as current main virtual video camera, main virtual video camera can be specified by virtual video camera controller and change, also can be specified by virtual video camera parameter generation device and change, the parameter of main virtual video camera be delivered to synthesizer and is synthesized for image rendering.
The present embodiment is prefixed multiple virtual video camera in Virtual Space, docking that on the one hand can be more level and smooth with the multiple stage real camera that may arrange in studio; On the other hand, every platform virtual video camera can use the lens parameters of different qualities, as wide-angle lens, common lens, Macro Lens can be had first-class, often kind of camera lens is different to the rendering effect of virtual scene, further increases the expressive force to virtual scene, virtual article.
Under normal circumstances, virtual studio only may be equipped with a real camera, in Virtual Space, at this moment arranges a virtual video camera can realize very easily and the coordinating and docking of true and camera.Although in theory, no matter there are how many real cameras, only have a virtual video camera just can realize docking the simulation of multiple real camera, but multiple virtual video camera is set, can the convenient locus of each real camera and the change of other parameters be followed the tracks of smoothly, to select corresponding virtual video camera in time when real camera switches.
On the other hand, even if only have a real camera, be also necessary to arrange multiple virtual video camera.As everyone knows, the camera lens specification of video camera is diversified, and wide-angle lens is good at the large scene of performance and broad picture, micro-lens to small objects to represent power stronger.The picture effect of the camera shooting Same Scene of different focal is also have different styles.In virtual environment, the virtual video camera of multiple different lens type is set, performance special screne and picture can be removed by the extraordinary camera lens of standby when program has special needs, the details of the mini Mod represented in virtual scene is such as gone with micro-lens, namely the reasonability in spatial relationship and authenticity can be kept, turn increase the rendering capability to model detail, for spectators bring good programming experience.
Embodiment four:
The present embodiment is the improvement of embodiment one, and be the refinement of embodiment one about described virtual video camera implementation, the parameter of virtual video camera comprises the parameter such as three dimensional space coordinate, Zoom, focus; Wherein the three dimensional space coordinate parameter of real camera can be used in virtual scene rationally placing the position of virtual video camera, makes virtual video camera have a fixing initial initial point.These coordinate parameters also can follow the motion of real camera in shooting process, and real-time is delivered to rendering server, and the position being used for upgrading virtual video camera is consistent with real camera with maintenance.Zoom parameter reflects the degree that widen and reduce of real camera to captured picture, and virtual video camera also needs and real camera synchronization action playing up of virtual screen, just can make finally to export the reasonable strong sense of reality of picture.Focus parameter reflects the change of real camera focal plane, also needs to convert focal plane accordingly when virtual video camera is played up.
Embodiment five:
The present embodiment is a kind of method using the virtual video camera of said system and real camera to switch.The roughly process of the present embodiment is as follows:
1, make virtual scene, the demand according to studio size and program places threedimensional model in corresponding position, and is prospect at scene middle finger which threedimensional model fixed, and which threedimensional model is background.If adopt control software design to control virtual video camera, need the movement locus making virtual video camera in scene, and specify the required time of real camera and virtual video camera conversion.
2, fix the position of real camera according to the demand of program making, and calibrate the parameter such as locality and zoom, focus of video camera at studio initial point.
3, the parameter information generating virtual video camera of parameter acquiring real camera demarcated according to the 2nd step of virtual rendering server, and play up by synthesizer the virtual scene that the 1st step makes.The threedimensional model being set as background first played up by synthesizer by virtual video camera, then on the background that the video pictures that real camera is taken is added to, played up the threedimensional model of the prospect of being set as again by virtual video camera, and the synthesis picture be added to above obtains final output picture.
4, according to the demand of program making, be switched on virtual video camera in the corresponding moment.If adopt rocking bar operation, directly press switching button, broadcast control software design if adopted, software operates switching virtual video camera.
5, after virtual rendering server receives switching command, real camera can be switched to virtual video camera.Rendering server adopts the positional information of virtual video camera, and the video pictures that real camera is taken by synthesizer projects to the assigned address under virtual video camera space again, then adopts the synthesis mode of step 3 to obtain final output picture.
If 6 adopt rocking bar to switch, the parameter of virtual video camera is identical with the parameter of real camera, just directly can be moved by operations such as shake rocking bars, rotate after switching, zoom virtual video camera, rendering server can control the speed of virtual video camera motion according to the amplitude of rocking bar.Broadcast the switching of control software design control virtual video camera if adopted, the movement locus made in step 1 moves by virtual video camera.Because the movement locus made in advance can not be consistent with current real camera parameter, rendering server can be first consistent with real camera parameter by the parameter of virtual video camera, then within the change-over time that step 1 is specified by virtual video camera smooth interpolation to the initial position made in advance, finally move along desired trajectory.
7, according to the demand of program, after virtual video camera motion terminates, can by virtual video camera switchback real camera.If adopt rocking bar to control video camera, press home button, play up video camera after receiving order, by virtual video camera from current location smooth interpolation to real camera parameter, and control the movement velocity of virtual video camera according to rocking bar shake amplitude.After virtual video camera is consistent with real camera parameter, virtual video camera adopts real camera parameter render scenes, with step 3.Control software design control virtual video camera is broadcasted if adopted, switching command is sent by broadcasting control software design, after rendering server receives order, within the change-over time that step 1 is specified, by the position of virtual video camera from current location smooth interpolation to real camera position, after virtual video camera is consistent with real camera parameter, virtual video camera adopts real camera parameter render scenes, with step 3.
The concrete steps of described method are as follows, its implementation procedure as shown in Figure 2:
The process of preparation:
Make and arrange the step of virtual scene: make virtual scene and virtual portrait and virtual article for three-dimensional animation production device, or make virtual prospect, virtual background and virtual portrait and virtual article for described prospect generating apparatus and Background generation device; Or specify virtual prospect and virtual background for described prospect generating apparatus and Background generation device according to the virtual scene that three-dimensional animation production device completes; This step is generally carried out all before play-out, and the making of three-dimensional scenic needs a large amount of time usually, but some simple animations can carry out at the scene, so that the field condition of Adaptive change.
The step of calibrating camera: for obtaining three dimensional space coordinate, Zoom, focus parameter of real camera, is sent in three-dimensional animation production device and virtual video camera parameter generation device by the three dimensional space coordinate of the real camera of acquisition, Zoom, focus parameter; This step is often carried out at the scene, also can carry out demarcation in advance, is placed on certain position determined demarcates by real camera, at the scene during recorded broadcast as required, video camera being promoted this position can switch.
The step of generating virtual video camera, for the parameter information of rendering server according to parameter acquiring real camera proven in " step of calibrating camera ", generating virtual video camera; Or the virtual environment completed according to three-dimensional animation production device generating virtual video camera is set; When there being multiple virtual video camera to exist, certain virtual video camera is specified to be current main virtual video camera by virtual video camera control device or virtual video camera parameter generation device; If there is multiple real camera, usually give different virtual video cameras respectively by the parameter of each real camera, so that corresponding virtual video camera keeps the tracking in time to real camera parameter in broadcast process.
The process broadcasted:
The step that real camera shooting is broadcasted: under operator controls, studio scene and host, welcome guest etc. are taken for real camera, and give synthesis rendering server by capture video signal by chroma key device; The parameter of real camera passes to the virtual video camera parameter generation device of synthesis rendering server in real time; The synthesis rendering server vision signal of being taken by real camera by synthesizer and prospect generating apparatus, Background generation device or synthesizer are played up after the virtual foreground picture of generation, virtual background picture, virtual portrait and virtual article picture superpose and synthesize according to real camera parameter, deliver to output device and externally broadcast; In fact, in the process that true camera shooting is broadcasted, virtual video camera is also synchronously played up, and the final picture broadcasted also is true camera shooting picture and is synthesized by the superposition of virtual video camera rendered picture.
Send real camera and switch to the step of virtual video camera instruction: for sending according to broadcast demand or scene script calls will broadcast the instruction switching to virtual video camera from real camera by synthesis rendering server or virtual video camera controller; This switching is actually relative switching, the more importantly switching of control.The emphasis switched realizes by the control of virtual video camera the control of virtual scene performance, and after switching, virtual video camera will depart from the restriction of real camera physical parameter completely, free movement in virtual environment.And in previous step, virtual video camera depends on the physical parameter motion of real camera always.According to the demand of program making, the control in the corresponding moment to video camera is switched on virtual video camera.If current employing rocking bar operation real camera, directly presses switching push button and sends switching command.If use the control of scene script current, namely current is broadcast control software design at operation real camera, then broadcast the order that control software design sends switching.The scene of the position of this process entails shot by camera is organically combined with the scene of virtual video camera institute " manufacture ".
The step of composograph: for each parameter of virtual video camera parameter generation device according to the instruction generating virtual video camera of virtual video camera controller, or virtual video camera parameter generation device is according to each parameter of the control command generating virtual video camera of the good script of pre-edit, virtual video camera receives the parameter that the transmission of virtual video camera parameter generation device comes, the instruction accepting virtual video camera parameter generation device or virtual video camera controller switches main virtual video camera, and the parameter of unique virtual video camera or main camera is sent to synthesizer, prospect generating apparatus, Background generation device plays up generating virtual foreground picture and virtual background picture according to the virtual video camera parameter obtained from synthesizer, synthesizer also independently can play up generating virtual foreground picture according to virtual video camera parameter, virtual background picture, virtual portrait and virtual article picture, the video that real camera is taken by synthesizer is played up according to virtual video camera parameter, and to playing up the real camera capture video picture of generation and virtual foreground picture, virtual background picture, virtual portrait and virtual article picture carry out superposition synthesis and export,
If adopt rocking bar to switch, the initial conditions of virtual video camera is identical with the parameter of real camera, just directly can be moved by operations such as shake rocking bars, rotate after switching, zoom virtual video camera, rendering server can control the speed of virtual video camera motion according to the amplitude of rocking bar.Broadcast the switching of control software design control virtual video camera if adopted, virtual video camera moves along the movement locus made.Because the movement locus made in advance can not be consistent with current real camera parameter, rendering server can be first consistent with real camera parameter by the parameter of virtual video camera, then within certain change-over time by virtual video camera smooth interpolation to the initial position made in advance, finally move along desired trajectory.
In the step of composograph, the control of video camera is taken as the leading factor with virtual video camera always, if be provided with multiple virtual video camera, can also switch in this process between different virtual video cameras, so that from different visual angles, with different camera lens styles performance virtual scene.
Send the step of virtual video camera switchback real camera instruction: for the demand according to program, send the instruction of virtual video camera switchback real camera; If adopt rocking bar to control video camera, press home button, send the instruction of switchback.Broadcast control software design according to script switching if adopted, broadcast the order that control software design sends switchback automatically.Use the mouse of virtual video camera controller, keyboard or touch-screen at operation virtual video camera if current, then the button that mouse, keyboard or touch-screen can be used to click on screen operates.
The step of switchback real camera: rendering server is after receiving order, controlled the direction of motion and the speed of virtual video camera according to the movement velocity of virtual video camera and curve movement by virtual video camera parameter generation device, each parameter of the real camera when virtual video camera parameter generation device in rendering server switches to virtual video camera according to real camera, by virtual video camera from parameter current smooth interpolation to real camera parameter, during smooth interpolation, keep playing up and exporting virtual scene always; After virtual video camera is consistent with real camera parameter, forward the step that real camera shooting is broadcasted to.
Finally it should be noted that, below only in order to technical scheme of the present invention to be described and unrestricted, although with reference to preferred arrangement scheme to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention (such as: the setting of each device of system, the sequencing etc. of step) or equivalent replacement, and not depart from the spirit and scope of technical solution of the present invention.Method of the present invention can work out the program for being applied to computer system, and runs in computer network system of the present invention.
Claims (6)
1. the system that switches of a virtual video camera and real camera, comprise: the real camera be connected with synthesis rendering server, described real camera is connected with chroma key device, it is characterized in that, described synthesis rendering server is connected with virtual video camera controller, the virtual video camera be connected with real camera and virtual video camera controller is provided with in described synthesis rendering server, described virtual video camera is connected with synthesizer, described synthesizer is connected with described chroma key device, the prospect generating apparatus be connected with synthesizer is also provided with in described synthesis rendering server, Background generation device and output device.
2. system according to claim 1, is characterized in that, the control peripheral hardware of described virtual video camera controller is the one in keyboard, mouse, touch-screen or rocking bar.
3. system according to claim 1, it is characterized in that, described synthesis rendering server is used for the state according to virtual video camera, virtual prospect in virtual scene, virtual background are played up picture, and carry out superposing with the picture that real camera is taken and synthesize, final synthesis picture is delivered to output device and export; Described virtual video camera controller is used for controlling that virtual video camera moves in the position in virtual environment space, the change pointed to, picture propelling zoom out and the change in location of focus; Described virtual video camera parameter generation device accepts the control command of virtual video camera controller, control command is converted to the parameter of virtual video camera, the parameter of program to virtual video camera that virtual video camera parameter generation device can also preset according to software changes and generates, virtual video camera parameter generation device by the Parameter transfer of virtual video camera to virtual video camera for follow-up; Virtual video camera Parameter transfer uses to synthesizer by described virtual video camera; Described prospect generating apparatus can create virtual prospect, also three-dimensional animation production device be can receive and virtual scene and virtual portrait made, and from virtual environment, specify virtual prospect, prospect generating apparatus obtains current virtual camera parameters by synthesizer, according to virtual video camera parameter generating virtual foreground picture; Described Background generation device can create virtual background, also three-dimensional animation production device be can receive and virtual scene and virtual portrait made, and virtual background is specified from virtual environment, Background generation device obtains current virtual camera parameters by synthesizer, according to virtual video camera parameter generating virtual background frame; Described synthesizer receives the parameter that virtual video camera transmits, the real camera shooting picture that reception chroma key device transmits and key, the picture of generating virtual foreground picture and virtual background picture and other virtual article/virtual portraits, virtual foreground picture, virtual article/virtual portrait picture, real camera shooting picture, the superposition of virtual background picture are synthesized, and are sent output device to export synthesis result by the definition according to Virtual Space; The picture that synthesizer is sent here by described output device is delivered to broadcast after completing necessary data, signal conversion and is used.
4. system according to claim 1, it is characterized in that, described virtual video camera can have one or more, one of them is as current main virtual video camera, main virtual video camera can be specified by virtual video camera controller and change, also can be specified by virtual video camera parameter generation device and change, the parameter of main virtual video camera be delivered to synthesizer and is synthesized for image rendering.
5. system according to claim 1, is characterized in that, the parameter of described virtual video camera comprises three dimensional space coordinate, Zoom, focus parameter.
6. the method using the virtual video camera of system described in claim 1 and real camera to switch, is characterized in that, the step of described method is as follows:
The process of preparation:
Make and arrange the step of virtual scene: make virtual scene and virtual portrait and virtual article for three-dimensional animation production device, or make virtual prospect, virtual background and virtual portrait and virtual article for described prospect generating apparatus and Background generation device; Or specify virtual prospect and virtual background for described prospect generating apparatus and Background generation device according to the virtual scene that three-dimensional animation production device completes;
The step of calibrating camera: for obtaining three dimensional space coordinate, Zoom, focus parameter of real camera, is sent in three-dimensional animation production device and virtual video camera parameter generation device by the three dimensional space coordinate of the real camera of acquisition, Zoom, focus parameter;
The step of generating virtual video camera, for the parameter information of rendering server according to parameter acquiring real camera proven in " step of calibrating camera ", generating virtual video camera; Or the virtual environment completed according to three-dimensional animation production device generating virtual video camera is set; When there being multiple virtual video camera to exist, certain virtual video camera is specified to be current main virtual video camera by virtual video camera control device or virtual video camera parameter generation device;
The process broadcasted:
The step that real camera shooting is broadcasted: under operator controls, studio scene and host, welcome guest are taken for real camera, and give synthesis rendering server by capture video signal by chroma key device; The parameter of real camera passes to the virtual video camera parameter generation device of synthesis rendering server in real time; The synthesis rendering server vision signal of being taken by real camera by synthesizer and prospect generating apparatus, Background generation device or synthesizer are played up after the virtual foreground picture of generation, virtual background picture, virtual portrait and virtual article picture superpose and synthesize according to real camera parameter, deliver to output device and externally broadcast;
Send real camera and switch to the step of virtual video camera instruction: for sending by synthesis rendering server or virtual video camera controller the instruction switching to virtual video camera from real camera according to broadcast demand or scene script calls;
The step of composograph: for each parameter of virtual video camera parameter generation device according to the instruction generating virtual video camera of virtual video camera controller, or virtual video camera parameter generation device is according to each parameter of the control command generating virtual video camera of the good script of pre-edit, virtual video camera receives the parameter that the transmission of virtual video camera parameter generation device comes, the instruction accepting virtual video camera parameter generation device or virtual video camera controller switches main virtual video camera, and the parameter of unique virtual video camera or main camera is sent to synthesizer, prospect generating apparatus, Background generation device plays up generating virtual foreground picture and virtual background picture according to the virtual video camera parameter obtained from synthesizer, synthesizer also independently can play up generating virtual foreground picture according to virtual video camera parameter, virtual background picture, virtual portrait and virtual article picture, the video that real camera is taken by synthesizer is played up according to virtual video camera parameter, and to playing up the real camera capture video picture of generation and virtual foreground picture, virtual background picture, virtual portrait and virtual article picture carry out superposition synthesis and export,
Send the step of virtual video camera switchback real camera instruction: for the demand according to program, send the instruction of virtual video camera switchback real camera;
The step of switchback real camera: rendering server is after receiving order, controlled the direction of motion and the speed of virtual video camera according to the movement velocity of virtual video camera and curve movement by virtual video camera parameter generation device, each parameter of the real camera when virtual video camera parameter generation device in rendering server switches to virtual video camera according to real camera, by virtual video camera from parameter current smooth interpolation to real camera parameter, during smooth interpolation, keep playing up and exporting virtual scene always; After virtual video camera is consistent with real camera parameter, forward the step that real camera shooting is broadcasted to.
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