CN101825974B - Large-breadth interactive tabletop synchronization signal acquisition system - Google Patents
Large-breadth interactive tabletop synchronization signal acquisition system Download PDFInfo
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Abstract
The invention provides a large-breadth interactive tabletop synchronization signal acquisition system, which comprises a large-breadth interactive tabletop, a master control computer, a controller, an LED array, a camera array and n signal acquisition computers, wherein the large-breadth interactive tabletop consists of n sub-tabletops; the master control computer is used for transmitting control parameters to the controller and receiving image data from the signal acquisition computers; the controller is used for synchronously controlling the LED array and the camera array according to the control parameters and/or synchronization pulse signals; the LED array comprises n LED units and is used for illuminating the large-breadth tabletop; the camera array comprises 2n cameras and is used for acquiring the image data of the large-breadth interactive tabletop and transmitting the synchronization pulse signals to the controller when a shutter of one camera is taken down; and the n signal acquisition computers are used for processing the acquired image data and transmitting the processed image data to the master control computer. The large-breadth interactive tabletop synchronization signal acquisition system meets requirements on signal acquisition of a large field of view, high brightness and wide angle of field, and keeps synchronous switches of the cameras and LEDs.
Description
Technical field
The present invention relates to the Signal Collection Technology field, particularly relate to a kind of large-breadth interactive tabletop synchronization signal acquisition system.
Background technology
In recent years, the interactive desktop technology obtains concern more and more widely, interactive desktop is given the exchange channels that harmony and natural is provided between user and the computing machine, allows one or more user directly multi-point touch control type input on the display surface of interactive desktop.The interactive signal acquisition system of robust is the prerequisite of whole mutual desktop steady operation.
In the signals collecting mode of mutual desktop, existing implementation method comprises based on the frustrated total internal reflection technology; Long limit of rectangular screen (also being interactive desktop) and minor face emission infrared signal, another long limit and minor face are installed the technology of receiving trap; The technology of infrared light supply and video camera etc. is installed simultaneously at the interactive desktop rear side.Wherein last class has adaptability widely, no matter is that finger or interaction pen or other object that contacts with the display surface of interactive desktop can be caught by video camera.
The input signal acquisition system principle of work that infrared light supply and video camera are installed simultaneously at the interactive desktop rear side is: the infrared light supply that is placed in the interactive desktop bottom sends infrared light, shine the display surface of interactive desktop equably and transmit, when desktop top have finger or other interactive device near the time, infrared light reflection that can will project is to the desktop bottom direction, the a pair of video camera that is installed in the desktop rear side is equally caught, it is exactly a series of point or zones brighter than the peripheral region that reflected light is reflected in the image, just can be pointed or the shape of interactive device through further visual processes algorithm, information such as position, software processes through the upper strata is converted to the intelligible interactive instruction of computing machine again, thereby reaches people and the direct mutual purpose of computing machine.
The interactive desktop of large format generally all is spliced by submodule, can satisfy the requirement that a plurality of users bend over one's desk working simultaneously and participate in a conference, for the man-machine interaction easily under the multi-user mode provides application platform.But in the mutual desktop of large format, single video camera of available technology adopting and single LED unit can't satisfy wide-field collection demand, also can't guarantee enough brightness of illuminations and angular field of view, for the interactively signals collecting of large format is brought limitation.
In addition, light source is in long-time illumination condition usually in the prior art, and unlatching can cause light source to produce a large amount of heats for a long time, and overlong time might burn out light source, reduces the life-span of device.Therefore, the opening time of camera shutter and the opening time of light source need be consistent, that is: when video camera array was opened the shutter photographic images simultaneously, light source igniting was also lasting or luminous in the high-frequency pulse mode, and light source stops luminous irradiation when the video camera array shutter close.In order to adapt to the application scenarios of mutual desktop complexity, acquisition system needs different screening-modes, so the method for synchronization of acquisition system should be able to be subjected to the accurate control of main control computer.
In a word, need the urgent technical matters that solves of those skilled in the art to be exactly: how can carry out signals collecting, and the switch of video camera and the switch of LED are kept synchronously at the interactive desktop of large format.
Summary of the invention
Technical matters to be solved by this invention provides a kind of interactive desktop synchronization signal acquisition system, realizes the signals collecting of large-breadth interactive tabletop, and the switch of the switch of maintenance video camera and LED is synchronous.
In order to address the above problem, the invention discloses a kind of large-breadth interactive tabletop synchronization signal acquisition system, comprising:
Large-breadth interactive tabletop is made of n piece desktop, is used for receiving and showing interactive information;
Main control computer is used for sending controlled variable to controller, and the view data of received signal collecting computer transmission;
Controller is used for when inter-sync, keeps synchronous according to the switch of the switch of controlled variable and synchronization pulse control led array illumination and video camera array shutter; When outside synchronously the time, keep synchronous according to the switch of the switch of controlled variable control led array illumination and video camera array shutter;
Led array comprises n LED unit, and each LED unit is corresponding with a sub-desktop, is used for according to the control of controller the large format desktop being thrown light on;
Video camera array comprises 2n video camera, and each is corresponding with a sub-desktop to video camera, is used for according to the control of controller large-breadth interactive tabletop being carried out image data acquiring; In a video camera pulse transmission unit is set therein, is used for when the shutter of video camera is opened, sending synchronization pulse to controller;
N signals collecting computing machine, be used for to each to camera acquisition to view data handle, and be sent to main control computer.
Preferably, described controlled variable comprises: synchronous mode, aperture time and/or image data acquiring frequency.
Preferably, described controller comprises:
Parameter acquiring unit is used for obtaining controlled variable from main control computer;
Mode determination is used for judging it is inter-sync or synchronously outer according to the synchronous mode of controlled variable;
The pulse acquiring unit is used for obtaining synchronization pulse from video camera array when inter-sync;
Synchronous control unit is used for when inter-sync, keeps synchronous according to the switch of the switch of described controlled variable and synchronization pulse control led array illumination and video camera array shutter; Perhaps, when synchronous outside, directly keep synchronous according to the switch of controlled variable control led array illumination and the switch of video camera array shutter.
Further, described synchronous control unit is controlled the unlatching that led array throws light on according to the synchronization pulse that obtains from video camera array when inter-sync, and controls closing of led array illumination according to the aperture time of the controlled variable of obtaining from main control computer.
Preferably, described synchronous control unit comprises:
Control signal generates subelement, is used for generating control signal according to controlled variable and/or synchronization pulse; Control signal sends subelement, is used for transmitting control signal to led array and/or video camera array.
Further, described each video camera comprises: fast door control unit, the shutter that is used for controlling each video camera according to default internal circuit when inter-sync opens and closes simultaneously.
Preferably, described control signal transmission subelement comprises:
Wireless transmitter module is used for by wireless mode to led array and/or video camera array output control signal; Output buffer is used for by wired mode to led array and/or video camera array output control signal.
Preferably, described led array comprises:
N first wireless receiving module is used for receiving control signal by wireless mode and sends the control signal that subelement sends, and it is transferred to the signal input part of n corresponding LED unit as the light switch signal; N first input buffer is used for receiving the control signal that the control signal transmitting element sends by wired mode, and is converted into the signal input part that the light switch signal transfers to n corresponding LED unit.
Preferably, the signal input part of described each LED unit links to each other with the grid of N channel enhancement metal-oxide-semiconductor; Described N channel enhancement metal-oxide-semiconductor produces the brightness of illumination of the adjusting LED unit of modulating pulse according to oscillator.
Preferably, described video camera array comprises:
2n second wireless receiving module is used for receiving control signal by wireless mode and sends the control signal that subelement sends, and it is transferred to the signal input part of n corresponding video camera as the shutter release signal; 2n second input buffer is used for receiving the control signal that the control signal transmitting element sends by wired mode, and is converted into the signal input part that the shutter release signal transfers to n corresponding video camera.
Compared with prior art, the present invention has the following advantages:
The present invention is shone each sub-desktop by each LED unit of led array, by each of video camera array to each corresponding view data of sub-desktop of camera acquisition, compared with signal acquiring system single led, video camera, brightness of illumination and angular field of view have been increased, increased the shooting visual field (data acquisition zone), the data that collect more comprehensively, and are more clear, the collection demand of interactive signal in the time of can satisfying mutual desktop high resolving power large format tiled display.
Simultaneously, the present invention can realize different synchronous modes, when the inter-sync, the switch of the synchronization pulse control led array illumination of obtaining according to the controlled variable of obtaining from main control computer with from video camera is synchronoused working with the switch of video camera array shutter by controller; When synchronous outside, directly control the switch of led array illumination and the switch synchronous working of video camera array shutter simultaneously according to controlled variable, middle compared to existing technology lighting source keeps continuing opening always, and the present invention can bring lower heat and electric quantity consumption.
Description of drawings
Fig. 1 is the structural drawing of a kind of large-breadth interactive tabletop synchronization signal acquisition system embodiment one of the present invention;
Fig. 2 is a large-breadth interactive tabletop synchronization signal acquisition system synoptic diagram in the embodiment of the invention one;
Fig. 3 is the structural representation of the embodiment of the invention two middle controllers;
Fig. 4 is that Fig. 4 is a led drive circuit synoptic diagram in the embodiment of the invention two;
Fig. 5 is that base 2 in the embodiment of the invention two is in the adjustable pwm wave circuit of the 1%-99% of 555 oscillators synoptic diagram;
Fig. 6 is the workflow diagram of large-breadth interactive tabletop synchronization signal acquisition system of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
With reference to Fig. 1, show the structural drawing of a kind of large-breadth interactive tabletop synchronization signal acquisition system embodiment one of the present invention, comprising:
Large-breadth interactive tabletop 11 is made of n piece desktop, is used for receiving and showing interactive information;
N signals collecting computing machine 16, be used for to each to camera acquisition to view data handle, and be sent to main control computer.
Concrete, as shown in Figure 2, be a kind of large-breadth interactive tabletop synchronization signal acquisition system synoptic diagram of the embodiment of the invention.Wherein, only provided a pair of video camera (video camera A1 151 and video camera B1152), a LED unit A1 141 corresponding relation signal and with the signal that is connected of controller 13, main control computer 12 and a signals collecting computer A 1 161, each unit can be referring to Fig. 2 with the corresponding and annexation of other devices in video camera array and the led array.
Described controller, led array, video camera array all are positioned at the below of large-breadth interactive tabletop, interactive large format desktop, the sub-desktop A1 that is equated by the n block size is spliced to sub-desktop An, and n is a setting value, with the needs of satisfied different demonstrations with mutual area.Described mutual desktop has image to show output, the display surface of simultaneously mutual desktop is again the surface of human-machine interactive information input, so, usually each sub-desktop also disposes a projector 17, referring to Fig. 2, be used for the information of main control computer is presented in the corresponding desktop scope, can be replaced by technical grade projection ray machine for realizing better tiled display effect
Below, the described a kind of large-breadth interactive tabletop synchronization signal acquisition system of the embodiment of the invention is specifically described:
At first, the controlled variable at led array 14 and video camera array 15 in described main control computer 12 is provided with, and this controlled variable is sent to controller 23.
Preferably, described controlled variable comprises: synchronous mode, aperture time and/or image data acquiring frequency.Wherein, synchronous mode comprises inter-sync and synchronously outer, inter-sync is to be finished by the synchronous electric signal of the inter-sync signal generating circuit generation of video camera, promptly when a plurality of cameras are connected on the computer, can adjust its internal circuit by software and realize taking synchronously; Outer is sync generator (being controller in embodiments of the present invention) by an outside synchronously, synchronous control signal is distributed to each video camera in the shooting unit finishes.Aperture time is the time that camera shutter is opened, and the time is once opened in LED illumination just.Image data acquiring frequency (gathering the frequency of a two field picture) is the open frequency of camera shutter, the open frequency of LED illumination just.
Described controller 13 can be a single-chip microcomputer, its respectively with array in each LED unit link to each other with video camera, according to the controlled variable of obtaining from main control computer 12, led array 14 and/or video camera array 15 are controlled, make the switch of led array illumination and the switch of video camera array shutter keep synchronously, that is: when the shutter of each video camera was opened, described each LED unit was lighted, during the shutter close of each video camera, described each LED unit extinguishes.
Wherein, be a kind of infrared LED illumination array as the led array of lighting source, total equal-sized n LED unit, A1 to LED unit, LED unit An.(general m value is 400) formed by m infrared LED in each LED unit, a sub-desktop in the corresponding large-breadth interactive tabletop in each LED unit.Described video camera array is made up of 2n thermal camera of described model unanimity, and per two video cameras are corresponding to a sub-desktop in the described interactive large format desktop.As shown in Figure 1, LED unit A1 antithetical phrase desktop A1 shines, and video camera A1 and video camera B1 are a pair of video camera, are used to catch the view data of sub-desktop A1; LED unit An antithetical phrase desktop An shines, and video camera An and video camera Bn are a pair of video camera, and be corresponding with sub-desktop An.Video camera (any one video camera in the video camera array therein, in embodiments of the present invention for video camera A1) in the pulse transmission unit is set, be used for when the shutter of video camera is opened, sending synchronization pulse to controller, also promptly when inter-sync, trigger controller by synchronization pulse the unlatching of led array illumination is controlled.
Behind the shutter opening of video camera array, because the illumination of the control led array of controller is also lighted simultaneously, can carry out the collection of view data to large-breadth interactive tabletop, each is to the image of the corresponding sub-desktop of camera acquisition, and transmit it to corresponding signal collection computing machine (as video camera A1 and video camera B 1 with image data transmission to signals collecting computer A 1), in each signals collecting computing machine respectively to handling at the view data of n sub-desktop, view data after will handling then (the touch recognition result on the sub-desktop) is sent to main control computer, in master control is calculated, each sub-desktop picture data is carried out comprehensive analysis processing, can be pointed or the shape of interactive device, information such as position, software processes through the upper strata is converted to the intelligible interactive instruction of computing machine again, thereby reaches user and the direct mutual purpose of main control computer.
In embodiments of the present invention, each LED unit by led array shines each sub-desktop, by each of video camera array to each corresponding view data of sub-desktop of camera acquisition, compared with signal acquiring system single led, video camera, brightness of illumination and angular field of view have been increased, increased the data acquisition zone, the data that collect more comprehensively, more clear, the signals collecting demand at the big visual field, high brightness, wide visual angle in the time of can satisfying mutual desktop high resolving power large format tiled display.
Further, by controller led array is synchronoused working with the switch of thermal camera array, compared to existing technology, can bring lower heat and electric quantity consumption, improved the antijamming capability of acquisition system simultaneously, in the input signal acquisition system of interactive desktop, wide application prospect has been arranged.In addition, in each signals collecting computing machine, carry out data processing respectively, compare in same computing machine and handle, the calculated amount when having reduced single treatment, the processing speed of raising by corresponding relation.
Below, a kind of large-breadth interactive tabletop synchronization signal acquisition system embodiment two of the present invention is elaborated, described system comprises:
Large-breadth interactive tabletop is made of n piece desktop, is used for receiving and showing interactive information;
Main control computer is used for sending controlled variable to controller, and the view data of received signal collecting computer transmission;
Controller is used for according to controlled variable and/or synchronization pulse is controlled the switch of led array illumination and the switch of video camera array shutter keeps synchronously;
Led array comprises n LED unit, and each LED unit is made up of a plurality of LED, is used for according to the control of controller the large format desktop being thrown light on;
Video camera array comprises 2n video camera, and each is corresponding with a sub-desktop to video camera, is used for according to the control of controller large-breadth interactive tabletop being carried out image data acquiring; In a video camera pulse transmission unit is set therein, is used for when the shutter of video camera is opened, sending synchronization pulse to controller;
N signals collecting computing machine, be used for to each to camera acquisition to view data handle, and be sent to main control computer.
Concrete, described each video camera comprises: fast door control unit, the shutter that is used for controlling each video camera according to default internal circuit when inter-sync opens and closes simultaneously.
Be provided with the chip of serial ports level shifting circuit and/or support usb protocol in the described controller, controller can link to each other with main control computer by serial ports or USB interface, obtains the controlled variable that comprises synchronous mode, aperture time and/or image data acquiring frequency.Further, referring to Fig. 3, be the structural representation of the embodiment of the invention two middle controllers, described controller comprises:
Further, described synchronous control unit 304 is when inter-sync, control the unlatching that led array throws light on according to the synchronization pulse that obtains from video camera array, and control closing of led array illumination according to the aperture time of the controlled variable of obtaining from main control computer.
Promptly under inter-sync situation, the controlled variable of main control computer setting comprises aperture time, and do not need the image data acquiring frequency, described image data acquiring frequency is controlled by the fast door control unit internal circuit of video camera, the synchronization pulse of video camera array, just the unlatching to the led array illumination triggers, simultaneously, synchronous control unit 304 is according to the lighting hours of aperture time control led array illumination, the also close moment of promptly throwing light on.
Concrete, described synchronous control unit 304 comprises:
Control signal generates subelement 3041, is used for generating control signal according to controlled variable and/or synchronization pulse; General, by the control signal of TTL logical circuit generation Transistor-Transistor Logic level.
Control signal sends subelement 3042, is used for transmitting control signal to led array and/or video camera array.
In a preferred embodiment of the invention, described control signal transmitting element 3042 comprises:
Wireless transmitter module is used for by wireless mode to led array and/or video camera array output control signal;
The output buffer module is used for by wired mode to led array and/or video camera array output control signal.
Wireless transmitter module is mainly used in the controlled in wireless mode, and the method can reduce wiring, simplifies the structure of mutual desktop; The output buffer module is mainly used in wired control mode, and the method is reliable more accurately, this kind mode at first when mutual desktop has the wiring of well-to-do space.
Accordingly, described led array comprises:
N first wireless receiving module is used for receiving the control signal that wireless transmitter module sends by wireless mode, and it is transferred to the signal input part of n corresponding LED unit as the light switch signal;
N the first input buffering module is used for receiving the control signal that the output buffer cell sends by wired mode, and is converted into the signal input part that the light switch signal transfers to n corresponding LED unit.
Promptly first wireless receiving module or the first input buffering module can receive the control signal that controller sends by wireless or wired mode, and change them light on and off of light switch signal controlling LED into, each LED of led array lighted when camera shutter was opened, and each LED extinguished when camera shutter was closed.
Preferably, the signal input part of described each LED unit links to each other with the grid of N channel enhancement metal-oxide-semiconductor; Described N channel enhancement metal-oxide-semiconductor is according to the brightness of illumination of the adjusting LED unit of the modulating pulse of oscillator generation.
By described N channel enhancement metal-oxide-semiconductor, can improve the response time of LED illumination action, relay commonly used in the prior art, the response time of action can be brought up to the microsecond level from Millisecond.In specific embodiments of the invention, led drive circuit adopts N channel enhancement metal-oxide-semiconductor, can be by the electric current of number peace to tens of peaces, satisfy the electric current demand of LED, simultaneously for accurate adjustable brightness, adopt 555 oscillators to produce high frequency pwm (the PulseWidth Modulation of the 100kHz of 1%-99% EDM Generator of Adjustable Duty Ratio, pulse-length modulation) ripple is done logic and operation with the control signal that the controller that receives sends, obtain final LED brightness control signal, can when realization brightness is accurately adjustable, satisfy the demand of synchro switch control, circuit such as accompanying drawing 4, shown in 5.Wherein, Fig. 4 is a led drive circuit synoptic diagram in the embodiment of the invention two; Fig. 5 is the adjustable pwm wave circuit of the 1%-99% based on 555 an oscillators of the present invention synoptic diagram.
Accordingly, described video camera array comprises:
2n second wireless receiving module is used for receiving the control signal that the control signal transmitting element sends by wireless mode, and it is transferred to the signal input part of n corresponding video camera as the shutter release signal;
2n second input buffer is used for receiving the control signal that the control signal transmitting element sends by wired mode, and is converted into the signal input part that the shutter release signal transfers to n corresponding video camera.
When described thermal camera is operated in External synchronization mode, second wireless receiving module or the second input buffering module can receive the control signal that controller sends by wireless or wired mode, and change it shutter of shutter release signal controlling video camera into, this shutter release signal and the light switch signal Synchronization that changes by control signal.
When video camera array is operated in the inter-sync pattern, because the synchronizing signal that the synchronous working of video camera array mainly relies on default internal circuit to produce, and (during shutter opening) all can export a synchronization pulse when taking each two field picture, therefore controller is not to the video camera array synchro control, opposite, with the synchronization pulse of any one video camera and export the input port of controller to by wired mode, the relevant controlling parameters that controller provides according to this synchronization pulse and main control computer computing machine, produce the control signal of LED synchronously and be sent to led array, thereby can both accurately control video camera and the synchronous purpose of LED under the various synchronization mechanisms being implemented in.
Need to prove that to obtain the time of the synchronization pulse of video camera be the microsecond level to controller during inter-sync, and shutter opening time and illumination opening time are Millisecond, therefore, do not influence video camera array and led array synchronously.
In addition, adopt the conversion of wireless transmission method undesired signal, the direct control signal that the wireless transmitter module of controller is sent is as light switch signal and/or shutter release signal.Adopt wire transmission mode, then need conversion of signals that the control signal that the output buffer module sends is carried out in the first input buffering module and/or the second input buffering module, specifically comprise: level conversion is a Transistor-Transistor Logic level with the RS232 level conversion that receives for example; Signal amplifies, and the signal that weakens in the transmission course is amplified; Then control signal generates light switch signal or shutter release signal the most at last.
In specific embodiments of the invention, led array is made of 8 LED unit; Video camera array is made up of the FFMV series infrared camera of 16 PointGrey companies; Controller is an Atmega8 single-chip microcomputer, it comprises: peripheral circuit, USB interface (link to each other with main control computer, the USB interface chip adopts FT245BM), control signal generative circuit (generating the Transistor-Transistor Logic level control signal), max232 module (promptly export buffer module, be used for the Transistor-Transistor Logic level control signal and convert the RS232 level to and transfer out) and radio receiving transmitting module (can form) by PT2262/2272 and J04V/F05P.Whole mutual desktop is spliced by 8 big little identical sub-desktops, there are 1 group of LED unit and 2 video cameras in each sub-desktop inside, it (also is the first or second input buffering module that each LED unit and each video camera are equipped with wireless receiving module and max232 level switch module respectively, be used for the control signal of RS232 level is converted to the Transistor-Transistor Logic level signal), led array is placed near the projector (wherein corresponding projector of each sub-desktop), exceed not block projecting light path, infrared light is radiated at equably on the display surface of interactive desktop, every pair of video camera symmetry be placed on the projector both sides, be responsible for taking synchronously the view data of corresponding sub-desktop, catch the interactive signal of importing by the contact of finger or object on the sub-desktop, after each signals collecting computing machine carries out data processing to corresponding view data, be sent to main control computer, by on main control computer, carrying out the input signal that information fusion is determined whole mutual desktop.
In the prototype that realizes of the present invention, detail parameters is as follows: the long 1000mm of sub-desktop, high 800mm, wide 750mm, and a built-in 3M SCP720 projector, display resolution is 1024x768; Spliced desktop length is 4000mm, high 800mm, wide 1500mm; Each led array for the 880nm angle of divergence is that 80 ° LED (model is SFH485P) constitutes, is 50% of a center intensity ± 40 ° of exposure intensities of locating by 400 wavelength, and total luminous power is 80W; The highest acquisition frame rate of separate unit video camera is 60fps, and ultimate resolution is 640x480, by the computing machine of 8 gray level images of 1394b output to responsible signals collecting; The significantly desktop of 8 sub-desktop splicings is equipped with a main control computer, is responsible for showing output and translation interactive instruction; Be responsible for signals collecting and pretreated computing machine in every estrade desktop and calculate wherein luminous point, pass through LAN and export main control computer to by vision algorithm; The model of main control computer is CPU Intel Duo E7400, internal memory 4G, and hard disk 500G, video card are Geforce9600GT, and high-resolution output can be provided, and its operating system is Windows XP Pro; Main control computer links to each other with single-chip microcomputer by serial ports, single-chip microcomputer links to each other (when being mainly used in inter-sync with the synchronizing pulse output terminal of wherein a video camera, the generation of control signal), and by max232 module and wireless module send a control signal to video camera array and led array.Native system can be controlled accurately that video camera and led array are taken synchronously and change synchronous control signal to realize different synchronization mechanisms according to the demand of main control computer.
According to the described synchronization signal acquisition system of the above embodiment of the present invention, below the corresponding synchronous signal acquisition method is described, with reference to Fig. 6, the workflow diagram for large-breadth interactive tabletop synchronization signal acquisition system of the present invention comprises:
Step 601, main control computer sends controlled variable to controller;
Step 602, controller judges it is inter-sync or outer synchronous according to the controlled variable of obtaining from main control computer; If inter-sync, then execution in step 602 back execution in step 604; If outer synchronously, execution in step 603 back execution in step 604 then;
Step 603, controller obtains synchronization pulse from video camera array, keeps synchronous according to the switch of the switch of described control signal and synchronization pulse control led array illumination and video camera array shutter;
Step 604, controller directly keep synchronously according to the switch of controlled variable control led array illumination and the switch of video camera array shutter;
Step 605, the image data transmission that described video camera array will collect at the large format desktop be to each signals collecting computing machine,
Step 606, each signals collecting computing machine are sent to main control computer after view data is handled.
The input signal synchronous acquisition system that the embodiment of the invention proposes based on infrared photography head array and infrared LED array of source, can realize different synchronization mechanism (inter-sync or synchronously outer), and can change between different synchronization mechanisms according to actual needs: an infrared LED array with high divergence and the video camera that is operated in same infrared band all are placed in the bottom of interactive desktop, can photograph finger on the display surface of interactive desktop or lighted region that other object produced; Controller is undertaken alternately by serial ports or USB mouth and main control computer, to determine synchronous mode, after determining synchronous mode, control signal is sent to led array and/or video camera array, thereby accurately control the synchronous shooting of acquisition system by wireless or wired mode.It is easy that the method advantage that the present invention proposes is that system sets up, and flexibility and reliability is low in energy consumption, take up room little and input signal clear accurately, the man-machine interaction that can be pin-point accuracy on the mutual desktop provides reliable hardware foundation.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
More than to a kind of large-breadth interactive tabletop synchronization signal acquisition system provided by the present invention, be described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a large-breadth interactive tabletop synchronization signal acquisition system is characterized in that, comprising:
Large-breadth interactive tabletop is made of n piece desktop, is used for receiving and showing interactive information;
Main control computer is used for sending controlled variable to controller, and the view data of received signal collecting computer transmission;
Controller is used for when inter-sync, keeps synchronous according to the switch of the switch of controlled variable and synchronization pulse control led array illumination and video camera array shutter; When outside synchronously the time, keep synchronous according to the switch of the switch of controlled variable control led array illumination and video camera array shutter;
Led array comprises n LED unit, and each LED unit is corresponding with a sub-desktop, is used for according to the control of controller the large format desktop being thrown light on;
Video camera array comprises 2n video camera, and each is corresponding with a sub-desktop to video camera, is used for according to the control of controller large-breadth interactive tabletop being carried out image data acquiring; In a video camera pulse transmission unit is set therein, is used for when the shutter of video camera is opened, sending synchronization pulse to controller;
N signals collecting computing machine, be used for to each to camera acquisition to view data handle, and be sent to main control computer.
2. the system as claimed in claim 1 is characterized in that,
Described controlled variable comprises: synchronous mode, aperture time and/or image data acquiring frequency.
3. system as claimed in claim 2 is characterized in that, described controller comprises:
Parameter acquiring unit is used for obtaining controlled variable from main control computer;
Mode determination is used for judging it is inter-sync or synchronously outer according to the synchronous mode of controlled variable;
The pulse acquiring unit is used for obtaining synchronization pulse from video camera array when inter-sync;
Synchronous control unit is used for when inter-sync, keeps synchronous according to the switch of the switch of described controlled variable and synchronization pulse control led array illumination and video camera array shutter; Perhaps, when synchronous outside, directly keep synchronous according to the switch of controlled variable control led array illumination and the switch of video camera array shutter.
4. system as claimed in claim 3 is characterized in that,
Described synchronous control unit is controlled the unlatching that led array throws light on according to the synchronization pulse that obtains from video camera array when inter-sync, and controls closing of led array illumination according to the aperture time of the controlled variable of obtaining from main control computer.
5. system as claimed in claim 4 is characterized in that, described synchronous control unit comprises:
Control signal generates subelement, is used for generating control signal according to controlled variable and/or synchronization pulse;
Control signal sends subelement, is used for transmitting control signal to led array and/or video camera array.
6. system as claimed in claim 3 is characterized in that, described each video camera comprises:
Fast door control unit, the shutter that is used for controlling each video camera according to default internal circuit when inter-sync opens and closes simultaneously.
7. system as claimed in claim 5 is characterized in that, described control signal sends subelement and comprises:
Wireless transmitter module is used for by wireless mode to led array and/or video camera array output control signal;
Output buffer is used for by wired mode to led array and/or video camera array output control signal.
8. system as claimed in claim 7 is characterized in that, described led array comprises:
N first wireless receiving module is used for receiving control signal by wireless mode and sends the control signal that subelement sends, and it is transferred to the signal input part of n corresponding LED unit as the light switch signal;
N first input buffer is used for receiving the control signal that the control signal transmitting element sends by wired mode, and is converted into the signal input part that the light switch signal transfers to n corresponding LED unit.
9. system as claimed in claim 8 is characterized in that,
The signal input part of described each LED unit links to each other with the grid of N channel enhancement metal-oxide-semiconductor;
The brightness of illumination of LED unit is regulated in the modulating pulse that described N channel enhancement metal-oxide-semiconductor produces according to oscillator.
10. system as claimed in claim 8 is characterized in that, described video camera array comprises:
2n second wireless receiving module is used for receiving control signal by wireless mode and sends the control signal that subelement sends, and it is transferred to the signal input part of n corresponding video camera as the shutter release signal;
2n second input buffer is used for receiving the control signal that the control signal transmitting element sends by wired mode, and is converted into the signal input part that the shutter release signal transfers to n corresponding video camera.
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| CN108012377B (en) * | 2017-12-19 | 2023-08-29 | 深圳科宏健半导体照明有限公司 | Explosion-proof portable lamp and control system and method for explosion-proof portable lamp |
| CN110109635A (en) * | 2019-04-26 | 2019-08-09 | 广州视源电子科技股份有限公司 | Screen-projection display table, screen-projection display method, screen-projection display device, controller, equipment and medium |
| CN113301220B (en) * | 2021-04-27 | 2024-01-05 | 上海欧菲智能车联科技有限公司 | Synchronization method of vehicle-mounted camera and car lamp and FPGA chip |
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