CN102147683A - High-performance interactive electronic whiteboard based on bionic principle - Google Patents
High-performance interactive electronic whiteboard based on bionic principle Download PDFInfo
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Abstract
The invention provides a high-performance interactive electronic whiteboard control system based on the bionic principle. The control system has the characteristics that a dot signal source on a pen point of a writing pen sends two types of dynamic modulating signals, wherein the dynamic modeling signals comprise a low frequency flicker writing signal capable of controlling the frame frequency synchronism of a camera and a high frequency modulating signal realizing the function control. The low frequency flicker writing signal controls the camera to collect a specific video sequence image which is used for generating a bionic sequence image. A bionic multilayer digital image structure and a bionic image processing analytic algorithm can be utilized for accurately, reliably, rapidly and conveniently tracking and processing the positional information of the pen point of the writing pen. A function control signal modulated by high frequency in the writing pen is demodulated; and various complex function controls can be realized, and the high-performance interactive electronic whiteboard can be supported by utilizing the demodulation information and through the existing hardware resource of the interactive electronic whiteboard based on the bionic principle.
Description
Technical field
The present invention relates to the interactive electric whiteboard technology, particularly a kind of providing based on bionics principle high-performance electronic white board interactive system, two classes are sent in the dot signal source on the lettering pen nib can carry out modulation intelligence dynamically.Wherein a class is that low frequency flicker is write signal, and it supports that this system can follow the tracks of processing to the lettering pen pen tip position information very accurately, reliably, fast and easily based on bionics multilayer digital picture structure and bionics image processing algorithm.Another kind of is the modulation signal that high frequency contains control information, and this class modulation intelligence is carried out demodulation, and with the control information of these demodulation some specific functions is controlled.
Background technology
Interactive electric whiteboard is the auxiliary human-computer interaction device of a kind of advanced person's education or meeting, and it can cooperate instruments such as projector, computer, realizes dust-free writing, arbitrarily writes, function such as long-range interchange.From hardware principle, interactive electric whiteboard has merged large screen projection technology, pinpoint measuring technology etc.On the International or National market of present stage, have multiple technologies can realize that electronic whiteboard accurately locatees, representative is technology such as electromagnetic induction, linear array infrared ray, resistance, ultrasound wave, one dimension CCD, two-dimensional infrared video camera.Every kind of technology all has different characteristics and advantage.
The problem of electromagnetic induction, linear array infrared ray, resistance, ultrasound wave and one dimension CCD technology maximum is to use by they corresponding separately principles makes special screen, has brought the problems such as inconvenient, difficult in maintenance, on the high side of using like this.At present the most promising is the two-dimensional infrared camcorder technology.It can be as long as just can realize real man-machine interaction with an infrared pen on the projection screen of any medium even white wall.
There is a common problem in existing two-dimensional infrared photography machine technology, be exactly that the lettering pen of these technology only uses static infrared control signal (the contact blank is opened often, leaving blank closes often), so not only waste energy, shorten the power using time in the lettering pen, the more important thing is the Flame Image Process difficulty simultaneously, the processing time is long, and functional reliability is poor.
Existing technology itself can only realize between target (lettering pen) and the computing machine from motion tracking, and can't realize the communication of control information between target and the computing machine, control information is the switching of Control work pattern, the left button of analog mouse or right button once reach secondary button (Clickand Double Click), the focusing of remote control adjustment projector, functions such as ON/OFF projector.Though some product can be used other ancillary techniques and realize the control information communication chatted, as blue tooth radio communication etc., increased the cost of product like this, increased the possible breakdown rate, give simultaneously and use and keep in repair and also brought a lot of difficulties.
What existing interactive electric whiteboard was adopted is the two-dimensional infrared camcorder technology.The two-dimensional infrared camcorder technology can suppress the ground unrest that part is formed by visible light to a certain extent, also suppressed simultaneously the human figure information that mainly forms by visible light, giving very has the use prospect, controls whiteboard system with appearance body language message and brings huge difficulty.
Summary of the invention
Biology is especially human in the evolution of long period of time evolution, and the 26S Proteasome Structure and Function of various organs is more and more perfect.By research to the 26S Proteasome Structure and Function of biologic-organ, much useful inspirations are provided can for the development of science and technology and engineering, bionics is exactly a special subject that develops therefrom.
Human eye-brain is FA system, and at present people are also very unclear to its principle, in fact, no matter is from microcosmic (anatomical features) or macroscopic view (psychological characteristics) angle, humanly can't explain that also the human visual system's is efficient and magical.These characteristics of simulation human eye have become a research focus in the current computer vision field.
Though people also can't explain human visual system's detailed principle at present, but have any to affirm, what human eye was seen is not to be that the people is concerned about all.Useful visual information only is distributed in certain spatial dimension and the regular hour section usually, so human vision neither all equally arouse attention to all parts in the scene, but have as required by different level, selectively a part is wherein noted especially, be general observation or ignore for other parts.Go for a people such as you to the square, a lot of people are arranged on the square, you are impossible, also have no time to go a people one carefully to go identification corporally.But scan roughly earlier with eyes, find that earlier those may be the people that you look for, or claim relatively as people (Candidate), then to these relatively as the people carefully discern again.The identification of just saying the people is stratified, earlier at wide viewing angle, on a large scale under the situation, in low level (the big visual field, low resolution) discerns roughly in, under the state of watching attentively, the irrelevant information around the target is ignored in a large number then, on high-level (low coverage, high resolving power), accurately discern.
People and biological eyes more can arouse attention than static state to dynamic object.Younger brother such as you meets you to the airport, when you one go out the airport, sees that there are a lot of people that receive lodgers the outside, and you are difficult in the younger brother who finds you in large numbers of crowds.When your younger brother again and again when you wave, you just find than being easier to.The biologist is by studies have shown that, a small worm is parked in the next door of frog still, though very near from this frog, but frog also is difficult to find it.If there is a small worm flying, even from the distant place of frog, this frog also can be found it and jump up he is captured soon.This technology broadly is applied in the engineering, such as the lamp that the anti-aircraft collision of flicker all will be installed on the top of the high-lager building in city, though be the ocean of a slice lights evening in the city, the pilot is easy to notice soon the anticollision beacon that glimmers on the high building in the ocean of a slice lights.In order to attract much attention, the automobile turning pilot lamp is designed to be flicker, and the warning lamp on the police car top also is designed to red, blue alternately flicker.
Video is that (z) (t), this class image is called as video image to pairing another kind of 3-D view f to the three-dimensional image f that is familiar with people for x, y for x, y.From the expression and the storage organization of computer-internal, this two classes image is similar.But expressed from them and describe scene content, this two classes image has very big difference.F (x, y z) givenly remain the extension of static scenery in the space, and f (x, y, t) reflection be motion scenery over time.The emphasis that video calculates (Video Computing) research is exactly how to come event in scenery and the scene is analyzed and studied with movable information.Video calculates and also to be widely used in recent years, considerable be well solved with the use of the insoluble problem of rest image by video originally.The present invention is from bionics principle, and video computing technique and information modulation technique are combined effectively.
The present invention refers to interactive electric whiteboard system this based on the Flame Image Process of computer vision feature and the bionics principle of image understanding.
In present interactive electric whiteboard prior art, the problem of electromagnetic induction, linear array infrared ray, resistance, ultrasound wave and one dimension CCD technology maximum is to use by the special screen of they corresponding separately principle making and positions writing nib, so do not relate to the collection of two-dimensional digital image, Flame Image Process and image understanding technology.Because it is backward in technique that they use, need the electronic whiteboard of special construction, the cost height uses inconvenience, also has a lot of problems simultaneously, progressively eliminates at present.Have only the two-dimensional infrared camcorder technology to relate to collection, Flame Image Process and the image understanding technology of two-dimensional digital image.It can be as long as just can realize real man-machine interaction with an infrared pen on the projection screen of any medium even white wall, its advanced technology, and use is flexible, obtains application more and more widely.The present invention uses the difference of two-dimensional infrared camcorder technology interactive electric whiteboard maximum to be the two dimensional image receiving element with tradition and writes the spectral range of the light-emitting component of nib, the character of the signal that the light-emitting component of nib sends, and the mode of Flame Image Process and graphical analysis.Two dimensional image receiving element that conventional two-dimensional infrared photography machine technology uses and the frequency spectrum of writing the light-emitting component of nib must be infrared lights, and what write that the light-emitting component of nib produces is stationary singnal.Its objective is that the responsive especially principle of only light-emitting component of writing nib being sent with infrared two dimensional image receiving element of infrared light give prominence to the infrared signal on the lettering pen nib, the background signal that inhibition is made up of visible light.Background signal also might comprise a large amount of infrared informations in fact, can suppress certain ground unrest with infrared technique, but effect is very not desirable sometimes.Conventional two-dimensional infrared photography machine technology very big defective is the human visual information that it has suppressed to be made up of visible light simultaneously in addition, and giving very has the use prospect, controls whiteboard system with appearance body language message and brings huge difficulty.The spectral range of the two dimensional image receiving element that characteristics of the present invention are to use and the light-emitting component of lettering pen nib is very wide, it can be an infrared light, it also can be any visible light, ultraviolet light, electromagnetic wave, ultrasound wave or laser beam, using another fringe benefit of laser beam is the function that lettering pen also has laser pointer.Signal on the lettering pen nib is not a stationary singnal, but the Dynamic Signal that can modulate.It is not to rely on infrared two dimensional image receiving element the responsive especially principle of infrared light to be suppressed the background signal of being made up of visible light, useful visual information extracts effectively in certain spatial dimension and the regular hour section being distributed in but with bionics principle, reliably, suppress ground unrest significantly.Here defined useful visual information is meant the trace information of lettering pen pen tip position.Because the present invention can use visible light camera, the image human figure is clear, gives with the control of appearance body language message and has created condition.
Chatting purpose on of the present invention realizes by following technical scheme:
Based on bionics principle high-performance interactive electric whiteboard system is by adjustable system lettering pen, video camera, and video camera control and analog to digital conversion, the modulation signal receptacle, the modulation signal control system, microprocessing systems, computing machine and projector are formed, and it is characterized in that:
A. adjustable system lettering pen and control system may command lettering pen nib dot signal source thereof produce low frequency flicker and write signal or high frequency modulated function control signal, to produce the bionics image sequence and to realize control function;
B. modulation signal is accepted and control system, and it is by the modulation signal receptacle, considers the ripple device by low pass, and signal amplification/shaping produces frame synchronizing signal, and by high-pass filter, the control signal detuner extracts control signal;
C. form two dimensional image collection and control system thereof by video camera, camera control section, high-speed a/d converter, it produces special video digital images signal;
D. Flame Image Process and analytic system thereof are by bionics multilayer digital picture structure, and bionics image processing and analyzing algorithm is formed, and handle to realize high speed image, extract high-quality target signature;
The present invention has two kinds of mode of operations.In the mode of operation 1, Flame Image Process and analytic system thereof are by independently microprocessing systems execution.In the mode of operation 2, Flame Image Process and analytic system thereof are to be finished by the software in the computing machine.
Embodiments of the invention are described further in conjunction with the accompanying drawings.
Fig. 1 is a bionics principle interactive electric whiteboard block diagram;
Fig. 2 is adjustable system lettering pen and control system block diagram thereof;
Fig. 3 is systemic-function control block diagram;
Fig. 4 is a bionics multilayer digital picture structural drawing;
Fig. 5 is bionics image processing algorithm principle and design sketch thereof;
Fig. 6 writes flash signal and frame synchronizing signal oscillogram for low frequency;
Fig. 7 is for realizing block diagram with bionics image processing algorithm hardware
Based on the course of work of bionics principle high-performance interactive electric whiteboard by shown in Figure 1, projector 4 the image projection on the screen of computing machine 5 to blank.When adjustable system lettering pen 1 was pressed on blank, the dot signal source on the adjustable system lettering pen nib was sent low frequency and is write flash signal.Modulation signal receptacle 8 receives the dot signal source and sends flicker and write signal, extracts the frame synchronization control signal by modulation signal control system 7, carries out continuous correction by the frame synchronization of video camera control and 3 pairs of video cameras of mould/number conversion.Video camera 2 also receives the image that signal is write in the flicker that includes adjustable system lettering pen 1 simultaneously, with the control of frame synchronization control signal under can guarantee to make a video recording the function timed delivery for the bright/dark signal image that collects on the adjustable system lettering pen 1.When the function key of pressing on the adjustable system lettering pen, the high frequency modulated control signal is sent in dot signal source on the adjustable system lettering pen nib, the modulation signal receptacle receives the control signal of high frequency modulated, extract control signal by modulation signal control system 7, carry out the control corresponding function by microprocessing systems 6.Microprocessing systems also plays the work functions of coherent system each several part simultaneously.In mode of operation 1, microprocessing systems also is responsible for generating bionics multilayer digital picture structure and carrying out the bionics image processing algorithm.Microprocessing systems is also carried out and the computing machine communication function, and control computer is carried out corresponding mouse, keyboard control function.
The course of work of adjustable system lettering pen and control system thereof is by shown in Figure 2, and adjustable system lettering pen is to write nib 10 and a lettering pen body constitutes by scalable.Dot signal source 11 is installed in can write the nib front portion, and the scalable at ordinary times nib of writing ejects the state of stretching out that is in to it by flexible member.When lettering pen nib contact blank, the scalable nib of writing is shunk in a lettering pen body, when scalable writing produces micro displacement when nib is shunk, triggers style of writing sensor 17.When the style of writing working sensor, go to control the point-like signal source by the low-frequency modulation signal in the 12 call signal modulating systems 13 of signal controlling processing section, control the point-like signal source and send the synchronous low frequency of may command video camera frame frequency and write signal this moment, supports to realize the bionics principle Flame Image Process thus.Optimal camera frame synchronizing signal is to keep same frequency with the power supply of AC network, same-phase, thus also can be with the interior built-in aerial of a bit of lettering pen, the AC network signal of receiving space goes the control frame synchronizing signal.Function control key groups 16 is mounted in a lettering pen body operating personnel and points operating position as snug as a bug in a rug, to realize the control of various functions, switch as duty, the right button of the left button of analog mouse, mouse, ON/OFF projector, control projector are focused etc.When a certain function key was pressed, function key was sent corresponding high-frequency modulation signal by signal controlling part 12 control signal modulating systems 13, sent by being installed in the procephalic dot signal of lettering pen source.This control model and televisor, telepilots such as air-conditioning are identical, therefore have a lot of existing control communications protocol and dedicated IC chip to select for use.After in case high precision crystal oscillator clock signal 14 guarantees frame synchronizing signal and camera frame signal Synchronization in the lettering pens, later on all the time with its maintenance synchronous regime, or only carry out very small adjustment.Power unit is made up of battery, because dot signal of the present invention source the time glimmers in work, so can save the energy of battery significantly than existing lettering pen, prolongs the serviceable life of battery significantly.
The systemic-function control procedure as shown in Figure 3, projector 4 the image projection on computing machine 5 screens on blank.The two dimensional image that video camera 2 is thrown projector on blank is gathered continuously, and by high speed A device 22 camera acquisition to analog quantity be transformed into and constitute special picture structure by the bionics requirement behind the digital quantity and be stored in the image memory.Simultaneous camera 2 is subjected to camera control section 24 controls, camera control section is by frame synchronizing signal 25 controls that modulation signal is accepted and control system is sent, to guarantee that writing the anterior dot signal source flash signal of nib keeps good synchronous regime with video camera all the time.
Modulation signal receptacle 9 receptacles are accepted by writing the various signals that send in the anterior dot signal source of nib.The signal that send in lettering pen dot signal source can be divided into two big classes, and a class is that signal is write in the flicker of low frequency, and it keeps synchronous with the video camera frame frequency, the main generation bionics image sequence of supporting.Another kind of is high frequency, and function control modulation signal is to carry out the control function of various complexity.Because this two classes signal frequency differs greatly, so can separate them easily by considering the ripple device.Can write signal extraction to low frequency flicker by low pass worry ripple device 29 and come out,, and produce the frame synchronizing signal that frame synchronizing signal 25 is removed the correcting camera control section thus by signal amplification/shaping 27.Video camera 2 under the control of frame synchronizing signal, can accurately replace picked-up comprise lettering pen dot signal source bright/dark image, to obtain the tip of stylus motion track signal of high-resolution with bionics Flame Image Process principle.Can separate the high-frequency controling signal of modulation again with high-pass filter 29,, translate control signal corresponding and go to carry out or control relative function by control signal detuner 28.Frame synchronizing signal in camera control section 24 is to be produced by high-precision crystal oscillator clock signal 26, also constantly use simultaneously and consider the ripple device 29 dot signal source synchronizing signals with lettering pen that extract by low pass and carry out dynamic calibration, guarantee that from two aspects the camera frame synchronizing signal writes signal with the lettering pen low frequency flicker all the time and keep synchronously.
Flame Image Process and analytic system thereof are by bionics multilayer digital picture structure, and the bionics image processing algorithm is formed.
Bionics multilayer digital picture structure be a kind of special pyramid picture structure as shown in Figure 4.Tomographic image 31 is by low resolution on the position, and decimal group image is formed, and position lower image 32 is by high resolving power, big array image construction.The upper strata is that compression by a certain percentage forms from lower image, and with lower image strict position corresponding relation is arranged.The bionics image analysis process is to find roughly in last tomographic image 31 earlier and location lettering pen light spot position 31b, because last tomographic image is made up of decimal group image, so can find out the Position Approximate of lettering pen luminous point very fast, quite with human eye at wide viewing angle, discern roughly under the large-scale situation.And then handle is hinted obliquely at the corresponding interval 32b of the pyramidal lower image of digital picture at the Position Approximate 31b of the lettering pen nib of last tomographic image 31 discoveries.Lower image 32 is high resolving power, big array image, owing to found the Position Approximate of lettering pen luminous point on the upper strata, this Position Approximate is projected to lower image, accurately the lettering pen luminous point is located in the 32b so need only between projection in zone very little in lower image 32, can obtain the point-device result of luminous point on the lettering pen nib very soon.Suitable and human eye is accurately discerned in (between very little projection in zone) under the state of watching attentively.Because need in the big array image of lower floor, not carry out time-consuming Flame Image Process in large area, being equivalent to human eye ignores in a large number to the irrelevant information around the target, so can save a large amount of processing times, make the Flame Image Process of this system realize the effect that near real time is handled.
The image of supposing the present frame that lettering pen is dark is [Tt] and to contain the bright previous frame image of lettering pen be [Tt-1].
The bionics image processing algorithm is containing the dark current frame image of lettering pen [Tt] and containing the bright previous frame image [Tt-1] of lettering pen, this two two field picture carries out promptly obtaining bionics current frame image [St] after the image subtraction process, and the following institute of image subtraction process is chatted.
The image subtraction process:
The width of definition image: W
The height of definition image: H
Image [Tt] is at coordinate x, y, the pixel value on the t point: T (x, y, t)
Image [Tt+1] is at coordinate x, y, the pixel value on the t-1 point: T (x, y, t-1)
Image [St] is at coordinate x, y, the pixel value on the t point: S (x, y, t)
The mathematic(al) representation of image subtraction process is:
S(x，y，t)＝|T(x，y，t)-T(x，y，t-1)|
| (x＝0，1，2，…，W-2，W-1)
(y＝0，1，2，…，H-2，H-1)
(t＝…，n，n+1，…，n+m-1，n+m，…)
(wherein n, m is a positive integer),
The principle of bionics image processing algorithm and treatment effect thereof are by shown in Figure 5, image 41 is the dark images of simulation lettering pen, image 42 is the bright images of simulation lettering pen, at the sparklet 42b on the image 42 is the luminous point of simulating on the tip of stylus, because image background is very complicated, be difficult to conventional image processing algorithm extracting at image 42 medium and small round spot 42b.The bionics image processing algorithm carries out the image subtraction process to dark image 41 image 42 bright with simulating lettering pen of simulation lettering pen, obtain carrying out binary conversion treatment again behind the bionics image, obtain the actual effect of the bionics Flame Image Process simulated with computing machine in the image 43, the little round spot signal in the result image on the lettering pen nib becomes very strong.This can be interpreted as also what frog be difficult to be found static object and to the highstrung reason of dynamic object.
Because writing the frame synchronization system of signal and video camera, lettering pen low frequency flicker of the present invention can guarantee that video camera and lettering pen flicker keep very high synchronized relation.Bionics image processing algorithm of the present invention is all the time, continuously image adjacent in the two frame video image sequences is carried out the image subtraction process.Video sequence image is that the low frequency at lettering pen has and can adjust the synchronous flicker of video camera frame frequency and write under the control of signal, by video camera accurately collect alternately contain lettering pen dark/the bright video sequence image of lettering pen.The sequence of video images that for example receives is:
, [Tn], [Tn+1], [Tn+2] ... [Tn+m-1], [Tn+m] ... (wherein n, m is a positive integer).
The bionics image sequence that generates is:
, [Sn], [Sn+1], [Sn+2] ... [Sn+m-1], [Sn+m] ... (wherein n, m is a positive integer).
Because [Sn]=[Tn]-[Tn-1]
So the bionics image sequence that generates also can be expressed as:
…，[Tn]-[Tn-1]，[Tn+1]-[Tn]，…，[Tn+n]-[Tm+n-1]，…。
[Tn] and [Tn-1] are immediate two two field pictures on video sequence, because the image acquisition time interval is quite short, 1/50-1/60 second normally is so can think that this two two field picture is similar.Again because this two frame video image is the most approaching on the sequence, and under the synchronous flicker of lettering pen dot signal source and frame signal (bright/dark) state of a control, take continuously by video camera, so must a frame be arranged wherein in this two frame video image is that lettering pen dot signal source is bright, another frame must be that lettering pen dot signal source is dark, after two two field pictures are pressed the processing of bionics image processing algorithm, similar background is all offset, and is highlighted significantly by the dot signal source signal on the different tip of stylus of bright/dark state.Also can extract very strong under the abominable situation of serious ground unrest and the trajectory signal of lettering pen nib clearly so can and have in the light source situation of any character, Here it is, and the bionics Flame Image Process compared with prior art embodies distinctive superiority.
Low frequency flicker is write signal and camera frame synchronization pulse waveform as shown in Figure 6, and when low frequency flicker was write signal 52a and is 1 signal, corresponding point-like signal source duty 51a was dark.On the contrary, when low frequency flicker was write signal 52b and is 0 signal, corresponding point-like signal source duty 51b was bright.Write in low frequency flicker under the control of signal, the flicker of dot signal source outwards sends light signal.The modulation signal receptacle is converted into electric signal after receiving this light signal, by low pass worry ripple device low frequency flicker being write Signal Separation comes out, carry out signal amplification/shaping again, obtain writing the signal same frequency with low frequency flicker, synchronous rect.p. utilizes going up of rect.p. to jump the limit and can obtain adjusting camera frame synchronizing pulse train 53 with the following limit of jumping.Between two adjacent frame-synchronizing impulses, it is the image acquisition cycle of video camera.Because system of the present invention can definitely guarantee image acquisition cycle of video camera and the dark 51a of dot signal source duty and bright 51b clear and definite alternately corresponding relation is arranged, so system can collect alternately dark/bright image of lettering pen exactly, for the bionics Flame Image Process provides reliable assurance on hardware view.
The bionics Flame Image Process can realize with software.In order to realize the bionics Flame Image Process quickly, the bionics Flame Image Process also can realize with hardware, and bionics principle interactive electric whiteboard realization of the present invention real time implementation is truly handled, and its block diagram as shown in Figure 7.High speed A device 62 is the digitized image pixel value T (x of present frame, y, t) deliver to bionics image processing algorithm hardware module 63, fifo queue (FIFO) 65 is exported and the corresponding previous frame digitized image pixel value T (x of high speed A device 62 outputs simultaneously, y is t-1) to bionics image processing algorithm hardware module 63.In bionics image processing algorithm hardware module 63, carry out S (x, y, t)=| T (x, y, t)-T (x, y, t-1) | be the most basic computing of computing machine because two integers subtract each other and take absolute value, so be easy to realize with existing integrated circuits.(x, y t) send image memory 64 bionics image processing algorithm hardware module result S.Current frame signal T (the x of high speed A device 62 outputs, y, t) while also is input to the input end of fifo queue (FIFO) 65, under the effect of shift pulse 61, high speed A device 62 output next bit digitized image pixel values, (t) the digitized image pixel value moves into fifo queue (FIFO) 65 for x, y current T simultaneously.Because the size of the length of fifo queue (FIFO) and the image of camera acquisition is complementary, so can guarantee that the location of pixels of the present frame that high speed A device 62 is exported is identical all the time with the relative position of the previous frame image pixel of fifo queue (FIFO) 65 outputs.
Reasonable is that the lettering pen signal is an infrared light, any visible light, and ultraviolet light, electromagnetic wave or ultrasound wave are the functions that laser beam can also substitute laser pointer.
Reasonable is that signal on the lettering pen nib is not a stationary singnal, but the Dynamic Signal that can modulate.
The reasonable Dynamic Signal of modulating that is lettering pen sends has two kinds, a kind of is low frequency, can control the flicker of the synchro control of video camera frame frequency and write signal, and another kind is a high frequency, the control function modulation signal that can modulate, available worry ripple device is separated them.
Reasonable is that the image of camera acquisition is with to write written flash signal synchronous, to guarantee to obtain high-quality bionics image.
Reasonable is to be based upon bionics image processing algorithm in the bionics image basis not only processing speed is fast, and can accurately extract the signal on the tip of stylus from the complex image background.
Reasonable is the speed that bionics multilayer digital picture structure can be accelerated Flame Image Process and graphical analysis widely, can reach the effect that near real time is handled.
Reasonable is that the bionics Flame Image Process can realize with hardware, makes the real time implementation truly of bionics principle interactive electric whiteboard reality, and these characteristics are for mode of operation 2 particular importances.
Reasonable is the existing hardware resource that can utilize the bionics principle interactive electric whiteboard, to realize the function control of various complexity.
Reasonable is that the lettering pen signal adopts the Dynamic Signal that can modulate, and than using the stationary singnal power saving, this is extremely important to the lettering pen that makes battery operation, and it can prolong the serviceable life of lettering pen effectively.
Claims (10)
1. high-performance interactive electric whiteboard system, its performance characteristics is:
Based on bionics multilayer digital picture structural drawing and bionics image processing algorithm;
But the dynamic modulation intelligence of two classes is sent in the dot signal source on the lettering pen nib:
(1) one class is that low frequency has the flicker that can control video camera frame frequency synchronizing information to write signal;
(2) another kind of is the modulation signal that high frequency has control function information;
It is to be produced by the high precision crystal oscillator clock signal in the lettering pen that low frequency has the flicker that can control video camera frame frequency synchronizing information to write signal;
The frame scan signal of video camera is to be produced by intrasystem high precision crystal oscillator clock signal, and the low frequency that sent by lettering pen has the flicker that can control video camera frame frequency synchronizing information to write signal dynamics to proofread and correct.
2. signal is sent in the dot signal source on the lettering pen nib according to claim 1, it is characterized in that its spectral range is very wide, is infrared light, any visible light, ultraviolet light, electromagnetic wave or ultrasound wave, is the function that laser beam can also substitute laser pointer.
3. low frequency has the flicker that can control video camera frame frequency synchronizing information to write signal according to claim 1, it is characterized in that controlling video camera accurately gather special alternately contain lettering pen dark/the bright video sequence image of lettering pen.
4. the high frequency of chatting as claim 1 contains the modulation signal of control function information, it is characterized in that, function control signal to this high frequency modulated carries out demodulation, function control signal with demodulation reaches the existing hardware resource of passing through the bionics principle interactive electric whiteboard, to realize the function control of various complexity.
5. the bionics image processing algorithm of chatting as claim 1 is characterized in that, immediate two width of cloth images on the video sequence are carried out the image subtraction process.
6. the bionics image processing algorithm of being chatted as claim 1 or 5 is characterized in that, realizes the bionics image processing algorithm with software or hardware.
7. the bionics multilayer digital picture structure of chatting as claim 1 is characterized in that, is a kind of special pyramid digital picture structure.
8. chatting low frequency as claim 1 or 3 has the flicker that can control video camera frame frequency synchronizing information to write signal, it is characterized in that considering the ripple device with low pass separates.
9. contain the modulation signal of control function information as claim 1 or 4 high frequencies of being chatted, it is characterized in that separating with high-pass filter.
10. the bionics image processing algorithm of chatting as claim 1,5 or 6 is characterized in that, in the mode of operation 1, is by independently microprocessing systems execution; In the mode of operation 2, be to finish by the software in the computing machine.
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| CN2010101186616A Pending CN102147683A (en) | 2010-02-07 | 2010-02-07 | High-performance interactive electronic whiteboard based on bionic principle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103488354A (en) * | 2013-10-10 | 2014-01-01 | 南京芒冠光电科技股份有限公司 | Mutual-control type synchronous electronic whiteboard system |
| CN103513755A (en) * | 2012-06-21 | 2014-01-15 | 宏碁股份有限公司 | Electronic system, slave electronic device and signal transmission method |
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2010
- 2010-02-07 CN CN2010101186616A patent/CN102147683A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513755A (en) * | 2012-06-21 | 2014-01-15 | 宏碁股份有限公司 | Electronic system, slave electronic device and signal transmission method |
| CN103513755B (en) * | 2012-06-21 | 2016-08-03 | 宏碁股份有限公司 | Electronic system, slave electric device and method for transmitting signals |
| CN103488354A (en) * | 2013-10-10 | 2014-01-01 | 南京芒冠光电科技股份有限公司 | Mutual-control type synchronous electronic whiteboard system |
| CN103488354B (en) * | 2013-10-10 | 2016-03-16 | 南京芒冠科技股份有限公司 | The synchronous electric whiteboard system of a kind of intercontrolling |
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Application publication date: 20110810 |