CN101819476A - Alternating current pointing light pen, multi-light-pen identification device and method of multi-light-pen identification - Google Patents
Alternating current pointing light pen, multi-light-pen identification device and method of multi-light-pen identification Download PDFInfo
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Abstract
The invention discloses an alternating current pointing light pen, a multi-light-pen identification device and a method of multi-light-pen identification. The shell of the alternating current pointing light pen is internally provided with an alternating light control circuit which is respectively electrically connected with a power supply management circuit and a light source, and a touch switch is close to the switch of the alternating light control circuit. A transmitting device and a receiving device of the multi-light-pen identification device are arranged at the same side of a writing screen or are respectively arranged at the two sides of the writing screen, wherein the transmitting device comprises a first pointing light pen and a second pointing light pen, and the first pointing light pen is an alternating point light pen; the receiving device comprises a camera and a signal processing circuit which are mutually and electrically connected, the lens of the camera aims at the normal of the screen, the signal processing circuit comprises an amplifying circuit, a high-speed comparing circuit and an identification control circuit which are sequentially connected in series, and the identification control circuit comprises a multi-light-pen identification module. The invention has the advantages that firstly, the alternating pointing light pen can be obtained only by increasing the alternating control circuit on the basis of the traditional direct current pointing light pen, thereby the alternating pointing light pen has simple structure; and secondly, the multi-light-pen identification device can quickly identify a plurality of light pens.
Description
Technical field
The present invention relates to the method for a kind of alternating current pointing light pen, multi-light-pen identification device and the identification of many light pens, accurate differentiation when the light pen of can realizing giving more directions uses simultaneously, the method for described multi-light-pen identification device and the identification of many light pens can be applied to give more directions the multi-users such as interactive electric whiteboard of pen simultaneously in the operated system.
Background technology
The recognition technology of many light pens all has a wide range of applications in a lot of fields, and in the large-screen interactive formula electric whiteboard system such as multi-user's use, one of its gordian technique is exactly the identification of many light pens.
Along with the development of human-computer interaction technology, multi-user operation more and more is subject to people's attention, and increasing product support multi-user operates simultaneously.In the big screen commanding system, often to realize that many people command simultaneously, for current common single pointing light pen device, can't satisfy the demand of multi-user operation.On the other hand, for same user, also many pointing light pens can be used in combination, such as with two pointing light pens, wherein a light pen is fixed on the operand, another light props up pen and draws a circle around it, then can realize the rotation to operand, perhaps two light pen points move toward different directions on same operand, then can realize the stretching of operand or compression or the like, these operating effects are more simple and convenient compared with realizing with single pointing light pen, gather around to have broad application prospects.
A kind of multi-light-pen identification device accurately that promptly makes things convenient for does not again also appear in present stage, and the present invention has filled up this technology vacancy on the one hand.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of multi-light-pen identification device, each other identification when the light pen of realizing giving more directions exists simultaneously.
The present invention solves the technical scheme that its technical matters takes: alternating current pointing light pen mainly comprises a shell, battery, electric power management circuit, touch switch and luminophor, described battery and electric power management circuit are electrically connected, described luminophor comprises light source and lamp guide, the luminous end of light source is fixedlyed connected with lamp guide, the other end of light source is fixedlyed connected with touch switch, the front end of shell is provided with the perforate that is complementary with luminophor, described luminophor places this perforate, the front end of described lamp guide places outside the shell, described battery, electric power management circuit and touch switch place in the shell, wherein, also be provided with the alternation light control circuit in described the shell, this alternation light control circuit is electrically connected with electric power management circuit and light source respectively, and the switch of touch switch and alternation light control circuit is close.
The present invention uses the multi-light-pen identification device of above-mentioned alternating current pointing light pen mainly to comprise emitter, receiving trap and writes screen, described emitter and receiving trap place the same side of writing screen or be placed in writes the both sides of screen, described emitter comprises first pointing light pen and second pointing light pen, and described receiving trap comprises the video camera and the signal processing circuit of mutual electrical connection; The alignment lens of described video camera is write the normal of screen; Described signal processing circuit comprises amplifying circuit, high speed comparator circuit and the recognition control circuit of series connection successively, and described recognition control circuit contains many light pens identification module; Described first pointing light pen is an alternating current pointing light pen.
Further, second pointing light pen of the present invention is the direct current pointing light pen.
Further, second pointing light pen of the present invention is an alternating current pointing light pen.
Further, the alternating cycles or the dutycycle of second pointing light pen of the present invention and first pointing light pen are different.
Further, recognition control circuit of the present invention comprises camera driver module and many light pens identification module, and the camera driver module is electrically connected with video camera, and many light pens identification module is electrically connected with the high speed comparator circuit.
The method that the present invention uses above-mentioned multi-light-pen identification device to carry out many light pen identifications mainly comprises the steps:
(1) video camera is started working;
(2) first pointing light pen and second pointing light pen are contacted with writing screen simultaneously, so that the light source of first pointing light pen and second pointing light pen begins is luminous, described first pointing light pen sends interchange light;
The light that (3) first pointing light pens and second pointing light pen send incides video camera and converts electric signal to;
(4) video camera amplifies the amplifying circuit that described electric signal is input to signal processing circuit, and the electric signal after the amplification is input to many light pens identification module of recognition control circuit through the high speed comparator circuit;
(5) many light pens identification module detects the position of first pointing light pen and second pointing light pen, and obtains the number of the interior detected pointing light pen of scan period of same video camera;
(6) in adjacent two scan periods of video camera, if many light pens identification module detects single pointing light pen in a scan period therein, and in another adjacent scan period, detect two pointing light pens, then execution in step;
(7) if the position that detects two pointing light pens and one of them pointing light pen in the scan period of the video camera of many light pens identification module in step than the position of the position of another pointing light pen detected single pointing light pen in more approaching adjacent scan period, then that pointing light pen of more approaching single pointing light pen is the direct current pointing light pen, and another pointing light pen is an alternating current pointing light pen.
Further, the alternating cycles of first pointing light pen of the present invention is 2～3 times of scan period of described video camera, and the dutycycle of each described alternating cycles is 1: 1～2.
Compared with prior art, the invention has the beneficial effects as follows:
(1) only need increase an alternation light control circuit on the basis of existing direct current pointing light pen just can obtain alternating current pointing light pen of the present invention, simple in structure.
(2) for multi-light-pen identification device, prior art adopts two different methods that pointing light pen combines of brightness usually, this method is because there is aberration in the camera optics system, different with the centre position imaging to same pointing light pen in the screen edge position, thus the erroneous judgement when causing the identification of many light pens easily is disconnected.And the method that the present invention adopts alternating current pointing light pen to combine with other pointing light pen (direct current pointing light pen or alternating current pointing light pen), can not be subjected to the influence of camera optics system aberration during identification, can the different pointing light pen of quick identification, and the accuracy of identification height, to be difficult for producing erroneous judgement disconnected.
Description of drawings
Fig. 1 is the structural representation of alternating current pointing light pen of the present invention;
Fig. 2 is the fundamental diagram of multi-light-pen identification device of the present invention;
Fig. 3 is the structural representation of direct current light pen in the multi-light-pen identification device of the present invention;
Fig. 4 is the structural principle block diagram of signal processing circuit in the recognition device of the present invention;
Fig. 5 is that the alternating cycles when the present invention's first pointing light pen is 2 times of ccd video camera scan period, the dutycycle of alternating cycles is 1: 1, and the alternation jump of alternating current pointing light pen and when the CCD scan period, starting point was synchronous, CCD scanning output signal through amplifying circuit and high speed comparator circuit after the distribution situation synoptic diagram of pointing light pen picture;
Fig. 6 is that the alternating cycles when the present invention's first pointing light pen is 3 times of CCD scan period, dutycycle be under 1: 2 the situation CCD scanning output signal through amplifying circuit and high speed comparator circuit after the distribution situation synoptic diagram of pointing light pen picture,
Wherein, (a) be that first pointing light pen only detects the situation point light pen that once exchanges the light pen picture in the right and per three CCD scan periods of many light pens identification module of direct current pointing light pen; (b) be that first pointing light pen only detects the situation that once exchanges the light pen picture in the left side and per three CCD scan periods of many light pens identification module of direct current pointing light pen; (c) be first pointing light pen on the right of direct current pointing light pen and per three CCD scan periods of many light pens identification module detect the situation that exchanges the light pen picture for twice; (d) be first pointing light pen on the left side of direct current pointing light pen and per three CCD scan periods of many light pens identification module detect the situation that exchanges the light pen picture for twice;
Fig. 7 is the fundamental diagram of many light pens identification module in the recognition control circuit of the present invention.
Embodiment
As shown in Figure 1, alternating current pointing light pen comprises luminophor, touch switch 13, alternation light control circuit 17, electric power management circuit 14, battery 15 and a shell 16.Wherein luminophor comprises lamp guide 11 and light source 12 again, and the front end of luminophor places outside the shell 16.Shell 16 front ends are provided with the perforate with the luminophor size match.Luminophor places this perforate, and can be along the axial activity of perforate; Battery 15, electric power management circuit 14, alternation light control circuit 17 and touch switch 13 place in the shell 16; Battery 15 is connected with electric power management circuit 14; Alternation light control circuit 17 links to each other with light source 12 with electric power management circuit 14 respectively; The luminous end of light source 12 and fixedly adhesion of lamp guide 11; The other end of light source 12 connects a touch switch 13, touch switch 13 is close with the switch of alternation light control circuit 17, along with luminophor can make the switch of alternation light control circuit 17 can disconnect or closure under the effect of touch switch 13 along the axial activity of perforate.
The multi-light-pen identification device that the present invention has used above-mentioned alternating current pointing light pen comprises first pointing light pen 1, second pointing light pen 2, writes screen 3, video camera 4 and signal processing circuit 5 as shown in Figure 2.Wherein, first pointing light pen 1 is an alternating current pointing light pen, exchanges light 6 with writing to send when screen 3 contacts; Second pointing light pen 2 is the direct current pointing light pen, sends direct current light 7 when screen 3 contacts with writing.The normal direction that video camera 4 alignment lenses are write screen 3 is with to whole screen imaging.Alternating current pointing light pen and direct current pointing light pen contact the light that is produced and incide video camera 4 with writing screen 3, and video camera 4 is connected with signal processing circuit 5.
For first pointing light pen 1 (being alternating current pointing light pen), what touch switch 13 adopted usually is a spring.The effect of alternation light control circuit 17 is the light that the light source 12 of control alternating current pointing light pen 1 produces the alternation form.As one embodiment of the present invention, alternation light control circuit 17 is a square wave generation circuit, and the core of this square wave generation circuit is MSP430 single-chip microcomputer and field effect transistor that a slice Texas Instruments produces, and the model of this single-chip microcomputer is M430F1232.Battery 15 adopts No. seven dry cells of a joint, and voltage is 1.5V.The core of electric power management circuit 14 is power management chips that a slice ON Semiconductor company produces, model is NCP1400ASN33T1, the input voltage of dry cell 1.5V can be elevated to 3.3V output, operating voltage be provided for respectively MSP430 single-chip microcomputer and light source 12.The light source 12 employing power that exchange light pen are the infrared semiconductor laser of 5mw, use infrared light supply can reduce the interference of surround lighting, thereby improve the stability and the precision of system works.In addition, alternating current pointing light pen 1 luminous, except the light 6 of square wave form, alternation light control circuit 17 of the present invention also can be sinusoidal wave generation circuit and produces the light of alternation forms such as sine, or the light of other alternation forms.
When alternating current pointing light pen 1 contacts 3 with screen, lamp guide 11 and light source 12 promote the switch closure that spring makes square wave generation circuit 17, single-chip microcomputer is started working under the voltage that electric power management circuit 14 provides, single-chip microcomputer alternately calls two delay functions, in different delayed time in the time, export high-low level respectively at the I/O of single-chip microcomputer mouth, the ratio of the delay time of these two delay functions is the dutycycle of square wave.The I/O mouth of single-chip microcomputer is connected to the grid of the field effect transistor of square wave generation circuit, the drain electrode of field effect transistor is connected to the negative pole of light source by a current-limiting resistance, the positive pole of light source is connected to 3.3V voltage, the field effect transistor source ground, the model of field effect transistor is selected 2N7002, the high-low level that utilizes the I/O mouth to replace is like this controlled the break-make of field effect transistor, makes alternating current pointing light pen 1 send the bright interchange light 6 that secretly replaces.
For the direct current pointing light pen, as shown in Figure 3, the difference of it and alternating current pointing pen is not have alternation light control circuit 17, and electric power management circuit 24 directly links to each other with light source 22, the switch of touch switch 23 close electric power management circuits 24.When this direct current pointing light pen contacts with screen 3, lamp guide 21 and light source 22 promote the switch closure that spring 23 makes electric power management circuit 24, electric power management circuit 24 provides constant operating voltage to direct current pointing light pen light source 22, and the direct current pointing light pen sends the light 7 of brightness constancy.
As one embodiment of the present invention, in multi-light-pen identification device of the present invention, video camera 4 can adopt linear array CCD camera, and the common along continuous straight runs of CCD chip is placed.The line array CCD that the CCD chip can adopt Sony Corporation to produce, model is ILX511.Signal processing circuit 5 comprises amplifying circuit 53, high speed comparator circuit 52 and the recognition control circuit 51 of series connection successively as shown in Figure 4.Wherein recognition control circuit 51 comprises CCD driver module 511 and many light pens identification module 512 again.The core of recognition control circuit 51 is CPLD chips that a slice altera company produces, and the model of employing is EPM1270T144.Amplifying circuit 53 can adopt amplifier chip TL084, realizes oppositely amplifying.The comparer chip that high speed comparator circuit 52 can adopt Linear Tech to produce, model is LT1016, high speed comparator circuit 52 can be converted into simulating signal the accessible digital signal of CPLD.CCD driver module 511 and many light pens identification module 512 all are to utilize the Verilog hardware description language, realize by programming in the CPLD chip.Write CCD driver module 511 according to the drive waveforms on the CCD chip data handbook, and be connected with ccd video camera.The light pen identification module 512 of giving more directions is connected with high speed comparator circuit 52.If above-mentioned ccd video camera carries driving, then need not to be provided with CCD driver module 511 in the recognition control circuit 51.
The course of work that the present invention is based on the multi-light-pen identification device of CCD mainly comprises following key step:
1.CCD the output signal of driver module 511 is input to ccd video camera, ccd video camera is started working.
2. when first pointing light pen 1 (for alternating current pointing light pen) and second pointing light pen 2 (for the direct current pointing light pen) while when on screen 3, operating, first pointing light pen 1 sends the direct current light 7 that interchange light 6, the second pointing light pens 2 that brightness is the square wave form send brightness constancy.
3. the light that sends of first pointing light pen 1 and second pointing light pen 2 is through lamp guide 11 and lamp guide 21, forms two hot spots on the screen 3 writing, and through ccd video camera scanning, finishes the conversion of light signal to electric signal.
4.CCD the reverse amplification of scanning output signal by amplifying circuit 53 on the signal processing circuit 5, pass through high speed comparator circuit 52 again, be converted into recognition control circuit 51 accessible digital signals, output to many light pens identification module 512 of recognition control circuit 51.
5. many light pens identification module 512 is analyzed input signal, and light pen is discerned to giving more directions.
Many light pens identification module 512 realizes that the principle of many light pen identifications is: CCD chip in the ccd video camera is installed in horizontal direction, alternating current pointing light pen and direct current pointing light pen are imaged on the CCD chip after writing two hot spots process optical systems of ccd video camera 4 that form on the screen 3, and these two similarly is two bright lines on the vertical direction, if two pointing light pens position difference in the horizontal direction, then these two bright lines are parallel to each other, and all intersect vertically with the line array CCD chip, the output signal that shows CCD reduces for the voltage of the location point of corresponding two bright lines, the time shaft correspondence of ccd output signal be exactly the position of CCD chip direction.This shows, the position correspondence of pointing light pen on screen 3 bright line and CCD intersection location, if can distinguish the intersection location (representing this position with relative scanning cycle starting point to the time N that detects bright line in ccd output signal) of the bright line and the CCD of bifurcation pointing light pen then can realize the identification of two pointing light pens on the screen 3.
If the scan period of line array CCD is T, the duty cycle square wave of alternating current pointing light pen is 1: 1, alternating cycles is 2T, saltus step place of square wave and linear array CCD scanning cycle starting point are synchronous, direct current pointing light pen and alternating current pointing light pen all do not have on the screen 3 to move writing, article two, bright line is constant all the time with the intersection location of CCD respectively, i.e. N1=N2.By analyzing the output signal of CCD, as shown in Figure 5, the position that detects bright line is divided into N1 and two kinds of situations of N3, the wherein corresponding bright line P1 of N1, P2, P4, P5, the corresponding bright line P3 of N2, P6, wherein position N1 has bright line all the time, can assert that this position N1 corresponds to direct current pointing light pen 2 and screen position contacting; And the bright line of position N3 only alternately occurs in the cycle at T2 and T4, and position N3 corresponds to alternating current pointing light pen and screen position contacting.Can identify pointing light pen this moment in two scan periods, realize the quick identification of many light pens.
The present invention if with the duty cycle square wave of first pointing light pen 1 be adjusted into 1: 2, the corresponding 3T of being adjusted into of alternating cycles, also can realize the many light pens of quick identification.This moment, high level lasting time was T, and low duration is 2T.Its principle is as follows: detect bright line and represent with 1 in the scan period of CCD, not detecting bright line represents with 0, then according to comparative voltage and square wave bound-time difference with respect to CCD scan period zero-time, can occur 100100100 ... perhaps 110110110 ... both of these case, 100 or 110 these two states circulations just occur, when direct current pointing light pen and alternating current pointing light pen exist simultaneously, position with the video camera place is seen towards the direction of screen, when the left side of direct current pointing light pen at alternating current pointing light pen, ccd output signal has (a) and (c) two kinds of possible situations as shown in Figure 6; When the right at alternating current pointing light pen of direct current pointing light pen, ccd output signal has (b) and (d) two kinds of possible situations as shown in Figure 6.Wherein, (a) be that alternating current pointing light pen only detects the situation that once exchanges the light pen picture in the right and per three CCD scan periods of many light pens identification module of direct current pointing light pen; (b) be that alternating current pointing light pen only detects the situation that once exchanges the light pen picture in the left side and per three CCD scan periods of many light pens identification module of direct current pointing light pen; (c) be alternating current pointing light pen on the right of direct current pointing light pen and per three CCD scan periods of many light pens identification module detect the situation that exchanges the light pen picture for twice; (d) be alternating current pointing light pen on the left side of direct current pointing light pen and per three CCD scan periods of many light pens identification module detect the situation that exchanges the light pen picture for twice; No matter be which kind of situation, continuous three CCD can occur once in adjacent two scan periods at least in the scan period, many light pens identification module 512 detects single pointing light pen in a scan period therein, and detects two pointing light pens in another adjacent scan period.Consider in the pointing light pen use and will inevitably move, but because the CCD scan period is very little, as one embodiment of the present invention, be made as 5ms, in so extremely short time of adjacent scan period, the distance that pointing light pen moves is limited, therefore can suppose in the adjacent C CD scan period, the change in location of detected same pointing light pen is little, if the position that detects two pointing light pens and one of them pointing light pen in the scan period is than the position of the position of another pointing light pen detected single pointing light pen in more approaching adjacent scan period, because the position of single pointing light pen must be the position of direct current pointing light pen, so that pointing light pen of more approaching single pointing light pen position is the direct current pointing light pen in two pointing light pens, another pointing light pen is an alternating current pointing light pen.If the comparative voltage of high speed comparator circuit 52 less than the bright spot of bright line at electric charge that T/2 was accumulated in the time through CCD output and the magnitude of voltage after amplifying, then can further avoid the erroneous judgement in the light pen identifying disconnected.
In many light pens identification module 512 ccd output signal through amplifying circuit 53 and high speed comparator circuit 52 is detected, owing to passed through reverse amplification and compared at a high speed, the electric signal of bright line position correspondence is a high level.Consider and only need carry out many light pen identifications, the position of detecting bright line can be reduced to the position of detecting the high level rising edge.With the clock frequency counting of CCD output pixel, the value M in the counter also is the position on the CCD chip direction with regard to the represent pixel number when the scan period of CCD begins.
When the duty cycle square wave of alternating current pointing light pen is 1: 2, and alternating cycles is when being 3T, the course of work of many light pens identification module 512 as shown in Figure 7, the CCD scan period begins hour counter I sum counter II and begins counting.If do not detect high level, wait until that always the CCD scan period finishes, counter I sum counter II zero clearing begins the detection of following one-period then; If detect high level, then counter I stops counting, continue to detect high level, if detect high level once more, two bright lines were arranged in this scan period just, this hour counter II stops counting, preserve the value M2 among the value M1 sum counter II among the counter I, the position of corresponding article one bright line of difference and second bright line, and exist the periodicity m of two bright lines to add 1 same scan period, wait until that then the CCD scan period finishes, counter I sum counter II zero clearing begins the detection of following one-period; If do not detect high level again, be to have only a bright line this one-period, then judge, if the one-period before this CCD scan period does not detect two bright lines, be m=0, then also can't judge that the CCD scan period finishes by the time, counter I sum counter II begins the detection of following one-period then; If m is not 0, preserve the value M3 among this scan period counter I, can realize the identification of two pointing light pens this moment: when | M3-M1|＜| during M3-M2|, can think that M3 and M1 are the position of same pointing light pen, and the position of M3 is CCD when having only a bright line in scan period bright line, corresponding must be the position of direct current pointing light pen 2, so M1 also is the position of direct current pointing light pen 2, M2 then is the position of alternating current pointing light pen; Otherwise, can think that M3 and M2 are the position of same pointing light pen, the position that same M2 must corresponding direct current pointing light pen, so position of the corresponding alternating current pointing light pen of M1, the position of the corresponding direct current pointing light pen of M2, so far, the identification when we have realized two pointing light pens are used simultaneously.
When video camera adopts linear array CCD camera and two pointing light pens coordinate is identical in the horizontal direction, the bright line of two pointing light pens overlaps, can't distinguish, at this moment, can increase a linear array CCD camera, with the screen normal direction is turning axle, and original C CD video camera revolves and turn 90 degrees relatively, can distinguish two pointing light pens at vertical direction like this.
As another embodiment of the invention, second pointing light pen 2 also can be alternating current pointing light pen.In addition, operate the quantity of the pointing light pen of can increasing exchanges simultaneously for the realization more users.For above both of these case, all need to satisfy alternating cycles or dutycycle difference between each alternating current pointing light pen.With second pointing light pen 2 be the direct current pointing light pen situation in like manner, two alternating current pointing light pens of different alternating cycles or dutycycle, the distribution situation difference of detected alternating current pointing light pen picture in camera signal, according to the distribution of the occurrence and the detected alternating current pointing light pen picture of alternating cycles or dutycycle, can distinguish many alternating current pointing light pens.
Claims (8)
1. alternating current pointing light pen, comprise a shell (16), battery (15), electric power management circuit (14), touch switch (13) and luminophor, described battery (15) and electric power management circuit (14) are electrically connected, described luminophor comprises light source (12) and lamp guide (11), the luminous end of light source (12) is fixedlyed connected with lamp guide (11), the other end of light source (12) is fixedlyed connected with touch switch (13), the front end of shell (16) is provided with the perforate that is complementary with luminophor, described luminophor places this perforate, the front end of described lamp guide (11) places outside the shell (16), described battery (15), electric power management circuit (14) and touch switch (13) place in the shell (16), it is characterized in that: also be provided with alternation light control circuit (17) in described the shell (16), this alternation light control circuit (17) is electrically connected with electric power management circuit (14) and light source (12) respectively, and touch switch (13) is close with the switch of alternation light control circuit (17).
2. multi-light-pen identification device that uses the described alternating current pointing light pen of claim 1, it is characterized in that: comprise emitter, receiving trap and write screen (3), described emitter and receiving trap place the same side of writing screen (3) or be placed in writes the both sides of screen (3), described emitter comprises first pointing light pen (1) and second pointing light pen (2), and described receiving trap comprises the video camera (4) and the signal processing circuit (5) of mutual electrical connection; The normal of the alignment lens screen (3) of described video camera (4); Described signal processing circuit (5) comprises amplifying circuit (53), high speed comparator circuit (52) and the recognition control circuit (51) of series connection successively, and described recognition control circuit (51) contains many light pens identification module (512); Described first pointing light pen (1) is an alternating current pointing light pen.
3. multi-light-pen identification device according to claim 2 is characterized in that: described second pointing light pen (2) is the direct current pointing light pen.
4. multi-light-pen identification device according to claim 2 is characterized in that: described second pointing light pen (2) is an alternating current pointing light pen.
5. multi-light-pen identification device according to claim 4 is characterized in that: described second pointing light pen (2) is different with the alternating cycles or the dutycycle of first pointing light pen (1).
6. multi-light-pen identification device according to claim 2, it is characterized in that: described recognition control circuit (51) comprises camera driver module (511) and many light pens identification module (512), camera driver module (511) is electrically connected with video camera (4), and many light pens identification module (512) is electrically connected with high speed comparator circuit (52).
7. a method of using the described multi-light-pen identification device of claim 3 to carry out many light pen identifications is characterized in that comprising the steps:
(1) video camera (4) is started working;
(2) with first pointing light pen (1) and second pointing light pen (2) simultaneously with write screen (3) and contact, so that the light source of first pointing light pen (1) and second pointing light pen (2) begins luminous, described first pointing light pen (1) sends interchange light, and described second pointing light pen (2) sends direct current light.
The light that (3) first pointing light pens (1) and second pointing light pen (2) send incides video camera (4) and converts electric signal to;
(4) video camera amplifies the amplifying circuit (53) that described electric signal is input to signal processing circuit, and the electric signal after the amplification is input to many light pens identification module (512) of recognition control circuit (51) through high speed comparator circuit (52).
(5) many light pens identification module (512) detects the position of first pointing light pen (1) and second pointing light pen (2), and obtains the number of the interior detected pointing light pen of scan period of same video camera (4);
(6) in adjacent two scan periods of video camera (4), if many light pens identification module (512) detects single pointing light pen in a scan period therein, and in another adjacent scan period, detect two pointing light pens, then execution in step (7);
(7) if the position that detects two pointing light pens and one of them pointing light pen in the scan period of the video camera (4) of many light pens identification module (512) in step (5) than the position of the position of another pointing light pen detected single pointing light pen in more approaching adjacent scan period, that pointing light pen of then more approaching single pointing light pen position is the direct current pointing light pen, and another pointing light pen is an alternating current pointing light pen.
8. method of carrying out the identification of many light pens according to claim 7 is characterized in that: the alternating cycles of described first pointing light pen (1) is 2～3 times of scan period of described video camera (4), and the dutycycle of each described alternating cycles is 1: 1～2.
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| CN102880356A (en) * | 2012-09-13 | 2013-01-16 | 福州锐达数码科技有限公司 | Method for realizing dual-pen writing based on electronic white board |
| CN103207706A (en) * | 2012-01-13 | 2013-07-17 | 南京先能光电科技有限公司 | Double-light pen electronic whiteboard system and light pen identifying method |
| CN103500333A (en) * | 2013-09-17 | 2014-01-08 | 锐达互动科技股份有限公司 | Method for identifying light-emitting device through light coding |
| CN103941924A (en) * | 2014-04-25 | 2014-07-23 | 锐达互动科技股份有限公司 | Interactive projection device and method for conducting infrared light coding and decoding and method thereof |
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