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 PDF

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CN101819476A
CN101819476A CN 201010143736 CN201010143736A CN101819476A CN 101819476 A CN101819476 A CN 101819476A CN 201010143736 CN201010143736 CN 201010143736 CN 201010143736 A CN201010143736 A CN 201010143736A CN 101819476 A CN101819476 A CN 101819476A
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China
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light
pen
pointing
light pen
stylus
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CN 201010143736
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Chinese (zh)
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刘旭
彭超然
李海峰
郑臻荣
黄文标
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浙江大学
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Priority to CN 201010143736 priority Critical patent/CN101819476A/en
Publication of CN101819476A publication Critical patent/CN101819476A/en

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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

交流指点光笔、多光笔识别装置及多光笔识别的方法 The method of a light pen, a light pen recognition device and the multi-multi optical communication pointing pen recognition

技术领域 FIELD

[0001] 本发明涉及一种交流指点光笔、多光笔识别装置以及多光笔识别的方法,可以实现多指点光笔同时使用时的准确区分,所述多光笔识别装置及多光笔识别的方法可以应用于多指点笔的交互式电子白板等多用户同时操作的系统中。 [0001] The present invention relates to a communication pointing stylus, multiple light pen recognition means and a plurality of light pen recognition method can be implemented more guidance to accurately distinguish between when the light pen simultaneously, the multiple light pen recognition apparatus and method for a multi-light pen recognition may be applied multi pointing pen system of simultaneous multi-user interactive whiteboard like operation.

背景技术 Background technique

[0002] 多光笔的识别技术在很多领域都有着广泛的应用,比如多用户使用的大屏幕交互式电子白板系统中,其关键技术之一就是多光笔的识别。 [0002] Multi-light pen recognition technology in many fields have a wide range of applications, such as large-screen interactive whiteboard system used in multi-user, multi-technology is one of the key light pen recognition.

[0003] 随着人机交互技术的发展,多用户操作越来越受到人们的重视,越来越多的产品支持多用户同时操作。 [0003] With the development of human-computer interaction technology, multi-user operation more and more attention, more and more products to support multiple users simultaneously. 比如大屏幕指挥系统中,往往要实现多人同时指挥,对于当前常见的单指点光笔装置,无法满足多用户操作的需求。 For example, large-screen command system, often achieve more than the same command, the current common single light pen pointing device and can not meet the needs of multi-user operation. 另一方面,对于同一用户,也可以将多支指点光笔结合使用,比如用两只指点光笔,其中一支光笔固定在操作对象上,另一光支笔围绕它画圈,则可以实现对操作对象的旋转,或者两支光笔点在同一操作对象上往不同的方向移动,则可实现对操作对象的拉伸或压缩等等,这些操作效果比起用单指点光笔实现更简单方便,拥有广阔的应用前景。 On the other hand, for the same user, it may be multi-branching optical pointing pen used in combination with two pointers such as light pen, a light pen which is fixed to the operation target, the other light pen circle around it, the operation can be achieved rotation of the object, or the two light pen point is moved in the same operation target in different directions, the operation target can be achieved on the tension or compression, etc., these operations effects achieve more than a simple single light pen pointing, with broad prospects.

[0004] 现阶段还没有出现一种即方便又准确的多光笔识别装置,本发明填补了这一方面的技术空缺。 [0004] Present i.e. there is not a convenient and accurate means of multiple light pen recognition occurs, the present invention is a technique to fill the vacancies in this regard.

发明内容 SUMMARY

[0005] 本发明所要解决的技术问题是:提供一种多光笔识别装置,实现多指点光笔同时存在时相互之间的识别。 [0005] The present invention solves the technical problem are: to provide a multi-light pen identification means, multi-pointing mutual recognition between the light pen exist.

[0006] 本发明解决其技术问题所采取的技术方案是:交流指点光笔主要包括笔壳、电池、 电源管理电路、接触式开关和发光体,所述电池和电源管理电路电连接,所述发光体包括光源和导光棒,光源的发光端和导光棒固定连接,光源的另一端和接触式开关固定连接,笔壳的前端设有与发光体相匹配的开孔,所述发光体置于该开孔中,所述导光棒的前端置于笔壳外,所述电池、电源管理电路和接触式开关置于笔壳内,其中,所述笔壳内还设有交变光控制电路,该交变光控制电路分别与电源管理电路和光源电连接,接触式开关与交变光控制电路的开关靠近。 [0006] The present invention to solve the technical problem adopted technical solution: alternating light pointing pen housing, battery, power management circuits, and the emitter-contact switch, and the battery is electrically connected to the main power management circuit comprising a light emitting and the other end of the contact type switch includes a light emitting end and a light guide and the light guide rod, is fixedly connected to the light source rod, light source fixedly connected to the front end of the pen housing is provided with an opening that matches the light emitter, the light emitter facing openings in the front end of the light guide rod is placed outside the pen housing, the battery, the power management circuit and a contact switch in the pen housing, wherein said housing further has a pen alternating light control circuit, the alternating light control circuit are connected to the electrical power management circuitry and the light source, a contact switch and controls the switch circuit alternating light close.

[0007] 本发明使用上述交流指点光笔的多光笔识别装置主要包括发射装置、接收装置和书写屏幕,所述发射装置和接收装置置于书写屏幕的同一侧或分置于书写屏幕的两侧,所述发射装置包括第一指点光笔和第二指点光笔,所述接收装置包括相互电连接的摄像机和信号处理电路;所述摄像机的镜头对准书写屏幕的法线;所述信号处理电路包括依次串联的放大电路、高速比较电路和识别控制电路,所述识别控制电路含有多光笔识别模块;所述第一指点光笔为交流指点光笔。 [0007] AC pointing using the light pen stylus multiple recognition apparatus of the present invention mainly comprises transmitting means, receiving means and writing screen, said transmitting means and receiving means disposed on the same side of the screen or writing on separate sides of the writing screen, said transmitting means comprises a first and a second pointer pointing light pen stylus, said receiving means comprises a video camera and a signal processing circuit electrically connected to each other; the camera at the normal writing screen; said signal processing circuit comprises successively an amplifier circuit connected in series, a high-speed comparison circuit and a control circuit identification, the identification module identifying multiple light pen comprising a control circuit; a first pointer pointing pen-stylus exchange.

[0008] 进一步地,本发明所述第二指点光笔为直流指点光笔。 [0008] Further, the present invention is the second pointer pointing to a DC light pen stylus.

[0009] 进一步地,本发明所述第二指点光笔为交流指点光笔。 [0009] Further, the present invention is the second pointer pointing pen-stylus exchange. [0010] 进一步地,本发明所述第二指点光笔和第一指点光笔的交变周期或占空比不同。 [0010] Further, the present invention is different from the second and the first pointer pointing the pen stylus or duty cycle of the alternating cycle.

[0011] 进一步地,本发明所述识别控制电路包括摄像机驱动模块和多光笔识别模块,摄像机驱动模块与摄像机电连接,多光笔识别模块与高速比较电路电连接。 [0011] Furthermore, the present invention is the recognition camera driver control circuit comprises a light pen recognition modules and multi-module, the camera driver electrically connected to the camera module, multi-module connected to the light pen to identify a high-speed comparator circuit.

[0012] 本发明使用上述多光笔识别装置进行多光笔识别的方法主要包括如下步骤: [0012] The method of using the multi-stylus pen identification means for identifying the plurality of light according to the present invention mainly comprises the following steps:

[0013] (1)摄像机开始工作; [0013] (1) the camera starts to work;

[0014] (2)将第一指点光笔和第二指点光笔同时与书写屏幕接触,以使第一指点光笔和第二指点光笔的光源开始发光,所述第一指点光笔发出交流光; [0014] (2) a first and a second pointer pointing stylus in contact with the light pen writing screen simultaneously, so that the first and second pointers pointing stylus pen light source starts emitting light, the first light pen pointing AC light emitted;

[0015] (3)第一指点光笔和第二指点光笔发出的光入射到摄像机并转换成电信号; [0015] (3) a first incident light and a second pointer pointing stylus pen emitted light into an electrical signal and to the camera;

[0016] (4)摄像机将所述电信号输入到信号处理电路的放大电路进行放大,放大后的电信号经高速比较电路输入到识别控制电路的多光笔识别模块; [0016] (4) the electrical signal inputted to the camera amplifying circuit amplifies the signal processing circuit, the amplified electric signal inputted to the comparison circuit via a high-speed multiple light pen recognition module recognizes the control circuit;

[0017] (5)多光笔识别模块检测第一指点光笔和第二指点光笔的位置,并得到同一摄像机的扫描周期内所检测到的指点光笔的个数; [0017] (5) Multi-identification module detects the position of the light pen stylus of the first and second pointer pointing stylus, light pen and get pointers same camera scanning period of the detected number;

[0018] (6)在摄像机的相邻两个扫描周期内,若多光笔识别模块在其中一个扫描周期内检测到单个指点光笔,而在相邻的另一个扫描周期内检测到两个指点光笔,则执行步骤; [0018] (6) in the adjacent two scanning periods of the camera, if multiple light pen identification module in which a single scan cycle detects light pen pointer, two pointers is detected in the adjacent light pen another scanning cycle , execute step;

[0019] (7)若多光笔识别模块在步骤中的一个摄像机的扫描周期内检测到两个指点光笔且其中一个指点光笔的位置比另一个指点光笔的位置更接近相邻的扫描周期内检测到的单个指点光笔的位置,则更接近单个指点光笔的那个指点光笔为直流指点光笔,另一个指点光笔为交流指点光笔。 The closer to the adjacent scan period detection [0019] (7) If a single sweep of the camera multi-stylus identification module in step detects two positions pointing stylus and wherein a pointing light pen than the other pointing stylus position a single location to the pointing stylus, light pen pointer that is closer single light pen pointer pointing to a DC light pen, other pointing pen-pointing stylus exchange.

[0020] 进一步地,本发明所述第一指点光笔的交变周期为所述摄像机的扫描周期的2〜 3倍,每个所述交变周期的占空比为1 : 1〜2。 [0020] Further, the present invention is the first alternating pointing stylus 2 ~ 3 times the period of the scan cycle of the camera, each duty cycle of said alternating period is 1: 1 ~.

[0021 ] 与现有技术相比,本发明的有益效果是: [0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] (1)只需要在现有的直流指点光笔的基础上增加一个交变光控制电路就可得到本发明的交流指点光笔,结构简单。 [0022] (1) only need to add a pointing alternating light control circuit AC can be obtained according to the present invention a pointing stylus, light pen simple structure based on the conventional DC.

[0023] (2)对于多光笔识别装置,现有技术通常采用亮度不同的两支指点光笔相结合的方法,这种方法由于摄像机光学系统存在像差,对同一支指点光笔在屏幕边缘位置和中间位置所成的像不同,从而容易造成多光笔识别时的误判断。 [0023] (2) For a multi-light pen identification means, commonly used prior art method of two different brightness pointing stylus combination, this method due to optical aberration of the camera system, with a light pen at the edge of the screen pointer position and different intermediate positions into the image, thereby easily cause erroneous determination when the plurality of light pen recognition. 而本发明采用交流指点光笔与其它指点光笔(直流指点光笔或交流指点光笔)相结合的方法,识别时不会受摄像机光学系统像差的影响,能够快速识别不同的指点光笔,且识别精度高、不易产生误判断。 While the present invention uses AC pointing stylus and other methods pointing stylus (DC pointing stylus or AC pointing stylus) combined, is not affected by the camera optical system aberration identifying possible to quickly identify the different pointing stylus, and a high recognition accuracy , easy to produce erroneous judgment.

附图说明 BRIEF DESCRIPTION

[0024] 图1是本发明交流指点光笔的结构示意图; [0024] FIG. 1 is a schematic view of the present invention, an AC light pen pointing;

[0025] 图2是本发明多光笔识别装置的工作原理图; [0025] FIG. 2 is a principle of the present invention, FIG multiple light pen identification means;

[0026] 图3是本发明多光笔识别装置中直流光笔的结构示意图; [0026] FIG. 3 is a schematic diagram of the present invention, multiple light pen recognition apparatus modulated light pen;

[0027] 图4是本发明识别装置中信号处理电路的结构原理框图; [0027] FIG. 4 is a schematic block diagram showing a configuration recognition apparatus according to the present invention, the signal processing circuit;

[0028] 图5是当本发明第一指点光笔的交变周期为CXD摄像机扫描周期的2倍,交变周期的占空比为1 : 1,且交流指点光笔的交变跳跃点和CCD扫描周期起始点同步时,CCD扫描输出信号经过放大电路和高速比较电路后指点光笔像的分布情况示意图; [0028] FIG. 5 is pointing when the first light pen of the present invention is the alternating cycle is twice CXD camera scanning period, the duty ratio of the alternating period is 1: 1, and the AC alternating pointing stylus and a CCD scanning point jumps when starting the cycle sync, CCD scanning circuit output signal after amplification and high-speed comparison circuit schematic diagram of the distribution of the light pen pointing image;

[0029] 图6是当本发明第一指点光笔的交变周期为C⑶扫描周期的3倍,占空比为1 : 2 的情况下CCD扫描输出信号经过放大电路和高速比较电路后指点光笔像的分布情况示意图, [0029] FIG. 6 is pointing when the first light pen of the present invention is 3 times the period of the alternating C⑶ scanning period, the duty ratio is 1: CCD scanning output signal in the case 2 after the high-speed amplifier and comparator circuit as a pointing stylus a schematic view of the distribution,

[0030] 其中,(a)是第一指点光笔在直流指点光笔的右边且多光笔识别模块每三个CXD 扫描周期只检测到一次交流光笔像的情况点光笔;(b)是第一指点光笔在直流指点光笔的左边且多光笔识别模块每三个CCD扫描周期只检测到一次交流光笔像的情况;(c)是第一指点光笔在直流指点光笔的右边且多光笔识别模块每三个CCD扫描周期检测到两次交流光笔像的情况;(d)是第一指点光笔在直流指点光笔的左边且多光笔识别模块每三个CCD 扫描周期检测到两次交流光笔像的情况; [0030] wherein, (a) is a first pointing the light pen to the right of the DC pointing stylus and a plurality of light pen recognition module every three CXD scan period is detected only once the AC light pen image of point light pen; (b) is a first pointing stylus the left DC pointing stylus and a plurality of light pen recognition module every three CCD scanning period only detected the primary alternating light pen image; (c) is a first pointing light pen on the right DC pointing stylus and a plurality of light pen recognition module per three CCD It detects that the scanning period twice the AC image light pen; (d) is a first left pointers pointing stylus and stylus pen recognition module where multiple optical CCD scanning period every three alternating light pen is detected twice in a DC image;

[0031] 图7是本发明识别控制电路中多光笔识别模块的工作原理图。 [0031] FIG. 7 is a control circuit of the present invention to identify operating principle of a multi-stylus identification module. 具体实施方式 Detailed ways

[0032] 如图1所示,交流指点光笔包括发光体、接触式开关13、交变光控制电路17、电源管理电路14、电池15和笔壳16。 [0032] 1, AC pointing stylus including a light emitter, a contact switch 13, alternating light control circuit 17, the power management circuit 14, a battery 15, and the pen housing 16. 其中发光体又包括导光棒11和光源12,发光体的前端置于笔壳16外。 Wherein the light emitter further comprises light guiding rod 11 and the light source 12, a light emitter disposed outside the front end of the pen housing 16. 笔壳16前端设有与发光体尺寸匹配的开孔。 Pen housing 16 is provided with a front end openings match the dimensions of the luminous body. 发光体置于该开孔中,并可以沿开孔的轴向活动;电池15、电源管理电路14、交变光控制电路17和接触式开关13置于笔壳16内;电池15和电源管理电路14相连接;交变光控制电路17分别与电源管理电路14 和光源12相连;光源12的发光端和导光棒11固定粘连;光源12的另一端连接一个接触式开关13,接触式开关13与交变光控制电路17的开关靠近,随着发光体可以沿开孔的轴向活动,在接触式开关13的作用下使得交变光控制电路17的开关能够断开或闭合。 Emitter disposed in the openings, and the openings can be moved axially activities; battery 15, the power management circuit 14, alternating light control circuit 17 and the switch contact 13 disposed within the pen housing 16; a battery and power management 15 circuit 14 is connected; alternating light control circuit 17 are connected to the power management circuit 14 and a light source 12; a light emitting end of the light source 12 and the light guide rod 11 is fixed adhesion; the other end of the light source 12 is connected to a proximity switch 13, the contact switch 13 with alternating light control circuit 17 switches close, along with the emitter openings can be axially activities, such alternating light switch control circuit 17 can be opened or closed under the action of the proximity switch 13.

[0033] 本发明使用了上述交流指点光笔的多光笔识别装置如图2所示,包括第一指点光笔1、第二指点光笔2、书写屏幕3、摄像机4和信号处理电路5。 [0033] The present invention uses the plural light pen identification means AC pointing stylus shown in Figure 2, light pen 1 comprises a first pointer, the second pointer 2 light pen, writing screen 3, the camera signal processing circuit 4, and 5. 其中,第一指点光笔1为交流指点光笔,与书写屏幕3接触时发出交流光6 ;第二指点光笔2为直流指点光笔,与书写屏幕3接触时发出直流光7。 Wherein the first referral pointing light pen stylus AC 1, AC light 6 emitted upon contact with the writing screen 3; light pen stylus pointing DC 2, DC light 7 emitted upon contact with the second writing screen 3 pointers. 摄像机4镜头对准书写屏幕3的法线方向,以对整个屏幕成像。 4 camera lens to the normal direction of the writing screen 3 in order to image the entire screen. 交流指点光笔和直流指点光笔与书写屏幕3接触所产生的光入射到摄像机4,摄像机4 与信号处理电路5连接。 Pointing AC and DC light incident on the light pen pointing stylus in contact with the writing screen 3 is generated to the camera 4, the camera 4 connected to the signal processing circuit 5.

[0034] 对于第一指点光笔1 (即交流指点光笔),接触式开关13通常采用的是一个弹簧。 [0034] 1 to the first light pen pointer (i.e., light pen pointing AC), is a switch spring contact 13 is generally employed. 交变光控制电路17的作用是控制交流指点光笔1的光源12产生交变形式的光。 Alternating the role of the light control circuit 17 is controlled AC source 1 pointer light pen 12 generates an alternating light form. 作为本发明的一种实施方式,交变光控制电路17为方波产生电路,该方波产生电路的核心是一片德州仪器公司生产的MSP430单片机和一个场效应管,该单片机的型号是M430F1232。 As an embodiment of the present invention, the light control circuit alternating square wave generating circuit 17, the square wave generating circuit core is one produced by Texas Instruments MSP430 microcontroller and a FET, the microcontroller model is M430F1232. 电池15 采用一节七号干电池,电压为1. 5V。 Battery 15 using an AAA batteries, voltage of 1. 5V. 电源管理电路14的核心是一片ON Semiconductor公司生产的电源管理芯片,型号是NCP1400ASN33T1,可将干电池1. 5V的输入电压升高到3. 3V 输出,分别给MSP430单片机和光源12提供工作电压。 Core power management circuit 14 is an ON Semiconductor chip power management company, the model is NCP1400ASN33T1, the battery can 1. 5V input voltage of 3. 3V to increase the output, respectively, to the MSP430 microcontroller operating voltage and the light source 12. 交流光笔的光源12采用功率为5mw 的红外半导体激光器,使用红外光源可减少环境光的干扰,从而提高系统工作的稳定性和精度。 Light pen AC power source 12 uses an infrared semiconductor laser 5mw using an infrared light source may reduce the interference of ambient light to enhance the stability and accuracy of system operation. 此外,交流指点光笔1的发光,除了方波形式的光6,本发明的交变光控制电路17也可为正弦波产生电路而产生正弦等交变形式的光,或其他交变形式的光。 Further, AC pointing light pen emitting 1, except that a square wave form of light 6, alternating the present invention the light control circuit 17 may also be a sine wave generating circuit generates an alternating form of a sine like light, or other alternate form of light .

[0035] 当交流指点光笔1和屏幕接触3时,导光棒11和光源12推动弹簧使方波产生电路17的开关闭合,单片机在电源管理电路14提供的电压下开始工作,单片机交替调用两个延时函数,在不同延时时间内,在单片机的I/O 口分别输出高低电平,这两个延时函数的延时时间之比即方波的占空比。 [0035] When the AC pointing light pen 1 and the screen 3 contact 12 pushes the spring of the light guide rod 11 and the light source so that the square wave generating switch closed circuit 17, the microcontroller starts working at a voltage of the power management circuit 14, the microcontroller alternately call two a delay function, at different delay time, the microcontroller I / O port outputs high and low, i.e., the duty cycle of the square wave than the delay time of two delay function. 单片机的I/O 口连接到方波产生电路的场效应管的栅极,场效应管的漏极通过一个限流电阻连接到光源的负极,光源的正极连接到3. 3V电压,场效应管源极接地,场效应管的型号选择2N7002,这样利用I/O 口交替的高低电平控制场效应管的通断,使交流指点光笔1发出亮暗交替的交流光6。 The gate of the FET microcontroller I / O port connected to the square wave generating circuit, the drain of the FET through a current limiting resistor connected to the positive source of the negative electrode, is connected to the source voltage of 3. 3V, FET source grounded, and the choice of type 2N7002 FET, so that the use of I / O port alternating high and low control FET off, the AC 1 emits light pen pointing alternating bright and dark alternating light 6.

[0036] 对于直流指点光笔,如图3所示,它和交流指点笔的区别在于没有交变光控制电路17,而电源管理电路24直接和光源22相连,接触式开关23靠近电源管理电路24的开关。 [0036] For DC pointing stylus, shown in Figure 3, the difference between it and the exchange is that there is no pointing pen alternating light control circuit 17, and the power management circuitry 24 and the light source 22 is directly connected, the switching contact 23 near the power management circuitry 24 switch. 当该直流指点光笔和屏幕3接触时,导光棒21和光源22推动弹簧23使电源管理电路24的开关闭合,电源管理电路24提供恒定的工作电压给直流指点光笔光源22,直流指点光笔发出亮度恒定的光7。 When contacting the DC pointing light pen and the screen 3, the light guide rod 21 and the light source 22 urging spring 23 so that the power management circuit switch 24 is closed, the power management circuit 24 supplies a constant operating voltage to 22, the DC pointing stylus DC pointing light pen light source 7 constant brightness light.

[0037] 作为本发明的一种实施方式,在本发明的多光笔识别装置中,摄像机4可采用线阵CXD摄像机,且CXD芯片通常沿水平方向放置。 [0037] As an embodiment of the present invention, in an optical multi-pen recognition apparatus according to the present invention, the camera 4 can be linear array camera CXD and CXD chip is usually placed in the horizontal direction. CXD芯片可采用SONY公司生产的线阵(XD,型号是ILX511。信号处理电路5如图4所示,包括依次串联的放大电路53、高速比较电路52和识别控制电路51。其中识别控制电路51又包括CCD驱动模块511和多光笔识别模块512。识别控制电路51的核心是一片altera公司生产的CPLD芯片,采用的型号是EPM1270T144。放大电路53可采用运放芯片TL084,实现反向放大。高速比较电路52可采用凌特公司生产的比较器芯片,型号是LT1016,高速比较电路52可将模拟信号转化为CPLD 可处理的数字信号。CXD驱动模块511和多光笔识别模块512都是利用Verilog硬件描述语言,在CPLD芯片内通过编程实现。根据CXD芯片数据手册上的驱动波形编写CXD驱动模块511,并与CXD摄像机连接。多指点光笔识别模块512与高速比较电路52连接。若上述CCD摄像机自带驱动,则识别控制电路51中无需设置CCD驱动模块511。 CXD chip can be produced by SONY linear array (XD, model is ILX511. The signal processing circuit 5 shown in Figure 4, including the amplifier circuit 53 in series, a high-speed comparator circuit 52 and the discrimination control circuit 51. The control circuit 51 wherein the identifying CCD driver module 511 also includes a light pen and a plurality of identification recognition module 512. the control core circuit 51 is a altera CPLD chip produced by using the model is EPM1270T144. amplifying circuit chip TL084 operational amplifier 53 may be employed, the inverting amplifier to achieve high speed Linear comparator circuit 52 can be produced from the comparator chip, a model LT1016, a high-speed comparator circuit 52 converts the analog signal into a digital signal .CXD CPLD driver module 511 may process the light pen and the multi-identification module 512 is using Verilog hardware description language, implemented within CPLD chip by programming. prepared CXD driving module 511 according to the driving waveform on the CXD chip data sheet, and connected to the CXD camera multi-pointing stylus identification module 512 is connected to a high-speed comparator circuit 52. when the above-described CCD camera from tape drive, the control circuit 51 without identifying the CCD driver module 511 is provided.

[0038] 本发明基于CXD的多光笔识别装置的工作过程主要包括以下主要步骤: [0038] Based on the work process of a multi-CXD light pen recognition apparatus of the present invention includes the following main steps:

[0039] 1. CXD驱动模块511的输出信号输入到CXD摄像机,CXD摄像机开始工作。 [0039] 1. CXD drive module output signal 511 is input to the camera CXD, CXD camera work.

[0040] 2.当第一指点光笔1 (为交流指点光笔)和第二指点光笔2 (为直流指点光笔)同时在屏幕3上操作时,第一指点光笔1发出亮度呈方波形式的交流光6,第二指点光笔2发出亮度恒定的直流光7。 [0040] 2. When the first pointing stylus 1 while in operation on the screen 3, a first pointer light pen 1 emitted alternating luminance as a square wave form (AC pointing light pen) and a second pointing light pen 2 (DC pointing stylus) light 6, a second pointer luminance of emitted light pen 2 constant DC light 7.

[0041] 3.第一指点光笔1和第二指点光笔2发出的光经过导光棒11和导光棒21,在书写屏幕3上形成两个光斑,经过CCD摄像机扫描,完成光信号到电信号的转换。 [0041] 3. The first and the second pointer pointing a light pen stylus 2 through the light emitted from the light guiding rod 11 and the light guide rod 21, two light spots are formed on the writing screen 3, after the scan CCD camera, to complete the optical signal to an electrical conversion signal.

[0042] 4. CXD的扫描输出信号通过信号处理电路5上放大电路53的反向放大,再经过高速比较电路52,转化为识别控制电路51可处理的数字信号,输出到识别控制电路51的多光笔识别模块512。 Scan output signal [0042] 4. CXD amplifier inverting amplifier circuit 53 via the signal processing circuit 5, and then through the high-speed comparator circuit 52, converted to a digital signal identifying the control circuit 51 can be processed, the control circuit 51 outputs to the recognition of multi-recognition module 512 light pen.

[0043] 5.多光笔识别模块512分析输入信号,对多指点光笔进行识别。 [0043] The plurality of light pen recognition module 512 analyzes the input signal, multi-pointing stylus identification.

[0044] 多光笔识别模块512实现多光笔识别的原理为:将CXD摄像机中CXD芯片安装在水平方向,交流指点光笔和直流指点光笔在书写屏幕3上形成的两个光斑经过CCD摄像机4的光学系统后成像在CXD芯片上,且这两个像是竖直方向上的两条亮线,若两支指点光笔在水平方向的位置不同,则这两条亮线相互平行,且都与线阵CCD芯片垂直相交,表现在CCD的输出信号为对应两条亮线的位置点的电压降低,CCD输出信号的时间轴对应的就是CXD芯片方向的位置。 [0044] The principle of the multi light pen recognition module 512 multi-stylus identified as: the CXD camera CXD chip is mounted in a horizontal direction, two spots AC pointing stylus and DC pointing light pen is formed on the writing screen 3 through the CCD camera optics 4 CXD imaged on the system chip, and these two like two bright lines in the vertical direction, if the two light pen pointing in different positions in the horizontal direction, then these two bright lines parallel to each other, and both the linear array perpendicular to the CCD chip, reflected in the output signal of the CCD is reduced to a voltage corresponding to the position of the bright line two points, a time axis corresponding to the CCD output signal is the location of the chip CXD direction. 由此可见,指点光笔在屏幕3上的位置对应着亮线与CXD相交位置, 如果能区分两支指点光笔的亮线与CCD的相交位置(在CCD输出信号中以相对扫描周期起始点至检测到亮线的时间N来表示这个位置)则可实现屏幕3上的两支指点光笔的识别。 Thus, a pointing stylus and a bright line corresponding CXD intersection position on the screen 3, if a pointing stylus can distinguish two bright lines intersect the CCD position (CCD output signal relative to the scan starting point to the detecting period bright line to represent two pointers to N times the light pen on the screen 3 recognizes this position) can be achieved.

[0045] 若线阵CXD的扫描周期为T,交流指点光笔的方波占空比为1 : 1,交变周期为2T, 方波的跳变处和线阵CCD扫描周期起始点同步,直流指点光笔和交流指点光笔在书写屏幕3上都没有移动,两条亮线分别与CXD的相交位置始终不变,即m = N2。 [0045] When the linear CXD scanning period is T, the pointing pen-AC square wave duty ratio of 1: 1, an alternating cycle of 2T, and starting at the transition line CCD scan cycle of the square wave synchronous, DC alternating pointer pointing light pen and the pen are not moved on the writing screen 3, respectively, and two bright line of intersection CXD remains unchanged, i.e., m = N2. 通过分析CXD的输出信号,如图5所示,检测到亮线的位置分为m和N3两种情况,其中m对应亮线P1、P2、 P4、P5,N2对应亮线P3、P6,其中位置附始终有亮线,可认定该位置附对应为直流指点光笔2与屏幕接触的位置;而位置N3的亮线只在T2和T4周期内交替出现,位置N3对应为交流指点光笔与屏幕接触的位置。 CXD analysis of the output signal, shown in Figure 5, the detected position of the bright line is divided into two cases m and N3, wherein m corresponds to the bright line P1, P2, P4, P5, N2 corresponding to bright lines P3, P6, wherein position is attached always bright lines can be determined that the position is attached corresponding to the position current pointer light pen 2 into contact with the screen; the position N3 bright lines appear alternately only in the period T2 and period T4, position N3 corresponding to the contact for the exchange of the pointing stylus and screen s position. 此时在两个扫描周期内即可识别出指点光笔,实现多光笔的快速识别。 At this time, in two scanning periods can be recognized pointing stylus, light pen rapid identification of multiple.

[0046] 本发明若将第一指点光笔1的方波占空比调整为1 : 2、交变周期相应调整为3T,也可以实现快速识别多光笔。 If [0046] the present invention, the first light pen pointing square wave duty cycle is adjusted to 1: 2, adjusted alternating periods of 3T can be achieved quickly identify multiple light pen. 此时高电平持续时间为T,低电平持续时间为2T。 At this time, the high level duration T, the low level duration of 2T. 其原理如下:在CCD的扫描周期内检测到亮线用1表示,没有检测到亮线用0表示,则根据比较电压以及方波跳变时间相对于CCD扫描周期起始时间的不同,会出现100100100……或者110110110……这两种情况,也就是100或110这两种状态循环出现,当直流指点光笔和交流指点光笔同时存在时,以摄像机所在的位置朝屏幕的方向看,当直流指点光笔在交流指点光笔的左边时,CCD输出信号有如图6所示的(a)和(C)两种可能的情况;当直流指点光笔在交流指点光笔的右边时,CCD输出信号有如图6所示的(b)和(d)两种可能的情况。 The principle is as follows: 1 is detected by the bright line indicates, the bright line is not detected is represented by 0, based on the comparison voltage and the square wave transition time with respect to different scan period start time of the CCD in the scanning period of the CCD, will be 100 100 100 110 110 110 ...... ...... or both cases, i.e. the two states 100 or 110 cycles occurs, when the AC and DC light pen pointer pointing stylus exist, in order to see the position of the camera is located in the direction toward the screen, when the DC pointing light pen is left AC pointing stylus, CCD output signals are two possible cases (a) and (C) shown in Figure 6; when the DC pointing the light pen on the right of the AC pointing stylus, CCD output signals in FIG. 6 shown in (b) and (d) two possible scenarios. 其中,(a)是交流指点光笔在直流指点光笔的右边且多光笔识别模块每三个CCD扫描周期只检测到一次交流光笔像的情况;(b)是交流指点光笔在直流指点光笔的左边且多光笔识别模块每三个CCD扫描周期只检测到一次交流光笔像的情况;(c)是交流指点光笔在直流指点光笔的右边且多光笔识别模块每三个CCD扫描周期检测到两次交流光笔像的情况;(d) 是交流指点光笔在直流指点光笔的左边且多光笔识别模块每三个CCD扫描周期检测到两次交流光笔像的情况;无论是哪种情况,连续三个CCD扫描周期内都会至少出现一次相邻两个扫描周期内,多光笔识别模块512在其中一个扫描周期内检测到单个指点光笔,而在相邻的另一个扫描周期内检测到两个指点光笔。 Wherein, (a) is a case where AC pointing the light pen on the right DC pointing stylus and a plurality of light pen recognition module every three CCD scanning period is detected only once the AC light pen image; (b) is an AC pointing stylus in the left DC pointing stylus and multi light pen identification module every three CCD scanning period only detected the primary alternating light pen image; (c) an alternating pointing stylus to the right of the DC pointing stylus and a plurality of light pen recognition module every three CCD scanning period is detected twice AC light pen where image; (d) is a case where the exchange of the pointing light pen on the left DC pointing stylus and a plurality of light pen recognition module every three CCD scanning period is detected twice the AC light pen image; either case, three consecutive CCD scanning period It will appear at least once within the adjacent two scanning periods, multiple light pen recognition module 512 in a scan period where a single pointer detection light pen, is detected in the two adjacent light pen pointer another scan. 考虑到指点光笔使用过程中必然会移动, 但由于CCD扫描周期很小,作为本发明的一种实施方式,设为5ms,在相邻扫描周期这样一个极短的时间内,指点光笔移动的距离有限,因此可以假定在相邻CCD扫描周期内,检测到的同一支指点光笔的位置变化不大,如果在扫描周期内检测到两个指点光笔且其中一个指点光笔的位置比另一个指点光笔的位置更接近相邻的扫描周期内检测到的单个指点光笔的位置,因为单个指点光笔的位置必然为直流指点光笔的位置,所以两个指点光笔中更接近单个指点光笔位置的那个指点光笔为直流指点光笔,另一个指点光笔为交流指点光笔。 Considering the process of using a light pen pointing inevitably moves, but the small CCD scanning period, as an embodiment of the present invention, it is assumed 5ms, adjacent scan period in such a short period of time, the light from the pointing pen movement is limited, it can be assumed that in the adjacent CCD scanning period, not the position of the detected change with a pointing stylus, if it is detected two pointer light pen in the scanning period and wherein a pointing stylus position than the other pointing stylus a position closer to a single location pointing stylus detected by an adjacent scanning period, as a single location pointing stylus necessarily direct current position of the pointing stylus, the two pointing stylus is closer to the pointer light pen single pointing stylus position DC pointing light pen, the other pointing light pen light pen pointing to the exchange. 若高速比较电路52的比较电压小于亮线最亮点在T/2时间内所积累的电荷经CCD输出并经放大后的电压值,则可进一步避免光笔识别过程中的误判断。 If the high-speed voltage comparator comparison circuit 52 is smaller than the charge in the bright lines highlight the T / 2 time accumulated by the CCD and output the amplified voltage value can be further avoid misjudgment light pen recognition process.

[0047] 在多光笔识别模块512中对经过放大电路53和高速比较电路52的CXD输出信号进行检测,由于经过了反向放大和高速比较,亮线位置对应的电信号为一个高电平。 [0047] The amplifying circuit 53 is detected through the optical multi-pen recognition module 512 and the output signal CXD high speed comparator circuit 52, because after the high-speed electric signal of the inverting amplifier and comparator, bright line position corresponding to a high level. 考虑到只需要进行多光笔识别,可以将检测亮线的位置简化为检测高电平上升沿的位置。 Taking into account only a multi-stylus identification, can simplify the detection position to detect a bright line of a high edge location. 在CCD 的扫描周期开始时以CCD输出像素的时钟频率计数,计数器中的值M就代表像素数,也即CXD芯片方向上的位置。 At the beginning of the scan period of the CCD clock frequency counting CCD output pixel, the counter value M represents the number of pixels, i.e. the position in the direction of chip CXD.

[0048] 当交流指点光笔的方波占空比为1 : 2,且交变周期为3T时,多光笔识别模块512的工作过程如图7所示,CCD扫描周期开始时计数器I和计数器II开始计数。 [0048] When the pointing pen-AC square wave duty cycle of 1: 2, and the alternating cycle is 3T, multiple light pen identification process 512 of the module shown in Figure 7, at the beginning of a scan cycle counter CCD counter I and II start counting. 若没有检测到高电平,一直等到CCD扫描周期结束,计数器I和计数器II清零,然后开始下一周期的检测;若检测到高电平,则计数器I停止计数,继续检测高电平,如果再次检测到高电平,也就是这一扫描周期内有两条亮线,此时计数器II停止计数,保存计数器I中的值Ml和计数器II中的值M2,分别对应第一条亮线和第二条亮线的位置,并将同一扫描周期存在两条亮线的周期数m加1,然后等到CCD扫描周期结束,计数器I和计数器II清零,开始下一周期的检测;如果没有再检测到高电平,即这一周期只有一条亮线,则进行判断,如果这个CCD扫描周期之前的一个周期没有检测到两条亮线,即m = 0,则还无法进行判断,等到CCD扫描周期结束,计数器I和计数器II,然后开始下一周期的检测;若m不为0,保存这一扫描周期计数器I中的值M3,此时可实现两支指点光笔的识别 If the high level is not detected, wait until the end of the CCD scanning period, the counter I and II counter is cleared, and the next cycle starts to detect; if it is detected high, the counter stops counting I, continue to detect a high level, If the high level is detected again, i.e. there are two bright lines in the scan period, this time counter stops counting II, I counter value is stored in the counter II value in the Ml and M2, respectively corresponding to the first bright line and a second position of the bright line, bright line and there are two cycles of the same scan plus 1 m, and then wait until the end of the CCD scanning period, the counter I and II counter is cleared, the next cycle starts to detect if any; detected again to the high level, i.e., only one cycle of the bright line, it is judged if a preceding cycle of the CCD scanning period two bright lines is not detected, i.e., m = 0, it can not be determined, until the CCD scanning period ends, the counter I and II the counter, and then starts to detect the next cycle; if m is not 0, the value stored scan cycle M3 the counter I is, at this time two pointing stylus may be implemented to identify :当|M3-M1 < |M3-M2时,可认为M3 和Ml为同一指点光笔的位置,而M3是CCD扫描周期中只有一条亮线时亮线的位置,对应的必为直流指点光笔2的位置,所以Ml也为直流指点光笔2的位置,M2则为交流指点光笔的位置;否则,可认为M3和M2为同一指点光笔的位置,同样M2必对应直流指点光笔的位置, 所以Ml对应交流指点光笔的位置,M2对应直流指点光笔的位置,至此,我们实现了对两支指点光笔同时使用时的识别。 : When | M3-M1 <| when M3-M2, may be considered M3 and Ml same position pointing stylus, and M3 is the position of the bright lines when the CCD scan period only a bright line corresponding to a necessary DC pointing stylus 2 position, so Ml also direct the pointing stylus position 2, M2 compared with the position of the AC pointing stylus; otherwise, may be considered M3 and M2 are the same pointing stylus position, the same M2 will correspond to the position of the DC pointing stylus, so Ml corresponds alternating the position of the pointing stylus, M2 corresponding to the current pointer position of the light pen, so far, we achieved when using simultaneously recognize two pointers light pen.

[0049] 当摄像机采用线阵CXD摄像机且两支指点光笔在水平方向上坐标相同时,两支指点光笔的亮线重合,无法进行区分,此时,可增加一个线阵CCD摄像机,以屏幕法线方向为旋转轴,相对原来的CCD摄像机旋转90度,这样可以在竖直方向对两支指点光笔进行区分。 [0049] When using the linear array camera, and two pointers CXD camera coordinates with the same light pen, pen-pointing two bright lines coincide in the horizontal direction, can not be distinguished, at this time, a linear CCD camera may be increased, to screen method line direction as a rotation axis relative to the original CCD camera rotated 90 degrees, which can distinguish between two light pen pointing in the vertical direction.

[0050] 作为本发明的另一种实施方式,第二指点光笔2也可以为交流指点光笔。 [0050] As another embodiment of the present invention, the second optical pointing pen 2 may be a light pen pointing exchange. 此外,为实现更多用户同时操作,可以增加交流指点光笔的数量。 Further, to achieve more simultaneous users can increase the number of AC pointing stylus. 对于以上这两种情况,都需要满足各支交流指点光笔之间交变周期或者占空比不同。 For the above two cases, are required to meet each branch exchanges pointers between the alternating cycles or duty cycle is different from the light pen. 与第二指点光笔2为直流指点光笔的情况同理,不同交变周期或占空比的两支交流指点光笔,在摄像机输出信号中检测到的交流指点光笔像的分布情况不同,根据交变周期或占空比的具体值以及检测到的交流指点光笔像的分布,可以区分多支交流指点光笔。 Alternating with two second pointer pointing stylus pen 2 is the case where DC light pointing stylus Similarly, different duty cycles or alternating, different from the distribution of the detected signal in the camera output AC light pen pointing image, according to the alternating or specific period and detecting the duty ratio of the alternating distribution of the light pen pointing image, the multi-branching can be distinguished AC pointing stylus.

Claims (8)

  1. 一种交流指点光笔,包括笔壳(16)、电池(15)、电源管理电路(14)、接触式开关(13)和发光体,所述电池(15)和电源管理电路(14)电连接,所述发光体包括光源(12)和导光棒(11),光源(12)的发光端和导光棒(11)固定连接,光源(12)的另一端和接触式开关(13)固定连接,笔壳(16)的前端设有与发光体相匹配的开孔,所述发光体置于该开孔中,所述导光棒(11)的前端置于笔壳(16)外,所述电池(15)、电源管理电路(14)和接触式开关(13)置于笔壳(16)内,其特征是:所述笔壳(16)内还设有交变光控制电路(17),该交变光控制电路(17)分别与电源管理电路(14)和光源(12)电连接,接触式开关(13)与交变光控制电路(17)的开关靠近。 An AC pointing stylus including a pen housing (16), battery (15), the power management circuit (14), a contact switch (13) and emitter, said battery (15) and a power management circuit (14) electrically connected , said light emitter comprises a light source (12) and the light guide rod (11), a light source (12) emitting end and a light guide rod (11) is fixedly connected, a light source (12) and the other end of the contact switch (13) is fixed connecting tip pen casing (16) is provided with an opening that matches the light emitter, the light emitter disposed in the opening, the front end of the light guide rod (11) is placed outside the pen housing (16), said battery (15), the power management circuit (14) and a contact switch (13) is placed in the pen housing (16), characterized in that: said pen housing (16) is also provided with alternating light control circuit ( 17), the alternating light control circuit (17) are electrically connected to the power management circuit (14) and the light source (12), a contact switch (13) with alternating light control switch circuit (17) close.
  2. 2. 一种使用权利要求1所述交流指点光笔的多光笔识别装置,其特征是:包括发射装置、接收装置和书写屏幕(3),所述发射装置和接收装置置于书写屏幕(3)的同一侧或分置于书写屏幕(3)的两侧,所述发射装置包括第一指点光笔(1)和第二指点光笔(2),所述接收装置包括相互电连接的摄像机(4)和信号处理电路(5);所述摄像机(4)的镜头对准屏幕⑶的法线;所述信号处理电路(5)包括依次串联的放大电路(53)、高速比较电路(52) 和识别控制电路(51),所述识别控制电路(51)含有多光笔识别模块(512);所述第一指点光笔(1)为交流指点光笔。 Multi alternating light pen identification means pointing the stylus 2. A use as claimed in claim 1, characterized in that: a transmitting means, receiving means and writing screen (3), said transmitting means and receiving means disposed writing screen (3) points placed on the same side or writing screen (3) on both sides, said first transmitting means comprises a light pen pointer (1) and the second light pen pointer (2), said receiving means comprises electrically camera (4) connected and a signal processing circuit (5); the normal line of the camera (4) of the lens to the screen ⑶; said signal processing circuit (5) comprises in series an amplifier circuit (53), a high speed comparator circuit (52) and the identification the control circuit (51), the discrimination control circuit (51) comprising multiple light pen identification module (512); the first pointer light pen (1) for the exchange of the pointing stylus.
  3. 3.根据权利要求2所述的多光笔识别装置,其特征是:所述第二指点光笔(2)为直流指点光笔。 The multi-stylus recognition apparatus according to claim 2, wherein: said second light pen pointer (2) is a DC pointing stylus.
  4. 4.根据权利要求2所述的多光笔识别装置,其特征是:所述第二指点光笔(2)为交流指点光笔。 The multi-stylus recognition apparatus according to claim 2, wherein: said second light pen pointer (2) for the exchange of the pointing stylus.
  5. 5.根据权利要求4所述的多光笔识别装置,其特征是:所述第二指点光笔(2)和第一指点光笔⑴的交变周期或占空比不同。 The multi-optical pen recognition apparatus according to claim 4, characterized in that: the second different light pen pointer (2) and the first light pen pointing ⑴ alternating cycles or duty cycle.
  6. 6.根据权利要求2所述的多光笔识别装置,其特征是:所述识别控制电路(51)包括摄像机驱动模块(511)和多光笔识别模块(512),摄像机驱动模块(511)与摄像机(4)电连接,多光笔识别模块(512)与高速比较电路(52)电连接。 6. The multi-stylus recognition apparatus according to claim 2, characterized in that: said discrimination control circuit (51) comprises a camera drive module (511) and a plurality of light pen identification module (512), the camera driver module (511) and the camera (4) is electrically connected to the optical multi-pen recognition module (512) the high speed comparator circuit (52) is electrically connected.
  7. 7. 一种使用权利要求3所述的多光笔识别装置进行多光笔识别的方法,其特征是包括如下步骤:(1)摄像机(4)开始工作;(2)将第一指点光笔(1)和第二指点光笔(2)同时与书写屏幕(3)接触,以使第一指点光笔(1)和第二指点光笔(2)的光源开始发光,所述第一指点光笔(1)发出交流光,所述第二指点光笔(2)发出直流光。 A use as claimed in claim multiple light pen recognition apparatus 3 according to a method of identifying multiple light pen, characterized by comprising the steps of: (1) a camera (4) to work; (2) the first pointer light pen (1) and a second pointing light pen (2) at the same time (3) in contact with the writing screen, a pointing light pen so that the first (1) and the second light pen pointer (2) of the light source starts emitting light, the first light pen pointer (1) issued AC light, the second light pen pointer (2) direct emitted light. (3)第一指点光笔(1)和第二指点光笔(2)发出的光入射到摄像机(4)并转换成电信号;(4)摄像机将所述电信号输入到信号处理电路的放大电路(53)进行放大,放大后的电信号经高速比较电路(52)输入到识别控制电路(51)的多光笔识别模块(512)。 The amplifier circuit (4) the electrical signal input to the camera signal processing circuit; incident light (3) first pointer light pen (1) and the second light pen pointer (2) sent to the camera (4) and converted into an electrical signal (53) amplifies the electric signal amplified by the high-speed comparator circuit (52) to the multi-stylus input recognition module (512) identifying a control circuit (51). (5)多光笔识别模块(512)检测第一指点光笔(1)和第二指点光笔(2)的位置,并得到同一摄像机(4)的扫描周期内所检测到的指点光笔的个数;(6)在摄像机(4)的相邻两个扫描周期内,若多光笔识别模块(512)在其中一个扫描周期内检测到单个指点光笔,而在相邻的另一个扫描周期内检测到两个指点光笔,则执行步骤⑵;(7)若多光笔识别模块(512)在步骤(5)中的一个摄像机(4)的扫描周期内检测到两个指点光笔且其中一个指点光笔的位置比另一个指点光笔的位置更接近相邻的扫描周期内检测到的单个指点光笔的位置,则更接近单个指点光笔位置的那个指点光笔为直流指点光笔,另一个指点光笔为交流指点光笔。 Position detecting first pointer light pen (1) and the second pointing light pen (2) (5) multiple light pen identification module (512), and obtains the number of the pointing stylus in the same camera (4) of the scanning period detected; (6) in the adjacent two scanning periods cameras (4), if the multi-optical pen recognition module (512) in a scan period where a single pointer detection light pen, is detected in the adjacent two scanning periods other a pointing light pen, step ⑵; (7) If several light pen identification module (512) in step a camera (4) (5) of the scan cycle detects two positions pointing stylus and wherein a pointing stylus ratio position of the other pointing stylus is closer to a single location pointing stylus detected by an adjacent scanning period is closer individual that pointing stylus pointing light pen position to direct the pointing light pen, other pointing pen-AC pointing stylus.
  8. 8.根据权利要求7所述的进行多光笔识别的方法,其特征是:所述第一指点光笔(1) 的交变周期为所述摄像机(4)的扫描周期的2〜3倍,每个所述交变周期的占空比为1 : 1 〜2。 8. The method of identification is a multi-stylus as claimed in claim 7, wherein: said first pointing light pen (1) in an alternating cycle of the camera (4) is 2 to 3 times the scanning cycle, each a period of the alternating duty cycle of 1: 1 ~ 2.
CN 201010143736 2010-04-09 2010-04-09 Alternating current pointing light pen, multi-light-pen identification device and method of multi-light-pen identification CN101819476A (en)

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