CN202166975U - Synchronous light pen electronic whiteboard system - Google Patents
Synchronous light pen electronic whiteboard system Download PDFInfo
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- CN202166975U CN202166975U CN2011200970211U CN201120097021U CN202166975U CN 202166975 U CN202166975 U CN 202166975U CN 2011200970211 U CN2011200970211 U CN 2011200970211U CN 201120097021 U CN201120097021 U CN 201120097021U CN 202166975 U CN202166975 U CN 202166975U
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Abstract
The utility model discloses a synchronous light pen electronic whiteboard system, wherein an image sensor with a global shutter is led in a signal receiving device; a light pen has a pulse lighting; meanwhile, a synchronous signal emitter and a synchronous signal receiver are led in the light pen; the pulse lighting of the light pen is overlapped to an exposure time of the image sensor by a synchronous signal so as to improve a signal to noise ratio; the synchronous signal emitter can be arranged in the light pen, and the synchronous signal receiver can be positioned in the signal receiving device; or the synchronous signal emitter can be positioned in the signal receiving device, and the synchronous signal receiver is arranged in the light pen; both proposals can ensure a lighting pulse time to overlap the exposure time, thus realizing purpose of the utility model. By adopting the proposal of the utility model, the power consumption of the light pen can be reduced effectively, and the signal to noise ratio of the system can be promoted effectively.
Description
Technical field
The present invention relates to a kind of electric whiteboard system, especially a kind of synchronous light pen electric whiteboard system that adopts the optical imagery technology.
Technical background
The realization basis of adopting the electric whiteboard system of optical imagery technology is that light pen position is followed the tracks of, and the Chinese invention patent that is called " system and method that is used for computing machine coordinate and control information input " in patent No. ZL011080477, patent of invention publication number CN1305143A, name has detailed description.Its principle of work is: the position that indicates impact point with the luminous point of light pen generation; Introduce the real-time images acquired of camera head; With signal processing circuit real-time analysis picture signal and extract the positional information of luminous point; Be input to computing machine through interface circuit and corresponding software, carry out the physical location that calibrating coordinates makes the Position Tracking light pen of cursor with the coordinate correction algorithm.In order to realize higher signal to noise ratio (S/N ratio); Improve operational reliability, prior art is generally introduced an optical bandpass filter, is used to make the spectral energy of light pen to see through as far as possible; And make the surround lighting energy as far as possible by filtering, perhaps improve signal to noise ratio (S/N ratio) through strengthening luminous power.But the effect that the mode that only adopts optical filter reaches is limited, under certain light pen brightness situation, if surround lighting is stronger, still is easy to take place the light interference phenomenon, and if excessively improve luminous power, then cause power consumption too high, battery exhausts rapidly.Therefore be necessary to seek the high efficiency method of further raising signal to noise ratio (S/N ratio).
Summary of the invention
The purpose of this invention is to provide a kind of synchronous light pen electric whiteboard system that can under the condition that does not increase luminous power, further improve system signal noise ratio.
For achieving the above object; Synchronous light pen electric whiteboard system of the present invention has been introduced the imageing sensor with global shutter in signal receiving device; The light pen pulsed illumination; And introduce synchronous signal transmitter and synchronous signal receiver, the pulsed illumination of light pen and the time shutter of imageing sensor are coincided, thereby reach the purpose that improves signal to noise ratio (S/N ratio) through synchronizing signal.Its concrete technical scheme has two kinds; A kind of scheme is: a kind of synchronous light pen electric whiteboard system, comprise signal receiving device and light pen, and signal receiving device mainly is made up of receiving processing circuit and the camera that is attached thereto; Light pen mainly is made up of Pen point with luminous device and light pen circuit; It is characterized in that in said signal receiving device, having a synchronous signal receiver to be connected to said receiving processing circuit, and the imageing sensor in the described camera be one can overall situation exposure imageing sensor; A corresponding synchronous signal projector is arranged in said light pen, and light pen is luminous with impulse form; Said synchronous signal transmitter is an infrared transmitting tube or radiofrequency emitting module, and said synchronous signal receiver is an infrared receiving module or Receiver Module; Perhaps, said synchronous signal transmitter part and Pen point with luminous device are same infrared transmitting tubes.Another kind of scheme is: a kind of synchronous light pen electric whiteboard system; Comprise signal receiving device and light pen; Signal receiving device mainly is made up of receiving processing circuit and the camera that is attached thereto, and light pen mainly is made up of Pen point with luminous device and light pen circuit, it is characterized in that; Imageing sensor in the described camera be one can overall situation exposure imageing sensor; In said signal receiving device, have a synchronous signal transmitter to be connected to said receiving processing circuit, a corresponding synchronous signal receiver is arranged in said light pen, light pen is luminous with impulse form; Said synchronous signal transmitter is an infrared transmitting tube or radiofrequency emitting module, and said synchronous signal receiver is an infrared receiving module or Receiver Module.
In these two kinds of schemes, synchronizing signal is used so that the pulsed illumination time of the time shutter of imageing sensor and light pen coincides.Like this, the time shutter of supposing each pixel is T_shut, and the IMAQ cycle is T; Surround lighting active strength Ie; Then in the present invention, system signal noise ratio is (T_shut*Ip)/(T_shut*Ie)=Ip/Ie, and the light pen average power consumption is a*Ip*T_shut; Wherein a is a fixed coefficient, and Ip is an average canbdle power in the light pen burst length.And in the prior art, suppose that it is Is that light pen continues luminous intensity, and then signal to noise ratio (S/N ratio) can be expressed as (T_shut*Is)/(T_shut*Ie)=Is/Ie, and the light pen average power consumption is a*Is*T.According to above-mentioned formula, if Ip=Is, T_shut=T/4; Then the present invention is identical on signal to noise ratio (S/N ratio) with existing skill, and the light pen power consumption drops to 25% of prior art, promptly when signal to noise ratio (S/N ratio) is constant; The light pen power consumption can reduce greatly under the system of the present invention, thereby has prolonged the power supply power-on time.If the luminous power during the light pen led pulse among the present invention doubles; Be Ip=Is*2; Same T_shut=T/4; Signal to noise ratio (S/N ratio) can double in the system then of the present invention, and the average power consumption of light pen reduces by 50%, and promptly suitably setup parameter can improve signal to noise ratio (S/N ratio) and the power consumption that reduces pen simultaneously.If under the prerequisite of the gain that improves circuit, further shorten the time shutter, then can further improve the average power consumption of signal to noise ratio (S/N ratio) or reduction light pen.
Adopt after the scheme of the present invention, can effectively reduce the power consumption of light pen and the power-on time that prolongs power supply, also can improve the signal to noise ratio (S/N ratio) of system, thereby effectively improve the result of use of product.It is thus clear that practical significance of the present invention.
Description of drawings
Fig. 1 is the formation synoptic diagram of light pen in the synchronous light pen electric whiteboard system of first embodiment of the present invention.
Fig. 2 is the formation synoptic diagram of signal receiving device among first embodiment of the present invention.
Fig. 3 is the formation synoptic diagram of light pen in the synchronous light pen electric whiteboard system of second embodiment of the present invention.
Fig. 4 is the formation synoptic diagram of signal receiving device among second embodiment of the present invention.
Among the figure: Pen point with luminous device 1, light pen circuit 2, housing 3, synchronous signal receiver 4, camera 5, receiving processing circuit 6, synchronous signal transmitter 7.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
Fig. 1 and Fig. 2 have provided the formation synoptic diagram of a kind of specific embodiment of synchronous light pen electric whiteboard system of the present invention jointly.Pen point with luminous device 1 is an infrared transmitting tube, is positioned at the head of pen and is connected to light pen circuit 2, is positioned at housing 3.This is the common setting of prior art.It is the circuit that core constitutes by common single-chip microcomputer that light pen circuit 2 is one, and under the control of single-chip microcomputer, when light pen was luminous, the width of its led pulse was about 5 milliseconds, and the recurrence interval is about 20 milliseconds, and simultaneously, each pulse is to be modulated on the carrier wave of 38KHz.Synchronous signal receiver 4 is 38KHz infrared receiving modules that a common infrared remote control is used, and it is connected to receiving processing circuit 6.When the light pen led pulse arrives, because the effect of 38KHz carrier wave, described infrared receiving module will produce signal output.Camera 5 is made up of a cmos image sensor MT9V034 with global shutter characteristic and camera lens, optical filter etc.; Imageing sensor MT9V034 works in the Slave pattern; Control through receiving processing circuit 6; Imageing sensor is only made public when receiving carrier signal, make the exposure synchronised of the luminous and camera of light pen like this.
In the present embodiment, exposure cycle is 20 milliseconds, and the led pulse width is 5 milliseconds; Luminous intensity in the pulse is 2 times of existing light pen intensity; Then the average current drain of light pen is about 1/2 of existing light pen, and the signal to noise ratio (S/N ratio) of system has improved 1 times, promptly reduces in 50% at the light pen power consumption; The signal to noise ratio (S/N ratio) of system has improved 100%, thereby has improved the work of system effectively.
In the foregoing description, utilized Pen point with luminous device 1 to carry out infrared carrier transmit, its Pen point with luminous device also is a synchronous signal transmitter simultaneously, and this has simplified hardware, and is effectively practical.If but Pen point with luminous is non-infrared light, then need independently infrared transmitting tube as synchronous signal transmitter.The emission that also can adopt radiofrequency emitting module and Receiver Module to carry out synchronizing signal receives.
In second embodiment of the present invention; Synchronizing signal is to be sent by the synchronous signal transmitter in the signal receiving device 7; And corresponding synchronous signal receiver 4 is arranged in light pen, can realize equally light pen luminous with the camera exposure synchronously, thereby reach the object of the invention.The advantage of this scheme is, because synchronizing signal can be by many pens receptions, so the rational rules design of process can realize the collaborative work of many pens.Like Fig. 3 and shown in Figure 4.
Though the present invention with preferred embodiment openly as above; But specific embodiment and accompanying drawing are not to be used for limiting the present invention, anyly are familiar with this art, in spirit that does not break away from the present invention and scope; Can do various variations or retouching from working as, but equally within protection scope of the present invention.Therefore protection scope of the present invention should with the application claim was defined is as the criterion.
Claims (7)
1. synchronous light pen electric whiteboard system; Comprise signal receiving device and light pen; Signal receiving device mainly is made up of receiving processing circuit and the camera that is attached thereto, and light pen mainly is made up of Pen point with luminous device and light pen circuit, it is characterized in that; In said signal receiving device, there is a synchronous signal receiver to be connected to said receiving processing circuit; And the imageing sensor in the described camera be one can overall situation exposure imageing sensor, a corresponding synchronous signal projector is arranged in said light pen, light pen is luminous with impulse form.
2. synchronous light pen electric whiteboard system according to claim 1 is characterized in that, described synchronous signal transmitter is an infrared transmitting tube, and described synchronous signal receiver is an infrared receiving module.
3. synchronous light pen electric whiteboard system according to claim 1 is characterized in that, described synchronous signal transmitter is a radiofrequency emitting module, and described synchronous signal receiver is a Receiver Module.
4. synchronous light pen electric whiteboard system according to claim 2 is characterized in that described synchronous signal transmitter part and Pen point with luminous device are same infrared transmitting tubes.
5. synchronous light pen electric whiteboard system; Comprise signal receiving device and light pen; Signal receiving device mainly is made up of receiving processing circuit and the camera that is attached thereto, and light pen mainly is made up of Pen point with luminous device and light pen circuit, it is characterized in that; Imageing sensor in the described camera be one can overall situation exposure imageing sensor; In said signal receiving device, have a synchronous signal transmitter to be connected to said receiving processing circuit, and a corresponding synchronous signal receiver is arranged in said light pen, light pen is luminous with impulse form.
6. synchronous light pen electric whiteboard system according to claim 5 is characterized in that, described synchronous signal transmitter is an infrared transmitting tube, and described synchronous signal receiver is an infrared receiving module.
7. synchronous light pen electric whiteboard system according to claim 5 is characterized in that, described synchronous signal transmitter is a radiofrequency emitting module, and described synchronous signal receiver is a Receiver Module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200970211U CN202166975U (en) | 2011-04-06 | 2011-04-06 | Synchronous light pen electronic whiteboard system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200970211U CN202166975U (en) | 2011-04-06 | 2011-04-06 | Synchronous light pen electronic whiteboard system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202166975U true CN202166975U (en) | 2012-03-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200970211U Expired - Fee Related CN202166975U (en) | 2011-04-06 | 2011-04-06 | Synchronous light pen electronic whiteboard system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202166975U (en) |
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2011
- 2011-04-06 CN CN2011200970211U patent/CN202166975U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120314 Termination date: 20160406 |
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| CF01 | Termination of patent right due to non-payment of annual fee |