CN102495698A - Intelligent electronic whiteboard system and light spot position extraction method based on intelligent electronic whiteboard system - Google Patents
Intelligent electronic whiteboard system and light spot position extraction method based on intelligent electronic whiteboard system Download PDFInfo
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- CN102495698A CN102495698A CN2011104147016A CN201110414701A CN102495698A CN 102495698 A CN102495698 A CN 102495698A CN 2011104147016 A CN2011104147016 A CN 2011104147016A CN 201110414701 A CN201110414701 A CN 201110414701A CN 102495698 A CN102495698 A CN 102495698A
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Abstract
The invention discloses an intelligent electronic whiteboard system. The intelligent electronic whiteboard system comprises an infrared laser writing pen, a projection curtain, a cold light projector, an infrared camera with an infrared filter, a video signal acquisition system and a personal computer (PC), wherein the infrared laser writing pen and the cold light projector are respectively positioned on the same side of the projection curtain; the infrared camera is positioned on the other side of the projection curtain; the infrared camera is connected with an input end of the PC through the video signal acquisition system; and an output end of the PC is connected with the cold light projector. The invention also discloses a light spot position extraction method based on the intelligent electronic whiteboard system. The invention has the advantages of low cost, high handwriting positioning accuracy, low handwriting positioning delay and good writing effect.
Description
Technical field
The present invention relates to a kind of intelligent electronic whiteboard system, relate in particular to a kind of intelligent electronic whiteboard system and facula position method for distilling thereof based on the infrared laser technology.
Background technology
Multimedia teaching has obtained popularizing in universities and colleges even middle and primary schools, and this teaching means makes that course content is abundant more vividly to be easy to the student and to absorb, improved greatly classroom efficiency.Traditional multimedia teaching facility all is main body with the PC, and the teacher need use the mouse device when on the classroom, PC being operated, and is unfavorable for that class offerings expresses.Existing blank has the price height, and the person's handwriting bearing accuracy is low, and the notes location postpones high shortcoming.
Summary of the invention
Technical matters to be solved by this invention is the defective to background technology, provides a kind of cheap, has higher person's handwriting bearing accuracy, and the person's handwriting location postpones little, the infrared laser formula electric whiteboard system that writing effect is good.
The present invention adopts following technical scheme for solving the problems of the technologies described above:
A kind of intelligent electronic whiteboard system comprises infrared laser lettering pen, projection screen, cold light projector, the infrared camera that has infrared filter, video signal collective system, PC; Wherein, Said infrared laser lettering pen, cold light projector lay respectively at the same side of projection screen; Said infrared camera is positioned at the opposite side of projection screen; Infrared camera links to each other with the input end of PC through said video signal collective system, and the output terminal of said PC links to each other with the cold light projector.
As the further prioritization scheme of intelligent electronic whiteboard system of the present invention, said video signal collective system comprises video separation module, analog comparator, facula position extraction module, D/A module, wireless receiving module and USB interface control module; Wherein, The output terminal of said infrared camera links to each other with the first input end of video separation module, analog comparator respectively; The output terminal of video separation module, analog comparator links to each other with the input end of facula position extraction module respectively; The output terminal of facula position extraction module links to each other with the input end of USB interface control module, the input end of D/A module respectively; The output terminal of USB interface control module links to each other with the input end of PC, and the output terminal of D/A module links to each other with second input end of analog comparator, and said wireless receiving module links to each other with the facula position extraction module.
Further prioritization scheme as intelligent electronic whiteboard system of the present invention; The written configures low power infrared laser pipe of said infrared laser lettering pen; Be packaged with wireless module in the body; Pen comprises one on one's body from resetting button and button, the roller module of simulating general mouse right and left key and roller function respectively.
As the further prioritization scheme of intelligent electronic whiteboard system of the present invention, said infrared camera is a PLA standard infrared camera, and said infrared filter adopts 760nm infrared light filter.
As the further prioritization scheme of intelligent electronic whiteboard system of the present invention, said infrared camera front end also disposes a fish-eye lens.
As the further prioritization scheme of intelligent electronic whiteboard system of the present invention, the wireless module of encapsulation adopts NRF24L01 type wireless module in the said infrared laser pen body.
Further prioritization scheme as intelligent electronic whiteboard system of the present invention; Said video separation module adopts LM1881 vision signal separating chips; Said analog comparator adopts the high differential comparator of TL714C; Said facula position extraction module adopts the ATmega16 single-chip microcomputer as being microcontroller, and said USB interface control module adopts the CH372 interface chip.
As the further prioritization scheme of intelligent electronic whiteboard system of the present invention, said projection screen adopts the PVC material.
A kind of facula position method for distilling based on intelligent electronic whiteboard system comprises the steps:
Step (1); Adopt the infrared laser lettering pen to projection screen one side projection infrared laser beam; Adopt the cold light projector to the projection of projection screen the same side, adopt infrared camera to take the infrared light spot on the projection screen, obtain the vision signal of infrared light spot from the opposite side of projection screen;
Step (2), the vision signal that adopts the video separation module that step (1) is obtained is separated, and draws row, the field signal of video flowing; Meanwhile, adopt analog comparator that vision signal is carried out the amplitude discrimination shaping, when infrared light spot appearred in the popular signal of video, adopting analog comparator was rectangular pulse signal with the analog-signal transitions of this corresponding row;
Step (3); Row, the field signal of the isolated video flowing of step (2) inputed to two interrupt pin of SCM Based facula position extraction module respectively, and the rectangular pulse signal that simultaneously step (2) is obtained inputs to the timer input capture pin of facula position extraction module;
Step (4) adopts the facula position extraction module to carry out the facula position information extraction, when the field signal of video flowing arrives the interruption of interrupt pin generation field, handles as follows respectively according to the parity field signal:
Step (41) if strange field signal allows row to interrupt, is removed row interruption times counter, waits for the arrival of row signal;
When the row signal arrives the interruption of interrupt pin generation row; The interruption times counter of will going adds one; And opening timing counter immediately, rectangular pulse signal to be caught, current line has hot spot to occur; Then capture rectangular pulse signal, and read the last hopping edge after the amplitude discrimination shaping T1, hopping edge two of T2 value constantly constantly down constantly;
Read after the amplitude discrimination shaping on hopping edge T1, hopping edge two of T2 constantly after the value constantly down constantly; Calculate the skew of rectangular pulse signal on the whole time period; Squint with the time and to estimate that hot spot squints with respect to image boundary; Be defined as the lateral coordinates component (X) of facula position at the projected picture two dimensional surface; After certain delegation captures rectangular pulse signal,, be defined as the along slope coordinate component (Y) of facula position at the projected picture two dimensional surface according to the skew of the worth glossing up of row interruption times counter with respect to the image up-and-down boundary;
Step (42); If even field signal; Then close row and interrupt, abandon each follow-up line data, then carry out the processing that last strange place collects data; Lateral coordinates component (X) and along slope coordinate component (Y) according to last strange gained are handled: comprise that the mode that adopts smothing filtering carries out filtering to noise information; And adopt the mode of tabling look-up that the information of being extracted is carried out distortion compensation, and obtain lateral coordinates, the along slope coordinate of hot spot at last at projected picture, obtain facula position information.
Further prioritization scheme as aforementioned hot spot position extracting method; Also comprise step when analog comparator carries out the amplitude discrimination shaping in step (2): adopt the D/A module that the digital signal of facula position extraction module output is changed into aanalogvoltage; Transfer to analog comparator, dynamically arrange the analog comparator voltage threshold.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
(1) lettering pen adopts the infrared laser pipe as light emitting source, strengthens antijamming capability, and a body designs a plurality of buttons, realizes more operating function.The infrared laser pipe that the present invention adopted is a low-power infrared laser pipe, and the laser beam that produces does not have injury to human eye, the spot size that laser beam forms on curtain can light source to the variable in distance of curtain, be convenient to person's handwriting and accurately locate.In addition, body design button and rotating disk can be simulated the function of the right and left key and the roller of conventional mouse, when product uses for the first time or deviation occurs, can utilize the relevant more accurate process of button operation.The design of body is from resetting knob, and the power supply of control laser tube is touched during use and lighted laser tube, when not busy from going out, but conserve energy improves life of product.
(2) infrared camera is placed in the curtain rear side, and writer's arm or health can not disturb the monitoring of camera to hot spot on the curtain, and so the posture of nature is carried out written operations.In the classroom, curtain should be as far as possible near the dais, if the position of projector being installed according to prior art, then its curtain area can receive projected light degree system.The present invention adopts projector traditional in the classroom to lay mode, can obtain bigger projected area.Because curtain is laid near the dais, camera is to the curtain close together.In order to collect whole curtain, to increase the camera visual angle, a plurality of cameras perhaps arranged side by side are to obtain bigger monitoring area at the configurable fish-eye lens of the front end of camera.
(3) the present invention adopts low-cost 8 single-chip microcomputers as processor and the high-efficiency reliable facula position extraction algorithm that combines the present invention to provide, reduces system cost greatly, improves practicality of the present invention.Simultaneously, the present invention adopts CH372 USB interface chip, has improved the degree of freedom of data upload, is convenient to expansion and hot-swappable.Among the present invention, the information that extraction infrared light spot positional information that slave computer ATmega16 is real-time and reception wireless receiving module are uploaded, and control CH372 uploads to related data the application software of upper PC through the USB mouth with the mode of uploading in batches through port.
Description of drawings
Fig. 1 is the synoptic diagram of intelligent electronic whiteboard system of the present invention.
Fig. 2 is the elementary diagram of the analog comparator in the intelligent electronic whiteboard system.
Fig. 3 is the signal wiring schematic diagram of the facula position extraction module in the intelligent electronic whiteboard system.
Fig. 4 is the structural representation of infrared lettering pen of the present invention.
Label declaration among the figure: 1-infrared laser pen, 2-projection screen, 3-cold light projector, 4-infrared camera, the infrared filter of 5-; The 6-fish-eye lens, 7-video signal collective system, 8-infrared laser on & off switch, 9-rotating disk; The 10-left button, 11-right button, 12-infrared laser emitting head, 13-wireless module.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is done further detailed description:
As shown in Figure 1, the intelligent electronic whiteboard system that the present invention designed comprises infrared laser lettering pen, projection screen, cold light projector, the infrared camera that has infrared filter, PC; Wherein, Infrared laser lettering pen, cold light projector lay respectively at the same side of projection screen; Infrared camera is positioned at the opposite side of projection screen; Also comprise the video signal collective system, infrared camera links to each other with the input end of PC through said video signal collective system, and the PC output terminal links to each other with the cold light projector.
In specific embodiment, camera and projector are placed in the both sides of curtain respectively, and the about 1m of distance of curtain and camera is that the monitoring range of single camera can reach more than two square metres under the situation of 120 degree at camera vision subtended angle.
Shown in figure 1; The video signal collective circuit comprises video separation module, analog comparator, facula position extraction module, D/A module, wireless receiving module and USB interface control module; The output terminal of infrared camera links to each other with the input end of video separation module and analog comparator respectively; The output terminal of video separation module and analog comparator links to each other with the input end of facula position extraction module; The output terminal of facula position extraction module links to each other with the input end of USB interface control module, the output terminal of USB interface control module and the input end of PC, and the output terminal of facula position extraction module links to each other with the input end of D/A module; The output terminal of D/A module links to each other with the input end of analog comparator, and the output terminal of wireless receiving module links to each other with the input end of facula position extraction module.
The facula position extraction module adopts low-cost 8 single-chip microcomputers as processor, reduces system cost greatly, improves practicality of the present invention.Simultaneously, the present invention adopts CH372 USB interface chip, has improved the degree of freedom of data upload, is convenient to expansion and hot-swappable.Among the present invention, the information that extraction infrared light spot positional information that ATmega16 is real-time and wireless receiving module are uploaded, and control CH372 control chip uploads to related data the application software of upper PC through USB port with the mode of uploading in batches through port.
Infrared laser lettering pen configures low power infrared laser pipe; Said infrared laser lettering pen pen has one on one's body from resetting button; In the infrared laser lettering pen, be packaged with wireless module; Be used to transmit the infrared laser lettering pen pen operation information of two other button and rotating disk on one's body, said two other button and rotating disk are the functions that is used for simulating respectively the right and left key and the roller of general mouse.
Wireless module is used to send wireless data; A body button of laser inscription pen and the operation information of roller are sent to the wireless receiving module in the video signal collective system through the wireless module that is built in the laser inscription pen; After wireless receiving module obtains these wireless datas, pass to the facula position extraction module and handle;
Video separation module among the present invention adopts LM1881 vision signal separating chips; Analog comparator adopts the high differential comparator of TL714C; The facula position extraction module adopts the ATmega16 single-chip microcomputer as being microcontroller, and the USB interface control module adopts the CH372 interface chip.
As shown in Figure 2, the elementary diagram of analog comparator advances shaping to mixed video signal and handles, and wherein threshold voltage is provided by the D/A module of ATmega16, realizes self-adaptation.
As shown in Figure 3, provided the signal wiring schematic diagram of the facula position extraction module in the intelligent electronic whiteboard system.Being transported to three signals that have of facula position extraction module, is respectively the rectangular pulse signal after video line signal, video field signal, the shaping; Wherein the row of video flowing, field signal input to respectively based on two interrupt pin in the single-chip microcomputer, the timer input capture pin of the single-chip microcomputer of rectangular pulse signal input simultaneously.
As shown in Figure 4, lettering pen adopts bar-shaped pen type design, and there are three knobs at a skill place of holding; One at upside near thumb position; Being used for the laser tube power supply that break-make is placed in forward end in the infrared laser lettering pen, is from resetting knob, laser tube outage when thumb unclamps.Two knobs of downside are respectively by the control of forefinger and middle finger, are used for analog mouse right and left key function, and its key information is sent on the video information collecting circuit board through the wireless module that is contained in rear end in the body.A body also is designed with rotating disk in addition, is used for the roller of analog mouse, and its rotation information also is can cross wireless module to be sent on the collecting circuit board.The infrared laser lettering pen is by No. 7 powered battery.Laser tube sends 808nm laser, and power is 50mw; Wireless module adopts NRF24L01.
Infrared camera is a PLA standard infrared camera, increases the camera visual angle at fish-eye lens of infrared camera front-end configuration, and a plurality of cameras perhaps arranged side by side are to obtain bigger monitoring area.
Infrared camera is placed in the projection screen rear side, and writer's arm or health can not disturb the monitoring of infrared camera to hot spot on the projection screen, and so the posture of nature is carried out written operations.In the classroom, projection screen should be as far as possible near the dais.The present invention adopts projector traditional in the classroom to lay mode, can obtain bigger projected area.Because projection screen is laid near the dais, infrared camera is to the projection screen close together.In order to collect whole curtain; At the configurable fish-eye lens of the front end of infrared camera to increase the infrared camera visual angle; Because the infrared laser lettering pen that is designed emission 808nm infrared laser is so select the infrared filter of 760nm typical wavelengths to filter the environment stray light.
In actual mechanical process; Be provided with application software at the PC end, this application software is developed under the VC6.0 environment, and it is the interface that PC provides that the mode in the DLL storehouse through dynamic link CH372 interface chip is called the CH372 interface chip; Through calling the api interface of Windows; Realize to the cursor of PC accurately move, right and left key operation, roller operation, these processes all belong to prior art, just do not give unnecessary details in detail in the present embodiment.
As a kind of optimal way of the present invention, said projection screen adopts the PVC material.Said PVC material projection screen can select soft hanging on the classroom and can curl to pack up, and perhaps selects being fixed in the framework of hard, props up to stand on the ground.
To the ATmega16 single-chip microcomputer, the highly effective type hot spot method for distilling that the present invention's design makes new advances reduces system cost, and the expansion peripheral function, increases the degree of freedom of exploitation.
The hot spot method for distilling of intelligent electronic whiteboard system of the present invention comprises the steps:
Step (1); Adopt the infrared laser lettering pen to projection screen one side projection infrared laser beam; Adopt the cold light projector to the projection of projection screen the same side, adopt infrared camera to take the infrared light spot on the projection screen, obtain the vision signal of infrared light spot from the opposite side of projection screen;
Step (2), the vision signal that adopts the video separation module that step (1) is obtained is separated, and must go on a journey, field signal; Meanwhile, adopt analog comparator that vision signal is carried out the amplitude discrimination shaping, when infrared light spot appearred in corresponding row, analog comparator was a rectangular pulse signal with the analog-signal transitions of this corresponding row;
Step (3) inputs to two interrupt pin of SCM Based facula position extraction module respectively with the isolated row of step (2), field signal, simultaneously said rectangular pulse signal is inputed to the timer input capture pin of facula position extraction module;
Step (4), the facula position extraction module carries out the facula position information extraction, when field signal arrives the interruption of interrupt pin generation field, handles as follows respectively according to parity field:
Step (41), if strange, then allow row to interrupt, remove row interruption times counter, wait for the arrival of row signal;
When the row signal arrives the interruption of interrupt pin generation row; The interruption times counter of will going adds one; And opening timing counter immediately, rectangular pulse signal to be caught, current line has hot spot to occur; Then capture rectangular pulse signal, and read the last hopping edge after the amplitude discrimination shaping T1, hopping edge two of T2 value constantly constantly down constantly;
Read after the amplitude discrimination shaping on hopping edge T1, hopping edge two of T2 constantly after the value constantly down constantly; Calculate the skew of rectangular pulse signal on the whole time period; Squint with the time and to estimate that hot spot squints with respect to image boundary; Be defined as facula position at the X of projected picture two dimensional surface coordinate components, after certain delegation captures rectangular pulse signal, according to the skew of the worth glossing up of row interruption times counter with respect to the image up-and-down boundary;, be defined as facula position at the Y of projected picture two dimensional surface coordinate components;
Step (42) is if the idol field is then closed row and interrupted; Abandon each follow-up line data, then carry out the processing that last strange place collects data, handle according to the X coordinate and the Y coordinate of last strange gained; Comprise that the mode that adopts smothing filtering carries out filtering to noise information; And adopt the mode of tabling look-up that the information of being extracted is carried out distortion compensation, thereby obtain hot spot exactly at the X of projected picture coordinate, Y coordinate; Obtain facula position information.
After obtaining X coordinate and Y coordinate, this information is uploaded to PC through CH372.The PC end carries out software development under the VC6.0 environment, realize uploading reading of data through the DLL storehouse of dynamic link CH372 chip.In addition, software is realized the mobile control to the PC cursor through the api interface that calls WINDOWS operating system, and the cursor of PC is moved on the position of being confirmed by aforementioned X coordinate and Y coordinate on the screen., since the projector connecting relation, the same moved further of the cursor on the projection screen.
Thereby when the sightless infrared laser spot of human eye on the projection screen moved, the cursor on the projection screen was accurately followed.
Also comprise step when analog comparator carries out the amplitude discrimination shaping in step (2): adopt the D/A module that the digital signal of facula position extraction module output is changed into aanalogvoltage, transfer to analog comparator, dynamically arrange the analog comparator voltage threshold.
Intelligent electronic whiteboard system that the present invention designed and facula position method for distilling thereof have advantage cheap, that the person's handwriting bearing accuracy high, the delay of person's handwriting location is little, writing effect is good.
Claims (10)
1. an intelligent electronic whiteboard system is characterized in that: comprise infrared laser lettering pen, projection screen, cold light projector, the infrared camera that has infrared filter, video signal collective system, PC; Wherein, Said infrared laser lettering pen, cold light projector lay respectively at the same side of projection screen; Said infrared camera is positioned at the opposite side of projection screen; Infrared camera links to each other with the input end of PC through said video signal collective system, and the output terminal of said PC links to each other with the cold light projector.
2. intelligent electronic whiteboard system according to claim 1 is characterized in that: said video signal collective system comprises video separation module, analog comparator, facula position extraction module, D/A module, wireless receiving module and USB interface control module; Wherein, The output terminal of said infrared camera links to each other with the first input end of video separation module, analog comparator respectively; The output terminal of video separation module, analog comparator links to each other with the input end of facula position extraction module respectively; The output terminal of facula position extraction module links to each other with the input end of USB interface control module, the input end of D/A module respectively; The output terminal of USB interface control module links to each other with the input end of PC, and the output terminal of D/A module links to each other with second input end of analog comparator, and said wireless receiving module links to each other with the facula position extraction module.
3. intelligent electronic whiteboard system according to claim 1; It is characterized in that: the written configures low power infrared laser pipe of said infrared laser lettering pen; Be packaged with wireless module in the body; Pen comprises one on one's body from resetting button and button, the roller module of simulating general mouse right and left key and roller function respectively.
4. intelligent electronic whiteboard system according to claim 1 is characterized in that: said infrared camera is a PLA standard infrared camera, and said infrared filter adopts 760nm infrared light filter.
5. intelligent electronic whiteboard system according to claim 1 is characterized in that: said infrared camera front end also disposes a fish-eye lens.
6. intelligent electronic whiteboard system according to claim 3 is characterized in that: the wireless module of encapsulation adopts NRF24L01 type wireless module in the said infrared laser pen body.
7. intelligent electronic whiteboard system according to claim 2; It is characterized in that: said video separation module adopts LM1881 vision signal separating chips; Said analog comparator adopts the high differential comparator of TL714C; Said facula position extraction module adopts the ATmega16 single-chip microcomputer as being microcontroller, and said USB interface control module adopts the CH372 interface chip.
8. intelligent electronic whiteboard system according to claim 1 is characterized in that: said projection screen adopts the PVC material.
9. the facula position method for distilling based on the said intelligent electronic whiteboard system of claim 1 is characterized in that, comprises the steps:
Step (1); Adopt the infrared laser lettering pen to projection screen one side projection infrared laser beam; Adopt the cold light projector to the projection of projection screen the same side, adopt infrared camera to take the infrared light spot on the projection screen, obtain the vision signal of infrared light spot from the opposite side of projection screen;
Step (2), the vision signal that adopts the video separation module that step (1) is obtained is separated, and draws row, the field signal of video flowing; Meanwhile, adopt analog comparator that vision signal is carried out the amplitude discrimination shaping, when infrared light spot appearred in the popular signal of video, adopting analog comparator was rectangular pulse signal with the analog-signal transitions of this corresponding row;
Step (3); Row, the field signal of the isolated video flowing of step (2) inputed to two interrupt pin of SCM Based facula position extraction module respectively, and the rectangular pulse signal that simultaneously step (2) is obtained inputs to the timer input capture pin of facula position extraction module;
Step (4) adopts the facula position extraction module to carry out the facula position information extraction, when the field signal of video flowing arrives the interruption of interrupt pin generation field, handles as follows respectively according to the parity field signal:
Step (41) if strange field signal allows row to interrupt, is removed row interruption times counter, waits for the arrival of row signal;
When the row signal arrives the interruption of interrupt pin generation row; The interruption times counter of will going adds one; And opening timing counter immediately, rectangular pulse signal to be caught, current line has hot spot to occur; Then capture rectangular pulse signal, and read the last hopping edge after the amplitude discrimination shaping T1, hopping edge two of T2 value constantly constantly down constantly;
Read after the amplitude discrimination shaping on hopping edge T1, hopping edge two of T2 constantly after the value constantly down constantly; Calculate the skew of rectangular pulse signal on the whole time period; Squint with the time and to estimate that hot spot squints with respect to image boundary; Be defined as the lateral coordinates component (X) of facula position at the projected picture two dimensional surface; After certain delegation captures rectangular pulse signal,, be defined as the along slope coordinate component (Y) of facula position at the projected picture two dimensional surface according to the skew of the worth glossing up of row interruption times counter with respect to the image up-and-down boundary;
Step (42); If even field signal; Then close row and interrupt, abandon each follow-up line data, then carry out the processing that last strange place collects data; Lateral coordinates component (X) and along slope coordinate component (Y) according to last strange gained are handled: comprise that the mode that adopts smothing filtering carries out filtering to noise information; And adopt the mode of tabling look-up that the information of being extracted is carried out distortion compensation, and obtain lateral coordinates, the along slope coordinate of hot spot at last at projected picture, obtain facula position information.
10. the facula position method for distilling based on intelligent electronic whiteboard system according to claim 9; It is characterized in that: also comprise step when analog comparator carries out the amplitude discrimination shaping in step (2): adopt the D/A module that the digital signal of facula position extraction module output is changed into aanalogvoltage; Transfer to analog comparator, dynamically arrange the analog comparator voltage threshold.
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| CN113552972A (en) * | 2021-06-08 | 2021-10-26 | 中教云智数字科技有限公司 | Electronic whiteboard based on infrared camera and using method thereof |
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Application publication date: 20120613 |