CN104965625B - A kind of Visual Teaching display systems - Google Patents
A kind of Visual Teaching display systems Download PDFInfo
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- CN104965625B CN104965625B CN201510289264.8A CN201510289264A CN104965625B CN 104965625 B CN104965625 B CN 104965625B CN 201510289264 A CN201510289264 A CN 201510289264A CN 104965625 B CN104965625 B CN 104965625B
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Abstract
The invention discloses a kind of Visual Teaching display systems, including projecting apparatus, projection screen, computer, and teaching pen, camera, ultrasonic receiver, computing chip, the computer receives described dot pattern picture or teaching pen location coordinate information, and dot pattern picture is handled, obtain luminous point coordinate information；Built-in picture function is called according to luminous point coordinate information or teaching pen location coordinate information, generates corresponding luminous point image coordinate or teaching pen position coordinates image, and luminous point image coordinate or teaching pen position coordinates image are exported to the projecting apparatus.The present invention realizes the fusion of the multimedia educational model and traditional writing on the blackboard teaching pattern, and teacher can follow one's bent to be switched on demand, effectively improves classroom efficiency.The present invention is energized by the way of solar recharging to core component teaching pen, realizes green long-time continuation of the journey.The cost of investment of the present invention is not high, is adapted to all kinds of educational institutions in the whole nation, has extraordinary application prospect.
Description
Technical field
The invention belongs to information technology teaching field, is specifically related to a kind of Visual Teaching display systems.
Background technology
With the popularization and application of information technology, this new teaching pattern of area of computer aided Multimedia Classroom Teaching is being imparted knowledge to students
Boundary causes increasing concern.Teacher is lectured (hereinafter referred to as more matchmakers using the software development electronic courseware such as PPT, WPS
Body is imparted knowledge to students).It is deep to be liked by teacher because multimedia teaching is vivid, contain much information, display form is various.But in multimedia
In teaching practice application process, the drawbacks of it is compared with traditional traditional instruction is but exposed：As teacher stands on computer side for a long time, and
The exchange of student's expression in the eyes limbs is very few；Lecture content to fix in advance, it is difficult to which random adjustment is taught students in accordance with their aptitude；Excessive velocities of attending class student is difficult
With digestion, failing to grip with emphasis in face of numerous and diverse content causes results of learning bad, is especially largely derived in needs such as mathematics, physics
Basic subject in, the teaching efficiency of traditional writing on the blackboard makes multimedia teaching too far behind to catch up.Therefore, multimedia teaching and traditional writing on the blackboard
The reasonably combined of teaching is the effective way for realizing efficient classroom.But courseware content is not easy adjustment change during multimedia teaching,
Traditional traditional instruction easily causes teaching profession's disease-pharyngitis using chalk, and along with efficiency it is low the problem of.If but simultaneously
Using both modes of attending class it is necessary to ceaselessly switch between chalk and laser pen, this simply formally realizes both
Combination, it is the drawbacks of not overcoming both from root, ineffective.
It further investigation reveals that, in order to improve existing class efficacy, existing patent document is carried out to structure of classroom teaching aid etc.
Optimization design.Patent document CN 203386390U disclose a kind of multimedia teaching handwriting device, the hand-written dress of the multimedia teaching
Put including curtain, projector, VGA video lines, Computer for teachers, storage device, handwriting pad etc..Patent document CN 102737526A
Disclose a kind of multimedia education system being made up of writing module, active display module and figure modular converter.Patent document
CN 202306850U disclose a kind of electronic handwritten teaching apparatus, and it includes being sequentially connected erasable touch connect and writes screen, processor
And projecting apparatus, in addition to can write write on screen tactile in above-mentioned erasable touch and write pen and be available for above-mentioned projector and realize aobvious
The projection screen shown.The core of above three technology is all handwriting pad, is calculated by the way that the content transmission write on the jotting surface is given
Machine is write and changed on projection screen to realize.Handwriting pad must realize the connection between computer by USB, and this is just
Teacher is limited to dais scope, does not realize the remote modification to projection screen content.
Electronic powder pen technology is commonly used in improvement classroom environment, reduces classroom dust pollution, the key technology of this kind of technology
With efficiently, be accurately positioned.Patent document CN 202167015U disclose a kind of net work teaching system interactive teaching and learning ultrasonic wave hand
Input unit is write, realizes the improvement to traditional writing on the blackboard teaching pattern, avoids classroom dust pollution, but the technology does not have
The effective advantage for utilizing multimedia teaching, the function of the traditional writing on the blackboard of the fusion and multimedia teaching of the present invention is not realized.
Technical elements, the technology utilizes two ultrasonic waves being arranged in plate face to be write to receive head, using plane two point form ultrasonic wave
Positioning obtains the positional information of electronics chalk, and this distance-finding method is simple in construction, but simultaneously also big along with interference, and precision is low
Deficiency.In addition, electronic teaching screen is also a kind of optimization design to classroom teaching aid.Patent document CN201845445U discloses one
Kind electronic blackboard, and in particular to a kind of culture and education apparatus, it includes large screen display, main frame, keyboard and mouse,
The large screen display is suspended on the front in classroom, the display of the signal input part and main frame of large screen display
Signal output part is connected, and the signal output part of keyboard is connected with the keyboard signal input of main frame, and the signal of mouse is defeated
Go out end with the mouse signal input of main frame to be connected.It can be write on electronic blackboard with touch-control, the technology realizes more matchmakers
Body is imparted knowledge to students and the fusion of traditional traditional instruction.The technology realizes and write that cost of implementation is higher using electronic touch technology.
The content of the invention
The invention provides a kind of Visual Teaching display systems, the excellent of multimedia teaching and traditional traditional instruction is merged
Point, classroom teaching efficiency is improved, while eliminate classroom dust pollution.
A kind of Visual Teaching display systems, including projecting apparatus, the projection screen for receiving projector image signal, be used for
To the computer of projection screen input image information, in addition to：
Teaching pen, with Laser emission end and ultrasonic wave transmitting terminal, it is respectively used to launch laser signal and ultrasonic signal；
Camera, the light spot signal that acquired projections screen comes up from laser transmitting terminal, and the light spot signal of collection is converted into
Dot pattern picture；
At least three ultrasonic receivers, the ultrasonic signal is received, obtain at least three different reception time letters
Number；
Computing chip, teaching pen location coordinate information is calculated according to the time signal of reception；
The computer receives described dot pattern picture or teaching pen location coordinate information, and to dot pattern picture at
Reason, obtains luminous point coordinate information；Built-in picture function is called according to luminous point coordinate information or teaching pen location coordinate information, it is raw
Into corresponding luminous point image coordinate or teaching pen position coordinates image, and by luminous point image coordinate or teaching pen position coordinates image
Export to the projecting apparatus.
Preferably, the ultrasonic receiver is three, three ultrasonic receivers are equidistantly linearly installed.Described three
Individual ultrasonic receiver is installed in a plate face to be write, and the plate face to be write is arranged in classroom.Plate face to be write
To be projection screen or common blackboard.To obtain teaching pen position coordinates, the computing chip passes through built-in non-same
Step formula geometry resolves location algorithm and teaching pen location coordinate information is calculated.Location algorithm is resolved using asynchronous type geometry,
Setting accuracy is improved, more has the sense of reality during guarantee is hand-written.In the present invention, the computing chip is that ATMega128 is mono-
Piece movement piece.ATMega128 singlechip chips resolve range measurement principle using asynchronous geometry and obtain teaching pen position coordinates.
In the present invention, the computing chip is transmitted teaching pen location coordinate information to computer by communication module；Institute
It is APC220 serial communication modules to state communication module；The computing chip is ATMega128 singlechip chips；APC220 serial ports leads to
News module realizes the communication between the ATMega128 singlechip chips and the computer in the form of WiFi.
To realize that the long-time of the teaching pen is continued a journey, preferably, teaching pen institute's consuming electric power is by the built-in sun
Can cell panel and the supply of pressure limiting charging circuit.Using power of the rechargeable battery as teaching pen, limited using solar panels and charging
Volt circuit to rechargeable battery charging reaches for a long time continue a journey, it is described charging pressure limiting circuit have prevent battery overshoot and recoil with up to
To the effect of protection battery.
For ease of the installation and data acquisition of camera, preferably, the picture signal of camera shooting passes through nothing
Line WiFi form is delivered to computer.To eliminate interference of the indoor light source to laser spot, preferably, use wavelength for
720nm filter filter removing and made an uproar to wireless camera.The luminous point that the present invention is extracted by wireless camera on projection screen is believed
Breath realizes remote change to project content, and compared with prior art, function of the invention and principle all exist significantly different.
For uniform emission ultrasonic signal, preferably, the teaching pen ultrasonic wave transmitting terminal bottom is 45 ° of conical surface knot
Structure, ultrasonic signal is uniformly diffused to by all directions by the cone structure.
To obtain light spot position coordinate, preferably, using at threshold value when the computer is handled dot pattern picture
Reason principle and template matches principle simultaneously use algorithm.
As further preferred, the threshold process principle and template matches principle are simultaneously comprised the following steps with algorithm：
(1) samples pictures of the collection in advance with corresponding laser spot, and preserved as template picture；
(2) according to the color rgb value and HSV value of setting, binary conversion treatment is done to the dot pattern picture of camera input, specifically
Step is：
(2-1) reads the dot pattern picture of camera input；
(3-2) judges whether recorded luminous point coordinate information；
If it is present in dot pattern picture, the pixel on the luminous point coordinate periphery recorded positioned at this, and according to setting
Color rgb value and HSV value, binary conversion treatment is carried out to the image of scanning；
If it does not exist, then all pixels point in dot pattern picture one by one, and according to the color rgb value and HSV value of setting,
Binary conversion treatment is carried out to the image of scanning；
(3) image of binary conversion treatment is handled using template matching algorithm and template picture, obtains luminous point coordinate
Information, concretely comprise the following steps：
(3-1) according between pixel apart from size, the carry out region division to the image after binary conversion treatment；Such as when
When the distance between two pixels meet to require, then it is assumed that two pixels belong to a region, judge one by one successively be
Can；
(3-2) removes noise spot according to area size；
(3-3) is moved point by point with preprepared template picture in the image after above-mentioned zone divides, and uses opencv
The function of offer quantifies difference, finds difference Minimum Area, judges whether qualified region：
In each region, satisfactory pixel number in image after statistics binaryzation, if it exceeds certain value, just
It is laser spots position to assert the region, then defines the area as current luminous point coordinate points；
If there is no satisfactory region, recorded luminous point coordinate information is removed, updates the luminous point recorded
Coordinate information, return to step (2).
Threshold process principle and template matches principle are used in combination by the present invention, and it is accurate to further increase laser spot positions positioning
Exactness.Template matching algorithm is to move preprepared template picture point by point in the image that camera captures, and is used
The function that opencv is provided quantifies difference, finds difference Minimum Area.Then in the region, after statistics binaryzation in image
Satisfactory pixel number, if it exceeds certain value, it is assumed that the region is laser spots position.
When computer receives a luminous point coordinate information or teaching pen location coordinate information, it is first determined whether in the presence of
The luminous point coordinate information or teaching pen location coordinate information recorded, if so, then call built-in picture function, draw this two
Lines and more new record between point；If it is not, current luminous point coordinate information or teaching pen location coordinate information are remembered
Record, more new record；If in setting time interval, there is not new luminous point coordinate information or teaching pen position coordinates letter
Breath, then delete current spot coordinate information or teaching pen location coordinate information.
Functionally said from realizing, new classroom display systems of the invention, including aerial write subsystem and electronics chalk
Subsystem：
In the aerial subsystem that writes, the Laser emission end of teaching pen can transmitting red laser beam signal, the red laser signal
Laser spot is formed on projection screen.The luminous point launched to projection screen at Laser emission end can be photographed by wireless camera, turned
Turn to dot pattern picture；Built-in computer has luminous point recognizer, and luminous point recognizer processing wireless camera is captured to obtain light
Dot image and the coordinate for obtaining corresponding red laser luminous point；Then the picture function that Windows is carried is called corresponding by computer
Position draws luminescent spot track.
In electronics chalk subsystem, ultrasonic wave transmitter module, ultrasonic wave hair are provided with inside the ultrasonic wave transmitting terminal of teaching pen
Penetrate module transmitting ultrasonic signal, three ultrasonic receivers receive described transmitting ultrasonic signal, and output three is different
Time signal；Computing chip processing three sonication times signals, the position for calculating the teaching pen of transmitting ultrasonic wave are sat
Mark；Then the picture function that Windows is carried is called in the track of correspondence position teaching pen by computer.The ultrasonic wave launches mould
Block is made up of ultrasonic oscillator, ultrasonic drive circuit, oscillation generating circuit, contact switch etc..
The present invention is several using asynchronous type using equidistant three ultrasonic receivers being linearly installed in plate face to be write
What settlement method realizes the positioning to electronics chalk, and compared with prior art, realization principle of the invention is significantly different.
It is of the invention to have merged two kinds of teaching patterns of multimedia and traditional writing on the blackboard compared with traditional classroom display systems, tool
Body has following advantage：
1st, the aerial subsystem that writes in the present invention realizes remotely modifies to display screen content, and teacher can be
The optional position in classroom carries out circle note modification to courseware content, and teacher is freed from dais, strengthens Class
Interaction, enhancing classroom instruction experience.
2nd, the electronics chalk subsystem in the present invention replaces the chalk in traditional traditional instruction, and it is dirty to eliminate classroom dust
Dye, has ensured the health of teacher and student.Meanwhile multimedia teaching and the fusion of traditional traditional instruction advantage are realized,
Teacher can make classroom various informative according to free switching both of which is actually needed, and improve classroom and give lessons efficiency.
3rd, the teaching pen in the present invention realizes that green long-time is continued a journey using solar powered technology, only need to be just
Being placed under normal indoor lighting conditions can charge to teaching pen, and while saving the energy, having evaded conventional laser pen makes
The bad Consumer's Experience of the frequent charge often occurred during.
In summary, the present invention realizes the fusion of the multimedia educational model and traditional writing on the blackboard teaching pattern, teacher
It can follow one's bent and switch on demand, effectively improve classroom efficiency.The present invention is taught core component by the way of solar recharging
Written confession energy is learned, realizes green long-time continuation of the journey.The cost of investment of the present invention is not high, is adapted to all kinds of teaching machines in the whole nation
Structure, there is extraordinary application prospect.
Brief description of the drawings
Fig. 1 is the composition schematic diagram of the Visual Teaching display systems of the present invention；
Fig. 2 is the luminous point recognizer algorithm flow chart that the present invention uses；
Fig. 3 is that the asynchronous geometry that the present invention uses resolves range measurement principle figure.
In above-mentioned accompanying drawing：
1st, teaching pen, 2, projection screen, 3, filter, 4, wireless camera, 5, computer, 6, projecting apparatus, 7, connect for ultrasonic wave
Receive device, 8, ATMega128 singlechip chips, 9, APC220 serial communication modules；
1a, teaching pen Laser emission end, 1b, the ultrasonic wave transmitting terminal of teaching pen.
Embodiment
As shown in Figure 1, the present invention proposes a kind of Visual Teaching display systems, there is aerial write subsystem and electronics
Chalk subsystem forms.
Subsystem is write by teaching pen 1, projection screen 2, filter 3, wireless camera 4, computer 5,6 groups of projecting apparatus in the air
Into；
Electronics chalk subsystem is by teaching pen 1, ultrasonic receiver 7, ATMega128 singlechip chips 8, APC220 serial ports
Communication module 9, computer 5, projecting apparatus 6 form.
A kind of operation principle of Visual Teaching display systems proposed by the present invention is：
A, write subsystem in the air：The Laser emission end 1a transmitting red laser beams of teaching pen 1 are to projection screen 2, in projection screen 2
The upper light spot signal for forming laser, the light spot signal of projection screen 2 enter the camera lens of wireless camera 4 after filter 3 filters noise reduction,
Dot pattern picture is generated by wireless camera 4, wireless camera 4 is provided with wifi transmitting terminals, and the dot pattern picture of generation passes through wireless
The wifi signals of the wifi transmitting terminals transmitting of camera 4 are transferred to computer 5, and the luminous point recognizer in computer 5 is to receiving
The dot pattern picture processing arrived, obtains luminous point coordinate information, recalls the picture function (window API) built in computer 5 right
Coordinate position is answered to generate photoelectric image signal, the photoelectric image signal of generation is projected by the projecting apparatus 6 being connected with computer 5
On shadow screen 2, aerial writing function is completed.
As shown in Fig. 2 above-mentioned luminous point recognizer and the concrete processing procedure of the photoelectric image signal of computer generation
For：
(1) samples pictures of the collection in advance with corresponding laser spot, and preserved as template picture；
(2) computer obtains the dot pattern picture of camera collection, according to specific color rgb value and HSV value, to camera
The dot pattern picture of input does binary conversion treatment, concretely comprises the following steps：
(2-1) computer obtains the dot pattern picture of camera collection；
(2-2) is directed to current spot image, judges whether the luminous point coordinate information recorded：
If there is the luminous point coordinate information recorded, then scan in current spot image and sat positioned at the luminous point recorded
The pixel on periphery is marked, and according to specific color rgb value and HSV value, binary conversion treatment is done to the image after scanning；
If it does not exist, then all pixels point in current spot image is scanned one by one, and according to specific color rgb value
And HSV value, binary conversion treatment is done to the image after scanning；
(3) image of binary conversion treatment is handled using template matching algorithm and template picture, obtains luminous point coordinate
Information, i.e.,：
(3-1) according between pixel apart from size, the carry out region division to the image after threshold process；When two it is adjacent
The distance of pixel meets requirement, then judges that two pixels belong to a region；
(3-2) removes noise spot according to area size；
(3-3) is moved point by point with image of the preprepared template picture after region division, is provided with opencv
Function difference is quantified, find difference Minimum Area, judge whether qualified region：
If in the region, satisfactory pixel number in image after statistics binaryzation, if it exceeds certain value,
It is assumed that the region is present laser point position, then current spot coordinate is defined the area as；
If there is no satisfactory region, recorded luminous point coordinate information is removed, updates the luminous point recorded
Coordinate information, return to step (2)；
(4) after computer obtains current spot coordinate information, according to whether making in the presence of recorded luminous point coordinate information
It is following to judge：
If there is the luminous point coordinate information recorded, then the built-in picture function of computer calling, is being painted on screen
The luminous point coordinate recorded is made to the coordinate line segment of current spot coordinate points, recording spot coordinate information is then updated, returns
Step (2)；If there is no the luminous point coordinate information recorded, then current spot coordinate information is recorded, then update and remembered
The luminous point coordinate information of record, return to step (2).
B, electronics chalk subsystem：Teaching pen 1 with wait write plate face contact when, teaching pen 1 ultrasonic wave transmitting terminal 1b hair
Penetrate ultrasonic signal, the ultrasonic signal by installed in after writing plate face on three ultrasonic receivers 7 receive after, by three
Different time signals is transferred to ATMega128 singlechip chips 8, by the asynchronous type set in ATMega128 singlechip chips 8
The location coordinate information of teaching pen 1 is obtained after resolving location algorithm processing, the location coordinate information passes through APC220 serial communications
Module 8 launches transmission of wireless signals to computer 5, calls the drawing software built in computer 5 to be generated in respective coordinates position and schemes
As signal, the picture signal of generation is projected in plate face to be write by the projecting apparatus 6 being connected with computer 5, completes electronics chalk
Function.
When the respective coordinates position of computer 5 generates picture signal, using similar method：
(1) teaching pen location coordinate information is received；
(2) it is first determined whether in the presence of the teaching pen location coordinate information recorded, if it does not exist, then return to step
(1)；If there is the picture function of the teaching pen location coordinate information recorded, then calling built-in computer, on screen
The teaching pen location coordinate information recorded is drawn to the coordinate line segment of new teaching pen location coordinate information, then updates teaching pen
Location coordinate information, return to step (1)；
(3) when computer is in setting time, teaching pen location coordinate information is not received, then removes the teaching recorded
Location coordinate information, update teaching pen location coordinate information, return to step (1)；
Teaching pen head 1a in the present invention is laser beam emitting head, can transmitting red laser beam；Afterbody 1b launches for ultrasonic wave
End, the ultrasonic signal that ranging is resolved for asynchronous type can be launched；There are laser triggered circuit and ultrasonic wave in the inside of teaching pen 1
Oscillating circuit, for triggering infrared laser and ultrasonic signal；The pen body of teaching pen 1 is provided with nine 38mm*30mm*2mm too
Positive energy plate, coordinates the pressure limiting charging circuit inside teaching pen 1, the rechargeable battery inside teaching pen 1 is charged, realize green
The long-time continuation of the journey of environmental protection.
In the present invention, the asynchronous type resolving location algorithm principle set in ATMega128 singlechip chips 8 is shown in Fig. 3, calculates
Principle is as follows：
L=1m is set, can obtain by the cosine law:
So as to have：
Rectangular coordinate system is established as schemed, can obtain the x of launch point, y-coordinate meets：
x2+y2=m2
(2-x)2+y2=(m+b)2
It can resolve to obtain：
The final coordinate position that launch point is determined.
The present invention takes into account the advance of equipment and the health of human body in performance, combines conventional teaching teaching aid and more matchmakers
The advantages of body teaching aid, its adverse effect brought respectively is evaded most possibly.Such as：The electronics chalk function of the present invention
Traditional dust-free chalk (micronic dust chalk) can be substituted, and thoroughly solves micronic dust that it is likely to occur and content of beary metal is exceeded
Problem；The electronics chalk function of the present invention can equally substitute liquid chalk and white board marker, and save ink and special scrubbing brush
Expenditure, reduce the requirement to blackboard finish；The aerial writing function of the present invention can substitute multi-media whiteboard, with
The combination of multimedia teaching and conventional teaching is realized, and the input of complete equipment is far below electronic whiteboard.The erasing work(of this product
Dustless environment protecting dust catcher blackboard brush can be substituted, and reduce noise pollution.
Meanwhile present invention reduces total input of equipment, largely save the expenditure of equipment in educational investment.With make at present
Compared with main product-multi-media whiteboard most extensive, that effect is best, initial cost of the invention is 2436 yuan, much low
In 15000 yuan of multi-media whiteboard.Issued a few days ago by the Ministry of Education《The national special inspection report of IT application in education sector work》
Statistics, by November, 2014, the ratio of national middle and primary schools' access internet is equipped with the ratio of multimedia teaching facility up to 82%
Example is up to 78%.With the progress of science and technology and the increase of teaching input, multimedia teaching facility will turn into main flow.If the present invention can
To be promoted the use of in the whole nation, substantial amounts of teaching equipment input will be saved.Moreover, compared with multi-media whiteboard, the present invention
Compared with based on, maintenance is easier to the equipment used, and precision be able to can be guaranteed by program debugging, sensitivity.This is simultaneously
Reduce its operating cost and maintenance cost.
Claims (8)
1. a kind of Visual Teaching display systems, including projecting apparatus, the projection screen for receiving projector image signal, for pair
The computer of projection screen input image information, it is characterised in that also include：
Teaching pen, with Laser emission end and ultrasonic wave transmitting terminal, it is respectively used to launch laser signal and ultrasonic signal；
Camera, the light spot signal that acquired projections screen comes up from laser transmitting terminal, obtains dot pattern picture；
At least three ultrasonic receivers, the ultrasonic signal is received, obtain at least three different reception time signals；
Computing chip, teaching pen location coordinate information is calculated according to the time signal of reception；
The computer receives described dot pattern picture or teaching pen location coordinate information, and dot pattern picture is handled, and obtains
To luminous point coordinate information；Built-in picture function is called according to luminous point coordinate information or teaching pen location coordinate information, generates phase
The luminous point image coordinate or teaching pen position coordinates image answered, and luminous point image coordinate or teaching pen position coordinates image are exported
To the projecting apparatus；
It is described using threshold process principle and template matches principle and with algorithm when the computer is handled dot pattern picture
Threshold process principle and template matches principle are simultaneously comprised the following steps with algorithm：
(1) samples pictures of the collection in advance with corresponding laser spot, and preserved as template picture；
(2) according to the color rgb value and HSV value of setting, binary conversion treatment is done to the dot pattern picture of camera input；
(3) image of binary conversion treatment is handled using template matching algorithm and template picture, obtains luminous point coordinate information；
Step (2) includes the dot pattern picture for reading camera input；Judge whether recorded luminous point coordinate information；Such as
Fruit is present, then in dot pattern picture, obtains the pixel positioned at the recorded luminous point coordinate periphery, and according to the face of setting
Color rgb value and HSV value, binary conversion treatment is carried out to the image of scanning；If it does not exist, then the institute in dot pattern picture is obtained one by one
There is pixel, and according to the color rgb value and HSV value of setting, binary conversion treatment is carried out to the image of scanning；
Step (3) is included according to apart from size, region division is carried out to the image after binary conversion treatment between pixel；Such as when
When the distance between two pixels meet to require, then it is assumed that two pixels belong to a region, judge one by one successively be
Can；Noise spot is removed according to area size；With point-by-point in image of the preprepared template picture after above-mentioned zone division
It is mobile, difference quantization is carried out with the opencv functions provided, difference Minimum Area is found, judges whether qualified area
Domain；If there is no satisfactory region, recorded luminous point coordinate information is removed, updates the luminous point coordinate letter recorded
Breath, return to step (2).
2. Visual Teaching display systems according to claim 1, it is characterised in that the ultrasonic receiver is three
Individual, three ultrasonic receivers are equidistantly linearly installed.
3. Visual Teaching display systems according to claim 1 or 2, it is characterised in that three ultrasonic waves receive
Device is installed in a plate face to be write, and the plate face to be write is arranged in classroom.
4. Visual Teaching display systems according to claim 1 or 2, it is characterised in that the computing chip passes through interior
The asynchronous type geometry put resolves location algorithm and teaching pen location coordinate information is calculated.
5. Visual Teaching display systems according to claim 1 or 2, it is characterised in that teaching pen institute consuming electric power
Supplied by built-in solar panel and pressure limiting charging circuit.
6. Visual Teaching display systems according to claim 1 or 2, it is characterised in that the figure of the camera shooting
As signal by wireless WiFi form is delivered to computer.
7. Visual Teaching display systems according to claim 1 or 2, it is characterised in that the teaching pen ultrasonic wave hair
The cone structure that end bottom is 45 ° is penetrated, ultrasonic signal is uniformly diffused to by all directions by the cone structure.
8. Visual Teaching display systems according to claim 1 or 2, it is characterised in that computer receives a light
When point coordinates information or teaching pen location coordinate information, it is first determined whether in the presence of the luminous point coordinate information or teaching pen that have recorded
Location coordinate information, if so, then calling built-in picture function, draw lines and more new record between this 2 points；If
No, then current luminous point coordinate information or teaching pen location coordinate information are recorded, more new record.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510289264.8A CN104965625B (en) | 2015-05-28 | 2015-05-28 | A kind of Visual Teaching display systems |
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| CN201510289264.8A CN104965625B (en) | 2015-05-28 | 2015-05-28 | A kind of Visual Teaching display systems |
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| CN104965625A CN104965625A (en) | 2015-10-07 |
| CN104965625B true CN104965625B (en) | 2018-03-23 |
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| CN108874181B (en) * | 2017-05-08 | 2023-05-09 | 富泰华工业（深圳）有限公司 | Electronic device with laser pen marking function and laser pen marking method |
| CN107203286A (en) * | 2017-06-13 | 2017-09-26 | 余昆 | Possesses the laser pen of editting function |
| CN109910476B (en) * | 2019-03-26 | 2020-08-28 | 徐州工业职业技术学院 | Blackboard teaching auxiliary system |
| CN111462543B (en) * | 2020-05-18 | 2024-07-12 | 南京林业大学 | Show stand is used in teaching with laser assistance-localization real-time function |
| CN111631512A (en) * | 2020-05-29 | 2020-09-08 | 辽东学院 | Intelligent integrated multimedia platform for image design |
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| CN1605927A (en) * | 2003-10-10 | 2005-04-13 | 日本电气视象技术株式会社 | Projector and projector accessory |
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| CN102707817A (en) * | 2012-04-24 | 2012-10-03 | 广州市唯昕电子科技有限公司 | Laser writing system |
| CN104123018A (en) * | 2014-06-26 | 2014-10-29 | 深圳市成鑫微光电科技有限公司 | Optical projection and screen image locating system and locating method thereof |
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| CN1605927A (en) * | 2003-10-10 | 2005-04-13 | 日本电气视象技术株式会社 | Projector and projector accessory |
| CN1740958A (en) * | 2005-06-14 | 2006-03-01 | 袁芳革 | Ultrasonic positioning control device and method thereof |
| CN102707817A (en) * | 2012-04-24 | 2012-10-03 | 广州市唯昕电子科技有限公司 | Laser writing system |
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