CN207503173U - A kind of interactive holographic blackboard system - Google Patents
A kind of interactive holographic blackboard system Download PDFInfo
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- CN207503173U CN207503173U CN201720754560.5U CN201720754560U CN207503173U CN 207503173 U CN207503173 U CN 207503173U CN 201720754560 U CN201720754560 U CN 201720754560U CN 207503173 U CN207503173 U CN 207503173U
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Abstract
The utility model embodiment provides a kind of interactive holographic blackboard system, and including L-type projecting apparatus, positioning teacher's pointer, motion capture equipment and server, server is flutterred respectively with L-type projecting apparatus, action to be caught equipment and be connected.L-type projecting apparatus is used to receive the video signal and switching signal of server input, and is additionally operable to switch over projection content according to switching signal respectively to preset vertical plane, horizontal plane vector projection image using video signal；Teacher's pointer is positioned to be used for the operation shift position of user, and emit teacher's pointer positioning signal；Action, which is flutterred, catches equipment for capturing teacher's pointer positioning signal, and teacher's pointer positioning signal is output to server；Server is used for output image signal, and the real time position of positioning teacher's pointer is determined according to teacher's pointer positioning signal, and export switching signal according to real time position.It is achieved thereby that it is interacted between the image projected and the action of user, so as to improve usage experience of the user in teaching.
Description
Technical field
The utility model is related to educational supply technical field, more particularly to a kind of interactive holographic blackboard system.
Background technology
Blackboard is a kind of important educational aid, and blackboard is not the plate face for refering in particular to black in fact, says that it is in traditional sense
One can be with the plane of repeated writing, and plate face is hard.Blackboard generally made of the materials such as plank or ground glass, can use powder
The specific writing material such as pen writes above, mostly black, blackish green, white or ecru.With science and technology progress,
At present in school and all kinds of training organizations, have begun universal projecting apparatus or other electronic display units carry out education informations
Display.
When easy wipe relative to blackboard is easily write for this interaction characteristic, user is right when being imparted knowledge to students using projecting apparatus
The operation of institute's transmission information is more troublesome, and can not provide interaction characteristic to the user, and body is used in teaching so as to cause user
It tests poor.
Utility model content
In view of this, the utility model provides a kind of interactive holographic blackboard system, to solve to carry out using projecting apparatus
Interactivity is poor during teaching, so as to cause user experience it is poor the problem of.
To solve the above-mentioned problems, it the utility model discloses a kind of interactive holographic blackboard system, is projected including L-type
Instrument, positioning teacher's pointer, motion capture equipment and server, the server are flutterred with the L-type projecting apparatus, action respectively and catch equipment phase
Connection, wherein：
The L-type projecting apparatus is used to receive the video signal and switching signal of the server input, and utilizes the shadow
Picture signal to preset vertical plane, horizontal plane vector projection image, is additionally operable to according to the switching signal to projection respectively
Content switches over, and the vertical plane is adjacent with the horizontal plane；
The positioning teacher's pointer with the operation shift position of user, and emits teacher's pointer positioning signal for being held for user；
The action, which is flutterred, catches equipment for capturing the teacher's pointer positioning signal, and the teacher's pointer positioning signal is output to institute
State server；
The server is used to export the video signal, and determine the positioning teacher's pointer according to the teacher's pointer positioning signal
Real time position, and the switching signal is exported according to the real time position.
Optionally, the L-type projecting apparatus includes the first projecting apparatus and the second projecting apparatus, wherein：
First projecting apparatus is used to project image to the vertical plane；
Second projecting apparatus is used to project image to the horizontal plane.
Optionally, the positioning teacher's pointer includes teacher's pointer ontology and the first signal transmitter unit, wherein：
The teacher's pointer ontology is used to hold for user；
First signal transmitter unit is arranged on the teacher's pointer ontology, for emitting teacher's pointer positioning signal.
Optionally, first signal transmitter unit is radio positioning signal transmitter unit or optical signal launch unit.
Optionally, which is characterized in that anaglyph spectacles are further included, wherein：
The anaglyph spectacles are used to observe the stereopsis of the L-type projector projects for user.
Optionally, the anaglyph spectacles are shutter stereo spectacles, wherein：
The shutter stereo spectacles are used for according to the synchronized signal that the server exports to the translucency of eyeglass
It switches over.
Optionally, second signal transmitter unit is provided on the anaglyph spectacles, wherein：
For emitting glasses positioning signal, the server is used to be caught according to the action second signal transmitter unit
The glasses positioning signal for catching unit acquisition determines the position of user, and according to the position of the user and the real-time position of the teacher's pointer
Put the output switching signal.
Optionally, the second signalling transmitter unit is radio positioning signal transmitter unit or optical signal launch unit.
It can be seen from the above technical proposal that the utility model provides a kind of interactive holographic blackboard system, including L-type
Projecting apparatus, positioning teacher's pointer, motion capture equipment and server, server is flutterred respectively with L-type projecting apparatus, action to be caught equipment and is connected
It connects.L-type projecting apparatus is used to receive the video signal and switching signal of server input, and using video signal respectively to preset
Vertical plane, horizontal plane vector projection image, be additionally operable to according to switching signal to projection content switch over, vertical plane with
Horizontal plane is adjacent；Positioning teacher's pointer for user for holding, and with the operation shift position of user, and emits teacher's pointer positioning letter
Number；Action, which is flutterred, catches equipment for capturing teacher's pointer positioning signal, and teacher's pointer positioning signal is output to server；Server is for defeated
Go out video signal, and the real time position of positioning teacher's pointer is determined according to teacher's pointer positioning signal, and switching letter is exported according to real time position
Number.Corresponding switching signal is exported, and L-type projecting apparatus exists to L-type projecting apparatus to the real time position for positioning teacher's pointer by server
The image that it is projected is switched under the control of switching signal, realizes and is handed between projected image and the action of user
Mutually, user can utilize the positioning teacher's pointer in mobile hand easily to switch image, so as to improve use of the user in teaching
Experience.
Description of the drawings
It in order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of structure diagram of interactive holographic blackboard system embodiment provided by the utility model；
Fig. 2 is the structure diagram of another interactive holographic blackboard system embodiment provided by the utility model.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
All other embodiments obtained shall fall within the protection scope of the present invention.
Embodiment one
Fig. 1 is a kind of structure diagram of interactive holographic blackboard system embodiment provided by the utility model.
As shown in Figure 1, interactive holographic blackboard system provided in this embodiment is used to be imparted knowledge to students or trained for user to carry
It is supported for image, specifically includes L-type projecting apparatus 10, the positioning teacher's pointer 20 with setting element, motion capture equipment 30 and server
40, wherein, which is connected respectively with L-type projecting apparatus, motion capture equipment.
Server memory contains corresponding image data, is connected by data line or radio connection with L-type projecting apparatus
Connect, can image data be output to by L-type projecting apparatus in a manner of video signal above-mentioned connection mode so that projecting apparatus to
Predetermined plane projects image.
For projecting the L-type projecting apparatus of image on two planar, one of plane to be vertical by image projection
Vertical plane 100 in ground, another plane are horizontal plane 200 parallel to the ground, and two planes are in 90 degree of angles,
And be disposed adjacent, for the image projected by user's presentation L-type projecting apparatus.
The L-type projecting apparatus includes the projecting apparatus of two autonomous workings, respectively the first projecting apparatus 11 and the second projecting apparatus
12, the first projecting apparatus is used for vertical plane upslide projection picture, and the second projecting apparatus is used for horizontal plane upslide projection picture, so as to
The image space of a panoramic effect is built for user.
For positioning teacher's pointer for being held for user, and the shift position under the drive of user, the positioning teacher's pointer is fixed for emitting
Position signal carries out motion capture for motion capture equipment.Specifically, which includes the teacher's pointer ontology held for user
With the first signal transmitter unit 21 being arranged on teacher's pointer ontology.
First signal transmitter unit positions letter for emitting the teacher's pointer positioned for motion capture device to the teacher's pointer
Number, it can be the radio positioning signal transmitter unit for emitting radio positioning signal to treat the first signal transmitter unit, can also
It is the light emitting unit for emitting optical locating signal.As light emitting unit, be used for according to certain rules, periodic emission flicker
Signal, the flash signal form certain coding.
Motion capture equipment is used to obtain the teacher's pointer positioning signal of positioning teacher's pointer transmitting, and teacher's pointer positioning signal is sent
To server.
Motion capture Motion capture, abbreviation Mocap.Be related in dimensional measurement, physical space the positioning of object and
Bearing measurement etc. can directly be understood the data of processing by computer.
With the raising that the rapid development and cartoon making of computer hardware technique require, in developed country, action is caught
It catches and has come into practical stage, have the motion capture equipment that multiple commercial vendors have launched a variety of commercializations, such as
MotionAnalysis, Polhemus, Sega Interactive, MAC, X-Ist, FilmBox etc. are successfully used to virtual
Many aspects such as reality, game, ergonomics research, simulated training, biomechanics Research.
For the angle of technology, the essence of motion capture seeks to measure, track, records object in three dimensions
Movement locus.Typical motion capture equipment is generally made of following components：
Sensor, so-called sensor are integrally fixed at the tracks of device of moving object privileged site, it will be to Motion
Capture systems provide the location information of moving object campaign, and the number of tracker can be generally determined with the careful degree of capture
Mesh.
Signal capture equipment.This equipment can when the type of Motion capture systems is different different from, they
It is responsible for the capture of position signal.It is one piece of wiring board for capturing electric signal for mechanical system, for optics Motion
Capture systems are then high-resolution thermal cameras.
Data transmission set.Motion capture systems, in particular for the Motion capture systems of live effect
A large amount of exercise data is rapidly and accurately transferred to computer system from signal capture equipment and handled by system needs, and data
Transmission device is exactly for completing this work.
Data processing equipment.Also to have after the data that Motion capture systems capture are needed to correct, be handled
Threedimensional model could complete the work of computer animation to combination, this just needs us to apply data processing software or hardware
To complete this work.Software might as well hardware they be all that number is completed to the operational capability of data high-speed by computer
According to processing, make threedimensional model really, naturally move.Specifically there are mechanical motion capture, the motion capture of acoustics formula, electricity
Magnetic-type motion capture, optical profile type motion capture and inertial navigation formula motion capture etc. are several.
Mechanical action is captured tracks and measures movement locus by mechanical device.Typical system by multiple joints and
Rigid link forms, and equipped with angular transducer in rotatable joint, can measure the situation of change of articulation angle.Dress
When putting movement, the length of angle change and connecting rod according to measured by angular transducer, it can be deduced that rod piece distal point is in space
In position and movement locus.In fact, the movement locus of any point can be obtained on device, rigid link can also change
The telescopic rod variable into length, with the variation of its length of displacement sensor.
A kind of mechanical action trap setting of early stage is " adjustable with the joint with angular transducer and connecting rod composition one
Posture mathematical model ", shape can simulate human body, can also simulate other animals or object.User can be according to plot
Need adjust model posture, then lock.Angular transducer measures and records the rotational angle in joint, according to these angles
With the mechanical dimension of model, the posture of model can be calculated, and these attitude datas are transmitted to animation software, make role therein
Model also makes the same posture.This is a kind of motion capture device more early occurred, but still has certain market up to now.
Foreign countries give this device very vivid name：" monkey ".
A kind of application form that mechanical action captures is that the moving object for being intended to capture is connected with mechanical structure, object fortune
It is dynamic to drive mechanical device, so as to be recorded in real time by sensor.
The advantages of this method is at low cost, and precision is also higher, can accomplish to measure in real time, it is same to can also allow for multiple roles
When perform.But its shortcoming is also clearly, mainly uses very inconvenient, and mechanical structure hinders the action of performing artist
It is very big with limiting.And " monkey " more difficult real-time capture for continuous action, operator is needed constantly to require to adjust according to plot "
The posture of monkey ", it is pretty troublesome, it is mainly used for determining for static moulding capture and key frame.
Common acoustics formula motion capture device is made of transmitter, receiver and processing unit.Transmitter is one solid
Fixed supersonic generator, receiver are generally made of three ultrasonic probes being triangularly arranged.By measuring sound wave from hair
Time or phase difference of the device to receiver are sent, the position and direction of receiver can be calculated and determined in system.
This kind of installation cost is relatively low, but has larger delay and lag to the capture of movement, and real-time is poor, and precision is generally not
It is very high, cannot have between sound source and receiver it is big block object, interfered by noise and multiple reflections etc. larger.Due to sound in air
The speed of wave is related with air pressure, humidity, temperature, so corresponding compensation must also be made in the algorithm.
It is more commonly used motion capture equipment that electromagnetic action, which captures system,.Generally by emission source, receiving sensor and
Data processing unit forms.Emission source generates the electromagnetic field by the distribution of certain time and space idea in space；Receiving sensor (usually has
10~20) be placed in the key position of actor body, as the action of performing artist moves in electromagnetic field, by cable or
Wireless mode is connected with data processing unit.
When performing artist performs in electromagnetic field, receiving sensor sends the signal received to processing list by cable
Member can calculate the spatial position and direction of each sensor according to these signals.Polhemus companies and Ascension are public
Department is famous to produce electromagnetic action capture equipment.The sampling rate of this kind of system be generally 15~120 times per second (according to
Rely the quantity in model and sensor), in order to eliminate shake and interference, sampling rate is generally in below 15Hz.For some height
Speed movement, such as boxing, Basketball Match, the sample rate are not met by requiring.The advantages of electromagnetic action captures exists first
What it is in its record is sextuple information, i.e., can not only obtain spatial position, moreover it is possible to obtain directional information, this point is to certain special
Application scenario is very valuable.Secondly speed is fast, real-time is good, and when performing artist performs, actor model in animation system can be with
Simultaneous reactions, convenient for rehearsing, adjusting and change.The calibration of device is fairly simple, and technology is more ripe, and robustness is good, and cost is opposite
It is cheap.
Its shortcomings that, is stringent to environmental requirement, cannot have metal near performance venue, no it will cause electricity
The distortion of field influences precision.System allows performance range smaller than optical profile type, and particularly cable limits the activity of performing artist
It is bigger, more violent movement and performance are not applied to then.
The task that optical profile type motion capture is captured by the monitoring to specific luminous point in target and tracking come execution.Often
The optical profile type motion capture seen is mostly based on principle of computer vision.In theory, for a point in space, as long as it
Can be two camera findings simultaneously, then the image and camera parameter according to captured by two cameras of synchronization, it may be determined that this
The one moment position of point in space.When camera is continuously shot with sufficiently high rate, can be obtained from image sequence
To the movement locus of the point.
Typical optical profile type motion capture system is arranged usually using 6~8 cameras around performance venue, these cameras
Visual field overlapping region is exactly the actuating range of performing artist.For the ease of processing, usually require that performing artist puts on monochromatic clothes,
Some special marks or luminous point are sticked in the key position of body, such as joint, hip, elbow, wrist position, referred to as "
Marker ", vision system will identify and handle these marks.After system calibration, camera is continuously shot the action of performing artist, and will
Image sequence preserves, and is then analyzed and is handled again, identifies index point therein, and calculates it in every flashy sky
Between position, and then obtain its movement locus.Accurate movement locus in order to obtain, camera should have higher capture rate, generally
Reach more than 60 frame per second.
If the countenance key point in performing artist sticks Marker, it can realize that expression captures, most of expression
It captures and all uses optical profile type.
Some optics motion capture systems are extracted not against Marker as distinguishing mark, such as according to the silhouette of target
Its movable information simplifies processing procedure etc. using the background for having grid.Researcher studying not against Marker and
Application image identification, analytical technology, by vision system Direct Recognition actor body key position and measure its movement locus
Technology, estimation will put into practicality quickly.
The advantages of optical profile type motion capture is that performing artist's scope of activities is big, and the limitation of no cable, mechanical device, performing artist can
It is very convenient to use freely to perform.Its sampling rate is higher, can meet the needs that most high-speed motions measure.Marker
Quantity can purchase addition according to practical application, expand convenient for system.
The shortcomings that this method is system price costliness, it can capture real time kinematics, but post-process (including Marker's
Identification, tracking, the calculating of space coordinate) workload it is larger, be suitble to scientific research class application.
Performing artist is measured by inertial navigation sensors AHRS (attitude heading reference system), IMU (Inertial Measurement Unit) to move
The characteristics such as acceleration, orientation, inclination angle.[6] it is not influenced by environmental disturbances, is not afraid of and blocks.It is high to capture accuracy, sample rate
Height reaches 1000 times per second or higher.It is small, size is small, light-weight, cost performance due to using highly integrated chip, module
It is high.Inertial navigation sensor is worn on performing artist's head or by 17 sensor composition datas clothes wearing, by USB line, bluetooth,
2.4Gzh DSSS are wirelessly waited and are connected with host, can track head, double respectively, real-time display completely acts.
After the server receives teacher's pointer positioning signal, it can be set according to the space coordinates of default settings, motion capture
The standby position in the space coordinates calculates the real time position of positioning teacher's pointer, and the real-time position is determined after the real time position is obtained
Put whether corresponding space coordinate reflects that user needs to switch over image, when judgement needs switching, to L-type projecting apparatus
Export switching signal.
L-type projecting apparatus is believed in the video signal exported according to server carries out image projection process when receiving switching
After number, the image projected is switched over, is interacted so as to fulfill the action between image and user.
It can be seen from the above technical proposal that present embodiments providing a kind of interactive holographic blackboard system, thrown including L-type
Shadow instrument, positioning teacher's pointer, motion capture equipment and server, server is flutterred respectively with L-type projecting apparatus, action to be caught equipment and is connected.L
Type projecting apparatus is used to receive the video signal and switching signal of server input, and using video signal respectively to preset vertical
Plane, horizontal plane vector projection image are additionally operable to switch over projection content according to switching signal, vertical plane and level
Plane is adjacent；Positioning teacher's pointer with the operation shift position of user, and emits teacher's pointer positioning signal for being held for user；It is dynamic
It flutters and catches equipment for capturing teacher's pointer positioning signal, and teacher's pointer positioning signal is output to server；Server is used to export shadow
As signal, and determine according to teacher's pointer positioning signal the real time position of positioning teacher's pointer, and switching signal is exported according to real time position.It is logical
It crosses server and corresponding switching signal is exported to L-type projecting apparatus, and L-type projecting apparatus is believed in switching to the real time position for positioning teacher's pointer
Number control under the image that it is projected is switched over, realize and interacted between projected image and the action of user, user
The positioning teacher's pointer in mobile hand can be utilized easily to switch image, so as to improve usage experience of the user in teaching.
Embodiment two
Fig. 2 is the structure diagram of another interactive holographic blackboard system embodiment provided by the utility model.
Interactive mode blackboard system provided in this embodiment is to be additionally arranged to wear for user on the basis of a upper embodiment
Anaglyph spectacles 50.
In user's wearing after the anaglyph spectacles, the solid that above-mentioned L-type projecting apparatus is launched can be watched in a manner of three-dimensional
Image, so as to further improve the usage experience of user.
The preferred shutter stereo spectacles of the anaglyph spectacles, shutter stereo spectacles by be switched fast the translucency of eyeglass come
It realizes that user's right and left eyes watch different picture frames, in the case of having small parallax between adjacent picture frame, passes through two
The image for having the time difference acquired in eyes makes user experience three-dimensional image.The switching and L-type for making shutter stereo spectacles are thrown
It is synchronous between the image that shadow instrument is transmitted.
Second signal transmitter unit 51 is additionally provided on shutter stereo spectacles, which is used to send out
Penetrate the glasses positioning signal for carrying out motion capture to the head of user for motion capture device.The second signal transmitter unit is similary
To be used to emit the radio positioning signal transmitter unit of radio positioning signal or for emitting the light of optical locating signal hair
Penetrate unit.As light emitting unit, be used for according to certain rules, periodic emission flash signal, flash signal composition is certain
Coding.
Motion capture equipment is used to obtain the glasses positioning signal that the second signal transmitter unit is emitted and is output to clothes
Business device, server is after glasses positioning signal is received, according to head of the positioning principle to glasses, that is, user to positioning teacher's pointer
The position at place is calculated, and then exports corresponding switching signal according to the real time position of the position of glasses and positioning teacher's pointer.
It can be combined thereby using family by the position of self-position and positioning teacher's pointer and image is switched over, so as to abundant road
Each embodiment in this specification is described by the way of progressive, the highlights of each of the examples are with
The difference of other embodiment, just to refer each other for identical similar part between each embodiment.
Although the preferred embodiment of the utility model embodiment has been described, those skilled in the art once learn
Basic creative concept, then can make these embodiments other change and modification.So appended claims are intended to solve
It is interpreted as including preferred embodiment and falls into all change and modification of the utility model embodiment range.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering non-exclusive inclusion, so that process, method, article or terminal device including a series of elements are not only wrapped
Those elements are included, but also including other elements that are not explicitly listed or are further included as this process, method, article
Or the element that terminal device is intrinsic.In the absence of more restrictions, it is wanted by what sentence "including a ..." limited
Element, it is not excluded that also there are other identical elements in the process including the element, method, article or terminal device.
Technical solution provided by the utility model is described in detail above, specific case pair used herein
The principle and embodiment of the utility model is expounded, and the explanation of above example is only intended to help to understand that this practicality is new
The method and its core concept of type；Meanwhile for those of ordinary skill in the art, according to the thought of the utility model, having
There will be changes in body embodiment and application range, in conclusion the content of the present specification should not be construed as to this practicality
Novel limitation.
Claims (8)
1. a kind of interactive holographic blackboard system, which is characterized in that including L-type projecting apparatus, positioning teacher's pointer, motion capture equipment and
Server, the server are flutterred with the L-type projecting apparatus, action respectively and catch equipment and be connected, wherein：
The L-type projecting apparatus is used to receive the video signal and switching signal of the server input, and is believed using the image
Image is projected to preset vertical plane, horizontal plane number respectively, is additionally operable to carry out projection content according to the switching signal
Switching, the vertical plane are adjacent with the horizontal plane；
The positioning teacher's pointer with the operation shift position of user, and emits teacher's pointer positioning signal for being held for user；
The action, which is flutterred, catches equipment for capturing the teacher's pointer positioning signal, and the teacher's pointer positioning signal is output to the clothes
Business device；
The server is used to export the video signal and the switching signal.
2. interactive holographic blackboard system as described in claim 1, which is characterized in that the L-type projecting apparatus includes first and throws
Shadow instrument and the second projecting apparatus, wherein：
First projecting apparatus is used to project image to the vertical plane；
Second projecting apparatus is used to project image to the horizontal plane.
3. interactive holographic blackboard system as described in claim 1, which is characterized in that the positioning teacher's pointer includes teacher's pointer ontology
With the first signal transmitter unit, wherein：
The teacher's pointer ontology is used to hold for user；
First signal transmitter unit is arranged on the teacher's pointer ontology, for emitting teacher's pointer positioning signal.
4. interactive holographic blackboard system as claimed in claim 3, which is characterized in that first signal transmitter unit is nothing
Line positioning signal transmitter unit or optical signal launch unit.
5. such as the interactive holographic blackboard system of Claims 1 to 4 any one of them, which is characterized in that anaglyph spectacles are further included,
Wherein：
The anaglyph spectacles are used to observe the stereopsis of the L-type projector projects for user.
6. interactive holographic blackboard system as claimed in claim 5, which is characterized in that the anaglyph spectacles are three-dimensional for shutter
Glasses, wherein：
The synchronizing signal that the shutter stereo spectacles are used to be exported according to the server switches over the translucency of eyeglass.
7. interactive holographic blackboard system as claimed in claim 5, which is characterized in that be provided with second on the anaglyph spectacles
Signal transmitter unit, wherein：
For emitting glasses positioning signal, the server is used for according to the motion capture list second signal transmitter unit
The glasses positioning signal that member obtains determines the position of user, and defeated according to the position of the user and the real time position of the teacher's pointer
Go out the switching signal.
8. interactive holographic blackboard system as claimed in claim 7, which is characterized in that the second signal transmitter unit is nothing
Line positioning signal transmitter unit or optical signal launch unit.
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| CN201720754560.5U CN207503173U (en) | 2017-06-26 | 2017-06-26 | A kind of interactive holographic blackboard system |
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