CN113888907B - Mobile projection type fine class video line-of-sight guiding system - Google Patents
Mobile projection type fine class video line-of-sight guiding system Download PDFInfo
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- CN113888907B CN113888907B CN202111156544.3A CN202111156544A CN113888907B CN 113888907 B CN113888907 B CN 113888907B CN 202111156544 A CN202111156544 A CN 202111156544A CN 113888907 B CN113888907 B CN 113888907B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B5/00—Electrically-operated educational appliances
- G09B5/02—Electrically-operated educational appliances with visual presentation of the material to be studied, e.g. using film strip
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Educational Technology (AREA)
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- Projection Apparatus (AREA)
Abstract
The invention discloses a mobile projection type fine class video sight guiding system, which comprises a projection screen, a courseware computer, a projector, an electric control cradle head and a control console, wherein the projection screen is connected with the courseware computer; the projector is arranged on the electric control cradle head; the console controls the electric control cradle head to move, so that courseware captions can move in different areas of the projection screen; in the course of courseware subtitle movement, the sight of a teacher can naturally move along with the courseware subtitle, so that the sight is always concentrated at a certain position in the course of teaching of the teacher, the sight is prevented from being dull, the displayed course video picture is more vivid and natural, and the teaching effect is improved.
Description
Technical Field
The invention relates to the technical field of recording and broadcasting equipment, in particular to a movable projection type fine class video line-of-sight guiding system.
Background
With the rapid development of online education, online courses such as fine courses and mouses are greatly developed in recent years, so that a large number of video courses need to be manufactured, in most video courses, teachers need to appear in video pictures for increasing the communication feeling of teachers and students and improving the teaching effect, but at present, because teachers generally lack the training of lectures in front of a camera, and meanwhile, most of recording sites of the video courses are free of students, so that some common defects of the video courses are inevitably caused:
1. most of the fine class recording sites are free of students, many teachers are very unaccustomed, cannot find the feeling of the lectures, do not know where to look at the sight, often feel handicapped and dull, and the recording effect is poor.
2 the exquisite class is recorded and is different on the lesson at ordinary times, needs the content to refine, and the lecture is smooth, so when recording, so many lecture teachers can be at opposite installation a screen that shows courseware subtitle, plays the effect of suggestion lecture content, but this kind of mode, because fixed unchangeable when the position of screen, always watch a direction at teacher's teaching in-process, the picture effect appears unnatural, and the spectator sees the teacher very easily and is watching the word subtitle, influences the teaching effect.
Disclosure of Invention
The invention aims to solve the technical problem of providing a mobile projection type video-recording vision guiding system capable of guiding the vision direction of a teacher, which can guide the teacher to keep the natural state of vision communication and improve the video-recording teaching quality of the fine lesson.
In order to solve the technical problems, the technical scheme of the invention is as follows: the mobile projection type fine class video sight guiding system comprises a projection screen, a courseware computer, a projector, an electric control cradle head and a control console;
the projection screen is arranged opposite to the platform and used for displaying courseware captions;
the courseware computer is used for generating courseware subtitles;
the projector is arranged on the electric control holder, is connected with the courseware computer and is positioned in front of the projection screen, courseware subtitles generated on the courseware computer are projected onto the projection screen through the projector, the courseware subtitles are displayed on the projection screen, and the size of the projection screen is larger than the size of the area occupied by the courseware subtitles displayed on the projection screen;
the control console comprises a sight line guiding control module which is in signal connection with the electric control console, a console control rocker which is connected with the sight line guiding control module is further arranged on the control console, and the console control rocker controls the electric control console to move through the sight line guiding control module so as to control the movement direction and the movement speed of the projector;
the control console is also provided with a target position shortcut key connected with the sight line guiding control module, the sight line guiding control module can preset target position data of the electric control cloud deck, and when the target position shortcut key is pressed down, the sight line guiding control module controls the electric control cloud deck to rotate to a corresponding position according to the preset target position data.
As a preferable technical scheme, the projection screen is provided with a light-transmitting and light-reflecting area, and the light-transmitting and light-reflecting area consists of a light-transmitting and light-reflecting unit array;
the light-transmitting and reflecting unit comprises a light hole, a light hole frame is arranged on the periphery of the light hole, a shading and reflecting part arranged on the light hole frame is arranged on the upper portion of the light hole, a reflecting surface inclining downwards is arranged on the outer side of the shading and reflecting part, diffuse reflection materials are arranged on the reflecting surface, light from the projector is reflected to the direction of a platform through the reflecting surface, a teacher can see a projection image, and shadows formed by the shading and reflecting part irradiated by the projector completely cover the light hole; the surfaces of the rest parts except the reflecting surface of the light-transmitting and reflecting unit are all made of light-absorbing materials, and the length and the width of any light-transmitting and reflecting unit are smaller than 1mm.
As an optimal technical scheme, the sight line guiding system further comprises a signal adder which is respectively connected with the courseware computer, the console and the projector;
the control console also comprises a media playing module, wherein media signals played by the media playing module and courseware subtitles output by the courseware computer are respectively transmitted to the signal superposition device, and the signal superposition device is used for superposing the media signals on the media playing module and the courseware subtitles of the courseware computer and then transmitting the superposed media signals and the courseware subtitles to the projector.
As a preferable technical solution, the sight line guiding system further includes a rotation angle detector for measuring a rotation angle of the teacher's head, the rotation angle detector including a gyroscope, an angle detection circuit for detecting a rotation angle data signal of the gyroscope and transmitting the rotation angle data signal to the wireless transmission circuit;
the control console further comprises a wireless receiving circuit corresponding to the wireless transmitting circuit, the wireless receiving circuit receives the rotating angle data signals transmitted by the wireless transmitting circuit and transmits the rotating angle data signals to the sight line guiding control module, and the sight line guiding control module drives the electric control cradle head to move so as to control the movement direction and movement speed of the projector;
the control console is also provided with an active and passive switching key for switching an active guiding mode and a passive tracking mode, when the active and passive switching key is pressed, the sight line guiding control module can switch between the active guiding mode and the passive tracking mode, and when the sight line guiding control module is in the active guiding mode, the sight line guiding control module receives control signals of the pan-tilt control rocker and the target position shortcut key; when the sight line guiding control module is in the passive tracking mode, the sight line guiding control module receives the rotation angle data signal received by the wireless receiving circuit.
As a preferable technical solution, the projection screen is configured as a circular arc type screen, and the projector is installed at a position above a center of the circular arc type screen.
Due to the adoption of the technical scheme, the invention has the beneficial effects that: in the teaching process, the control console can control the electric control cradle head to move, so that the movement of the projector is regulated, courseware captions displayed on the projection screen can move to different areas of the projection screen, the vision of a teacher can move along with the courseware captions in the moving process of the courseware captions, the vision can not be always concentrated at a certain position in the teaching process of the teacher, the vision can naturally move, the displayed video images of courses are more natural, and the user can not be found to watch the courseware captions, so that the teaching effect is improved.
Drawings
The following drawings are only for purposes of illustration and explanation of the present invention and are not intended to limit the scope of the invention. Wherein:
FIG. 1 is a top view structural layout of an embodiment of the present invention;
FIG. 2 is a light transmissive and reflective region of an embodiment of the present invention;
FIG. 3 is a schematic diagram of a light transmissive and reflective region according to an embodiment of the present invention;
FIG. 4 is a front view of a light transmissive and reflective region according to an embodiment of the present invention;
FIG. 5 is a schematic block diagram of an embodiment of the present invention;
in the figure: 1-a projection screen; 11-a light-transmitting and light-reflecting region; 12-light holes; 13-a light hole frame; 14-shading and reflecting parts; 2-courseware computer; 3-projector; 4-electric control holder; 5-a console; 6-a video camera; 7-a signal adder; 8-a rotation angle detector.
Detailed Description
The invention is further illustrated in the following, in conjunction with the accompanying drawings and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. It is needless to say that the person skilled in the art realizes that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive in scope.
Embodiment one:
as shown in fig. 1 and 5, the mobile projection type fine class video line-of-sight guiding system comprises a projection screen 1, a courseware computer 2, a projector 3, an electric control cradle head 4 and a console 5.
The projection screen 1 is arranged opposite to the platform and used for displaying courseware captions; the courseware computer 2 is used for generating courseware subtitles; the projector 3 is installed on the automatically controlled cloud platform 4, automatically controlled cloud platform 4 is as the installation base member of projector 3, makes the projector 3 can be along with automatically controlled cloud platform 4 moves, projector 3 with courseware computer 2 is connected and is located the place ahead of projection screen 1, is located the place ahead upside generally for avoid causing blocking to teacher's sight, projector 3 is by the slope of top downward projection to on the projection screen 1, courseware subtitle that generates on the courseware computer 2 passes through projector 3 projects to on the projection screen 1 show the courseware subtitle on the projection screen 1, the size of projection screen 1 is greater than the size of the area that the courseware subtitle accounts for.
The control console 5 comprises a sight guiding control module in signal connection with the electric control console 4, the electric control console 4 is a digital console, the sight guiding control module controls the electric control console 4 through digital signals, a console control rocker connected with the sight guiding control module is further arranged on the control console 5, and the console control rocker controls the electric control console 4 to move through the sight guiding control module, so that the movement direction and movement speed of the projector 3 are controlled. The cradle head control rocker can control the movement direction and speed of the projector 3 according to the direction and amplitude of the cradle head control rocker, and a worker can flexibly control the movement of the electric control cradle head 4 according to the requirement.
The control console 5 is further provided with a target position shortcut key connected with the sight line guiding control module, the sight line guiding control module can preset target position data of the electric control tripod head, and when the target position shortcut key is pressed down, the sight line guiding control module controls the electric control tripod head 4 to rotate to a corresponding position according to the preset target position data. The target position data may be data of a specific position and a direction, that is, a direction most frequently watched by a teacher, and when the target position shortcut key is pressed, the sight line guiding control module controls the electronic control holder 4 to move to the direction most frequently watched by the teacher according to the preset target position data, and the sight line of the teacher naturally follows; the target position data can also be in a certain movement mode, such as glance movement, attention point transfer movement and the like, the glance movement generally occurs when the students think in the beginning of a lesson, in the lesson and in the middle of a question, and when the lesson is in normal times, a teacher generally communicates with all students with one eye when the lesson begins or ends, and the uniform movement speed is realized by adopting a mode that the eye of the sight smoothly sweeps through all the students; the attention point transferring movement is generally adopted by students to ask questions, and is characterized by higher movement speed. The user can move according to the target position data only by pressing the shortcut key, the control of the cradle head control rocker is not needed, and the control mode is more convenient. The electronic control cradle head 4 has a full-automatic mode, namely, the sight line transfer of a teacher in a course is made into an automatic program, the automatic program can intelligently control the projection direction of the projector 3, the automatic program programming can refer to the regular programming of the sight line transfer of the teacher with a natural lecture, and the time and the direction speed of a transfer medium can have a certain random change range and are not invariable.
The working principle of the embodiment is as follows:
in the course of recording the fine lessons, a teacher stands on the lecture table and gives lessons to a blackboard or an electronic display board on the lecture table, and in the course of teaching the teacher, courseware subtitles generated on the courseware computer 2 are projected onto the projection screen 1 through the projector 3 and are used for providing the courseware subtitles for the teacher; in the teaching process, the control console 5 can control the electric control cradle head 4 to move, so that the movement of the projector 3 is regulated, courseware captions displayed on the projection screen 1 can move to different areas of the projection screen 1, in the courseware captions moving process, the vision of a teacher moves along with the courseware captions, the vision can not be always concentrated at a certain position in the teaching process of the teacher, the vision can naturally move, the displayed video images of the courses are more natural, the courseware captions can not be observed, and the teaching effect is improved. The sight guiding system is mainly used for the situation that teachers need lectures oriented to classmates, and does not influence the back watching and indicating of blackboard and podcast screen contents of the lectures teachers.
Referring to fig. 2 to 4, the projection screen 1 is provided with a light-transmitting and light-reflecting area 11, and the light-transmitting and light-reflecting area 11 is composed of an array of light-transmitting and light-reflecting units.
The light-transmitting and reflecting unit comprises a light-transmitting hole 12, a light-transmitting hole frame 13 is arranged on the periphery of the light-transmitting hole 12, a shading and reflecting part 14 arranged on the light-transmitting hole frame 13 is arranged on the upper part of the light-transmitting hole 12, a reflecting surface inclining downwards is arranged on the outer side of the shading and reflecting part 14, diffuse reflection materials are arranged on the reflecting surface, light from the projector 3 is reflected to the direction of a platform through the reflecting surface, a teaching teacher can see a projection image, and shadows formed by the shading and reflecting part 14 irradiated by the projector 3 completely cover the light-transmitting hole 12; the surfaces of the rest parts except the reflecting surface of the light-transmitting and reflecting unit are all made of light-absorbing materials, and the length and the width of any light-transmitting and reflecting unit are smaller than 1mm. The light emitted by the projector 3 irradiates on the reflecting surface of the shading and reflecting part 14, the light reflected by the reflecting material can be seen by a teaching teacher, the shadow formed by the shading and reflecting part irradiated by the projector 3 completely covers the light-transmitting hole 12, namely, the shadow does not pass through the light-transmitting hole 12, and at the moment, the camera can record a video through the light-transmitting and reflecting area 11 and irradiates the other surface of the projection screen.
The sight line guiding system further comprises a rotation angle detector 8 which is worn on the teaching teacher head and used for measuring the rotation angle of the teacher head, wherein the rotation angle detector 8 comprises a gyroscope, an angle detection circuit and a wireless transmission circuit, and the angle detection circuit is used for detecting rotation angle data signals of the gyroscope and transmitting the rotation angle data signals to the wireless transmission circuit.
The console 5 further comprises a wireless receiving circuit corresponding to the wireless transmitting circuit, the wireless receiving circuit receives the rotating angle data signal transmitted by the wireless transmitting circuit and transmits the rotating angle data signal to the sight line guiding control module, and the sight line guiding control module drives the electric control holder 4 to move, so that the movement direction and the movement speed of the projector 3 are controlled.
The control console 5 is further provided with an active and passive switching key for switching between an active guiding mode and a passive tracking mode, and when the active and passive switching key is pressed, the sight line guiding control module can switch between the active guiding mode and the passive tracking mode.
When the sight line guiding control module is in the active guiding mode, the sight line guiding control module receives control signals of the cradle head control rocker and the target position shortcut key; the method comprises the following steps: at the moment, a background person can control the sight guiding control module by controlling the cradle head control rocker and the target position shortcut key, so that the electric control cradle head 4 and the projector 3 arranged on the electric control cradle head 4 move, courseware captions move on the projection screen 1, and the sight is transferred along with the movement of the courseware captions in the process of teaching by a teacher;
when the sight line guiding control mode is in the passive following mode, the sight line guiding control module receives a rotation angle data signal received by the wireless receiving circuit; the method comprises the following steps: the head rotates in the teaching process of the teacher, the angle detection circuit detects a rotation angle data signal and transmits the signal to the wireless transmitting circuit, the wireless transmitting circuit transmits the rotation angle data signal to the wireless receiving circuit and transmits the rotation angle data signal to the sight guiding control module, so that the electric control holder 4 and the projector 3 arranged on the electric control holder 4 move, the courseware captions move on the projection screen 1, and the courseware captions can correspondingly shift along with the rotation angle of the head of the teacher.
The sight guiding control module can also have the calibration function of the head rotation angle detector 8, before the teaching teacher plays a lesson, the teaching teacher carries out angle calibration towards the center and four corners positions of the screen respectively, and the sight direction of the teaching teacher and the courseware subtitle projection direction can be more accurate when the courseware subtitle display position is passively tracked.
The sight line guiding system also comprises a signal adder 7 connected with the courseware computer 2, the console 5 and the projector 3; the console 5 further comprises a media playing module, media signals played by the media playing module and courseware subtitles output by the courseware computer 2 are respectively transmitted to the signal adder 7, and the signal adder 7 adds the media signals on the media playing module and the courseware subtitles of the courseware computer 2 and then transmits the media signals and the courseware subtitles to the projector 3. The media playing module can play student images which accord with the teaching content of a teacher, the university courses play various images of the college students, the primary school courses play images of the primary school students, and the images of different expressions of the students such as earnestly listening, discussing each other, jumping to the desire and the like can be respectively played according to the teaching content of the classroom, so that the teaching state of the teacher is better helped. When the courseware subtitle exists, the background image of the courseware subtitle can be used.
The projection screen 1 is provided as a circular arc type screen, and the projector 3 is installed at a position above the center of the circular arc type screen.
Embodiment two:
in this embodiment, the camera 6 is additionally provided on the basis of the first embodiment, the camera 6 is disposed in the darkroom, the light-transmitting and light-reflecting area 11 of the projection screen 1 is a surface of the darkroom, at this time, the camera 6 can record video through the light-transmitting and light-reflecting area 11, when the downward projection angle of the projector 3 is 30 °, the light transmittance of the light in the platform direction reaching the camera 3 through the light-transmitting and light-reflecting area 11 can be more than 40%, the illuminance is reduced by approximately equal to the level of one-stage aperture more than the photographing reduction, so that the problem of reduced photographing quality will not occur as long as good illumination is maintained. From the teacher direction, the courseware subtitles reflected by the array area of the light holes 12 are not consistent with the courseware subtitles reflected by other areas, which affects a certain watching effect, but the purpose of watching the courseware subtitle content can be achieved.
The foregoing has shown and described the basic principles, main features and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The mobile projection type fine class video sight guiding system is characterized by comprising a projection screen, a courseware computer, a projector, an electric control cradle head and a control console;
the projection screen is arranged opposite to the platform and used for displaying courseware captions;
the courseware computer is used for generating courseware subtitles;
the projector is arranged on the electric control holder, is connected with the courseware computer and is positioned in front of the projection screen, courseware subtitles generated on the courseware computer are projected onto the projection screen through the projector, the courseware subtitles are displayed on the projection screen, and the size of the projection screen is larger than the size of the area occupied by the courseware subtitles displayed on the projection screen;
the control console comprises a sight line guiding control module which is in signal connection with the electric control console, a console control rocker which is connected with the sight line guiding control module is further arranged on the control console, and the console control rocker controls the electric control console to move through the sight line guiding control module so as to control the movement direction and the movement speed of the projector;
the control console is also provided with a target position shortcut key connected with the sight line guiding control module, the sight line guiding control module can preset target position data of the electric control cloud deck, and when the target position shortcut key is pressed down, the sight line guiding control module controls the electric control cloud deck to rotate to a corresponding position according to the preset target position data;
the projection screen is provided with a light-transmitting and light-reflecting area, and the light-transmitting and light-reflecting area consists of a light-transmitting and light-reflecting unit array;
the light-transmitting and reflecting unit comprises a light hole, a light hole frame is arranged on the periphery of the light hole, a shading and reflecting part arranged on the light hole frame is arranged on the upper portion of the light hole, a reflecting surface inclining downwards is arranged on the outer side of the shading and reflecting part, diffuse reflection materials are arranged on the reflecting surface, light from the projector is reflected to the direction of a platform through the reflecting surface, a teacher can see a projection image, and shadows formed by the shading and reflecting part irradiated by the projector completely cover the light hole; the surfaces of the rest parts except the reflecting surface of the light-transmitting and reflecting unit are all made of light-absorbing materials, and the length and the width of any light-transmitting and reflecting unit are smaller than 1mm.
2. The mobile projection type video-in-lesson gaze guidance system of claim 1, further comprising: the sight line guiding system also comprises a signal adder which is respectively connected with the courseware computer, the console and the projector;
the control console also comprises a media playing module, wherein media signals played by the media playing module and courseware subtitles output by the courseware computer are respectively transmitted to the signal superposition device, and the signal superposition device is used for superposing the media signals on the media playing module and the courseware subtitles of the courseware computer and then transmitting the superposed media signals and the courseware subtitles to the projector.
3. The mobile projection type video-in-lesson gaze guidance system of claim 1, further comprising: the sight line guiding system further comprises a rotation angle detector for measuring the rotation angle of the teacher head, wherein the rotation angle detector comprises a gyroscope, an angle detection circuit and a wireless transmitting circuit, and the angle detection circuit is used for detecting a rotation angle data signal of the gyroscope and transmitting the rotation angle data signal to the wireless transmitting circuit;
the control console further comprises a wireless receiving circuit corresponding to the wireless transmitting circuit, the wireless receiving circuit receives the rotating angle data signals transmitted by the wireless transmitting circuit and transmits the rotating angle data signals to the sight line guiding control module, and the sight line guiding control module drives the electric control cradle head to move so as to control the movement direction and movement speed of the projector;
the control console is also provided with an active and passive switching key for switching an active guiding mode and a passive tracking mode, when the active and passive switching key is pressed, the sight line guiding control module can switch between the active guiding mode and the passive tracking mode, and when the sight line guiding control module is in the active guiding mode, the sight line guiding control module receives control signals of the pan-tilt control rocker and the target position shortcut key; when the sight line guiding control module is in the passive tracking mode, the sight line guiding control module receives the rotation angle data signal received by the wireless receiving circuit.
4. A mobile projection type video-in-lesson line-of-sight guidance system as claimed in any one of claims 1 to 3, wherein: the projection screen is provided as an arc-shaped screen, and the projector is installed at a position above the center of the arc-shaped screen.
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| CN202111156544.3A CN113888907B (en) | 2021-09-30 | 2021-09-30 | Mobile projection type fine class video line-of-sight guiding system |
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| CN106292154B (en) * | 2016-09-05 | 2018-09-18 | 南京福图信息科技有限公司 | A kind of positive throwing optical microstructures curtain of applied film solar cell |
| CN111273512A (en) * | 2018-12-04 | 2020-06-12 | 深圳光峰科技股份有限公司 | Projection screen and projection system |
| CN109634045A (en) * | 2018-12-10 | 2019-04-16 | 江阴通利光电科技有限公司 | Anti-light curtain of a kind of change spacing and preparation method thereof |
| CN213302740U (en) * | 2020-10-24 | 2021-05-28 | 芜湖职业技术学院 | Intelligent photography lamp box |
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| CN110383214A (en) * | 2017-03-09 | 2019-10-25 | 索尼公司 | Information processing unit, information processing method and recording medium |
| CN111739359A (en) * | 2020-06-30 | 2020-10-02 | 上海乂学教育科技有限公司 | Augmented reality courseware generation system |
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