CN108932879A - A kind of teaching display systems based on MR - Google Patents
A kind of teaching display systems based on MR Download PDFInfo
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- CN108932879A CN108932879A CN201810964714.2A CN201810964714A CN108932879A CN 108932879 A CN108932879 A CN 108932879A CN 201810964714 A CN201810964714 A CN 201810964714A CN 108932879 A CN108932879 A CN 108932879A
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- 230000000007 visual effect Effects 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 18
- 238000006073 displacement reaction Methods 0.000 claims description 12
- -1 polytetrafluoroethylene ethylene Polymers 0.000 claims description 8
- 230000001186 cumulative effect Effects 0.000 claims description 4
- 230000005389 magnetism Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 210000003128 head Anatomy 0.000 description 2
- 210000001747 pupil Anatomy 0.000 description 2
- 230000019771 cognition Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical compound FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0176—Head mounted characterised by mechanical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0138—Head-up displays characterised by optical features comprising image capture systems, e.g. camera
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Business, Economics & Management (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- Theoretical Computer Science (AREA)
Abstract
The invention discloses a kind of teaching display systems based on MR, organism is arranged in helmet front, body front is provided with wide-angle camera and laser range finder, the helmet back side passes through elastic hinged shaft and is flexibly connected neck brace, neck brace end is provided with soft layer, and the soft layer of elastic hinged shaft compressing neck brace end abuts the posterior neck of user；During the present invention is implemented, the visual field can be changed with user location and viewing angle variation；In the equipment course of work, wide-angle camera acquire in real time really be place figure, figure (Real-image) shape, which is acquired, according to camera matches default place, according to default site parameter with determining image midfield boundary parameter and reference point coordinate, according to image midfield boundary parameter and reference point coordinate, in conjunction with picture material calculating observation angle, user location is substituted into the position in virtual scene, calculate the virtual image that should be watched in user perspective, the virtual image that should be watched in user perspective is superimposed into actual place, the viewing of MR images for user is formed.
Description
Technical field
The present invention relates to virtual reality teaching fields, and in particular to a kind of teaching display systems based on MR.
Background technique
In traditional teaching process of physical education, it is limited by the conditionalities such as equipment, place, funds, it is many large-scale or have one
The PE activities for determining risk are difficult to carry out.MR technology analog scene, can allow the background for only depending on existing place, and
Obtain the cognition as true sports.It can be said that MR technology reduces experiment behaviour under the premise of guaranteeing teaching efficiency
Make possible difficult and danger, and considerably reduce experimental cost, but in existing MR technology, needs user in spy
Determine place to watch at a particular angle, it has not been convenient to which user uses, and is also not easy to observe whole scene.
A kind of VR helmet equipment visual field angular measurement side is disclosed in the patent specification of Patent No. CN106124169A
Method, it is characterised in that measurement method uses aperture diaphragm (4) imitation pupil, and the centre of the aperture diaphragm (4) has light hole；
The fixed VR helmet, aperture diaphragm (4) setting is parallel with lens (3) of the VR helmet, and light hole center is located at lens (3) optical axis
On, aperture diaphragm (4) is distance of exit pupil at a distance from lens (3)；Fixed dress is set at a certain distance from aperture diaphragm (4)
It sets, the first source of parallel light (6) and the second source of parallel light (7) is set on fixed device；First source of parallel light (6) center and lens
(3) light beam of key light overlapping of axles, the first source of parallel light (6) is projected in the screen (2) of the VR helmet by aperture diaphragm (4)
The heart；The angle for adjusting the second source of parallel light (7), by its light beam by being refracted to screen by lens (3) after aperture diaphragm (4)
(2) edge；The angle ω for measuring the first source of parallel light (6) Yu the second source of parallel light (7), obtaining field angle FOV is 2 ω.
But the above method can only calculate helmet equipment field angle, it can not be in the case where user changes helmet viewing angle
Change user's field-of-view angle and direction.
Therefore a kind of presentation device that can impart knowledge to students with the MR that user location and viewing angle variation change the visual field is needed.
Summary of the invention
It is an object of the invention to overcome the above-mentioned problems in the prior art, a kind of teaching displaying based on MR is provided
System can change the visual field with user location and viewing angle variation.
To realize above-mentioned technical purpose and the technique effect, the present invention is achieved through the following technical solutions:
Organism is arranged in a kind of teaching presentation device based on MR, including the helmet, helmet front, and body front is provided with extensively
Angle camera and laser range finder, the helmet back side pass through elastic hinged shaft and are flexibly connected neck brace, and neck brace end is provided with soft layer, bullet
Property hinged shaft compressing neck brace end soft layer abut the posterior neck of user, body front is additionally provided with lodar, in body
Portion is additionally provided with vertical three-dimensional accelerometer.
Further, the helmet includes nonmagnetic shell, and case top and bottom are respectively fixed with frictional layer and gather
Tetrafluoroethene layer, the driving magnetic patch above frictional layer attracts each other with the driven magnetic patch magnetism below polytetrafluoroethylene ethylene layer, driven
Magnetic patch is flexibly connected by drive rod with inner casing, and the position of adjustment driving magnetic patch, driven magnetic patch is since magnetic attraction acts on, position
Change therewith, the angle of drive rod also changes correspondingly, longitudinal length variation compressing inner casing lifting, can be according to the needs of users
Adjust inner casing.
Further, the driving magnetic patch and driven magnetic patch are provided with and match respectively with frictional layer and polytetrafluoroethylene ethylene layer
Cambered surface.
A kind of teaching presentation device positioning display method based on MR, includes the following steps,
Step S1: figure (Real-image) shape is acquired according to camera and matches default place；
Step S2: according to default site parameter with determining image midfield boundary parameter and reference point coordinate；
Step S3: according to image midfield boundary parameter and reference point coordinate, in conjunction with picture material calculating observation angle (θ1
To θ5)；
Step S4: according to view angle computed user locations；
Step S5: user location is substituted into the position in virtual scene, calculates the virtual image that should be watched in user perspective；
Step S6: the virtual image that should be watched in user perspective is superimposed into actual place；
Step S7: the viewing of MR images for user is formed
Further, 21 visual field of wide-angle camera is obstructed in user's watching process, then executes following steps,
Firstly, according to the displacement of accelerometer cumulative calculation body and rotational angle；
Then, using image viewing be obstructed grid azimuth as starting point calculate observation be obstructed during body real-time displacement and turn
Dynamic angle；
Finally, the live picture before being obstructed according to image viewing loads virtual image.
Further, in the step S4, following steps are specifically included,
Step S4.1: Length x Width d is extracted from place boundary parameter and reference point coordinate；
Step S4.1: according to length angular relationship:
It can be obtained by formula 1 and formula 2,
Step S4.3: real-time displacement, θ are solved according to x and y value1To θ3For view angle.
Further, when laser range finder can not work normally because haze etc. blocks, then lodar progress is enabled
Ranging.
Income effect of the invention is:
1, the helmet is worn on the head by user, eyes face body display portion, and elastic hinged shaft oppresses the soft of neck brace end
Layer abuts the posterior neck of user, plays fixed effect, the position of adjustment driving magnetic patch, driven magnetic patch since magnetic attraction acts on,
Position changes therewith, and the angle of drive rod also changes correspondingly, longitudinal length variation compressing inner casing lifting, can be according to user's
It needs to adjust inner casing.
2, the visual field can be changed with user location and viewing angle variation；In the equipment course of work, wide-angle camera
Acquisition in real time is really the figure in place, acquires figure (Real-image) shape according to camera and matches default place, according to default field
Ground parameter with determining image midfield boundary parameter and reference point coordinate, according to image midfield boundary parameter and reference point are sat
Mark, in conjunction with picture material calculating observation angle (θ1To θ5), user location is substituted into the position in virtual scene, calculates user perspective
The virtual image that should be watched in user perspective is superimposed into actual place by the interior virtual image that should be watched, formed MR image for
Family viewing.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will be described below to embodiment required
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the schematic diagram of the teaching presentation device of the present invention in MR；
Fig. 2 is the schematic diagram of the present invention under the teaching presentation device abutting stationary state of MR；
Fig. 3 is the structural schematic diagram of the helmet of the present invention and inner casing connection status；
Fig. 4 is the structural schematic diagram after inner casing of the present invention decline；
Fig. 5 is the schematic diagram of the teaching presentation device positioning display method of the present invention in MR；
Fig. 6 is the schematic diagram of accelerometer auxiliary positioning of the present invention；
Fig. 7 is the flow chart in step S4 of the present invention according to view angle computed user locations.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
As shown in figs. 1-7, the present invention is a kind of teaching presentation device based on MR, including the helmet 1, helmet front are provided with
Body 2,1 front of body are provided with wide-angle camera 21 and laser range finder 22, and 1 back side of the helmet passes through elastic 5 activity of hinged shaft even
Neck brace 6 is connect, 6 end of neck brace is provided with soft layer 7, and the soft layer 7 that elastic hinged shaft 5 oppresses 6 end of neck brace abuts the posterior neck of user,
1 front of body is additionally provided with lodar 23, and vertical three-dimensional accelerometer 24 is additionally provided with inside body 1.
One preference of present embodiment is that the helmet 1 includes nonmagnetic shell 11,11 top and bottom of shell
It is respectively fixed with frictional layer 12 and polytetrafluoroethylene ethylene layer 14, under the driving magnetic patch 13 and polytetrafluoroethylene ethylene layer 14 above frictional layer 12
15 magnetism of driven magnetic patch of side attracts each other, and driven magnetic patch 15 is flexibly connected by drive rod 16 with inner casing 4, adjustment driving magnetic patch
13 position, driven magnetic patch 15 is since magnetic attraction acts on, and position changes therewith, and the angle of drive rod 16 also changes correspondingly, and indulges
Change compressing inner casing 4 to length to go up and down, inner casing 4 can be adjusted according to the needs of users.
One preference of present embodiment is, the driving magnetic patch 13 and driven magnetic patch 15 be provided with respectively with friction
Layer 12 and the matched cambered surface of polytetrafluoroethylene ethylene layer 14.
A kind of teaching presentation device positioning display method based on MR, includes the following steps,
Step S1: figure (Real-image) shape is acquired according to camera and matches default place；
Step S2: according to default site parameter with determining image midfield boundary parameter and reference point coordinate；
Step S3: according to image midfield boundary parameter and reference point coordinate, in conjunction with picture material calculating observation angle (θ1
To θ5)；
Step S4: according to view angle computed user locations；
Step S5: user location is substituted into the position in virtual scene, calculates the virtual image that should be watched in user perspective；
Step S6: the virtual image that should be watched in user perspective is superimposed into actual place；
Step S7: the viewing of MR images for user is formed
One preference of present embodiment is that 21 visual field of wide-angle camera is obstructed in user's watching process, then execute with
Lower step,
Firstly, according to the displacement of accelerometer cumulative calculation body and rotational angle；
Then, using image viewing be obstructed grid azimuth as starting point calculate observation be obstructed during body real-time displacement and turn
Dynamic angle；
Finally, the live picture before being obstructed according to image viewing loads virtual image.
One preference of present embodiment is in the step S4, to specifically include following steps,
Step S4.1: Length x Width d is extracted from place boundary parameter and reference point coordinate；
Step S4.1: according to length angular relationship:
It can be obtained by formula 1 and formula 2,
Step S4.3: real-time displacement, θ are solved according to x and y value1To θ3For view angle.
One preference of present embodiment is, when laser range finder 22 can not work normally because haze etc. blocks, then opens
Ranging is carried out with lodar 23.
One concrete application of the present embodiment are as follows:
It is as shown in Figs 1-4:
The helmet 1 is worn on the head by user, 1 display portion of eyes face body, and elastic hinged shaft 5 oppresses the soft of 6 end of neck brace
Matter layer 7 abuts the posterior neck of user, plays fixed effect；
The position of adjustment driving magnetic patch 13, driven magnetic patch 15 is since magnetic attraction acts on, and position changes therewith, drive rod 16
Angle also change correspondingly, longitudinal length variation compressing inner casing 4 go up and down, inner casing 4 can be adjusted according to the needs of users.
As illustrated in figs. 5-7:
In the equipment course of work, the acquisition in real time of wide-angle camera 21 is really the figure in place, is acquired and is schemed according to camera
(Real-image) shape matches default place, and according to default site parameter, boundary parameter and reference point are sat with determining image midfield
It marks, according to image midfield boundary parameter and reference point coordinate, in conjunction with picture material calculating observation angle (θ1To θ5)；
According to view angle computed user locations, width d, root are extracted first from place boundary parameter and reference point coordinate
It can be obtained according to the angle and width d of observation,
Above-mentioned equation group is solved, can be obtained
Real-time displacement, θ are finally solved according to x and y value1To θ3For view angle.
User location is substituted into the position in virtual scene, the virtual image that should be watched in user perspective is calculated, by user
The virtual image that should be watched in visual angle is superimposed into actual place, forms the viewing of MR images for user.
If 21 visual field of wide-angle camera is obstructed in user's watching process, according to the displacement of accelerometer cumulative calculation body and
Rotational angle, then using image viewing be obstructed grid azimuth as starting point calculate observation be obstructed during body real-time displacement and turn
Dynamic angle, the live picture before being finally obstructed according to image viewing load virtual image, the method meter added up using accelerometer
Coordinate is calculated, although such method precision is lower, can still play the role of auxiliary.
In aforesaid operations, compare traditional equipment, can change the visual field with user location and viewing angle variation.
In the description of this specification, the descriptions such as reference term " one embodiment ", " example ", " specific example " mean to tie
Specific features, structure, the material for closing embodiment or example description live feature and are contained at least one embodiment of the present invention
Or in example.In the present specification, schematic expression of the above terms may not refer to the same embodiment or example.And
And particular features, structures, materials, or characteristics described can be in any one or more of the embodiments or examples with suitable
Mode combine.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment
All details are described, are not limited the invention to the specific embodiments described.Obviously, according to the content of this specification,
It can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to better explain the present invention
Principle and practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention is only
It is limited by claims and its full scope and equivalent.
Claims (7)
1. a kind of teaching presentation device based on MR, it is characterised in that: including the helmet (1), organism (2) are arranged in helmet front,
Body (1) front is provided with wide-angle camera (21) and laser range finder (22), and it is living that the helmet (1) back side passes through elastic hinged shaft (5)
Dynamic connection neck brace (6), neck brace (6) end are provided with soft layer (7), the soft layer of elastic hinged shaft (5) compressing neck brace (6) end
(7) posterior neck of user is abutted；
Body (1) front is additionally provided with lodar (23), is additionally provided with vertical three-dimensional inside the body (1) and is added
Speedometer (24).
2. a kind of teaching presentation device based on MR according to claim 1, it is characterised in that: the helmet (1) includes
Nonmagnetic shell (11), shell (11) top and bottom are respectively fixed with frictional layer (12) and polytetrafluoroethylene ethylene layer (14), rub
The driving magnetic patch (13) above layer (12) is wiped to attract each other with driven magnetic patch (15) magnetism below polytetrafluoroethylene ethylene layer (14), from
Dynamic magnetic patch (15) are flexibly connected by drive rod (16) with inner casing (4), and the helmet (1) bottom also passes through telescopic rod (3) connection inner casing
(4)。
3. a kind of teaching presentation device based on MR according to claim 1, it is characterised in that: the driving magnetic patch (13)
With driven magnetic patch (15) be provided with respectively with frictional layer (12) and polytetrafluoroethylene ethylene layer (14) matched cambered surface.
4. a kind of teaching presentation device positioning display method based on MR according to claim 1, it is characterised in that: including
Following steps,
Step S1: figure (Real-image) shape is acquired according to camera and matches default place；
Step S2: according to default site parameter with determining image midfield boundary parameter and reference point coordinate；
Step S3: according to image midfield boundary parameter and reference point coordinate, in conjunction with picture material calculating observation angle (θ1Extremely
θ5)；
Step S4: according to view angle computed user locations；
Step S5: user location is substituted into the position in virtual scene, calculates the virtual image that should be watched in user perspective；
Step S6: the virtual image that should be watched in user perspective is superimposed into actual place；
Step S7: the viewing of MR images for user is formed.
5. a kind of teaching presentation device positioning display method based on MR according to claim 4, it is characterised in that: user
Wide-angle camera (21) visual field is obstructed in watching process, then executes following steps,
Firstly, according to the displacement of accelerometer cumulative calculation body and rotational angle；
Then, using image viewing be obstructed grid azimuth as starting point calculate observation be obstructed during body real-time displacement and angle of rotation
Degree；
Finally, the live picture before being obstructed according to image viewing loads virtual image.
6. a kind of teaching presentation device positioning display method based on MR according to claim 4, it is characterised in that: described
In step S4, following steps are specifically included,
Step S4.1: Length x Width d is extracted from place boundary parameter and reference point coordinate；
Step S4.1: according to length angular relationship:
It can be obtained by formula 1 and formula 2,
Step S4.3: real-time displacement, θ are solved according to x and y value1To θ3For view angle.
7. a kind of teaching presentation device positioning display method based on MR according to claim 4, it is characterised in that: when sharp
Optar (22) can not work normally because haze etc. blocks, then enables lodar (23) and carry out ranging.
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| CN201810964714.2A CN108932879A (en) | 2018-08-23 | 2018-08-23 | A kind of teaching display systems based on MR |
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Application publication date: 20181204 |