CN102945637A - Augmented reality based embedded teaching model and method - Google Patents
Augmented reality based embedded teaching model and method Download PDFInfo
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- CN102945637A CN102945637A CN2012104997142A CN201210499714A CN102945637A CN 102945637 A CN102945637 A CN 102945637A CN 2012104997142 A CN2012104997142 A CN 2012104997142A CN 201210499714 A CN201210499714 A CN 201210499714A CN 102945637 A CN102945637 A CN 102945637A
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Abstract
The invention discloses an augmented reality based embedded teaching model and method. The model comprises an embedded development board, a mark card, a video camera and a projector; and the method comprises the following steps of: shooting a true scene by using the video camera, and holding a reference object with a marking function by a teacher; then, overlying a virtual model relevant with teaching content on the reference object by using an augmented reality means; and carrying out corresponding operations such as amplification, contraction and addition of literal statement on the model to finish vivid and natural teaching. By using the scheme, not only can the virtual model be conveniently replaced, but also the playing time and speed of a dynamic model can be controlled, and various teaching requirements can be met. Meanwhile, the scheme can be popularized to scenes such as commodity issuance and simulated training so as to achieve wide application space and high popularization value.
Description
Technical field
The present invention relates to a kind of embedded teaching model based on augmented reality, and utilize this model auxiliary method of imparting knowledge to students, belong to the augmented reality field.
Background technology
Along with the development of computer graphic image technology and space orientation technique, people are applied in every field with augmented reality more and more.Aspect teaching, than traditional approach, can adopt augmented reality to make the content of courses truer lively, improve teaching efficiency.At planographic product stacks three dimensional virtual models and animation, present by display device again, attract the student to understand the content of courses in depth with the Teaching Experience of uniqueness.
Represent certain virtual scene in the classroom, so that dull classroom becomes rich and varied originally, with those complexity and abstract concept describes in vivid mode, thereby the enthusiasm of mobilizing students fully, effectively improve the interaction between the teachers and students, and be conducive to the student to assurance and the absorption of knowledge, and strengthen the classroom learning effect, improve learning efficiency.
But present virtual scene should use and not be very convenient, flexible, the Teaching Experience poor effect.
Summary of the invention
Goal of the invention: for problems of the prior art, the invention provides a kind of embedded teaching model and method thereof based on augmented reality.
The invention provides a kind of solution of flexibly aided education, take the displaying scene that does not contain showpiece by video camera, wherein by the hand-held a kind of object of reference with calibrating function of teacher, then utilize the augmented reality means, at the object of reference stack dummy model relevant with the content of courses, add corresponding animation, thereby finish lively, natural teaching.
The solution of the present invention not only can be changed dummy model easily, and can control reproduction time and the speed of animation, satisfies all kinds of teaching demands.This scheme can be generalized in the scenes such as commodity issue, simulated training simultaneously, and space and promotional value are widely used.
The present invention is directed to embedded platform and done a large amount of Optimization Works, guaranteed real-time and the fluency of system's operation, strengthened Teaching Experience.
Technical scheme: a kind of embedded teaching model based on augmented reality comprises embedded board, badge card, video camera and projector; Described embedded board is connected with projector with video camera respectively; Virtual three-dimensional model is superimposed upon on the described badge card; Described video camera is used for taking the real scene that comprises badge card, and video is passed to embedded board; After described embedded board received the video that video camera transmits, the position of identification marking card utilized augmented reality, virtual three-dimensional model is superposeed, and resultant image is passed to projector, and projector outputs to resultant image on the projection screen and shows.
Described embedded board, be one based on the embedded board of X86-based, the wherein processor of an embedded X86-based and a FPGA, both link to each other by the PCI-E bus; Embedded board is connected with video camera by the AV interface, is connected with projector by the VGA interface; Between AV interface and the FPGA, modulus conversion chip and video decoding chip are arranged, embedded board receives the analog video signal that video camera is sent by the AV interface, and be converted to digital video signal and pass to FPGA, after doing white balance, filtering noise reduction process by FPGA, pass to again processor and process; The position of processor identification marking card and coordinate angle are superimposed upon the badge card position with virtual three-dimensional model, the functions such as the translation that supplies a model, rotation, scaling, replacing, animation control, and export in real time composograph.
Described badge card is a kind of object that plays the mark effect, is the pictorial symbolization card that a pattern that is made of black-and-white two color is drawn; Described embedded board is superimposed upon dummy model on the badge card by position and the angle of calibration marks card.The teacher is by hand-held badge card, or badge card is fixed on the tripod, taken by video camera, and by tutoring system, and the virtual three-dimensional model of teaching usefulness is superimposed upon on the badge card.Except being used for teaching, also may be used on other scenes, such as product introduction etc.
A kind of method of the embedded teaching model based on augmented reality comprises the steps:
At first, badge card is fixing in place, and the relevant parameter of initialization video camera is in order to obtain correct photographed frame image from video camera;
Then, after obtaining two field picture by video camera, two field picture is done white balance, filtering noise reduction process, from two field picture, seek the in advance badge card position of regulation, and badge card is with respect to the angle of video camera shooting;
After finding the badge card position, calculate video camera with respect to the projective transformation matrix of the sign that detects, the coordinate system of video camera camera site is converted to the coordinate system of badge card position, thereby at the badge card that the detects virtual three-dimensional model that superposes;
At last, the virtual three-dimensional model that will superpose supplies a model after translation, rotation, scaling, replacing, the animation control, by the virtual three-dimensional model after the projector output stack.
The present invention has brought into play the characteristic of embedded board to greatest extent, in Windows Embedded Standard 7 systems, adopt ARToolkit augmented reality storehouse, the realization three-dimensional model that computer is the virtual function in the real world picture that is added to, namely in certain distance, take the real world picture, and the badge card in the identification picture, thereby virtual three-dimensional model is added on the position shown in the badge card, and last in real time output is through the synthetic image of stack.The three-dimensional model that superposes is to move along with the movement of badge card, seems to just look like to stick on badge card equally, and the variation of badge card angle also can change the angle of three-dimensional model.
The present invention adopts technique scheme, has following beneficial effect: the physical size of embedded board is very little, has good portability, and is guaranteeing to have lower power consumption and cost under the prerequisite of superperformance, and real-time preferably.Model realization equipment is simple, general, can be cross-platform, and portability and secondary development are all good.Except the subsidiary function that provides powerful of imparting knowledge to students, the present invention can also expand to other application scenarioss, such as product introduction, conference presentation etc., uses very extensive.
Description of drawings
Fig. 1 is the schematic diagram of the embodiment of the invention;
Fig. 2 is the Intel EPCM-505C embedded board structural drawing of the embodiment of the invention;
Fig. 3 is the workflow diagram of the embodiment of the invention.
Embodiment
Below in conjunction with specific embodiment, further illustrate the present invention, should understand these embodiment only is used for explanation the present invention and is not used in and limits the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
As shown in Figure 1, based on the embedded teaching model of augmented reality, comprise embedded board 3, badge card 1, video camera 2 and projector 4.
As shown in Figure 2, embedded board 3 is Intel EPCM-505C embedded boards, and left side, embedded board 3 cores is Intel Atom processor, and model is E645C, frequency 1.0GHz, core two-wire journey.The right side, core is the FPGA of an Altera Arria II, and its concrete model is EP2AGXE6XX.This FPGA links to each other by the PCI-E bus with Intel Atom processor, thereby communicates.Embedded board 3 peripheries are some external interfaces, such as USB interface, VGA interface, AV interface etc.
Embedded board 3 is connected with video camera 2 by the AV interface, is connected with projector 4 by the VGA interface; Between AV interface and the FPGA, modulus conversion chip and video decoding chip are arranged, embedded board 3 receives the analog video signal that video camera 2 is sent by the AV interface, and be converted to digital video signal and pass to FPGA, after doing white balance, brightness adjustment and filtering noise reduction process by FPGA, pass to again processor and process; The position of processor identification marking card 1 and coordinate angle are superimposed upon badge card 1 position with virtual three-dimensional model, the functions such as the translation that supplies a model, rotation, scaling, replacing, animation control, and export in real time composograph to projector 4.Projector 4 outputs to resultant image on the projection screen 5 and shows.
Wherein badge card 1 is a kind of object that plays the mark effect, is the pictorial symbolization card that a pattern that is made of black-and-white two color is drawn; Embedded board 3 is superimposed upon dummy model on the badge card 1 by position and the angle of calibration marks card 1.The teacher is by hand-held badge card 1, or badge card 1 is fixed on the tripod, taken by video camera 2, and by tutoring system, and the virtual three-dimensional model of teaching usefulness is superimposed upon on the badge card 1.Except being used for teaching, also may be used on other scenes, such as product introduction etc.
As shown in Figure 3, the method based on the embedded teaching model of augmented reality comprises the steps:
At first, badge card 1 is fixed in place, the relevant parameter of initialization video camera 2 is in order to obtain correct photographed frame image from video camera 2;
Then, after obtaining two field picture by video camera 2, two field picture is done white balance, filtering noise reduction process, from two field picture, seek in advance badge card 1 position of regulation, and badge card 1 is with respect to the angle of video camera 2 shootings;
After finding badge card 1 position, calculating video camera 2 is with respect to the projective transformation matrix of badge card 1 sign that detects, the coordinate system of video camera 2 camera sites is converted to the coordinate system of badge card 1 position, thereby at the badge card 1 that the detects virtual three-dimensional model that superposes;
At last, the virtual three-dimensional model that will superpose supplies a model after translation, rotation, scaling, replacing, the animation control, by the virtual three-dimensional model after the projector 4 output stacks.Until two field picture has obtained, close video camera 2, discharge the internal memory of embedded board 3, power cut-off.
Relate in the course of the work two topmost coordinate systems.One is video camera 2 coordinate systems, is the captured video of video camera 2, the coordinate system take video camera 2 as reference frame; Another is badge card 1 coordinate system, is as the coordinate system with reference to system with badge card 1.Final three-dimensional model is need to be superimposed upon above the badge card 1, and model can move along with the movement of badge card 1, so the coordinate conversion matrix that calculates is the transition matrix that video camera 2 coordinate systems is converted to badge card 1 coordinate system.
Claims (4)
1. the embedded teaching model based on augmented reality is characterized in that: comprise embedded board, badge card, video camera and projector; Described embedded board is connected with projector with video camera respectively; Virtual three-dimensional model is superimposed upon on the described badge card; Described video camera is used for taking the real scene that comprises badge card, and video is passed to embedded board; After described embedded board received the video that video camera transmits, the position of identification marking card utilized augmented reality, virtual three-dimensional model is superposeed, and resultant image is passed to projector, and projector outputs to resultant image on the projection screen and shows.
2. the embedded teaching model based on augmented reality as claimed in claim 1, it is characterized in that: described embedded board, be one based on the embedded board of X86-based, the wherein processor of an embedded X86-based and a FPGA, both link to each other by the PCI-E bus; Embedded board is connected with video camera by the AV interface, is connected with projector by the VGA interface; Between AV interface and the FPGA, modulus conversion chip and video decoding chip are arranged, embedded board receives the analog video signal that video camera is sent by the AV interface, and be converted to digital video signal and pass to FPGA, after doing white balance, filtering noise reduction process by FPGA, pass to again processor and process; The position of processor identification marking card and coordinate angle are superimposed upon the badge card position with virtual three-dimensional model, the translation that supplies a model, rotation, scaling, replacing, animation control function, and export in real time composograph.
3. the embedded teaching model based on augmented reality as claimed in claim 1, it is characterized in that: described badge card is a kind of object that plays the mark effect, is the pictorial symbolization card that a pattern that is made of black-and-white two color is drawn; Described embedded board is superimposed upon dummy model on the badge card by position and the angle of calibration marks card.
4. the method based on the embedded teaching model of augmented reality is characterized in that, comprises the steps:
At first, badge card is fixing in place, and the relevant parameter of initialization video camera is in order to obtain correct photographed frame image from video camera;
Then, after obtaining two field picture by video camera, two field picture is done white balance, filtering noise reduction process, from two field picture, seek the in advance badge card position of regulation, and badge card is with respect to the angle of video camera shooting;
After finding the badge card position, calculate video camera with respect to the projective transformation matrix of the sign that detects, the coordinate system of video camera camera site is converted to the coordinate system of badge card position, thereby at the badge card that the detects virtual three-dimensional model that superposes;
At last, the virtual three-dimensional model that will superpose supplies a model after translation, rotation, scaling, replacing, the animation control, by the virtual three-dimensional model after the projector output stack.
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Application publication date: 20130227 |