CN108632591A - A kind of blackboard information regeneration share system - Google Patents
A kind of blackboard information regeneration share system Download PDFInfo
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- CN108632591A CN108632591A CN201810301700.2A CN201810301700A CN108632591A CN 108632591 A CN108632591 A CN 108632591A CN 201810301700 A CN201810301700 A CN 201810301700A CN 108632591 A CN108632591 A CN 108632591A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3185—Geometric adjustment, e.g. keystone or convergence
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/80—Analysis of captured images to determine intrinsic or extrinsic camera parameters, i.e. camera calibration
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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
- G09B5/06—Electrically-operated educational appliances with both visual and audible presentation of the material to be studied
- G09B5/065—Combinations of audio and video presentations, e.g. videotapes, videodiscs, television systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/90—Arrangement of cameras or camera modules, e.g. multiple cameras in TV studios or sports stadiums
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
Abstract
The invention discloses a kind of blackboard information regeneration share systems, including blackboard, camera, multimedia computer, display screen, server；Several cameras are disposed with above the blackboard, several cameras are fixed by the bracket above blackboard, and the camera is used to shoot the content on blackboard, and the camera is communicated to connect by data line and multimedia computer；The microphone for recording is electrically connected on the multimedia computer, the multimedia computer is attached by 3G/4G/WIFI networks with server；Writing on the blackboard information on blackboard is imaged by camera and image pickup signal is transmitted to multimedia computer by the present invention, multimedia computer carries out correction process to camera shooting and carries out matching storage together with voice messaging, and then by treated, information is shared by transmission of network to server；And real-time display can be carried out to writing on the blackboard information by display screen, facilitate the viewing teaching of student scene.
Description
Technical field
The invention belongs to share system fields, are related to a kind of blackboard information reproduction apparatus, specifically a kind of blackboard information is again
Existing share system.
Background technology
During conventional teaching, general teacher carries out traditional instruction on blackboard.Such traditional approach can not believe writing on the blackboard
Breath carries out storage and shares, and teacher body and arm during writing on the blackboard can block the content on blackboard, cause student not
The content on blackboard can completely be seen clearly, influence is caused on learning effect.And existing multi-media classroom is a set of throwing of setting
Shadow instrument imparts knowledge to students to courseware Projection Display, cannot be transformed on the basis of existing blackboard, can not embody traditional instruction effect
And share black board teaching content, teaching efficiency is poor.
In order to solve drawbacks described above, a solution is now provided.
Invention content
The purpose of the present invention is to provide a kind of blackboard information regeneration share systems.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of blackboard information regeneration share system, which is characterized in that including blackboard, camera, multimedia computer, display
Screen, server；
Several cameras are disposed with above the blackboard, several cameras are fixed by the bracket above blackboard,
The camera is used to shoot the content on blackboard, and the camera is communicated to connect by data line and multimedia computer；It is described
The microphone for recording is electrically connected on multimedia computer, the multimedia computer passes through 3G/4G/WIFI networks and service
Device is attached；
The multimedia computer is communicated to connect by data line and display screen, and the server storage has teaching camera shooting letter
Breath and voice messaging are simultaneously shared by network；
Wherein, the camera is used to acquire first video information in blackboard region and arrives the first video information transmission
Multimedia computer, the multimedia computer after receiving the first video information to the first video information as steps described below
Carry out designated treatment：
Step 1：Get the first video information；
Step 2：Image malformation correction is carried out to the first video information；
Step 3：Intelligent extraction is carried out to the first video information and gets the second video information of blackboard region；
Step 4：Projective transformation is carried out to the second video information and obtains projection video information；
The multimedia computer will treated that projection video information is transferred to display screen, described in the display screen receives
The projection video information and real-time display projection video information of multimedia computer transmission.
Further, the microphone is additionally operable to obtain recorded message in real time, and the microphone is for passing recorded message
Defeated to arrive multimedia computer, the multimedia computer is additionally operable to match integrating to projection video information and recorded message to obtain
Information is stored, the multimedia computer is used to carry out obtaining compression video information after compression processing to storage information, described more
Media computer is stored to server for student's download for that will compress video information transmission.
Further, in the designated treatment step 2 image malformation correction demarcated by using Zhang Shi calibration it is living
The parameter of camera is carried out calculating acquisition real scene picture by parameter；The process of the Zhang Shi calibration is as follows：
S1：A gridiron pattern is printed, it is pasted in one plane, as calibration object；
S2：By adjusting the direction of calibration object or video camera, the photo of some different directions is shot for calibration object；
S3：Characteristic point is extracted from photo；
S4：Five internal references and all outer ginsengs in the case of estimation ideal is distortionless；
S5：The distortion factor under physical presence radial distortion is estimated using least square method；
S6：Maximum-likelihood method, optimal estimating promote estimated accuracy；
S7：The pixel coordinate system of image is passed through into internal reference matrix conversion to camera coordinates system；It is carried out under camera coordinates system
Remove aberration；After removing aberration, camera coordinates system is transformed into image pixel coordinates system again；Source images are used in combination
Pixel value to the pixels of new images into row interpolation；After carrying out malformation correction for image information, effective figure is got
As information.
Further, intelligent extraction process is as follows in the designated treatment step 3：
S1：According to formulaOffset mean value is calculated, the Sh is point, radius centered on x
For the higher-dimension ball region of h；The k is the number put within the scope of Sh；The xi is the point within the scope of Sh；
S2：Central point is updated, central point is moved to offset mean location Xt+1=Mt+xt, the Mt is to be asked under t states
The offset mean value obtained；Xt is the center under t states；
S3：The offset mean value for introducing kernel function introduces the concept of kernel function in average drifting, can make calculating middle-range
Excentric point has the weights of bigger, shorter, the bigger characteristic of weights of reflection distance；
Improved offset mean value is：
S4：The original image information of preliminary treatment can be obtained according to offset mean value；
S5：Perspective transform is carried out to original image information；
S6：Blackboard region is extracted, efficient frontier is extracted.
Beneficial effects of the present invention：Writing on the blackboard information on blackboard is imaged by camera and will camera shooting by the present invention
Signal transmission to multimedia computer, multimedia computer carries out correction process to camera shooting and carries out matching storage together with voice messaging,
Then by treated, information is shared by transmission of network to server；And writing on the blackboard information can be carried out by display screen
Real-time display facilitates the viewing teaching of student scene；The present invention can realize the unobstructed reproduction of blackboard information, convenient for student viewing
Teaching improves teaching efficiency；Black board teaching information can be stored and be shared, realize the Web-based instruction, improve efficiency of teaching；It is multiple
Camera is imaged, and camera shooting is clear.
Description of the drawings
In order to facilitate the understanding of those skilled in the art, the present invention will be further described below with reference to the drawings.
Fig. 1 is integral structure layout's schematic diagram at blackboard of the present invention；
Fig. 2 is integral structure layout's schematic diagram at blackboard of the present invention；
Fig. 3 is blackboard extracted region schematic diagram of the present invention；
Fig. 4 is that blackboard region of the present invention minimum circumscribed circle seeks schematic diagram；
Fig. 5 is projection view of the present invention before carrying out projective transformation；
Fig. 6 is projection view of the present invention after carrying out projective transformation.
Specific implementation mode
As shown in Figs. 1-2, a kind of blackboard information regeneration share system, which is characterized in that including blackboard 1, camera 2, more
Media computer 3, display screen 4, server 6；
The top of the blackboard 1 is disposed with several cameras 2, and several cameras 2 are fixed by the bracket in blackboard 1
Top, the camera 2 are used to shoot the content on blackboard 1, and the camera 2 is communicated by data line with multimedia computer 3
Connection；The microphone for recording is electrically connected on the multimedia computer 3, the multimedia computer 3 passes through 3G/4G/WIFI
Network is attached with server 6；
The multimedia computer 3 is communicated to connect by data line and display screen 4, and the server 6 is stored with teaching camera shooting
Information and voice messaging are simultaneously shared by network；
Wherein, the camera 2 is used to acquire first video information in blackboard region and arrives the first video information transmission
Multimedia computer 3, the multimedia computer 3 is after receiving the first video information to the first video information according to following steps
It is rapid to carry out designated treatment：
Step 1：Get the first video information；
Step 2：Image malformation correction is carried out to the first video information；
Step 3：Intelligent extraction is carried out to the first video information and gets the second video information of blackboard region；
Step 4：Projective transformation is carried out to the second video information and obtains projection video information；
By treated, projection video information is transferred to display screen 4 to the multimedia computer 3, and the display screen 4 receives institute
State the projection video information and real-time display projection video information of the transmission of multimedia computer 3.
Further, the microphone is additionally operable to obtain recorded message in real time, and the microphone is for passing recorded message
Defeated to arrive multimedia computer 3, the multimedia computer 3 is additionally operable to projection video information and recorded message match to integrate
To storage information, the multimedia computer 3 is used to carry out obtaining compression video information, institute after compression processing to storage information
It states multimedia computer 3 and is stored to server 6 for student's download for video information transmission will to be compressed.
Further, in the designated treatment step 2 image malformation correction demarcated by using Zhang Shi calibration it is living
The parameter of camera is carried out calculating acquisition real scene picture by parameter；The process of the Zhang Shi calibration is as follows：
S1：A gridiron pattern is printed, it is pasted in one plane, as calibration object；
S2：By adjusting the direction of calibration object or video camera, the photo of some different directions is shot for calibration object；
S3：Characteristic point is extracted from photo；
S4：Five internal references and all outer ginsengs in the case of estimation ideal is distortionless；
S5：The distortion factor under physical presence radial distortion is estimated using least square method；
S6：Maximum-likelihood method, optimal estimating promote estimated accuracy；
Through the above steps, we just obtain five internal references with high estimated accuracy, and ginseng distorts with two outside three
Coefficient；Using these information, distortion correction, image rectification can be carried out.
Correcting process is as follows：Video camera internal reference matrix A is：
Distortion factor D=[k1, k2, k3, p1, p2]；
Fx=A (1,1)；%fx and fy is f/dx, f/dy respectively；
Fy=A (2,2)；%；
U0=A (1,3) %；Cx and cy optical centers position, and optical center position cx, cy are related with resolution ratio；
V0=A (2,3)；%；
K1=D (1)；%1 rank coefficient of radial distortion；
K2=D (2)；%2 rank coefficient of radial distortion；
K3=D (3)；%3 rank coefficient of radial distortion；
P1=D (4)；%1 rank tangential distortion coefficients；
P2=D (5)；%2 rank tangential distortion coefficients；
Go the operating procedure of distortion as follows：
S1：The pixel coordinate system of image is passed through into internal reference matrix conversion to camera coordinates system：
Y=(u-u0)/fy；
X=(v-v0)/fx；
S2：Aberration is carried out under camera coordinates system：
R=x2+y2；
X ＇=x* (1+k1*r+k2*r2+k3*r3)+2*p1*x*y+p2*(r+2*x2)；
Y ＇=y* (1+k1*r+k2*r2+k3*r3)+2*p2*x*y+p1*(r+2*y2)；；
S3：After removing aberration, camera coordinates system is transformed into image pixel coordinates system again：
X "=x ' * fx+u0；
Y "=y ' * fy+v0；；
S4：It is used in combination the pixel values of source images to the pixels of new images into row interpolation：
H=x "；
W=y "；
Wherein [] is rounding, and I2 is raw
At new figure, I1 is source images；
After by the above process for image information malformation correction, effective image information is got, if to
The dry continuous image information of frame constitutes continuous the first video information carried out after malformation correction.
Further, intelligent extraction process is as follows in the designated treatment step 3：
S1：According to formulaOffset mean value is calculated, the Sh is point, radius centered on x
For the higher-dimension ball region of h；The k is the number put within the scope of Sh；The xi is the point within the scope of Sh；
S2：Central point is updated, central point is moved to offset mean location Xt+1=Mt+xt, the Mt is to be asked under t states
The offset mean value obtained；Xt is the center under t states；
S3：The offset mean value of kernel function is introduced, kernel function is for calculating one of the inner product after being mapped to higher dimensional space
Kind of short-cut method, purpose be allow low-dimensional can not divided data become higher-dimension and can divide；Using kernel function, mapping relations can be ignored,
It completes to calculate directly in lower dimensional space；
The concept that kernel function is introduced in average drifting, can make the excentric point of calculating middle-range have the weights of bigger,
Shorter, the bigger characteristic of weights of reflection distance；
Improved offset mean value is：
Wherein, point centered on x；Xi is the point in bandwidth range；N is the quantity of the point in bandwidth range；G (x) is to core
The derivative of function asks negative
S4：The original image information of preliminary treatment can be obtained according to offset mean value；
Further, projective transformation process is as follows in the designated treatment step 4：
S1：Perspective transform is carried out to the second video information；Blackboard region is extracted, efficient frontier is extracted；
Four corner extractions of black surround are carried out first, as shown in figure 3, in above process, being carried to blackboard region
It takes, further extracts efficient frontier；Seek the minimum circumscribed circle of blackboard edges of regions again later；Such as according to geometrical model
It is found that being at least tangent with circumscribed circle there are three vertex shown in Fig. 4, it is assumed that for point 1, point 2 and point 3, seek a little 4 now；
SS1：Judge two vertex on class quadrangle diagonal line；
SS2：The more impartial region of two areas is divided the image into vertex 2 and 3, so 2 and 3 be the point on straight line,
Seek straight line l；
SS3：Class quadrangle is divided into two parts by straight line l, it is assumed that the areas a and the areas b, and put 1 in the areas a, then we seek
Point 4 traverses all marginal points in the areas b in the areas b, and the point farthest from straight line l is the 4th vertex point 4 of image；Obtain four
Vertex (x0, y0), (x1, y1), (x2, y2), (x3, y3).
S2：Perspective transform is carried out to blackboard region and solves transformation matrix；
SS1：Perspective transform is by picture projection to a new view plane, also referred to as projection mapping；
SS2：Seek reduction formula；
U, v are the original image left sides, correspond to Picture Coordinate x, y after being converted, wherein x=x'/w', y=y'/w'.
Transformation matrix4 parts can be splitted into,Indicate linear transformation, such as scaling,
Shearing and ratotion；[a31 a32] for translating, [a13 a23]TGenerate perspective transform；It is to be understood that at affine
Etc. the special shape for being perspective transform；Picture after perspective transform is not usually parallelogram (except non-mapping regard is put down
The face situation parallel with original plane)；
Transformation for mula before rewriting can obtain：
So, it is known that the corresponding several points of transformation can seek transformation for mula.Conversely, specific transformation for mula also can
Picture after the transformation asked.Simply see transformation of the square to quadrangle：
4 groups of corresponding points of transformation can be expressed as：
(0,0) → (x0, y0), (1,0) → (x1, y1), (1,1) → (x2, y2), (0,1) → (x3, y3)
It is obtained according to transformation for mula：
a31=x0
a11+a31-a13x1=x1
a11+a21+a31-a13x2-a23x2=x2
a21+a31-a23x3=x3
a32=y0
a12+a32-a13y1=y1
a12+a22+a32-a23y2-a23y2=y2
a22+a32-a23y3=y3
Define several auxiliary variables：
Δx1=x1-x2 Δx2=x3-x2 Δx3=x0-x1+x2-x3
Δy1=y1-y2 Δy2=y3-y2 Δy3=y0-y1+y2-y3
Δx3, Δ y3All be 0 when changing the plane with it is originally parallel, can obtain：
a11=x1-x0
a21=x2-x1
a31=x0
a12=y1-y0
a22=y2-y1
a32=y0
a13=0
a12=0
Δx3, Δ y3When not being 0, obtain：
a11=x1-x0+a12x1
a21=x3-x0+a12x2
a31=x0
a12=y1-y0+a13y1
a22=y3-y0+a23y3
a32=y0
S3：Original image information converted according to transformation matrix to obtain blackboard region pictorial information.
One square can be transformed to quadrangle by the transformation matrix solved.Conversely, quadrangle transforms to pros
Shape is also the same.As seen in figs. 5-6, then, we by converting twice：Quadrangle transforms to square+square fractal transform
Any one quadrangle can be transformed to another quadrangle to quadrangle.
Further, unobstructed processing procedure is as follows in the designated treatment step 4：
S1：Background modeling carries out the initialization of model；
S2：Classify to pixel, determines the foreground image of each frame；
S3：The rejecting in shield region；
Since video can be construed to continuous image sequence, the action that teacher writes in blackboard is a progressive mistake
Journey, hand are also a process gradually to blocking for blackboard；So in this process, specific to each frame of video, according to
According to forearm extraction technology, arm is extracted, occlusion area is marked, information when not being blocked with former frame is mended
Together, a new frame is formed, as present frame, is carried out with this, until action terminates.
Writing on the blackboard information on blackboard is imaged by camera and image pickup signal is transmitted to multimedia electricity by the present invention
Brain, multimedia computer carry out camera shooting correction process and to carry out matching storage together with voice messaging, then will treated information
Shared by transmission of network to server；And real-time display can be carried out to writing on the blackboard information by display screen, facilitate student existing
Field viewing teaching；The present invention can realize that the unobstructed reproduction of blackboard information, teaching convenient for student viewing improve teaching efficiency；Energy
It is enough to share the storage of black board teaching information, it realizes the Web-based instruction, improves efficiency of teaching；Multiple cameras are imaged, and camera shooting is clear
It is clear.
Above content is only to structure of the invention example and explanation, affiliated those skilled in the art
It makes various modifications or additions to the described embodiments or substitutes by a similar method, without departing from hair
Bright structure or beyond the scope defined by this claim, is within the scope of protection of the invention.
Claims (4)
1. a kind of blackboard information regeneration share system, which is characterized in that including blackboard (1), camera (2), multimedia computer
(3), display screen (4), server (6)；
Several cameras (2) are disposed with above the blackboard (1), several cameras (2) are fixed by the bracket in blackboard
(1) top, the camera (2) are used to shoot the content on blackboard (1), and the camera (2) passes through data line and multimedia
Computer (3) communicates to connect；The microphone for recording, the multimedia computer (3) are electrically connected on the multimedia computer (3)
It is attached by 3G/4G/WIFI networks and server (6)；
The multimedia computer (3) is communicated to connect by data line and display screen (4), and the server (6) is stored with teaching perturbation
Shared as information and voice messaging and by network；
Wherein, the camera (2) is used to acquire first video information in blackboard region and by the first video information transmission to more
Media computer (3), the multimedia computer (3) is after receiving the first video information to the first video information according to following steps
It is rapid to carry out designated treatment：
Step 1：Get the first video information；
Step 2：Image malformation correction is carried out to the first video information；
Step 3：Intelligent extraction is carried out to the first video information and gets the second video information of blackboard region；
Step 4：Projective transformation is carried out to the second video information and obtains projection video information；
By treated, projection video information is transferred to display screen (4) to the multimedia computer (3), and the display screen (4) receives
The projection video information and real-time display projection video information of multimedia computer (3) transmission.
2. a kind of blackboard information regeneration share system according to claim 1, which is characterized in that the microphone is additionally operable to
Recorded message is obtained in real time, and the microphone is used to recorded message being transferred to multimedia computer (3), the multimedia computer
(3) it is additionally operable to that projection video information and recorded message match integrating to obtain storage information, the multimedia computer (3) is used
Compression video information is obtained after carrying out compression processing to storage information, the multimedia computer (3) will be for that will compress video
Information is transferred to server (6) and is stored for student's download.
3. a kind of blackboard information regeneration share system according to claim 1, which is characterized in that the designated treatment step
Image malformation correction demarcates the parameter of camera living by using Zhang Shi calibration in two, is carried out calculating the true field of acquisition by parameter
Scape picture；The process of the Zhang Shi calibration is as follows：
S1：A gridiron pattern is printed, it is pasted in one plane, as calibration object；
S2：By adjusting the direction of calibration object or video camera, the photo of some different directions is shot for calibration object；
S3：Characteristic point is extracted from photo；
S4：Five internal references and all outer ginsengs in the case of estimation ideal is distortionless；
S5：The distortion factor under physical presence radial distortion is estimated using least square method；
S6：Maximum-likelihood method, optimal estimating promote estimated accuracy；
S7：The pixel coordinate system of image is passed through into internal reference matrix conversion to camera coordinates system；It is carried out under camera coordinates system abnormal
Become operation；After removing aberration, camera coordinates system is transformed into image pixel coordinates system again；The pixel of source images is used in combination
It is worth to the pixels of new images into row interpolation；After carrying out malformation correction for image information, effective image information is got.
4. a kind of blackboard information regeneration share system according to claim 1, which is characterized in that the designated treatment step
Intelligent extraction process is as follows in three：
S1：According to formulaOffset mean value is calculated, the Sh is the point centered on x, and radius is the height of h
Tie up ball region；The k is the number put within the scope of Sh；The xi is the point within the scope of Sh；
S2：Central point is updated, central point is moved to offset mean location Xt+1=Mt+xt, the Mt be t states under acquire it is inclined
Move mean value；Xt is the center under t states；
S3：The offset mean value for introducing kernel function introduces the concept of kernel function in average drifting, can make distance center in calculating
Point have bigger weights, reflection distance shorter, the bigger characteristic of weights；
Improved offset mean value is：
S4：The original image information of preliminary treatment can be obtained according to offset mean value；
S5：Perspective transform is carried out to original image information；
S6：Blackboard region is extracted, efficient frontier is extracted.
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Cited By (5)
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| CN109167974A (en) * | 2018-10-25 | 2019-01-08 | 洪磊 | A kind of writing on the blackboard recording system |
| CN109636793A (en) * | 2018-12-14 | 2019-04-16 | 中航华东光电（上海）有限公司 | The detection system and its detection method of display |
| CN110209873A (en) * | 2019-06-04 | 2019-09-06 | 北京梦想加信息技术有限公司 | Whiteboard secretary recording method, equipment, system and storage medium |
| CN110933331A (en) * | 2019-12-06 | 2020-03-27 | 浙江蓝鸽科技有限公司 | Teaching video synthesis method and system |
| CN111816007A (en) * | 2020-07-22 | 2020-10-23 | 安徽财经大学 | Multimedia teaching auxiliary system based on computer internet |
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