CN109327690A - The system and method calibrated automatically based on more projection three-dimensional display systems - Google Patents
The system and method calibrated automatically based on more projection three-dimensional display systems Download PDFInfo
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- CN109327690A CN109327690A CN201811198964.6A CN201811198964A CN109327690A CN 109327690 A CN109327690 A CN 109327690A CN 201811198964 A CN201811198964 A CN 201811198964A CN 109327690 A CN109327690 A CN 109327690A
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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]
- H04N9/3141—Constructional details thereof
- H04N9/3147—Multi-projection systems
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Abstract
The present invention relates to dimension display technologies fields, it discloses a kind of system and method calibrated automatically based on more projection three-dimensional display systems, solve the problems, such as in traditional technology it is big to more projection three-dimensional display system manual calibration difficulty, calibration accuracy is low.This method comprises: generating dot matrix image to be calibrated；It puts in order according to projector and inputs dot matrix image to be calibrated；CCD camera obtains camera space standard dot chart and projector dot chart to be calibrated；Mapping matrix is calculated, correct source images are obtained by mapping matrix change action；It drives CCD camera once to rotate 1 degree by precision rotation platform, completes the calibration of all projectors.In addition, the invention also provides a kind of systems calibrated automatically based on more projection three-dimensional display systems, suitable for the accurate calibration to more projection three-dimensional display systems.
Description
Technical field
The present invention relates to dimension display technologies fields, more particularly to one kind to be calibrated automatically based on more projection three-dimensional display systems
System and method.
Background technique
In projection display system, due to a variety of originals such as the position deviation of optical device installation and the incomplete ideals of performance
Cause, the image of projection often have position deviation and geometry distortion.For these deviations and distortion, can sometimes carry out manually
Calibration, but in the even super more optical projection systems of more optical projection systems, manual calibration is successively carried out to projector, and not only efficiency is lower,
And calibration accuracy is also difficult to ensure.Therefore, in the appraisement system of multi-projection display system, quickly and effectively image calibration side
Method is considered very important, and in the industry cycle internalization has obtained extensive concern in recent years.
The error of three-dimensional display system is often by the splicing precision etc. between hardware error, quality of optical imaging and projector
The comprehensive function of various factors, if in calibration only simple considerations any aspect be all it is inadequate, it is efficiently more
Projection light field three-dimensional display system image calibrating method should consider calibration automation, image resolution ratio and Three-dimensional Display effect simultaneously
Etc. many aspects.
Currently, academia lacks enough schemes for projecting the calibration of light field three-dimensional display system more, thus, research one
The kind automatic calibration program of the pervasive image in most of multi-projection display system has great practical value.
Summary of the invention
The technical problems to be solved by the present invention are: propose a kind of be based on what more projection three-dimensional display systems were calibrated automatically
System and method, solve the problems, such as in traditional technology it is big to more projection three-dimensional display system manual calibration difficulty, calibration accuracy is low.
The technical proposal adopted by the invention to solve the above technical problems is that:
The system calibrated automatically based on more projection three-dimensional display systems, comprising:
Array of rear-projectors, circumferential dispersion screen, precision rotation platform, CCD camera, controller；The precision rotation platform setting exists
The cylinder space center that circumferential dispersion screen surrounds is pasted with standard point system of battle formations paper inside the circumferential dispersion screen；The CCD
Camera is fixed on precision rotation platform, is connected with controller；The controller is connected with each projector in array of rear-projectors,
And it is connected with the stepper motor in precision rotation platform；Dot matrix image to be calibrated is projected in circumferential dispersion screen by the array of rear-projectors
On.
As advanced optimizing, the projector in the array of rear-projectors uses annular spread arranged at equal intervals.
In addition, being applied to upper the present invention also provides a kind of method calibrated automatically based on more projection three-dimensional display systems
State system comprising following steps:
A. according to the structural parameters of more projection three-dimensional display systems, pass through more projection three-dimensional display system image generation algorithms
Generate dot matrix image to be calibrated；
B. array of rear-projectors is controlled by controller, is inputted one by one into projector to school according to putting in order for projector
Quasi- dot matrix image；
C. when projector shows dot matrix image to be calibrated, control CCD camera obtains the standard dot matrix of camera space respectively
Figure and projector dot chart to be calibrated；
D. by image processing techniques, mapping matrix is calculated, by the change action of mapping matrix, obtains more projections three
Tie up correct source images of the current projector after calibration in display system；
E. after having calibrated a projector, precision rotation platform is controlled by controller, CCD camera is driven to rotate 1 degree, opened
Begin the calibration of next projector, repeats the calibration that step b-e is sequentially completed all projectors.
As advanced optimizing, in step a, the multi-projection display system image generation algorithm are as follows: for projector (0,
0 ,-D), it is located at (x1, y1-Dh, z1) on point projected image x/y plane coordinate are as follows:
In formula, D is the radius of array of rear-projectors, DhThe distance of xz plane, R are deviated for projectorhDeviate xz for viewpoint position
The distance of plane, R ' are z direction distance of the intersection point of screen and light to perspective plane, R1' it is z side of the viewpoint position to perspective plane
To distance.
As advanced optimizing, step d is specifically included: by image processing techniques, identifying the standard dot matrix of camera space
Scheme (s-image), the dot matrix image (o- to be calibrated of projector dot chart (p-image) to be calibrated and Projector Space
Image the characteristic point coordinate in), and mapping matrix is calculated by characteristic point coordinate, by the change action of mapping matrix, obtain
Much correct source images of the current projector after calibration in projection three-dimensional display system.
The beneficial effects of the present invention are:
Design based on the system that more projection three-dimensional display systems of the invention are calibrated automatically, using reconstruction of optical wave field principle,
By control CCD camera shooting, calculates and obtain a series of spatial image mapping relations, thus the correct source figure after being corrected
Picture；By control precision rotation platform drive CCD camera rotate automatically, can to each projector in array of rear-projectors carry out by
One automatically corrects；And since all projectors in so system are using the same standard dot chart, calibration standard is unified,
To realize the accurate calibration of system.The program can be manual to exist in the more projection three-dimensional display systems of effective solution as a result,
The problems such as difficulty is big, calibration accuracy is low is calibrated, the development of more projection three-dimensional display technologies is well pushed.
Detailed description of the invention
Fig. 1 is the automated calibration system structural schematic diagram in the present invention；In figure, 1 is circumferential dispersion screen, and 2 be to be pasted onto ring
Standard dot chart paper inside shape diffuser screen, 3 be array of rear-projectors, and 4 be precision rotation platform, and 5 be CCD camera.
Fig. 2 is automatic calibrating method flow chart of the invention.
Specific embodiment
In order to solve in traditional technology it is big to more projection three-dimensional display system manual calibration difficulty, calibration accuracy is low asks
Topic, the invention proposes a kind of automated graphics calibration methods for being applicable to the more projection three-dimensional display systems of reconstruction of optical wave field.It should
Method is based on reconstruction of optical wave field principle, is shot by CCD camera, calculates and obtains a series of spatial image mapping relations, realizes display
The image automatic straightening function of system.This method is widely used in the three-dimensional display system based on more projections, is a kind of raising
New departure of Three-dimensional Display effect, the program can be with there are manual calibration difficulty in the more projection three-dimensional display systems of effective solution
Greatly, the problems such as calibration accuracy is low well pushes the development of more projection three-dimensional display technologies.
Automated graphics calibration in realize the present invention, present invention firstly provides automated calibration system as shown in Figure 1,
Comprising: array of rear-projectors 3, circumferential dispersion screen 1, precision rotation platform 4, CCD camera 5, controller (not illustrating in figure)；The essence
The cylinder space center that circumferential dispersion screen 1 surrounds is arranged in close turntable 4, is pasted with mark inside the circumferential dispersion screen 1
System of battle formations paper 2 on schedule；The CCD camera 5 is fixed on precision rotation platform 4, is connected with controller；The controller and projector battle array
Each projector in column 3 is connected, and is connected with the stepper motor in precision rotation platform 4；The array of rear-projectors 3 will be to be calibrated
Dot matrix image is projected on circumferential dispersion screen 1.
Based on above-mentioned automated calibration system, the automatic calibrating method that the present invention realizes is as shown in Figure 2 comprising following to implement
Step:
Step 201, dot matrix image to be calibrated (o-image) is generated:
In this step, according to the structural parameters of more projection three-dimensional display systems, pass through more projection three-dimensional display system images
Generating algorithm generates dot matrix image to be calibrated；
In an example of the present invention, more projection three-dimensional display systems mainly by more projected arrays, circumferential dispersion screen and
Controller composition, specific structural parameters are as follows:
In more projection three-dimensional display systems, the projection in horizontal direction is considered first, two-dimensional image section is set as
X/y plane, then according to proj ective perspective relationship, the voxel (x of three-dimension object1, y1, z1), its x coordinate on the projection surface can be obtained are as follows:
Projection relation in the vertical direction, according to reconstruction of optical wave field theory, in order to make with a distance from x-axis for R1, viewpoint height
Corresponding voxel, the voxel (x of three-dimension object can be correctly seen for the human eye of H1, y1, z1) project to the y-coordinate on perspective plane
It should are as follows:
In conclusion being located at (x for projector (0,0 ,-D)1, y1-Dh, z1) on point projected image x/y plane seat
Mark should are as follows:
In formula, D is the radius of array of rear-projectors, DhThe distance of xz plane, R are deviated for projectorhDeviate xz for viewpoint position
The distance of plane, R ' are z direction distance of the intersection point of screen and light to perspective plane, R1' it is z side of the viewpoint position to perspective plane
To distance.Dynamic image is actually the continuous switching of number of frames per second still image, therefore generation dynamic image can use life
It can be complete by above more projection three-dimensional display system image generation algorithms at the mode for splicing synthesis after several still images
At the generation of dot matrix image to be calibrated.
Step 202, it puts in order according to projector and inputs dot matrix image to be calibrated:
In this step, array of rear-projectors is controlled by controller, according to putting in order one by one into projector for projector
Input dot matrix image to be calibrated；
The disposing way of more projected arrays be it is primary it needs to be determined that the problem of, it is assumed that shown by more projection three-dimensional display systems
Three-dimension object be made of many different voxels, then each voxel can have a distinctive light field, three-dimensional article
The light field of body is then the set of all voxel light fields.Assuming that shown three-dimension object is the inside screen in arbitrary shape,
The light field that then object is issued will necessarily meet at a series of point with screen, and in these point of intersection, light is all a vector, institute
The information of carrying further comprises directional information other than strength information.If we can be by specific mode, complete weight
The field information of all intersection points on existing screen, even when inside screen does not have three-dimension object voxel, observer is in screen external enwergy
See that the light of reconstruct is raised, seemingly these light fields are issued by the three-dimensional dimension object voxel in screen, and here it is light field weights
The basic principle of structure dimension display technologies.
In order to realize that above-mentioned technical though, more projected arrays of the present invention use the arranged at equal intervals side of annular spread
Formula reconstructs the light of different directions inside annular screen cylindrical space.Theoretically, the projector angles in array of rear-projectors
The closeer be spaced the better, can just make the angular resolution for reconstructing the three-dimension object come sufficiently small in this way, to give the good sight of observer
See experience.But the limitation of surface structure and system cost of implementation due to business projector, in order to enable adjacent projectors
Even closer splicing, system structure use the arrangement mode of longitudinal 5 rows, and the interval of every row is equal, every projector
Between angle between be divided into 1 degree.Vertical separation point of the four row's projectors to row's projector topmost below system is designed
It is not -80mm, -160mm, -240mm and -320mm.In order to realize the field stitching for accomplishing neighboring projectors in the horizontal direction,
The angle interval of array of rear-projectors needs to match with the transverse scattering angle of diffuser screen, therefore is taken as 1 °.Determining specific projection
After the putting in order of instrument, array of rear-projectors is controlled by console, inputs dot matrix to be calibrated according to putting in order for projector
Image.
Step 203, CCD camera obtains camera space standard dot chart (s-image) and projector dot chart (p- to be calibrated
Image):
In this step, when projector shows dot matrix image to be calibrated, controller control CCD camera is pasted by shooting
Standard dot chart paper and projector inside circumferential dispersion screen, which come out, projects dot chart, to obtain camera space respectively
Standard dot chart (s-image) and projector dot chart (p-image) to be calibrated.
Step 204, mapping matrix is calculated, correct source images are obtained by mapping matrix change action:
In this step, by image processing techniques, the standard dot chart (s-image) of camera space is identified, it is to be calibrated
Characteristic point coordinate in the dot matrix image to be calibrated (o-image) of projector dot chart (p-image) and Projector Space,
And mapping matrix is calculated by characteristic point coordinate, pass through the change action of mapping matrix, so that it may it is aobvious to obtain more projection three-dimensionals
Show correct source images of the system after calibration.
It is empty by the dot matrix image to be calibrated (o-image) and camera of Projector Space in an example of the present invention
Between the characteristic point coordinate of projector dot chart (p-image) to be calibrated calculate mapping relations matrix M1, following institute
Show:
P-image=o-image*M1
Then, the mapping relations matrix M of Projector Space and camera space is utilized1, can calculate in Projector Space
Dot matrix image (c-image) after calibration, as follows:
C-image=s-image*M1 -1
Finally, dot matrix image (the c- in Projector Space after dot matrix image (o-image) to be calibrated and calibration is calculated
Image the mapping relations matrix M between)2, it is as follows:
M2=o-image-1×c-image
Wherein, mapping matrix M2Can be adapted for it is any by more projection three-dimensional display system image generation algorithms for three-dimensional
Scene source images generated.Pass through the change action of the matrix, so that it may obtain more projection three-dimensional display systems by calibration
Correct source images afterwards.
Step 205, it drives CCD camera once to rotate 1 degree by precision rotation platform, completes the calibration work of all projectors
Make:
In this step, in order to realize the automatic calibration of 360 projectors, for array of rear-projectors annular arrangement in the system
The characteristics of, process control precision rotation platform has been intentionally introduced into calibration process, after having calibrated a projector, console meeting
Controlling precision rotation platform drives CCD camera to rotate 1 degree, repeats the above calibration process, completes the calibration of next projector.
By constantly repeating the above calibration process, calibration until completing all projectors, then all projectors in system according to
Standard dot chart depending on pasting has a unified calibration standard, to realize the accurate calibration of system.
Claims (5)
1. the system calibrated automatically based on more projection three-dimensional display systems characterized by comprising
Array of rear-projectors, circumferential dispersion screen, precision rotation platform, CCD camera, controller；The precision rotation platform is arranged in annular
The cylinder space center that diffuser screen surrounds is pasted with standard point system of battle formations paper inside the circumferential dispersion screen；The CCD camera
It is fixed on precision rotation platform, is connected with controller；The controller is connected with each projector in array of rear-projectors, and with
Stepper motor in precision rotation platform is connected；Dot matrix image to be calibrated is projected on circumferential dispersion screen by the array of rear-projectors.
2. the system calibrated automatically based on more projection three-dimensional display systems as described in claim 1, which is characterized in that the throwing
Projector in shadow instrument array uses annular spread arranged at equal intervals.
3. being applied to automatic calibration as claimed in claim 1 or 2 based on the method that more projection three-dimensional display systems are calibrated automatically
System in, which comprises the following steps:
A. it according to the structural parameters of more projection three-dimensional display systems, is generated by more projection three-dimensional display system image generation algorithms
Dot matrix image to be calibrated；
B. array of rear-projectors is controlled by controller, inputs point to be calibrated into projector one by one according to putting in order for projector
System of battle formations picture；
C. when projector shows dot matrix image to be calibrated, control CCD camera obtain respectively camera space standard dot chart and
Projector dot chart to be calibrated；
D. by image processing techniques, mapping matrix is calculated, by the change action of mapping matrix, it is aobvious to obtain more projection three-dimensionals
Show correct source images of the current projector after calibration in system；
E. after having calibrated a projector, precision rotation platform is controlled by controller, CCD camera is driven to rotate 1 degree, under starting
The calibration of one projector repeats the calibration that step b-e is sequentially completed all projectors.
4. the method calibrated automatically based on more projection three-dimensional display systems as claimed in claim 3, which is characterized in that step a
In, the multi-projection display system image generation algorithm are as follows: for projector (0,0 ,-D), be located at (x1, y1-Dh, z1) on point
The coordinate of projected image x/y plane are as follows:
In formula, D is the radius of array of rear-projectors, DhThe distance of xz plane, R are deviated for projectorhDeviate xz plane for viewpoint position
Distance, R ' is z direction distance of the intersection point of screen and light to perspective plane, R1' for viewpoint position to perspective plane the direction z away from
From.
5. the method calibrated automatically based on more projection three-dimensional display systems as claimed in claim 3, which is characterized in that step d
Specifically include: by image processing techniques, identifying the standard dot chart of camera space, projector dot chart to be calibrated and
Characteristic point coordinate in the dot matrix image to be calibrated of Projector Space, and mapping matrix is calculated by characteristic point coordinate, pass through
The change action of mapping matrix obtains correct source images of the current projector after calibration in more projection three-dimensional display systems.
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| CN103713457A (en) * | 2013-12-12 | 2014-04-09 | 浙江大学 | Geometrical correction device and method for 360-degree annular screen multi-projection system |
| CN103777455A (en) * | 2014-02-25 | 2014-05-07 | 浙江大学 | Spherical immersion three-dimension displaying method and system based on light field splicing |
| US20170374331A1 (en) * | 2016-06-27 | 2017-12-28 | Intel Corporation | Auto keystone correction and auto focus adjustment |
-
2018
- 2018-10-15 CN CN201811198964.6A patent/CN109327690A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692808A (en) * | 2012-05-09 | 2012-09-26 | 南京航空航天大学 | Large-scene 360-degree panorama dynamic display method, and display system |
| CN103713457A (en) * | 2013-12-12 | 2014-04-09 | 浙江大学 | Geometrical correction device and method for 360-degree annular screen multi-projection system |
| CN103777455A (en) * | 2014-02-25 | 2014-05-07 | 浙江大学 | Spherical immersion three-dimension displaying method and system based on light field splicing |
| US20170374331A1 (en) * | 2016-06-27 | 2017-12-28 | Intel Corporation | Auto keystone correction and auto focus adjustment |
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