CN108696730A - A kind of more projection 3D light field image automatic calibrating methods - Google Patents
A kind of more projection 3D light field image automatic calibrating methods Download PDFInfo
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- CN108696730A CN108696730A CN201710133133.XA CN201710133133A CN108696730A CN 108696730 A CN108696730 A CN 108696730A CN 201710133133 A CN201710133133 A CN 201710133133A CN 108696730 A CN108696730 A CN 108696730A
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Abstract
The invention discloses one kind projecting 3D light field image automatic calibrating methods more, is related to 3D display technical field, includes the following steps:1, according to system structure parameter, dot matrix image to be calibrated is generated;2, standard dot chart paper printed in advance is pasted on the inside of annular screen, projects complete white picture respectively by projecting apparatus and dot matrix image to be calibrated, CCD camera obtain dot chart and dot chart respectively;3, the mapping relations matrix between the projector dot chart to be calibrated of the dot matrix image and camera space to be calibrated of Projector Space is calculated;4, using the mapping relations matrix of Projector Space and camera space, the corresponding dot matrix image of Projector Space internal calibration dot matrix image can be calculated;5, the mapping relations matrix between the dot matrix image in Projector Space after dot matrix image to be calibrated and calibration can be calculated.The present invention realizes that the automatic calibration function of display system, display effect are greatly improved.
Description
Technical field
The present invention relates to 3D display technical field, especially a kind of more projection 3D light field image automatic calibrating methods.
Background technology
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
The image of cause, projection often carries 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, it is not only less efficient to carry out manual calibration successively to projecting apparatus,
And calibration accuracy is also difficult to demonstrate,prove.And the error of three-dimensional display system is often by hardware error, quality of optical imaging and projection
The comprehensive function of the various factors such as the splicing precision between instrument, if the consideration any aspect only simple in calibration is all
Inadequate, efficient more projection light field orchid dimension display system image calibrating methods should consider calibration automation, image point simultaneously
The many aspects such as resolution and Three-dimensional Display effect.Currently, academia lacks more for projecting the calibration of light field Wang Wei display systems
Enough reports, a kind of pervasive image automatic calibrating method in most of multi-projection display system of research have prodigious practicality
Change value.
Invention content
A kind of more projection 3D light field image automatic calibrating methods proposed by the present invention, realize the automatic calibration of display system.
The technical proposal of the invention is realized in this way:
A kind of more projection 3D light field image automatic calibrating methods, include the following steps:
Step 1, according to system structure parameter, dot matrix image to be calibrated is generated;
Step 2, standard dot chart paper printed in advance is pasted on the inside of annular screen, is projected respectively by projecting apparatus complete
White picture and dot matrix image to be calibrated obtain the bridge of the camera space system of battle formations (s- on schedule respectively positioned at the CCD camera of center Screen
) and projector dot chart (p-image) to be calibrated image;
Step 3, dot matrix image to be calibrated (o-image) and the throwing to be calibrated of camera space of Projector Space are calculated
Shadow instrument projects the mapping relations matrix (M between dot chart (p-image)1);
Step 4, the mapping relations matrix (M of Projector Space and camera space is utilized1), Projector Space can be calculated
The corresponding dot matrix image of internal calibration dot matrix image (c-image);
Step 5, the tired dot chart as after (o-image) and calibration of dot matrix to be calibrated in Projector Space can be calculated
As the mapping relations matrix (M between (c-image)2)。
More projection 3D light field image automatic calibrating methods provided by the invention, advantage are:Utilize reconstruction of optical wave field
Principle directly acquires a series of spatial image mapping relations, and cooperation CCD shootings obtain, and realize the automatic calibration work(of display system
Can, display effect is greatly improved.This method is widely used in the Wang Wei display systems based on reconstruction of optical wave field, is a kind of
Improve new departure of Three-dimensional Display effect.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art
With obtain other attached drawings according to these attached drawings.
Fig. 1 is automated calibration system structural schematic diagram;
Fig. 2 is the calibration of picture portion domain and mapping relations schematic diagram;
Fig. 3 is automatic calibrating method work flow diagram.
Specific implementation mode
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 describes, 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 every other
Embodiment shall fall within the protection scope of the present invention.
The present embodiment proposes a kind of more projection 3D light field image automatic calibrating methods, uses and is calibrated from the one kind set up is automatic
System, structuralism include:PC materials annular screen 1 is attached to the standard dot chart paper 2 of 1 inside of annular screen, annular array
Array of rear-projectors 3 and the CCD camera 4 being fixed on precision rotation platform in annular screen 1, as shown in Figure 1.This method
By taking a projecting apparatus as an example, to analyze the detailed process of geometric calibration:
Step 1, according to system structure parameter, dot matrix image to be calibrated is generated;
Step 2, standard dot chart paper printed in advance is pasted on the inside of annular screen, is projected respectively by projecting apparatus complete
White picture and dot matrix image to be calibrated obtain the bridge of the camera space system of battle formations (s- on schedule respectively positioned at the CCD camera of center Screen
) and projector dot chart (p-image) to be calibrated image;
Step 3, dot matrix image to be calibrated (o-image) and the throwing to be calibrated of camera space of Projector Space are calculated
Shadow instrument projects the mapping relations matrix (M between dot chart (p-image)1), as follows,
P-image=o-image*M1
Step 4, the mapping relations matrix (M of Projector Space and camera space is utilized1), Projector Space can be calculated
The corresponding dot matrix image of internal calibration dot matrix image (c-image), as follows,
C-image=s-image*M1 -1
Step 5, the tired dot chart as after (o-image) and calibration of dot matrix to be calibrated in Projector Space can be calculated
As the mapping relations matrix (M between (c-image)2), as follows,
M2=o-image-1*c-image
Wherein, mapping matrix M obtained above2It can be applicable in any by the generation of more projection three-dimensional display system images
The source images that algorithm is generated by three-dimensional scenic.Pass through the change action of the matrix, so that it may aobvious more projection three-dimensionals are calculated
Show correct source images of the system after calibration.In order to realize the automatic calibration of several (such as 360) projecting apparatus, for this
Projecting apparatus drops the characteristics of row annular arrangement in system, can introduce programme control precision turntable in calibration process, calibrate one
After projecting apparatus, computer can control precision rotation platform and CCD camera is driven to rotate 1 °, repeat the above calibration process, complete next
The calibration king of platform projecting apparatus makees.By constantly repeating the above calibration process, the calibration until completing all projecting apparatus, then system
In all projecting apparatus according to standard dot chart depending on being puted up, there are one unified calibration standards, to realize the school of system
It is accurate.
During specific implementation, since view field's area of projecting apparatus is larger, in order to ensure calibration accuracy, when calibration
Region division can be carried out to image, the result after calibrating like that is exactly mapping matrix M2Array, each mapping in the array
Matrix M2All some specific regions of correspondence image, as shown in Figure 2.
In theory, the point in standard dot chart obtains closeer, and calibration accuracy is higher, and ideal situation is exactly can
Accurately calculate the mapping relations of each pixel, that is to say, that projecting apparatus launches a pixel every time, and shooting obtains it
Image, and then calculate mapping.But in specific operation process, each pixel correction will be taken considerable time successively in this way,
And it is unfavorable for the high speed processing of image during Dynamic Announce, therefore this is not an optimal solution.So most
Following region splitting scheme is used eventually:Vertical direction point spacing:10cm;Horizontal direction point spacing:5/180*pi*150cm=
13.1cm。
Mathematically, it shoots between grid and projecting apparatus inner mesh there may be the mapping relations for meeting entire grid,
But since screen is arc, and there is a fixed angle of altitude when camera shooting, so this mapping is complicated, nonlinear, this
It is unfavorable for software calculating.So needing to use approximation method, whole image is divided into multiple regions by grid, in each zonule
It is interior, it is believed that mapping has linear relationship, and there are different mapping relations in different regions.More accurate experiment in order to obtain
As a result, algorithm is split rectangular area again, it is divided into upper left and the delta-shaped region of bottom right two, to this delta-shaped region point
Affine transformation is not calculated.The function of affine transformation is to carry out Linear Mapping from a two-dimensional coordinate to another two-dimensional coordinate,
Conversion process can be indicated with following matrix.
In order to determine 6 parameter values in transformation torch battle array, the coordinate of 2 groups of each 3 not conllinear points, institute above are at least needed
The delta domain classification method three obtained apex coordinate of proposition meets this condition, it is possible to acquire the affine square of target
Battle array, the matrix are equally applicable to the pixel inside corresponding delta-shaped region.
The calibration method has certain universality, can be adapted for the more projection three-dimensional display systems of existing major part.
Entire calibration process can admittedly be concluded with workflow, as shown in Figure 3.
This method utilizes reconstruction of optical wave field principle, directly acquires a series of spatial image mapping relations, and cooperation CCD shootings obtain
It takes, realizes that the automatic calibration function of display system, display effect are greatly improved.This method is widely used in being based on light
The Wang Wei display systems of field reconstruct are a kind of new departures improving Three-dimensional Display effect.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (1)
1. a kind of more projection 3D light field image automatic calibrating methods, which is characterized in that bearing calibration includes the following steps:
Step 1, according to system structure parameter, generate dot matrix image to be calibrated;
Step 2 pastes standard dot chart paper printed in advance on the inside of annular screen, projects complete white figure respectively by projecting apparatus
Piece and dot matrix image to be calibrated obtain the calibration dot chart (s- of camera space positioned at the CCD camera of center Screen respectively
) and projector dot chart (p-image) to be calibrated image;
Step 3 calculates the dot matrix image to be calibrated (o-image) of Projector Space and the projecting apparatus to be calibrated of camera space
Project the mapping relations matrix (M between dot chart (p-image)1);
Step 4 utilizes the mapping relations matrix (M of Projector Space and camera space1), school in Projector Space can be calculated
The corresponding dot matrix image (c-image) of quasi- dot matrix image;
The dot matrix image after dot matrix image (o-image) to be calibrated and calibration in Projector Space can be calculated in step 5
(c-image) the mapping relations matrix (M between2)。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110830781A (en) * | 2019-10-30 | 2020-02-21 | 歌尔科技有限公司 | Automatic projected image correction method and system based on binocular vision |
| CN115225875A (en) * | 2022-06-17 | 2022-10-21 | 苏州蓝博控制技术有限公司 | Auxiliary display device of excavator and display method thereof |
-
2017
- 2017-03-08 CN CN201710133133.XA patent/CN108696730A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110830781A (en) * | 2019-10-30 | 2020-02-21 | 歌尔科技有限公司 | Automatic projected image correction method and system based on binocular vision |
| CN110830781B (en) * | 2019-10-30 | 2021-03-23 | 歌尔科技有限公司 | Automatic projected image correction method and system based on binocular vision |
| US11606542B2 (en) | 2019-10-30 | 2023-03-14 | Goertek Inc. | Projection image automatic correction method and system based on binocular vision |
| CN115225875A (en) * | 2022-06-17 | 2022-10-21 | 苏州蓝博控制技术有限公司 | Auxiliary display device of excavator and display method thereof |
| CN115225875B (en) * | 2022-06-17 | 2023-12-01 | 苏州蓝博控制技术有限公司 | Display method of auxiliary display device of excavator |
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Application publication date: 20181023 |