CN107121786B - The calibration method of integration imaging light field display system lens array - Google Patents
The calibration method of integration imaging light field display system lens array Download PDFInfo
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- CN107121786B CN107121786B CN201710378464.XA CN201710378464A CN107121786B CN 107121786 B CN107121786 B CN 107121786B CN 201710378464 A CN201710378464 A CN 201710378464A CN 107121786 B CN107121786 B CN 107121786B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
- G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/50—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels
- G02B30/52—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels the 3D volume being constructed from a stack or sequence of 2D planes, e.g. depth sampling systems
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Abstract
The invention belongs to the light field field of display technology based on integration imaging, and in particular to the calibration method of lens array in light field display system.Integration imaging light field display system includes display panel, lens array and directional diffuser screen, error problem present in assembling process for lens array, the present invention proposes a kind of reduction lenslet array center position deviation and a kind of method for eliminating lenslet array center position deviation, its basic thought are as follows: the line and directional diffuser screen of perfect lens optical center position and respective display unit center have intersection point, as a reference point with this intersection point；The center load verification image of display unit is corresponded in perfect lens, which can be imaged after actual lens in directional diffuser screen；Further according to actual imaging position calibration process corresponding with the progress of the position deviation of reference point, to reduce or eliminate lenslet array center position deviation.
Description
Technical field
The invention belongs to the light field field of display technology based on integration imaging, and in particular to lens array in light field display system
The calibration method of column.
Background technique
Integration imaging includes two processes of record and reproduction of three-dimensional scenic.In recording process, lens array and record are situated between
Matter (such as charge-coupled device (CCD), complementary metal oxide semiconductor (CMOS) or film) emits beam to three-dimensional scenic
Directional information and luminance information are sampled, and two-dimensional cell pattern matrix, each cell picture in cell picture array are obtained
All be its corresponding lens to three-dimensional scenic at picture, include the different parallax informations of three-dimensional scenic.During display, record
Two-dimensional cell pattern matrix be shown on two-dimentional display panel, such as liquid crystal display panel (LCD), light that cell picture issues
3-D image is formed by reconstructing after lens array or pinhole array.The record and reproducing processes of integration imaging do not need coherent light
The Three-dimensional Display, it can be achieved that the continuous parallax of naked eye, true color is illuminated, in certain angular field of view, for more people in different directions
It watches simultaneously.The visible resolution of traditional integration imaging is limited by lens separation, and to increase visible resolution, building is based on collection
At the light field display system of imaging: directional diffuser screen is placed in a certain depth plane of reconstruct three-dimension object, thus in diffuser screen
One section of front and back depth bounds in human eye can obtain higher visible resolution.
Ideally, the center of all lens and corresponding display unit center in integration imaging light field display system
The line of position should be it is parallel, more precisely, they should be each perpendicular to display panel.However in actual conditions, thoroughly
The assembling process of lens array can have error, can generate offset horizontal and vertical, cause the decline of three-dimensionalreconstruction precision, imaging
The deterioration of quality, it is therefore desirable to which the position of each lens is calibrated.The present invention relates to the lateral shifts of lens position
Calibration method.
First technology " a kind of the array image for lens array be registrated template " (Chinese patent, application number:
CN103824288A), there is error in lens array process, a kind of array image is disclosed with quasi-mode
Plate, but the template is complex.
The present invention proposes the calibration method of integration imaging light field display system lens array, specifically includes a kind of reduction center
The method of position lateral deviation and a kind of method for eliminating center lateral deviation.
Summary of the invention
The purpose of the present invention is to propose to the calibration methods of integration imaging light field display system lens array, it is ensured that each lens
The center lateral registration of optical center position and corresponding display unit promotes imaging display matter to improve the precision of three-dimensionalreconstruction
Amount.
It is a feature of the present invention that integration imaging light field display system includes display panel, lens array and directional scattering
Shield, loads corresponding cell picture array on display panel, ideally, center and the respective lens optical center of cell picture
Line should be parallel (i.e. lateral registration), and perpendicular to display panel；And under actual conditions, due to the assembly of lens array
There are errors, can generate lateral offset, and the center of each display unit and the line of respective lens optical center are no longer parallel.If still
So corresponding cell picture is loaded according to the position of perfect lens, it will the decline of three-dimensionalreconstruction precision is caused, image quality
Deteriorate.For above situation, the present invention is proposed in a kind of reduction lenslet array center position deviation and a kind of elimination lens array
The method of heart position deviation.
The method that center deviation is reduced using the present invention are as follows: each perfect lens optical center and corresponding display unit center
Line has intersection point in directional diffuser screen, marks these intersection points in directional diffuser screen and as reference point, it is ideal thoroughly
The center load verification image of mirror corresponding unit image, such as " ten " glyph image, the image are acted on through actual lens, it will
Imaging can have deviation to directional diffuser screen between the center of imaging and before mark point.It is accurately controlled by program at this time
The loading position of " ten " glyph image, makes it be gradually deviated from the central point of perfect lens corresponding unit image, and the image is through reality
Imaging gradually approaches the reference point in directional diffuser screen after the lens of border, and when the two is overlapped, program stopped will " ten " word at this time
Lateral position of the loading position of shape image as actual lens optical center.After all doing aforesaid operations to all lens, lens array
The calibration of the lateral position at column center is completed, and the center of lens is the centre bit of the corresponding unit image of display panel load
It sets.By mathematical analysis it is found that when using above method, the lateral deviation of optical center of lens position will reduce, reduce degree with
The enlargement ratio of lens imaging system is related.
The method that center deviation is eliminated using the present invention are as follows: image will be verified, such as " ten " glyph image, load famous dictum
Think the center position of lens corresponding unit image, which acts on through actual lens, it will imaging to directional diffuser screen, it is each to manage
Think that optical center of lens and the line of corresponding unit picture centre have intersection point in directional diffuser screen, it can be with precise measurement actual imaging
Position deviation between position and ideal intersection point, and then the correction of actual lens corresponding unit image center location is calculated
Amount, completes the calibration of lens array.
Detailed description of the invention
Implementation example figure:
The attached drawing of the calibration method of integration imaging light field display system lens array provided by the invention has 5
The positional diagram of Fig. 1 ideally display panel, lens array and directional diffuser screen.
The positional diagram of display panel, lens array and directional diffuser screen under Fig. 2 actual conditions.
The schematic diagram of the calibration method of Fig. 3 integration imaging light field display system lens array.
The offset and the front view after lens array calibration that Fig. 4 " ten " font verifies image relative lens.
Fig. 5 is using the effect picture for realizing that image quality is promoted after reduction center deviation calibration method.
In FIG. 1 to FIG. 3, (1)-display panel, (2)-lens array, (3)-directional diffuser screen.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention " is integrated into below in conjunction with attached drawing
As the calibration method of light field display system lens array " embodiment is described in further detail.
Fig. 1 is the positional diagram of ideally display panel, lens array and directional diffuser screen.Display panel
(1) center of loading unit pattern matrix on, each unit image is expressed as C1, C2, C3... it is placed immediately ahead of each display unit
One lens, forms lens array (2), and the optical center of each lens is expressed as O1, O2, O3... each display unit center and it is corresponding thoroughly
The line of mirror optical center and the intersection point of directional diffuser screen (1) are R1, R2, R3... ideally, each unit picture centre and lens
The line of optical center should be parallel, more precisely, they should be each perpendicular to display panel (1).
Fig. 2 is the positional diagram of display panel, lens array and directional diffuser screen under actual conditions.Due to lens
There are errors in the assembling process of array (2), can generate lateral shift.At lens array (2) position, solid line indicates ideal saturating
The position of mirror, dotted line indicate the position of actual lens, and the optical center of each perfect lens is expressed as O1, O2, O3... each actual lens
Optical center is expressed as O '1, O '2, O '3... at this point, each display unit center and the line of actual lens optical center are no longer parallel, if
Simultaneously loading unit pattern matrix still is generated according to perfect lens position, it will causes the decline of three-dimensionalreconstruction precision, image quality
Deterioration.
Fig. 3 is the schematic diagram of the calibration method of integration imaging light field display system lens array.Assuming that lens array (2)
Z-axis coordinate is 0, and the z-axis coordinate of directional diffuser screen (3) is l, and the z-axis coordinate of display panel (2) is-g, is imaged as with simple lens
Example is illustrated, and solid box indicates the position of perfect lens, its optical center is denoted as O point, CerrPoint indicates perfect lens corresponding unit
The desired center position of image, CerrPoint is denoted as R point with the line of O point and the intersection point of directional diffuser screen.Due to being deposited when lens arrangement
In error, actual lens position can deviate the position of perfect lens, and dotted line frame indicates the position of actual lens, its optical center is denoted as
O ' point, CoptPoint indicates the practical center position of actual lens corresponding unit image, CoptPut the line and directional scattering with O '
The intersection point of screen is denoted as RoptPoint.If at this time will CerrCenter of the point as actual lens corresponding unit image, CerrPoint with
O ' lines and the intersection point of directional diffuser screen are denoted as RerrPoint, the point will much deviate correct image point position RoptPoint.
Center deviation is reduced using method one.According to the optical center O point and corresponding units picture centre C of perfect lenserr
The positional relationship of point, is marked R point in directional diffuser screen, it represents the ideal position of optical center of lens, hereafter aobvious
Show the desired center position C of uniterrPlace's load verification image, such as " ten " glyph image, after actual lens, " ten " font figure
The center of picture can be imaged to RerrPlace writes the loading position of program adjustment control " ten " glyph image, when " ten " glyph image
It is overlapped after middle the heart channel of Hang-Shaoyin actual lens imaging with the R point in directional diffuser screen, stops movement, at this time the load position of " ten " glyph image
It is set to CcalPoint, we are by CcalActual loaded position of the point as cell picture.
Before not calibrated, cell picture is loaded in CerrPlace, the picture point after actual lens are located at RerrPlace, the line of this two o'clock
Angle with horizontal direction isAfter calibration, cell picture is loaded in CcalPlace, the picture after actual lens
At R, the line of this two o'clock and the angle of horizontal direction are pointM be lens at
As the amplification factor of system.Due to M > 1, then β < α, it is seen that this method can effectively reduce the deviation of center.
Center deviation is eliminated using method two.Load verification image, such as " ten " glyph image are located at its center
CerrPlace, the picture point after actual lens are located at RerrPlace, precise measurementValue calculates correcting valueAccording to CerrPosition and correcting value find respective point Copt, which is accurate lens centre
Lateral position.
Fig. 4 is the offset and the front view after lens array calibration that " ten " font verifies image relative lens.Fig. 4 (a) is
The front view of each " ten " font verification image relative lens offset, " ten " glyph image are not arranged neatly before lens array calibration
Column, deviation is larger, and Fig. 4 (b) is the front view after calibration, and each " ten " font verifies image proper alignment.
Fig. 5 is using the effect picture for realizing that image quality is promoted after reduction center deviation calibration method.Fig. 5 (a) is
Integration imaging light field display effect before calibration, Fig. 5 (b) be calibration after integration imaging light field display effect, Fig. 5 (b) at
More preferably, image is apparent for image quality amount,
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (1)
1. a kind of calibration method of integration imaging light field display system lens array, which is characterized in that the integration imaging light field
Display system includes display panel (1), lens array (2) and directional diffuser screen (3), loading unit on the display panel (1)
Pattern matrix, each cell picture and lens correspond, and calibrate the optical center of rear lens and the central cross weight of cell picture
It closes, cell picture array reconstructs three-dimensional scenic after lens array (2) project, and places in a certain plane of reconstruct three-dimensional scenic
Directional diffuser screen (3) improves visual point of the integration imaging of the human eye viewing in latter section of depth bounds of directional diffuser screen (3)
Resolution；
For lens in lens array (2) there are error in assembling process, the spacing of lens is not definite value, actual lens position meeting
Deviate perfect lens position, reduce the lateral deviation of lens array (2) optical center position using following methods:
A. perfect lens optical center has with the line at the center of corresponding units image on display panel (1) with directional diffuser screen (3)
Intersection point, marks that the intersection point is as a reference point on directional diffuser screen (3), all reference points spacing having the same；
B. load verification image, the center for verifying image are overlapped with the center of cell picture on display panel (1), the check plot
As that can be imaged on directional diffuser screen (3) after actual lens, there are deviation between the center and reference point of imaging, in order to
It is obtained in directional diffuser screen (3) clearly as directional diffuser screen (3) is located at saturating imaging plane；
C. the loading position of adjustment verification image, makes it be gradually deviated from the central point of perfect lens corresponding unit image, the verification
Imaging can gradually approach corresponding reference point on directional diffuser screen (3) after middle the heart channel of Hang-Shaoyin actual lens of image；
D. when verification image is overlapped through actual lens imaging with reference point on directional diffuser screen (3), image will be verified at this time
Central point of the loading position as actual lens corresponding unit image, and then reduce the transverse direction of lens array (2) optical center position
Deviation.
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| CN201910541118.8A CN110262048B (en) | 2017-05-18 | 2017-05-18 | Calibration method for lens array of integrated imaging light field display system |
| CN201710378464.XA CN107121786B (en) | 2017-05-18 | 2017-05-18 | The calibration method of integration imaging light field display system lens array |
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| CN108021346A (en) * | 2017-12-26 | 2018-05-11 | 歌尔科技有限公司 | VR helmets show method, VR helmets and the system of image |
| CN110297333B (en) * | 2019-07-08 | 2022-01-18 | 中国人民解放军陆军装甲兵学院 | Light field display system adjusting method and system |
| CN110708532B (en) * | 2019-10-16 | 2021-03-23 | 中国人民解放军陆军装甲兵学院 | Universal light field unit image generation method and system |
| CN111193921B (en) * | 2020-01-10 | 2021-07-30 | 吉林大学 | LED screen one-dimensional integrated imaging display method based on combined discrete grating |
| CN111752003A (en) * | 2020-07-29 | 2020-10-09 | 中国人民解放军陆军装甲兵学院 | Integrated imaging three-dimensional display system |
| CN111953970B (en) * | 2020-08-28 | 2022-02-22 | 中国人民解放军陆军装甲兵学院 | Method and system for measuring positions of unit lenses of integrated imaging three-dimensional display system |
| CN112019830B (en) * | 2020-09-02 | 2022-02-22 | 中国人民解放军陆军装甲兵学院 | Element image correction method and system of integrated imaging three-dimensional display system |
| CN112887700B (en) * | 2021-01-12 | 2022-12-02 | 中国人民解放军陆军装甲兵学院 | Two-dimensional method for lateral position error of unit lens and lens array |
| CN113654458B (en) * | 2021-01-21 | 2024-05-28 | 中国人民解放军陆军装甲兵学院 | Transverse position error three-dimensional measurement method and system for lens array |
| CN114136591B (en) * | 2021-11-26 | 2023-09-08 | 广东工业大学 | Method and system for evaluating ultra-precise machining errors of micro lens array |
| CN117956128A (en) * | 2024-02-01 | 2024-04-30 | 四川大学 | Method for measuring and correcting axial position error of lens array in integrated imaging system |
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| US7993016B2 (en) * | 2009-04-03 | 2011-08-09 | Seiko Epson Corporation | Retro-reflective light diffusing display systems |
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| CN105025284B (en) * | 2014-04-18 | 2019-02-05 | 北京三星通信技术研究有限公司 | Demarcate the method and apparatus that integration imaging shows the display error of equipment |
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| CN102540489A (en) * | 2012-03-23 | 2012-07-04 | 浙江大学 | Aperture adjustable three-dimensional displaying device and method thereof |
| CN102692805A (en) * | 2012-05-31 | 2012-09-26 | 浙江大学 | Multilayer liquid crystal-based projection type three-dimensional display device and method |
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| CN107121786A (en) | 2017-09-01 |
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