CN107121786A - Integration imaging light field shows the calibration method of system lenses array - Google Patents
Integration imaging light field shows the calibration method of system lenses array Download PDFInfo
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- CN107121786A CN107121786A CN201710378464.XA CN201710378464A CN107121786A CN 107121786 A CN107121786 A CN 107121786A CN 201710378464 A CN201710378464 A CN 201710378464A CN 107121786 A CN107121786 A CN 107121786A
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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 display technology field based on integration imaging, and in particular to the calibration method of lens array in light field display system.Integration imaging light field shows that 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 of elimination lenslet array center position deviation, and its basic thought is：The line and directional diffuser screen of perfect lens photocentre position and respective display unit center have intersection point, as a reference point with this intersection point；Check plot picture is loaded in the central spot of perfect lens correspondence display unit, the image can be imaged after actual lens in directional diffuser screen；Further according to position deviation progress corresponding calibration process of the actual imaging position with reference point, to reduce or eliminate lenslet array center position deviation.
Description
Technical field
The invention belongs to the light field display technology field based on integration imaging, and in particular to lens array in light field display system
The calibration method of row.
Background technology
Integration imaging includes the record of three-dimensional scenic with reproducing two processes.In recording process, lens array and record are situated between
Matter (such as charge coupling device (CCD), complementary metal oxide semiconductor (CMOS) or film) emits beam to three-dimensional scenic
Directional information and monochrome information are sampled, and obtain each cell picture in two-dimensional cell pattern matrix, cell picture array
All be its corresponding lens to three-dimensional scenic into picture, the different parallax informations comprising 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), the light that cell picture is sent
3-D view is formed by being reconstructed after lens array or pinhole array.The record of integration imaging does not need coherent light with reproducing processes
Illumination, can be achieved the continuous parallax of bore hole, the Three-dimensional Display of RGB, in certain angular field of view, is available for many people in different directions
Watch simultaneously.The visible resolution of traditional integration imaging is limited by lens separation, for increase visible resolution, is built based on collection
Light field into imaging shows system：Directional diffuser screen is placed in a certain depth plane of reconstruct three-dimensional body, so that in diffuser screen
Front and rear one section of depth bounds in human eye can obtain higher visible resolution.
Ideally, the lensed center of institute and correspondence display unit center in integration imaging light field display system
The line of position should be parallel, and more precisely, they should be each perpendicular to display panel.But in actual conditions, thoroughly
The assembling process of lens array can have error, in the horizontal and vertical decline that can be produced skew, cause three-dimensionalreconstruction precision, imaging
The deterioration of quality, it is therefore desirable to calibrated to the position of each lens.The present invention is the lateral shift on lens position
Calibration method.
First technology " a kind of registering template of array image for lens array " (Chinese patent, application number：
CN103824288A), for there is error in lens array process the problem of, a kind of array image is disclosed with quasi-mode
Plate, but the template is complex.
The present invention proposes that integration imaging light field shows the calibration method of system lenses array, specifically includes a kind of reduction center
The method of position lateral deviation and a kind of method of elimination center lateral deviation.
The content of the invention
The purpose of the present invention is to propose to the calibration method that integration imaging light field shows system lenses array, it is ensured that each lens
Photocentre position and the center lateral registration of correspondence display unit, to improve the precision of three-dimensionalreconstruction, lifting imaging shows matter
Amount.
It is a feature of the present invention that integration imaging light field shows that system includes display panel, lens array and directional scattering
Corresponding cell picture array is loaded on screen, display panel, ideally, center and the respective lens photocentre of cell picture
Line should be parallel (i.e. lateral registration), and perpendicular to display panel；And under actual conditions, due to the assembling of lens array
There is error, horizontal skew can be produced, the center of each display unit is no longer parallel with the line of respective lens photocentre.If still
So corresponding cell picture is loaded according to the position of perfect lens, it will cause the decline of three-dimensionalreconstruction precision, image quality
Deteriorate.For situation above, the present invention proposes that a kind of reduction lenslet array center position deviation is eliminated in lens array with a kind of
The method of heart position deviation.
Use the present invention reduction center deviation method for：Each perfect lens photocentre and corresponding display unit center
Line has intersection point in directional diffuser screen, and these intersection points are marked and as reference point in directional diffuser screen, preferable saturating
The central spot loading check plot picture of mirror corresponding unit image, such as " ten " glyph image, image is acted on through actual lens, it will
Imaging can have deviation to directional diffuser screen between the center of imaging and before mark point.Now accurately controlled by program
The loading position of " ten " glyph image, the central point for making it be gradually deviated from perfect lens corresponding unit image, and the image is through reality
The reference point that imaging is gradually approached in directional diffuser screen after the lens of border, when both overlap, program stopped will now " ten " word
The loading position of shape image as actual lens photocentre lateral attitude.All lens are all done after aforesaid operations, lens array
The calibration of the lateral attitude at row center is completed, and the center of lens is the centre bit for the corresponding unit image that display panel is loaded
Put.By mathematical analysis, during 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 relevant.
Use the present invention eliminate center deviation method for：Image will be verified, such as " ten " glyph image, and load famous dictum
Think the center position of lens corresponding unit image, the image is acted on through actual lens, it will imaging is to directional diffuser screen, each reason
Think that optical center of lens and the line of corresponding unit picture centre have intersection point in directional diffuser screen, can accurately measure actual imaging
Position deviation between position and preferable intersection point, and then calculate the correction for obtaining actual lens corresponding unit image center location
Amount, completes the calibration of lens array.
Brief description of the drawings
Implement illustration：
The integration imaging light field that the present invention is provided shows that the accompanying drawing of the calibration method of system lenses array has 5
The position relationship schematic diagram of Fig. 1 ideally display panel, lens array and directional diffuser screen.
The position relationship schematic diagram of display panel, lens array and directional diffuser screen under Fig. 2 actual conditions.
Fig. 3 integration imagings light field shows the schematic diagram of the calibration method of system lenses array.
Front view after skew and lens array calibration of Fig. 4 " ten " font check plots as relative lens.
Fig. 5 is using the design sketch being implemented as after reduction center deviation calibration method as increased quality.
In Fig. 1~Fig. 3, (1)-display panel, (2)-lens array, (3)-directional diffuser screen.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention " is integrated into below in conjunction with accompanying drawing
The calibration method of picture light field display system lenses array " embodiment is described in further detail.
Fig. 1 is the position relationship schematic diagram of ideally display panel, lens array and directional diffuser screen.Display panel
(1) loading unit pattern matrix on, the center of each unit image is expressed as C1, C2, C3... placed immediately ahead of each display unit
One lens, composition lens array (2), the photocentre of each lens is expressed as O1, O2, O3... each display unit center with it is corresponding thoroughly
The line of mirror photocentre is R with the intersection point of directional diffuser screen (1)1, R2, R3... ideally, each unit picture centre and lens
The line of photocentre should be parallel, more precisely, they should be each perpendicular to display panel (1).
Fig. 2 is the position relationship schematic diagram of display panel, lens array and directional diffuser screen under actual conditions.Due to lens
There is error in the assembling process of array (2), lateral shift can be produced.At lens array (2) position, solid line represents preferable saturating
The position of mirror, dotted line represents the position of actual lens, and the photocentre of each perfect lens is expressed as O1, O2, O3... each actual lens
Photocentre is expressed as O '1, O '2, O '3... now, each display unit center is no longer parallel with the line of actual lens photocentre, if
Still according to the generation of perfect lens position and loading unit pattern matrix, it will cause the decline of three-dimensionalreconstruction precision, image quality
Deterioration.
Fig. 3 is the schematic diagram for the calibration method that integration imaging light field shows system lenses 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 represents the position of perfect lens, and its photocentre is designated as O points, CerrPoint represents perfect lens corresponding unit
The desired center position of image, CerrPoint is designated as R points with the line of O points and the intersection point of directional diffuser screen.Deposited during due to lens arrangement
In error, actual lens position can deviate the position of perfect lens, and dotted line frame represents the position of actual lens, and its photocentre is designated as
O ' points, CoptPoint represents the practical center position of actual lens corresponding unit image, CoptPut the line and directional scattering with O '
The intersection point of screen is designated as RoptPoint.If now will CerrPoint is used as the center of actual lens corresponding unit image, CerrPoint with
The line of O ' and the intersection point of directional diffuser screen are designated as RerrPoint, the point will much deviate correct image point position RoptPoint.
Center deviation is reduced using method one.According to the photocentre O points and corresponding units picture centre C of perfect lenserr
The position relationship of point, R points is marked 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 loading check plot picture, 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
Overlapped after middle the heart channel of Hang-Shaoyin actual lens imaging with the R points in directional diffuser screen, stop movement, now the loading 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 carried in CerrPlace, the picture point after actual lens is located at RerrPlace, this 2 points line
Angle with horizontal direction isAfter calibration, cell picture is carried in CcalPlace, the picture after actual lens
Point is at R, and this 2 points line and the angle of horizontal direction areM be lens into
As the multiplication 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.Check plot picture is loaded, such as " ten " glyph image is centrally located at it
CerrPlace, the picture point after actual lens is located at RerrPlace, accurate measurementValue, calculates correcting valueRoot
According to CerrPosition and correcting value find respective point Copt, the point is the lateral attitude of accurate lens centre.
Fig. 4 is the front view after skew and lens array calibration of " ten " the font check plot as relative lens.Fig. 4 (a) is
The front view that each " ten " font check plot is offset as relative lens before lens array calibration, " ten " glyph image is not arranged neatly
Row, deviation is larger, and Fig. 4 (b) is the front view after calibration, and each " ten " font check plot is as proper alignment.
Fig. 5 is using the design sketch being implemented as after reduction center deviation calibration method as increased quality.Fig. 5 (a) is
Integration imaging light field display effect before calibration, Fig. 5 (b) for calibration after integration imaging light field display effect, Fig. 5 (b) into
As quality more preferably, image is apparent,
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (3)
1. a kind of integration imaging light field shows the calibration method of system lenses array, it is characterised in that the integration imaging light field
Display system includes loading unit on display panel (1), lens array (2) and directional diffuser screen (3), the display panel (1)
Pattern matrix, each cell picture is corresponded with lens, and the photocentre of lens is overlapped with the central cross of cell picture.Unit
Pattern matrix reconstructs three-dimensional scenic after being projected through lens array (2), in order to improve the visible resolution of human eye viewing, in reconstruct
The a certain plane of three-dimensional scenic places directional diffuser screen (3), in one section of depth bounds, human eye is all before and after directional diffuser screen (3)
Higher visible resolution can be obtained.
2. a kind of integration imaging light field as claimed in claim 1 shows the calibration method of system lenses array, it is characterised in that
The general non-Precision Machining of lens array (2) makes, and lens therein have error in assembling process, and the spacing of lens is not fixed
Value, actual lens position can deviate perfect lens position, and the laterally inclined of lens array (2) photocentre position is reduced using following methods
Difference：
A. perfect lens photocentre has with the line at the center of corresponding units image on display panel (1) and directional diffuser screen (3)
Intersection point, marks that the point is as a reference point in directional diffuser screen (3), and all reference points have identical spacing；
B. check plot picture, the center of check plot picture and the center superposition of cell picture, image warp are loaded on display panel (1)
It can be imaged after actual lens in directional diffuser screen (3), there is deviation between the center of imaging and reference point, in order in orientation
Obtained on diffuser screen (3) clearly as directional diffuser screen (3) is located at lens image plane；
C. the loading position of check plot picture, the central point for making it be gradually deviated from perfect lens corresponding unit image, the image are adjusted
Middle the heart channel of Hang-Shaoyin actual lens after imaging can gradually approach corresponding reference point in directional diffuser screen (3)；
D. when check plot picture through actual lens imaging with reference point is overlapped in directional diffuser screen (3) when, will now check plot picture
Loading position as actual lens corresponding unit image central point, and then reduce lens array (2) photocentre position transverse direction
Deviation.
3. a kind of integration imaging light field as claimed in claim 1 shows the calibration method of system lenses array, it is characterised in that
There is error in the assembling process of lens array (2), actual lens position can deviate perfect lens position, disappear using following methods
Except the lateral deviation of lens array (2) center：
A. perfect lens photocentre has with the line at the center of corresponding units image on display panel (1) and directional diffuser screen (3)
Intersection point, marks that the point is as a reference point in directional diffuser screen (3), and all reference points have identical spacing；
B. check plot picture, the center of check plot picture and the center superposition of cell picture, image warp are loaded on display panel (1)
It can be imaged after actual lens in directional diffuser screen (3), there is deviation between the center of imaging and reference point, accurately measure this
One position deviation；
C. it is accurate according to the position relationship between display panel (1), lens array (2) and directional diffuser screen (3), and previous step
Obtained position deviation value is measured, the accurate deviation obtained between actual lens photocentre position and preferable photocentre position can be calculated
Value, and then eliminate the lateral deviation of lens array (2) photocentre position.
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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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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN110297333A (en) * | 2019-07-08 | 2019-10-01 | 中国人民解放军陆军装甲兵学院 | A kind of light field display system adjusting method and system |
| CN110708532A (en) * | 2019-10-16 | 2020-01-17 | 中国人民解放军陆军装甲兵学院 | Universal light field unit image generation method and system |
| CN111193921A (en) * | 2020-01-10 | 2020-05-22 | 吉林大学 | LED screen one-dimensional integrated imaging display method based on combined discrete grating |
| CN111953970A (en) * | 2020-08-28 | 2020-11-17 | 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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| CN110708532A (en) * | 2019-10-16 | 2020-01-17 | 中国人民解放军陆军装甲兵学院 | Universal light field unit image generation method and system |
| CN111193921A (en) * | 2020-01-10 | 2020-05-22 | 吉林大学 | LED screen one-dimensional integrated imaging display method based on combined discrete grating |
| CN111953970A (en) * | 2020-08-28 | 2020-11-17 | 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 |
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| CN112887700A (en) * | 2021-01-12 | 2021-06-01 | 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 |
| 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 |
Also Published As
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|---|---|
| CN110262048A (en) | 2019-09-20 |
| CN110262048B (en) | 2021-03-23 |
| CN107121786B (en) | 2019-07-19 |
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