CN106127714B - A kind of measurement method of virtual reality head-mounted display equipment distortion parameter - Google Patents
A kind of measurement method of virtual reality head-mounted display equipment distortion parameter Download PDFInfo
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Abstract
The present invention discloses a kind of measurement method of virtual reality head-mounted display equipment distortion parameter, and party's decree screen exports the Prototype drawing for having coordinate system, replaces human eye to capture the virtual image using camera；First the image that camera takes is corrected the distortion of camera itself by photo processing software, extracts corresponding coordinate again later；By the coordinate position on sampling original template figure and the coordinate position by distorting after lens imaging, a certain monochromatic distortion parameter is solved；It allows screen to be sequentially output the coordinate Prototype drawing of tri- kinds of colors of R, G, B, repeats above step, obtain each distortion parameter of R, G, B.The present invention sets about from the VR aobvious actual imaging contexts of equipment, human eye is replaced and simulated by camera captures image, avoid the debugging repeatedly to parameter, developer does not need the basis in terms of optical design yet simultaneously, therefore no matter reliability or operation complexity, the method for distortion parameter is determined before being superior to by theoretical modeling.
Description
Technical field
The present invention relates to technical field of virtual reality, specifically a kind of virtual reality head-mounted display equipment distortion parameter
Measurement method.
Background technique
For VR aobvious equipment due to finite volume, the position of screen distance human eye is close, therefore generalling use optical lens will
Screen imaging is within the scope of the photopic vision of human eye, and due to the introducing of optical lens structure, intrinsic image defects, that is, aberration can be given
Equipment belt carrys out the decline of Experience Degree, wherein distortion has received widespread attention with dispersion as more apparent two big defect, it is abnormal
Change be due to line magnifying power of the lens to the object point away from optical axis different distance it is different caused by, so as to cause picture shape relative to
Caused by deformation occurs for object, this is a kind of monochromatic aberration, and dispersion is then different to the optical index of different wave length due to lens,
Since screen only exports tri- kinds of monochromatic light of RGB, so the difference that in fact dispersion distorts in the case of only needing to consider tri- kinds of RGB,
A kind of repair mode main at present is exactly by carrying out the anti-distortion algorithm process of RGB respectively to output image, to compensate
The corresponding aberration of lens itself so that final output image achieve the effect that as far as possible it is original under normal circumstances, therefore, how
It is most important that the distortion parameter of VR aobvious equipment of acquisition repairs image deflects for the method corrected by algorithm.
Currently, the method for being generally used to obtain VR aobvious equipment distortion parameter is to utilize optical design software (such as ZEMAX)
Theoretically lens model is modeled, simulates the distortion situation of lens imaging, so that corresponding anti-distortion algorithm is pushed over out,
But the presence of the location tolerance due to the manufacture of lens and mold not can be carried out perfection only by the parameter theoretically provided
Amendment, may also carry out the further manual debugging of parameter later, this has undoubtedly aggravated workload significantly, on the other hand,
The lens of some VR aobvious equipment are provided by third-party optics manufacturer, and the detailed construction parameter of lens very may be used for trade secret
It can not provide, this brings difficulty to the modeling of developer theoretically.
Summary of the invention
It is considered for disadvantage mentioned above, the invention is intended to provide one kind, effective and easy method goes to obtain VR head
The distortion parameter of aobvious equipment.
Technical solution: a kind of measurement method of virtual reality head-mounted display equipment distortion parameter, party's decree screen are defeated
The Prototype drawing for providing standby coordinate system replaces human eye to capture the virtual image using camera；The image that first camera is taken passes through photograph
Piece processing software is corrected the distortion of camera itself, extracts corresponding coordinate again later；By on sampling original template figure
Coordinate position and the coordinate position by distorting after lens imaging, solve a certain monochromatic distortion parameter；Allow screen
(1) it is sequentially output the coordinate Prototype drawing of tri- kinds of colors of R, G, B, above step is repeated, each distortion parameter of R, G, B can be obtained.
In a preferred embodiment, before camera replaces human eye to capture the virtual image, to the size and screen of screen
Curtain and lens distance are according to VR aobvious device parameter progress corresponding configuration step.
In another preferred embodiment, before camera replaces human eye to capture the virtual image, complete VR mold is used
Simulate VR aobvious equipment.
Preferably, camera further includes camera lens, camera lens diaphragm, keeps camera lens diaphragm at a distance from lens and distance of exit pupil one
It causes, the case where to simulate human eye.
Preferably, camera lens is wide-angle lens or bugeye lens.
In the first embodiment: when the optical axis of lens and the obvious out of plumb of screen, i.e. the optical axis and screen of lens
The angle of normal is greater than 5 °；Described its coordinate system of the Prototype drawing for having coordinate system is selected as rectangular coordinate system, has just in Prototype drawing
Square grid trrellis diagram.
More specifically, grid is the square of 6x 6mm.
Preferably, distortion parameter is solved method particularly includes:
K1, K2, K3, P1, P2 are distortion parameter, meet following relationship:
Wherein xu、yuIndicate the coordinate position on original template figure, xd、ydIndicate the coordinate by distorting after lens imaging
Position is obtained by sampling；By sample bring into solution obtain distortion parameter K1, K2, K3, P1,
P2。
In the second embodiment: when the optical axis of lens is obviously vertical with screen, i.e. the optical axis and screen method of lens
The angle of line is less than or equal to 5 °；Described its coordinate system of the Prototype drawing for having coordinate system is selected as polar coordinate system, has in Prototype drawing more
A concentric circles, unit radius 4mm.
Preferably, distortion parameter is solved method particularly includes:
K1, K2, K3 are distortion parameter, meet following relationship:
Whereinxu、yuIndicate the coordinate position on original template figure, xd、ydIt indicates
By the coordinate position to distort after lens imaging, obtained by sampling；It brings sample into solution and obtains distortion parameter
K1、K2、K3。
Beneficial effects of the present invention
1) virtual image is captured using at the photographic optical system of real image, to realize the parameter calibration to the virtual image.With lead to before
The method that theoretical modeling is crossed to determine distortion parameter compares, and the present invention sets about from the VR aobvious actual imaging contexts of equipment, leads to
Camera is crossed to replace and simulate human eye and capture image, avoids the debugging repeatedly to parameter, while developer does not need yet
Basis in terms of optical design, thus no matter from reliability and operation complexity on for be superior to the former.
2) imaging of human eye is simulated by the setting of camera lens stop position and using wide-angle lens (or bugeye lens),
Visual effect is quantified, assessment is facilitated.
3) according to the relationship between the optical axis of lens and screen, the coordinate being suitable under different situations sampling and parameter are proposed
Fitting scheme: when the optical axis of lens out of plumb obvious with screen, radial distortion and tangential distortion two influences have been comprehensively considered
Factor；When the optical axis of lens is obviously vertical with screen, the influence factor of radial distortion is only considered.And according to different situations, mould
Plate figure takes different coordinate systems, and data calculation amount is greatly reduced under the premise of meeting computational accuracy.
4) after obtaining each distortion parameter of R, G, B based on method proposed by the present invention, pass through the processing of the anti-algorithm that distorts
The distortion and dispersion of output image are eliminated simultaneously.
Detailed description of the invention
Fig. 1 is the solution of the present invention schematic device.
Fig. 2 is in the first embodiment: described to have coordinate system when the optical axis of lens and the obvious out of plumb of screen
Prototype drawing (rectangular coordinate system).
Fig. 3 is in second of embodiment: when the optical axis of lens is obviously vertical with screen, the mould for having coordinate system
Plate figure (polar coordinate system).
Specific embodiment
Below with reference to embodiment, the invention will be further described, and but the scope of the present invention is not limited thereto:
Embodiment 1: in conjunction with Fig. 1, a kind of measurement method of virtual reality head-mounted display equipment distortion parameter, party's decree
Screen (1) exports the Prototype drawing for having coordinate system, replaces human eye to capture the virtual image using camera (4)；First camera (4) are shot
To image the distortion of camera (4) itself is corrected by photo processing software, extract corresponding coordinate again later；It is logical
Coordinate position on over-sampling original template figure and the coordinate position by lens (3) imaging distortion later, solve a certain monochrome
The distortion parameter of light；Screen (1) is allowed to be sequentially output the coordinate Prototype drawing of tri- kinds of colors of R, G, B, repeatedly above step, acquisition R, G,
Each distortion parameter of B.
This programme, which is utilized, captures the virtual image at the photographic optical system of real image, to realize the parameter calibration to the virtual image.Therewith
The preceding method that distortion parameter is determined by theoretical modeling compares, and this programme is from VR aobvious actual imaging contexts of equipment
Hand is replaced and is simulated human eye by camera (4) and capture image, avoids the debugging repeatedly to parameter, while developer
Do not need the basis in terms of optical design yet, thus no matter from reliability and operation complexity for be superior to the former.
In some embodiments, before camera (4) replace human eye to capture the virtual image, to the size and screen of screen (1)
(1) corresponding configuration step is carried out according to VR aobvious device parameter with lens (3) distance.
In other embodiments, before camera (4) replace human eye to capture the virtual image, VR is simulated using complete VR mold
Aobvious equipment.
Embodiment 2: in conjunction with Fig. 1, a kind of survey of virtual reality head-mounted display equipment distortion parameter as described in Example 1
Amount method, camera (4) further include camera lens (5), camera lens diaphragm (6), keep camera lens diaphragm (6) at a distance from lens (3) and go out
Interpupillary distance is from consistent, the case where to simulate human eye.
Embodiment 3: a kind of measurement method of virtual reality head-mounted display equipment distortion parameter as described in Example 2,
Camera lens (5) is wide-angle lens or bugeye lens.
This programme simulates human eye by the setting of camera lens stop position and using wide-angle lens (or bugeye lens)
Imaging, visual effect is quantified, assessment is facilitated.
Embodiment 4: a kind of measurement method of virtual reality head-mounted display equipment distortion parameter as described in Example 1,
When the optical axis of lens (3) and screen (1) obvious out of plumb, i.e. the optical axis of lens (3) and the angle of screen (1) normal is greater than
5°；Described its coordinate system of the Prototype drawing for having coordinate system is selected as rectangular coordinate system, has square net figure in Prototype drawing.
Embodiment 5: in conjunction with Fig. 2, a kind of survey of virtual reality head-mounted display equipment distortion parameter as described in Example 6
Amount method, here by taking 5.5 cun of screens of 16:9 as an example, grid is the square of 6x 6mm.The numerical value is reference value, central water chestnut
The center in shape region is the central point, that is, optical axis of screen (1) side and the intersection point of screen, and sample coordinate is all grid vertexes, net
Lattice are more intensive, and sample coordinate is more, then fitting precision is higher, can adjust accordingly according to the difference that fitting precision requires.
A kind of embodiment 6: the measurement side of virtual reality head-mounted display equipment distortion parameter as described in embodiment 4 or 5
Method solves distortion parameter method particularly includes:
K1, K2, K3, P1, P2 are distortion parameter, meet following relationship:
Wherein xu、yuIndicate the coordinate position on original template figure, xd、ydIndicate the seat to distort after lens (3) imaging
Cursor position is obtained by sampling；By sample bring into solution obtain distortion parameter K1, K2, K3,
P1、P2。
Embodiment 7: a kind of measurement method of virtual reality head-mounted display equipment distortion parameter as described in Example 1,
When the optical axis of lens (3) is obvious vertical with screen (1), i.e. the optical axis of lens (3) and the angle of screen (1) normal is less than or equal to
5°；In conjunction with Fig. 3, described its coordinate system of the Prototype drawing for having coordinate system is selected as polar coordinate system, has multiple concentric circles in Prototype drawing,
Unit radius is 4mm, which is reference value, and sample coordinate is the radius of one group of concentric circles, using the number of coordinates of polar coordinate system
Amount greatly reduces compared to the coordinate quantity of rectangular coordinate system, but can satisfy required precision in most cases.
Embodiment 8: a kind of measurement method of virtual reality head-mounted display equipment distortion parameter as described in Example 9,
Solve distortion parameter method particularly includes:
K1, K2, K3 are distortion parameter, meet following relationship:
Whereinxu、yuIndicate the coordinate position on original template figure, xd、ydIt indicates
The coordinate position to distort after lens (3) imaging, is obtained by sampling；It brings sample into solution and obtains distortion ginseng
Number K1, K2, K3.
Scheme disclosed by the invention proposes to be suitable for not sympathizing with according to the relationship between the optical axis and screen (1) of lens (3)
Coordinate sampling and parameter fitting scheme under condition: when the optical axis of lens (3) and screen (1) obvious out of plumb, comprehensively consider
Two influence factors of radial distortion and tangential distortion；When the optical axis of lens (3) is obvious vertical with screen (1), only consider radial
The influence factor of distortion.And according to different situations, Prototype drawing takes different coordinate systems, big under the premise of meeting computational accuracy
Reduce data calculation amount greatly.
After obtaining each distortion parameter of R, G, B based on method proposed by the present invention, pass through the processing of the anti-algorithm that distorts, Ji Ketong
When eliminate output image distortion and dispersion.
Specific embodiment described herein is only to illustrate to spirit of that invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (10)
1. a kind of measurement method of virtual reality head-mounted display equipment distortion parameter, it is characterised in that party's decree screen (1)
Output has the Prototype drawing of coordinate system, replace human eye to capture the virtual image using camera (4): S1, first taking camera (4)
Image is corrected the distortion of camera (4) itself by photo processing software, extracts corresponding coordinate again later；S2, lead to
Coordinate position on over-sampling original template figure and the coordinate position by lens (3) imaging distortion later, solve a certain monochrome
The distortion parameter of light；S3, it allows screen (1) to be sequentially output the coordinate Prototype drawing of tri- kinds of colors of R, G, B, repeats step S1-S2, obtain
R, each distortion parameter of G, B.
2. a kind of measurement method of virtual reality head-mounted display equipment distortion parameter according to claim 1, feature
It is before camera (4) replace human eye to capture the virtual image, size and screen (1) and lens (3) distance to screen (1) are pressed
Corresponding configuration is carried out according to VR aobvious device parameter.
3. a kind of measurement method of virtual reality head-mounted display equipment distortion parameter according to claim 1, feature
It is before camera (4) replace human eye to capture the virtual image, simulates VR aobvious equipment using complete VR mold.
4. a kind of measurement method of virtual reality head-mounted display equipment distortion parameter according to claim 1, feature
Be that camera (4) further includes camera lens (5), camera lens diaphragm (6), keep camera lens diaphragm (6) at a distance from lens (3) and emergent pupil away from
From consistent, the case where to simulate human eye.
5. a kind of measurement method of virtual reality head-mounted display equipment distortion parameter according to claim 4, feature
It is that camera lens (5) are wide-angle lens or bugeye lens.
6. a kind of measurement method of virtual reality head-mounted display equipment distortion parameter according to claim 1, feature
It is that the i.e. optical axis of lens (3) and the angle of screen (1) normal is big when the optical axis of lens (3) and screen (1) obvious out of plumb
In 5 °；Described its coordinate system of the Prototype drawing for having coordinate system is selected as rectangular coordinate system, has square net figure in Prototype drawing.
7. a kind of measurement method of virtual reality head-mounted display equipment distortion parameter according to claim 6, feature
It is that its grid is the square of 6x 6mm.
8. a kind of measurement method of virtual reality head-mounted display equipment distortion parameter according to claim 6 or 7, special
Sign is to solve distortion parameter method particularly includes:
K1, K2, K3, P1, P2 are distortion parameter, meet following relationship:
Wherein xu、yuIndicate the coordinate position on original template figure, xd、ydIndicate the coordinate bit to distort after lens (3) imaging
It sets, is obtained by sampling；It brings sample into solution and obtains distortion parameter K1, K2, K3, P1, P2.
9. a kind of measurement method of virtual reality head-mounted display equipment distortion parameter according to claim 1, feature
It is that the i.e. optical axis of lens (3) and the angle of screen (1) normal is less than when the optical axis of lens (3) is obvious vertical with screen (1)
Equal to 5 °；Described its coordinate system of the Prototype drawing for having coordinate system is selected as polar coordinate system, has multiple concentric circles, unit in Prototype drawing
Radius is 4mm, and 4mm is reference value, and sample coordinate is the radius of one group of concentric circles.
10. a kind of measurement method of virtual reality head-mounted display equipment distortion parameter according to claim 9, feature
It is to solve distortion parameter method particularly includes:
K1, K2, K3 are distortion parameter, meet following relationship:
Whereinxu、yuIndicate the coordinate position on original template figure, xd、ydIt indicates to pass through
The coordinate position to distort after lens (3) imaging, is obtained by sampling；It brings sample into solution and obtains distortion parameter
K1、K2、K3。
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| CN105208370A (en) * | 2015-09-23 | 2015-12-30 | 北京暴风科技股份有限公司 | Display and calibration method of virtual-reality device |
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