CN107101808A - Method, device and the virtual reality helmet of lens back focal length are determined using camera - Google Patents
Method, device and the virtual reality helmet of lens back focal length are determined using camera Download PDFInfo
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- CN107101808A CN107101808A CN201710500963.1A CN201710500963A CN107101808A CN 107101808 A CN107101808 A CN 107101808A CN 201710500963 A CN201710500963 A CN 201710500963A CN 107101808 A CN107101808 A CN 107101808A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
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Abstract
The invention discloses method, device and the virtual reality helmet that a kind of use camera determines lens back focal length, this method includes：The position of regulation camera and display screen is so that lens are located between camera and display screen and make the optical axis of the camera lens optical axis of camera and the normal parallel of display screen, the camera lens of camera and lens conllinear；Obtain calibrated focal length during the theoretical virtual image of camera capture lens generation；Display screen is adjusted to the distance of lens, while the virtual image of the display screen generated by camera to lens is shot, and the photo for recording the distance between display screen and rear surface of lens and being shot with this apart from corresponding camera；Determine the distance between rear surface of display screen and lens corresponding to definition highest photo, the as back focal length of lens.It is arranged such, the use camera that the present invention is provided determines the method and device of lens back focal length, and it can accurately and accurately detect the back focal length of VR lens.
Description
Technical field
The present invention relates to optical technical field, the side of lens back focal length is determined more specifically to a kind of use camera
Method, device and virtual reality helmet.
Background technology
With the development of micro display technology, software and hardware technology and optical design process technology, VR (Virtual Reality,
Virtual reality) technology and industry be also further ripe.In the prior art, VR is often (saturating using the lens of a diameter of 30~60mm bores
Mirror) as magnifying glass, the image on display screen is projected in human eye.
Image on display screen is by lens projects into human eye, and the actual back focal length of lens is to influence eye-observation to figure
How the major influence factors of image sharpness, therefore, high efficiency and accurately detect out the back focal length of lens, as this area
Technical staff's important technological problems to be solved.
The content of the invention
It is an object of the invention to provide the method and device that a kind of use camera determines lens back focal length, it can be high
Imitate, accurately detect out the back focal length of VR lens.The present invention also aims to provide a kind of virtual reality helmet.
The method that a kind of use camera that the present invention is provided determines lens back focal length, methods described is applied to lens module,
The lens module includes lens and display screen；Methods described includes：
Adjust the position of the camera and the display screen so that the lens be located at the camera and the display screen it
Between and make the light of the camera lens optical axis of the camera and the normal parallel of the display screen, the camera lens of the camera and the lens
Axle is conllinear；
Obtain the calibrated focal length when camera shoots the theoretical virtual image of the lens generation；
The display screen is adjusted to the distance of the lens, at the same by the camera lens are generated it is described aobvious
The virtual image of display screen is shot, and record the distance between the display screen and rear surface of the lens and with this apart from right
The photo that the camera answered is shot；
The distance between rear surface of the display screen and the lens corresponding to definition highest photo is determined, i.e.,
For the back focal length of the lens.
Preferably, the calibrated focal length when camera shoots the theoretical virtual image of the lens generation, including step are determined：
Determine the theoretical virtual image position of the lens generation；
Adjust the focal distance of the camera and shoot the test board for being located at the theoretical virtual image position, record the phase
The focal distance of machine and corresponding test board photo；
The focal distance of the camera corresponding to definition highest test board photo is determined, as described camera is shot
Calibrated focal length during the theoretical virtual image of the lens generation.
Preferably, the display screen is arranged within one times of focal length of the lens.
Present invention also offers the device that a kind of use camera determines lens back focal length, described device is applied to lens mould
Group, the lens module includes lens and display screen；
Described device also includes the moving control mechanism for being used to control the display screen movement；
The camera and the display screen are located at the front and rear sides of lens respectively, and make camera lens optical axis and the institute of the camera
Normal parallel, the camera lens of the camera for stating display screen are conllinear with the optical axis of the lens；
The calibrated focal length of the camera is the focal length when camera shoots the theoretical virtual image of the lens generation.
Preferably, in addition to for the test board for the calibrated focal length for aiding in determining the camera.
Preferably, the display screen is arranged within one times of focal length of the lens.
Present invention also offers a kind of virtual reality helmet, including at least one lens module, the lens module
Including lens and display screen, the display location is in the preset range of back focal length for being arranged at the lens, wherein described
The back focal length of mirror is determined using the method described in any of the above-described.
Preferably, the display screen is arranged in the back focal length of the lens.
Preferably, pad is provided between the display screen and the lens, the display screen is arranged at the lens
In back focal length.
Preferably, the virtual reality helmet includes the first lens module and the second lens module, and described first is saturating
Mirror module, which includes the first lens and the first display screen, the second lens module, includes the second lens and second display screen；It is described
First lens are identical with second lens and positioned at same horizontal line, and first display screen is identical with the second display screen
And positioned at same horizontal line.
In the technical scheme that the present invention is provided, first, regulation camera and display screen position, so that lens be located at camera and
Between display screen, and make the optical axis of the camera lens optical axis of camera and the normal parallel of display screen, the camera lens of camera and lens conllinear, this
Sample, the approximately parallel light of the light that display screen is sent outgoing after lens transmission, camera can photograph normal amplification
The virtual image.
Then, calibrated focal length during the theoretical virtual image of camera capture lens generation is obtained, the theoretical virtual image refers to display screen
When being placed on the theoretical back focal length position of lens, the position for the virtual image that can be generated is theoretical virtual image position.
Then, the display screen is adjusted to the distance of the lens, and the void for the display screen that lens are generated by camera
As being shot, and the photograph for recording the distance between display screen and rear surface of lens and being shot with this apart from corresponding camera
Piece, such as, when display screen often moves 0.001 millimeter forward or backward, once shot by camera to the virtual image.
Finally, the distance between rear surface of display screen and lens corresponding to definition highest photo is determined, is
The back focal length of lens.It should be noted that camera shoots multiple pictures, when determining definition highest photo, each need to be contrasted
The definition of photo, and then definition highest photo can be determined, such as, (it can be adjusted by contrasting the MTF of each photo
Modulation trnasfer function) clear photograph the most is determined, certainly, also other the technology of image definition can be reflected by contrasting
Parameter is determined, and is no longer introduced one by one herein.
In this way, the method provided according to the present invention, can quickly and accurately detect VR lens back focal length.
Present invention also offers the device that a kind of use camera determines lens back focal length, the device can realize above-mentioned use
The method that camera determines lens back focal length.In addition, present invention also offers a kind of virtual reality helmet, rear Jiao of its lens
Away from using above method determination.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 be the embodiment of the present invention in using camera determine lens back focal length device schematic diagram；
Fig. 2 is the relation schematic diagram of the distance between display screen and lens with image definition；
Fig. 3 is camera focus and image definition relation schematic diagram.
In Fig. 1：
Camera -11, lens -12, display screen -13.
Embodiment
It is an object of the invention to provide the method and device that a kind of use camera determines lens back focal length, it can be high
Imitate, accurately detect out the back focal length of VR lens.
Hereinafter, embodiment is illustrated referring to the drawings.In addition, embodiments illustrated below is not to described in claim
The content of the invention rise any restriction effect.In addition, the full content of the composition represented by example below is not limited to as right
It is required that necessary to the solution of described invention.
In order to make it easy to understand, refer to Fig. 1, the method that the use camera that the present embodiment is provided determines lens back focal length is first
First, the position of regulation camera 11 and display screen 13, be located at the front and rear sides of lens 12 respectively, and make the camera lens optical axis of camera 11 with
The optical axis of the normal parallel of display screen 13, the camera lens of camera 11 and lens 12 is conllinear, so, and the light that display screen 13 is sent passes through
The approximately parallel light of outgoing after lens 12 are transmitted, camera 11 can photograph the virtual image of the display screen of lens generation.
Then, calibrated focal length during the theoretical virtual image of the capture lens 12 of camera 11 generation is obtained, the theoretical virtual image refers to show
When display screen 13 is placed on the theoretical back focal length position of lens 12, the position for the virtual image that can be generated is theoretical virtual image position.
Then, display screen 13 is moved forward and backward along normal direction, to adjust display screen to the distance of lens, and passes through camera 11
The virtual image that lens 12 are generated is shot, and record the distance between rear surface of display screen 13 and lens 12 and with this away from
The photo shot from corresponding camera 11, such as, when display screen 13 often moves 0.001 millimeter forward or backward, pass through camera
11 pairs of virtual images are once shot.
Finally, the distance between display screen 13 corresponding to definition highest photo and lens are determined, as lens
Back focal length, as shown in Fig. 2 Fig. 2 is the relation schematic diagram of the distance between display screen and lens with image definition.
In this way, the method provided according to the present invention, can quickly and accurately detect VR lens back focal length.
It should be noted that above-mentioned test process is focused in the theoretical virtual image distance of Lens Design to be tested based on camera 11
Place, and need to carry out calibration processing to camera 11 before this.Specifically, a testing standard plate is positioned over theoretical virtual image distance first
Place, then controls camera 11 to focus testing standard plate, obtains the relation of focal length and definition, finds definition peak
Calibrated focal length during the theoretical virtual image of corresponding focal length value, as camera capture lens generation, as shown in figure 3, Fig. 3 is that camera is burnt
Away from image definition relation schematic diagram.
In addition, in the present embodiment, in order to improve testing efficiency, the initial position of display screen 13 is arranged at one times of lens 12
Within focal length, i.e., display screen 13 is apart from lens 12, in this way, back focal length of the initial position of display screen 13 close to lens 12
Put, can rapidly test the back focal length of lens 12.
Further, in the present embodiment, when moving forward and backward display screen 13 along normal direction, display screen 13 shows RGB figures
Picture, the virtual image is away from corresponding wavelength size when can specifically combine the design of lens 12.
In addition, in the present embodiment, display screen 13 can be driven by stepper motor and be moved.Stepper motor can be controlled accurately
The movement of display screen 13 processed, and then the back focal length of lens can be accurately detected out.
The present embodiment additionally provides the device that a kind of use camera determines lens back focal length, including camera 11, display screen 13
With the moving control mechanism moved for control display screen 13；
Camera 11 and display screen 13 are located at the front and rear sides of lens 12 respectively, and make the camera lens optical axis and display screen of camera 11
The optical axis of 13 normal parallel, the camera lens of camera 11 and lens 12 is conllinear；
The focal length when calibrated focal length of camera 11 is the theoretical virtual image of the capture lens 12 of camera 11 generation.
It is arranged such, the use camera that the present embodiment is provided determines the device of lens back focal length, can realize above-mentioned use
The method that camera determines lens back focal length, therefore, the use camera that the present embodiment is provided determine the device of lens back focal length, can
Accurately and accurately detect the back focal length of VR lens.
Equally, similar with above-mentioned detection method, the present embodiment can also include being used to aid in the demarcation for determining camera 11 burnt
Away from test board, the application method of test board is identical with the application method of the test board in above-mentioned method of testing.
Test for convenience in different lens, the present embodiment, the bearing fixture for being used to carry lens 12 can also be included,
To change different lens 12.
Below, the present embodiment will combine specific data, and this programme is described in detail.
In the present embodiment, if the effective focal length design load of lens is 42mm, the virtual image is the corresponding lens of 1.5M away from design load
Afterwards surface to the distance between display screen 13 be 40.55mm.The effective focal length of the camera 11 of selected test system is 160mm,
F#3.5,3 μm of Pixel Dimensions allow that disperse circular diameter takes 6 μm, adjust camera focal distance 1.5m, can calculate the camera depth of field
Scope is 1498mm-1502mm.According to object-image relation as object distance change ± 0.005mm, the virtual image can be caused away from changing about 6mm,
The precision of camera 11 is enough to identify the variable quantity.
Same lens are detected by the above-mentioned test system, the corresponding image definition of each stepping position is obtained
Information.It is as shown in the table：
According to the above results, then the stepping position of stepper motor and the functional relation of definition, the maximum of definition are obtained
It is then optimum state to be worth corresponding Step.Now the measurement calibration information of binding test system, then can directly read measured lens
Back focal length numerical value.The step motion control precision of the precision of the test system and display screen 13, the camera 11 of test system are relevant.
In the parameter of camera 11 that the present embodiment is referred to, when the precision of step motion control reaches ± 0.005mm precision, the essence of the test system
Spend about 0.01mm.
The present embodiment additionally provides a kind of virtual reality helmet, including at least one lens module, lens module bag
Lens and display screen are included, display location is in the preset range of back focal length for being arranged at lens, and wherein the back focal length of lens is used
Method in above-described embodiment is determined.
Further, display screen is just arranged in the back focal length of lens, is arranged such, and can reach preferable vision effect
Really.The distance between display screen and lens are adjusted for convenience, pad are provided between display screen and lens, display screen is arranged at
In the back focal length of lens.So, can be real by the thickness of adjust pad when needing regulation the distance between display screen and lens
The distance regulation of existing display screen and lens.
In the present embodiment, virtual reality helmet can include the first lens module and the second lens module, and first is saturating
Mirror module, which includes the first lens and the first display screen, the second lens module, includes the second lens and second display screen.
Wherein, the first lens and the second lens are identical and positioned at same horizontal line, the first display screen and second display screen phase
With and positioned at same horizontal line.It is arranged such, the stereo display effect of virtual reality helmet can be realized.
Progressive mode is used to carry out this programme above for example, the scheme in each above-mentioned embodiment can be only
Vertical technical scheme can be also overlapped mutually.The foregoing description of the disclosed embodiments, makes professional and technical personnel in the field
It can realize or using the present invention.To be for those skilled in the art to a variety of modifications of these embodiments it is aobvious and
It is clear to, generic principles defined herein can without departing from the spirit or scope of the present invention, in other realities
Apply in example and realize.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to public with institute herein
The principle the opened most wide scope consistent with features of novelty.
Claims (10)
1. a kind of method that use camera determines lens back focal length, it is characterised in that methods described is applied to lens module, described
Lens module includes lens and display screen；Methods described includes：
Adjust the position of the camera and the display screen so that the lens be located between the camera and the display screen and
It is total to the optical axis of the camera lens optical axis of the camera and the normal parallel of the display screen, the camera lens of the camera and the lens
Line；
Obtain the calibrated focal length when camera shoots the theoretical virtual image of the lens generation；
The display screen is adjusted to the distance of the lens, while the display screen generated by the camera to the lens
The virtual image shot, and record the distance between the display screen and rear surface of the lens and with this apart from corresponding
The photo that the camera is shot；
Determine the distance between rear surface of the display screen and the lens corresponding to definition highest photo, as institute
State the back focal length of lens.
2. the method as described in claim 1, it is characterised in that determine that the camera shoots the theoretical virtual image of the lens generation
When calibrated focal length, including step：
Determine the theoretical virtual image position of the lens generation；
Adjust the focal distance of the camera and shoot the test board for being located at the theoretical virtual image position, record the camera
Focal distance and corresponding test board photo；
The focal distance of the camera corresponding to definition highest test board photo is determined, as described camera shoots described
Calibrated focal length during the theoretical virtual image of lens generation.
3. the method as described in claim 1, it is characterised in that the display screen be arranged at one times of focal length of the lens with
It is interior.
4. a kind of use camera determines the device of lens back focal length, it is characterised in that described device is applied to lens module, described
Lens module includes lens and display screen；
Described device also includes the moving control mechanism for being used to control the display screen movement；
The camera and the display screen are located at the front and rear sides of lens respectively, and the camera lens optical axis of the camera is shown with described
The normal parallel of display screen, the camera lens of the camera are conllinear with the optical axis of the lens；
The calibrated focal length of the camera is the focal length when camera shoots the theoretical virtual image of the lens generation.
5. the device of lens back focal length is determined using camera as claimed in claim 4, it is characterised in that also including for aiding in
Determine the test board of the calibrated focal length of the camera.
6. the device of lens back focal length is determined using camera as claimed in claim 5, it is characterised in that the display screen is set
Within one times of focal length of the lens.
7. a kind of virtual reality helmet, it is characterised in that including at least one lens module, the lens module includes saturating
Mirror and display screen, the display location is in the preset range of back focal length for being arranged at the lens, wherein after the lens
Focal length is determined using the method described in the claims any one of 1-3.
8. virtual reality helmet according to claim 7, it is characterised in that the display screen is arranged at the lens
Back focal length on.
9. virtual reality helmet according to claim 7, it is characterised in that between the display screen and the lens
Pad is provided with, the display screen is arranged in the back focal length of the lens.
10. the virtual reality helmet according to claim any one of 7-9, it is characterised in that the virtual reality head
Wearing equipment includes the first lens module and the second lens module, and the first lens module includes the first lens and the first display
Screen, the second lens module include the second lens and second display screen；First lens it is identical with second lens and
Positioned at same horizontal line, first display screen is identical with the second display screen and positioned at same horizontal line.
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| CN201710500963.1A CN107101808B (en) | 2017-06-27 | 2017-06-27 | Method and device for determining lens back focal length by adopting camera and virtual reality headset |
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|---|---|---|---|
| CN201710500963.1A CN107101808B (en) | 2017-06-27 | 2017-06-27 | Method and device for determining lens back focal length by adopting camera and virtual reality headset |
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| CN108362479A (en) * | 2018-02-09 | 2018-08-03 | 京东方科技集团股份有限公司 | A kind of determination method of virtual image image distance measuring system and virtual image image distance |
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| CN108982067A (en) * | 2018-08-01 | 2018-12-11 | 张家港康得新光电材料有限公司 | A kind of detection device and method of 3D head-up-display system |
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| CN111556973A (en) * | 2018-01-05 | 2020-08-18 | 华为技术有限公司 | Device and method for measuring mirror screen distance of VR display device |
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| CN108012146A (en) * | 2017-12-15 | 2018-05-08 | 歌尔科技有限公司 | Virtual image distance detection method and equipment |
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| CN108287397A (en) * | 2018-01-15 | 2018-07-17 | 歌尔股份有限公司 | Wear the axis calibrating method of display equipment |
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| CN109031688A (en) * | 2018-06-11 | 2018-12-18 | 歌尔股份有限公司 | The localization method and positioning device of display screen in a kind of optics module |
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| CN109752168A (en) * | 2019-01-03 | 2019-05-14 | 深圳市亿境虚拟现实技术有限公司 | A kind of optical mirror slip detection device for virtual reality device |
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| CN111179815A (en) * | 2020-01-07 | 2020-05-19 | 长春希达电子技术有限公司 | Method for collecting and correcting normal brightness and chromaticity of LED display module |
| CN111179815B (en) * | 2020-01-07 | 2022-10-25 | 长春希达电子技术有限公司 | Method for collecting and correcting normal brightness and chromaticity of LED display module |
| CN113137924A (en) * | 2020-01-17 | 2021-07-20 | 宁波舜宇车载光学技术有限公司 | Optical test system and method thereof |
| CN113137924B (en) * | 2020-01-17 | 2023-09-05 | 宁波舜宇车载光学技术有限公司 | Optical test system and method thereof |
| CN111694158A (en) * | 2020-06-17 | 2020-09-22 | Oppo广东移动通信有限公司 | Calibration method, calibration equipment and calibration system for near-eye display device |
| CN111986269A (en) * | 2020-08-25 | 2020-11-24 | Oppo广东移动通信有限公司 | Virtual image distance control method, device and system and electronic equipment |
| CN114554190A (en) * | 2022-02-25 | 2022-05-27 | 歌尔股份有限公司 | Lens testing device and lens testing method |
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