CN107101808B - Method and device for determining lens back focal length by adopting camera and virtual reality headset - Google Patents
Method and device for determining lens back focal length by adopting camera and virtual reality headset Download PDFInfo
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- CN107101808B CN107101808B CN201710500963.1A CN201710500963A CN107101808B CN 107101808 B CN107101808 B CN 107101808B CN 201710500963 A CN201710500963 A CN 201710500963A CN 107101808 B CN107101808 B CN 107101808B
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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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Abstract
The invention discloses a method and a device for determining a lens back focal length by adopting a camera and virtual reality head-mounted equipment, wherein the method comprises the following steps: adjusting the positions of the camera and the display screen so that the lens is positioned between the camera and the display screen, the optical axis of the lens of the camera is parallel to the normal line of the display screen, and the optical axis of the lens of the camera is collinear with the optical axis of the lens; obtaining a calibration focal length when a camera shoots a theoretical virtual image generated by a lens; adjusting the distance between the display screen and the lens, shooting a virtual image of the display screen generated by the lens through the camera, and recording the distance between the display screen and the rear surface of the lens and the photo shot by the camera corresponding to the distance; and determining the distance between the display screen corresponding to the photo with the highest definition and the rear surface of the lens, namely the back focal length of the lens. By the arrangement, the method and the device for determining the back focal length of the lens by using the camera can efficiently and accurately detect the back focal length of the VR lens.
Description
Technical Field
The present invention relates to the field of optical technologies, and in particular, to a method and an apparatus for determining a back focal length of a lens by using a camera, and a virtual reality headset.
Background
With the development of micro-display technology, software and hardware technology, and optical design processing technology, VR (Virtual Reality) technology and industry are also becoming mature. In the prior art, VR often uses lenses with diameters of 30-60 mm as magnifiers to project images on a display screen into the human eye.
The image on the display screen is projected to the human eye through the lens, and the actual back focal length of the lens is a main influencing factor influencing the definition of the image observed by the human eye, so how to efficiently and accurately detect the back focal length of the lens becomes an important technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a method and a device for determining the back focal length of a lens by adopting a camera, which can efficiently and accurately detect the back focal length of a VR lens. The invention also aims to provide the virtual reality headset.
The invention provides a method for determining a back focal length of a lens by adopting a camera, which is applied to a lens module, wherein the lens module comprises a lens and a display screen; the method comprises the following steps:
adjusting the positions of the camera and the display screen so that the lens is positioned between the camera and the display screen, the optical axis of the lens of the camera is parallel to the normal of the display screen, and the optical axis of the lens of the camera is collinear with the optical axis of the lens;
obtaining a calibration focal length when the camera shoots a theoretical virtual image generated by the lens;
adjusting the distance between the display screen and the lens, shooting a virtual image of the display screen generated by the lens through the camera, and recording the distance between the display screen and the rear surface of the lens and a photo shot by the camera corresponding to the distance;
and determining the distance between the display screen corresponding to the photo with the highest definition and the rear surface of the lens, namely, the back focal length of the lens.
Preferably, determining the nominal focal length when the camera captures the theoretical virtual image generated by the lens comprises the steps of:
determining a theoretical virtual image position generated by the lens;
adjusting the focusing distance of the camera, shooting a test board positioned at the theoretical virtual image position, and recording the focusing distance of the camera and a corresponding test board photo;
and determining the focusing distance of the camera corresponding to the test board photo with the highest definition, namely, the calibration focal length when the camera shoots the theoretical virtual image generated by the lens.
Preferably, the display screen is disposed within a focal length of the lens.
The invention also provides a device for determining the back focal length of the lens by adopting the camera, which is applied to a lens module, wherein the lens module comprises a lens and a display screen;
the device also comprises a movement control mechanism for controlling the movement of the display screen;
the camera and the display screen are respectively positioned at the front side and the rear side of the lens, the optical axis of the lens of the camera is parallel to the normal line of the display screen, and the optical axis of the lens of the camera is collinear with the optical axis of the lens;
the calibrated focal length of the camera is the focal length when the camera shoots the theoretical virtual image generated by the lens.
Preferably, a test board is also included for assisting in determining the nominal focal length of the camera.
Preferably, the display screen is disposed within a focal length of the lens.
The invention also provides virtual reality head mounted equipment, which comprises at least one lens module, wherein the lens module comprises a lens and a display screen, the display screen is positioned in a preset range of a back focal length of the lens, and the back focal length of the lens is determined by adopting the method of any one of the above.
Preferably, the display screen is disposed on a back focal length of the lens.
Preferably, a gasket is arranged between the display screen and the lens, and the display screen is arranged on the back focal length of the lens.
Preferably, the virtual reality headset comprises a first lens module and a second lens module, wherein the first lens module comprises a first lens and a first display screen, and the second lens module comprises a second lens and a second display screen; the first lens and the second lens are the same and positioned on the same horizontal line, and the first display screen and the second display screen are the same and positioned on the same horizontal line.
In the technical scheme provided by the invention, firstly, the positions of the camera and the display screen are adjusted so that the lens is positioned between the camera and the display screen, the optical axis of the lens of the camera is parallel to the normal line of the display screen, and the optical axis of the lens of the camera is collinear with the optical axis of the lens, so that the light rays emitted by the display screen are transmitted by the lens and then are emitted to be approximately parallel, and the camera can shoot a normal amplified virtual image.
And then, obtaining a calibration focal length when the camera shoots a theoretical virtual image generated by the lens, wherein the theoretical virtual image refers to a position of the virtual image which can be generated when the display screen is placed at a theoretical back focal length position of the lens, and the position of the virtual image is the theoretical virtual image position.
And then, adjusting the distance between the display screen and the lens, shooting a virtual image of the display screen generated by the lens through the camera, and recording the distance between the display screen and the rear surface of the lens and the picture shot by the camera corresponding to the distance, for example, shooting the virtual image once through the camera when the display screen moves forwards or backwards by 0.001 millimeter each time.
And finally, determining the distance between the display screen corresponding to the photo with the highest definition and the rear surface of the lens, namely the back focal length of the lens. It should be noted that when the camera takes a plurality of pictures and determines the picture with the highest definition, the definition of each picture needs to be compared, so that the picture with the highest definition can be determined, for example, the most clear picture can be determined by comparing the MTF (modulation transfer function) of each picture, and of course, the picture can also be determined by comparing other technical parameters capable of reflecting the definition of the picture, which is not described one by one.
Thus, according to the method provided by the invention, the back focal length of the VR lens can be detected rapidly and accurately.
The invention also provides a device for determining the back focal length of the lens by adopting the camera, which can realize the method for determining the back focal length of the lens by adopting the camera. In addition, the invention also provides the virtual reality headset, and the back focal length of the lens of the virtual reality headset is determined by adopting the method.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an apparatus for determining a back focal length of a lens using a camera according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the relationship between the distance between the display screen and the lens and the clarity of the photo;
fig. 3 is a schematic diagram of the relationship between the focal length of the camera and the image definition.
In fig. 1:
camera-11, lens-12, display screen-13.
Detailed Description
The invention aims to provide a method and a device for determining the back focal length of a lens by adopting a camera, which can efficiently and accurately detect the back focal length of a VR lens.
Hereinafter, embodiments will be described with reference to the drawings. Furthermore, the embodiments shown below do not limit the summary of the invention described in the claims. The whole contents of the constitution shown in the following examples are not limited to the solution of the invention described in the claims.
For easy understanding, please refer to fig. 1, in the method for determining the back focal length of the lens by using the camera according to the present embodiment, first, the positions of the camera 11 and the display screen 13 are adjusted and respectively located at the front side and the rear side of the lens 12, and the optical axis of the lens 11 is parallel to the normal line of the display screen 13, and the lens of the camera 11 is collinear with the optical axis of the lens 12, so that the light emitted by the display screen 13 is transmitted by the lens 12 and then emits approximately parallel light, and the camera 11 can capture the virtual image of the display screen generated by the lens.
Then, a calibration focal length when the camera 11 captures a theoretical virtual image generated by the lens 12, which is a position of a virtual image that can be generated when the display screen 13 is placed at the theoretical back focal length position of the lens 12, is obtained, which is a theoretical virtual image position.
Then, the display 13 is moved back and forth in the normal direction to adjust the display-to-lens distance, and the virtual image generated by the lens 12 is photographed by the camera 11, and the distance between the display 13 and the rear surface of the lens 12 and the photograph taken by the camera 11 corresponding to the distance are recorded, for example, when the display 13 is moved forward or backward every 0.001 mm, the virtual image is photographed by the camera 11 once.
Finally, the distance between the display 13 and the lens corresponding to the photo with the highest definition is determined, namely the back focal length of the lens, as shown in fig. 2, and fig. 2 is a schematic diagram of the relationship between the distance between the display and the lens and the definition of the photo.
Thus, according to the method provided by the invention, the back focal length of the VR lens can be detected rapidly and accurately.
It should be noted that the above-mentioned testing process is based on focusing the camera 11 at the theoretical virtual image distance of the lens design to be tested, and the calibration process is required before the camera 11. Specifically, a test standard board is placed at the theoretical virtual image distance first, then the camera 11 is controlled to focus the test standard board to obtain the relationship between the focal length and the definition, and the focal length value corresponding to the highest point of the definition is found, namely the calibrated focal length when the camera shoots the theoretical virtual image generated by the lens, as shown in fig. 3, and fig. 3 is a schematic diagram of the relationship between the focal length of the camera and the definition of the image.
In addition, in the present embodiment, in order to improve the testing efficiency, the initial position of the display 13 is set within one focal length of the lens 12, that is, the display 13 is located away from the lens 12, so that the initial position of the display 13 is close to the back focal length of the lens 12, and the back focal length of the lens 12 can be quickly tested.
Further, in this embodiment, when the display screen 13 is moved back and forth along the normal direction, the display screen 13 displays RGB images, specifically, the size of the virtual image distance corresponding to the wavelength when the lens 12 is designed can be combined.
In addition, in this embodiment, the display 13 may be moved by a stepper motor. The stepper motor can precisely control the movement of the display 13 and thus can precisely detect the back focal length of the lens.
The embodiment also provides a device for determining the back focal length of a lens by adopting a camera, which comprises a camera 11, a display screen 13 and a movement control mechanism for controlling the movement of the display screen 13;
the camera 11 and the display screen 13 are respectively positioned on the front side and the rear side of the lens 12, and the optical axis of the lens of the camera 11 is parallel to the normal line of the display screen 13, and the lens of the camera 11 is collinear with the optical axis of the lens 12;
the nominal focal length of the camera 11 is the focal length at which the camera 11 takes a theoretical virtual image generated by the lens 12.
With such a configuration, the device for determining the back focal length of the lens by using the camera according to the present embodiment can implement the method for determining the back focal length of the lens by using the camera, so that the device for determining the back focal length of the lens by using the camera according to the present embodiment can efficiently and accurately detect the back focal length of the VR lens.
Also, similar to the above-described detection method, the present embodiment may further include a test board for assisting in determining the calibration focal length of the camera 11, and the method of using the test board is the same as that of the above-described test method.
To facilitate testing of different lenses, the present embodiment may further include a carrier jig for carrying the lenses 12 to replace the different lenses 12.
Next, this embodiment will be described in detail with reference to specific data.
In this embodiment, the effective focal length of the lens is 42mm, and the distance from the rear surface of the lens to the display screen 13 corresponding to the virtual image distance of 1.5M is 40.55mm. The effective focal length of the camera 11 of the selected test system is 160mm, F#3.5, the pixel size is 3 mu m, the diameter of the allowed circle of confusion is 6 mu m, the focusing distance of the camera is adjusted to 1.5m, and the depth of field of the camera can be calculated to be 1498mm-1502mm. When the object distance changes by ±0.005mm according to the object-image relationship, a change in the virtual image distance of about 6mm may be caused, and the accuracy of the camera 11 is sufficient to recognize the amount of change.
And detecting the same lens through the testing system to obtain the image definition information corresponding to each stepping position. The following table shows:
and according to the result, obtaining the function relation between the stepping position of the stepping motor and the definition, wherein Step corresponding to the maximum value of the definition is the optimal state. At this time, the back focal length of the lens to be tested can be directly read out by combining the measurement scale information of the test system. The accuracy of the test system is related to the stepping control accuracy of the display 13, the camera 11 of the test system. Among the parameters of the camera 11 mentioned in this embodiment, when the accuracy of the step control reaches ±0.005mm accuracy, the accuracy of the test system is about 0.01mm.
The embodiment also provides a virtual reality headset, which comprises at least one lens module, wherein the lens module comprises a lens and a display screen, and the display screen is positioned in a preset range of a back focal length of the lens, and the back focal length of the lens is determined by adopting the method in the embodiment.
Further, the display screen is arranged on the back focal length of the lens, and the display screen can achieve a better visual effect. In order to conveniently adjust the distance between the display screen and the lens, a gasket is arranged between the display screen and the lens, and the display screen is arranged on the back focal length of the lens. Thus, when the distance between the display screen and the lens needs to be adjusted, the distance between the display screen and the lens can be adjusted by adjusting the thickness of the gasket.
In this embodiment, the virtual reality headset may include a first lens module and a second lens module, where the first lens module includes a first lens and a first display screen, and the second lens module includes a second lens and a second display screen.
The first lens and the second lens are identical and positioned on the same horizontal line, and the first display screen and the second display screen are identical and positioned on the same horizontal line. By the arrangement, the stereoscopic display effect of the virtual reality headset can be achieved.
The above progressive mode is adopted to illustrate the scheme, and the schemes in the above embodiments can be independent technical schemes or can be mutually overlapped. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for determining a back focal length of a lens by using a camera, wherein the method is applied to a lens module, and the lens module comprises a lens and a display screen; the method comprises the following steps:
adjusting the positions of the camera and the display screen so that the lens is positioned between the camera and the display screen, the optical axis of the lens of the camera is parallel to the normal of the display screen, and the optical axis of the lens of the camera is collinear with the optical axis of the lens;
obtaining a calibration focal length when the camera shoots a theoretical virtual image generated by the lens;
adjusting the distance between the display screen and the lens, shooting a virtual image of the display screen generated by the lens through the camera, and recording the distance between the display screen and the rear surface of the lens and a photo shot by the camera corresponding to the distance;
and determining the distance between the display screen corresponding to the photo with the highest definition and the rear surface of the lens, namely, the back focal length of the lens.
2. The method of claim 1, wherein determining a nominal focal length at which the camera captures a theoretical virtual image generated by the lens comprises the steps of:
determining a theoretical virtual image position generated by the lens;
adjusting the focusing distance of the camera, shooting a test board positioned at the theoretical virtual image position, and recording the focusing distance of the camera and a corresponding test board photo;
and determining the focusing distance of the camera corresponding to the test board photo with the highest definition, namely, the calibration focal length when the camera shoots the theoretical virtual image generated by the lens.
3. The method of claim 1, wherein the display screen is disposed within a focal length of the lens.
4. An apparatus for determining a back focal length of a lens using a camera, wherein the apparatus is applied to a lens module including a lens and a display screen;
the device also comprises a movement control mechanism for controlling the movement of the display screen;
the camera and the display screen are respectively positioned at the front side and the rear side of the lens, the optical axis of the lens of the camera is parallel to the normal line of the display screen, and the optical axis of the lens of the camera is collinear with the optical axis of the lens;
the calibrated focal length of the camera is the focal length when the camera shoots the theoretical virtual image generated by the lens.
5. The apparatus for determining the back focal length of a lens using a camera of claim 4, further comprising a test plate for aiding in determining the nominal focal length of the camera.
6. The apparatus for determining the back focal length of a lens using a camera of claim 5 wherein said display screen is positioned within one focal length of said lens.
7. A virtual reality headset comprising at least one lens module, the lens module comprising a lens and a display screen, the display screen being located within a predetermined range of back focal lengths provided to the lens, wherein the back focal lengths of the lens are determined using the method of any of claims 1-3.
8. The virtual reality headset of claim 7, wherein the display screen is disposed on a back focal length of the lens.
9. The virtual reality headset of claim 7, wherein a spacer is disposed between the display screen and the lens, the display screen being disposed at a back focal length of the lens.
10. The virtual reality headset of any one of claims 7-9, wherein the virtual reality headset comprises a first lens module and a second lens module, the first lens module comprising a first lens and a first display screen, the second lens module comprising a second lens and a second display screen; the first lens and the second lens are the same and positioned on the same horizontal line, and the first display screen and the second display screen are the same and positioned on the 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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| 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 |
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Effective date of registration: 20201010 Address after: 261031 north of Yuqing street, east of Dongming Road, high tech Zone, Weifang City, Shandong Province (Room 502, Geer electronic office building) Applicant after: GoerTek Optical Technology Co.,Ltd. Address before: 266100 Qingdao, Laoshan District, North House Street investment service center room, Room 308, Shandong Applicant before: GOERTEK TECHNOLOGY Co.,Ltd. |
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