CN107063646A - Method, device and the virtual reality helmet of lens effective focal length are determined using camera - Google Patents
Method, device and the virtual reality helmet of lens effective focal length are determined using camera Download PDFInfo
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- CN107063646A CN107063646A CN201710500832.3A CN201710500832A CN107063646A CN 107063646 A CN107063646 A CN 107063646A CN 201710500832 A CN201710500832 A CN 201710500832A CN 107063646 A CN107063646 A CN 107063646A
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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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- Testing Of Optical Devices Or Fibers (AREA)
Abstract
The invention discloses method, device and the virtual reality helmet that a kind of use camera determines lens effective focal length, method includes：Regulation 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, the distance of lens and display screen is adjusted for Theoretical Design position and is fixed, at camera lens to the exit pupil position of lens for adjusting camera；The virtual image of the display screen generated by camera controller control camera to lens carries out the control focal length value that camera controller corresponding with each photo was taken pictures and recorded in continuous scanning, and the virtual image distance of lens is drawn according to control focal length value corresponding with definition highest photo；By the virtual image distance of lens and the functional relation of the effective focal length of lens and virtual image distance, the effective focal length of lens is drawn.In this way, the use camera that the present invention is provided determines the method and device of lens effective focal length, it can accurately and accurately detect the effective focal length of VR lens.
Description
Technical field
The present invention relates to optical technical field, lens effective 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 effective focal length of lens is to influence eye-observation to image
How the major influence factors of definition, therefore, high efficiency and accurately detect out the effective focal lengths of lens, as this area
Technical staff's important technological problems to be solved.
The content of the invention
In view of this, it is an object of the invention to provide the method and dress that a kind of use camera determines lens effective focal length
Put, it can accurately and accurately detect the effective focal length of VR lens.
The invention provides a kind of method that use camera determines lens effective focal length, methods described is applied to lens mould
Group, 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, adjusts the distance of the lens and display screen for Theoretical Design position and fixed, adjusts the camera lens of the camera to institute
State at the exit pupil position of lens；
The virtual image for controlling the display screen that the camera generates to the lens by camera controller is continuously swept
The control focal length value for taking pictures and recording the camera controller corresponding with each photo is retouched, is shone according to definition highest
The corresponding control focal length value of piece draws the virtual image distance of the lens；
By the virtual image distance of the lens and the functional relation of the effective focal length of the lens and virtual image distance, institute is drawn
State the effective focal length of lens.
Preferably, by choose the lens and test system of multiple known effective focal lengths obtain each it is described it is known effectively
The corresponding virtual image distance of lens of focal length, sets up the effective focal length of the lens and the functional relation of virtual image distance.
Preferably, the virtual image distance of the lens of each known effective focal length, including step are measured by test system：
Adjust the position of the camera and the display screen, be located at respectively the known effective focal length lens front and rear two
Side, and make the camera lens optical axis of the camera and the normal parallel of the display screen, the camera lens of the camera and described known effective
The optical axises of the lens of focal length is conllinear, adjust the lens of the known effective focal length and the distance of display screen be Theoretical Design position,
And it is fixed, at the exit pupil position for adjusting lens of the camera lens of the camera to the known effective focal length；
The display screen that the camera generates to the lens of the known effective focal length is controlled by camera controller
The virtual image carries out the control focal length value that the camera controller corresponding with each photo was taken pictures and recorded in continuous scanning, according to
The corresponding control focal length value of definition highest photo draws the virtual image distance of the lens of the known effective focal length；
Repeat the above steps, draw the virtual image distance of the lens of each known effective focal length.
Preferably, the distance of the adjustment lens and display screen is Theoretical Design position and the Theoretical Design position is institute
State the theoretical back focal length position of lens.
Preferably, it is Theoretical Design position and the reason to adjust the lens of the known effective focal length and the distance of display screen
By theoretical back focal length position of the design attitude for the lens of the known effective focal length.
Present invention also offers the device that a kind of use camera determines lens effective focal length, described device is applied to lens mould
Group, the lens module includes lens and display screen；
The lens are located between the camera and the display screen, and the camera lens optical axis of the camera and the display
The normal parallel of screen, the camera lens of the camera are conllinear with the optical axis of the lens；
The camera lens of the camera is located at the exit pupil position of the lens, and the display location is in the rear of the lens
Theoretical Design position, the Theoretical Design position is the theoretical back focal length position of the lens, and the display screen and the lens
Distance fix.
Preferably, the camera includes camera sensor, camera controller and camera lens, and the camera controller can
Automatically control the focal distance of the camera.
Present invention also offers a kind of virtual reality helmet, it is saturating that the virtual reality helmet includes at least one
Mirror module, the lens module includes lens and display screen, and the interpupillary distance that the virtual reality helmet is set is arranged at described
In the preset range of the effective focal length of lens, wherein the effective focal length of the lens is determined using the method described in upper any one.
Preferably, the interpupillary distance is equal to the effective focal length of the camera.
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.
The method that a kind of use camera that the present invention is provided determines lens effective focal length, it should be appreciated that when testing out
After the virtual image distance of lens, effective Jiao of lens can be drawn according to the functional relation of the effective focal length of lens and virtual image distance
Away from.Specifically the process of the virtual image distance of test lens is：Adjust the position of camera and display screen, be located at front and rear the two of lens respectively
Side, 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, adjustment lens with
The distance of display screen is Theoretical Design position and fixed, at camera lens to the exit pupil position of lens for adjusting camera；Pass through camera control
The virtual image that device control camera processed is generated to lens carries out continuous scan and takes pictures and record camera controller corresponding with each photo
Control focal length value, according to it is corresponding with definition highest photo control focal length value draw lens the virtual image distance, it is necessary to say
Bright, the control focal length value of camera and the virtual image distance of lens have corresponding relation, that is, obtain after the control focal length value of camera i.e.
The virtual image distance of lens can be obtained.
Finally, by the virtual image distance and functional relation of lens, the effective focal length of lens is drawn.
In this way, the method for determining lens effective focal length according to the use camera that the present invention is provided, it can be accurately and accurately
Detect the effective focal length of VR lens.
Present invention also offers the device that a kind of use camera determines lens effective focal length, it can be realized by the device
The method that lens effective focal length is determined using camera is stated, and then can accurately and accurately detect the effective focal length of VR lens.
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 effective focal length device schematic diagram；
Fig. 2 is the functional relation schematic diagram of effective focal length and virtual image distance in the embodiment of the present invention.
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 effective focal length, it can be high
Imitate, accurately detect out the effective focal lengths 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, a kind of use camera that the present embodiment is provided determines the side of lens effective focal length
Method, first, chooses the lens of multiple known effective focal lengths, and obtains by test system the lens pair of each known effective focal length
The virtual image distance answered, set up the effective focal length of lens and the functional relation of virtual image distance, the i.e. effective focal length of lens and the virtual image away from
From having functional relation.
However, the virtual image distance of test lens 12, it should be appreciated that after the virtual image distance of lens 12 is tested out, root
The effective focal length of lens 12 can be drawn according to above-mentioned functional relation.Specifically the process of the virtual image distance of test lens 12 is：Regulation
The position of camera 11 and display screen 13, the front and rear sides for being located at 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, and the distance of adjustment lens 12 and display screen 13 is theory
Design attitude is simultaneously fixed, at camera lens to the exit pupil position of lens 12 for adjusting camera 11；Camera 11 is controlled by camera controller
The control focal length that camera controller corresponding with each photo was taken pictures and recorded in continuous scanning is carried out to the virtual image that lens 12 are generated
Value, draws the virtual image distance of lens 12, it is necessary to explanation, phase according to control focal length value corresponding with definition highest photo
The control focal length value of machine 11 can be obtained after having corresponding relation, that is, the control focal length value for obtaining camera 11 with the virtual image distance of lens 12
Obtain the virtual image distance of lens 12.
Finally, by the virtual image distance and functional relation of lens 12, the effective focal length of lens 12 is drawn.
In this way, the method for determining lens effective focal length according to the use camera that the present embodiment is provided, it can efficiently, accurately
Ground detects the effective focal length of VR lens.
It should be noted that in the present embodiment, the corresponding virtual image of lens of each known effective focal length of test system and test
When distance, functional relation to set up effective focal length and virtual image distance, can adjust first camera 11 and display screen 13 position,
It is located at the front and rear sides of the lens of known effective focal length respectively, and the camera lens optical axis of camera 11 is put down with the normal of display screen 13
Row, the camera lens of camera 11 are conllinear with the optical axis of the lens of known effective focal length, the lens and display screen of the known effective focal length of adjustment
13 distance is Theoretical Design position and fixed, adjusts the camera lens of camera 11 to the exit pupil position of the lens of known effective focal length
Place；
The virtual image for controlling the lens of effective focal length known to 11 pairs of camera to generate by camera controller carries out continuous scanning and clapped
The control focal length value of camera controller corresponding with each picture is taken and records, according to corresponding with definition highest photo
Control focal length value draws the virtual image distance of the lens of known effective focal length；It should be noted that definition highest photo is determined,
The definition by each photo is needed to be contrasted, to select relative articulation highest photo.Such as, contrast can be passed through
The MTF (modulation transfer function) of each photo determines clear photograph the most, certainly, other be able to can also be reflected by contrasting
The technical parameter of image definition is determined, and is no longer introduced one by one herein
Repeat the above steps, draw the virtual image distance of the lens of each known effective focal length.
The virtual image of the lens of each known effective focal length of above-mentioned test apart from when, the virtual image distance with above-mentioned test lens 12
When the step of it is basically identical.In this way, the virtual image distance of the lens of each known effective focal length can accurately be tested out, to set up
The functional relation of effective focal length and virtual image distance.
In the preferred scheme of the present embodiment, the distance of above-mentioned adjustment lens 12 and display screen 13 for Theoretical Design position and
The Theoretical Design position is the theoretical back focal length position of lens 12.Be arranged such, test lens 12 the virtual image apart from when, camera
11 each photo shot are more clear, and test result is more accurate.
Equally, the distance of the lens of effective focal length known to above-mentioned adjustment and display screen 13 is Theoretical Design position and the reason
By the theoretical back focal length position for the lens that design attitude is known effective focal length.
Further, in the present embodiment, display screen 13 shows RGB image, can specifically combine virtual image when lens 12 are designed
Away from corresponding wavelength size.
The present embodiment additionally provides the device that a kind of use camera determines lens effective focal length, including camera 11 and 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 camera lens of camera 11 is located at the exit pupil position of lens 12, and display screen 13 is located at the Theoretical Design at the rear of lens 12
Position, and the distance of display screen 13 and lens 12 fixes.
The device provided by the present embodiment, can realize that the use camera in above-described embodiment determines lens effective focal length
Method, therefore, it can accurately and accurately detect the effective focal length of VR lens.
In the present embodiment, camera 11 can include camera sensor, camera controller and camera lens, camera controller energy
Enough automatically control the focal distance of camera 11.It is arranged such, camera controller can automatically control the focal distance of camera 11, adjusts
Whole speed and focusing is accurate.
In addition, changing different lens 12 for convenience and the lens of different known effective focal lengths, in the present embodiment, also
The bearing fixture for being used to carry lens 12 and the lens of known effective focal length can be included.
Content, will combine specific data, the present embodiment will be described in detail below.
If the effective focal length design load of lens is 42mm, after lens surface to the distance between display screen 13 be 40.55mm, void
Image distance design load is 1.5M or so.The effective focal length of the camera 11 of selected test system is 160mm, F#3.5, camera pixel
3 μm of size, allows that disperse circular diameter takes 6 μm, adjusts the focal distance 1.5m of camera 11, can calculate the field depth of camera 11 is
1498mm-1502mm.According to object-image relation as the effective focal length change ± 0.01mm of lens, the virtual image can be caused away from changing about
12mm, the precision of camera 11 is enough to identify the variable quantity.
The lens of known effective focal length are detected by the test system, each corresponding virtual image distance is obtained.Such as
Shown in following table, the functional relation schematic diagram specifically obtained is as shown in Figure 2：
According to the above results, then the corresponding relation of effective focal length and virtual image distance is obtained.In general, for demarcation
Know that the lens numbers of effective focal length are more, then measurement result is finer.For the present embodiment, the effective focal length of test system
Measurement accuracy is about ± 0.005mm, and because the control camera scanning virtual image scope of camera controller is smaller, speed,
The single lens testing time is shorter, can meet the detection in actual production.The bearing fixture of used lens in the program, can
It is designed according to the appearance profile of lens.The requirement of current VR high-aperture lens test can be met.
The present embodiment additionally provides a kind of virtual reality helmet, and virtual reality helmet includes at least one lens
Module, lens module includes lens and display screen, and the interpupillary distance that virtual reality helmet is set is arranged at the effective focal length of lens
Preset range in, wherein the effective focal length of lens is determined using the method described in any of the above-described embodiment.Further, interpupillary distance
Equal to the effective focal length of camera.
It should be noted that above-mentioned interpupillary distance refers to the pupil of user the distance between to lens.It is arranged such, user can
It was observed that more clearly indicating effect.
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；First lens
Identical with the second lens and positioned at same horizontal line, the first display screen is identical with second display screen and positioned at same horizontal line.Such as
This is set, and can realize clearly stereo display effect.
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 effective focal length, it is characterised in that methods described is applied to lens module, institute
Stating 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, adjusts the distance of the lens and display screen for Theoretical Design position and fixed, adjusts the camera lens of the camera to described
At the exit pupil position of mirror；
Control the virtual image for the display screen that the camera generates the lens to carry out continuous scanning by camera controller to clap
Take and record the control focal length value of the camera controller corresponding with each picture, according to definition highest photo pair
The control focal length value answered draws the virtual image distance of the lens；
By the virtual image distance of the lens and the functional relation of the effective focal length of the lens and virtual image distance, draw described
The effective focal length of mirror.
2. the method as described in claim 1, it is characterised in that by choosing the lens of multiple known effective focal lengths and testing
System obtains the corresponding virtual image distance of lens of each known effective focal length, sets up effective focal length and the virtual image of the lens
The functional relation of distance.
3. method as claimed in claim 2, it is characterised in that measured by test system described in each known effective focal length
The virtual image distance of lens, including step：
Adjust the position of the camera and the display screen, be located at respectively the known effective focal length lens front and rear sides,
And make the camera lens optical axis of the camera and the normal parallel of the display screen, the camera lens of the camera and the known effective focal length
Lens optical axis it is conllinear, adjust the lens of the known effective focal length and the distance of display screen for Theoretical Design position and solid
It is fixed, at the exit pupil position for adjusting lens of the camera lens of the camera to the known effective focal length；
The virtual image of the camera to the display screen of the lens generation of the known effective focal length is controlled by camera controller
Carry out the control focal length value that the camera controller corresponding with each photo was taken pictures and recorded in continuous scanning, according to it is clear
The corresponding control focal length value of degree highest photo draws the virtual image distance of the lens of the known effective focal length；
Repeat the above steps, draw the virtual image distance of the lens of each known effective focal length.
4. the method as described in claim any one of 1-3, it is characterised in that the distance of the adjustment lens and display screen is reason
By the theoretical back focal length position that design attitude and the Theoretical Design position are the lens.
5. method as claimed in claim 4, it is characterised in that the lens of the adjustment known effective focal length and display screen away from
From the theoretical back focal length position for lens that Theoretical Design position and the Theoretical Design position are the known effective focal length.
6. a kind of use camera determines the device of lens effective focal length, it is characterised in that described device is applied to lens module, institute
Stating lens module includes lens and display screen；
The lens are located between the camera and the display screen, and the camera lens optical axis of the camera and the display screen
Normal parallel, the camera lens of the camera are conllinear with the optical axis of the lens；
The camera lens of the camera is located at the exit pupil position of the lens, and the display location is in the theory at the rear of the lens
Design attitude, the Theoretical Design position is the theoretical back focal length position of the lens, and the display screen and the lens away from
From fixation.
7. the device of lens effective focal length is determined using camera as claimed in claim 6, it is characterised in that the camera includes
Camera sensor, camera controller and camera lens, the camera controller can automatically control the focal distance of the camera.
8. a kind of virtual reality helmet, it is characterised in that the virtual reality helmet includes at least one lens mould
Group, the lens module includes lens and display screen, and the interpupillary distance that the virtual reality helmet is set is arranged at the lens
Effective focal length preset range in, wherein the effective focal length of the lens is using described in the claims any one of 1-5
Method is determined.
9. virtual reality helmet according to claim 8, it is characterised in that the interpupillary distance is equal to the camera
Effective focal length.
10. virtual reality helmet according to claim 8, it is characterised in that the virtual reality helmet bag
Include the first lens module and the second lens module, the first lens module includes the first lens and the first display screen, described the
Two lens modules include the second lens and second display screen；First lens are identical with second lens and positioned at same water
Horizontal line, first display screen is identical with the second display screen and positioned at same horizontal line.
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| CN201710500832.3A CN107063646B (en) | 2017-06-27 | 2017-06-27 | Method and device for determining effective focal length of lens by adopting camera and virtual reality headset |
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| CN117073988A (en) * | 2023-08-18 | 2023-11-17 | 交通运输部公路科学研究所 | System and method for measuring distance of head-up display virtual image and electronic equipment |
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| CN108012147A (en) * | 2017-12-22 | 2018-05-08 | 歌尔股份有限公司 | The virtual image of AR imaging systems is away from test method and device |
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