CN103852243B - Method for detecting optical center of wide-angle lens and optical center detecting device - Google Patents
Method for detecting optical center of wide-angle lens and optical center detecting device Download PDFInfo
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Abstract
A method of detecting an optical center of a wide-angle lens and an optical center detecting apparatus. The method for detecting the optical center of the wide-angle lens comprises the following steps: the optical path changing element is sleeved on the wide-angle lens; the wide-angle lens receives the light generated by the light source through the optical path changing element to generate a detection image; and determining the optical center according to the detection image. An optical center detecting device includes a wide-angle lens, an optical path changing element, and an image processing unit. The optical path changing element is sleeved on the wide-angle lens. The image processing unit is coupled to the wide-angle lens and used for receiving the light generated by the light source through the wide-angle lens via the optical path changing element to generate a detection image and determining an optical center of the wide-angle lens according to the detection image.
Description
Technical field
The present invention relates to the detection of optical center, particularly relate to and a kind of utilize optical path to change element to promote in uniform light degree detect the method for the optical center of wide-angle lens and its optical center detecting device being correlated with.
Background technology
In the scope of image procossing, in order to obtain good image quality, it may be desirable to determine the optical center (opticalcenter) of lens exactly.For wide-angle lens (wide-anglelens) (such as, fish eye lens (fisheyelens)), if the position of optical center can be determined exactly, then the effect of image compensation and correction (such as, correcting fisheye image) can be substantially improved.For example, when producing panoramic picture (panorama) by image stitching (imagestitching) process, the optical center position found is more accurate, and then produces high-quality panoramic picture.
It is the term traditionally used to one of method of detection optical center, is camera lens is developed in light-source box (LightBox), then according to the image formed through camera lens to detect optical center.But, when detecting fish-eye optical center, owing to fish eye lens has convex minute surface, so in the step fish eye lens of convex surface and planar light source case fitted, both also cannot be smooth veritably.Once the angle that fish eye lens and light-source box are fitted has offset, being incident to fish-eye light can be uniform not, cause that the optical center detected produces error.
Accordingly, it would be desirable to the optical center detection method of a kind of innovation, promote the accuracy of the optical center of detection wide-angle lens.
Summary of the invention
In view of this, an object of the present invention is in that providing a kind of utilizes optical path to change element to promote in uniform light degree to detect method and its relevant optical center detecting device of the optical center of wide-angle lens, solves the problems referred to above.
According to one embodiment of the invention, it discloses a kind of method of optical center detecting a wide-angle lens.The method comprises the steps of and an optical path change element housing is connected to this wide-angle lens；This wide-angle lens changes element reception light produced by a light source via this optical path and detects image to produce one；And determine this optical center according to this detection image.
According to one embodiment of the invention, it discloses a kind of optical center detecting device.This optical center detecting device comprises a wide-angle lens, an optical path changes element and a graphics processing unit.This optical path changes element housing and is connected to this wide-angle lens.This graphics processing unit is coupled to this wide-angle lens, detects image in order to changing element reception light produced by a light source via this optical path through this wide-angle lens to produce one, and determines an optical center of this wide-angle lens according to this detection image.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of an embodiment of optical center of the present invention detection system.
Fig. 2 is the schematic diagram to an embodiment of wide-angle lens 130 of the light produced by light-source box as shown in Figure 1.
Fig. 3 is the schematic diagram of the detection image produced corresponding to the optical path shown in Fig. 2.
Fig. 4 is the schematic diagram determining a binary image according to the detection image shown in Fig. 3.
Fig. 5 is the flow chart that the present invention detects an embodiment of the method for an optical center of a wide-angle lens.
Fig. 6 is that the present invention detects the pixel value of the binary image shown in Fig. 4 to determine the schematic diagram of an embodiment of the geometric center of image object.
Fig. 7 is the statistics schematic diagram of the multiple row testing results shown in Fig. 6.
Fig. 8 is the schematic diagram of the embodiment producing a detection image in the optical center detecting device shown in Fig. 1 according to environment light.
Fig. 9 is the schematic diagram of the embodiment that the detection image shown in Fig. 8 carries out binarization operation and pixel value modification.
Figure 10 is the flow chart that the present invention detects another embodiment of the method for an optical center of a wide-angle lens.
[main element symbol description]
100 optical center detection systems
110 light-source box
120 optical center detecting devices
130 wide-angle lens
140 pipe boxes
150 graphics processing units
500,510,520,530,540,550, step
1032、1036
P_11, P_12, P_1n, P_m1, P_mn pixel
DW_H, DW_V detect pane
RB, RB ', RBB ' image object
Detailed description of the invention
Referring to Fig. 1, it is the schematic diagram of an embodiment of optical center of the present invention detection system 100.Optical center detection system 100 comprises light-source box 110 and an optical center detecting device 120, wherein optical center detecting device 120 comprises wide-angle lens 130, optical path change element (opticalpathchangingdevice) (in this embodiment, it is a pipe box (sleeve) (or sleeve (bushing)) 140) and a graphics processing unit 150.Pipe box 140 is socketed on wide-angle lens 130.Graphics processing unit 150 is coupled to wide-angle lens 130, detects image in order to receive light produced by light-source box 110 through wide-angle lens 130 to produce one, and determines an optical center of wide-angle lens 130 according to this detection image.In this embodiment, wide-angle lens 130 is put pipe box 140, the light that wide-angle lens receives is made mostly to come from the inwall of pipe box 140, not only can make wide-angle lens 130 in uniform light, imaging region in this detection image produced is also about the sensitive volume of wide-angle lens 130, and therefore, user can prepare can the tool of accurate para-position, it is close to light-source box 110 without by wide-angle lens 130, accurate optical center position can be obtained according to this detection image.Further instruction is as follows.
See also Fig. 1 and Fig. 2.Fig. 2 is light produced by light-source box 110 as shown in Figure 1 to the schematic diagram of an embodiment of wide-angle lens 130.In this embodiment, the light that wide-angle lens 130 receives represents with light L1～L3, wherein light L1 represents and is produced by light-source box 110 and be directly transmitted to the light of wide-angle lens 130, light L2 represents via the light being just incident to wide-angle lens 130 after the reflection within pipe box 140, and light L3 represents the light being just incident to wide-angle lens 130 after penetrating pipe box 140.As shown in Figure 2, owing to light can be reflexed to wide-angle lens 130 by pipe box 140 inwall, and cover the some light coming from light-source box 110 outside pipe box 140, therefore, wide-angle lens 130 can more than the sensitive volume VR2 energy received in the particular range VR1 energy received, and wherein particular range VR1 is corresponding to the cross section of pipe box 140.In this embodiment, pipe box 140 is made up of light-permeable material.In another embodiment, pipe box 140 can also be made up of (inwall can be reflective) light tight material.
As known from the above, pipe box 140 can change the optical path to wide-angle lens 130 of the light produced by light-source box so that light received in the sensitive volume VR2 of wide-angle lens 130 may be from the light after reflecting via pipe box 140/reflect.It should be noted that, pipe box 140 changes element as optical path and is intended for needing of explanation, is not used as the restriction of the present invention, in other words, it is connected to wide-angle lens so that the element that is more uniformly distributed of wide-angle lens light as long as can overlap, all can be used as optical path and change element.
Please consult Fig. 3 together with Fig. 2.Fig. 3 is the schematic diagram of the detection image IMG_D produced corresponding to the optical path shown in Fig. 2.From the figure 3, it may be seen that image range R1 is corresponding to the particular range VR1 of wide-angle lens 130, and image range R2 is corresponding to the sensitive volume VR2 of wide-angle lens 130, and wherein the image boundary of image range R2 constitutes the geometry (that is, circular) of a symmetry.Therefore, it can to find out easily the geometric center (that is, the center of circle) of image range R2, and then determine the optical center of wide-angle lens 130.
Referring to Fig. 4, it for determining the schematic diagram of a binary image according to the detection image IMG_D shown in Fig. 3.In this embodiment, detection image IMG_D is carried out a binarization operation (binary-conversion) to produce a binary image (binaryimage) IMG_B by the graphics processing unit 150 shown in Fig. 1, to determine the optical center of wide-angle lens 130 according to binary image IMG_B.More specifically, each pixel value (or brightness value) among detection image IMG_D can be compared by graphics processing unit 150 respectively with a threshold value (threshold), produce binary image IMG_B, wherein this threshold value can adopt a preset value to set, it is also possible to sets according to the pixel value of every time obtained detection image.In this embodiment, in the visual range (the image object RB corresponding to bright/white) of binary image IMG_B, the pixel value of each pixel is one first bi-values (binaryvalue) (such as, 1), and the pixel value of other pixels of visual range outer (darkness/black region) is one second bi-values (such as, 0), wherein this second bi-values is different from this first bi-values.It follows that the graphics processing unit 150 shown in Fig. 1 will pass through the geometric center calculating image object RB, determine the optical center of wide-angle lens 130.
Referring to Fig. 5, it detects the flow chart of an embodiment of method of an optical center of a wide-angle lens for the present invention.The method can be applicable to the optical center detecting device 120 shown in Fig. 1, and can simply be summarized as follows:
Step 500: start.
Step 510: by a pipe box (that is, one optical path change element) be socketed on this wide-angle lens.
Step 520: to receive light produced by a light source via this pipe box through this wide-angle lens and detect image (such as, covering image) to produce one.
Step 530: this detection image is carried out a binarization operation to produce a binary image.
Step 540: calculate the geometric center (such as, the center of circle) of the visual range image object of white (that is) of this binary image, to determine this optical center.
Step 550: terminate.
In step 530, this binarization operation can be carried out by suitable threshold value, to produce this binary image with a maximum visual scope (such as, there is the circle of same bi-values).Due to skilled persons via read Fig. 1～Fig. 4 related description after, the details of operation of the step 510 shown in Fig. 5～step 530 should be understood easily, therefore further instruction just repeats no more at this.It should be noted that in step 540, this binary image can be carried out the detection of pixel value, obtain the border of the visual range of this binary image, and then determine the geometric center of visual range.Further instruction is as follows.
Referring to Fig. 6, it detects the pixel value of the binary image IMG_B shown in Fig. 4 to determine the schematic diagram of an embodiment of the geometric center of image object RB for the present invention.In this embodiment, binary image IMG_B have multiple pixel P_11～P_mn(that is, m row be multiplied by n row pel array).First, for every a line (row) pixel in binary image IMG_B, a horizontal detection pane DW_H is moved from left to right and from top to bottom in units of a pixel, with all pixels detected in each row and produce corresponding a line testing result, and then obtain the distribution scenario of the pixel value of each pixel in this row；Similarly, for every string (column) pixel in binary image IMG_B, a vertical detection pane DW_V is moved from top to bottom and from left to right in units of a pixel, with all pixels detected in each row and produce corresponding string testing result, and then obtain the distribution scenario of the pixel value of each pixel in these row.Finally, then determine the geometric center of image object RB according to the multiple row testing results corresponding to m row pixel and the multiple row testing results corresponding to n row pixel.
In implementation, horizontal detection pane DW_H can be set as the detection pane (that is, can simultaneously detect two pixels adjacent among same a line) of " 1 × 2 ".Horizontal detection pane DW_H first can proceed by detection, two pixels of one-time detection from the pixel of the 1st row (that is, pixel P_11 and pixel P_12), and is moved right to continue to detect in units of a pixel.When pixel among horizontal detection pane DW_H has different bi-values, represent horizontal detection pane DW_H and be currently under the border of image object RB, therefore, location of pixels corresponding to horizontal detection pane DW_H can be recorded, for the use of the pixel value distribution scenario of follow-up this row of acquirement.
In this embodiment, when horizontal detection pane DW_H moves to location of pixels A_1P(with horizontal detection pane DW_H(A_1P) represent) time, among horizontal detection pane DW_H, left pixel value is bi-values " 0 ", right pixel value is bi-values " 1 ", and it represents horizontal detection pane DW_H and is just scanned up to white portion by black region on binary image IMG_B.Location of pixels A_1P corresponding to current horizontal detection pane DW_H can be recorded by the graphics processing unit 150 shown in Fig. 1.Additionally, when horizontal detection pane DW_H persistently moves to location of pixels A_1Q(with horizontal detection pane DW_H(A_1Q) represent) time, among horizontal detection pane DW_H, left pixel value is bi-values " 1 ", right pixel value is bi-values " 0 ", it represents horizontal detection pane DW_H and is just scanned up to black region by white portion on binary image IMG_B, therefore, the location of pixels A_1Q corresponding to current horizontal detection pane DW_H can be recorded by the graphics processing unit 150 shown in Fig. 1.After the 1st all of pixel of row has completed detection all, graphics processing unit 150 shown in Fig. 1 can calculate note down location of pixels (that is, location of pixels A_1P and location of pixels A_1Q) a mean place, using as row testing result DR_R1(that is, row testing result DR_R1 is the meansigma methods of location of pixels A_1P and location of pixels A_1Q).It follows that horizontal detection pane DW_H may proceed to the pixel value of each pixel in detection the 2nd row, until all of pixel all completes detection in m row.
After in m row, all of pixel all completes detection, the occurrence number of the mean place corresponding to multiple row testing result DR_R1～DR_Rm can be added up by the graphics processing unit 150 shown in Fig. 1, to determine that the geometric center of image object RB is in the coordinate of horizontal direction.Referring to Fig. 7, it is the statistics schematic diagram of the multiple row testing result DR_R1～DR_Rm shown in Fig. 6.In this embodiment, the position that occurrence number is maximum is location of pixels A0, and in other words, the geometric center of image object RB is location of pixels A0 in the coordinate (that is, the horizontal coordinate in the center of circle) of horizontal direction.
Similarly, graphics processing unit 150 shown in Fig. 1 is possible with vertical detection pane DW_V(such as, the detection pane of " 2 × 1 ") detect the every string pixel in binary image IMG_B, record vertical detection pane DW_V occur location of pixels corresponding during different bi-values, and calculate a mean place of the location of pixels recorded in these row using as this row testing result.Finally, then add up obtained multiple row testing results, to determine that the geometric center of image object RB is in the coordinate of vertical direction.Via above detecting step, just can detect that the position of the optical center of wide-angle lens 130.
Note that the horizontal detection pane DW_H of the above pane size to have " 1 × 2 " illustrates, therefore, the distance that horizontal detection pane DW_H moves every time is a pixel.But, it is " 1 × 2 " that the pane size of horizontal detection pane DW_H does not limit, and therefore, the distance that horizontal detection pane DW_H moves every time also can adjust according to pane size.Similarly, it is " 2 × 1 " that the pane size of vertical detection pane DW_V does not limit, and the distance that vertical detection pane DW_V moves every time also can adjust according to pane size.It addition, the direction that horizontal detection pane DW_H moves can be from right to left, and the direction that vertical detection pane DW_V moves can also be from the bottom to top.
Although the wide-angle lens 130 shown in Fig. 1 is substantially smooth in light-source box 110, but, relative position between light source and wide-angle lens is not limited by optical center detecting device proposed by the invention and detection method to some extent, that is, wide-angle lens can be close to light-source box, and the incident illumination of light-source box is also not necessarily intended to the optical axis (opticalaxis) being parallel to wide-angle lens, even can only by substantially uniform environment light detect wide-angle lens optical center (that is, it may not be necessary to light-source box).
Referring to Fig. 8, it for producing the schematic diagram of an embodiment of a detection image IMG_D ' in the optical center detecting device 120 shown in Fig. 1 according to environment light.In this embodiment, the visual range of detection image IMG_D ' is except image range R1 ' (cross section corresponding to pipe box 140) and image range R2 ' (visual range corresponding to wide-angle lens 130), also comprise image range R22 ', the iridescent image that wherein image range R22 ' causes for environment light.It addition, also present the phenomenon of brightness disproportionation in image range R1 '.
In order to ensure the accuracy of the optical center detected, can reduce/prevent iridescent image by the pixel value of correction map picture or impact that brightness disproportionation causes.See also Fig. 9 and Figure 10.Fig. 9 is the schematic diagram of the embodiment that the detection image IMG_D ' shown in Fig. 8 carries out binarization operation and pixel value modification.Figure 10 is the flow chart that the present invention detects another embodiment of the method for an optical center of a wide-angle lens, and wherein the method shown in Figure 10 is based on the method shown in Fig. 5.After detection image IMG_D ' is carried out binarization operation (as shown in step 530), producing binary image IMG_B ' (as shown in the first half of Fig. 9), wherein binary image IMG_B ' comprises image object RB ' (corresponding to image range R2 ') of a white and image object RBB ' (corresponding to image range R22 ') of a white.In this embodiment, among image object RB '/image object RBB ', the pixel value of each pixel is one first bi-values (such as, " 1 ").It addition, image object RB ' encloses the empty pixel (holepixel) (that is, the black region that image object RB ' surrounds) with one second bi-values (such as, " 0 "), wherein this second bi-values is different from this first bi-values.
In step 1032, first the graphics processing unit 150 shown in Fig. 1 can judge the maximum object of in binary image IMG_B ' (that is, image object RB ') via the pixel quantity of image object RB ' and RBB '；It follows that the pixel value of each pixel in other objects (that is, image object RBB ') except this maximum object is revised as this second bi-values (such as, " 0 "), other objects to be set as black background (as shown in the mid portion of Fig. 9).In step 1036, the pixel value of the empty pixel that can be surrounded by image object RB ' is revised as this first bi-values (such as, " 1 "), to remove undesired black image (as shown in the mid portion of Fig. 9)；Finally, optical center (as shown in step 540) is determined again according to amended binary image IMG_B ' (as shown in the lower half of Fig. 9), for example, the detection method shown in Fig. 6 and the 7 can be used to determine the geometric center of amended binary image IMG_B ', to determine the position of optical center.
Significantly, since the size that the size of image object RBB ' is much smaller than image object RB ', even if therefore eliminate other objects beyond by maximum object and be set to the step of background, the optical center of detected wide-angle lens 130 is still fairly accurate.It addition, the size that the black region that surrounds of image object RB ' is much smaller than image object RB ', therefore, the step removing the undesired black image that maximum object surrounds also is dispensed with.In other words, after obtaining maximum object, this maximum object of direct basis determines that optical center is also feasible.
It addition, after obtaining maximum object, it is also possible to only carry out other objects are set to background step and one of them of the step removing cavity pixel.In an implementation example, after image object RBB ' is set as background (as Suo Shi step 1032), it is also possible to directly perform step 540 and determine optical center.In another implementation example, after obtaining image object RB ' in binary image IMG_B ', it is also possible to directly remove image object RB ' the empty pixel (as indicated at step 1036) surrounded, and then perform step 540 to determine optical center.
The foregoing is only the preferred embodiments of the present invention, all equalizations done according to claims of the present invention change and modify, and all should belong to the covering scope of the present invention.
Claims (16)
1. the method detecting an optical center of a wide-angle lens, comprises:
One optical path is changed element housing and is connected to this wide-angle lens；
This wide-angle lens changes element reception light produced by a light source via this optical path and detects image to produce one, wherein this optical path changes the internal face of element is a light reflection surface, this wide-angle lens receives this light source and is produced and change, via this optical path, the light that the light reflection surface of element reflects, to produce this detection image；And
This optical center is determined according to this detection image.
2. the method for claim 1, wherein this optical path change element is made up of light-permeable material or light tight material.
3. the method detecting an optical center of a wide-angle lens, comprises:
One optical path is changed element housing and is connected to this wide-angle lens；
This wide-angle lens changes element reception light produced by a light source via this optical path and detects image to produce one；
This detection image is carried out a binarization operation to produce a binary image；
This binary image moves a horizontal detection pane in the horizontal direction, to detect all pixels of each row in this binary image and to produce multiple row testing result；
This binary image moves in the vertical direction a vertical detection pane, to detect all pixels of each row in this binary image and to produce multiple row testing result；And
This optical center is determined according to the plurality of row testing result and the plurality of row testing result.
4. method as claimed in claim 3, if wherein this binary image comprises multiple object, in each object, the pixel value of each pixel is one first bi-values, then judge the maximum object of in this binary image according to the pixel quantity of each object, and detect in this maximum object all pixels of each row, column to produce the plurality of row testing result and the plurality of row testing result.
5. method as claimed in claim 4, the pixel value of each pixel in other objects except this maximum object is revised as one second bi-values by further, and wherein this second bi-values is different from this first bi-values.
6. method as claimed in claim 4, if wherein this maximum object encloses at least one pixel with one second bi-values, is revised as this first bi-values by the pixel value with this at least one pixel of this second bi-values further.
7. the method as described in any one in claim 3 to 6, the step wherein producing the plurality of row testing result and the plurality of row testing result comprises:
When the pixel corresponding to this horizontal detection pane has different bi-values, record this location of pixels corresponding to horizontal detection pane；
When the pixel corresponding to this vertical detection pane has different bi-values, record this location of pixels corresponding to vertical detection pane；And
After the pixel of each row and each row has completed detection all, calculate a mean place of the location of pixels recorded in each row and each row, using as corresponding row testing result and row testing result.
8. according to the plurality of row testing result and the plurality of row testing result, method as claimed in claim 7, wherein determines that the step of this optical center comprises:
Add up the occurrence number of mean place corresponding to the plurality of row testing result and the plurality of row testing result respectively；And
The location of pixels that in the location of pixels maximum according to occurrence number in the plurality of row testing result and the plurality of row testing result, occurrence number is maximum determines this optical center.
9. an optical center detecting device, comprises:
One wide-angle lens；
One optical path changes element, is socketed on this wide-angle lens, and it is a light reflection surface that this optical path changes the internal face of element；And
One graphics processing unit, it is coupled to this wide-angle lens, produced by a light source in order to receive through this wide-angle lens and changed, via this optical path, the light that the light reflection surface of element reflects, to produce a detection image, and being determined an optical center of this wide-angle lens according to this detection image.
10. optical center detecting device as claimed in claim 9, wherein this optical path change element is made up of light-permeable material or light tight material.
11. an optical center detecting device, comprise:
One wide-angle lens；
One optical path changes element, is socketed on this wide-angle lens；And
One graphics processing unit, it is coupled to this wide-angle lens, in order to changing element reception via this optical path through this wide-angle lens, produced by a light source, light is to produce a detection image, and this detection image is carried out a binarization operation to produce a binary image by this graphics processing unit；This binary image moves a horizontal detection pane in the horizontal direction, to detect all pixels of each row in this binary image and to produce multiple row testing result；This binary image moves in the vertical direction a vertical detection pane, to detect all pixels of each row in this binary image and to produce multiple row testing result；And this graphics processing unit determines this optical center according to the plurality of row testing result and the plurality of row testing result.
12. optical center detecting device as claimed in claim 11, if wherein this binary image comprises multiple object, in each object, the pixel value of each pixel is one first bi-values, then this graphics processing unit judges the maximum object of in this binary image according to the pixel quantity of each object, and detects in this maximum object all pixels of each row, column to produce the plurality of row testing result and the plurality of row testing result.
13. optical center detecting device as claimed in claim 12, wherein the pixel value of each pixel in other objects except this maximum object is separately revised as one second bi-values being different from this first bi-values by this graphics processing unit.
14. optical center detecting device as claimed in claim 12, if wherein this maximum object encloses at least one pixel with one second bi-values, then the pixel value with this at least one pixel of this second bi-values is separately revised as this first bi-values by this graphics processing unit.
15. the optical center detecting device as described in any one in claim 11 to 14, when wherein the pixel among this horizontal detection pane has different bi-values, this location of pixels corresponding to horizontal detection pane of this graphics processing unit record；When the pixel corresponding to this vertical detection pane has different bi-values, this location of pixels corresponding to vertical detection pane of this graphics processing unit record；And after the pixel of each row and each row has completed detection all, this graphics processing unit calculates a mean place of the location of pixels recorded in each row and each row, using as corresponding row testing result and row testing result.
16. optical center detecting device as claimed in claim 15, wherein this graphics processing unit adds up the occurrence number of the mean place corresponding to the plurality of row testing result and the plurality of row testing result respectively, and determines this optical center according to the location of pixels that occurrence number in the maximum location of pixels of occurrence number in the plurality of row testing result and the plurality of row testing result is maximum.
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| TW101145880A TWI480578B (en) | 2012-12-06 | 2012-12-06 | Method for detecting optical center of wide-angle lens, and optical center detection apparatus |
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| CN107306331A (en) * | 2016-04-19 | 2017-10-31 | 义晶科技股份有限公司 | Image processing method and portable electronic device |
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| CN109163888A (en) * | 2018-08-29 | 2019-01-08 | 歌尔股份有限公司 | Optical centre test method, device and equipment |
| CN109151458B (en) * | 2018-08-31 | 2020-10-09 | 歌尔股份有限公司 | Test model construction method, depth of field module optical center test method and equipment |
| CN111638043B (en) * | 2020-06-10 | 2022-06-14 | 浙江大华技术股份有限公司 | Optical center determining method and device |
| CN111649701B (en) * | 2020-06-30 | 2021-10-29 | 长春博信光电子有限公司 | Method and device for detecting eccentricity value of toric mirror |
| CN112991202B (en) * | 2021-03-01 | 2023-04-25 | 歌尔科技有限公司 | Optical center position calibration method, terminal device and computer readable storage medium |
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| TWI244861B (en) * | 2004-07-06 | 2005-12-01 | Asia Optical Co Inc | Device and method for optical center detection |
| CN1873389A (en) * | 2005-06-03 | 2006-12-06 | 展讯通信（上海）有限公司 | Method applicable to digital camera for calibrating optical center of camera lens |
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| JP2009063420A (en) * | 2007-09-06 | 2009-03-26 | Yazaki Corp | Loading location accuracy inspection apparatus |
| JP5405419B2 (en) * | 2010-09-09 | 2014-02-05 | 富士フイルム株式会社 | Lens inspection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI244861B (en) * | 2004-07-06 | 2005-12-01 | Asia Optical Co Inc | Device and method for optical center detection |
| CN1873389A (en) * | 2005-06-03 | 2006-12-06 | 展讯通信（上海）有限公司 | Method applicable to digital camera for calibrating optical center of camera lens |
| CN101464142A (en) * | 2009-01-13 | 2009-06-24 | 洛阳汉腾光电有限公司 | Detection apparatus and detection method for plain shaft precision of camera |
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| TWI480578B (en) | 2015-04-11 |
| CN103852243A (en) | 2014-06-11 |
| TW201423146A (en) | 2014-06-16 |
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