CN108259894A - A kind of test device and test method of camera module assembly error - Google Patents
A kind of test device and test method of camera module assembly error Download PDFInfo
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- CN108259894A CN108259894A CN201810277897.0A CN201810277897A CN108259894A CN 108259894 A CN108259894 A CN 108259894A CN 201810277897 A CN201810277897 A CN 201810277897A CN 108259894 A CN108259894 A CN 108259894A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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Abstract
The present invention provides a kind of camera module assembly error test device and test method.Wherein, method includes：It obtains in the test image that camera takes, the position where the picture point of the first test sample on the first test chart model, as first position；Judge whether the first position overlaps with the central point of the test image；It is if misaligned, the type of the camera and assembly error existing for camera pedestal in the camera module is then determined to the position in the test image according to the reference test sample of at least one set of test sample centering on the first test chart model.The present invention can accurately be detected the assembly precision of camera and camera pedestal.
Description
Technical field
The present invention relates to camera module mounting technology field more particularly to a kind of tests of camera module assembly error
Device and test method.
Background technology
At present, camera is employed in many optical tracking systems as main or auxiliary element, to utilize camera
Optical property realize to target carry out position tracking.For example, in virtual reality (Virtual Reality, VR) product, it can
At VR it is aobvious on camera module is installed, camera module is allowed to detect VR aobvious external environments and is changed, then by computer or
Other algorithm chips of person calculate VR aobvious spatial positions.
In above application scene, to ensure that optical tracking system has higher tracking accuracy, the assembling essence of camera
Degree is particularly important.Therefore, a kind of method that assembly error to camera module is tested urgently proposes.
Invention content
The present invention provides a kind of test device and test method of camera module assembly error, to accurately to camera shooting
The assembly precision of camera and camera pedestal in head mould group is detected.
The present invention provides a kind of test method of camera module assembly error, including：Camera module to be tested, it is described
Camera module to be tested includes：Camera pedestal and camera；Set on the light direction of the camera module, and with institute
State the first parallel test chart model of camera pedestal；And the processor being electrically connected with the camera；Wherein, described
One test chart model includes the first test sample and at least one set of test sample across the central shaft of the camera pedestal
It is right；Wherein, one group of test sample is to including：With first test sample on the same line, and to first test specimens
Identical two test samples of distance of point；The processor, for according to first test sample and/or it is described at least
One group of test sample determines in the camera module to be tested position in the test image that is taken in the camera
The camera and the camera pedestal assembly error type and/or error amount.
Still optionally further, described device further includes：Between the camera and the first test chart model, and
The second test chart model parallel with the first test chart model；The second test chart model is light transmission pattern plate, and is wrapped
The second test sample containing the central shaft across the camera pedestal.
Still optionally further, one group of test sample pair is included on the first test chart model；One group of test sample
To can be rotated on the first test chart model around first test sample；Or, it is included on the first test chart model
Multigroup test sample pair；Multigroup test sample is distributed in all directions on the first test chart model.
The present invention also provides a kind of test method of camera module assembly error, including：It obtains in camera module
In the test image that camera takes, the position where the picture point of the first test sample on the first test chart model, as
First position；Judge whether the first position overlaps with the central point of the test image；If misaligned, according to described
The reference test sample of at least one set of test sample centering on one test chart model is to the position in the test image, really
The type and/or error amount of the camera and assembly error existing for camera pedestal in the fixed camera module.
Still optionally further, it is tested according to the reference of at least one set of test sample centering on the first test chart model
Sampling point determines that the camera in the camera module exists with camera pedestal to the position in the test image
Assembly error type and/or error amount, including：Obtain at least one set of test sample pair on the first test chart model
Position in the test image；Judge at least one set of test sample centering, the reference test sample on assigned direction
To whether meeting setting condition；The setting condition is：Detect two test samples of test sample centering in the test
The distance of position to the first position in image is unequal；If satisfied, then determine the camera and camera pedestal
There are heeling errors for assembling.
Still optionally further, the method further includes：According to the first position and/or the reference test sample in institute
State the location determination heeling error value in test image.
Still optionally further, the method further includes：If it is described with reference to test sample to being unsatisfactory for the setting condition,
It obtains in the test image, the position where the picture point of the second test sample on the second test chart model, as second
It puts；If the second position is overlapped with the first position, it is determined that the assembling of the camera and the camera pedestal is deposited
In heeling error.
Still optionally further, the method further includes：According to the first position relative to in the test image
The offset direction of heart point and/or it is described with reference to test sample to the position on the first test chart model, determine described take the photograph
As the inclined direction of head.
Still optionally further, the method further includes：If the second position and the first position are misaligned, it is determined that
There are translation errors for the assembling of the camera and the camera pedestal.
Still optionally further, the method further includes：According to the first position relative to in the test image
The offset direction of heart point determines the translation direction of the camera；And/or it is surveyed according to the first position and/or the reference
Sample point is to the location determination translation error value in the test image.
In the present invention, for detecting in the test device of CCD camera assembly assembly error, in addition to CCD camera assembly to be tested
Except, the first test chart model and processor are additionally arranged, apparatus structure is simple and at low cost.It is included on first test chart model
The first test sample and at least one set of test sample pair across the central shaft of camera pedestal, by analyzing to be detected take the photograph
As the corresponding picture point of above-mentioned test sample that head takes, can accurately detect be between camera and camera pedestal
It is no there are assembly error, the type and error amount of assembly error realize camera and the assembly error of camera pedestal
High-precision detects.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments, for those of ordinary skill in the art, without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structure diagram of the test device of camera module assembly error that one embodiment of the invention provides；
Fig. 2 is the light path schematic diagram when camera module that one embodiment of the invention provides assembles error free；
Fig. 3 be one embodiment of the invention provide camera module assembling there are light path schematic diagrams during translation error；
Fig. 4 be one embodiment of the invention provide camera module assembling there are light path schematic diagrams during heeling error；
Fig. 5 is the light path schematic diagram when camera module that another embodiment of the present invention provides assembles error free；
Fig. 6 be another embodiment of the present invention provide camera module assembling there are light path schematic diagrams during translation error；
Fig. 7 be another embodiment of the present invention provide camera module assembling there are light path schematic diagrams during heeling error；
Fig. 8 a are the structure diagram of the first test chart model 12 that one embodiment of the invention provides；
Fig. 8 b are the structure diagram of the first test chart model 12 that another embodiment of the present invention provides；
Fig. 9 is the method flow diagram of the test method of camera module assembly error that one embodiment of the invention provides；
Figure 10 is the method flow diagram of the test method of camera module assembly error that another embodiment of the present invention provides.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiments obtained without creative efforts shall fall within the protection scope of the present invention.
Fig. 1 is the structure diagram of the test device of camera module assembly error that one embodiment of the invention provides, such as
Shown in Fig. 1, which includes：Camera module to be tested 00, the first test chart being made of camera pedestal 10, camera 11
Model 12 and processor 13.
As shown in Figure 1, the first test chart model 12 be set on camera module 00 light direction, and with camera pedestal 10
It is arranged in parallel.That is, the central axis that camera pedestal 10 is surveyed is in test chart model 12.Processor 13 and camera 11
Electrical connection.Wherein, the first test chart model 12 includes the first test sample across the central shaft Axis1 of camera pedestal 10,
Point B as shown in Figure 1 and at least one set of test sample pair；Wherein, one group of test sample is to including：With the first test sample B
On the same line, and to two identical test samples of the distance of the first test sample B, point A as shown in Figure 1 and point C.
In detection device shown in Fig. 1, camera pedestal 10 and camera 11 in camera module 00 to be tested
In assembled state, in addition to camera module 00 to be tested, the first test chart model 12 and processor 13, device knot need to be added
Structure is simple, and at low cost.Camera pedestal 10 can be process by plastics or other possible materials, be imaged for fixed
First 11.Processor 13, for according to the first test sample B and/or at least one set of test sample to being shot in camera 11
To test image in position, determine the type of the assembly error of camera 11 and camera pedestal 10.Wherein, processor 13
Various application specific integrated circuits (ASIC), digital signal processor (DSP), digital signal processing appts can be used
(DSPD), programmable logic device (PLD), field programmable gate array (FPGA), micro- middle control element, microprocessor or other electricity
Subcomponent and its external circuit are realized.It should be noted that the camera 11 that the present invention is previously mentioned includes：It is coaxial and what is set be used for
Imaging and the camera lens focused and the imaging sensor for converting images into electric signal；And for power supply control, signal
Transmission and external interface circuit board.Wherein, processor 13 can be electrically connected by the circuit board with camera 11.
In assembly error test process, camera 11 can shoot the first test chart model 12, obtain test chart
Picture.Test image is imaged corresponding picture point comprising test sample on the imaging sensor of camera.
As shown in Fig. 2, when camera module 00 to be tested is when being assembled without error or minimum error, camera 11 with
Camera pedestal 10 is both without translation or without inclination.In the case that without also nonangular, the central shaft of camera pedestal 10 of translation
Axis1 is overlapped with the optical axis Axis2 of camera 11, and Axis2 is similarly passed through across the first test sample B on Axis1.Needle
For the imaging sensor of camera 11, the point on optical axis images in the central point of imaging sensor, that is to say, that first surveys
Sample point B images in the center of the imaging sensor of camera 11, corresponding picture point B '；One group of test sample A and C are imaged in
The position of distance center point △ H on the imaging sensor of camera 11, corresponding picture point A ' and C '.According to triangle geometrical relationship, △ H
=M*F/L.
Wherein, F is the focal length of camera 11, and M is two test samples of at least one test sample centering to the
The distance of one test sample A, L are the distance that the first test chart model 12 arrives camera 11.That is, being assembled without error
Or error it is minimum when, there are following features：1. the first test sample B images in the centre bit of the imaging sensor of camera 11
It puts；2. the picture point of imaging sensor that the equidistant test sample on the first test chart model is imaged on camera 11 is also into
At equal intervals, i.e. △ H=M*F/L.
Based on features described above, can determine whether between camera 11 and camera pedestal 10 with the presence or absence of translation or heeling error.
When there are (d is the light of camera 11 during the translation error that error amount is d between camera 11 and camera pedestal 10
Axis Axis2 relative to the central shaft Axis1 of camera pedestal 10 deviation), as shown in Figure 3：
First test sample B no longer images in the central point of the imaging sensor of camera 11, but images in deviation
The position of heart point △ B ', corresponding picture point B ', according to geometrical relationship △ B '=d*F/L；A images in distance in described image sensor
The position of central point △ A ', △ A '=(M-d) * F/L, corresponding picture point A '；C images in distance center in described image sensor
The position of point △ C ', △ C '=(M+d) * F/L, corresponding picture point C '.In this case, spacing △ B ' C '=M*F/ of B ', C '
L, A ', the spacing of B ' be also △ A ' B '=M*F/L.That is, there are during translation error d, there is following feature：1. first
Test sample B images in the position for deviateing image sensor center point △ B '；2. the equidistant survey on the first test chart model
Sample point be imaged on the imaging sensor of camera 11 picture point be also into it is equidistant.
When there are (θ is the light of camera 11 during the heeling error that error amount is θ between camera 11 and camera pedestal 10
Axis Axis2 relative to the central shaft Axis1 of camera pedestal 10 rotation angle), as shown in Figure 4：
First test sample B no longer images in the central point of the imaging sensor of camera 11, but images in deviation
The position of heart point △ B ', corresponding picture point B ', according to geometrical relationship △ B '=F*tan θ；Test sample A images in described image biography
The position of distance center point △ A ' on sensor, △ A '=F*tan [θ+arctan (M/L)], corresponding picture point A '；Test sample C into
As in the position of distance center point △ C ' in described image sensor, △ C '=(F*tan [arctan (M/L)-θ], corresponding picture point
C’.In this case, B ', C ' spacing △ B ' C ' be no longer equal to the spacing △ A ' B ' of A ', B '.It is tilted that is, existing
During error theta, there is following feature：1. the first test sample B images in the position for deviateing image sensor center point △ B '；2. the
The picture point that equidistant test sample on one test chart model is imaged on the imaging sensor of camera 11 is not equidistant.
By can obtain to the comparison of Fig. 2, Fig. 3 and Fig. 4, it was concluded that when the first test sample B images in camera
During 11 image sensor center point, it may be determined that there are minimum, insignificant mistakes between camera 11 and camera pedestal 10
Difference.When the first test sample B images in the position for deviateing image sensor center point △ B ', it may be determined that camera 11 and camera shooting
There are translation error or heeling errors between head pedestal 10.Can further be judged by the value of △ B ' specifically there are heeling error or
Translation error or by judge the equidistant test sample on the first test chart model 12 be imaged on camera 11 image pass
Whether the picture point of sensor equidistantly judges that specifically there are heeling error or translation errors.When the picture point is equidistant, determine
There are translation errors, when the picture point is not equidistant, determine that there are heeling errors.Determine exist translation or heeling error it
Afterwards, it can reversely be derived according to △ B ', △ A ' and/or △ C ', to determine actual error value.
In practice, the Pixel Dimensions of the imaging sensor of camera 11 are limited to, when there are during heeling error, first surveys
The spacing attempted between the picture point of imaging sensor that the equidistant test sample on model 12 is imaged on camera 11 compares
It is small, it is not easy to detect.That is the equidistant test sample imaging on the first test chart model 12 is indicated when testing result
When spacing between the picture point of the imaging sensor of camera 11 is equal, it is understood that there may be two kinds of situations, first, the picture point it
Between spacing it is really equal；Second, the spacing between the picture point is unequal, but distance difference is too small, can not be detected,
In this case, it can not determine that there are translation error or heeling errors.For example, by taking heeling error value is 0.05 ° as an example, it is assumed that F
=1.8mm, L=1000mm, M=100mm, then：
△ A '=1.8*tan [0.05 ° of+arctan (100/1000)] ≈ 0.181587
△ C '=1.8*tan [(100/1000) -0.05 ° of arctan] ≈ 0.178414
Assuming that the Pixel Dimensions of the imaging sensor of camera are 3mm, then：
△ A ' ≈ 0.181587*3mm=0.544761mm, △ C ' ≈ 0.178414*3mm=0.535242mm.△ A ' and
0.0095mm is differed between △ C ', this gap is very small, is not easy to differentiate, and testing result is likely to instruction △ A '=△ C '.
Optionally, the present invention provides the test devices of CCD camera assembly assembly error as shown in Figure 5, can not examine
In the case of surveying the spacing between the picture point that equidistant test sample is imaged on the imaging sensor of camera 11, Huo Zhe
Detect the equal situation of spacing between the picture point that equidistant test sample is imaged on the imaging sensor of camera 11
Under, judge that there are translation error or heeling errors between camera 11 and camera pedestal 10.
As shown in figure 5, the test device further includes：Between 11 and first test chart model 12 of camera, and with
The second parallel test chart model 14 of one test chart model 12.Wherein, the second test chart model 14 is light transmission pattern plate so as to take the photograph
The first test image plate 11 can be taken as first 11.It is included on second test chart model 14 across the center of camera pedestal 10
The second test sample B1 of axis Axis1.In Figure 5, the distance of the 14 to the first test chart of the second test chart of label model model 12
For L/X.
As shown in figure 5, when camera 11 is when being assembled without error or minimum error, the second test sample B1 is imaged in
The image sensor center point of camera 11.
When between camera 11 and camera pedestal 10 there are error amount be d translation error when, as shown in fig. 6, second
Test sample B1 images in described image sensor the position for deviateing central point △ B1 ', and corresponding picture point B1 ' is closed according to geometry
It is △ B1 '=X*M*F/L, B1 ' and B ' are misaligned.
When between camera 11 and camera pedestal 10 there are error amount be θ heeling error when, as shown in fig. 7, second
Test sample B1 images in described image sensor the position for deviateing central point △ B1 ', and corresponding picture point B1 ' is closed according to geometry
It is △ B1 '=F*tan θ, that is to say, that B1 ' is overlapped with B '.
Based on Fig. 5, Fig. 6 and Fig. 7, when determining that there are translation error or inclinations between camera 11 and camera pedestal 10
During error, can further pass through B1 ' and B ' whether overlapping judgement, specifically there are heeling error or translation errors.Work as B1 ' and B '
During coincidence, determine that there are heeling errors；When misaligned, determine that there are translation errors.
In an optional embodiment, the first test chart model 12 can be as shown in Figure 8 a.In Fig. 8 a, the first test pattern
Comprising one group of test sample pair on plate 12, and this group of test sample is to can be around the first test specimens on the first test chart model 12
Point A rotates.And then when testing assembly error, the rotatable test sample is to extremely each direction for needing error-detecting, example
Such as, horizontal direction, vertical direction or oblique 45 ° of directions etc., with test camera 11 in all directions whether with camera base
Seat 10 is aligned.In a kind of optional structure, the first test chart model 12 may include the first laminate and the second laminate, the first laminate
There is a test sample A at center, using the central point of the second laminate is that symmetrical centre is equipped with one group of symmetrical test specimens on the second laminate
Point.A shaft is equipped at the test sample A at the first laminate center, a diameter and the shaft are equipped at the second laminate center
The through-hole matched, the second laminate are installed on by the through-hole in the shaft.And then it may be such that the second layer by rotating the second laminate
One group of the first test sample of test sample opposing connection A rotations on plate.
In an optional embodiment, multigroup test sample pair, multigroup test sample are included on the first test chart model 12
It is distributed on each direction for needing error-detecting on the first test chart model 12.For example, horizontal direction, vertical direction or oblique
45 ° of directions, oblique 30 ° of directions etc..Optionally, the first test chart model 12 can be as shown in Figure 8 b.Fig. 8 b are equal with multigroup test sample
It is even be distributed on the first test chart model 12 as signal, it is to be understood that, the embodiment of the present invention to multigroup test sample whether
It is uniformly distributed and is not limited.During assembly error is tested, after determining to need the direction of error-detecting, the party can be obtained
Upward test sample is to the image space on the imaging sensor of camera 11, to detect the camera 11 in this direction
Whether it is aligned with camera pedestal 10.
First test chart model 12 of above two different structure is the optional test chart model of the embodiment of the present invention,
In practice, the embodiment of the present invention is not limited using any.Optionally, as shown in Fig. 8 a and 8b, the first test chart model 12
On test sample can be cross characteristics select, rice font characteristic point, Y-shaped characteristic point, circular feature point or circular ring shape feature
Point etc., the present embodiment is not limited.
In the present embodiment, the first test sample on the first test chart model and at least one set of test sample are to can
It images on the imaging sensor of camera 11, and then can accurately be detected by analyzing the picture point on imaging sensor
Go out between camera and camera pedestal with the presence or absence of assembly error, the type and error amount of assembly error.
The above various embodiments describes the test device of camera module assembly error provided by the invention, with lower part
The test method of camera module assembly error provided by the invention will be specifically introduced with reference to attached drawing.
Fig. 9 is the method flow diagram of the test method of camera module assembly error that one embodiment of the invention provides, and is tied
Fig. 9 is closed, this method includes：
Step 901 is obtained in the test image that the camera in camera module takes, on the first test chart model
Position where the picture point of first test sample, as first position.
Step 902 judges whether the first position overlaps with the central point of the test image；If misaligned, perform
Step 903.
Step 903, the reference test sample according at least one set of test sample centering on the first test chart model
To the position in the test image, the camera in the camera module and group existing for camera pedestal are determined
Fill the type and/or error amount of error.
In the present embodiment, test image is the image that camera takes the first test chart model, the test
Image is imaged corresponding picture point comprising test sample on the imaging sensor of camera.
First position, that is, the first test sample of the central shaft across camera pedestal image in the image of camera
Picture point on sensor.Based on the record in the corresponding embodiments of Fig. 2~Fig. 4, if the central point of first position and test image
It is misaligned, that is to say, that when the first test sample B does not image in image sensor center point, it is determined that camera and camera
There are error between pedestal, error pattern may be heeling error or translation error.
Further, based on the record in the corresponding embodiments of Fig. 2~Fig. 4, can by the first test chart model extremely
The reference test sample of few one group of test sample centering to the position in test image come judge specifically there are heeling error or
Translation error.Wherein, it is selected to judge assembly error to being at least one set of test sample centering with reference to test sample
Test sample pair.For example, it may be at least one set test sample centering, test sample pair in horizontal direction or
Test sample pair on vertical direction.
In the present embodiment, for detecting in the test device of CCD camera assembly assembly error, other than part, it is additionally arranged
One test chart model and processor, apparatus structure are simple and at low cost.It is included on first test chart model across camera base
First test sample of the central shaft of seat and at least one set of test sample pair are taken by analyzing camera to be detected
The corresponding picture point of above-mentioned test sample can accurately detect to miss with the presence or absence of assembling between camera and camera pedestal
Difference, the type and error amount of assembly error realize the high-precision detection of the assembly error of camera.
Above-described embodiment has carried out simple introduction to the test method of camera module assembly error, below in conjunction with attached drawing
It elaborates to the specific implementation of this method.Figure 10 is the camera module assembly error that another embodiment of the present invention provides
The method flow diagram of test method, with reference to Figure 10, this method includes：
Step 1001 is obtained in the test image that camera takes, the first test sample on the first test chart model
Picture point where position, as first position.
Step 1002 judges whether the first position overlaps with the central point of the test image；If misaligned, hold
Row step 1003；If overlap, it is determined that error is not present in the assembling of the camera and camera pedestal.
At least one set of test sample in step 1003, acquisition the first test chart model is in the test image
Position.
Step 1004 judges at least one set of test sample centering, the reference test sample on assigned direction to whether
Meet and impose a condition；The setting condition is：Detect two test samples of test sample centering in the test image
Position to the first position distance it is unequal；If satisfied, perform step 1005；If not satisfied, perform step 1007.
Step 1005, determining the assembling of the camera and camera pedestal, there are heeling errors.
Step 1006, according to the first position and/or the position with reference to test sample in the test image
Determine heeling error value.
Step 1007 is obtained in the test image, where the picture point of the second test sample on the second test chart model
Position, as the second position.
Step 1008 judges whether the second position overlaps with the first position；If overlapping, step is performed
1005；If misaligned, step 1009 is performed.
Step 1009, determining the assembling of the camera and the camera pedestal, there are translation errors.
Step 1010, according to the first position and/or it is described with reference to test sample to the position in the test image
Put determining translation error value.
In step 1002, when first position is overlapped with the central point of test image, that is to say, that the first test sample B into
Picture, then can be as shown in Figure 2 when image sensor center point, it is believed that there is no assemblings between camera and camera pedestal to miss
Difference.
In step 1004, specifically, can determine an assigned direction as error-detecting direction, such as horizontal direction or perpendicular
Nogata to, and using the first upper test sample on the assigned direction of test chart model to as refer to test sample pair.Example
It such as,, can be by one group of survey on the first test chart model after determining assigned direction when the first test chart example edition is shown in Fig. 8 a
Sample point is to rotating to the assigned direction, as with reference to test sample pair.It, can when the first test chart example edition is shown in Fig. 8 b
Using the first upper test sample on the assigned direction of test chart model to as with reference to test sample.With reference to test sample pair
Meet and impose a condition, that is to say, that detect that position of two test samples with reference to test sample centering in test image is arrived
The distance of the first position is unequal, situation as shown in Figure 4.
In step 1005, the record according to Fig. 4 corresponding embodiments, it may be determined that the assembling of camera and camera pedestal is deposited
In heeling error.
In step 1006, after determining there are heeling error, can exist according to first position and/or with reference to test sample
Location determination heeling error value θ in the test image.In this step, following method can be had by calculating θ：
Optionally, according to tan θ1=△ B '/F can be based on first position B ' and calculate △ B ', and then θ=θ1=arctan [△
B’/F]。
Optionally, according to tan [θ2+ arctan (F*M/L)]=△ C '/F, it can be based on reference to wherein one in test sample
Position Cs ' of the point C in test image calculates △ C ', and then θ=θ2=arctan (△ C '/F)-arctan (F*M/L).
Optionally, according to tan [arctan (F*M/L)-θ3]=△ A '/F, can be based on reference to wherein one in test sample
Position As ' of the point A in test image calculates △ A ', and then θ=θ3=arctan (F*M/L)-arctan (△ A '/F).
It optionally, can also be by θ in the present embodiment1、θ2And θ3Average value as heeling error value, that is to say, that θ=
(θ1+θ2+θ3)/3。
Optionally, it can also be determined in this step according to first position relative to the offset direction of the central point with test image
The inclined direction of the camera, it should be understood that inclined direction is in first position and the line side of the central point of test image
Upwards.
It optionally, can also be according to reference to test sample pair in this step if imposing a condition with reference to test sample to meeting
Position on the first test chart model determines the inclined direction of the camera.For example, with reference to test sample to being surveyed first
Attempt to be located at horizontal direction on model, then it is believed that camera is tilted in the horizontal direction.
In step 1007, if with reference to test sample to being unsatisfactory for imposing a condition, it is believed that detecting with reference to test specimens
The distance of position to the first position of two test samples of point centering in test image is equal.In one case,
Such as the record of Fig. 3 corresponding embodiments, it is believed that there are translation error, equidistant test specimens between camera and camera pedestal
It is also equidistant between the picture point of imaging sensor that point is imaged on camera.
In another case, when with reference to test sample to being unsatisfactory for imposing a condition, it is believed that camera and camera
There are heeling error between pedestal, but due to the Pixel Dimensions of the imaging sensor of camera are larger, resolution ratio not enough so that
In can't detect position of two test samples with reference to test sample centering in test image to the first position away from
It is poor from it.In this case, can the record based on Fig. 5~Fig. 7 corresponding embodiments, missed by the second test chart model
Difference detection.When the corresponding second position of the second test sample on the second test chart model and first position are misaligned, such as Fig. 6
Shown situation, then according to the record of Fig. 6 corresponding embodiments, it may be determined that the assembling of camera and camera pedestal has translation and misses
Difference.When the corresponding second position of the second test sample on the second test chart model is overlapped with first position, as shown in Figure 7
Situation, then according to the record of Fig. 7 corresponding embodiments, it may be determined that there are heeling errors for the assembling of camera and camera pedestal.
In step 1010, when determining there are during translation error, can translation error value be calculated according to Similar Principle of Triangle
d.Optionally, according to d/L=△ B '/F, first position B ' can be based on and calculate △ B ', then d=L* △ B '/F.Optionally, according to
(M-d)/L=△ A '/F can calculate △ A ' based on position A ' of the wherein one point A in reference test sample in test image,
Then d=M-L* △ A '/F.Optionally, according to (d+M)/L=△ C '/F, can be existed based on wherein one point C in reference test sample
Position C ' in test image calculates △ C ', then d=L* △ A '/F-M.
Optionally, which further includes：According to first position relative to the offset direction of the central point with test image, really
Determine the translation direction of camera.It should be appreciated that inclined direction is in first position and the line direction of the central point of test image
On.
Optionally, also, to the position on the first test chart model, institute can be determined according to reference to test sample in this step
State the translation direction of camera.For example, with reference to test sample to upper in horizontal direction in the first test chart model, then it is believed that
Camera is translated in the horizontal direction.
It should be noted that in a kind of practical application scene, there is the translation error of more than 1mm in actual assembled process
When, allowance control can be carried out easily.That is, when error detection result instruction assembling, there are the translation errors of more than 1mm
When, directly it can think that the assembly error is as caused by translation error according to engineering experience.Such as in F=1.8mm, L=500mm
Under conditions of, if d=1mm, △ B '=d*F/L=1.8/500=0.0036mm.It is if thinking the range difference of the 0.036mm
As caused by heeling error, then 0.036mm=F*tan θ, θ=arctan (0.0036/1.8)=0.11459 ° are enabled.Namely
It says, caused by error detection result instruction assembling may be considered 1.1458 ° of heeling error there are the translation error of 1mm.It should
Work as understanding, in practice, when error detection result instruction assembles the translation error value there are other numerical value of more than 1mm, with inclination
The substitutional relation of error can be calculated according to the above process, be repeated no more.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
To modify to the technical solution recorded in foregoing embodiments or carry out equivalent replacement to which part technical characteristic；
And these modification or replace, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of test device of camera module assembly error, which is characterized in that including：
Camera module to be tested, the camera module to be tested include：Camera pedestal and camera；It is taken the photograph set on described
As the light direction of head mould group, and the first test chart model parallel with the camera pedestal；It is and electric with the camera
The processor of connection；
Wherein, the first test chart model include across the camera pedestal central shaft the first test sample and
At least one set of test sample pair；Wherein, one group of test sample is to including：With first test sample on the same line, and
Two test samples identical to the distance of first test sample；
The processor, for according to first test sample and/or at least one set of test sample in the camera shooting
Position in the test image that head takes determines the camera in the camera module to be tested and the camera
The type and/or error amount of the assembly error of pedestal.
2. the apparatus according to claim 1, which is characterized in that described device further includes：Set on the camera with it is described
Between first test chart model, and the second test chart model parallel with the first test chart model；
The second test chart model is light transmission pattern plate, and second comprising the central shaft across the camera pedestal tests
Sampling point.
3. the apparatus of claim 2, which is characterized in that one group of test sample is included on the first test chart model
It is right；One group of test sample on the first test chart model around first test sample to can rotate；Or,
Multigroup test sample pair is included on the first test chart model；Multigroup test sample is distributed in first test
In all directions on pattern plate.
4. a kind of test method of camera module assembly error, which is characterized in that including：
It obtains in the test image that the camera in camera module takes, the first test sample on the first test chart model
Picture point where position, as first position；
Judge whether the first position overlaps with the central point of the test image；
If misaligned, according to the reference test sample pair of at least one set of test sample centering on the first test chart model
Position in the test image determines the camera in the camera module and the existing assembling of camera pedestal
The type and/or error amount of error.
5. it according to the method described in claim 4, it is characterized in that, is surveyed according at least one set on the first test chart model
The reference test sample of sample point pair determines the camera shooting in the camera module to the position in the test image
The type and/or error amount of head and assembly error existing for camera pedestal, including：
At least one set of test sample on the first test chart model is obtained to the position in the test image；
Judge at least one set of test sample centering, whether the reference test sample on assigned direction is to meeting setting condition；
The setting condition is：Detect position of two test samples of test sample centering in the test image to described
The distance of one position is unequal；
If satisfied, then there are heeling errors for the assembling of the determining camera and camera pedestal.
6. it according to the method described in claim 5, it is characterized in that, further includes：
If the reference test sample is obtained in the test image, the second test pattern to being unsatisfactory for the setting condition
Position where the picture point of the second test sample on plate, as the second position；
If the second position is overlapped with the first position, it is determined that the assembling of the camera and the camera pedestal is deposited
In heeling error.
7. according to the method described in claim 5, it is characterized in that, the method further includes：
According to the first position relative to the central point with the test image offset direction and/or it is described refer to test specimens
Point determines the inclined direction of the camera to the position on the first test chart model.
8. the method according to any one of claim 5~7, which is characterized in that the method further includes：
According to the first position and/or the location determination heeling error with reference to test sample in the test image
Value.
9. it according to the method described in claim 6, it is characterized in that, further includes：
If the second position and the first position are misaligned, it is determined that the assembling of the camera and the camera pedestal
There are translation errors.
10. it according to the method described in claim 8, it is characterized in that, further includes：
According to the first position relative to the offset direction of the central point with the test image, the flat of the camera is determined
Move direction；And/or
According to the first position and/or it is described with reference to test sample to the location determination translation error in the test image
Value.
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| CN113365045A (en) * | 2020-03-04 | 2021-09-07 | 余姚舜宇智能光学技术有限公司 | Camera module detection method, device and system |
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