CN109916341A - A kind of measurement method and system of product surface horizontal tilt angle - Google Patents
A kind of measurement method and system of product surface horizontal tilt angle Download PDFInfo
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- CN109916341A CN109916341A CN201910322040.0A CN201910322040A CN109916341A CN 109916341 A CN109916341 A CN 109916341A CN 201910322040 A CN201910322040 A CN 201910322040A CN 109916341 A CN109916341 A CN 109916341A
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Abstract
The present invention discloses the measurement method and system of a kind of product surface horizontal tilt angle.One specific embodiment of this method includes: that the first direction along product surface to be measured chooses two test points identical with the center actual range on product surface to be measured；In the case where centre of surface that the imaging optical axis of known CCD camera focal length and the imaging system of pixel dimension alignment product is to be measured, the surface to be measured of product is imaged in imaging systems, and calculates separately image-forming range of two test points between the imaging point on CCD camera imaging plane and CCD camera imaging plane central point along first direction；The tilt angle of product surface to be measured in a first direction is calculated in the image-forming range of two test points according to the focal length of CCD camera and pixel dimension and along first direction.The embodiment measurement accuracy is high and measurement efficiency is high.
Description
Technical field
The present invention relates to products to measure the field of test technology.More particularly, to a kind of product surface horizontal tilt angle
Measurement method and system.
Background technique
Currently, the tilt angle of the display screen of measurement electronic equipment such as mobile phone, the mode of horizontal distance mainly make
Use laser triangulation.But this mode can not install the ring of laser in no laser conditions or the test space
There are very big inconveniences under border.
Other than the mode of above-mentioned laser triangulation, existed using mechanical or electronic measuring instrument plane survey
Two aspect problems: the first, measurement accuracy is low；The second, measurement efficiency is low, cannot accomplish area while horizontal plane X-axis and Y direction
It does not measure, wherein need to expend more time and human cost if repeatedly mechanical measurement.
Accordingly, it is desirable to provide a kind of measurement method and system of new product surface horizontal tilt angle.
Summary of the invention
The purpose of the present invention is to provide the measurement methods and system of a kind of new product surface horizontal tilt angle, with solution
At least one of problem certainly of the existing technology.
In order to achieve the above objectives, the present invention adopts the following technical solutions:
First aspect present invention provides a kind of measurement method of product surface horizontal tilt angle, this method comprises:
First direction selection two along product surface to be measured is identical as the center actual range on product surface to be measured
Test point；
The imaging optical axis of known CCD camera focal length and the imaging system of pixel dimension is being directed at product centre of surface to be measured
In the case where, the surface to be measured of the product is imaged in the imaging system, and calculate separately two along first direction
Image-forming range of the test point between the imaging point on CCD camera imaging plane and CCD camera imaging plane central point；
According to the imaging of the focal length of the CCD camera and pixel dimension and two test points along first direction
The tilt angle of product surface to be measured in a first direction is calculated in distance.
Optionally, the first direction along product surface to be measured chooses two center realities with product surface to be measured
Border further comprises apart from identical test point: the first direction along product surface to be measured chooses two and product table to be measured
The center actual range in face is identical and is located at the test point of the marginal position on product surface to be measured.
Optionally, the focal length and pixel dimension according to the CCD camera and two tests along first direction
The image-forming range of point, the tilt angle of product surface to be measured in a first direction, which is calculated, further comprises: according to following
The tilt angle of product surface to be measured in a first direction is calculated in formula:
Wherein, θ1For the tilt angle of product surface to be measured in a first direction；F is CCD camera focal length；L1And L2Respectively
Two test points along first direction are between the imaging point on CCD camera imaging plane and CCD camera imaging plane central point
Image-forming range, WithRespectively exist along two test points of first direction
Pixel distance between imaging point on CCD camera imaging plane and CCD camera imaging plane central point, r are the picture of CCD camera
Elemental size.
Optionally, this method further include:
First direction along product surface to be measured chooses multiple groups test point, and every group of test point includes two and wait for the product
Survey the identical test point of center actual range on surface；
Calculate separately imaging point of each test point along first direction on CCD camera imaging plane and CCD camera at
As the image-forming range between planar central point；
According to the focal length of the CCD camera and pixel dimension and along first direction every group of test point the imaging away from
From being calculated the tilt angle of the corresponding product surface to be measured of every group of test point in a first direction, and by every group of test point pair
Inclination angle of the mean value of the tilt angle of the product answered surface to be measured in a first direction as product surface to be measured in a first direction
Degree.
Optionally, this method further include:
The first direction along product surface to be measured choose two with the center on product surface to be measured actually away from
While from identical test point, the center of two with product surface to be measured are chosen along the second direction on product surface to be measured
The identical test point of actual range；
In imaging point and CCD of two test points calculated separately along first direction on CCD camera imaging plane
While image-forming range between camera imaging planar central point, two test points in a second direction are calculated separately in CCD phase
Image-forming range between imaging point on machine imaging plane and CCD camera imaging plane central point；
While the tilt angle that product surface to be measured is calculated in a first direction, according to the CCD camera
Focal length and pixel dimension and the two in a second direction test point the image-forming range, product table to be measured is calculated
Tilt angle of the face in second direction.
Optionally, the second direction is perpendicular to the first direction.
Optionally, product surface to be measured is rectangle, and the first direction is parallel to rectangular long side, described the
Two are oriented parallel to rectangular short side.
Optionally, test point is chosen to product surface to be measured using standard picture.
The product surface level that second aspect of the present invention provides a kind of method that execution first aspect present invention provides is inclined
The measuring system of rake angle, the system include:
For carrying the measuring table of product；
CCD camera for product surface to be measured to be imaged；And
For calculate imaging point of two test points along first direction on CCD camera imaging plane and CCD camera at
As the image-forming range between planar central point, and according to the focal length of the CCD camera and pixel dimension and described along first direction
Two test points the image-forming range, the data processing of the tilt angle of product surface to be measured in a first direction is calculated
Unit.
Optionally, system further include: for storing the known focal length of CCD camera and the storage unit of pixel dimension.
Beneficial effects of the present invention are as follows:
High-precision, efficient product surface can be realized using the vision system of one camera in technical solution of the present invention
Horizontal tilt angle measurement.Further, due to without carrying out preparatory vision calibration, it is easy to accomplish and it is wider to be applicable in scene.Separately
Outside, can be by once based on the measurement of imaging, while product surface is calculated respectively along the tilt angle of X-axis and Y direction.
Technical solution of the present invention is such as right especially suitable for the large scale test assembly line for the product having higher requirements to flatness
Large scale test assembly line of the display screen of the electronic equipments such as mobile phone etc..
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing；
Fig. 1 shows the flow chart of the measurement method of product surface horizontal tilt angle provided in an embodiment of the present invention.
Fig. 2 shows the imaging optical path schematic diagrames of CCD camera.
Fig. 3 shows the interface screenshot of measurement result.
Fig. 4 shows the schematic diagram of the measuring system of product surface horizontal tilt angle provided in an embodiment of the present invention.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
As shown in Figure 1, An embodiment provides a kind of measurement method of product surface horizontal tilt angle,
This method comprises:
First direction selection two along product surface to be measured is identical as the center actual range on product surface to be measured
Test point；
The imaging optical axis of known CCD camera focal length and the imaging system of pixel dimension is being directed at product centre of surface to be measured
In the case where, the surface to be measured of the product is imaged in the imaging system, and calculate separately two along first direction
Image-forming range of the test point between the imaging point on CCD camera imaging plane and CCD camera imaging plane central point；
According to the imaging of the focal length of the CCD camera and pixel dimension and two test points along first direction
The tilt angle of product surface to be measured in a first direction is calculated in distance.
Wherein, tight shot can be used in CCD camera, can also be by existing a variety of if what is used is not tight shot
Mode obtains the focal length of CCD camera.The pixel dimension of CCD camera, the pixel dimension of the sensitive chip of CCD camera in other words can
Directly obtained from the cameras specification introduction such as parameter declaration book of such as CCD camera.In addition, imaging optical axis is directed at product table to be measured
The deviation for allowing to have several pixels when the center of face, but deviation should be less than the 1/4 of the diameter of pixel, to guarantee the essence of measurement
Degree.
The measurement method of product surface horizontal tilt angle provided in this embodiment, utilizes the vision system of one camera
Realize high-precision, the measurement of efficient product surface horizontal tilt angle.Further, due to without carrying out preparatory vision mark
It is fixed, it is easy to accomplish and it is wider to be applicable in scene.
In some optional implementations of the present embodiment, the first direction along product surface to be measured chooses two
Test point identical with the center actual range on product surface to be measured further comprises: the first party along product surface to be measured
It is identical as the center actual range on product surface to be measured and be located at the side on product surface to be measured to choosing two
The test point of edge position.Selecting test point is advantageously ensured that into measurement essence in the implementation of the marginal position on product surface to be measured
The measurement method of product surface horizontal tilt angle provided in this embodiment is further being applied to measure batch for example by degree
When the display screen of the electronic equipments such as mobile phone, since display screen is rigidity, at it there are in the case where horizontal tilt angle,
The X-axis of different zones or the tilt angle of Y direction are also almost the same.Therefore this implementation is convenient for selection and display screen
Identical two test points of center actual range, directly selection display screen is at two of the edges at two ends position of X-axis or Y direction
Point can guarantee that two test points are identical as the center actual range of display screen as test point.
In some optional implementations of the present embodiment, the focal length and pixel dimension according to the CCD camera
With the image-forming range of two test points along first direction, product surface to be measured inclining in a first direction is calculated
Rake angle further comprises: the tilt angle of product surface to be measured in a first direction is calculated according to following formula:
Wherein, θ1For the tilt angle of product surface to be measured in a first direction；F is CCD camera focal length；L1And L2Respectively
Two test points along first direction are between the imaging point on CCD camera imaging plane and CCD camera imaging plane central point
Image-forming range, WithRespectively exist along two test points of first direction
Pixel distance between imaging point on CCD camera imaging plane and CCD camera imaging plane central point, r are the picture of CCD camera
Elemental size.
Using this optional way, can ingenious land productivity CCD camera optical imagery geometrical principle, be detached from two test points
Actual range and merely with imaging point of two test points on CCD camera imaging plane and CCD camera imaging plane central point
Between image-forming range, product surface to be measured can be calculated in a first direction in conjunction with the focal length and pixel dimension of CCD camera
Tilt angle.
The principle of above-mentioned formula is illustrated by following specific examples:
As shown in Fig. 2, being respectively A and B, test point A there are two test points on the product of tilt angle surface to be measured
Be respectively imaging point C and imaging point D with imaging point of the test point B on CCD camera imaging plane, in this example, test point A away from
It is closer from CCD camera imaging plane, so the distance between the imaging point C of test point A and CCD camera imaging plane central point F
The distance between imaging point D and CCD camera imaging plane central point F of the FC greater than test point B FD.
It is available by geometrical relationship:
I.e.Wherein, f be CCD camera focal length, i.e. CCD camera imaging plane central point F with
The distance between CCD camera optical center point O FO；L is that test point A and the horizontal distance of product centre of surface E to be measured (are tested
Point A and test point A distance AA` between the floor projection point A` in CCD camera imaging optical axis), it will be understood that, test point
Horizontal distance (the i.e. horizontal throwing of test point B and test point B in CCD camera imaging optical axis of B and product centre of surface E to be measured
The distance between shadow point B` BB`) it is similarly L；OA` is that CCD camera optical center point O (center non-visual field FOV) and test point A exist
The distance between floor projection point A` in CCD camera imaging optical axis；
I.e.Wherein, OB` is CCD camera optical center point O and test point B in CCD camera
The distance between floor projection point B` in imaging optical axis；
A`B`=M*sin θ1,Wherein, A`B` is level of the test point A in CCD camera imaging optical axis
Subpoint A` and test point B between the floor projection point B` in CCD camera imaging optical axis at a distance from, M be test point A and test
Actual range between point B, θ1For the tilt angle of product surface to be measured in a first direction；
Then it can be obtained:I.e.
Wherein, Between imaging point C and the F of CCD camera imaging plane central point
Pixel distance,For the pixel distance between imaging point D and the F of CCD camera imaging plane central point, pixel distance
WithIt can be obtained respectively by existing image measuring method；R is the pixel dimension of CCD camera.
In some optional implementations of the present embodiment, product surface horizontal tilt angle provided in this embodiment
Measurement method further include:
First direction along product surface to be measured chooses multiple groups test point, and every group of test point includes two and wait for the product
Survey the identical test point of center actual range on surface；
Calculate separately imaging point of each test point along first direction on CCD camera imaging plane and CCD camera at
As the image-forming range between planar central point；
According to the focal length of the CCD camera and pixel dimension and along first direction every group of test point the imaging away from
From being calculated the tilt angle of the corresponding product surface to be measured of every group of test point in a first direction, and by every group of test point pair
Inclination angle of the mean value of the tilt angle of the product answered surface to be measured in a first direction as product surface to be measured in a first direction
Degree.
Using this implementation, can based on the multipair test point of first direction, obtain more accurate measurement result,
In some optional implementations of the present embodiment, a kind of product surface horizontal tilt angle provided in this embodiment
The measurement method of degree further include:
The first direction along product surface to be measured choose two with the center on product surface to be measured actually away from
While from identical test point, the center of two with product surface to be measured are chosen along the second direction on product surface to be measured
The identical test point of actual range；
In imaging point and CCD of two test points calculated separately along first direction on CCD camera imaging plane
While image-forming range between camera imaging planar central point, two test points in a second direction are calculated separately in CCD phase
Image-forming range between imaging point on machine imaging plane and CCD camera imaging plane central point；
While the tilt angle that product surface to be measured is calculated in a first direction, according to the CCD camera
Focal length and pixel dimension and the two in a second direction test point the image-forming range, product table to be measured is calculated
Tilt angle of the face in second direction.
Further, the second direction is perpendicular to the first direction.
Can be by once based on the measurement of imaging using this implementation, while product surface is calculated respectively along X-axis
With the tilt angle of Y direction, especially suitable for the large scale test assembly line for the product having higher requirements to flatness, such as
To the large scale test assembly line of display screen etc. of the electronic equipments such as mobile phone.In a specific example, measurement result such as Fig. 3 institute
Show.It will be appreciated that aforementioned measurement product surface to be measured can be used in the tilt angle of second direction in measurement product surface to be measured
The detailed process of tilt angle in a first direction, details are not described herein.
In some optional implementations of the present embodiment, the product surface to be measured is rectangle, the first party
To rectangular long side is parallel to, the second direction is parallel to rectangular short side.
In some optional implementations of the present embodiment, product surface to be measured is chosen using standard picture and is tested
Point.Using this optional way, surveyed convenient for being chosen in the display screen of the electronic equipment such as mobile phone of the identical size of measure batch
Pilot.
As shown in figure 4, another embodiment of the present invention provides a kind of product surface levels for executing the above method to incline
The measuring system of rake angle, the system include:
For carrying the measuring table of product；
CCD camera for product surface to be measured to be imaged；And
For calculate imaging point of two test points along first direction on CCD camera imaging plane and CCD camera at
As the image-forming range between planar central point, and according to the focal length of the CCD camera and pixel dimension and described along first direction
Two test points the image-forming range, the data processing of the tilt angle of product surface to be measured in a first direction is calculated
Unit (not shown).
In some optional implementations of the present embodiment, the system further include: for storing known CCD camera
The storage unit (not shown) of focal length and pixel dimension.It will be appreciated that storage unit can be locally stored for integrated
Equipment or expanding storage apparatus, such as: pluggable storage card, the present embodiment are not especially limited this.
It should be noted that the principle and work of the measuring system of product surface horizontal tilt angle provided in this embodiment
Process is similar to the measurement method of the said goods surface horizontal tilt angle, and related place is referred to above description, herein not
It repeats again.
It should be noted that in the description of the present invention, the terms "include", "comprise" or its any other variant are intended to
Cover non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or setting
Standby intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in the process, method, article or apparatus that includes the element.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention for those of ordinary skill in the art on the basis of the above description can be with
It makes other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to the present invention
The obvious changes or variations extended out of technical solution still in the scope of protection of the present invention.
Claims (10)
1. a kind of measurement method of product surface horizontal tilt angle, which is characterized in that this method comprises:
First direction along product surface to be measured chooses two surveys identical with the center actual range on product surface to be measured
Pilot；
In the feelings that the imaging optical axis of known CCD camera focal length and the imaging system of pixel dimension is aligned to product centre of surface to be measured
Under condition, the surface to be measured of the product is imaged in the imaging system, and calculates separately two tests along first direction
Image-forming range of the point between the imaging point on CCD camera imaging plane and CCD camera imaging plane central point；
According to the imaging of the focal length of the CCD camera and pixel dimension and two test points along first direction away from
From the tilt angle of product surface to be measured in a first direction is calculated.
2. the method according to claim 1, wherein the first direction along product surface to be measured chooses two
Test point identical with the center actual range on product surface to be measured further comprises: the first party along product surface to be measured
It is identical as the center actual range on product surface to be measured and be located at the side on product surface to be measured to choosing two
The test point of edge position.
3. the method according to claim 1, wherein the focal length and pixel dimension according to the CCD camera
With the image-forming range of two test points along first direction, product surface to be measured inclining in a first direction is calculated
Rake angle further comprises: the tilt angle of product surface to be measured in a first direction is calculated according to following formula:
Wherein, θ1For the tilt angle of product surface to be measured in a first direction；F is CCD camera focal length；L1And L2Respectively along
Two test points in one direction between the imaging point on CCD camera imaging plane and CCD camera imaging plane central point at
Image distance from, WithRespectively along two test points of first direction in CCD phase
Pixel distance between imaging point on machine imaging plane and CCD camera imaging plane central point, r are the pixel ruler of CCD camera
It is very little.
4. the method according to claim 1, wherein this method further include:
First direction along product surface to be measured chooses multiple groups test point, and every group of test point includes two and product table to be measured
The identical test point of center actual range in face；
It is flat to calculate separately imaging point and CCD camera imaging of each test point along first direction on CCD camera imaging plane
Image-forming range between the central point of face；
The image-forming range of every group of test point according to the focal length of the CCD camera and pixel dimension and along first direction, meter
Calculation obtains the tilt angle of the corresponding product surface to be measured of every group of test point in a first direction, and by the corresponding production of every group of test point
Tilt angle of the mean value of the tilt angle of product surface to be measured in a first direction as product surface to be measured in a first direction.
5. the method according to claim 1, wherein this method further include:
The center actual range phase of two with product surface to be measured are chosen in the first direction along product surface to be measured
With test point while, the second direction along product surface to be measured chooses two and the center on product surface to be measured reality
Apart from identical test point；
In imaging point and CCD camera of two test points calculated separately along first direction on CCD camera imaging plane
While image-forming range between imaging plane central point, calculate separately two test points in a second direction CCD camera at
As the image-forming range between the imaging point in plane and CCD camera imaging plane central point；
While the tilt angle that product surface to be measured is calculated in a first direction, according to the coke of the CCD camera
Away from and pixel dimension and the two in a second direction test point the image-forming range, product surface to be measured is calculated and exists
The tilt angle of second direction.
6. according to the method described in claim 5, it is characterized in that, the second direction is perpendicular to the first direction.
7. according to the method described in claim 6, it is characterized in that, product surface to be measured is rectangle, the first party
To rectangular long side is parallel to, the second direction is parallel to rectangular short side.
8. being tested the method according to claim 1, wherein being chosen using standard picture to product surface to be measured
Point.
9. a kind of execute the measuring system such as any one of the claim 1-8 product surface horizontal tilt angle of the method,
It is characterized in that, the system includes:
For carrying the measuring table of product；
CCD camera for product surface to be measured to be imaged；And
It is flat for calculating imaging point and CCD camera imaging of two test points along first direction on CCD camera imaging plane
Image-forming range between the central point of face, and according to the focal length of the CCD camera and pixel dimension and described along the two of first direction
The data processing list of the tilt angle of product surface to be measured in a first direction is calculated in the image-forming range of a test point
Member.
10. the measuring system of product surface horizontal tilt angle according to claim 1, which is characterized in that the system is also
It include: for storing the known focal length of CCD camera and the storage unit of pixel dimension.
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| CN115144164A (en) * | 2022-08-31 | 2022-10-04 | 武汉精立电子技术有限公司 | Method and system for measuring position deviation of display screen |
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