CN111595254B - Method and system for measuring axial distance between lens array and LCD display screen - Google Patents
Method and system for measuring axial distance between lens array and LCD display screen Download PDFInfo
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- CN111595254B CN111595254B CN202010499967.4A CN202010499967A CN111595254B CN 111595254 B CN111595254 B CN 111595254B CN 202010499967 A CN202010499967 A CN 202010499967A CN 111595254 B CN111595254 B CN 111595254B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
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- G—PHYSICS
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- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
- G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays
Abstract
The invention discloses a method and a system for measuring the axial distance between a lens array and an LCD display screen. The measuring method comprises the following steps: acquiring an ideal image of a pixel in the LED display screen after passing through a unit lens in a lens array; acquiring two times of imaging of an ideal image by moving a camera in parallel, wherein the imaging is a first imaging and a second imaging; the moving distance of the camera is a first moving distance; determining a pixel variation amount between the first imaging and the second imaging; calculating the distance between the optical center of a lens of the camera and the imaging device; and calculating the axial distance between the LED display screen and the lens array according to the pixel variation, the first moving distance, the pixel size, the distance, the focal length and the distance between the optical center of the lens of the camera and the imaging device. The invention measures the axial distance between the unit lens in the lens array used by the integrated imaging three-dimensional display system and the LCD display screen, provides the actual axial distance and further avoids errors.
Description
Technical Field
The invention relates to the field of integrated imaging, in particular to a method and a system for measuring the axial distance between a lens array and an LCD display screen.
Background
In the integrated imaging three-dimensional display system, the position relationship between pixels on an LCD display screen and unit lenses in a lens array determines the direction information of reconstruction light rays, when the distance between the LCD display screen and the lens array is different from an ideal design value, namely, a distance error (axial error) exists, the space direction of original reconstruction light rays is changed, so that the convergence points of different reconstruction light rays are deviated, and due to the reasons of installation error, system deformation and the like, the real axial distance error cannot be avoided, so that the phenomena of blurring, distortion and the like of the display system occur, and the final display effect is seriously influenced.
Disclosure of Invention
The invention aims to provide a method and a system for measuring the axial distance between a lens array and an LCD display screen, which are used for measuring the axial distance between a unit lens in the lens array and the LCD display screen in an integrated imaging three-dimensional display system, and give the actual axial distance so as to avoid errors.
In order to achieve the purpose, the invention provides the following scheme:
a method for measuring axial distance between a lens array and an LCD display screen comprises the following steps:
acquiring an ideal image of a pixel in the LED display screen after passing through a unit lens in a lens array;
acquiring two times of imaging of the ideal image by moving a camera in parallel, namely a first imaging and a second imaging; the moving distance of the camera is a first moving distance;
determining a pixel variation amount between the first imaging and the second imaging;
calculating the distance between the optical center of the lens of the camera and an imaging device;
acquiring the pixel size of the camera, the distance between the lens array and the camera moving plane and the focal length of the lens array;
and calculating the axial distance between the LED display screen and the lens array according to the pixel variation, the first moving distance, the pixel size, the distance, the focal length and the distance between the optical center of the lens of the camera and an imaging device.
Optionally, the calculating a distance between an optical center of a lens of the camera and the imaging device specifically includes:
arranging two scales which are a first scale and a second scale; the point on the first scale is a first calibration point, and the point on the second scale is a second calibration point; the axial depths of the first calibration point and the second calibration point are different;
acquiring two images of the first calibration point and two images of the second calibration point by moving a camera in parallel; the moving distance of the camera is a second moving distance;
acquiring pixel variation of the first calibration point in two imaging processes, wherein the pixel variation is a first variation;
acquiring pixel variation of the second calibration point in two imaging processes, wherein the pixel variation is a second variation;
obtaining the axial distance difference between the first calibration point and the second calibration point and the pixel size of the camera;
and calculating the distance between the optical center of the lens of the camera and the imaging device according to the axial distance difference, the second moving distance, the pixel size, the first variable quantity and the second variable quantity.
Optionally, a calculation formula of a distance between a lens optical center of the camera and the imaging device is as follows:
wherein G represents a distance between an optical center of a lens of the camera and the imaging device, Δ l represents an axial distance difference between the first calibration point and the second calibration point, μ represents a pixel size of the camera, Δ D' represents a second movement distance of the camera, and Δ N1Pixel variation, Δ N, representing two images of the second index point2The amount of pixel change of the two imaging of the first index point is represented.
Optionally, a calculation formula of an axial distance between the LED display screen and the lens array is as follows:
wherein, grThe axial distance between the LED display screen and the lens array is represented, f represents the focal length of the lens array, L represents the distance between the lens array and the moving plane of the camera, Δ D represents the first moving distance of the camera, G represents the distance between the optical center of a lens of the camera and an imaging device, Δ N represents the pixel variation between the first imaging and the second imaging, and μ represents the pixel size of the camera.
The invention also provides a system for measuring the axial distance between the lens array and the LCD display screen, which comprises:
the first acquisition module is used for acquiring an ideal image of a pixel in the LED display screen after passing through a unit lens in the lens array;
the imaging acquisition module is used for acquiring two times of imaging of the ideal image through the parallel moving camera, namely a first imaging and a second imaging; the moving distance of the camera is a first moving distance;
a pixel variation determining module for determining a pixel variation between the first imaging and the second imaging;
the distance calculation module is used for calculating the distance between the optical center of the lens of the camera and the imaging device;
the second acquisition module is used for acquiring the pixel size of the camera, the distance between the lens array and the camera moving plane and the focal length of the lens array;
and the axial distance calculation module is used for calculating the axial distance between the LED display screen and the lens array according to the pixel variable quantity, the first moving distance, the pixel size, the distance, the focal length and the distance between the optical center of the lens of the camera and an imaging device.
Optionally, the distance calculating module specifically includes:
the setting unit is used for setting two scales which are a first scale and a second scale; the point on the first scale is a first calibration point, and the point on the second scale is a second calibration point; the axial depths of the first calibration point and the second calibration point are different;
the acquisition unit is used for acquiring two times of imaging of the first calibration point and two times of imaging of the second calibration point through the parallel moving camera; the moving distance of the camera is a second moving distance;
a first variation obtaining unit, configured to obtain a pixel variation of two times of imaging of the first calibration point, which is a first variation;
a second variation obtaining unit, configured to obtain a second variation as a second variation of pixel variations of two times of imaging of the second calibration point;
a third obtaining unit, configured to obtain an axial distance difference between the first calibration point and the second calibration point and a pixel size of the camera;
and the distance calculation unit is used for calculating the distance between the optical center of the lens of the camera and the imaging device according to the axial distance difference, the second moving distance, the pixel size, the first variation and the second variation.
Optionally, a calculation formula of a distance between a lens optical center of the camera and the imaging device is as follows:
wherein G represents a distance between an optical center of a lens of the camera and the imaging device, Δ l represents an axial distance difference between the first calibration point and the second calibration point, μ represents a pixel size of the camera, Δ D' represents a second movement distance of the camera, and Δ N1Pixel variation, Δ N, representing two images of the second index point2The amount of pixel change of the two imaging of the first index point is represented.
Optionally, a calculation formula of an axial distance between the LED display screen and the lens array is as follows:
wherein, grThe axial distance between the LED display screen and the lens array is represented, f represents the focal length of the lens array, L represents the distance between the lens array and the moving plane of the camera, Δ D represents the first moving distance of the camera, G represents the distance between the optical center of a lens of the camera and an imaging device, Δ N represents the pixel variation between the first imaging and the second imaging, and μ represents the pixel size of the camera.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: according to the invention, the unit lenses in the lens array are shot at different transverse positions according to the lens imaging principle, the transverse position variation of two times of shooting is recorded, and the imaging displacement of the object point is calculated according to the correlation of the same object point in two times of shooting images, so that the axial distance between the unit lenses and the LCD is calculated, and further, errors are avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a method for measuring an axial distance between a lens array and an LCD panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a method for measuring axial spacing between a lens array and an LCD panel according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating calculation of a distance between a center of a camera lens and an imaging device according to an embodiment of the present invention;
FIG. 4 is a block diagram of an axial distance measurement system for a lens array and an LCD panel according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method and a system for measuring the axial distance between a lens array and an LCD display screen, which are used for measuring the axial distance between a unit lens in the lens array and the LCD display screen in an integrated imaging three-dimensional display system, and give the actual axial distance so as to avoid errors.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the method for measuring the axial distance between the lens array and the LCD display screen includes the following steps:
step 101: and acquiring the ideal image of the pixel in the LED display screen after passing through the unit lens in the lens array.
Step 102: acquiring two times of imaging of the ideal image by moving a camera in parallel, namely a first imaging and a second imaging; the moving distance of the camera is a first moving distance.
Step 103: determining a pixel variation between the first imaging and the second imaging.
Step 104: and calculating the distance between the optical center of the lens of the camera and the imaging device. Specifically, the method comprises the following steps:
arranging two scales which are a first scale and a second scale; the point on the first scale is a first calibration point, and the point on the second scale is a second calibration point; the axial depths of the first calibration point and the second calibration point are different;
acquiring two images of the first calibration point and two images of the second calibration point by moving a camera in parallel; the moving distance of the camera is a second moving distance;
acquiring pixel variation of the first calibration point in two imaging processes, wherein the pixel variation is a first variation;
acquiring pixel variation of the second calibration point in two imaging processes, wherein the pixel variation is a second variation;
obtaining the axial distance difference between the first calibration point and the second calibration point and the pixel size of the camera;
and calculating the distance between the optical center of the lens of the camera and the imaging device according to the axial distance difference, the second moving distance, the pixel size, the first variable quantity and the second variable quantity.
The calculation formula is as follows:
wherein G represents a distance between an optical center of a lens of the camera and the imaging device, Δ l represents an axial distance difference between the first calibration point and the second calibration point, μ represents a pixel size of the camera, Δ D' represents a second movement distance of the camera, and Δ N1Pixel variation, Δ N, representing two images of the second index point2The amount of pixel change of the two imaging of the first index point is represented.
Step 105: acquiring the pixel size of the camera, the distance between the lens array and the camera moving plane and the focal length of the lens array.
Step 106: and calculating the axial distance between the LED display screen and the lens array according to the pixel variation, the first moving distance, the pixel size, the distance, the focal length and the distance between the optical center of the lens of the camera and an imaging device. The calculation formula is as follows:
wherein, grRepresenting the axial distance between the LED display screen and the lens array, f representing the focal length of the lens array, L representing the distance between the lens array and the camera moving plane, Delta D representing the first moving distance of the camera, and G representing the optical center of the lens of the camera and the imagerThe distance between the pieces, Δ N, the amount of pixel change between the first imaging and the second imaging, μ, represents the pixel size of the camera.
The principle of the invention is as follows:
as shown in fig. 2, an ideal image formed in space after a certain pixel O of the LCD panel passes through the unit lens is O ', and assuming that the focal length of the lens is f, the axial distance from the LCD is gr, and the distance between the image O' and the lens is l, it can be known according to the imaging formula:
the pixel position of the image formed by the lens array in the camera at different lateral positions will change, as shown in fig. 2, the distance between the lens array and the moving plane of the camera is L, and the image formed at different shooting positions is O1And O2The moving distance of the two times of shooting by the camera is Δ D, and the following results are obtained:
wherein Δ N is O1And O2The number of pixels of the pixel position variation, μ is the pixel size of the camera, and G is the distance between the optical center of the camera lens and the imaging device.
The two formulas are combined to be easily obtained:
thus, the distance L, O between the lens array and the camera is determined1、O2The axial distance between the unit lens and the LCD display screen can be determined by the pixel number delta N of the image point position variation and the distance G between the center of the camera lens and the imaging device.
The distance G between the optical center of the camera lens and the imaging device cannot be directly obtained in practice. And for the shooting camera position 1 and the shooting camera position 2 with a lateral position difference ad',as shown in FIG. 3, the imaging position P 'in the imaging camera position 1 is determined by considering two points P' and Q 'on the scale 1 and 2 having different axial depths and having an axial distance difference of Δ l between the two points'1、Q′1Imaging position P 'in imaging camera position 2'2、Q′2Easily available of P'1、P′2The variation of pixel position is Δ N1，Q′1、Q′2Pixel position variation amount Δ N of2And then:
finally, grCan be expressed as:
all variables in the above formula can be obtained by actual measurement, and when Δ D ═ Δ D, it can be further simplified as:
as shown in fig. 4, the present invention further provides a system for measuring an axial distance between a lens array and an LCD display screen, the system comprising:
the first obtaining module 401 is configured to obtain an ideal image of a pixel in the LED display screen after passing through a unit lens in the lens array.
An imaging acquisition module 402, configured to acquire two images of the ideal image as a first image and a second image by moving the cameras in parallel; the moving distance of the camera is a first moving distance.
A pixel variation determining module 403, configured to determine a pixel variation between the first imaging and the second imaging.
A distance calculating module 404, configured to calculate a distance between a lens optical center of the camera and the imaging device.
The distance calculating module 404 specifically includes:
the setting unit is used for setting two scales which are a first scale and a second scale; the point on the first scale is a first calibration point, and the point on the second scale is a second calibration point; the axial depths of the first calibration point and the second calibration point are different;
the acquisition unit is used for acquiring two times of imaging of the first calibration point and two times of imaging of the second calibration point through the parallel moving camera; the moving distance of the camera is a second moving distance;
a first variation obtaining unit, configured to obtain a pixel variation of two times of imaging of the first calibration point, which is a first variation;
a second variation obtaining unit, configured to obtain a second variation as a second variation of pixel variations of two times of imaging of the second calibration point;
a third obtaining unit, configured to obtain an axial distance difference between the first calibration point and the second calibration point and a pixel size of the camera;
and the distance calculation unit is used for calculating the distance between the optical center of the lens of the camera and the imaging device according to the axial distance difference, the second moving distance, the pixel size, the first variation and the second variation.
A second obtaining module 405, configured to obtain a pixel size of the camera, a distance between the lens array and the camera moving plane, and a focal length of the lens array.
An axial distance calculating module 406, configured to calculate an axial distance between the LED display screen and the lens array according to the pixel variation, the first moving distance, the pixel size, the distance, the focal length, and a distance between an optical center of a lens of the camera and an imaging device.
The calculation formula of the distance between the lens optical center of the camera and the imaging device is as follows:
wherein G represents a distance between an optical center of a lens of the camera and the imaging device, Δ l represents an axial distance difference between the first calibration point and the second calibration point, μ represents a pixel size of the camera, Δ D' represents a second movement distance of the camera, and Δ N1Pixel variation, Δ N, representing two images of the second index point2The amount of pixel change of the two imaging of the first index point is represented.
The calculation formula of the axial distance between the LED display screen and the lens array is as follows:
wherein, grThe axial distance between the LED display screen and the lens array is represented, f represents the focal length of the lens array, L represents the distance between the lens array and the moving plane of the camera, Δ D represents the first moving distance of the camera, G represents the distance between the optical center of a lens of the camera and an imaging device, Δ N represents the pixel variation between the first imaging and the second imaging, and μ represents the pixel size of the camera.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A method for measuring the axial distance between a lens array and an LCD display screen is characterized by comprising the following steps:
acquiring an ideal image of a pixel in the LED display screen after passing through a unit lens in a lens array;
acquiring two times of imaging of the ideal image by moving a camera in parallel, namely a first imaging and a second imaging; the moving distance of the camera is a first moving distance;
determining a pixel variation amount between the first imaging and the second imaging;
calculating the distance between the optical center of the lens of the camera and an imaging device;
acquiring the pixel size of the camera, the distance between the lens array and the camera moving plane and the focal length of the lens array;
and calculating the axial distance between the LED display screen and the lens array according to the pixel variation, the first moving distance, the pixel size, the distance, the focal length and the distance between the optical center of the lens of the camera and an imaging device.
2. The method for measuring the axial distance between the lens array and the LCD screen according to claim 1, wherein the calculating the distance between the optical center of the lens of the camera and the imaging device specifically comprises:
arranging two scales which are a first scale and a second scale; the point on the first scale is a first calibration point, and the point on the second scale is a second calibration point; the axial depths of the first calibration point and the second calibration point are different;
acquiring two images of the first calibration point and two images of the second calibration point by moving a camera in parallel; the moving distance of the camera is a second moving distance;
acquiring pixel variation of the first calibration point in two imaging processes, wherein the pixel variation is a first variation;
acquiring pixel variation of the second calibration point in two imaging processes, wherein the pixel variation is a second variation;
obtaining the axial distance difference between the first calibration point and the second calibration point and the pixel size of the camera;
and calculating the distance between the optical center of the lens of the camera and the imaging device according to the axial distance difference, the second moving distance, the pixel size, the first variable quantity and the second variable quantity.
3. The method for measuring the axial distance between the lens array and the LCD screen according to claim 2, wherein the calculation formula of the distance between the optical center of the lens of the camera and the imaging device is as follows:
wherein G represents a distance between an optical center of a lens of the camera and the imaging device, Δ l represents an axial distance difference between the first calibration point and the second calibration point, μ represents a pixel size of the camera, Δ D' represents a second movement distance of the camera, and Δ N1Pixel variation, Δ N, representing two images of the second index point2The amount of pixel change of the two imaging of the first index point is represented.
4. The method of claim 2, wherein the axial distance between the LED display screen and the lens array is calculated as follows:
wherein, grRepresenting the axial distance between the LED display screen and the lens array, f representing the focal length of the lens array, L representing the distance between the lens array and the moving plane of the camera, Delta D representing the first moving distance of the camera, G representing the distance between the optical center of the lens of the camera and the imaging device, Delta N representing the pixel variation between the first imaging and the second imaging, and mu representing the image variation of the cameraThe size of the element.
5. A lens array and LCD display screen axial spacing measurement system, said measurement system comprising:
the first acquisition module is used for acquiring an ideal image of a pixel in the LED display screen after passing through a unit lens in the lens array;
the imaging acquisition module is used for acquiring two times of imaging of the ideal image through the parallel moving camera, namely a first imaging and a second imaging; the moving distance of the camera is a first moving distance;
a pixel variation determining module for determining a pixel variation between the first imaging and the second imaging;
the distance calculation module is used for calculating the distance between the optical center of the lens of the camera and the imaging device;
the second acquisition module is used for acquiring the pixel size of the camera, the distance between the lens array and the camera moving plane and the focal length of the lens array;
and the axial distance calculation module is used for calculating the axial distance between the LED display screen and the lens array according to the pixel variable quantity, the first moving distance, the pixel size, the distance, the focal length and the distance between the optical center of the lens of the camera and an imaging device.
6. The system of claim 5, wherein the distance calculation module comprises:
the setting unit is used for setting two scales which are a first scale and a second scale; the point on the first scale is a first calibration point, and the point on the second scale is a second calibration point; the axial depths of the first calibration point and the second calibration point are different;
the acquisition unit is used for acquiring two times of imaging of the first calibration point and two times of imaging of the second calibration point through the parallel moving camera; the moving distance of the camera is a second moving distance;
a first variation obtaining unit, configured to obtain a pixel variation of two times of imaging of the first calibration point, which is a first variation;
a second variation obtaining unit, configured to obtain a second variation as a second variation of pixel variations of two times of imaging of the second calibration point;
a third obtaining unit, configured to obtain an axial distance difference between the first calibration point and the second calibration point and a pixel size of the camera;
and the distance calculation unit is used for calculating the distance between the optical center of the lens of the camera and the imaging device according to the axial distance difference, the second moving distance, the pixel size, the first variation and the second variation.
7. The system of claim 6, wherein the distance between the optical center of the lens of the camera and the imaging device is calculated as follows:
wherein G represents a distance between an optical center of a lens of the camera and the imaging device, Δ l represents an axial distance difference between the first calibration point and the second calibration point, μ represents a pixel size of the camera, Δ D' represents a second movement distance of the camera, and Δ N1Pixel variation, Δ N, representing two images of the second index point2The amount of pixel change of the two imaging of the first index point is represented.
8. The system of claim 6, wherein the axial distance between the LED display screen and the lens array is calculated as follows:
wherein, grThe axial distance between the LED display screen and the lens array is represented, f represents the focal length of the lens array, L represents the distance between the lens array and the moving plane of the camera, Δ D represents the first moving distance of the camera, G represents the distance between the optical center of a lens of the camera and an imaging device, Δ N represents the pixel variation between the first imaging and the second imaging, and μ represents the pixel size of the camera.
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