Imaging Difference Evaluation Method, Apparatus and Equipment for Optical System

Abstract

The present application discloses a method, device, and equipment for evaluating imaging differences of an optical system. The method includes: determining a plurality of actual optical performance parameters adapted to the optical system according to the correlation between different pupil diameters D, different eye distances L, and the optical system; taking the value with the largest difference from the theoretical optical performance parameters of the optical system among the plurality of actual optical performance parameters as the target optical performance parameter of the optical system; determining the user usage error parameter of the optical system according to the target optical performance parameter and the theoretical optical performance parameter of the optical system; and judging the imaging differences of the optical system for different users according to the user usage error parameter of the optical system. In the present application, a user usage error parameter of an optical system is designed, which can be used to evaluate the imaging differences of different users using the optical system, so as to judge the imaging quality of the optical system.

Description

Technical Field

[0001] This application relates to the technical field of optical system testing. More specifically, this application relates to a method, apparatus, and device for evaluating imaging differences of an optical system. Background Art

[0002] Before a virtual reality device or an augmented reality device is put into use, it is necessary to measure the near-eye display optical system therein. In the existing related technologies, usually the optical performance parameters of the optical system under the design values are measured to evaluate the performance of the optical system.

[0003] However, the differences in the human eye structures of users will result in different experience feelings when different users use the same optical system. The differences in the human eye structures include, for example, the pupil size (i.e., the change in the pupil size) automatically adjusted by the human eye according to the light intensity, and the different distances from the human eye to the VR device due to different depths of the eye sockets. Based on this, only measuring the optical performance parameters of the optical system under the design values cannot truly evaluate the performance of the optical system, because this cannot reflect the imaging differences of the optical system for different users. Summary of the Invention

[0004] The purpose of this application is to provide a new technical solution for a method, apparatus, and device for evaluating imaging differences of an optical system, which can be used to evaluate the imaging differences of the optical system for different users, and thus can reflect the performance of the optical system.

[0005] In a first aspect, an embodiment of this application provides a method for evaluating imaging differences of an optical system, and the method includes:

[0006] Determine a plurality of actual optical performance parameters adapted to the optical system according to the correlation relationships between different pupil diameters D, different eye distances L, and the optical system; wherein, the eye distance L is the distance between the human eye and the outermost lens in the optical system;

[0007] Take the value with the largest difference from the theoretical optical performance parameters of the optical system among the plurality of actual optical performance parameters as the target optical performance parameter of the optical system;

[0008] Determine the user usage error parameter of the optical system according to the target optical performance parameter and the theoretical optical performance parameter of the optical system;

[0009] Judge the imaging differences of the optical system for different users according to the user usage error parameter of the optical system.

[0010] Optionally, the optical performance parameters of the optical system include at least one of modulation transfer function MTF, field of view FOV, lateral chromatic aberration LCA, and distortion.

[0011] Optionally, the pupil diameter D is: 2 mm ≤ D ≤ 4 mm.

[0012] Optionally, the eye distance L is: 10 mm ≤ L ≤ 20 mm.

[0013] Optionally, the user usage error parameter of the optical system is: the ratio of the difference between the target optical performance parameter of the optical system and the theoretical optical performance parameter of the optical system to the theoretical optical performance parameter of the optical system.

[0014] Optionally, the method further includes: when the user usage error parameter of the optical system is less than the set error parameter, determining that the imaging differences of the optical system for different users are small.

[0015] Optionally, the optical system is a folded optical path system.

[0016] In a second aspect, an embodiment of the present application provides an imaging difference evaluation device for an optical system, and the device includes:

[0017] A first determination module, configured to determine a plurality of actual optical performance parameters adapted to the optical system according to the association relationship between different pupil diameters D and different eye distances L and the optical system; wherein, the eye distance L is the distance between the human eye and the outermost lens in the optical system;

[0018] A comparison module, configured to use the value with the largest difference from the theoretical optical performance parameter of the optical system among the plurality of actual optical performance parameters as the target optical performance parameter of the optical system;

[0019] A second determination module, configured to determine the user usage error parameter of the optical system according to the target optical performance parameter of the optical system and the theoretical optical performance parameter of the optical system;

[0020] A judgment module, configured to judge the imaging differences of the optical system for different users according to the user usage error parameter of the optical system.

[0021] In a third aspect, an embodiment of the present application provides an imaging difference evaluation device for an optical system, and the device includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps of the above-mentioned imaging difference evaluation method for the optical system are implemented.

[0022] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, and a computer program is stored on the computer storage medium. When the computer program is executed by a processor, the steps of the above-mentioned imaging difference evaluation method for the optical system are implemented.

[0023] The beneficial effects of the present application are as follows:

[0024] In the solution of the embodiment of the present application, a user usage error parameter of an optical system is proposed, which is defined as the maximum difference in the optical performance parameters of the optical system caused by the variation of the pupil size D and the distance L from the human eye to the outermost lens of the optical system within a limited range. Through the user usage error parameter of the optical system, the tolerance of the optical system to different users can be quantitatively evaluated, that is, it can be used to evaluate the imaging differences of different users using the optical system, so as to accurately judge the performance of the optical system.

[0025] Other features and advantages of the present application will become clear from the following detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings incorporated in and forming a part of this specification illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application.

[0027] Figure 1 is a flowchart of a method for evaluating imaging differences of an optical system according to an embodiment of the present application;

[0028] Figure 2 is one of the schematic structural diagrams of the optical system according to an embodiment of the present application;

[0029] Figure 3 is Figure 2 the modulation transfer function curve of the optical system shown;

[0030] Figure 4 is another schematic structural diagram of the optical system according to an embodiment of the present application;

[0031] Figure 5 is the block schematic diagram of an imaging difference evaluation device provided by an embodiment of the present application;

[0032] Figure 6 is the schematic hardware structure of an imaging difference evaluation device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] Now, various exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present application.

[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or its use.

[0035] Techniques, methods, and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be regarded as part of the specification.

[0036] In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0037] It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof in subsequent figures is not required.

[0038] The following will Figures 1 to 6 describe in detail the imaging difference evaluation method, device, equipment, and computer-readable storage medium provided by the embodiments of the present application.

[0039] <Method Embodiment>

[0040] The imaging difference evaluation method of the optical system provided by the embodiments of the present application can be used to evaluate the imaging differences of the optical system for different users, and thus can reflect the performance of the optical system. It can be determined whether the optical system meets the production requirements.

[0041] According to an embodiment of the present application, the imaging difference evaluation method of the optical system may include the following steps S110 to S140, as shown in Figure 1 shown.

[0042] Step S110: Determine a plurality of actual optical performance parameters adapted to the optical system according to the correlation between different pupil diameters D and different eye distances L and the optical system; wherein, the eye distance L is the distance between the human eye and the outermost lens in the optical system.

[0043] In this embodiment, the optical system in the above step S110 is the optical system to be measured, which may be, for example, a near-eye display optical system applied to a VR device. Figure 2 shows a schematic structural diagram of the optical system, which may be, for example, a folded optical path optical system.

[0044] It should be noted that the imaging difference evaluation method of the embodiments of the present application includes but is not limited to measuring the optical system shown in Figure 2 and can also evaluate optical systems with other optical structures, and the embodiments of the present application do not limit this.

[0045] In one example, as Figure 2As shown, the optical system sequentially includes a diaphragm 30, a lens group, and a display screen 10 along the same optical axis. Among them, the lens group is located between the diaphragm 30 and the display screen 10. The lens group may include, for example, a single lens, that is Figure 2 the first lens 20 shown in Figure 2 . A beam splitting element 40 is provided on the surface of the first lens 20 close to the display screen 10 (the rear surface 22), and a first phase retarder 50 and a first polarization reflection element 60 are provided on the surface of the first lens 20 away from the display screen 10 (the front surface 21). Among them, the first phase retarder 50 is located between the beam splitting element 40 and the first polarization reflection element 60. A second polarization reflection element 70 and a second phase retarder 80 are stacked on the light-emitting surface of the display screen 10. The optical system formed in this way is a folded optical path (pancake) single-lens optical system.

[0046] The folded optical path (pancake) single-lens optical system is easy to design and process, and the folded optical path can better achieve thinness and lightness. Therefore, it is widely used in VR devices. In this embodiment, the imaging difference evaluation method is described by taking the folded optical path (pancake) single-lens optical system as an example.

[0047] Figure 2 For the shown folded optical path (pancake) single-lens optical system, the light propagation path is as follows:

[0048] The imaging light rays emitted by the display screen 10 pass through the second polarization reflection element 70 and the second phase retarder 80 on the display screen 10 in sequence and then become circularly polarized light. In the first lens 20, they pass through the beam splitting element 40, the first lens 20, and the first phase retarder 50 in sequence and then become linearly polarized light. Reflection occurs at the first polarization reflection element 60. The reflected light rays pass through the first phase retarder 50 and then become circularly polarized light with a rotation state opposite to that of the initial circularly polarized light. After passing through the first lens 20 and the beam splitting element 40 in sequence, reflection occurs. The reflected light rays pass through the first lens 20 and the first phase retarder 50 in sequence and then become linearly polarized light with a polarization direction perpendicular to that of the linearly polarized light that first arrives. Transmission occurs at the first polarization reflection element 60, and the outgoing light rays are transmitted to the diaphragm 30 for imaging by the human eye 01.

[0049] Among them, the diaphragm 30 acts as an aperture stop to control the amount of light passing through, thereby adjusting the light flux of the above optical system and reducing the influence of non-imaging light rays.

[0050] Among them, the surface of the first lens 20 away from the display screen 10 is a plane, and the surface close to the display screen 10 is an aspherical surface. The first phase retarder 50 is a quarter-wave plate film, and the first polarization reflection element 60 is an APF film. The two can be stacked and jointly attached to the surface of the first lens 20 away from the display screen 10, and the APF film is the outer layer. Since the surface of the first lens 20 away from the display screen 10 is designed as a plane, it is beneficial to mount the film thereon, which can reduce the mounting difficulty. The beam splitter element 40 is a semi-reflective and semi-transmissive film, which can be attached or coated on the surface of the first lens 20 close to the display screen 10.

[0051] For Figure 2 the optical system shown, for example, the value of the pupil diameter D is designed to be 4 mm, and the distance from the human eye 01 to the outermost lens (the first lens 20) of the optical system, that is, the eye distance L, is designed to be 13 mm. According to the correlation between the D value and the L value and the optical system, the theoretical optical performance parameters of the optical system can be obtained. For example, the theoretical modulation transfer function of the optical system.

[0052] In one example, as Figure 3 shown, Figure 3 when the pupil diameter D is 4 mm and the distance from the human eye to the outermost lens (the first lens 20) of the optical system is 13 mm (that is, the eye distance L is 13 mm), Figure 2 the modulation transfer function (MTF) diagram of the optical system shown is presented. The modulation transfer function (MTF) is the contrast of the image formed by the optical system at different spatial frequencies, which can not only reflect the quality of the image formed by the optical system but also reflect the resolution of the optical system. Figure 3 Shown in it are the meridional and sagittal MTF curves of seven fields of view, and the maximum field of view angle in this embodiment is 90°.

[0053] When different users use the above optical system, due to different users having different pupil diameters D and eye distances L (the distance from the human eye 01 to the outermost lens of the optical system), when different users use the same optical system, different actual modulation transfer functions can be obtained according to the correlation between the pupil diameter D and the eye distance L and the optical module. There may be a certain difference from the theoretical modulation transfer function of the aforementioned optical system.

[0054] In this embodiment, the optical performance parameters of the optical system include at least one of the modulation transfer function MTF, the field of view angle FOV, the lateral chromatic aberration LCA, and the distortion.

[0055] That is to say, in the method for evaluating the imaging difference of the optical system according to the embodiment of the present application, it includes, but is not limited to, using the modulation transfer function MTF as the optical performance parameter, and other parameters such as the field of view angle FOV, lateral chromatic aberration LCA, distortion, etc. described above can also be used as the optical performance parameters. Moreover, the optical performance parameters can be more than one. When multiple optical performance parameters are used, the performance evaluation of the optical system can be more accurate.

[0056] In this embodiment, in the above step S110, the pupil diameter D is: 2 mm ≤ D ≤ 4 mm.

[0057] The range of the above-mentioned pupil diameter D can cover the pupil sizes of all people.

[0058] In this embodiment, the eye distance L is: 10 mm ≤ L ≤ 20 mm. Wherein, the eye distance L is the distance between the human eye 01 and the outermost lens in the optical system.

[0059] The range of the above-mentioned eye distance L can cover all people. For example, different depths of eye sockets result in different distances from the human eye 01 to the optical system, etc. And this will cause differences in the images viewed by different users using the same optical system.

[0060] After step S110 is completed, step S120 can be entered:

[0061] Step S120: Use the value with the largest difference from the theoretical optical performance parameter of the optical system among the multiple actual optical performance parameters as the target optical performance parameter of the optical system.

[0062] In the above step S110, a plurality of actual optical performance parameters adapted to the optical system have been obtained under different pupil diameters D and different eye distances L. These values are very numerous, and if each is used as an evaluation parameter for evaluation, it may cause an excessive calculation amount.

[0063] Therefore, in this step S120, each obtained actual optical performance parameter is compared with the theoretical optical performance parameter of the optical system to obtain the difference amount, and the actual optical performance parameter with the largest difference from the theoretical optical performance parameter of the optical system is found, and this parameter is used as the target optical performance parameter of the optical system to evaluate the imaging difference of the optical system for different users in subsequent steps.

[0064] That is to say, in the solution of the embodiment of the present application, by obtaining the maximum difference situation of the optical performance parameters of the optical system caused by the change of the pupil size D (2 mm ≤ D ≤ 4 mm) and the distance from the human eye to the outermost lens of the optical system (i.e., the eye distance L, L satisfies 10 mm ≤ L ≤ 20 mm) within the limited range, this is used as the condition for judging the imaging difference of the optical system.

[0065] After step S120 is completed, step S130 can be entered:

[0066] Step S130: Determine the user usage error parameter of the optical system according to the target optical performance parameter and the theoretical optical performance parameter of the optical system.

[0067] In this embodiment, the user usage error parameter of the optical system is set as the ratio of the difference between the target optical performance parameter and the theoretical optical performance parameter of the optical system to the theoretical optical performance parameter of the optical system.

[0068] In the solution of the embodiment of the present application, a user usage error parameter of an optical system is proposed, which is defined as the maximum difference in the optical performance parameter of the optical system caused by the change of the pupil size D and the distance L from the human eye to the outermost lens of the optical system within a limited range. Through the user usage error parameter of the optical system, the tolerance of the optical system to different users can be quantitatively evaluated, that is, it can be used to evaluate the imaging difference of different users using the optical system.

[0069] It should be noted that for different users, based on the different pupil diameters D and eye distances L, the corresponding user usage error parameters of the optical system should be different. It can be understood that there is a one-to-one correspondence between the user and the user usage error parameter of the optical system. According to the pupil diameter and eye distance of a user, the actual optical performance parameter of the optical system adapted to the user can be obtained.

[0070] After step S130 is completed, step S140 can be entered:

[0071] Step S140: Judge the imaging difference of the optical system for different users according to the user usage error parameter of the optical system.

[0072] That is to say, in this step S140, according to the user usage error parameter of the optical system obtained in step S130, it is judged whether the optical system has good imaging quality for different users.

[0073] In an example, when the user usage error parameter of the optical system obtained through step S130 is less than the set error parameter, it is determined that the imaging difference of the optical system for different users is small. That is, the optical system has a good user tolerance and has good imaging quality for different users.

[0074] On the contrary, when the user usage error parameter of the optical system obtained through step S130 is greater than the set error parameter, it can be determined that the imaging difference of the optical system for different users is large. That is, the optical system has a poor user tolerance and is not applicable to most users.

[0075] The imaging difference evaluation method of the optical system according to the embodiments of the present application, in which a user usage error parameter of an optical system is proposed, which is defined as the ratio of the maximum difference in optical performance caused by the variation of the pupil size D and the distance from the human eye to the outermost lens of the optical system (eye distance L) within a limited range to the theoretical optical performance parameter, where the limited pupil size D satisfies 2mm ≤ D ≤ 4mm, and the limited distance L from the human eye to the outermost lens of the optical system satisfies 10mm ≤ L ≤ 20mm.

[0076] The imaging difference evaluation method of the optical system according to the embodiments of the present application explores the optical performance differences of the optical system caused by the usage errors of different users, quantifies and explores the tolerance of the optical system to different users, so as to evaluate the comfort and immersion when different users use the optical system.

[0077] The following uses two embodiments to illustrate the imaging difference evaluation method of the optical system according to the embodiments of the present application.

[0078] Embodiment 1

[0079] As Figure 2 The shown optical system includes a diaphragm 30, a first lens 20 and a display screen 10 in sequence along the same optical axis, where the first lens 20 is located between the diaphragm 30 and the display screen 10; a beam splitter element 40 is provided on the surface of the first lens 20 close to the display screen 10 (rear surface 22), and a first phase retarder 50 and a first polarization reflection element 60 are provided on the surface of the first lens 20 away from the display screen 10 (front surface 21), where the first phase retarder 50 is located between the beam splitter element 40 and the first polarization reflection element 60; a second polarization reflection element 70 and a second phase retarder 80 are stacked on the light-emitting surface of the display screen 10.

[0080] Table 1 shows the design data of the optical system:

[0081] Table 1

[0082]

[0083]

[0084] In Table 1, the front surface 21 is the surface of the first lens 20 away from the display screen 10, which is a plane; the rear surface 22 is the surface of the first lens 20 close to the display screen 10, which is an even aspherical surface.

[0085] Among them, the even aspherical surface of the rear surface 22 of the first lens 20 can be calculated by the following formula:

[0086]

[0087] In the above formula: r is the height of the lens center, z is the displacement difference between the aspherical structure and the surface vertex along the optical axis direction at height r, c is the vertex curvature radius of the aspherical surface, k is the conic coefficient, and α i represents the i-th aspherical coefficient. The parameters designed for the rear surface 22 of the first lens 20 are c = 74.320 mm, k = 6.961 mm, α1 = -2.914e -7 , α2 = 1.329e -6 , α3 = 8.294e -9 , α4 = -1.807e -11 , α5 = -2.483e -14 .

[0088] For Figure 1 the optical system shown, the theoretical value of the pupil size D is 2 mm, the distance from the human eye 01 to the surface (front surface 21) of the first lens 10 away from the display screen 10 is 13 mm, and the maximum field of view angle in this embodiment is 90°.

[0089] It is defined that the pupil size 2 mm ≤ D ≤ 4 mm, and the distance L from the human eye 01 to the surface (front surface 21) of the first lens 10 away from the display screen 10 is 10 mm ≤ L ≤ 20 mm.

[0090] For Figure 1 the MTF of the optical system shown has a theoretical value of 0.8512 (i.e., the actual optical performance parameter) at the central field of view of 30 lp / mm. When the pupil size D is 2 mm and the distance from the human eye 01 to the surface (front surface 21) of the first lens 10 away from the display screen 10 is 20 mm, the actual value of the MTF adapted to the optical system at the central field of view of 30 lp / mm is the lowest, and the value is 0.7697. At this time, the user usage error parameter of the optical system is 9.57%. For the FOV theoretical value of 90°, when the pupil size D is 2 mm and the distance L from the human eye 01 to the surface (front surface 21) of the first lens 10 away from the display screen 10 is 20 mm, the actual value of the FOV is the lowest, and the value is 80.8°. At this time, the user usage error parameter of the optical system is 10.22%. This optical system has a good user tolerance and good imaging quality for different users.

[0091] Example 2

[0092] As Figure 4The optical system shown includes, in sequence along the same optical axis, a diaphragm 30, a first lens 20, and a display screen 10. Among them, the first lens 20 is located between the diaphragm 30 and the display screen 10; on the surface of the first lens 20 close to the display screen 10 (rear surface 22), a beam-splitting element 40 is provided, and on the surface of the first lens 20 far from the display screen 10 (front surface 21), a first phase retarder 50 and a first polarization reflection element 60 are provided. Among them, the first phase retarder 50 is located between the beam-splitting element 40 and the first polarization reflection element 60; on the light-emitting surface of the display screen 10, a second polarization reflection element 70 and a second phase retarder 80 are stacked.

[0093] Table 2 shows the design data of the optical system:

[0094] Table 2

[0095] Surface Type Radius of curvature Thickness Clear aperture radius Material Object surface Reference surface Infinity Infinity Infinity Diaphragm 30 Reference surface Infinity 13 mm 2 mm Front surface 21 Reference surface Infinity 9.715 mm 20 mm Nd = 1.54; Vd = 56.28 Rear surface 22 Even aspheric surface -74.32 mm 9.912 mm 20 mm Display screen 10 Reference surface Infinity 0.5 mm 16.326 mm Nd = 1.52; Vd = 64.17

[0096] In Table 2, the front surface 21 is the surface of the first lens 20 far from the display screen 10, and it is a plane; the rear surface 22 is the surface of the first lens 20 close to the display screen 10, and it is an even aspherical surface.

[0097] Among them, the even aspherical surface of the rear surface 22 of the first lens 20 can be calculated by the following formula:

[0098]

[0099] In the above formula: r is the height of the lens center, z is the displacement difference between the aspherical structure and the surface vertex along the optical axis direction at height r, c is the vertex curvature radius of the aspherical surface, k is the conic coefficient, and α i represents the i-th aspherical coefficient. The designed parameters of the rear surface 22 of the first lens 20 are c = 11.633 mm, k = -1.169 mm, α1 = -0.045e -7 , α2 = 5.74e -4 , α3 = -2.147e -6 , α4 = -2.129e -8 , α5 = 1.307e -10 .

[0100] For Figure 4 the optical system shown, the theoretical value of the pupil size D is 2 mm, the distance from the human eye 01 to the surface of the first lens 10 far from the display screen 10 (front surface 21) is 13 mm, and the maximum field of view angle of this embodiment is 60°.

[0101] It is defined that the pupil size 2 mm ≤ D ≤ 4 mm, and the distance L from the human eye 01 to the surface of the first lens 10 far from the display screen 10 (front surface 21) is 10 mm ≤ L ≤ 20 mm.

[0102] For Figure 4 The theoretical value of the MTF of the shown optical system in the central field of view at 30 lp / mm is 0.7278 (i.e., the actual optical performance parameter). When the pupil size D is 4 mm and the distance from the human eye 01 to the surface (front surface 21) of the first lens 10 away from the display screen 10 is 20 mm, the actual value of the MTF adapted to the optical system in the central field of view at 30 lp / mm is the lowest, and the value is 0.1323. At this time, the user usage error parameter of the optical system is 81.82%. For the theoretical value of the FOV being 60°, when the pupil size D is 2 mm and the distance L from the human eye 01 to the surface (front surface 21) of the first lens 10 away from the display screen 10 is 20 mm, the actual value of the FOV is the lowest, and the value is 38.6°. At this time, the user usage error parameter of the optical system is 35.67%. This optical system has a poor user tolerance and cannot be applied to most users.

[0103] <Device Embodiment>

[0104] An imaging difference evaluation device 500 for an optical system is provided in an embodiment of the present application, as Figure 5 shown, including:

[0105] A first determination module 510, configured to determine a plurality of actual optical performance parameters adapted to the optical system according to the association relationship between different pupil diameters D and different eye distances L and the optical system; wherein, the eye distance L is the distance between the human eye and the outermost lens in the optical system;

[0106] A comparison module 520, configured to use the value with the largest difference from the theoretical optical performance parameter of the optical system among the plurality of actual optical performance parameters as the target optical performance parameter of the optical system;

[0107] A second determination module 530, configured to determine the user usage error parameter of the optical system according to the target optical performance parameter of the optical system and the theoretical optical performance parameter of the optical system;

[0108] A judgment module 540, configured to judge the imaging difference of the optical system for different users according to the user usage error parameter of the optical system.

[0109] In the solution of the embodiment of the present application, a user usage error parameter of an optical system is proposed, which is defined as the maximum difference in the optical performance parameters of the optical system caused by the variation of the pupil size D and the distance L from the human eye to the outermost lens of the optical system within a defined range. Through the user usage error parameter of the optical system, the tolerance of the optical system to different users can be quantitatively evaluated, that is, it can be used to evaluate the imaging differences of different users using the optical system, so as to accurately judge the performance of the optical system.

[0110] <Device Embodiment>

[0111] The embodiment of the present application provides an imaging difference evaluation device 600 for an optical system, as Figure 6 shown, including a memory 610, a processor 620, and a computer program stored on the memory 610 and executable on the processor 620. When the processor 620 executes the computer program, the steps of the imaging difference evaluation method for the optical system shown in the above embodiment are implemented.

[0112] In the solution of the embodiment of the present application, a user usage error parameter of an optical system is proposed, which is defined as the maximum difference in the optical performance parameters of the optical system caused by the variation of the pupil size D and the distance L from the human eye to the outermost lens of the optical system within a defined range. Through the user usage error parameter of the optical system, the tolerance of the optical system to different users can be quantitatively evaluated, that is, it can be used to evaluate the imaging differences of different users using the optical system, so as to accurately judge the performance of the optical system.

[0113] <Computer Readable Storage Medium Embodiment>

[0114] This embodiment provides a computer readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the motor driving method as described above are implemented.

[0115] One embodiment or multiple embodiments of this specification may be a system, a method, and / or a computer program product. The computer program product may include a computer readable storage medium having computer readable program instructions thereon for causing a processor to implement various aspects of this specification.

[0116] A computer-readable storage medium can be a tangible device that can hold and store instructions for use by an instruction execution device. A computer-readable storage medium may be, for example—but not limited to—an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disc (DVD), a memory stick, a floppy disk, a mechanically encoded device such as a punched card or raised structures in grooves having instructions stored thereon, and any suitable combination of the foregoing. The computer-readable storage medium as used herein is not construed to be a transitory signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagated through a waveguide or other transmission medium (e.g., an optical pulse through an optical fiber cable), or an electrical signal transmitted through a wire.

[0117] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to respective computing / processing devices, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network may include a copper transmission cable, an optical fiber transmission, a wireless transmission, a router, a firewall, a switch, a gateway computer, and / or an edge server. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in each computing / processing device.

[0118] The computer program instructions for performing the operations of the embodiments of this specification may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine - related instructions, microcode, firmware instructions, state - setting data, or source code or object code written in any combination of one or more programming languages. The programming languages include object - oriented programming languages such as Smalltalk, C++, etc., and conventional procedural programming languages such as the "C" language or similar programming languages. The computer - readable program instructions may be executed entirely on the user's computer, partially on the user's computer, executed as a stand - alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or it may be connected to an external computer (e.g., by using an Internet service provider to connect through the Internet). In some embodiments, by using the state information of the computer - readable program instructions to personalize an electronic circuit, such as a programmable logic circuit, a field - programmable gate array (FPGA), or a programmable logic array (PLA), the electronic circuit can execute the computer - readable program instructions to implement various aspects of this specification.

[0119] Aspects of this specification are described herein with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this specification. It should be understood that each block of the flowcharts and / or block diagrams, and combinations of blocks in the flowcharts and / or block diagrams, can be implemented by computer - readable program instructions.

[0120] These computer - readable program instructions can be provided to a processor of a general - purpose computer, a special - purpose computer, or other programmable data - processing apparatus to produce a machine such that the instructions, when executed by the processor of the computer or other programmable data - processing apparatus, create a means for implementing the functions / acts specified in one or more blocks of the flowchart and / or block diagram. These computer - readable program instructions can also be stored in a computer - readable storage medium, which causes a computer, a programmable data - processing apparatus, and / or other devices to operate in a particular manner. Thus, the computer - readable medium storing the instructions includes a manufacture that includes instructions for implementing various aspects of the functions / acts specified in one or more blocks of the flowchart and / or block diagram.

[0121] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices, causing a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other devices to generate a computer-implemented process, so that the instructions executed on the computer, other programmable data processing apparatus, or other devices implement the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0122] The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present specification. In this regard, each block in the flowchart or block diagram may represent a module, a segment of a program, or a part of an instruction, which contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions noted in the blocks may occur in a different order than noted in the figures. For example, two consecutive blocks may actually be executed substantially in parallel, or they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions. It is well known to those skilled in the art that implementation by hardware, implementation by software, and implementation by a combination of software and hardware are equivalent.

[0123] In the above embodiments, the differences between the various embodiments are mainly described. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0124] Although some specific embodiments of the present application have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration purposes and not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A method for evaluating imaging differences of an optical system, characterized in that, The method includes: Determining a plurality of actual optical performance parameters adapted to the optical system according to the correlation between different pupil diameters D, different eye distances L, and the optical system; wherein, the eye distance L is the distance between the human eye and the outermost lens in the optical system; Taking the value with the largest difference from the theoretical optical performance parameters of the optical system among the plurality of actual optical performance parameters as the target optical performance parameter of the optical system; Determining the user usage error parameter of the optical system according to the target optical performance parameter and the theoretical optical performance parameter of the optical system; Judging the imaging difference of the optical system for different users according to the user usage error parameter of the optical system.

2. The method for evaluating the imaging difference of the optical system according to claim 1, wherein The optical performance parameters of the optical system include at least one of modulation transfer function MTF, field of view FOV, lateral chromatic aberration LCA, and distortion.

3. The method for evaluating the imaging difference of the optical system according to claim 1, characterized in that The pupil diameter D is: 2mm ≤ D ≤ 4mm.

4. The method for evaluating the imaging difference of the optical system according to claim 1, wherein The eye distance L is: 10mm ≤ L ≤ 20mm.

5. The method for evaluating the imaging difference of the optical system according to claim 1, wherein The user usage error parameter of the optical system is: the ratio of the difference between the target optical performance parameter and the theoretical optical performance parameter of the optical system to the theoretical optical performance parameter of the optical system.

6. The method for evaluating the imaging difference of the optical system according to claim 1, characterized in that, The method further includes: when the user usage error parameter of the optical system is less than the set error parameter, determining that the imaging difference of the optical system for different users is small.

7. The method for evaluating the imaging difference of the optical system according to claim 1, characterized in that The optical system is a folded optical path system.

8. An imaging difference evaluation device for an optical system, characterized in that Including: A first determination module, configured to determine a plurality of actual optical performance parameters adapted to the optical system according to the correlation between different pupil diameters D, different eye distances L, and the optical system; wherein, the eye distance L is the distance between the human eye and the outermost lens in the optical system; A comparison module, configured to take the value with the largest difference from the theoretical optical performance parameters of the optical system among the plurality of actual optical performance parameters as the target optical performance parameter of the optical system; A second determination module, configured to determine the user usage error parameter of the optical system according to the target optical performance parameter and the theoretical optical performance parameter of the optical system; A judgment module, configured to judge the imaging difference of the optical system for different users according to the user usage error parameter of the optical system.

9. An imaging difference evaluation device for an optical system, characterized in that Including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps of the method for evaluating the imaging difference of the optical system according to any one of claims 1-7 are implemented.

10. A computer storage medium, characterized in that, A computer program is stored on the computer storage medium. When the computer program is executed by the processor, the steps of the method for evaluating the imaging difference of the optical system according to any one of claims 1-7 are implemented.

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