Device and method for detecting point spread function of camera module

Abstract

This disclosure relates to the field of point spread function (PSF) measurement technology, specifically to a PSF detection device and method for a camera module. The PSF detection device includes a substrate, a light source fixing panel, and a point light source. The light source fixing panel is movably fixed to the substrate; the point light source is movably fixed to the light source fixing panel, and the optical path of the point light source can rotate based on the light source fixing panel. The camera module performs imaging based on the light emitted by the point light source, and the PSF of the camera module is detected based on the imaging result. The technical solution of this disclosure improves the efficiency of PSF measurement for camera modules and can measure the PSF of camera modules at different object distances.

Description

Technical Field

[0001] This disclosure relates to the field of point spread function measurement technology, and more specifically, to a point spread function detection device and a point spread function detection method for a camera module. Background Technology

[0002] The point spread function concept can be used to determine the resolution of an optical system. With the frequent application of camera modules in various smart devices, the application of point spread function detection technology is becoming more and more widespread.

[0003] Existing methods for measuring the point spread function of camera modules have low detection efficiency and cannot measure the point spread function of camera modules at different object distances.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this disclosure is to provide a point spread function (PSF) detection device and a method for detecting the PSF of a camera module, thereby improving the PSF efficiency of the camera module to at least a certain extent and enabling the measurement of the PSF of the camera module under different object distances.

[0006] According to a first aspect of this disclosure, a point spread function detection device for a camera module is provided, comprising: a substrate; a light source fixing panel movably fixed to the substrate; a point light source movably fixed to the light source fixing panel, wherein the light path of the point light source is rotatable based on the light source fixing panel; the camera module performs imaging based on the light emitted by the point light source, and detects the point spread function of the camera module based on the imaging result.

[0007] According to a second aspect of this disclosure, a method for detecting the point spread function of a camera module is provided, applied to a point spread function detection device for a camera module. The point spread function detection device includes a substrate, a light source fixing panel, and a point light source. The light source fixing panel is movably fixed to the substrate; the point light source is movably fixed to the light source fixing panel, and the optical path of the point light source can rotate based on the light source fixing panel. The method includes: when the distance between the light source fixing panel and the camera module is a first distance, adjusting the angle between the point light source and the light source fixing panel to obtain a first image acquired by the camera module; adjusting the distance between the light source fixing panel and the camera module to a second distance, and adjusting the position of the point light source on the light source fixing panel based on geometric relationships to obtain a second image corresponding to the first image; and determining the point spread function of the camera module based on the first image and the second image.

[0008] One embodiment of this disclosure provides a point spread function (PSF) detection device for a camera module, including a substrate, a light source fixing panel, and a point light source. The light source fixing panel is movably fixed to the substrate; the point light source is movably fixed to the light source fixing panel, and the optical path of the point light source can rotate based on the light source fixing panel. The camera module performs imaging based on the light emitted by the point light source, and detects the PSF of the camera module based on the imaging result. Compared with the prior art, this device includes multiple point light sources, which can simultaneously detect the PSF of different fields of view of the camera, thus improving the detection efficiency of the PSF. At the same time, the light source fixing panel is movably set on the substrate, which can detect the PSF of the camera module at different object distances. The point light source is movably set on the light source fixing panel, which can ensure that the field of view is the same at different object distances. The PSF of the camera module at different object distances can be detected more accurately by controlling variables.

[0009] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0010] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0011] Figure 1 A structural diagram of a detection device in the related art is shown;

[0012] Figure 2A structural diagram of another detection device in the related art is shown;

[0013] Figure 3 This schematic diagram illustrates the structure of a point spread function detection device for a camera module according to an exemplary embodiment of the present disclosure;

[0014] Figure 4 This schematic diagram illustrates a structural view of a light source fixing panel according to an exemplary embodiment of the present disclosure;

[0015] Figure 5 This schematic diagram illustrates the positional structure of a point light source in an exemplary embodiment of the present disclosure.

[0016] Figure 6 This schematic diagram illustrates the positional structure of another point light source in an exemplary embodiment of the present disclosure.

[0017] Figure 7 This schematically illustrates a flowchart of a point spread function detection method for a camera module according to an exemplary embodiment of the present disclosure;

[0018] Figure 8 The illustration shows a comparison diagram of adjusting the object distance in an exemplary embodiment of the present disclosure. Detailed Implementation

[0019] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0020] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0021] In related technologies, point spread function (DFS) testing typically involves a collimator 1 and a camera module 2. The camera and receiving system constitute the camera module 2; specifically, the receiving system is the image sensor 22 within the camera module 2, used for imaging based on the lens 21 of the camera. (Refer to...) Figure 1 and Figure 2As shown, parallel light is emitted from a collimator, with its optical axis coaxial with the optical axis of lens 21. The light rays pass through lens 21 and converge on image sensor 22 to form an image point, which is the point spread function image. By rotating the parallel light around the camera at different angles, the light rays enter from different incident angles, resulting in different fields of view in the receiving system, thus obtaining point spread function images of the camera at different fields of view. Since the acquired point spread function image is generated by parallel light, it represents the camera's point spread function image with respect to infinity.

[0022] However, the point spread function (PSF) detection techniques in related technologies can only acquire PSF images at infinite distances, and the PSF image acquired in a single shot is only a PSF image of a single field of view. The measurement method has low detection efficiency and cannot measure the PSF of camera module 2 at different object distances.

[0023] Based on the above-mentioned shortcomings, this disclosure first provides a device for detecting the point spread function of a camera module, referring to... Figure 3 As shown, the point spread function detection device of the camera module 2 may include a substrate 3, a light source fixing panel 4, and a point light source 5. The light source fixing panel 4 is movably fixed to the substrate 3; the point light source 5 is movably fixed to the light source fixing panel 4, and the optical path of the point light source 5 can be rotated based on the light source fixing panel 4. The camera module 2 performs imaging based on the light emitted by the point light source 5, so as to detect the point spread function of the camera module 2 based on the imaging result.

[0024] Compared with the prior art, the point spread function detection device for the camera module 2 provided in this disclosure includes multiple point light sources 5, which can simultaneously detect the point spread function of the camera at different fields of view, thus improving the detection efficiency of the point spread function. At the same time, the light source fixing panel 4 is movably set on the substrate 3, which can detect the point spread function of the camera module 2 at different object distances. The point light sources 5 are movably set on the light source fixing panel 4, which can ensure that the field of view is the same at different object distances. The point spread function of the camera module 2 at different object distances can be detected more accurately by controlling variables.

[0025] The following is a detailed description of each component of the point spread function detection device for the aforementioned camera module 2.

[0026] In one example embodiment of this disclosure, the substrate 3 can be a rectangular substrate 3 or a circular substrate 3. The shape of the substrate 3 can also be customized according to user needs. In this example embodiment, it is not limited to the figure.

[0027] In the present exemplary embodiment, a slide rail 31 may be provided on the substrate 3 so that the light source fixing panel 4 can move on the slide rail 31. Herein, the slide rail 31 may be a structure of a slider and a chute, or a structure of a guide rail and a guide wheel (similar to a train rail), and may also be customized according to user requirements, without specific limitation in the present exemplary embodiment.

[0028] It should be noted that the distance from the light source fixing panel 4 to the imaging module 2 may be any value greater than or equal to 10 cm and less than or equal to 2 m, and may also be customized according to user requirements. The length of the slide rail 31 is greater than the distance between the light source fixing panel 4 and the imaging module 2.

[0029] In another exemplary embodiment, the light source fixing panel 4 may be detachably fixed to the substrate 3. When it is necessary to move the light source fixing panel 4, the light source fixing panel 4 can be detached and installed at the required position. For example, the substrate 3 and the light source fixing panel 4 may be detachably connected by magnetic adsorption. For another example, the substrate 3 and the light source fixing panel 4 may be detachably connected by using a suction cup structure, or may also be detachably connected by means of clamping, bonding, etc. The connection manner between the substrate 3 and the light source fixing panel 4 is not specifically limited in the present exemplary embodiment.

[0030] In the present exemplary embodiment, the material of the substrate 3 may be a metal material, such as iron, aluminum, copper, etc., or may also be a wooden material, or other materials such as plastic, rubber, carbon fiber, etc., without specific limitation in the present exemplary embodiment.

[0031] In an exemplary embodiment of the present disclosure, the light source fixing panel 4 is fixed to the substrate 3. Herein, the light source fixing panel 4 may be fixed to the substrate 3 through a fixing bracket. The fixing bracket is movably fixed on the substrate 3, and the light source fixing panel 4 is fixed to the fixing bracket so that the light source fixing panel 4 is movably fixed relative to the substrate 3. The movably fixing manner has been introduced in detail above, and thus will not be elaborated herein.

[0032] In the present exemplary embodiment, at least one chute 41 may be provided on the light source fixing panel 4. The number of the chutes 41 may be two or more, without specific limitation in the present exemplary embodiment.

[0033] In the present exemplary embodiment, as shown in FIG. 3, the chute 41 may be arranged in a "meter" shape, a "cross" shape, etc., and may also be customized according to user requirements, without specific limitation in the present exemplary embodiment.

[0034] In one disclosed example implementation, reference is made to... Figure 4 As shown, an independent, immovable point light source mounting groove 42 is provided at the center of the aforementioned light source fixing panel 4, and other sliding grooves 41 can be arranged around this mounting groove 42.

[0035] In this example embodiment, the number of point light sources 5 installed in each of the slides 41 can be less than or equal to 20, such as 10, 15, etc., and can also be customized according to user needs. No specific limitation is made in this example embodiment.

[0036] In one example embodiment of this disclosure, the slide 41 may be a T-shaped slide 41, and a T-shaped slider is provided on the point light source 5. The slider is adapted to the slide 41 so that the point light source 5 can move on the light source fixing panel 4.

[0037] In this example implementation, refer to Figure 5 and Figure 6 As shown, the point light source 5 can rotate based on the light source fixing panel 4. For example, the point light source 5 may include a slider and a light emitting part 52. The slider is adapted to the groove 41 on the light source fixing panel 4, and the light emitting part 52 is rotatably connected to the slider so that the light path of the point light source 5 can rotate based on the light source fixing panel 4.

[0038] In this example embodiment, the slider may be provided with a spherical groove, and the light emitting part 52 may be provided with a spherical connecting part. The spherical connecting part is adapted to the spherical groove so that the light emitting part 52 and the slider can be rotatably connected.

[0039] It should be noted that there are various types of rotatable connection methods, which are not specifically limited in this example implementation.

[0040] In another exemplary embodiment of this disclosure, the point light source 5 may include a fixing part 51 and a light emitting part 52, wherein the fixing part 51 is detachably adsorbed onto the light source fixing panel 4. For example, the fixing part 51 and the light source fixing panel 4 are fixed by magnetic adsorption. Alternatively, if it cannot be fixed, a suction cup may be provided to detachably fix the fixing part 51 onto the light source fixing panel 4 using atmospheric pressure.

[0041] In other exemplary embodiments of this disclosure, the detachable connection between the fixing part 51 and the light source fixing panel 4 can also be by means of snap-fitting, bonding, etc., and is not specifically limited in this exemplary embodiment.

[0042] In this example embodiment, the fixing part 51 may be provided with a spherical groove, and the light emitting part 52 may be provided with a spherical connecting part. The spherical connecting part is adapted to the spherical groove so that the light emitting part 52 and the fixing part 51 can be rotatably connected.

[0043] It should be noted that there are various types of rotatable connection methods, which are not specifically limited in this example implementation.

[0044] In this example embodiment, the material of the light source fixing panel 4 can be metal, such as iron, aluminum, copper, etc., or wood, or other materials such as plastic, rubber, carbon fiber, etc., and no specific limitation is made in this example embodiment.

[0045] The light source fixing panel 4 can be a rectangular substrate 3 or a circular substrate 3. The shape of the substrate 3 can also be customized according to user needs, and is not specifically limited in this example embodiment.

[0046] In this example embodiment, the point light source 5 can be an optical fiber light source, the emitted light is divergent light, the rotatable angle of the point light source 5 can be approximately 0-80°, the divergence angle of the emitted divergent light can be greater than 5° and less than 40°, and the emission aperture can be greater than 0.02mm and less than 1mm.

[0047] It should be noted that the specific parameters of the point light source 5 mentioned above are for illustrative purposes only, and can be customized according to different camera modules 2. No specific limitation is made in this example implementation.

[0048] In one exemplary embodiment of this disclosure, the camera module 2 may include a lens 21 and an image sensor 22, with light transmitted through the lens 21 to the image sensor 22 for imaging. The detection device for the camera module 2 may further include a camera module 2 support 6, which is fixed to the substrate 3. The support 6 allows the central axis of the lens 21 of the camera module 2 to coincide with the central axis of the light source fixing panel 4. Simultaneously, when the light source fixing panel 4 moves on the substrate 3, it can move along the direction of the light path of the lens 21 of the camera module 2; that is, the slide rail 31 can be parallel to the direction of the light path of the camera module 2, i.e., the slide rail 31 is parallel to the central axis of the lens 21.

[0049] Compared with the prior art, the point spread function detection device for the camera module 2 provided in this disclosure includes multiple point light sources 5, which can simultaneously detect the point spread function of the camera at different fields of view, thus improving the detection efficiency of the point spread function. At the same time, the light source fixing panel 4 is movably set on the substrate 3, which can detect the point spread function of the camera module 2 at different object distances. The point light sources 5 are movably set on the light source fixing panel 4, which can ensure that the field of view is the same at different object distances. The point spread function of the camera module 2 at different object distances can be detected more accurately by controlling variables.

[0050] This disclosure also provides a method for detecting the point spread function of a camera module 2, applied to a point spread function detection device for a camera module 2. The point spread function detection device for the camera module 2 has been described in detail above, and therefore will not be repeated here. (Refer to...) Figure 7 As shown, the point spread function detection method of camera module 2 may include the following steps:

[0051] Step S710: When the distance between the light source fixing panel 4 and the camera module 2 is the first distance, adjust the angle between the point light source 5 and the light source fixing panel 4 so that the camera module 2 can capture the first image.

[0052] Step S720: Adjust the distance between the light source fixing panel 4 and the camera module 2 to a second distance, and adjust the position of the point light source 5 on the light source fixing panel 4 based on geometric relationships, so that the camera module 2 can capture a second image corresponding to the first image;

[0053] Step S730: Determine the point spread function of the camera module 2 based on the first image and the second image.

[0054] The steps described above are explained in detail below.

[0055] In step S710, when the distance between the light source fixing panel 4 and the camera module 2 is a first distance L1, the angle between the point light source 5 and the light source fixing panel 4 is adjusted so that the camera module 2 can capture the first image.

[0056] When measuring the point spread function of the camera module 2, a first object distance can be set first, that is, the first distance L1 between the light source fixing panel 4 and the camera module 2 can be determined. After determining the first distance L1, the angle between the point light source 5 and the light source fixing panel 4 can be adjusted so that the central light path of the point light source 5 illuminates the center position of the lens 21. Then, the camera module 2 is used to take a picture and obtain the first image.

[0057] In step S720, the distance between the light source fixing panel 4 and the camera module 2 is adjusted to a second distance L2, and the position of the point light source 5 on the light source fixing panel 4 is adjusted based on geometric relationships so that the camera module 2 can acquire a second image corresponding to the first image.

[0058] After obtaining the first image, refer to Figure 8 As shown, the first angle between the central optical path of the point light source 5 and the central axis of the lens 21 of the camera module 2 can be determined first, and a second object distance can be determined, that is, the second distance L2 between the light source fixing panel 4 and the camera module 2 can be determined. Then, the position of the point light source 5 and the position of the light source fixing panel 4 are adjusted so that the second angle between the central optical path of each point light source 5 and the central axis of the lens 21 at the second distance L2 is equal to the first angle. Then, the second image is captured using the camera module 2.

[0059] In step S730, the point spread function of the camera module 2 is determined based on the first image and the second image.

[0060] In this example embodiment, step S720 can be executed multiple times to obtain images at multiple object distances. Then, the three-dimensional point spread function of the camera module 2 can be calculated using the images at multiple object distances. The method of determining the point spread function of the camera module 2 based on the image is relatively mature in related technologies, so it will not be described in detail here.

[0061] In summary, in this exemplary embodiment, when detecting the point spread function, images of the camera module at different object distances can be measured. Furthermore, based on the point spread function detection device of the camera module, the corresponding field of view is the same when detecting the point spread function at different object distances, that is, an image group with the object distance as the single variable can be obtained, thereby measuring the three-dimensional point spread function of the camera module.

[0062] The terms “about” or “approximately” as used in this specification generally mean within 20%, preferably within 10%, and even more preferably within 5% of a given value or range. The quantities given here are approximate, meaning that unless otherwise specified, the meanings of “about,” “approximately,” “roughly,” or “approximately” are implied.

[0063] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as the orientation of the examples shown in the accompanying drawings. It is understood that if the icon's arrangement is flipped so that it is upside down, the component described as "up" will become the component described as "down." Other relative terms such as "high," "low," "top," "bottom," "front," "back," "left," and "right" also have similar meanings. When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0064] In this specification, the terms “a,” “an,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “comprising,” “including,” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markings and are not a limitation on the number of objects.

[0065] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0066] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A point spread function detection device for a camera module, characterized in that, The application relates to a point spread function detection device of a camera module. The application relates to a point spread function detection device of a camera module. The application relates to a point spread function detection device of a camera module. The application relates to a point spread function detection device of a camera module. The application relates to a point spread function detection device of a camera module.

2. The point spread function detection apparatus according to claim 1, characterized by The application relates to a point spread function detection device of a camera module. The application relates to a point spread function detection device of a camera module.

3. The point spread function detection apparatus of claim 1, wherein The application relates to a point spread function detection device of a camera module. The application relates to a point spread function detection device of a camera module. The application relates to a point spread function detection device of a camera module.

4. The point spread function detection apparatus of claim 1, wherein The application relates to a point spread function detection device of a camera module. The application relates to a point spread function detection device of a camera module. The application relates to a point spread function detection device of a camera module.

5. The point spread function detection apparatus of claim 1, wherein The application relates to a point spread function detection device of a camera module. The application relates to a point spread function detection device of a camera module. The application relates to a point spread function detection device of a camera module.

6. The point spread function detection apparatus of claim 5, wherein The application relates to a point spread function detection device of a camera module.

7. The point spread function detection apparatus of claim 6, wherein The application relates to a point spread function detection device of a camera module. The application relates to a point spread function detection device of a camera module. 8.A method for detecting a point spread function of a camera module, the method comprising: The application relates to a point spread function detection device of a camera module. The application relates to a point spread function detection device of a camera module. The application relates to a point spread function detection device of a camera module. The application relates to a point spread function detection device of a camera module.

9. The method of claim 8, wherein, The application relates to a point spread function detection device of a camera module. The application relates to a point spread function detection device of a camera module.

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