Light supplementing device, light supplementing method and computer equipment

Abstract

The invention discloses a light supplementing device, a light supplementing method and computer equipment. The device comprises a light source, an optical filter and a super lens, and the light source is used for emitting an initial light beam; the optical filter is used for filtering the initial light beam to obtain a filtered light beam; the super lens is used for performing angle regulation and control on the filtered light beam to obtain a target light beam with a preset angle; wherein the preset angle is determined based on the focal length of the super lens. According to the scheme, the light supplementing angle of the light beam of the light source can be adjusted.

Description

Technical Field

[0001] This application relates to the field of supplementary lighting technology, and particularly to a supplementary lighting device, a supplementary lighting method, and a computer device. Background Art

[0002] With the application of camera devices in more and more fields, there are certain differences in the imaging quality of the images captured by camera devices in different scenarios. For example, in a low-light environment such as at night or in a low-illumination environment, in order to improve the ambient brightness, it is usually necessary to perform supplementary lighting during the image acquisition process to increase the brightness of the shooting environment.

[0003] However, there may be many impurities such as particles and water vapor in the environment. Visible light may scatter in such an impurity environment, and the backward-scattered light enters the lens, forming the background light of the captured image, resulting in a blurry imaging picture and poor imaging quality. Summary of the Invention

[0004] The main technical problem to be solved by this application is to provide a supplementary lighting device, a supplementary lighting method, and a computer device that can adjust the supplementary lighting angle of the light beam of the light source.

[0005] In a first aspect of this application, a supplementary lighting device is provided. The device includes: a light source, a filter, and a metalens. Among them, the light source is used to emit an initial light beam; the filter is used to perform filtering processing on the initial light beam to obtain a filtered light beam; the metalens is used to perform angle regulation on the filtered light beam to obtain a target light beam with a preset angle; where the preset angle is determined based on the focal length of the metalens. The above solution can adjust the supplementary lighting angle of the light beam of the light source.

[0006] In a second aspect of this application, a supplementary lighting method is provided. The method includes: using the supplementary lighting device to obtain a target light beam with a preset angle; where the preset angle is determined based on the focal length of the metalens of the supplementary lighting device; using the target light beam for supplementary lighting during the image acquisition process to obtain a target image.

[0007] In a third aspect of this application, a computer device is provided. The computer device includes a memory and a processor coupled to each other. Program data is stored in the memory, and the processor is used to execute the program data to implement any step of the above supplementary lighting method.

[0008] In the above solution, the fill light device of the present application includes a light source, a filter, and a metalens. Among them, the light source is used to emit an initial light beam, and the filter is used to filter the initial light beam to obtain a filtered light beam, which can filter out the required filtered light beam and reduce the interference of other light beams. Then, the metalens is used to adjust the angle of the filtered light beam to obtain a target light beam with a preset angle, and the preset angle is determined based on the focal length of the metalens, which can adjust the light beam of the light source at a specific angle, so as to adjust the fill light angle of the light beam of the light source, thereby reducing the problem that particle scattering affects the imaging quality during the fill light process. In addition, the structure of the metalens is adopted to realize the angle adjustment of the light beam. By utilizing the characteristics of the metalens such as small volume and light weight, the volume of the components of the fill light device can be effectively reduced.

[0009] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the present application. Brief Description of the Drawings

[0010] In order to more clearly illustrate the technical solutions in the present application, the following will briefly introduce the drawings required in the description of the embodiments. Obviously, the following described drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0011] Figure 1 is a schematic structural diagram of an embodiment of the fill light device of the present application;

[0012] Figure 2 is a schematic structural diagram of an embodiment of the filter of the present application;

[0013] Figure 3 is a schematic structural diagram of an embodiment of the filter unit of the present application;

[0014] Figure 4 is a schematic structural diagram of an embodiment of the first nanocolumn of the present application;

[0015] Figure 5 is a schematic structural diagram of an embodiment of the metalens of the present application;

[0016] Figure 6 is an exemplary schematic diagram of an embodiment of the metalens of the present application;

[0017] Figure 7 is an exemplary schematic diagram of another embodiment of the metalens of the present application;

[0018] Figure 8 is a schematic flowchart of an embodiment of the fill light method of the present application;

[0019] Figure 9 is a schematic structural diagram of an embodiment of the computer device of the present application. Detailed implementation manners

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0021] The terms "first" and "second" in the present application are only for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0022] Referring to "embodiment" in the present application means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appears at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0023] The term "and / or" in this document is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after. In addition, "a plurality" in this document means two or more than two. In addition, the term "at least one" in this document means any one of a plurality or any combination of at least two of a plurality. For example, including at least one of A, B, and C may mean including any one or more elements selected from the set composed of A, B, and C.

[0024] The present application provides the following embodiments, and the following will specifically describe each embodiment. <00The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0021] The terms "first" and "second" in the present application are only for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0022] Referring to "embodiment" in the present application means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appears at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0023] The term "and / or" in this document is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after. In addition, "a plurality" in this document means two or more than two. In addition, the term "at least one" in this document means any one of a plurality or any combination of at least two of a plurality. For example, including at least one of A, B, and C may mean including any one or more elements selected from the set composed of A, B, and C.

[0024] The present application provides the following embodiments, and the following will specifically describe each embodiment.

[0025] Please refer to Figure 1 , Figure 1It is a schematic structural diagram of an embodiment of the supplementary light device of the present application.

[0026] The supplementary light device 10 includes a light source 11, a filter 12, and a metalens 13. Among them, the light source 11 can be used to emit an initial light beam. Optionally, the light source 11 can be an LED (Light Emitting Diode) light source, a laser light source, or the like. Optionally, the light source 11 is a white light source, and the initial light beam emitted by the light source 11 can be a white light beam. For example, the spectral range of the initial light beam can be λ1 to λ2 (that is, it can be a white light beam), and the present application does not limit the light source 11. The filter 12 can be used to perform filtering processing on the initial light beam to obtain a filtered light beam. The filter 12 is an optical filter that can be used to select light beams in the required wavelength band. Some spectral components or interfering light rays in the initial light beam emitted by the light source 11 can be filtered out to obtain a filtered light beam through filtering processing. Then, the filter 12 can transmit the filtered light beam to the metalens 13. The metalens 13 can be used to adjust the angle of the filtered light beam after filtering processing to obtain a target light beam with a preset angle, where the preset angle is determined based on the focal length of the metalens 13.

[0027] In the above solution, the supplementary light device 10 of the present application can include a light source 11, a filter 12, and a metalens 13. Among them, the light source 11 is used to emit an initial light beam, and the filter 12 is used to perform filtering processing on the initial light beam to obtain a filtered light beam. The required filtered light beam can be obtained through filtering, reducing the interference of other light beams. Then, the metalens 13 is used to adjust the angle of the filtered light beam to obtain a target light beam with a preset angle. The preset angle is determined based on the focal length of the metalens 13, and the light beam of the light source 11 can be adjusted at a specific angle, so that the supplementary light angle of the light beam of the light source 11 can be adjusted. Thus, during the supplementary light process, the problem that particle scattering affects the imaging quality can be reduced. In addition, the structure of the metalens 13 is adopted to realize the angle adjustment of the light beam. Utilizing the characteristics of the small volume and light weight of the metalens 13, the volume of the components of the supplementary light device 10 can be effectively reduced.

[0028] In some embodiments, continue to refer to Figure 1 , the supplementary light device 10 further includes a collimating lens 14. The collimating lens 14 can be a convex lens, a yuanbao lens, a lens with a metasurface, etc., and the present application does not limit the collimating lens 14. Among them, the collimating lens 14 can be disposed between the light source 11 and the filter 12 and is used to adjust the initial light beam emitted by the light source 11 into a parallel light beam and then enter the filter 12.

[0029] Optionally, the collimating lens 14 may be a polygonal lens. On the side away from the light source 11, it may have a linear structure, and on the side close to the light source 11, it may have a polygonal structure. In this way, the polygonal structure of the collimating lens 14 can be set in combination with the light-emitting range of the light source 11, etc. The structure of the collimating lens 14 in this application is not limited.

[0030] Optionally, a groove structure is formed on the side of the collimating lens 14 close to the light source 11. The opening of the groove faces the light source 11, and the scale of the groove can cover the light-emitting range of the light source 11. In this way, the collimating lens 14 can adjust most of the initial light beams into parallel light beams and minimize the volume of the collimating lens 14 as much as possible. The collimating lens 14 with this structure can not only adjust the initial light beam of the light source 11 into a parallel light beam and then enter the filter 12, but also minimize the volume of the supplementary light device 10.

[0031] In some embodiments, the filter 12 and the metalens 13 form a preset angle θ1. Optionally, the preset angle θ1 may be an angle in the range greater than or equal to 30 degrees and less than or equal to 45 degrees. For example, the preset angle θ1 may be 30 degrees, 35 degrees, or 45 degrees, etc. In this application, the preset angle θ1 is taken as 45 degrees as an example for illustration, and this application is not limited thereto. Among them, the preset angle θ1 enables the filter 12 and the metalens 13 to form an opening with a set scale, and the direction of the opening faces the light source 11.

[0032] Optionally, the filter 12 may be placed parallel to the light-emitting direction of the light source 11. The collimating lens 14 can adjust the initial light beam into a parallel light beam and then enter the filter 12 in a parallel direction. Since the filter 12 and the metalens 13 form a preset angle θ1 (such as 45 degrees), the parallel light beam enters the filter 12 at a set incident angle (such as an incident angle of 45 degrees).

[0033] Optionally, the set scale (such as height and / or width) of the opening formed by the preset angle θ1 between the filter 12 and the metalens 13 may be greater than or equal to the light-emitting range of the collimating lens 14, or the scale (such as height and / or width) of the filter 12 may be greater than or equal to the light-emitting range of the collimating lens 14. In this way, the parallel light beam emitted by the collimating lens 14 can enter the filter 12.

[0034] In some embodiments, the filter 12 can be a reflective filter 12, and the filter 12 is configured to reflect the first incident light incident on the filter 12 to the metalens 13. Herein, the first incident light refers to the light beam entering the filter 12. For example, the first incident light can be a parallel light beam or an initial light beam. In the case where a collimating lens 14 is provided, this first incident light is a parallel light beam; otherwise, the first incident light is an initial light beam. In some application scenarios, since the filter 12 and the metalens 13 form a preset angle θ1, the filter 12 can be used to perform a filtering process on the first incident light incident on the filter 12, and then enter the metalens 13 after being reflected at a set incident angle.

[0035] Optionally, the filter 12 and the metalens 13 form a preset angle θ1, for example, 45 degrees. Then, the filter 12 can be used to perform a filtering process on the first incident light incident on the filter 12, and enter the metalens 13 in a direction perpendicular to the metalens 13 after reflection.

[0036] In some embodiments, the light source 11 can be a white light source 11, and the bandwidth of the filtered light beam is smaller than the bandwidth of the initial light beam, that is, the filter 12 can filter the initial light beam into a narrow-band light. For example, the initial light beam emitted by the light source 11 can be adjusted into a parallel light beam by the collimating lens 14 first, and then incident on the reflective filter 12. The reflective filter 12 can filter the parallel light beam. In this way, the broadband white light can be filtered into a narrow-band filtered light beam, and then reflected into the metalens 13 for beam shaping. The metalens 13 realizes the emission of the light beam at an angle of θ2, and a target light beam is obtained.

[0037] In some embodiments, continue to refer to Figure 1 , the supplementary light device 10 further includes an extinction layer 15. The extinction layer 15 is provided on the side of the filter 12 away from the light source 11, and the extinction layer 15 is configured to absorb the first incident light that is not reflected by the filter 12. Herein, the extinction layer 15 can be made of an extinction material, or the extinction layer 15 is subjected to a blackening extinction treatment, that is, the extinction layer 15 can absorb the incident light beam.

[0038] Optionally, the filter 12 reflects and filters the incident first incident light, and can reflect the first incident light within a preset wavelength range and does not reflect the first incident light outside the preset wavelength range. Thus, the first incident light reflected by the filter 12 enters the metalens 13, and the first incident light not reflected by the filter 12 enters the extinction layer 15. The extinction layer 15 can absorb the first incident light that is not reflected, that is, it can only reflect the required first incident light, and realizes the filtering of the first incident light.

[0039] In some embodiments, for the filter 12 and the metalens 13, they can both be metasurface structures, which can flexibly control the polarization, amplitude, phase and other characteristics of the light beam.

[0040] In some embodiments, the filter 12 includes a first number of filter units, and the metalens 13 includes a second number of lens units. Optionally, the second number may be the same as the first number. Each filter unit corresponds to a lens unit. Each filter unit is configured to filter light outside a preset wavelength range and direct the light within the preset wavelength range to the corresponding lens unit. The lens unit is configured to adjust the angle of the second incident light incident on the lens unit. Herein, the preset wavelength range may refer to the range of the central wavelength. In this way, the first incident light can be split and reflected by multiple filter units, and then the beam angle can be adjusted by the corresponding lens unit of the metalens 13, so as to obtain light with a preset angle.

[0041] In some embodiments, the first number of filter units are N*N filter units arranged in a preset array, and the second number of lens units are N*N lens units arranged in a preset array. The lens units and the filter units are in one-to-one correspondence, where N is an integer.

[0042] Exemplarily, the size of the filter 12 is W*W (i.e., length * width). The filter 12 can be divided into an N*N square array, and each square can be provided with a filter unit. Optionally, each filter unit can be configured to reflect a primary color light, such as red light, green light, or blue light. Optionally, the bandwidth of each filter unit is a preset bandwidth. For example, the bandwidth is 30 nm. This makes the bandwidth of the filtered light beam smaller than the bandwidth of the initial light beam.

[0043] In some embodiments, the first number of filter units includes at least one of a red filter unit, a green filter unit, and a blue filter unit. The red filter unit is configured to filter light outside the red wavelength range, the green filter unit is configured to filter light outside the green wavelength range, and the blue filter unit is configured to filter light outside the blue wavelength range.

[0044] Exemplarily, taking the reflective filter 12 with a metasurface as an example, the red filter unit is configured to reflect light in the red wavelength range, the green filter unit is configured to reflect light in the green wavelength range, and the blue filter unit is configured to reflect light in the blue wavelength range. Herein, the red wavelength range, the green wavelength range, and the blue wavelength range may respectively represent the wavelength ranges corresponding to red light, green light, and blue light. For example, the red wavelength range may refer to the range where the central wavelength is within 600 - 630 nm, the green wavelength range may refer to the range where the central wavelength is within 520 - 550 nm, and the blue wavelength range may refer to the range where the central wavelength is within 460 - 490 nm.

[0045] In some embodiments, the preset array arrangement may refer to the grouped arrangement of red filter units R, green filter units G, and blue filter units B. For example, the grouped arrangement includes triangular arrangement, quadrangular arrangement, pentagonal arrangement, etc. For example, the triangular arrangement may mean arranging in groups with an array of three filter units, and its preset array arrangement may be RGB. For example, the quadrangular arrangement may mean arranging in groups with an array of 2×2 (i.e., four filter units), and its preset array arrangement may be RGGB, etc. The present application does not limit the preset array arrangement.

[0046] Optionally, the preset array arrangement of the red filter unit, green filter unit, and blue filter unit in the filter unit, the number of filter units corresponding to each primary color light, etc. can be determined according to the target light beam to be supplemented. The present application does not limit this.

[0047] Exemplarily, please refer to Figure 2 , taking the 8×8 array arrangement as an example, each square can represent a filter unit, which can be used to reflect light within a preset wavelength range. Taking the preset array arrangement of the RGGB (red, green, blue) type as an example. R represents a red filter unit, which is used to reflect light within the red wavelength range (such as the central wavelength is within the range of 600 - 630 nm), and its bandwidth is 30 nm. G represents a green filter unit, which is used to reflect light within the green wavelength range (such as the central wavelength is within the range of 520 - 550 nm), and its bandwidth is 30 nm. B represents a blue filter unit, which is used to reflect light within the blue wavelength range (such as the central wavelength is within the range of 460 - 490 nm), and its bandwidth is 30 nm.

[0048] In some embodiments, for the filter 12 of the metasurface, each filter unit is provided with first nanocolumns arranged in a first arrangement, and the first nanocolumns can be arranged periodically. Among them, the first nanocolumns are of a first symmetric structure, and each first nanocolumn is disposed on a first substrate.

[0049] Optionally, the number of first nanocolumns provided in different filter units may be the same or different. For example, according to the filtering conditions of each filter unit (such as reflecting light within the blue wavelength range, reflecting light within the red wavelength range, reflecting light within the green wavelength range, etc.), the number of first nanocolumns in each filter unit can be determined respectively. The present application does not limit this.

[0050] Optionally, the first symmetric structure is a rotationally symmetric structure. For example, a cylinder, a square column, a cross-shaped column, etc. Optionally, the first arrangement may be a polygonal arrangement. For example, a rectangular arrangement, a hexagonal arrangement, etc. The present application places no restrictions on the filter unit. Through this symmetric structure, it is not only insensitive to polarization, but also can resonate at a specific wavelength to form a reflection peak. Optionally, the first nanocolumns of different filter units may be of different or the same first symmetric structure and first arrangement. The present application places no restrictions on this.

[0051] Please refer to Figure 3 , for example, for a 2*2 array of filter units, multiple filter units of the RGGB type are arranged, and multiple first nanocolumns can be periodically arranged on the first substrate of the filter unit. For example, the red filter unit R can arrange multiple first nanocolumns corresponding to red, the green filter unit G can arrange multiple first nanocolumns corresponding to green, and the blue filter unit B can arrange multiple first nanocolumns corresponding to blue. The first nanocolumns of the same filter unit can be of the same shape and the same size, and the first nanocolumns of different filter units can be of different shapes and different sizes but can have the same height.

[0052] Optionally, the materials of the first nanocolumns of different filter units are the same or different. For example, the filter 12 can use first nanocolumns made of the same material.

[0053] Optionally, please refer to Figure 4 , in each filter unit, multiple first nanocolumns can be arranged on the first substrate. The material of the first nanocolumns is silicon nitride Si3N4 or titanium dioxide TiO2, etc. The material of the first substrate can be silicon dioxide SiO2, etc. The first nanocolumn can be cylindrical, with a radius of r, a height of H, and a period of P. The period P represents the periodic interval between adjacent first nanocolumns in the first filter unit, and can represent the scale (such as width and / or length) of the area occupied by a single first nanocolumn in the first filter unit. That is, the period P can also be expressed as the area scale corresponding to the first nanocolumn.

[0054] In some embodiments, among the N*N filter units arranged in a preset array, the number N is greater than or equal to a preset value, or the number N satisfies the relationship of the preset array arrangement. For example, N is greater than or equal to 8, so that the filtered light beams reflected by the filter 12 can be fused into white light after passing through the metalens 13. Or, the value of N*N needs to satisfy the multiple relationship of the grouped arrangement of 2*2.

[0055] Optionally, the number N is related to the scale W of the filter 12 and the period P of the first nanocolumn. For example, the value of N is N less than or equal to W / 2P, so that 2*2 first nanocolumns can be arranged in each square to achieve the reflection function.

[0056] In some embodiments, for the metalens 13, since the filtered light beam after the filter 12 enters the metalens 13, the metalens 13 can be correspondingly divided according to the partition of each filtering unit of the filter 12, that is, it can be divided into N*N lens units, and each lens unit corresponds to each filtering unit one by one. Optionally, at least one of a red lens unit, a green lens unit, and a blue lens unit may be provided. The preset array arrangement of the lens units is the same as the preset array arrangement of the filtering units.

[0057] In some embodiments, the first incident light reflected by the red filtering unit in the filter 12 enters the corresponding red lens unit in the metalens 13, the first incident light reflected by the green filtering unit in the filter 12 enters the corresponding green lens unit in the metalens 13, and the first incident light reflected by the blue filtering unit in the filter 12 enters the corresponding blue lens unit in the metalens 13. Among them, the red lens unit is a lens unit that adjusts the angle of light in the red wavelength range, the green lens unit is a lens unit that adjusts the angle of light in the green wavelength range, and the blue lens unit is a lens unit that adjusts the angle of light in the blue wavelength range. It can be understood that each filtering unit can represent a filter 12, and each lens unit can represent a metalens 13. In this way, the primary color lights of white light can be reflected in sub-regions, and the angles of the primary color lights can be adjusted respectively.

[0058] In some embodiments, each lens unit is provided with second nanocolumns arranged in a second arrangement. Among them, the second nanocolumns are of a second symmetric structure. Optionally, the first symmetric structure is a rotationally symmetric structure, such as a cylindrical column, a square column, a cross-shaped column, etc. Optionally, the second arrangement may be a polygonal arrangement, for example, arranged in a square or a hexagon, etc. Each second nanocolumn is disposed on a second substrate. Optionally, the material of the second substrate may be silicon dioxide SiO2, etc. Optionally, the material of the second nanocolumns is silicon nitride Si3N4 or titanium dioxide TiO2, etc. For example, part of the material of the metalens 13 may be silicon dioxide as the second substrate and titanium dioxide as the second nanocolumns, etc. The present application does not limit the lens units. Optionally, the number of second nanocolumns provided in different lens units may be the same or different. For example, the number of second nanocolumns in each lens unit may be determined respectively according to the angle adjustment of the incident light by each lens unit, and the present application does not limit this.

[0059] Optionally, among the second nanocolumns of the same lens unit, there may be at least two different second symmetric structures and / or second nanocolumns of different scales, and the present application does not limit this.

[0060] Please refer to Figure 5, Exemplarily, taking a 4*4 array of the metalens 13 as an example, multiple lens units can be arranged in an RGGB pattern, and each lens unit corresponds to a filter unit one by one. Among them, multiple second nanocolumns can be arranged in each lens unit. For example, the red lens unit can be arranged with multiple second nanocolumns of different scales. The scales (such as radius r) of its multiple second nanocolumns are different, and their heights can be the same. The red lens unit can be used to adjust the angle of the first incident light reflected by the red filter unit.

[0061] In some embodiments, for each lens unit of the metalens 13, the light entering the lens unit can be angle-adjusted to obtain a target light beam with a preset angle θ2 emitted from each lens unit. Among them, the preset angle is determined based on the focal length of the metalens 13. For each lens unit, the preset angle can be determined according to the focal length of each lens unit.

[0062] Please refer to Figure 6 , the scale (such as diameter) of the lens unit is D, the focal length is f, the preset angle of the emitted light is θ2, and the preset angle θ2 is related to the scale D and the focal length f of the lens unit, and can satisfy the preset relationship: tan(θ2 / 2) = D / 2f. Therefore, by adjusting the focal length of the metalens 13, the preset angle θ2 of the fill light can be adjusted, thereby achieving a better fill light effect and improving the quality of the captured image.

[0063] In some embodiments, the phase distribution of each lens unit of the metalens 13 can be set according to a preset phase distribution relationship, and thus the arrangement distribution of the second nanocolumns can be determined. Optionally, the phase distribution of each lens unit can be determined according to the wavelength (or preset wavelength range) of the light reflected and entered and the focal length, etc.

[0064] Please refer to Figure 7 , the phase distribution of the metalens 13 (such as each lens unit) can be determined by the following phase distribution formula, as follows:

[0065]

[0066] Among them, represents the phase distribution of the lens unit in the metalens 13, and a coordinate system can be established according to the center point of each lens unit. λ represents the wavelength of the light entering the metalens 13 (such as the lens unit), and f represents the focal length of the lens unit.

[0067] In the above solution, the initial light beam emitted by the light source 11 first becomes a parallel light beam through the collimation of the collimating lens 14. Then, the parallel light beam enters the reflective filter 12 of the metasurface at an incident angle of 45 degrees. After passing through the filter 12 for "regional spectral splitting and reflection (i.e., each filter unit only reflects one of the three primary colors of light)", it becomes the three primary colors of light. Finally, the three primary colors of light pass through the metalens 13 for beam angle adjustment. The metalens 13 only adjusts the beam angle of the incident primary color light in the corresponding lens unit, and the beam angles of each primary color light are the same, all being a preset angle, so that the three primary colors of light can finally be synthesized into white light to be used as the target light beam for fill light. It can be understood that for other light beams whose target light beam is not white light, such as fill light of other colors is required, different permutations and distributions can be made for the corresponding units of the filter 12 and the metalens 13, so that fill light of different light beams can be carried out.

[0068] In addition, both the filter 12 and the metalens 13 adopt the metasurface structure. Therefore, by using two metasurfaces, the beam angle control of white light can be realized, white light fill light at a specific angle can be realized, and the volume of the fill light device 10 is small and it is easy to integrate.

[0069] In some embodiments, the above fill light device can be used for fill light during the image acquisition process. For example, the fill light device can be set in the imaging device or a fill light device can be externally provided for the imaging device, so as to control the fill light device to perform fill light during the image acquisition process. In this regard, the present application also provides a fill light method.

[0070] Please refer to Figure 8 , Figure 8 which is a schematic flowchart of an embodiment of the fill light method of the present application.

[0071] S21: Use the fill light device to obtain a target light beam at a preset angle; wherein, the preset angle is determined based on the focal length of the metalens of the fill light device.

[0072] When collecting an image, if the acquisition environment is in a low-light environment, a fill light instruction can be turned on to control the fill light device to perform fill light. Turn on the fill light device and use the fill light device to obtain a target light beam at a preset angle; wherein, the preset angle is determined based on the focal length of the metalens of the fill light device, and the fill light angle of the light source can be adjusted through the above fill light device to obtain a target light beam at a preset angle.

[0073] The specific implementation process of this step can refer to the specific implementation process of the above embodiment, and the present application will not elaborate here.

[0074] S22: Use the target light beam for fill light during the image acquisition process to obtain a target image.

[0075] During the image acquisition process, a target light beam is used to supplement the light of the environment, so that a target image with better quality can be acquired. By using the method of adjusting the light supplement angle of the supplementary light, this method can effectively reduce the problem of unclear images caused by particle backscattering.

[0076] It can be understood that in the above method of the specific implementation manner, the writing order of each step does not mean a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0077] It can be understood that the above light supplement method of the present application can be executed by a computer device or the light supplement device can be provided in the computer device and executed by the computer device. The computer device can be any device with processing capabilities, such as a mobile device, a computer, a server, a camera device, etc. The present application does not limit this. In some possible implementation manners, the light supplement method can be implemented by the processor calling the program data stored in the memory.

[0078] For the above embodiments, the present application provides a computer device. Please refer to Figure 9 , Figure 9 which is a schematic structural diagram of an embodiment of the computer device of the present application. The computer device 30 includes a memory 31 and a processor 32. Among them, the memory 31 and the processor 32 are coupled to each other. The memory 31 stores program data, and the processor 32 is used to execute the program data to implement the steps of any embodiment of the above light supplement method.

[0079] In this embodiment, the processor 32 can also be referred to as a CPU (Central Processing Unit, central processing unit). The processor 32 may be an integrated circuit chip with signal processing capabilities. The processor 32 can also be a general-purpose processor, a digital signal processor (DSP, Digital Signal Processing), an application-specific integrated circuit (ASIC, Application Specific Integrated Circuit), a field-programmable gate array (FPGA, Field Programmable Gate Array), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The general-purpose processor can be a microprocessor or the processor 32 can also be any conventional processor, etc.

[0080] In some embodiments, the functions or modules included in the device provided in the above embodiments of the present application can be used to execute the methods described in the above method embodiments. The specific implementation can refer to the description of the above method embodiments. For the sake of brevity, the present application will not repeat it here.

[0081] The descriptions of the above embodiments tend to emphasize the differences between the embodiments. For the similarities or resemblances among them, reference can be made to each other. For the sake of brevity, they will not be elaborated herein in this application.

[0082] The above are only the embodiments of this application, and do not limit the patent scope of this application accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of this application, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of this application by the same token.

Claims

1. A supplementary lighting device, characterized in that, Comprising: A light source for emitting an initial light beam; A filter for filtering the initial light beam to obtain a filtered light beam; A metalens for angularly modulating the filtered light beam to obtain a target light beam with a preset angle; wherein, the preset angle is determined based on the focal length of the metalens.

2. The device according to claim 1, characterized in that, Further comprising: A collimating lens disposed between the light source and the filter for adjusting the initial light beam into a parallel light beam before entering the filter.

3. The device according to claim 1, wherein The filter and the metalens form a preset included angle, wherein the filter is a reflective filter for reflecting the first incident light incident on the filter to the metalens.

4. The device according to claim 3, wherein An extinction layer is provided on a side of the filter away from the light source for absorbing the first incident light not reflected by the filter.

5. The device according to claim 1, wherein The filter comprises a first number of filter units, and the metalens comprises a second number of lens units. Each filter unit corresponds to one lens unit. Each filter unit is used for filtering light outside a preset wavelength range and incidenting the light within the preset wavelength range to the corresponding lens unit, and the lens unit is used for angularly modulating the second incident light incident on the lens unit.

6. The device according to claim 5, wherein The first number of filter units are N*N filter units arranged in a preset array, and the second number of lens units are N*N lens units arranged in a preset array. The lens units and the filter units are in one-to-one correspondence, and N is an integer; And / or, the first number of filter units includes at least one of a red filter unit, a green filter unit, and a blue filter unit; wherein, the red filter unit is used for filtering light outside the red wavelength range, the green filter unit is used for filtering light outside the green wavelength range, and the blue filter unit is used for filtering light outside the blue wavelength range.

7. The device according to claim 5, wherein Each filter unit is provided with first nanocolumns arranged in a first arrangement, and the first nanocolumns are of a first symmetric structure; each lens unit is provided with second nanocolumns arranged in a second arrangement, and the second nanocolumns are of a second symmetric structure.

8. The device according to claim 7, wherein The first symmetric structure is a rotationally symmetric structure; and / or The first arrangement and the second arrangement are polygonal arrangements; and / or The materials of the first nanocolumns and the second nanocolumns are silicon nitride or titanium dioxide; and / or The materials of the first nanocolumns of different filter units are the same, and / or Among the second nanocolumns of the same lens unit, there are at least two different second symmetric structures and / or second nanocolumns of different scales.

9. The device according to claim 1, wherein The light source is a white light source; and / or, the bandwidth of the filtered light beam is smaller than the bandwidth of the initial light beam.

10. A supplementary lighting method, characterized in that, Comprising: Using a supplementary light device, obtain a target light beam at a preset angle; wherein, the preset angle is determined based on the focal length of the metalens of the supplementary light device; During the image acquisition process, use the target light beam for supplementary lighting to obtain a target image.

11. A computer device, characterized in that, It includes a memory and a processor that are coupled to each other. Program data is stored in the memory, and the processor is configured to execute the program data to implement the steps of the method described in claim 10.

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