Visible light imaging method and device

Abstract

The invention discloses a visible light imaging method and device, and belongs to the field of optical imaging, the method is used for a visible light imaging lens, the visible light imaging lens comprises a first lens and a second lens at a near image end, and the method comprises the following steps: obtaining an initial imaging picture output by the second lens; performing region division on the initial imaging picture to obtain a plurality of initial sub-images; for different initial sub-images and different imaging wavelengths of each initial sub-image, restoration is carried out according to different point spread functions to obtain restored sub-images; splicing all the restored sub-images to obtain a restored imaging picture; wherein the imaging view field is divided into a plurality of sub-view fields which are in one-to-one correspondence with the sub-images, and different point spread functions are respectively determined according to different imaging wavelengths under different sub-view fields. The method does not need to add additional optical components and optical materials for correcting aberration, can reduce the number, volume and weight of lenses of the optical system, further reduces the cost of the optical system, and improves the portability of the lens component.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging, and in particular to a visible light imaging method and device. Background Art

[0002] In conventional lens design, in order to achieve good imaging quality, complex optical structures (such as multi-piece cemented lenses) and expensive optical materials are required. These combinations can fully correct aberrations in each band and enable the lens to have a good optical transfer function in each field of view.

[0003] However, the complex optical structure makes the actual assembled lens not only large in size and heavy, but also brings high hardware costs. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a visible light imaging method and device.

[0005] The present invention provides a visible light imaging method for a visible light imaging lens, the method comprising: obtaining an initial imaging image output by a second lens; dividing the initial imaging image into regions to obtain a plurality of initial sub-images; restoring different initial sub-images and different imaging wavelengths of each initial sub-image according to different point spread functions to obtain complex atomic images; splicing all the complex atomic images to obtain a restored imaging image; wherein the imaging field of view is divided into a plurality of sub-fields of view, corresponding one to one to each sub-image, and the different point spread functions are respectively determined according to different imaging wavelengths under different sub-fields of view.

[0006] In the visible light imaging method of the present invention, before obtaining the initial imaging image output by the second lens, it also includes: determining an error function according to the sagittal ray vertical axis aberration, the meridional ray vertical axis aberration and the wavelength weight of each imaging wavelength; determining the lens parameters by gradually adjusting the lens parameters and each wavelength weight until the error function converges; wherein the lens parameters include the distance between the first lens and the second lens, the curvature radius of the first lens, the curvature radius of the second lens and the image distance, and the sagittal ray vertical axis aberration and the meridional ray vertical axis aberration are determined according to the lens parameters.

[0007] In the visible light imaging method of the present invention, the error function includes:

[0008]

[0009] Where λ represents the imaging wavelength value, W λ represents the wavelength weight, Δx and Δy represent the sagittal ray vertical axis aberration and the meridional ray vertical axis aberration respectively.

[0010] In the visible light imaging method of the present invention, for different initial sub-images and different imaging wavelengths of each initial sub-image, restoration is performed according to different point spread functions to obtain complex atomic images, including: based on a cross-prior algorithm, determining the objective function according to the complex atomic image, the initial sub-image and different point spread functions; optimizing the objective function to determine the complex atomic image.

[0011] In the visible light imaging method of the present invention, before obtaining the initial imaging image output by the second lens, it also includes: dividing the field of view of the visible light imaging lens into N×N sub-fields of view, N is a positive integer greater than 1; for each sub-field of view and each imaging wavelength, determining the point spread function of each imaging wavelength in each sub-field of view based on ray tracing, to obtain the different point spread functions.

[0012] In the visible light imaging method of the present invention, the wavelength weight at the center of the wavelength value range is greater than the wavelength weight at the edge.

[0013] In the visible light imaging method of the present invention, the weight values ​​of different wavelengths also include the following constraints:

[0014] W λ =a(λ-b) 2 +c

[0015] Wherein, λ represents the value of the imaging wavelength, a is less than 0, c is greater than 0, and b is between the minimum imaging wavelength and the maximum imaging wavelength.

[0016] The present invention also provides a visible light imaging lens, comprising: an optical component and a structural component for fixing the optical component; the optical component comprises a first lens and a second lens at a near image end; wherein the lens parameters are determined when an error function converges, the error function is determined according to a sagittal ray vertical axis aberration, a meridional ray vertical axis aberration and a wavelength weight of each imaging wavelength, the sagittal ray vertical axis aberration and the meridional ray vertical axis aberration are determined according to the lens parameters, and the lens parameters include a distance between the first lens and the second lens, a curvature radius of the first lens, a curvature radius of the second lens and an image distance.

[0017] In the visible light imaging lens of the present invention, the structural components include a lens spacer and a pressure ring for fixing the lens, and a lens barrel for carrying the optical components.

[0018] The present invention also provides a visible light imaging device, comprising any one of the above-mentioned visible light imaging lenses and a restoration component, wherein the restoration component comprises: an acquisition module, used to obtain an initial imaging image output by a second lens; a splitting module, used to divide the initial imaging image into regions to obtain a plurality of initial sub-images; a restoration module, used to restore different initial sub-images and different imaging wavelengths of each initial sub-image according to different point spread functions to obtain complex atomic images; and a splicing module, used to splice all the complex atomic images to obtain a restored imaging image; wherein the imaging field of view is divided into a plurality of sub-fields of view, corresponding one-to-one to each sub-image, and the different point spread functions are determined respectively according to different imaging wavelengths under different sub-fields of view.

[0019] The visible light imaging method and device of the present invention selectively perform aberration correction and optimization on specific bands for different sub-fields of view, which can correct the phase difference to the greatest extent and obtain a restored image consistent with a clear image. In addition, there is no need to add additional optical components and optical materials for correcting the phase difference except for two lenses, thereby reducing the number of lenses in the optical system and the volume and weight, thereby reducing the cost of the optical system and improving the portability of the lens assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 is a schematic flow chart of a visible light imaging method according to an embodiment of the present invention;

[0022] Figure 2 is a two-dimensional diagram of the optical system of the visible light imaging lens of an embodiment of the present invention;

[0023] Figure 3 It is a two-dimensional diagram of the optical system of a standard imaging lens;

[0024] Figure 4 is an initial imaging diagram of an embodiment of the present invention;

[0025] Figure 5 is a restored image diagram according to an embodiment of the present invention;

[0026] Figure 6 This is a simulated imaging diagram of a standard imaging lens;

[0027] Figure 7a Schematic diagram of the point spread function of the wavelength band 0.486um according to an embodiment of the present invention;

[0028] Figure 7b Schematic diagram of the point spread function of the wavelength band 0.546um according to an embodiment of the present invention;

[0029] Figure 7c Schematic diagram of the point spread function of the wavelength band 0.656um according to an embodiment of the present invention;

[0030] Figure 8 is a curve showing how the optimization weight changes with wavelength according to an embodiment of the present invention;

[0031] Fig. 9 is a schematic structural diagram of a visible light imaging lens according to an embodiment of the present invention;

[0032] Fig.10a is a schematic diagram of a point diagram of a visible light imaging lens according to an embodiment of the present invention;

[0033] Fig.10b It is a standard lens spot diagram;

[0034] Fig.11a is a schematic diagram of a transfer function of a visible light imaging lens according to an embodiment of the present invention;

[0035] Fig.11b is a schematic diagram of the standard lens transfer function;

[0036] Fig.12a is a schematic diagram of aberrations of a visible light imaging lens according to an embodiment of the present invention;

[0037] Figure 12b is a schematic diagram of standard lens aberrations;

[0038] Explanation of reference numerals: 101, first lens; 102, second lens; 103, filter; 104, lens barrel; 105, first lens spacer; 106, second lens spacer; 107, pressure ring;. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] The present invention aims to reduce the size, weight and cost of the lens while ensuring the imaging quality. A joint optimization visible light imaging method based on a multi-band cross-channel prior algorithm for image restoration and a corresponding lens are designed. The aberration correction of specific bands is selectively performed in combination with the efficiency of the image restoration algorithm, and the point spread function of each field of view is sampled and controlled, thereby reducing the number of lenses and the size and weight of the optical system. The actual imaging of the optical-algorithm joint design lens is a blurred image with chromatic aberration. The blurred image with chromatic aberration is restored by the image restoration algorithm to finally achieve clear imaging without chromatic aberration.

[0041] Combine the following Figure 1 to Figure 1 2. The visible light imaging method and device of the present invention are described. Figure 1 is a flow chart of a visible light imaging method according to an embodiment of the present invention. Figure 1 As shown, the present invention provides a visible light imaging method, which is used for a visible light imaging lens, the visible light imaging lens includes a first lens and a second lens at a near image end, and the visible light imaging method includes:

[0042] S1, obtaining an initial imaging image output by the second lens;

[0043] S2, dividing the initial image into regions to obtain a plurality of initial sub-images;

[0044] S3, for different initial sub-images and different imaging wavelengths of each initial sub-image, restore according to different point spread functions to obtain complex atomic images;

[0045] S4, stitching all the complex atomic images to obtain a restored image;

[0046] The imaging field of view is divided into a plurality of sub-fields of view, which correspond one to one with each sub-image, and the different point spread functions are respectively determined according to different imaging wavelengths under different sub-fields of view.

[0047] like Figure 2 As shown, the visible light imaging lens of the present invention is a jointly designed lens. Figure 3 Compared with the standard imaging lens, the aberration of the jointly designed lens is not optimized, and the point spread functions of different fields of view are not consistent. If the same point spread function is used to restore the image, the algorithm performance cannot be guaranteed. Therefore, the present invention divides the imaging field of view into multiple blocks, such as N×N blocks. The point spread function is determined for different imaging wavelengths under each sub-field of view.

[0048] Taking the working band of 0.48μm to 0.65μm as an example, the imaging wavelengths include 0.656μm, 0.546μm, and 0.486μm. For each sub-image, the three imaging wavelengths are restored respectively to obtain an imaging wavelength sub-image.

[0049] The initial image is as follows Figure 4 As described above, each restored sub-block image is spliced ​​to form a full-frame restored image. The restored image is as follows: Figure 5 As shown. Figure 5 and Figure 4 By comparison, the restored image eliminates blur and chromatic aberration.

[0050] Furthermore, the standard lens is simulated for imaging, such as Figure 6 As shown. By restoring the image ( Figure 5 ) and standard lens imaging ( Figure 6 ) shows that the restored image quality is close to the clear imaging quality of the standard lens, eliminating the image blur and compensating for the chromatic aberration of the system.

[0051] The visible light imaging method of the embodiment of the present invention selectively performs aberration correction and optimization on specific bands for different sub-fields of view, which can correct the phase difference to the greatest extent and obtain a restored image consistent with the clear image. In addition, except for the two lenses, there is no need to add additional optical components and optical materials for correcting the phase difference, thereby reducing the number of lenses in the optical system and the volume and weight, thereby reducing the cost of the optical system and improving the portability of the lens assembly.

[0052] In one embodiment, before obtaining the initial imaging image output by the second lens, the method further includes: determining an error function according to the sagittal ray vertical axis aberration, the meridional ray vertical axis aberration and the wavelength weight of each imaging wavelength; and determining the lens parameters by gradually adjusting the lens parameters and each wavelength weight until the error function converges; wherein the lens parameters include the distance between the first lens and the second lens, the curvature radius of the first lens, the curvature radius of the second lens and the image distance, and the sagittal ray vertical axis aberration and the meridional ray vertical axis aberration are determined according to the lens parameters.

[0053] like Figure 2 As shown, the distance between the first lens and the second lens is 2-4 spacing (ignoring the lens thickness), the first lens is 1-2, the second lens is 4-5, the image distance is 5-6, and taking the working band of 480nm to 65nm as an example, the imaging wavelengths include red, green and blue.

[0054] In order to further improve the accuracy of restoration after lens imaging, the embodiment of the present invention is specially designed for lens parameters, and an error function is used for optimization. It is not difficult to understand that the vertical axis aberration of sagittal rays and the vertical axis aberration of meridional rays can be obtained through the above-mentioned lens parameters, and the specific calculation formula is no longer given here. In addition, the embodiment of the present invention also sets wavelength weights according to different imaging wavelengths, and the larger the wavelength weight, the greater the contribution to the error function and the stronger the correction ability. In addition, the embodiment of the present invention selectively corrects different wavelengths, thereby avoiding aberrations caused by different correction results of different wavelengths.

[0055] In one embodiment, the error function includes:

[0056]

[0057] Where λ represents the imaging wavelength value, W λ represents the wavelength weight, Δx and Δy represent the sagittal ray vertical axis aberration and the meridional ray vertical axis aberration respectively. The larger the weight, the greater the contribution to the error function and the stronger the correction ability.

[0058] In one embodiment, for different initial sub-images and different imaging wavelengths of each initial sub-image, restoration is performed according to different point spread functions to obtain complex atomic images, including: based on a cross prior algorithm, determining the objective function according to the complex atomic image, the initial sub-image and the corresponding point spread function; optimizing the objective function to determine the complex atomic image.

[0059] Ray tracing can be performed in the optical design software to simulate the blurred image (i.e. the initial image). The blurred image block is also divided into N×N blocks, corresponding to the point spread function one by one. The calculation method of the g height m and width n of each sub-block image is as follows:

[0060] m=I H / N

[0061] n=I V / N

[0062] Among them, I H is the horizontal resolution of the full-frame image, such as 1080, I V It is the vertical resolution of the full-frame image, such as 1920.

[0063] According to the clear image and blurred image of the current channel, based on the cross prior, the N×N block sub-images can be restored to determine each complex atomic image. Among them, the cross prior algorithm assumes that the gradient of the image in each channel is consistent. The objective function of the restoration calculation includes the complex atomic image, the initial sub-image and the point spread function. It can be understood that the complex atomic image can be determined after optimization (for example, the objective function is minimized).

[0064] In one embodiment, before obtaining the initial imaging image output by the second lens, the method further includes: dividing the field of view of the visible light imaging lens into N×N sub-fields of view, where N is a positive integer greater than 1; for each sub-field of view and each imaging wavelength, determining the point spread function of each imaging wavelength in each sub-field of view based on ray tracing to obtain the different point spread functions.

[0065] The imaging field of view is divided into N×N. The division method is as follows:

[0066] W Hi =i·W H / N

[0067] W Vi =i·W V / N

[0068] Among them, W H is the horizontal full field of view angle, W V is the vertical full field of view angle, W Hi is the horizontal angle corresponding to the i-th field of view, W Vi is the vertical angle corresponding to the ith field of view. By inputting the horizontal angle and vertical angle into the optical design software, the point spread function at different angles can be obtained, such as Figure 3 and 4 Set N=9.

[0069] Different point spread functions such as Figure 7a -c, Figure 7a It is 0.656μm band, Figure 7b The wavelength is 0.546 μm. Figure 7c It is 0.486um band.

[0070] In one embodiment, the wavelength weight at the center of the wavelength range is greater than the wavelength weight at the edge. Since the present invention has the ability to compensate for lens position chromatic aberration, the optimization of the central wavelength monochromatic aberration is given priority in optical design, and achromatization is not required.

[0071] In one embodiment, different wavelength weight values ​​also include the following constraints:

[0072] W λ =a(λ-b) 2 +c

[0073] Among them, a is less than 0, c is greater than 0, and b is between the minimum imaging wavelength and the maximum imaging wavelength.

[0074] From the above formula, we can see that coefficient a controls the maximum value of its weight, coefficient b controls the position of the central wavelength, and coefficient c controls the minimum value of the weight. By gradually adjusting the coefficients, iterative optimization can be completed in the optical design software until the error function converges and the design of the joint lens is completed. Figure 8 As shown, in one example, the value of coefficient b in the optimization may be -1.00E-3, the value of coefficient b may be 571, and the value of coefficient c may be 8.00.

[0075] like Fig. 9 As shown, the present invention also provides a visible light imaging lens, comprising: an optical component and a structural component for fixing the optical component; the optical component comprises a first lens 101 and a second lens 102 at a near image end.

[0076] The lens parameters are determined when the error function converges, the error function is determined according to the sagittal ray vertical axis aberration, the meridional ray vertical axis aberration and the wavelength weight of each imaging wavelength, the sagittal ray vertical axis aberration and the meridional ray vertical axis aberration are determined according to the lens parameters, and the lens parameters include the distance between the first lens 101 and the second lens 102, the curvature radius of the first lens 101, the curvature radius of the second lens 102 and the image distance.

[0077] The lens includes optical components and structural components, the optical components include two lenses, and in one embodiment, also include a filter 103 at the second lens 102. Taking the case of including the filter 103 as an example, light is incident from the first lens 101, refracted by the second lens 102, and then imaged on the detector through the filter 103.

[0078] In one embodiment, the structural assembly includes a first lens spacer 105, a second lens spacer 106 and a pressure ring 107 for fixing the lens, and a lens barrel 104 for carrying the optical assembly.

[0079] The focal length can be 50mm, the F number is 6, and it is suitable for CCD with a resolution of 1920×1080 and a pixel size of 2.75μm. The first lens 101 is a plano-convex lens with a curvature radius of 42.85mm and infinity, and is fixed in the lens barrel 104 by gluing. The second lens 102 is a biconvex lens with a curvature radius of 21.59mm and -185.17mm, and it is fixed in the lens barrel 104 with the filter 103 by pressing the pressing ring 107. The lens barrel 104 and the first lens 101 and the second lens 102 have threaded holes for adjusting the center deviation of the lens on the circumferential surface. The center interval between the first lens 101 and the second lens 102 can be ensured by trimming the thickness of the first lens spacer 105.

[0080] The present invention also provides a visible light imaging device, comprising the above-mentioned visible light imaging lens and a restoration component, wherein the restoration component comprises: an acquisition module, used to obtain an initial imaging image output by the second lens; a splitting module, used to divide the initial imaging image into regions to obtain multiple initial sub-images; a restoration module, used to restore different initial sub-images and different imaging wavelengths of each initial sub-image according to different point spread functions to obtain complex atomic images; and a splicing module, used to splice all the complex atomic images to obtain a restored imaging image; wherein the imaging field of view is divided into multiple sub-fields of view, corresponding one to one to each sub-image, and the different point spread functions are determined respectively according to different imaging wavelengths under different sub-fields of view.

[0081] The actual image formed by the lens is a blurred image with chromatic aberration. The present invention restores the blurred image with chromatic aberration by accurately measuring the point spread function of the lens space variation through a restoration component and an image restoration algorithm, thereby finally achieving clear imaging without chromatic aberration.

[0082] In the present invention, a standard imaging lens with the same working band, focal length and F number is designed as a comparison object, as described above. Figure 3 Compared with the joint design lens, an additional set of cemented lenses is used to correct aberrations. The point diagram, optical transfer function and aberration comparison of the joint design lens are shown in Figure 2. Fig.10a and 10b , Fig.11a and 11b , Fig.12a and 12b As shown in the figure, the spot of the jointly designed lens is significantly larger than that of the standard lens, the transfer function is also lower than that of the standard lens, and there is a large position chromatic aberration.

[0083] Simulate imaging of standard lens, the image is clear and has no color difference, as shown below: Figure 6 As shown. By restoring the image ( Figure 5 ) and standard lens imaging ( Figure 6 ), the quality of the restored image is close to that of the standard lens, which shows that the jointly designed lens of the present invention can better match the image restoration algorithm and can also obtain a clear restored image without chromatic aberration, thereby achieving lightweight and low-cost lens.

[0084] In addition, the present invention also provides a computer-readable storage medium, such as a flash memory, a hard disk, a multimedia card, a card-type memory (for example, an SD or DX memory, etc.), a random access memory (RAM), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a disk, an optical disk, a server, an App application store, etc., on which a computer program is stored, and the program realizes the corresponding function when executed by the processor. The computer-readable storage medium of this embodiment realizes the visible light imaging method of the method embodiment when executed by the processor.

[0085] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0086] The order of execution of each step in the above embodiment does not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.

[0087] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A visible light imaging method, characterized in that: For a visible light imaging lens, the visible light imaging lens comprises a first lens and a second lens at a near image end, the method comprising: Obtaining an initial imaging image output by the second lens; Dividing the initial image into regions to obtain a plurality of initial sub-images; For different initial sub-images and different imaging wavelengths of each initial sub-image, the complex atomic images are restored according to different point spread functions. All complex atomic images are stitched together to obtain a restored image; The imaging field of view is divided into a plurality of sub-fields of view, which correspond one to one with each sub-image, and the different point spread functions are respectively determined according to different imaging wavelengths under different sub-fields of view.

2. The visible light imaging method according to claim 1, characterized in that: Before obtaining the initial imaging image output by the second lens, the method further includes: Determine the error function according to the sagittal ray vertical axis aberration, the meridional ray vertical axis aberration and the wavelength weight of each imaging wavelength; The lens parameters are determined by gradually adjusting the lens parameters and the weight of each wavelength until the error function converges; The vector ray, wherein the lens parameters include the distance between the first lens and the second lens, the curvature radius of the first lens, the curvature radius of the second lens and the image distance, and the vertical axis aberration and the meridional ray vertical axis aberration are determined according to the lens parameters.

3. The visible light imaging method according to claim 2, characterized in that: The error function includes: Where λ represents the imaging wavelength value, W λ represents the wavelength weight, Δx and Δy represent the sagittal ray vertical axis aberration and the meridional ray vertical axis aberration respectively.

4. The visible light imaging method according to claim 1, characterized in that: For different initial sub-images and different imaging wavelengths of each initial sub-image, the complex atomic images are restored according to different point spread functions, including: Based on the cross-prior algorithm, the objective function is determined according to the complex atomic image, the initial sub-image and different point spread functions; The objective function is optimized to determine the complex atomic image.

5. The visible light imaging method according to claim 1, characterized in that: Before obtaining the initial imaging image output by the second lens, the method further includes: Dividing the field of view of the visible light imaging lens into N×N sub-fields of view, where N is a positive integer greater than 1; For each sub-field of view and each imaging wavelength, the point spread function of each imaging wavelength in each sub-field of view is determined based on ray tracing to obtain the different point spread functions.

6. The visible light imaging method according to claim 2, characterized in that: The weight of the wavelength at the center of the wavelength range is greater than the weight of the wavelength at the edge.

7. The visible light imaging method according to claim 6, characterized in that: The values ​​of different wavelength weights also include the following constraints: W λ =a(λ-b) 2 +c Wherein, λ represents the value of the imaging wavelength, a is less than 0, c is greater than 0, and b is between the minimum imaging wavelength and the maximum imaging wavelength.

8. A visible light imaging lens, characterized in that: include: An optical component and a structural component for fixing the optical component; The optical assembly includes a first lens and a second lens near the image end; The lens parameters are determined when the error function converges, the error function is determined according to the sagittal ray vertical axis aberration, the meridional ray vertical axis aberration and the wavelength weight of each imaging wavelength, the sagittal ray vertical axis aberration and the meridional ray vertical axis aberration are determined according to the lens parameters, and the lens parameters include the distance between the first lens and the second lens, the curvature radius of the first lens, the curvature radius of the second lens and the image distance.

9. The visible light imaging lens according to claim 8, characterized in that: The structural assembly comprises a lens spacer and a pressure ring for fixing the lens, and a lens barrel for carrying the optical assembly.

10. A visible light imaging device, characterized in that: The invention comprises the visible light imaging lens and a restoration component according to claim 8 or 9, wherein the restoration component comprises: An acquisition module, used for acquiring an initial imaging image output by the second lens; A splitting module, used for dividing the initial image into regions to obtain a plurality of initial sub-images; A restoration module, used for restoring different initial sub-images and different imaging wavelengths of each initial sub-image according to different point spread functions to obtain complex atomic images; A stitching module is used to stitch all complex atomic images to obtain a restored image; The imaging field of view is divided into a plurality of sub-fields of view, which correspond one to one with each sub-image, and the different point spread functions are respectively determined according to different imaging wavelengths under different sub-fields of view.

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