Optical decryption system, method for manufacturing grating device, and image processing method
By utilizing the light source, display panel, and pixelated nanograting device in the optical decryption system, plaintext images can be reconstructed on multiple plaintext image planes, solving the problem of low encryption integration in existing technologies and improving the security of the decryption system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SVG TECH GRP CO LTD
- Filing Date
- 2024-12-02
- Publication Date
- 2026-06-02
AI Technical Summary
Existing optical encryption and decryption structures can only reconstruct plaintext images on a single plane in a single direction, resulting in low encryption integration.
An optical decryption system, including a light source, a display panel, and pixelated nanograting devices, is used to reconstruct plaintext images on multiple plaintext image planes by controlling the outgoing direction of light. Multi-dimensional mapping is performed using the grating parameters and coordinates of the pixelated nanograting devices to fabricate pixelated nanograting devices for the reconstruction of multiple plaintext images.
It improves encryption integration and ensures that the correct plaintext image can only be reconstructed at the reconstructed plaintext image plane, thus enhancing the security of the decryption system.
Smart Images
Figure CN122131503A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical encryption technology, and in particular to an optical decryption system, a method for fabricating grating devices, and an image processing method. Background Technology
[0002] With the popularization and widespread application of technologies such as the Internet, mobile communications, and the Internet of Things, a large amount of sensitive information, such as personal privacy data, trade secrets, and national security information, is transmitted through networks. During the transmission of information, we often need to encrypt the data to ensure its security. Among various encryption technologies, optical encryption uses optical transmission media, which can reduce the risk of electromagnetic interference and eavesdropping. Furthermore, optical encryption can achieve parallel processing, encrypting or decrypting large amounts of data simultaneously, thereby improving processing efficiency.
[0003] However, current optical encryption and decryption structures can only reconstruct plaintext images on a single plane in one direction, resulting in low encryption integration. Summary of the Invention
[0004] Therefore, it is necessary to provide an optical decryption system, a method for fabricating grating devices, and an image processing method to address the above problems.
[0005] According to a first aspect of the embodiments of this application, an optical decryption system is provided, comprising:
[0006] A light source provides light;
[0007] The display panel is loaded with a ciphertext image, which is formed by encrypting at least two plaintext images, and the light emitted from the light source is incident on the display panel.
[0008] A pixelated nanograting device is disposed on the side of the display panel away from the light source. Light rays passing through each pixel of the encrypted image on the display panel are incident on the pixelated nanograting device, and then emitted again after being controlled by the pixelated nanograting device, so as to display each plaintext image on each plaintext image plane.
[0009] In one embodiment, the display panel includes a plurality of pixels, and the pixelated nanograting device includes a plurality of nanogratings, with each pixel and each nanograting being aligned and configured one-to-one.
[0010] In one embodiment, the ciphertext image is formed by encrypting the first plaintext image and the second plaintext image;
[0011] After the light from each pixel in the encrypted image on the display panel is incident on the pixelated nanograting device, it is re-emitted after being controlled by the pixelated nanograting device, so as to display the first plaintext image on the first plaintext image plane and the second plaintext image on the second plaintext image plane.
[0012] In one embodiment, the plaintext image includes a spherical or wavy shape.
[0013] According to a second aspect of the embodiments of this application, a method for fabricating a grating device is provided for fabricating the pixelated nanograting device in the optical decryption system described above; the method for fabricating the grating device includes:
[0014] Obtain the k-dimensional mapping relationship between plaintext image planes, where k is an integer greater than or equal to 2;
[0015] Based on the k-dimensional mapping relationship between plaintext image planes, the coordinates and grating parameters of each nanograting on the pixelated nanograting device are determined;
[0016] The pixelated nanograting device is fabricated by combining the coordinates and grating parameters of each nanograting.
[0017] In one embodiment, the plaintext image plane includes a first plaintext image plane and a second plaintext image plane; the step of obtaining the k-dimensional mapping relationship between the plaintext image planes includes:
[0018] For each pixel in the first plaintext image plane, determine the mapping relationship between it and k pixels in the second plaintext image plane;
[0019] For each pixel on the second plaintext image plane, determine its mapping relationship with k pixels on the first plaintext image plane.
[0020] In one embodiment, the step of determining the coordinates and grating parameters of each nanograting on the pixelated nanograting device based on the k-dimensional mapping relationship between plaintext image planes includes:
[0021] Determine the lines connecting pixels in the first plaintext image plane and pixels in the second plaintext image plane that have a mapping relationship;
[0022] The coordinates of the intersection points of the extension lines corresponding to each connection on the pixelated nanograting device are determined as the coordinates of each nanograting, and the grating parameters of each nanograting are determined according to the direction of the extension lines.
[0023] Filter and remove data with duplicate coordinates.
[0024] In one embodiment, the grating parameters include the period, orientation, and groove depth of the nanograting.
[0025] According to a third aspect of the embodiments of this application, an image processing method is provided for generating the ciphertext image in the optical decryption system described above; the image processing method includes:
[0026] Obtain the k-dimensional mapping relationship between each plaintext image plane and pixelated nanograting device, where k is an integer greater than or equal to 2;
[0027] Obtain at least two plaintext images to be encrypted;
[0028] Based on the k-dimensional mapping relationship and each of the plaintext images, nanogratings with non-zero pixel intensities on the corresponding plaintext image planes are selected from each of the nanogratings of the pixelated nanograting device.
[0029] Optimize the required diffraction intensity for each selected nanograting;
[0030] The encrypted image is determined based on the diffraction intensity corresponding to each optimized nanograting.
[0031] In one embodiment, the step of obtaining the k-dimensional mapping relationship between each plaintext image plane and the pixelated nanograting device includes:
[0032] Obtain the k-dimensional mapping relationship between plaintext image planes;
[0033] Based on the k-dimensional mapping relationship between plaintext image planes, the coordinates of each nanograting on the pixelated nanograting device are determined to obtain the k-dimensional mapping relationship between each plaintext image plane and the pixelated nanograting device.
[0034] The optical decryption system provided in this application includes a light source, a display panel, and a pixelated nanograting device arranged in sequence. Light from the light source is incident on the display panel loaded with a ciphertext image, which is formed by encrypting at least two plaintext images. When light passing through each pixel of the ciphertext image is incident on the pixelated nanograting device, the outgoing direction of the light can be controlled by the pixelated nanograting device. This allows the grayscale information of the ciphertext image to propagate to each plaintext image plane according to the controlled vector light field propagation path, reconstructing multiple plaintext images. The number and spatial position of the plaintext image planes can be arbitrarily designed, thereby effectively improving the encryption integration. Furthermore, the correct plaintext image can only be reconstructed at the reconstructed plaintext image planes, and the reconstructed plaintext image planes can serve as new encryption keys, improving the security of the decryption system. Attached Figure Description
[0035] Figure 1 This is a schematic diagram of the structure of an optical decryption system provided in an embodiment of this application;
[0036] Figure 2 A schematic diagram of the k-dimensional mapping between each plaintext image plane and the pixelated nanograting device;
[0037] Figure 3 A flowchart illustrating a method for fabricating a grating device according to an embodiment of this application;
[0038] Figure 4 This is a flowchart of step S400 in a method for fabricating a grating device according to an embodiment of this application;
[0039] Figure 5 This is a flowchart of an image processing method provided in an embodiment of this application.
[0040] Explanation of reference numerals in the attached figures:
[0041] 100, Light source; 200, Display panel; 300, Pixelated nanograting device; 310, Nanograting; 400, Plaintext image plane; 410, First plaintext image plane; 420, Second plaintext image plane. Detailed Implementation
[0042] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.
[0043] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0044] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0046] In one embodiment, an optical decryption system is provided.
[0047] Reference Figure 1 The optical decryption system provided in this embodiment includes a light source 100, a display panel 200, and a pixelated nanograting device 300. The light source 100 provides light. The display panel 200 displays an encrypted image, which is formed by encrypting at least two plaintext images. The light emitted from the light source 100 is incident on the display panel 200. The pixelated nanograting device 300 is disposed on the side of the display panel 200 opposite to the light source 100. Light passing through each pixel of the encrypted image on the display panel 200 is incident on the pixelated nanograting device 300, and then re-emitted after being controlled by the pixelated nanograting device 300, so as to display each plaintext image on each plaintext image plane 400.
[0048] The optical decryption system provided in this embodiment includes a light source 100, a display panel 200, and a pixelated nanograting device 300 arranged sequentially. Light from the light source 100 can be incident on the display panel 200, which displays a ciphertext image. The ciphertext image is formed by encrypting at least two plaintext images. When light passing through each pixel of the ciphertext image is incident on the pixelated nanograting device 300, the outgoing direction of the light can be controlled by the pixelated nanograting device 300. This allows the grayscale information of the ciphertext image to propagate along the controlled vector light field propagation path to each plaintext image plane 400, reconstructing multiple plaintext images. The number and spatial position of the plaintext image planes 400 can be arbitrarily designed, thereby effectively improving the encryption integration. Furthermore, the correct plaintext image can only be reconstructed at the reconstructed plaintext image planes 400. The reconstructed plaintext image planes 400 can serve as new encryption keys, improving the security of the decryption system.
[0049] In this embodiment, the light provided by the light source 100 can be parallel white light that is combined into RGB three laser beams and then expanded and collimated. The parallel white light is incident on the display panel 200 as backlight.
[0050] In this embodiment, the display panel 200 may include, but is not limited to, a liquid crystal display panel 200. An encrypted image is loaded onto the display panel 200. The encrypted image can be formed by encrypting at least two plaintext images. The number of plaintext images can be two, three, four, or more, and no specific limitation is made here. The method for forming the encrypted image can be found in the specific description of the image processing method provided in the following embodiments, and will not be repeated here.
[0051] In one embodiment, the display panel 200 includes a plurality of pixels, and the pixelated nanograting device 300 includes a plurality of nanogratings 310, with each pixel and each nanograting 310 aligned and arranged one by one.
[0052] Specifically, the pixelated nanograting device 300 can be composed of countless rectangular nanogratings 310 arranged together. The grating period and orientation of the nanogratings 310 are designed by the grating equation, thereby controlling the emission direction of the incident light. The display panel 200 includes a number of pixels. When designing this optical decryption system, each nanograting 310 in the pixelated nanograting device 300 can be aligned with each pixel in the display panel 200. This ensures that the light passing through each pixel on the display panel 200 can be incident on the corresponding nanograting 310, so that the emission direction of the light can be controlled by the nanograting 310. That is, the size, arrangement, and number of pixels on the display panel 200 are consistent with the size, arrangement, and number of nanogratings 310 in the pixelated nanograting device 300.
[0053] In this embodiment, the pixelated nanograting device 300 can be fabricated using nanoimprint lithography, thereby improving fabrication efficiency and the integration of the optical decryption system. For a detailed description of the fabrication method of the pixelated nanograting device 300 provided in the following embodiments, please refer to the specific description of the grating device fabrication method provided below; it will not be repeated here.
[0054] In one embodiment, the ciphertext image is formed by encrypting the first plaintext image and the second plaintext image. Accordingly, light rays passing through each pixel of the ciphertext image on the display panel 200 are incident on the pixelated nanograting device 300, and then re-emitted after being controlled by the pixelated nanograting device 300, so as to display the first plaintext image on the first plaintext image plane 410 and the second plaintext image on the second plaintext image plane 420.
[0055] In one embodiment, each of the plaintext images may include any unobstructed surface such as a sphere or a wave, thereby increasing the difficulty of cracking the encryption.
[0056] In one embodiment, a method for fabricating a grating device is provided. The method provided in this embodiment can be used to fabricate the pixelated nanograting device 300 in the optical decryption system provided in the above embodiment.
[0057] Reference Figure 2 and Figure 3 The fabrication method of the grating device provided in this embodiment includes the following steps:
[0058] Step S200: Obtain the k-dimensional mapping relationship between the plaintext image planes 400, where k is an integer greater than or equal to 2.
[0059] First, the position of each plaintext image plane 400 can be determined. The number of plaintext image planes 400 can be two, three, four or more, and the plaintext image planes 400 can be parallel to each other.
[0060] Once the positions of each plaintext image plane 400 are determined, the k-dimensional mapping relationship between them can be determined. Specifically, k refers to the mapping dimension between the pixels of each plaintext image plane 400. For example, if there are two plaintext image planes 400, namely the first plaintext image plane 410 and the second plaintext image plane 420, then for each pixel on the first plaintext image plane 410, its mapping relationship with k pixels on the second plaintext image plane 420 can be determined. Similarly, for each pixel on the second plaintext image plane 420, its mapping relationship with k pixels on the first plaintext image plane 410 can be determined. Thus, the k-dimensional mapping relationship between the first plaintext image plane 410 and the second plaintext image plane 420 is obtained.
[0061] In the process of determining the mapping relationship described above, pixels can be randomly selected for mapping. For example, for pixel a on the first plaintext image plane 410, three pixels can be randomly selected from the second plaintext image plane 420, and mapping relationships can be established between these three pixels and pixel a respectively.
[0062] Here, k can be an integer greater than or equal to 2, such as 2, 3, 4, etc. Generally speaking, the higher the mapping dimension, the better the image reconstruction effect of multiple plaintext image planes 400, and the better the encryption performance, but the computational requirements are also higher. Generally, 4 is sufficient.
[0063] Step S400: Determine the coordinates and grating parameters of each nanograting 310 on the pixelated nanograting device 300 according to the k-dimensional mapping relationship between the plaintext image planes 400.
[0064] Once the k-dimensional mapping relationship between the plaintext image planes 400 is determined, the position of the light ray falling on the pixelated nanograting device 300 can be determined based on the light propagation path of the two pixels in each mapping relationship. Similarly, the position of the light ray falling on the pixelated nanograting device 300 on the light propagation path of the two pixels in each mapping relationship can be determined. Thus, the coordinates and grating parameters of each nanograting 310 on the pixelated nanograting device 300 can be determined.
[0065] Reference Figure 4 In one embodiment, step S400 may specifically include:
[0066] Step S410: Determine the connection between the pixels on the first plaintext image plane 410 and the pixels on the second plaintext image plane 420 that have a mapping relationship;
[0067] Step S420: Determine the coordinates of the intersection points of the extension lines corresponding to each connection line on the pixelated nanograting device 300 as the coordinates of each nanograting 310, and determine the grating parameters of each nanograting 310 according to the direction of the extension lines.
[0068] Step S430: Filter and remove data with duplicate coordinates.
[0069] That is, the lines connecting the pixels on the first plaintext image plane 410 and the pixels on the second plaintext image plane 420 in each mapping relationship can be determined first. The intersection of the extensions of each line on the pixelated nanograting device 300 is then taken, and this intersection is determined as the coordinates of the nanograting 310. The grating parameters of the nanograting 310 can then be determined. Since the coordinates of the nanograting 310 corresponding to the pixels in different mapping relationships may be the same, i.e., there may be intersections with the same coordinates, the intersections with the same coordinates can be filtered and duplicate data can be deleted, keeping only one set of data.
[0070] Step S600: Combine the coordinates and grating parameters of each nanograting 310 to prepare the pixelated nanograting device 300.
[0071] Once the coordinates and grating parameters of each nanograting 310 are determined, pixelated nanograting devices 300 can be fabricated using nanoimprinting technology.
[0072] In one embodiment, the grating parameters include the period, orientation, and groove depth of the nanograting 310.
[0073] In one embodiment, an image processing method is provided. The image processing method provided in this embodiment can be used to generate the ciphertext image in the optical decryption system provided in the foregoing embodiments.
[0074] Reference Figure 5 The image processing method provided in this embodiment includes the following steps:
[0075] Step S100: Obtain the k-dimensional mapping relationship between each plaintext image plane 400 and the pixelated nanograting device 300, where k is an integer greater than or equal to 2.
[0076] The k-dimensional mapping relationship between each plaintext image plane 400 and the pixelated nanograting device 300 can be determined during the fabrication of the pixelated nanograting device 300. Specifically, as described in step S200, the k-dimensional mapping relationship between the plaintext image planes 400 is first obtained. Then, as described in step S400, the coordinates of each nanograting 310 on the pixelated nanograting device 300 are determined based on the k-dimensional mapping relationship between the plaintext image planes 400 and the pixelated nanograting device 300, thus determining the k-dimensional mapping relationship between each plaintext image plane 400 and the pixelated nanograting device 300. For details, please refer to the specific descriptions of steps S200 and S400 in the fabrication method of the grating device provided in the foregoing embodiments, which will not be repeated here.
[0077] Step S300: Obtain at least two plaintext images to be encrypted.
[0078] At the same time, plaintext images to be encrypted can be obtained, and the number of plaintext images to be encrypted can be two, three, four or more.
[0079] Steps S300 and S100 can be executed simultaneously.
[0080] Step S500: Based on the k-dimensional mapping relationship and each of the plaintext images, select the corresponding nanogratings 310 whose pixel intensity on each plaintext image plane 400 is not 0 from each of the nanogratings 310 of the pixelated nanograting device 300.
[0081] In the optical decryption system provided in the foregoing embodiments, each pixel in the ciphertext image can be mapped to a pixel on a different plaintext image plane 400, thereby reconstructing the corresponding plaintext image on each plaintext image plane 400. Therefore, it can be deduced that in a k-dimensional mapping relationship, if the pixel intensity of all pixels on each plaintext image plane 400 with a mapping relationship is not zero, then the position of the nanograting 310 in that mapping relationship is the position of one of the pixels in the ciphertext image. Accordingly, nanogratings 310 with non-zero pixel intensity on each plaintext image plane 400 can be selected from the nanogratings 310 of the pixelated nanograting device 300. The distribution of the selected nanogratings 310 is the pixel distribution of the ciphertext image.
[0082] Step S700: Optimize the required diffraction intensity of each selected nanograting 310.
[0083] Once the position of the nanograting 310 corresponding to each pixel of the ciphertext image is determined, the diffraction light intensity required to be carried by each nanograting 310 can be optimized to reduce the gap between the actual reconstructed plaintext image and the plaintext image to be presented.
[0084] Step S900: Determine the encrypted image based on the diffraction intensity corresponding to each optimized nanograting 310.
[0085] After obtaining the position of the nanograting 310 corresponding to each pixel of the ciphertext image and the optimized diffraction intensity corresponding to each nanograting 310, the ciphertext image can be determined according to the distribution map of the diffraction intensity of each nanograting 310.
[0086] The encryption process for each plaintext image described above employs a multi-image encryption algorithm with multi-dimensional spatial mapping of vector light field. The decryption process introduces multiple spatial reconstruction surfaces (i.e., multiple plaintext image planes) as new keys for optical decryption. Furthermore, a pixelated nanograting device is used as a light field modulator to precisely modulate the propagation direction and intensity of light. Combined with the continuously refreshable amplitude information provided by the display panel, real-time dynamic continuous modulation of the vector light field is achieved. The scheme of this application has the advantages of high image reconstruction quality, low implementation cost, compact system, multiple encryption channels, and high difficulty in cracking.
[0087] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.
[0088] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0089] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.
Claims
1. An optical decryption system, characterized in that, include: A light source provides light; The display panel is loaded with a ciphertext image, which is formed by encrypting at least two plaintext images, and the light emitted from the light source is incident on the display panel. A pixelated nanograting device is disposed on the side of the display panel away from the light source. Light rays passing through each pixel of the encrypted image on the display panel are incident on the pixelated nanograting device, and then emitted again after being controlled by the pixelated nanograting device, so as to display each plaintext image on each plaintext image plane.
2. The optical decryption system according to claim 1, characterized in that, The display panel includes a plurality of pixels, and the pixelated nanograting device includes a plurality of nanogratings, with each pixel and each nanograting being aligned and set one by one.
3. The optical decryption system according to claim 1, characterized in that, The ciphertext image is formed by encrypting the first plaintext image and the second plaintext image; After the light from each pixel in the encrypted image on the display panel is incident on the pixelated nanograting device, it is re-emitted after being controlled by the pixelated nanograting device, so as to display the first plaintext image on the first plaintext image plane and the second plaintext image on the second plaintext image plane.
4. The optical decryption system according to claim 1, characterized in that, The plaintext image includes spherical or wavy shapes.
5. A method for fabricating a grating device, characterized in that, The method for fabricating the pixelated nanograting device in the optical decryption system as described in any one of claims 1-4 includes: Obtain the k-dimensional mapping relationship between plaintext image planes, where k is an integer greater than or equal to 2; Based on the k-dimensional mapping relationship between plaintext image planes, the coordinates and grating parameters of each nanograting on the pixelated nanograting device are determined; The pixelated nanograting device is fabricated by combining the coordinates and grating parameters of each nanograting.
6. The method for fabricating a grating device according to claim 5, characterized in that, The plaintext image plane includes a first plaintext image plane and a second plaintext image plane; the step of obtaining the k-dimensional mapping relationship between the plaintext image planes includes: For each pixel in the first plaintext image plane, determine the mapping relationship between it and k pixels in the second plaintext image plane; For each pixel on the second plaintext image plane, determine its mapping relationship with k pixels on the first plaintext image plane.
7. The method for fabricating a grating device according to claim 6, characterized in that, The step of determining the coordinates and grating parameters of each nanograting on the pixelated nanograting device based on the k-dimensional mapping relationship between plaintext image planes includes: Determine the lines connecting pixels in the first plaintext image plane and pixels in the second plaintext image plane that have a mapping relationship; The coordinates of the intersection points of the extension lines corresponding to each connection on the pixelated nanograting device are determined as the coordinates of each nanograting, and the grating parameters of each nanograting are determined according to the direction of the extension lines. Filter and remove data with duplicate coordinates.
8. The method for fabricating a grating device according to claim 5, characterized in that, The grating parameters include the period, orientation, and groove depth of the nanograting.
9. An image processing method, characterized in that, The image processing method is used to generate the ciphertext image in the optical decryption system as described in any one of claims 1-4; the image processing method includes: Obtain the k-dimensional mapping relationship between each plaintext image plane and pixelated nanograting device, where k is an integer greater than or equal to 2; Obtain at least two plaintext images to be encrypted; Based on the k-dimensional mapping relationship and each of the plaintext images, nanogratings with non-zero pixel intensities on the corresponding plaintext image planes are selected from each of the nanogratings of the pixelated nanograting device. Optimize the required diffraction intensity for each selected nanograting; The encrypted image is determined based on the diffraction intensity corresponding to each optimized nanograting.
10. The image processing method according to claim 9, characterized in that, The step of obtaining the k-dimensional mapping relationship between each plaintext image plane and pixelated nanograting device includes: Obtain the k-dimensional mapping relationship between plaintext image planes; Based on the k-dimensional mapping relationship between plaintext image planes, the coordinates of each nanograting on the pixelated nanograting device are determined to obtain the k-dimensional mapping relationship between each plaintext image plane and the pixelated nanograting device.