Digital image encryption transmission system

Abstract

The application relates to a digital image encryption transmission system, which comprises an image receiving template, a storage queue, an image compression module, an image encryption module, a monitoring module, a beam shaping micro-optical element and a diffraction grating module. The diffraction grating module comprises a movable beam and a fixed beam; the decryption module comprises a complex conjugate diffraction grating template, a COMS camera, an image decryption module and an image reconstruction module. The complex conjugate diffraction grating module also comprises a movable beam and a fixed beam, and the module is designed to generate a phase shift by displacement of the movable beam according to a voltage applied to the diffraction grating module, the transformed phase and the phase generated in the diffraction grating module are in complex conjugate relationship, and the decryption of the disordered image signal is realized. The system realizes the encryption and disorder of the image by photoelectric combination, generates two keys, improves the security of the digital image to a certain extent, and reduces the image processing time by using a compression sensing sampling mode.

Description

Technical Field

[0001] This application relates to the field of image processing, specifically to the field of color digital image encryption technology. Background Technology

[0002] With the continuous development of information technology, various types of information, such as images and videos, can be transmitted conveniently and quickly through the network. Digital images are used in various fields such as military, medical, and commercial applications, and people's daily lives, work, and studies are increasingly inseparable from networks and information systems. Therefore, image information security is of paramount importance.

[0003] Nowadays, people increasingly use social media to share images or upload important photos to the cloud. In today's fast-paced world, people want the transmission process to be as short as possible. With the ever-increasing volume of image transmissions, people often worry about whether their sent information could be misused by malicious actors. This has led to increasingly higher demands on encryption systems. Light, with its short wavelength, large information capacity, faster processing speed compared to traditional digital encryption, and ability to undergo transformations such as interference and diffraction, has become a crucial area of ​​research in image encryption.

[0004] Traditional image encryption methods include image scrambling-based encryption and DNA-based image encryption. However, these traditional encryption techniques are increasingly unable to meet the security and processing speed requirements of modern society. Furthermore, the increased computing power of computers poses challenges to the security of information security technologies based on traditional encryption algorithms.

[0005] Various novel image encryption methods exist, including chaotic systems, color code encryption systems, and dual-random phase encryption systems. While chaotic systems offer higher security, they also require more precise synchronization, placing more stringent demands on system performance. Furthermore, noise accumulation within the system degrades synchronization quality, further complicating the synchronization process. Therefore, although chaotic systems produce good encrypted images for digital images, high-dimensional chaotic systems have long computation times, posing challenges in meeting the transmission speed requirements of encryption systems. Color code encryption systems represent color images as a string of binary numbers. After an Arnold transform, the generated color code is scrambled for encryption, and the key for decoding the image is the scrambled order. Directly representing color images with color codes increases storage capacity but reduces processing speed. Dual-random phase coding optical encryption systems are the most basic optical encryption systems. Based on the principle of spacetime duality, they consist of two random phase plates and two Fourier transform lenses for image encryption. However, since dual-random phase coding is a linear encryption system, it cannot resist known-plaintext attacks. The security performance of double random phase coding is not particularly outstanding.

[0006] However, optical encryption is complex, leading some to propose incorporating compressed sensing theory into optical encryption systems. Multimedia data exhibits high redundancy, and images, a common form of multimedia data presentation, can benefit from effective redundancy removal, which can reduce the complexity of optical encryption. Compressed sensing theory explores how to achieve the same signal reconstruction accuracy at lower sampling rates. Since its inception, compressed sensing technology has been widely applied across various fields. It recovers the original signal using far fewer samples than the Nyquist sampling theorem, allowing for signal recovery with minimal sampling. While compressed sensing can simultaneously compress and encrypt signals, image encryption schemes relying solely on traditional compressed sensing techniques are vulnerable to chosen-plaintext attacks due to the inherent characteristics of the measurement matrix.

[0007] How to provide an encryption system that is both secure and fast is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0008] This invention aims to solve the problems of the prior art mentioned above. A digital image encryption transmission system is proposed. The technical solution of this invention is as follows:

[0009] A digital image encryption transmission system includes a digital image encryption system and an image decryption system. The digital image encryption system includes an image receiving module, a storage queue, an image compression module, an image encryption module, a monitoring module, a beamforming micro-optical element, and a diffraction grating module. The image receiving module is used to read in the image to be processed and assign a frame header mark to each frame. The storage queue is used to classify and store the images according to their image types.

[0010] An image compression module is used to perform a compression operation on the image to be compressed to obtain compressed image data, and to transmit the compressed image data to the image encryption module;

[0011] The image encryption module is used to encrypt compressed image data, read the encrypted image information into the optical modulator, and modulate the light generated by the laser.

[0012] The diffraction grating module comprises a movable beam and a fixed beam. The movable beam undergoes a corresponding displacement based on the applied voltage, and its phase changes accordingly. When signal light illuminates the diffraction grating module, the image is scrambled once.

[0013] The monitoring module is used to view the status of the image receiving module in real time, that is, whether the image receiving module can quickly and accurately determine the type of the current frame image and accurately send it to the corresponding storage queue to ensure the execution of subsequent steps.

[0014] Beam-shaping micro-optical elements are used to couple modulated light into the input port;

[0015] The image decryption system includes: a complex conjugate diffraction grating module, a CMOS camera, an image decryption module, and an image reconstruction module; wherein...

[0016] The complex conjugate diffraction grating module consists of a movable beam and a fixed beam. The module is designed such that the movable beam is displaced and causes a phase transformation based on the voltage applied to the diffraction grating module. The transformed phase is complexly conjugate with the phase generated in the diffraction grating module, thereby enabling the decryption of scrambled image signals.

[0017] CMOS cameras are used to read modulated light information into digital image processing systems;

[0018] The image decryption module is used to perform decryption based on the key;

[0019] The image reconstruction module is used to reconstruct the decrypted image and output the resulting images in order.

[0020] Furthermore, the image receiving module reads the image to be processed into the system and classifies it into three categories according to its type: black and white image, color image, and grayscale image. The image receiving module determines the type of the image to be processed and transmits it to either the first storage queue or the second storage queue for storage. The first storage queue stores black and white image information and grayscale image information, while the second storage queue stores color image information. Image compression module A reads the image transmitted from the first storage queue and performs compression operations on the image to be compressed using compressed sensing theory to obtain the compressed image data. Image compression module B reads the image transmitted from the second storage queue, first converting the color image to a grayscale image before performing the compression operation.

[0021] Furthermore, the image compression module compresses the image frame by frame according to the frame header mark and uses compressed sensing theory to sample the image to reduce the amount of data that needs to be processed; image compression module A is designed to compress the image directly, while image compression module B first converts the color image to a grayscale image before performing the image compression operation.

[0022] Furthermore, the diffraction grating module is a phase-sensitive grating. After the movable beam is deflected, the phase profile of the grating changes, thereby modulating the phase of the incident light.

[0023] Furthermore, the phase information of the complex conjugate diffraction grating changes according to the phase change of the diffraction grating module, and is complex conjugate with the phase of the diffraction grating module, thereby realizing the function of phase decryption of the image after phase modulation encryption.

[0024] Furthermore, the image encryption module determines the image order based on the frame header marker and reads the image to be encrypted from the corresponding image compression module.

[0025] Furthermore, the image reconstruction module reconstructs the current frame to obtain an image, and determines whether the original image is a color image based on the frame header information. If so, the reconstructed grayscale image is converted into a color image. The frame header marker is also used to determine the sequential position of each frame image, sort the reconstructed images, and then output them.

[0026] Furthermore, the image decryption module receives digital image information transmitted from the CMOS camera and performs a second decryption of the image according to the scrambling order of the Arnold transform in the image encryption module; the image reconstruction module reconstructs the image after the second decryption and determines whether the original image of the current image is a color image based on the frame header mark of each frame; if it is determined to be a color image, the reconstructed image needs to be restored to a color image; if it is determined to be a grayscale image or a black and white image, no operation is required; the image reconstruction module also arranges and outputs the obtained images according to the reading order of the image receiving module based on the frame header mark.

[0027] The advantages and beneficial effects of this invention are as follows:

[0028] The main innovations of this invention are: Image compression modules A and B employ compressed sensing theory to further reduce the redundancy of multimedia data under the existing Nyquist sampling theory, thereby improving data processing speed. The low-redundancy processed data, combined with the image encryption module, reduces encryption time, allowing the required information to be written into the optical path in a short time. In the subsequent optical path, a diffraction grating module uses an optical encryption method with a shorter encryption time than electrical encryption to perform a second encryption on the transmitted data, improving data security in a short time and better meeting the requirements for both transmission time and security. The image receiving module assigns frame header markers to the multimedia data, ensuring accurate arrangement of the decrypted image information in the image reconstruction module, avoiding garbled information after decoding due to data disorder during transmission, and improving data transmission accuracy. The diffraction grating module and the complex conjugate diffraction grating module use a moving beam and fixed beam structure, rather than the traditional fixed structure diffraction grating, which increases the system's flexibility. Users can change the voltage parameters on the moving beam of the diffraction grating to achieve different phase encryption of the optical signal according to different needs. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a preferred embodiment of a digital image encryption transmission system provided by the present invention;

[0030] Figure 2This is a schematic diagram of the structure of a digital image decryption system provided in this application. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and thoroughly described below with reference to the accompanying drawings. The described embodiments are merely some embodiments of the present invention.

[0032] The technical solution of the present invention to solve the above-mentioned technical problems is:

[0033] like Figure 1-2 As shown, a digital image encryption transmission system includes: an image receiving module, a storage queue, an image compression module, an image encryption module, a monitoring module, a beamforming micro-optical element, and a diffraction grating module.

[0034] The image receiving module reads the image to be processed into the system. Images can be categorized into three types: black and white, color, and grayscale. The system determines the type of image by the image receiving module and transmits it to either the first or second storage queue for storage. The first storage queue primarily stores black and white and grayscale image information, while the second storage queue stores color image information. Image compression module A reads the image transmitted from the first storage queue and performs compression using compressed sensing theory to obtain the compressed image data. Image compression module B reads the image transmitted from the second storage queue, converts the color image to grayscale before compression. The image encryption module uses the Arnold transform to digitally encrypt the compressed image. The encrypted image information is written into a spatial light modulator to modulate the emitted laser light. The modulated light passes through a phase-sensitive diffraction grating, modulating the phase of the signal light. The modulated signal is then coupled into the input port through a beam-shaping micro-optical element.

[0035] The image decryption system includes: a complex conjugate diffraction grating module, a CMOS camera, an image decryption module, and an image reconstruction module.

[0036] The information light containing the processed image information is transmitted and then output as signal light through the output port. The complex conjugate diffraction grating module receives the voltage information applied to the diffraction grating of the image encryption section, generates a corresponding electrical signal, causes the movable beam to shift, and produces a phase that is complexly conjugate with the phase of the diffraction grating module. The signal light passes through the moved complex conjugate diffraction grating module, modulating the information light with its complex conjugate phase. The modulated light information is read into the digital image decryption system through a CMOS camera. The image decryption module receives the scrambling order of the Arnold transform and decrypts the image. The image reconstruction module reconstructs the compressed image, restores the reconstructed image from the original color image to color according to the frame header mark of each frame, and simultaneously arranges the obtained images in a certain order according to the frame header mark for output.

[0037] Preferably, the image compression module compresses images frame by frame based on frame header markers and uses compressed sensing theory for image sampling to reduce the amount of data that needs to be processed. Image compression module A is designed to directly compress the image, while image compression module B requires converting the color image to a grayscale image before performing the image compression operation.

[0038] Preferably, the monitoring module can view the status of the image receiving module in real time, that is, whether the image receiving module can quickly and accurately determine the type of the current frame image and accurately send it to the corresponding storage queue, so as to ensure the execution of subsequent execution steps.

[0039] Preferably, the diffraction grating module is a phase-sensitive grating. After the movable beam is deflected, the phase profile of the grating changes, thereby modulating the phase of the incident light.

[0040] Preferably, the phase information of the complex conjugate diffraction grating changes according to the phase change of the diffraction grating module, and is complex conjugate with the phase of the diffraction grating module, thereby realizing the function of phase decryption of the image after phase modulation encryption.

[0041] Preferably, when determining the image type of the current frame, the image receiving module is also used to mark the frame header of each frame.

[0042] Preferably, the image encryption module determines the image order based on the frame header marker and reads the image to be encrypted from the corresponding image compression module.

[0043] Preferably, the first storage queue is designed to store black and white images and grayscale images, and the second storage queue is designed to receive color images.

[0044] Preferably, the image reconstruction module reconstructs the image of the current frame, determines whether the original image is a color image based on the frame header information, and if so, converts the reconstructed grayscale image to a color image. The frame header marker is also used to determine the sequential position of each frame image, sorts the reconstructed images, and outputs them.

[0045] The image receiving module categorizes images, with different storage queues storing different image types, thus improving the speed of digital image processing. The image compression module employs compressed sensing theory to compress images, shortening the processing time and reducing the amount of data processed.

[0046] The image compression module compresses each frame of the image that is read in. The compressed images are then encrypted sequentially by the image encryption module according to the marked frame headers, which ensures the order of the images and the integrity of each frame, thereby improving the reliability of the image processing system.

[0047] The core of this application is to provide a digital image encrypted transmission system that, when applied to a digital image processing system, improves image processing speed while ensuring a certain level of security.

[0048] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings:

[0049] like Figure 1 The digital image processing system includes an image receiving template 1, a first storage queue 2, a second storage queue 3, an image compression module A4, an image compression module B5, an image encryption module 6, and a monitoring module 15. The image receiving module 1 reads the image to be processed into the digital image processing system. The image receiving module 1 transmits the image to the corresponding storage queue according to the image type of the current frame, and simultaneously marks the frame header of the read current frame. The first storage queue 2 is mainly used to store black-and-white image information and grayscale image information, while the second storage queue 3 is used to store color image information. The image information stored in the first storage queue 2 is transmitted to the image compression module A4, where the black-and-white and grayscale images are directly sampled using compression sensing theory to complete image compression. The image information stored in the second storage queue 3 is transmitted to the image compression module B5, where the color image is first converted to grayscale, and then the grayscale image is compressed using compression sensing theory to obtain the compressed image data. Image encryption module 6 reads images from corresponding image compression modules A4 / B5 according to the frame header marker of each frame and the reading order of image receiving module 1, and performs image encryption using Arnold transform. The encrypted image information is then written to spatial light modulator 8. Monitoring module 15 records the working status information of image receiving module 1 in real time, allowing for easy viewing and ensuring normal system operation.

[0050] like Figure 1The optical encryption transmission section includes a beam-shaping micro-optical element 10, a laser source 7, a spatial light modulator 8, and a diffraction grating 9. The laser 7 acts as the light source, generating laser light to illuminate the spatial light modulator 8, which carries compressed and encrypted image information. The transmissive spatial light modulator 8 modulates the laser source, generating signal light containing image information. A specific voltage is input to both ends of the diffraction grating module 9, causing displacement of the movable beam. The modulated signal light passes through the displaced diffraction grating 9, which modulates the phase of the signal light, thus completing the optical encryption of the image. The beam-shaping micro-optical element 10 couples the encrypted signal light into the input port.

[0051] like Figure 2 The optical receiving and decryption section includes a complex conjugate diffraction grating module 11 and a CMOS camera 12. Information light is output through the output port, propagates a distance, and then enters the complex conjugate diffraction grating module 11. At this point, the complex conjugate diffraction grating module 11 has... Figure 1 In the digital image encryption transmission system, the voltage applied to the diffraction grating module 9 generates a corresponding electrical signal, causing the movable beam to shift. The resulting phase is then complexly conjugate to the phase of the diffraction grating module. The signal light passes through the complex conjugate diffraction grating module, modulating the information light with its complex conjugate phase to decrypt the optical signal. The decrypted optical information is then read into the digital image decryption section by the CMOS camera 12.

[0052] like Figure 2 The digital image decryption section includes an image decryption module 13 and an image reconstruction module 14. The CMOS camera 12 converts the received light signal information into digital information, and the image decryption module 13 receives the digital image information transmitted by the CMOS camera 12 and, according to... Figure 1 In the digital image encryption transmission system, the scrambling order of the Arnold transform in the image encryption module 6 is used for a second decryption of the image. The image reconstruction module 14 reconstructs the image after the second decryption, determining whether the original image of the current image is a color image based on the frame header marker of each frame. If it is determined to be a color image, the reconstructed image needs to be restored to a color image; if it is determined to be a grayscale or black and white image, no operation is required. Simultaneously, the image reconstruction module 14 reconstructs the obtained image according to the frame header marker... Figure 1 The image receiving module 1 of the digital image encryption transmission system reads the images in the correct order and then outputs them.

[0053] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, a computer can be, for example, a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email device, game console, tablet computer, wearable device, or any combination of these devices.

[0054] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0055] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0056] The above embodiments should be understood as illustrative only and not as limiting the scope of protection of the present invention. After reading the description of the present invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent changes and modifications also fall within the scope defined by the claims of the present invention.

Claims

1. A digital image encrypted transmission system, characterized in that, include: A digital optoelectronic encryption system and an image decryption system are provided. The digital optoelectronic encryption system includes an image receiving module, a storage queue, an image compression module, an image encryption module, a monitoring module, a beam-shaping micro-optical element, and a diffraction grating module. The image receiving module is used to read in the image to be processed and assign a frame header mark. The storage queue is used to classify and store the image according to its image type. The image compression module is used to perform compression operations on the image to be compressed to obtain compressed image data, and to transmit the compressed image data to the image encryption module; The image encryption module is used to encrypt compressed image data, read the encrypted image information into the optical modulator, and modulate the light generated by the laser. The diffraction grating module comprises a movable beam and a fixed beam. The movable beam is displaced according to the applied voltage, and the phase changes accordingly. When the signal light shines on the diffraction grating module, the image is scrambled once. The monitoring module is used to view the status of the image receiving module in real time, that is, whether the image receiving module can quickly and accurately determine the type of the current frame image and accurately send it to the corresponding storage queue, so as to ensure the execution of subsequent steps. Beam-shaping micro-optical elements are used to couple modulated light into the input port; The image decryption system includes: a complex conjugate diffraction grating module, a CMOS camera, an image decryption module, and an image reconstruction module; wherein... The complex conjugate diffraction grating module consists of a movable beam and a fixed beam. The module is designed such that the movable beam is displaced and causes a phase transformation based on the voltage applied to the diffraction grating module. The transformed phase is complexly conjugate with the phase generated in the diffraction grating module, thereby enabling the decryption of scrambled image signals. CMOS cameras are used to read modulated light information into digital image processing systems; The image decryption module is used to perform decryption based on the key; The image reconstruction module is used to reconstruct the decrypted image and output the resulting images in order. The image receiving module reads the image to be processed into the system and classifies it into three categories: black and white image, color image, and grayscale image. The image receiving module determines the type of the image to be processed and transmits it to either a first storage queue or a second storage queue for storage. The first storage queue stores black and white image information and grayscale image information, while the second storage queue stores color image information. Image compression module A reads the image transmitted from the first storage queue and performs compression operations on the image to be compressed using compressed sensing theory to obtain the compressed image data. Image compression module B reads the image transmitted from the second storage queue, first converting the color image to a grayscale image before performing the compression operation.

2. The digital image encryption transmission system according to claim 1, characterized in that, The image compression module compresses images frame by frame according to the frame header marker and uses compressed sensing theory to sample images to reduce the amount of data that needs to be processed. Image compression module A is designed to compress images directly, while image compression module B first converts the color image to a grayscale image before performing image compression.

3. The digital image encryption transmission system according to claim 1, characterized in that, The diffraction grating module is a phase-sensitive grating, consisting of a movable beam and a fixed beam. The movable beam generates a corresponding displacement according to the applied voltage. After the movable beam deflects, the phase profile of the grating changes, thus modulating the phase of the incident light. When the signal light illuminates the diffraction grating module, the image is scrambled once.

4. A digital image encryption transmission system according to claim 3, characterized in that, The complex conjugate diffraction grating consists of a movable beam and a fixed beam. Its phase information changes according to the phase change of the diffraction grating module and is complex conjugate with the phase of the diffraction grating module, thus realizing the function of phase decryption of the image after phase modulation encryption.

5. A digital image encryption transmission system according to claim 1, characterized in that, The image receiving module determines the image type of the current frame by marking the frame header of each frame.

6. A digital image encryption transmission system according to claim 5, characterized in that, The image encryption module determines the image order based on the frame header marker and reads the image to be encrypted from the corresponding image compression module.

7. A digital image encryption transmission system according to claim 1, characterized in that, The image reconstruction module reconstructs the image of the current frame and determines whether the original image is a color image based on the frame header information. If it is, the reconstructed grayscale image is converted into a color image. The frame header marker is also used to determine the sequential position of each frame image and sorts the reconstructed images before outputting them.

8. A digital image encryption transmission system according to claim 1, characterized in that, The image decryption module receives digital image information transmitted from the CMOS camera and performs a second decryption of the image according to the scrambling order of the Arnold transform in the image encryption module. The image reconstruction module reconstructs the image after the second decryption and determines whether the original image of the current image is a color image based on the frame header mark of each frame. If it is determined to be a color image, the reconstructed image needs to be restored to a color image. If it is determined to be a grayscale image or a black and white image, no operation is required. The image reconstruction module also arranges and outputs the obtained images according to the order of reading by the image receiving module based on the frame header mark.

Images