Article
Multidisciplinary Sciences
Tieyu Zhao, Yingying Chi
Summary: The study introduced the multiple-parameter fractional Fourier transform (MPFRFT) as an image encryption algorithm, but found many of its keys to be invalid, reducing security. By reformulating the MPFRFT and analyzing using different basis functions, it was discovered that the effective keys were extremely limited, highlighting the security risk of key invalidation in extended encryption methods based on MPFRFT.
Article
Mathematics
Tieyu Zhao, Yingying Chi
Summary: The research in this paper focused on the definition of linear summation of fractional-order matrices and its application in image encryption. A reformulation of the definitions and theoretical analysis were proposed. The study found that many weighted terms are invalid and showed that effective weighted terms depend on the period of the matrix. The research also demonstrated that image encryption methods based on weighted fractional-order transform may pose security risks due to key invalidation.
Article
Computer Science, Information Systems
Tieyu Zhao, Lin Yuan, Yingying Chi
Summary: The LWFRT has limitations in image encryption, leading to security risks of key invalidation. A new reformulation of the LWFRT is proposed to establish the relation between fractional-order transforms and analyze the reasons for key invalidation in image encryption. Numerical simulation verifies the perspective of the study.
JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION
(2021)
Article
Optics
Osama S. Faragallah, Hala S. El-sayed, Ashraf Afifi, Walid El-Shafai
Summary: This paper presents an effective and secure opto color image cryptosystem using 2D Fractional Fourier Transform (2D FrFT) and 2D logistic mapping (2D LM), addressing issues encountered in existing encryption methods.
OPTICS AND LASERS IN ENGINEERING
(2021)
Letter
Optics
Hang Chen, Zhengjun Liu, Camel Tanougast, Walter Blondel
Summary: The optical image scheme using fractional Fourier transform and DNA sequence operation has issues with the DNA xor operation and optical implementation, leading to inability to completely decrypt the original image through the inverse encryption process.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Computer Science, Information Systems
Jie Fang, Minghao Jiang, Nannan Yin, Da Wei, Yin Zhang
Summary: This paper presents an image block encryption algorithm using FRFT, hyperchaotic system, improved logistic map, and DNA encoding. The algorithm enhances the complexity and security of the data through multiple processing and operation.
MULTIMEDIA TOOLS AND APPLICATIONS
(2022)
Article
Physics, Applied
Maria Solyanik-Gorgone, Haoyan Kang, Behrouz Movahhed Nouri, Hamed Dalir, Volker J. Sorger
Summary: In recent years, there has been significant interest in heterogeneous machine learning accelerators. Meanwhile, the post-quantum encryption era increases the demand for data security. This work presents an optical hashing and compression scheme inspired by SWIFFT algorithms and demonstrates the potential of analog optical accelerators for machine learning classification on encrypted data. The proposed algorithm can provide a significant increase in processing speed compared to non-compressed input.
APPLIED PHYSICS REVIEWS
(2023)
Article
Engineering, Multidisciplinary
Mohamed Meselhy Eltoukhy, Ayman E. Khedr, Mostafa M. Abdel-Aziz, Khalid M. Hosny
Summary: This paper proposes a new robust watermarking method that combines Slant, Singular Value Decomposition (SVD), and quaternion Fourier-Transform (QFT) for securing color medical images. The method involves splitting the input image into four parts, encrypting them using OTP encryption, applying Slant transform for compaction, applying SVD for quality preservation, and applying QFT for imperceptibility. The proposed method achieves a good tradeoff between invisibility and robustness compared to existing schemes, and attains high visual imperceptibility.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Computer Science, Information Systems
Himani Sharma, D. C. Mishra, R. K. Sharma, Naveen Kumar
Summary: The paper introduces a novel multi-image crypto-stego technique using Rabin cryptosystem and Arnold transform to hide digital data in different forms, preventing attacks and impersonation by intruders effectively. The experimental results show high PSNR values and low MSE values for audio, image, and video signals, indicating the effectiveness of the proposed technique in protecting sensitive information.
MULTIMEDIA TOOLS AND APPLICATIONS
(2021)
Article
Computer Science, Information Systems
Wanqing Wu, Qiao Wang
Summary: This paper proposes a novel image encryption scheme based on chaotic map and fractional Fourier transformation. The scheme divides the image into blocks, selects high correlation blocks for transformation, changes pixel values using a key related to the plain image, and scrambles the entire image using the Baker Map. The scheme has been verified to have high security and can effectively resist different types of attacks.
MULTIMEDIA TOOLS AND APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Deyun Wei, Jun Yang
Summary: The discrete fractional Fourier transform is a useful tool in non-stationary signal processing. This paper proposes a two-dimensional sparse fractional Fourier transform (2D SFRFT) algorithm, which achieves the lowest runtime and sample complexity compared to existing methods. The algorithm is improved to be robust by analyzing errors due to noises, and its effectiveness is demonstrated in various applications.
Article
Computer Science, Information Systems
Limin Tao, Xikun Liang, Zhijing Wu, Lidong Han, Jiangping Zhu
Summary: In this paper, a composed optical image hybrid encryption scheme is proposed, which combines optical image encryption with digital image encryption. The scheme consists of two main parts, including double random phase encoding in a 4f optical system for encrypting the original image and performing parallel diffusion and confusion on the resulting images. The algorithm utilizes fractional Fourier transform, generalized chaos, and nonlinear transform of matrices. The secureness of the cryptosystem is confirmed by cipher statistical analysis, encryption simulations, and performance analysis. The innovation lies in integrating high-dimensional chaotic digital image encryption into the optical image encryption system and proposing a separate encryption paradigm for real and imaginary images, which greatly enhances the security of image encryption and transmission.
JOURNAL OF GRID COMPUTING
(2023)
Article
Physics, Multidisciplinary
Shuqin Zhu, Congxu Zhu
Summary: This paper analyzes the security issues in image encryption systems based on bit plane extraction and multi chaos, and proposes an improved algorithm that strengthens encryption by linking random sequences to ciphertext. The study demonstrates the vulnerability of the original encryption algorithm and the effectiveness of the proposed attack method.
Article
Mathematics, Interdisciplinary Applications
Tieyu Zhao, Yingying Chi
Summary: This study investigates the discrete fractional Fourier transform and its extended definition, the multiweighted-type fractional Fourier transform, and proves its unitarity. By using basic functions for discussion, it is found that the effective weighting term of the M-WFRFT is only four terms, different from the M terms described in the definition. The analysis of program code reveals inaccuracies in previous works based on MATLAB for unitary verification.
FRACTAL AND FRACTIONAL
(2021)
Article
Computer Science, Information Systems
Febina Ikbal, Rajamma Gopikakumari
Summary: This paper introduces a color image encryption/decryption technique using sequency-based mapped real transform (SMRT), which has features including high sensitivity, complex keystream, strong security, high efficiency, and simple structure.
JOURNAL OF KING SAUD UNIVERSITY-COMPUTER AND INFORMATION SCIENCES
(2022)
Article
Optics
Hang Dong, Zhixin Sun, Jingyi Li, Yahui Li, Wei Zhang, Guangyong Jin
Summary: This paper calculates thermal stresses and adsorption forces to determine laser cleaning conditions and establishes relevant models. Experimental results show that the removal effect is better with increasing nanosecond pulse delay, with the best effect achieved at 600 milliseconds pulse delay. Based on the findings, the mechanisms of oxide film removal involve thermal stress against adsorption and plasma shock wave breaking the oxide layer.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Junjie Zhang, Wenjun Li, Bingtao Li, Zheng-Da Hu, Jicheng Wang, Feng Zhang, Lei Wang
Summary: A multilayer thin film device structure based on Tamm plasmons is proposed for high-performance near-infrared hot electron photodetectors. By optimizing the device structure parameters, high responsivity detection can be achieved.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hong Huang, Zhiguang Han
Summary: This paper proposes a new ghost imaging reconstruction method using ordered orthogonal Hadamard derived speckle as the illumination speckle series, and introduces the alternating direction multiplier method to improve the imaging performance. The evaluation results show that the method can achieve high-quality reconstructed images under low sampling conditions.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Moritsugu Sakamoto, Yuki Ono, Kohei Noda, Tomoyuki Sasaki, Nobuhiro Kawatsuki, Masayuki Tanaka, Hiroshi Ono
Summary: The effect of wavelength and polarization of illuminating light in polarization imaging for birefringent objects placed behind a scattering structure was experimentally investigated. The result shows that the spatial distribution of the birefringent object was more clearly visualized in the longer wavelength combined with circularly polarized light illumination. This finding indicates the potential of using polarization imaging with circularly polarized light illumination in the near-infrared range for visualizing birefringent objects with scattering.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Peihui Du, Hongfang Wang, Pengwei Li, Rukeyemuhan Abadula, Hmbat Batelbek, Min Gao
Summary: In this study, we theoretically demonstrate the strong coupling between Tamm plasmons and exciton polaritons in metal Al/DBR-molecular structures, extending the operating wavelength to the deep ultraviolet region. The coupling strength can be effectively manipulated by adjusting the structure parameters, offering potential benefits for the development of new-style optical filters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Priyanka Chaudhary, Akhilesh Kumar Mishra
Summary: We design and numerically investigate the switching dynamics between two outer waveguides in a parity-time (PT)-symmetric adiabatically coupled three waveguides nonlinear directional coupler (NLDC) system. The study shows that the device can provide switching even when the middle waveguide is nonlinear and the outer waveguides are linear. Furthermore, the effect of loss to gain ratio on critical switching power and the impact of launched light power and gain (loss) value on transmitted power are also studied.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Wei Feng, Yongcong Yi, Shuyang Li, Zhi Xiong, Boya Xie, Zhen Zeng
Summary: Traditional imaging techniques are ineffective in achieving clear underwater imaging due to the presence of scattering media. Single-pixel imaging (SPI) system based on Unet++ offers a solution for reconstructing high-quality images in highly turbid water environments.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiaorui Qu, Jufeng Zhao, Haijun Tian, Junjie Zhu, Guangmang Cui
Summary: This paper studies the structural similarity between RGB and spectral images and proposes a non-iterative Images Structure Similarity (ISS) method for fast reconstruction of spectral images. Additionally, the input of the Deep Image Prior (DIP) method is optimized for the first time by using the initial spectral data reconstructed by ISS, leading to an improved starting value for the iteration. The experimental results show that the proposed method can enhance the reconstruction quality in both spectral and spatial resolutions, while significantly reducing the reconstruction time compared to other DIP-based methods.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Donghe Sheng, Zhe Han, Zanyang Qiao, Tianpei Dong, Chenxi Wang, Huiping Tian
Summary: In this study, a distributed multi-parameter sensor based on an etched few-mode multi-core fiber is proposed, allowing simultaneous sensing of temperature, strain, and sample refractive index. By combining space division multiplexing and stimulated Brillouin scattering, the sensor achieves high sensitivity in detecting these parameters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Dehao Chen, Zhenwu Mo, Zehong Liang, Junjie Jiang, Huilin Tang, Yidan Sun, Ziyu Wang, Quanfeng Wei, Yanru Chen, Dongmei Deng
Summary: In this study, a novel family of elliptical Airyprime vortex beams (EAPVBs) is introduced, which inherits the excellent self-focusing properties of the circular Airyprime vortex beam (CAPVB). The asymmetric focusing of EAPVB leads to some novel properties, such as the splitting of high-order optical vortex and the formation of two foci. By taking advantage of these properties, EAPVB is constructed as a tunable optical bottle for particle capture.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiao Ma, Qiongchan Shao, Jian-Jun He
Summary: In this study, an SHS chip based on Su8 waveguide was designed and fabricated. By physically adjusting the metal electrodes and compensating for transmissivity fluctuations, the generation of side ripples was successfully suppressed.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hongbin Zhang, Jiansen Du, Zongtao Chi, Hailin Cong, Bin Wang
Summary: In this paper, a novel type of dual-wavelength confocal metalens is proposed to solve the spatial crosstalk between two wavelengths. The metalens can greatly reduce the spatial crosstalk and achieve high precision and efficiency in confocal imaging. It can also focus light in specific wavelength ranges, making it suitable for imaging, microscopy, and optical fiber communication.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Rui Qiu, Guanmao Zhang, Shaokai Du, Jie Liu, Hongyu Jib, Kaiyun Bi, Bochuan Xing, Guangchao Diao
Summary: Recent research has developed an achromatic metalens that shows potential for replacing traditional lenses. This study focuses on a continuously variable focus height broadband achromatic metalens for long-wavelength infrared applications. By optimizing materials and parameters, chromatic aberration is effectively corrected, making it suitable for high-resolution LWIR imaging and spectroscopy systems.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Marcos Troncoso-Costas, Gaurav Jain, Yiming Li, Mohammed Patel, Lakshmi Narayanan Venkatasubramani, Sean O'Duill, Frank Smyth, Andrew Ellis, Francisco Diaz-Otero, Colm Browning, Liam Barry
Summary: In this work, a fast-switching tuneable laser capable of wide wavelength coverage, low noise and linewidth levels suitable for high-order modulation formats is demonstrated. The laser is characterized to cover a wavelength range of 35 nm in the C-band with nanosecond switching time. It is used to successfully demonstrate 480 Gbit/s 16QAM transmission over 25 km of single-mode fiber for a wavelength range of 19 nm.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Takeshi Moriyasu, Masahiko Tani, Hideaki Kitahara, Takashi Furuya, Jessica Afalla, Toshiro Kohmoto, Daishiro Koide, Hiroki Sato, Mitsutaka Kumakura
Summary: Optical pump-terahertz probe spectroscopy was used to study the photocarrier dynamics and optical characteristics of semiconductor Si. The results showed that the thickness of Si influenced the transmitted terahertz field amplitude and peak delay time, indicating differences in photocarrier dynamics between different Si materials.
OPTICS COMMUNICATIONS
(2024)