Article
Physics, Multidisciplinary
Lin Zou, Zhiying Zhang, Haitao Yu, Zhi Zhong, Mingguang Shan, Lei Liu
Summary: A camouflaged cryptosystem based on optical diffractive imaging is proposed, which encodes a camouflaged image into an intensity image and a secret image into generated phase masks. The fake ciphertext and random phase masks are transmitted through a common channel, while the generated phase masks are transmitted through a private channel. Only authorized receivers with the fake ciphertext and generated phase masks can retrieve the secret image.
Article
Physics, Multidisciplinary
Mingguang Shan, Yanjun Xu, Zhi Zhong, Bin Liu, Lei Yu, Yongqiang Xie, Lei Liu
Summary: In this paper, an improved diffractive-imaging-based image encryption scheme in 3D space is presented. The plaintext is divided into sub-images using binary amplitude masks and then diffused into 3D space at different axial positions for encryption, disrupting the relation between the plaintext and ciphertext to counter chosen-plaintext attacks. A modified iterative retrieval algorithm is developed for decryption, achieving high-quality decrypted images. This cryptosystem enhances security without increasing the ciphertext amount, enlarges the key space to resist brute force attacks, and significantly reduces computation while retrieving high-quality decrypted images.
Article
Optics
Margie P. Olbinado, David M. Paganin, Yin Cheng, Alexander Rack
Summary: Advances in X-ray imaging have led to breakthroughs in various fields, but achieving high spatial resolution while reducing radiation dose remains challenging. Ghost imaging shows promise in reducing dose and achieving high resolution, but current protocols are limited in achieving phase contrast and image quality.
Article
Automation & Control Systems
Jingchun Zhou, Tongyu Yang, Weishen Chu, Weishi Zhang
Summary: This paper proposes a restoration method based on backscatter pixel prior and color cast removal for underwater images. Experimental results show that the proposed method improves the contrast and removes color deviation caused by light absorption.
ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE
(2022)
Article
Optics
Peter Kocsis, Igor Shevkunov, Vladimir Katkovnik, Heikki Rekola, Karen Egiazarian
Summary: The proposed method introduces a lensless single-shot phase retrieval approach that separates carrying and object wavefronts. By calibrating discrepancies between computational models and physical elements and implementing pixel super-resolution processing, it reconstructs the object wavefront with correction from the carrying wavefront, demonstrating robustness in simulations and experiments. In phase bio-imaging, it achieves high-quality imaging results and records dynamic scenes efficiently with the single-shot advantage.
Article
Computer Science, Information Systems
Bing Hong Woo, Mau-Luen Tham, Sing Yee Chua
Summary: This paper proposes an adaptive coarse-to-fine (C2F) sampling method to improve the image reconstruction quality in single pixel imaging (SPI), and a deep Generative Adversarial Network (GAN) model to improve time efficiency. The results show that the C2F sampling outperforms uniform sampling in terms of image quality, with improvement in efficiency achieved by the GAN reconstruction.
Article
Physics, Multidisciplinary
Deming Peng, Xuan Zhang, Yonglei Liu, Yimeng Zhu, Yahong Chen, Fei Wang, Yangjian Cai
Summary: This study demonstrates that the hidden image information behind a random scattering medium can be encoded in the complex spatial coherence structure of a partially coherent light beam. Experimental validation shows that the image information can be successfully recovered using spatial coherence measurement and an iterative phase retrieval algorithm. The reconstructed image not only captures the spatial shape but also provides information about the position, including lateral shift and longitudinal distances.
FRONTIERS IN PHYSICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Jie Meng, Shuting Wang, Gen Li, Liquan Jiang, Xiaolong Zhang, Chao Liu, Yuanlong Xie
Summary: This paper proposes an iterative-learning error compensation scheme for mobile manipulators in wide-area and multi-sites manufacturing scenarios. By integrating an improved localization and vision technique, an effective measurement system is developed to accurately obtain parking data and address the inadequate autonomous parking performance due to harsh industrial environments.
ROBOTICS AND COMPUTER-INTEGRATED MANUFACTURING
(2021)
Article
Computer Science, Information Systems
Yakun Gao, Yanbo Zhang, Haibin Li, Wenming Zhang
Summary: This paper introduces a dehazing algorithm that calculates transmission values for each pixel separately without assuming local consistency, optimizing them through iterations to achieve the best haze-free result.
MULTIMEDIA TOOLS AND APPLICATIONS
(2021)
Article
Engineering, Mechanical
Chun-Li Shao, Shuang-Long Yang, Yun-Zhi Huang, Ke-Jun Xu
Summary: An error model-based iterative compensation (EMIC) method is proposed to improve the accuracy of frequency response function (FRF) estimation. The EMIC method is generally convergent with small FRF pre-estimation error and appropriate window selection, but it may slightly increase noise uncertainty. Verification through model simulation and actual sensor data shows that EMIC method can effectively reduce FRF estimation error, especially in resonance frequency band, with acceptable time consumption.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Electrical & Electronic
Mengyu Jia, Zhaoqi Wei, Lequan Yu, Zhiyong Yuan, Feng Gao
Summary: Single pixel imaging (SPI) is a computational imaging modality that is widely used for sensing across the entire spectrum range. This work presents a novel learning-based SPI protocol that maintains outstanding robustness to noise under extremely low-light conditions. Experimental results demonstrate the superiorities of this strategy over other conventional SPI algorithms, especially in photon-limited scenarios found in fluorescence imaging.
IEEE TRANSACTIONS ON COMPUTATIONAL IMAGING
(2023)
Article
Optics
Yunhui Gao, Liangcai Cao
Summary: This work proposes a generalized algorithmic framework for pixel-super-resolved phase retrieval and introduces iterative projection algorithms and gradient descent algorithms to solve the problem. The Wirtinger-PSR algorithm, as an example, has been validated with simulated and experimental data and shows versatility in various physical settings, helping to bridge the gap between empirical studies and theoretical analyses.
Article
Optics
Ye Tian, Ying Fu, Jun Zhang
Summary: This paper proposes a novel compressive imaging approach based on Plug-and-Play algorithms for single-pixel imaging. By employing deep denoiser prior and combining with model-based algorithm advantage, it achieves higher quality image reconstruction.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Engineering, Biomedical
Zixiang Chen, Yaping Wu, Na Zhang, Tao Sun, Yu Shen, Hairong Zheng, Dong Liang, Meiyun Wang, Zhanli Hu
Summary: Dynamic positron emission tomography (dPET) is a widely used medical imaging technique for cancer diagnosis, staging, and therapy guidance. The reconstructed images with short frame durations often have limited image signal-to-noise ratio (SNR) and unsatisfactory image spatial resolution. The uEXPLORER PET scanner shows higher sensitivity and resolution, which may improve this issue. In this study, we proposed a dPET processing method that uses pixel-level time-activity curve (TAC) correction based on third-order Hermite interpolation (Pitch-In) for denoising images with short frame durations. The method demonstrated superior performance in reducing dPET image noise and improving imaging accuracy.
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Xianye Li, Yafei Sun, Yikang He, Xun Li, Baoqing Sun
Summary: A novel QPI scheme inspired by single-pixel camera (SPC) is proposed in this work, utilizing structured illumination and single-pixel signals for image reconstruction without prior information of the targets. The scheme exhibits great performance even with objects in an extremely rough phase distribution in both simulation and experiment.
Article
Optics
Yin Xiao, Lina Zhou, Wen Chen
Summary: This paper introduces a correspondence imaging approach for reconstructing high-quality objects through complex scattering media. By deriving a rectified theory and introducing temporal correction, the proposed method eliminates the effect of dynamic scaling factors. Experimental results demonstrate the advantages of the proposed method over conventional methods in complex scattering environments, and it can also be combined with other methods to further enhance the quality of reconstructed objects.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Zengxuan Jiang, Minghao Chao, Qingsong Liu, Bo Cheng, Guofeng Song, Jietao Liu
Summary: In this paper, a multi-focal metalens with high focusing efficiency controlled by circular polarization multiplexing is demonstrated. The metalens can generate four transversely distributed focal points under normal incidence of linearly polarized light, supporting both left-circularly polarized and right-circularly polarized conversion. Furthermore, an oblique incidence metalens is designed to achieve high total focusing efficiency for terahertz waves and provides potential new applications for polarization imaging and detection.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Yiran Wang, Yu Ji, Xuyang Zhou, Xiu Wen, Yutong Li, Zhengjun Liu, Shutian Liu
Summary: This work presents a new reconstruction framework for structured illumination microscopy (SIM), which only requires four raw images and avoids extensive iterative computation. By using checkerboard pattern illumination modulation instead of sinusoidal fringe illumination, the proposed method significantly reduces image acquisition time and achieves higher image reconstruction rate. Additionally, the reconstruction process is non-iterative and not limited by the field of view size.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Qian He, Li Pei, Jianshuai Wang, Jingjing Zheng, Tigang Ning, Jing Li
Summary: This paper proposes a 3D refractive index profile visualization method to demonstrate mode activation and evolution in fiber fusion splicing. The method is validated through experimental results and provides support for various fiber splicing operations and mode coupling modulation.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Qiwei Li, Qiyu Wang, Fang Lu, Yang Cao, Xu Zhao
Summary: LSHIP is a lenslet-array-based snapshot hyperspectral imaging polarimeter that combines spectral polarization modulation with integral field imaging spectrometry. It can simultaneously acquire three-dimensional spatial and spectral data-cubes for linear Stokes parameters in a single snapshot.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Huicong Li, Bing Lv, Meng Tian, Wenzhu Huang, Wentao Zhang
Summary: This study proposes a temperature compensation scheme for unbalanced interferometers using sensing fibers with different temperature coefficients, aiming to resolve the temperature disturbance and achieve high strain resolution. The experimental results confirm the effectiveness of the proposed scheme in high-resolution, long-term, low-frequency, and static strain sensing.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Hongxiang Chang, Rongtao Su, Yuqiu Zhang, Bowang Shu, Jinhu Long, Jinyong Leng, Pu Zhou
Summary: High-speed variable-focus optics provides new opportunities for fiber laser applications in various fields. This paper investigates a non-mechanical axial focus tuning method using coherent beam combining (CBC) technique and proposes a tilt modulation assisted method to extend the tuning range.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Yubo Ni, Shuai Fu, Chaoyang Su, Zhaozong Meng, Nan Gao, Zonghua Zhang
Summary: This paper proposes a surface adaptive fringe pattern generation method to accurately measure specular surfaces, eliminating the out-of-focus effect and improving measurement accuracy and reliability.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Zifan Wang, Tianfeng Zhou, Qian Yu, Zihao Zeng, Xibin Wang, Junjian Hu, Jiyong Zeng
Summary: Fast-axis collimation (FAC) lens arrays are crucial in laser systems, and their precision can be improved through the development of an optical collimation system and the use of thermal compensation to correct for non-uniform thermal expansion.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Jincheng Chen, Qiuyu Fang, Li Huang, Xin Ye, Luhong Jin, Heng Zhang, Yinqian Luo, Min Zhu, Luhao Zhang, Baohua Ji, Xiang Tian, Yingke Xu
Summary: This study developed a novel deep learning accelerated SRRF method that enables super-resolution reconstruction with only 5 low SNR images, and allows real-time visualization of microtubule dynamics and interactions with CCPs.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Pan Liu, Yongqiang Zhao, Ning Li, Kai Feng, Seong G. Kong, Chaolong Tang
Summary: This article presents a technique for inverse design of multilayer deep-etched gratings (MDEG) using a deep neural network with adaptive solution space. The proposed method trains a deep neural network to predict the probability distribution across the discretized space, enabling evaluation of an optimal solution. The results show improved efficiencies using only a reduced dataset and avoiding one-to-many mapping challenges.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Evelina Bibikova, Nazar Al-wassiti, Nataliya Kundikova
Summary: Light beams possess three types of angular momentum, namely spin angular momentum, extrinsic orbital angular momentum, and intrinsic orbital angular momentum. The interaction between these momenta leads to the spin-orbit interaction of light and topological effects. This study predicts a new topological effect resulting from the influence of extrinsic orbital angular momentum on spin angular momentum in converging asymmetrical light beams. It manifests as the transformation of linear polarized light into elliptically polarized light when an asymmetrical beam passes through the left or right half of the focal plane. The measured value of the topological circular amplitude anisotropy R was found to be R = +/- (0.60 +/- 0.08) x 10(-3). This new effect contributes to our understanding of light and has potential applications in developing sensors in optics.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Hamdy H. Wahba
Summary: This study combines multiple-beam Fizeau interference and single-shot digital holographic interferometry to study thick phase objects. By collecting optical phase at different focal planes, the angular spectrum method is used for the first time to retrieve optical phase maps through the focal depth. The proposed method proves to be effective in providing accurate numerical focusing and phase maps reconstruction.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Mohammed A. Isa, Richard Leach, David Branson, Samanta Piano
Summary: Due to the complexity of resolving object form and pose in images, new vision algorithms prioritize identification and perception over accurate coordinate measurement. However, the use of planar targets for coordinate measurement in vision systems has several drawbacks, including calibration difficulties and limited viewing angles. On the other hand, the use of sphere targets is infrequent in vision-based coordinate metrology due to the lack of efficient multi-view vision algorithms for accurate sphere measurements.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Ildar Rakhmatulin, Donald Risbridger, Richard M. Carter, M. J. Daniel Esser, Mustafa Suphi Erden
Summary: This paper reviews the application of machine learning in laser systems. While machine learning has been widely used in general control automation and adjustment tasks, its application in specific tasks requiring skilled workforces for high-precision equipment assembly and adjustment is still limited. The paper presents promising research directions for using machine learning in mirror positional adjustment, triangulation, and optimal laser parameter selection, based on the recommendations of PRISMA.
OPTICS AND LASERS IN ENGINEERING
(2024)