Article
Physics, Applied
Ling-Yu Dou, Li-Qing Ren, De-Zhong Cao, Xin-Bing Song
Summary: This study presents a method of thermal-light ghost imaging without conventional intensity correlation calculation, achieving image reconstruction by setting thresholds for detectors. The work expands the applicability of ghost imaging reconstruction methods and provides a potential approach for ghost imaging with binary detectors in low-light or photon-counting regimes and a broader spectrum.
PHYSICAL REVIEW APPLIED
(2021)
Article
Optics
Huan Cui, Jie Cao, Qun Hao, Dong Zhou, Mingyuan Tang, Kaiyu Zhang, Yingqiang Zhang
Summary: The research proposes an omnidirectional ghost imaging system that can achieve a 360 degrees omnidirectional field of view with the addition of a curved mirror, obtaining undistorted and unwrapping-free panoramic images with uniform resolution.
Article
Optics
Xianwei Huang, Wei Tan, Teng Jiang, Suqin Nan, Yanfeng Bai, Xiquan Fu
Summary: This paper proposes a free space optical (FSO) communications system based on ghost imaging, and numerically investigates the signal transmission through a 1 km horizontal turbulent channel. The information is modulated and encoded into binary numbers by ghost imaging with object light quantization, and transmitted to a receiver with vortex beams. The performance of the communications system depends on the repeating times of ghost imaging, and higher repeating times contribute to improved security and communications performance.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Optics
Anrun Yang, Yuan Zhang, Lirong Ren, Fangqiong Li, Yuanyuan Wu, Lei Wu, Dejian Zhang, Jiangtao Liu
Summary: This study examines the influence of negative and positive film imaging on ghost imaging quality. The results show that when the object to be imaged is black and white, negative film provides significantly better imaging effect than positive film, increasing the contrast to noise ratio by about 241% or reducing the sampling times by 5 under the same image quality. The main reason is the greater absolute and relative intensity fluctuation in negative film imaging. When the object to be imaged is in color, using a reverse color light source with the background color of the object can achieve a similar negative imaging effect, improving the imaging quality and increasing the contrast to noise ratio by 52%-69%.
Article
Computer Science, Artificial Intelligence
Qingsen Yan, Dong Gong, Javen Qinfeng Shi, Anton van den Hengel, Chunhua Shen, Ian Reid, Yanning Zhang
Summary: DAHDRNet is a novel dual-attention-guided deep neural network that produces high-quality ghost-free HDR images by utilizing spatial attention and feature channel attention. It effectively addresses the challenges caused by moving objects and misalignments, guiding the merging process based on a reference image.
INTERNATIONAL JOURNAL OF COMPUTER VISION
(2022)
Article
Optics
Hao Zhang, Deyang Duan
Summary: A new turbulence-immune computational ghost imaging method utilizing a multi-scale generative adversarial network (MsGAN) is introduced in this article. By optimizing the traditional CGI coincidence measurement algorithm using MsGAN, a satisfactory ghost image can be reconstructed through network training, with significantly improved visual effects.
Article
Physics, Fluids & Plasmas
I Predebon, D. Abate, L. Pigatto
Summary: In this study, we conducted a comparative analysis of achievable positive and negative triangularity configurations in the next RFX-mod2 tokamak campaign. By mirroring the designed single-null positive triangularity plasmas based on previous scenarios, we investigated the modifications in local and global geometric properties of the plasma and their effects on vertical stability, low-n ideal stability, and electrostatic turbulence level.
Article
Quantum Science & Technology
Jonte R. Hance, John Rarity
Summary: The protocol presents a ghost imaging method that maintains counterfactuality, ensuring no interaction between light and the imaged object. In the infinite limit, this method allows imaging of light-sensitive objects without damaging them, while in general, it offers significant improvement in visibility and signal-to-noise ratio compared to previous protocols.
NPJ QUANTUM INFORMATION
(2021)
Article
Optics
Baolei Liu, Fan Wang, Chaohao Chen, Fei Dong, David Mcgloin
Summary: Ghost imaging captures 2D images using a point detector instead of an array sensor, offering the potential to image objects in turbid media and bypass offline processing. The self-evolving ghost imaging strategy evaluates and generates illumination patterns in real time, updating the object's image at a rapid rate. SEGI demonstrates robust imaging capabilities for static and moving objects, surpassing traditional computational ghost imaging in terms of imaging power and adaptability.
Article
Optics
Huazhe Wei, Kaiqi Zhu, Minghui Zhang, Yangjian Cai, Xianlong Liu
Summary: This study investigates the impact of atmospheric turbulence on the quality of ghost imaging through numerical simulations and experimental measurements. It is found that increasing the topological charge can improve the image quality. The results of this study are significant for free space optical communication and information encryption.
Article
Optics
Leihong Zhang, Yunjie Zhai, Runchu Xu, Kaimin Wang, Dawei Zhang
Summary: This paper investigates the impact of atmospheric turbulence on the image acquisition process and uses computational ghost imaging to simulate the process. The study finds that good reconstruction results can be obtained using an end-to-end neural network at low sampling rates and extreme conditions.
Article
Optics
Zhiyuan Ye, Peixia Zheng, Wanting Hou, Dian Sheng, Weiqi Jin, Hong-Chao Liu, Jun Xiong
Summary: This paper introduces a new technology called computational convolutional ghost imaging (CCGI), which uses a single-pixel photodetector and structured illumination to perform convolution operations, enabling direct observation of the features of interest in a target without imaging. The CCGI scheme can adaptively work under sub-Nyquist sampling conditions and is suitable for real-time non-imaging edge detection.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Optics
Zhe Yang, Kexin Huang, Machi Zhang, Dong Ruan, Junlin Li
Summary: This study proposes a new experimentally verified ghost imaging mechanism called derivative GI. By using the derivatives of the intensities of the test light and the reference light, multiple independent signals can be obtained in one measurement. The combination of derivative GI and the standard GI algorithm reduces the number of measurements and the time required for data acquisition and imaging, making it suitable for on-chip implementation.
CHINESE OPTICS LETTERS
(2022)
Article
Optics
Huan Cui, Jie Cao, Qun Hao, Dong Zhou, Haoyu Zhang, Yingqiang Zhang
Summary: Panoramic ghost imaging (PGI) is a novel method that uses a curved mirror to expand the field of view (FOV) of ghost imaging (GI) to 360 degrees, allowing GI to break through in applications with a wide FOV. However, achieving high-resolution PGI with high efficiency is a challenge due to the large amount of data. Therefore, a foveated panoramic ghost imaging (FPGI) method is proposed to achieve a wide FOV, high resolution, and high efficiency by reducing resolution redundancy and promoting the practical applications of GI with a wide FOV.
Article
Optics
Jinfen Liu, Le Wang, Shengmei Zhao
Summary: In this paper, a novel spread spectrum ghost imaging (SSGI) scheme is proposed to overcome the environmental interference that degrades image quality in traditional ghost imaging systems. By treating the system as a communication system and using a direct sequence code for modulation and correlation, SSGI demonstrates stronger noise resistance and better performance with longer code lengths.
