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871 results on '"Xie Zhihua"'

11. Super-resolution imaging through a multimode fiber: the physical upsampling of speckle-driven

Author

Zhang, Chuncheng, Liu, Tingting, Xie, Zhihua, Wang, Yu, Liu, Tong, Chen, Qian, and Sui, Xiubao

Subjects
Physics - Optics, Electrical Engineering and Systems Science - Image and Video Processing, Physics - Medical Physics
Abstract

Following recent advancements in multimode fiber (MMF), miniaturization of imaging endoscopes has proven crucial for minimally invasive surgery in vivo. Recent progress enabled by super-resolution imaging methods with a data-driven deep learning (DL) framework has balanced the relationship between the core size and resolution. However, most of the DL approaches lack attention to the physical properties of the speckle, which is crucial for reconciling the relationship between the magnification of super-resolution imaging and the quality of reconstruction quality. In the paper, we find that the interferometric process of speckle formation is an essential basis for creating DL models with super-resolution imaging. It physically realizes the upsampling of low-resolution (LR) images and enhances the perceptual capabilities of the models. The finding experimentally validates the role played by the physical upsampling of speckle-driven, effectively complementing the lack of information in data-driven. Experimentally, we break the restriction of the poor reconstruction quality at great magnification by inputting the same size of the speckle with the size of the high-resolution (HR) image to the model. The guidance of our research for endoscopic imaging may accelerate the further development of minimally invasive surgery.

Published
2023

12. Dynamic mutation enhanced greedy strategy for wavefront shaping

Author

Zhang, Chuncheng, Sui, Xiubao, Yao, Zheyi, Gu, Guohua, Chen, Qian, Xie, Zhihua, Xiong, Zhihua, and Liu, Guodong

Subjects
Physics - Optics, Mathematics - Optimization and Control
Abstract

Optical focusing through scattering media has important implications for optical applications in medicine, communications, and detection. In recent years, many wavefront shaping methods have been successfully applied to the field, among which the population optimization algorithm has achieved remarkable results. However, the current population optimization algorithm has some drawbacks: 1. the offspring do not fully inherit the good genes from the parent. 2. more efforts are needed to tune the parameters. In this paper, we propose the mutate greedy algorithm. It combines greedy strategies and real-time feedback of mutation rates to generate offspring. In wavefront shaping, people can realize high enhancement and fast convergence without a parameter-tuning process.

Published
2022

15. Fast optical refocusing through multimode fiber bend using Cake-Cutting Hadamard encoding algorithm to improve robustness

Author

Zhang, Chuncheng, Yao, Zheyi, Qin, Zhengyue, Gu, Guohua, Chen, Qian, Xie, Zhihua, Liu, Guodong, and Sui, Xiubao

Subjects
Physics - Optics, Electrical Engineering and Systems Science - Image and Video Processing
Abstract

Multimode fibres offer the advantages of high resolution and miniaturization over single mode fibers in the field of optical imaging. However, multimode fibre's imaging is susceptible to perturbations of MMF that can lead to secondary spatial distortions in the transmitted image. Perturbations include random disturbances in the fiber as well as environmental noise. Here, we exploit the fast focusing capability of the Cake-Cutting Hadamard coding algorithm to counteract the effects of perturbations and improve the system's robustness. Simulation shows that it can approach the theoretical enhancement at 2000 measurements. Experimental results show that the algorithm can help the system to refocus in a short time when MMFs are perturbed. This research will further contribute to using multimode fibres in medicine, communication, and detection.

Published
2022

35. Micro-expression Recognition Based on Dual-Branch Swin Transformer Network

Author

Xie, Zhihua, Zhao, Chuwei, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Huang, De-Shuang, editor, Premaratne, Prashan, editor, Jin, Baohua, editor, Qu, Boyang, editor, Jo, Kang-Hyun, editor, and Hussain, Abir, editor

Published
2023
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36. Micro-expression Recognition Based on Local Optical Flow Capsule Network

Author

Xie, Zhihua, Liu, Xiaoyu, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Fujita, Hamido, editor, Wang, Yinglin, editor, Xiao, Yanghua, editor, and Moonis, Ali, editor

Published
2023
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37. Photoacoustic Imaging in Inflammation Research

Author

Chen, Jingqin, Xie, Zhihua, Song, Liang, Gong, Xiaojing, Liu, Chengbo, Parnham, Michael J., Series Editor, Maier, Thorsten J., Series Editor, Ricciotti, Emanuela, Series Editor, Matrone, Carmela, Series Editor, Man, Francis, editor, and Cleary, Simon J., editor

Published
2023
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39. Functional evolution of the trace amine associated receptors in mammals and the loss of TAAR1 in dogs

Author

Westmoreland Susan V, Xie Zhihua, Vallender Eric J, and Miller Gregory M

Subjects
Evolution, QH359-425
Abstract

Abstract Background The trace amine associated receptor family is a diverse array of GPCRs that arose before the first vertebrates walked on land. Trace amine associated receptor 1 (TAAR1) is a wide spectrum aminergic receptor that acts as a modulator in brain monoaminergic systems. Other trace amine associated receptors appear to relate to environmental perception and show a birth-and-death pattern in mammals similar to olfactory receptors. Results Across mammals, avians, and amphibians, the TAAR1 gene is intact and appears to be under strong purifying selection based on rates of amino acid fixation compared to neutral mutations. We have found that in dogs it has become a pseudogene. Our analyses using a comparative genetics approach revealed that the pseudogenization event predated the emergence of the Canini tribe rather than being coincident with canine domestication. By assessing the effects of the TAAR1 agonist β-phenylethylamine on [3H]dopamine uptake in canine striatal synaptosomes and comparing the degree and pattern of uptake inhibition to that seen in other mammals, including TAAR1 knockout mice, wild type mice and rhesus monkey, we found that the TAAR1 pseudogenization event resulted in an uncompensated loss of function. Conclusion The gene family has seen expansions among certain mammals, notably rodents, and reductions in others, including primates. By placing the trace amine associated receptors in an evolutionary context we can better understand their function and their potential associations with behavior and neurological disease.

Published
2010
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