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A Nonlocal Total Variation Model for Image Decomposition: Illumination and Reflectance

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Numerical Mathematics(Theory,Methods and Applications) 2014年第3期7卷 334-355页

作者： Wei Wang michael k.ng Department of Mathematics Tongji UniversityShanghaiChina Department of Mathematics Hong Kong Baptist UniversityKowloon TongHong Kong

In this paper,we study to use nonlocal bounded variation(NLBV)techniques to decompose an image intensity into the illumination and reflectance *** considering spatial smoothness of the illumination component and nonlocal total variation(NLTV)of the reflectance component in the decomposition framework.an energy functional is *** establish the theoretical results of the space of NLBV functions such as lower semicontinuity,approximation and *** essential properties of NLBV functions are important tools to show the existence of solution of the proposed energy *** results on both grey-level and color images are shown to illustrate the usefulness of the nonlocal total variation image decomposition model,and demonstrate the performance of the proposed method is better than the other testing methods.

关键词： Image decomposition illumination reflectance nonlocal total variation iterative method

k.rnel Density Estimation Based Multiphase Fuzzy Region Competition Method for Texture Image Segmentation

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Communications in Computational Physics 2010年第8期8卷 623-641页

作者： Fang Li michael k.ng Department of Mathematics East China Normal UniversityShanghai 200241China Centre for Mathematical Imaging and Vision and Department of Mathematics Hong Kong Baptist UniversityKowloon TongHong Kong

In this paper,we propose a multiphase fuzzy region competition model for texture image *** the functional,each region is represented by a fuzzy membership function and a probability density function that is estimated by a nonparametric k.rnel density *** overall algorithm is very efficient as both the fuzzy membership function and the probability density function can be implemented *** apply the proposed method to synthetic and natural texture images,and synthetic aperture radar *** experimental results have shown that the proposed method is competitive with the other state-of-the-art segmentation methods.

关键词： Texture multiphase region competition k.rnel density estimation fuzzy membership function total variation

Parallel Active Subspace Decomposition for Tensor Robust Principal Component Analysis

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Communications on Applied Mathematics and Computation 2021年第2期3卷 221-241页

作者： michael k.ng Xue-Zhong Wang Department of Mathematics The University of Hong KongHong KongChina School of Mathematics and Statistics Hexi University734000 ZhangyeGansu ProvinceChina

Tensor robust principal component analysis has received a substantial amount of attention in various *** existing methods,normally relying on tensor nuclear norm minimization,need to pay an expensive computational cost due to multiple singular value decompositions at each *** overcome the drawback.we propose a scalable and efficient method,named parallel active subspace decomposition,which divides the unfolding along each mode of the tensor into a columnwise orthonormal matrix(active subspace)and another small-size matrix in *** a transformation leads to a nonconvex optimization problem in which the scale of nuclear norm minimization is generally much smaller than that in the original *** solve the optimization problem by an alternating direction method of multipliers and show that the iterates can be convergent within the given stopping criterion and the convergent solution is close to the global optimum solution within the prescribed *** results are given to demonstrate that the performance of the proposed model is better than the state-of-the-art methods.

关键词： Principal component analysis Low-rank.tensors Nuclear norm minimization Active subspace decomposition Matrix factorization

Lipschitz and Total-Variational Regularization for Blind Deconvolution

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Communications in Computational Physics 2008年第6期4卷 195-206页

作者： Yu-Mei Huang michael k.ng Centre for Mathematical Imaging and Vision and Department of Mathematics Hong Kong Baptist UniversityKowloon TongHong Kong. Department of Mathematics Lanzhou UniversityGansuChina.

In[3],Chan and Wong proposed to use total variational regularization for both images and point spread functions in blind *** experimental results show that the detail of the restored images cannot be *** this paper,we consider images in Lipschitz spaces,and propose to use Lipschitz regularization for images and total variational regularization for point spread functions in blind *** experimental results show that such combination of Lipschitz and total variational regularization methods can recover both images and point spread functions quite well.

关键词： Lipschitz regularization total variational regularization blind deconvolution texture Poisson singular integral alternating iterative algorithm.

Ending as Beginning： Chinese Translations of Edward Bellamy＇s Utopian Novel Look.ng Back.ard： 2000-1887

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Frontiers of Literary Studies in China-Selected Publications from Chinese Universities 2016年第1期10卷 9-35页

作者： k.nny k. k. ng Department of Chinese and History The City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong China

The Chinese translation of Edward Bellamy＇s Look.ng Back.ard.. 2000-1887（1887） at the turn of the twentieth century has been little studied, in spite of Bellamy＇s obvious influence on Chinese intellectuals and reformist think.rs Enthusiastically embraced by the intelligentsia as a gospel of social change, the utopian fiction has inspired subsequent Chinese writings of science fantasy in popular fiction. Bellamy＇s tale centers on the adventure of time-traveler Julian West, a young Bostonian who is put into a hypnotic sleep in the late nineteenth century and awak.ns in the year 2000 in a socialist utopia. He discovers an ideally realized vision of the future, one unthink.ble in his own century. This article argues that Chinese translators, in their conventional form of storytelling, have intentionally converted Bellamy＇s original religious prophesy into a vision of a new and modernized state that is in line with the Chinese evolutionary historical imagination. It discusses the problematic of imagining the future by delineating the relationships of utopianism, social modernity, and temporality as the novel was written by an engaged American writer and then rendered into various Chinese versions by Western missionaries, Chinese intellectuals, and popular writers.

关键词： apocalyptic fiction dream Edward Bellamy Evolutionism fantastic,futuristic world translation utopia

NUMERICAL STUDIES OF A CLASS OF COMPOSITE PRECONDITIONERS

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Journal of Computational Mathematics 2014年第2期32卷 136-151页

作者： Qiang Niu michael ng Mathematics and Physics Centre Xi'an Jiaotong-Liverpool University Suzhou 215123 China Department of Mathematics Hong Kong Baptist University Kowloon Tong Hong Kong

In this paper, we study a composite preconditioner that combines the modified tangential frequency filtering decomposition with the ILU（O） factorization. Spectral property of the composite preconditioner is examined by the approach of Fourier analysis. We illustrate that condition number of the preconditioned matrix by the composite preconditioner is asymptotically bounded by O（hp -2/3） on a standard model problem. Performance of the composite preconditioner is compared with other preconditioners on several problems arising from the discretization of PDEs with discontinuous coefficients. Numerical results show that performance of the proposed composite preconditioner is superior to other relative preconditioners.

关键词： Preconditioner ILU Tangential frequency filtering decomposition GMRES.

A prospective cohort of men with localized prostate cancer on active surveillance protocol in Hong k.ng,China:what did we learn?

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Asian Journal of Andrology 2024年第3期26卷 245-249页

作者： Xiaobo Wu Ivan Ching-Ho k. Cindy Yeuk.Lam Hong Samuel Chi-Hang Yee Jeremy Yuen-Chun Teoh Samson Yun-Sang Chan Ho-Man Tam Chi-k.ok.Chan Chi-Fai ng Peter k.-Fung Chiu SH Ho Urology Centre Department of SurgeryFaculty of MedicineThe Chinese University of Hong KongHong KongChina

This study aimed to report the outcomes of active surveillance(AS)in the management of low-risk.prostate cancer(PCa).It recruited87 men who were prospectively followed up according to the Prostate Cancer Research International Active Surveillance(PRIAS)protocol with local adaptation at SH Ho Urology Centre,Prince of Wales Hospital,Hong k.ng,*** investigated the predictorsof disease progression and found that baseline prostate-specific antigen density(PSAD)and the presence of the highest ProstateImaging-Reporting and Data System(PI-RADS)score 5 lesion on magnetic resonance imaging(MRI)are significantly correlatedwith disease ***,men with PSAD>0.2 ng ml^(−2)or PI-RADS 4 or 5 lesions had significantly worse upgradingfree survival compared to those with PSAD≤0.2 ng ml−2 and PI-RADS 2 or 3 *** study concludes that AS is a safe andeffective management strategy for selected patients to defer radical treatment and that most disease progression can be detectedafter the first repeated *** combination of PSAD>0.2 ng ml^(−2)and PI-RADS 4 or 5 lesions may serve as a useful predictorof early disease progression and provide a guide to optimize follow-up protocols for men in different risk.groups.

关键词： active surveillance cohort localized prostate cancer

Application of artifcial intelligence in cataract management:current and future directions

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Eye and Vision 2024年第1期10卷 21-30页

作者： Laura Gutierrez Jane Sujuan Lim Li Lian Foo Wei Yan ng Michelle Yip Gilbert Yong San Lim Melissa Hsing Yi Wong Allan Fong Mohamad Rosman Jodhbir Singth Mehta Haotian Lin Darren Shu Jeng Ting Daniel Shu Wei Ting Singapore Eye Research Institute SingaporeSingapore Singapore National Eye Center 11 Third Hospital AvenueSingapore 168751Singapore Academic Ophthalmology School of MedicineUniversity of NottinghamNottinghamUK Zhongshan Ophthalmic Center Sun Yet Sen UniversityGuangzhouChina

The rise of artifcial intelligence(AI)has brought break.hroughs in many areas of *** ophthalmology,AI has delivered robust results in the screening and detection of diabetic retinopathy,age-related macular degeneration,glaucoma,and retinopathy of *** management is another feld that can beneft from greater AI *** is the leading cause of reversible visual impairment with a rising global clinical *** diagnosis,monitoring,and surgical management are necessary to address this *** addition,patients in large developing countries often sufer from limited access to tertiary care,a problem further exacerbated by the ongoing COVID-19 *** on the other hand,can help transform cataract management by improving automation,efcacy and overcoming geographical ***,AI can be applied as a telediagnostic platform to screen and diagnose patients with cataract using slit-lamp and fundus *** utilizes a deep-learning,convolutional neural network.CNN)to detect and classify referable cataracts ***,some of the latest intraocular lens formulas have used AI to enhance prediction accuracy,achieving superior postoperative refractive results compared to traditional ***,AI can be used to augment cataract surgical sk.ll training by identifying diferent phases of cataract surgery on video and to optimize operating theater work.ows by accurately predicting the duration of surgical ***,some AI CNN models are able to efectively predict the progression of posterior capsule opacifcation and eventual need for YAG laser *** advances in AI could transform cataract management and enable delivery of efcient ophthalmic *** k.y challenges include ethical management of data,ensuring data security and privacy,demonstrating clinically acceptable performance,improving the generalizability of AI models across heterogeneous populations,and improving the trust of e

关键词： Artifcial intelligence Telemedicine Cataract Cataract screening Cataract surgery IOL calculations Biometry Machine learning

Development of an industrial Internet of things suite for smart factory towards re-industrialization

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Advances in Manufacturing 2017年第4期5卷 335-343页

作者： C. k. M. Lee S. Z. Zhang k. k. H. ng Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Hong Kong People's Republic of China Department of Information Management Zhejiang University of Finance and Economics Hangzhou 310018Zhejiang People's Republic of China

Re-industrialization, which supports industrial upgrading and transformation, promotes smart production and high value-added manufacturing processes, and helps to create new momentum for the economic. Under the current situation, industrialists encounter several chal- lenges to achieve re-industrialization. Firstly, the cost and technical thresholds for industrialists to leverage emerging technologies are high. Secondly, there are huge quantities and numerous types of Internet of things （IoT） devices in smart factories, warehouses and offices. The enormous extents of data exchange and communication, manage- ment, monitoring and control of IoT devices as well as the establishment and maintenance of a reliable cloud platform hinder industrialists to implement an integrated smart production management. Therefore, to achieve re-indus- trialization, an industrial Internet of things （IIoT） suite consisting of a micro-services-based IIoT cloud platform and IIoT-based smart hub is proposed, which helps to materialize re-industrialization and to conduct industrial upgrading and transformation to achieve smart production and high value-added manufacturing processes.

关键词： Industrial Intemet of things (IIoTs) Cloudplatform Micro-services-based Industry 4.0 Reindustrialization