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1-Bit compressive sensing: Reformulation and RRSP-based sign recovery theory

Science China Mathematics 2016年第10期59卷 2049-2074页

作者： zhao yunbin XU ChunLei School of Mathematics University of Birmingham

Recently, the 1-bit compressive sensing （1-bit CS） has been studied in the field of sparse signal recovery. Since the amplitude information of sparse signals in 1-bit CS is not available, it is often the support or the sign of a signal that can be exactly recovered with a decoding method. We first show that a necessary assumption （that has been overlooked in the literature） should be made for some existing theories and discussions for 1-bit CS. Without such an assumption, the found solution by some existing decoding algorithms might be inconsistent with 1-bit measurements. This motivates us to pursue a new direction to develop uniform and nonuniform recovery theories for 1-bit CS with a new decoding method which always generates a solution consistent with 1-bit measurements. We focus on an extreme case of 1-bit CS, in which the measurements capture only the sign of the product of a sensing matrix and a signal. We show that the 1-bit CS model can be reformulated equivalently as an t0-minimization problem with linear constraints. This reformulation naturally leads to a new linear-program-based decoding method, referred to as the 1-bit basis pursuit, which is remarkably different from existing formulations. It turns out that the uniqueness condition for the solution of the 1-bit basis pursuit yields the so-called restricted range space property （RRSP） of the transposed sensing matrix. This concept provides a basis to develop sign recovery conditions for sparse signals through 1-bit measurements. We prove that if the sign of a sparse signal can be exactly recovered from 1-bit measurements with 1-bit basis pursuit, then the sensing matrix must admit a certain RRSP, and that if the sensing matrix admits a slightly enhanced RRSP, then the sign of a k-sparse signal can be exactly recovered with 1-bit basis pursuit.

关键词： 1-bit compressive sensing restricted range space property 1-bit basis pursuit linear program,l0-minimization sparse signal recovery

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Improved RIP-based bounds for guaranteed performance of two compressed sensing algorithms

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Science China Mathematics 2023年第5期66卷 1123-1140页

作者： yunbin zhao Zhiquan Luo Shenzhen Research Institute of Big Data The Chinese University of Hong KongShenzhenShenzhen 518172China

Iterative hard thresholding(IHT)and compressive sampling matching pursuit(CoSaMP)are two mainstream compressed sensing algorithms using the hard thresholding *** guaranteed performance of the two algorithms for signal recovery was mainly analyzed in terms of the restricted isometry property(RIP)of sensing *** present,the best known bound using the RIP of order 3k for guaranteed performance of IHT(with the unit stepsize)isδ3k<1/√3≈0.5774,and the bound for CoSaMP using the RIP of order 4k isδ4k<0.4782.A fundamental question in this area is whether such theoretical results can be further *** purpose of this paper is to affirmatively answer this question and to rigorously show that the abovementioned RIP bound for guaranteed performance of IHT can be significantly improved toδ3k<(√5−1)/2≈0.618,and the bound for CoSaMP can be improved toδ4k<0.5102.

关键词： iterative hard thresholding compressive sampling matching pursuit compressed sensing guaranteed performance restricted isometry property

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Formation and growth mechanisms of ultrafine particles in sludge-incineration flue gas

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Waste Disposal and Sustainable Energy 2019年第2期1卷 143-150页

作者： Yanlong Li Jiaqi Man Zhengquan Fang yunbin zhao Feng Wang Rundong Li Key Laboratory of Clean Energy College of Energy and EnvironmentShenyang Aerospace UniversityNo.37 Daoyi South AvenueDaoyi Development DistrictShenyang 110136LiaoningPeople’s Republic of China

Atmospheric particulate matter with diameter<2.5μm now makes up much of the air pollution in China,but it is the ultrafine particles(UFPs)with diameter<90 nm that are of particular *** is because UFPs are strongly linked with human health for two reasons:they contain a variety of hazardous substances and they can deeply penetrate human respiratory ***,scanning electron microscopy combined with X-ray dispersive energy spectrometry was used to characterize the morphology and surface texture,as well as the elemental composition of 60 *** UFPs was generated in a sewage sludge-incineration power plant in Zhejiang *** was done to determine the microstructure of the ultrafine particles and to follow the evolution of particle surface elemental composition with increasing particle ***,a comparison of the characteristic time for nucleation,condensation and coagulation was done to estimate the dominant *** results show that the UFPs have generally irregular shapes(cotton-like,irregular balls,sheets,etc.)and that they usually aggregate to form a *** increase in the size of a UFP,the mass fraction of the elements presents clearly changed:Na,K and Fe gradually decreased;while Ca,Si and Al,as well as the heavy metals Cu,Zn and Ni *** time estimation is a convenient and effective tool for identifying the predominant mechanisms during *** this study,calculations of characteristic time were used to reveal a mechanism of vaporization,nucleation,condensation and coagulation,which drives the formation and growth of ultrafine particles.

关键词： Ultrafine particle Characteristic time Nucleation Condensation Coagulation

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Alternative Theorems and Sufficient Conditions of Global Convergence for a Class of Feasible Direction Algorithms

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Systems Science and Systems Engineering 1993年第3期3卷 266-272页

作者： zhao yunbin Chongqing Industry and Management Institute, Chongqing 630050, China

In this paper, two alternative theorems which differ from Theorem 10.2.6 in [1] and Theorem 1 in [3] are presented for a class of feasible direction algorithms. On the basis of alternative theorems, furthermore, two s... 详细信息

关键词： alternative theorem feasible direction algorithm sufficiently certain function global convergence gradient projection.

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Global　and　Superlinear　Convergence　for　Generalized　Broyden＇s　Class　Methods

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Systems Science and Systems Engineering 1994年第2期4卷 175-184页

作者： zhao yunbin(Chongqing Industry and Management Institute. Chongqing, 630050. China)

Generalized Broyden’s class methods Presented by this paper is a new class Newton-like method. The global and superlinear convergence Of the method with inexact and exact line search are proved, when applied to a uni... 详细信息

关键词： unconstrained optimization generalized Broyden’s class method global and superlinearconvergence. Wolfe rule.

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基于半监督生成式对抗网络的异常行为检测

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南京邮电大学学报（自然科学版） 2020年第4期40卷 50-56页

作者：朱松豪赵云斌南京邮电大学自动化学院、人工智能学院江苏南京210023

针对简单的、人为规定的异常行为,对基于半监督的生成式对抗网络GANomaly进行了改进,并将其应用于视频异常行为检测。具体说来,为了使神经网络更加鲁棒,利用标签平滑可以促使网络产生更紧密的类内的聚类和更大的类别间的分离;为了防止... 详细信息

针对简单的、人为规定的异常行为,对基于半监督的生成式对抗网络GANomaly进行了改进,并将其应用于视频异常行为检测。具体说来,为了使神经网络更加鲁棒,利用标签平滑可以促使网络产生更紧密的类内的聚类和更大的类别间的分离;为了防止模型崩溃并加快模型的收敛速度,在对抗训练中采用最小二乘损失函数,而不是二分类交叉熵损失函数;为使生成网络更精确地刻画行为的外观信息,在重构损失中施加强度损失和梯度损失。在含有类别标记信息的公共数据集UCSD datasets上测试和证明这一方法的稳定性和准确性,并与几个经典的异常行为检测方法和原始的GANomaly进行了对比,实验结果证明所提出的方法更适合异常检测,且进一步提高了异常行为检测模型的稳定性和准确率。

关键词：异常行为检测半监督生成式对抗网络标签平滑

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融合空间相关性和局部特征转换器的遮挡行人重识别

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南京邮电大学学报（自然科学版） 2022年第5期42卷 62-73页

作者：朱松豪赵云斌焦淼南京邮电大学自动化学院、人工智能学院江苏南京210023 山东鲁能泰山电缆有限公司特变电工山东新泰271219

遮挡的行人重识别是计算机视觉中的一个挑战性领域,它面临着特征表示效率低下和识别准确率低等问题。卷积神经网络方法更注重局部特征的提取,因此难以提取被遮挡行人的特征,效果也不尽如人意。最近,视觉转换器被引入到重识别领域,并通... 详细信息

遮挡的行人重识别是计算机视觉中的一个挑战性领域,它面临着特征表示效率低下和识别准确率低等问题。卷积神经网络方法更注重局部特征的提取,因此难以提取被遮挡行人的特征,效果也不尽如人意。最近,视觉转换器被引入到重识别领域,并通过构建图像块序列之间的全局特征联系取得了最先进的结果。然而,视觉转换器在提取局部特征方面的性能不如卷积神经网络。因此,设计了一个基于空间相关性和局部特征序列的行人重识别网络。所提出的网络利用3个模块来提高视觉转换器的效率:(1)图像块全维度增强模块。设计了一个与图像块序列大小相同的可学习张量,该张量是全维的,并可完全嵌入到图像块序列中,用以丰富训练样本的多样性;(2)图像块序列融合重构模块。提取已经获得的图像块序列中不太重要的部分,并将它们与原始的图像块序列融合以重构原始图像块序列;(3)空间切割模块。从空间方向上对图像块序列进行切片和分组,并引入身份损失,可以有效提高图像块序列的短程相关性。对遮挡和整体重识别数据集的实验结果表明,所提网络的性能优于其他先进方法。

关键词：遮挡行人重识别局部特征图像块序列视觉转换器

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机器人自动上箱系统在卷烟装封箱机组的应用

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烟草科技 2013年第2期46卷 20-23页

作者：杨剑锋徐智勇赵云斌关宏红云红河烟草(集团)有限责任公司曲靖卷烟厂北京达特烟草成套设备技术开发有限责任公司

为解决卷烟生产过程中装封箱机组人工上箱方式工作效率低、差错率高以及与辅料物流系统自动化、信息化衔接不畅等问题,利用工业机器人和图像识别技术设计了自动上箱系统。该系统采用具有6关节的轻型工业机器人,满足纸箱抓取灵活性需求;... 详细信息

为解决卷烟生产过程中装封箱机组人工上箱方式工作效率低、差错率高以及与辅料物流系统自动化、信息化衔接不畅等问题,利用工业机器人和图像识别技术设计了自动上箱系统。该系统采用具有6关节的轻型工业机器人,满足纸箱抓取灵活性需求;选用带有多级真空发生器的大面积蜂巢式真空吸盘作为夹具,有效提高系统可靠性;图像识别系统通过工业智能相机采集与纸箱相关信息和数据并进行图像运算。应用效果表明,机器人自动上箱系统实现了对纸箱的自动解带、识别、上料、抓取以及送料工位与AGV(Automatic Guided Vehicle)系统的无缝对接。与传统输送方式相比,辅料AGV的复合循环作业比例增加了40%,减少了AGV数量;与传统的人工上箱方式对比,机器人上箱的准确率可达到99%,降低了人工劳动强度,提高了工作效率。

关键词：装封箱机组机器人上箱系统图像识别自动导引车系统

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