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Endowing rotation invariance for 3D finger shape and vein verification

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Frontiers of Computer Science 2022年第5期16卷 115-130页

作者： Hongbin XU Weili YANG qiuxia wu Wenxiong KANG School of Software Engineering South China University of TechnologyGuangzhou 510006China School of Automation Science and Engineering South China University of TechnologyGuangzhou 510641China

Finger vein biometrics have been extensively studied for the capability to detect aliveness,and the high security as intrinsic ***,vein pattern distortion caused by finger rotation degrades the performance of CNN in 2D finger vein recognition,especially in a contactless *** address the finger posture variation problem,we propose a 3D finger vein verification system extracting axial rotation invariant *** efficient 3D finger vein reconstruction optimization model is proposed and several accelerating strategies are adopted to achieve real-time 3D reconstruction on an embedded *** main contribution in this paper is that we are the first to propose a novel 3D point-cloud-based endto-end neural network to extract deep axial rotation invariant feature,namely *** the network,the rotation problem is transformed to a permutation problem with the help of specially designed rotation ***,to validate the performance of the proposed network more rigorously and enrich the database resources for the finger vein recognition community,we built the largest publicly available 3D finger vein dataset with different degrees of finger rotation,namely the Large-scale Finger Multi-Biometric Database-3D Pose Varied Finger Vein(SCUT LFMB-3DPVFV)*** results on 3D finger vein datasets show that our 3DFVSNet holds strong robustness against axial rotation compared to other approaches.

关键词： 3D finger-vein biometrics point-cloud CNN

Accelerating the thermal fading rate of photochromic naphthopyrans by pillar[5]arene-based conjugated macrocycle polymer

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Chinese Chemical Letters 2022年第1期33卷 239-242页

作者： Shuangyan Liu Taishan Yan qiuxia wu Zheng Xu Jie Han Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Energy) College of ChemistryNankai UniversityTianjin 300071China State Key Laboratory of Elemento-Organic Chemistry College of ChemistryNankai UniversityTianjin 300071China

A new micro-spherical conjugated macrocycle polymer(P[5]-TFB-CMP)was prepared by the condensation reaction between dihydrazide functionalized pillar[5]arene and 1,3,5-triformylbenzene under ambient conditions.P[5]-TFB-CMP exhibits large surface area with excellent thermal stability and has been used as additive to prepare composite PMMA film of photochromic *** results showed that the addition of P[5]-TFB-CMP could dramatically accelerate the thermal fading rate of the photochromic composite film by up to 12 *** is a new strategy to overcome the drawback of the matrix effect.

关键词： Pillararene Conjugated macrocycle polymer Naphothopyran Photochromism Thermal fading rate Matrix effect

Cable Routing Based on V-Grids and Modified ant colony Algorithm

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Cable Routing Based on V-Grids and Modified ant colony Algor...

Enhancement of Innovation Competence of College Students Majoring in Mathematics Education through Curriculum Optimization

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作者： Liu Weidong wu qiuxia Guo Jinhui College of Automation Science and Engineering South China University of Technology

Cable routing is one of the important steps for product assembly. Based on the visual grid（v-grid） representation of the routing environment, a modified ant colony algorithm is discussed for the auto cable routing problem. The multi-valued grid is adopted, and the visual bound-grid of the obstacle corner is calculated;the next routing grid expansion set is discussed based on the multi-valued grid and the visual bound-grid. Considering the historic optimal distance between the current routing grid and the terminate grid, the grid pheromone and heuristic is calculated;the next routing grid is determined referring to both the random and roulette methods. The cable routing utilizes the structure point data, and it’s used to describe the routing grid. During the routing process, a structure-grid data pool is designed to continuously enrich the v-grids and visual boundary information. Finally, the simulation results of the modified ant colony algorithm for different grid density environment and specific routing environment are illustrated, and it shows that the modified ant colony algorithm has a comparative advantage compared with the basic ant colony algorithm in terms of cable routing speed and routing environment adaptability.

关键词： cable routing ant colony algorithm visual grid path planning

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Journal of Contemporary Educational Research 2024年第10期8卷 83-89页

作者： Chengqiang Wang qiuxia wu Xiangqing Zhao Zhiwei Lv School of Mathematics and Physics Suqian UniversitySuqian 223800Jiangsu ProvinceChina

The innovation competence of K-12 education teachers undoubtedly plays a crucial role in fostering the innovation abilities of their students.K-12 mathematics education equips students with the critical thinking and problem-solving skills essential for their future studies in colleges and universities,helping them grasp complex techniques to address challenges in everyday life and their ***,it is of great significance to study strategies for improving the innovation competence of college students majoring in Mathematics Education,as they will likely become K-12 education mathematics teachers directly after graduating from colleges or *** this paper,we study strategies for enhancing the innovation competence of college students majoring in Mathematics Education through curriculum *** analyze and explain in detail the importance of innovation competence for college students majoring in Mathematics Education and the difficulties encountered in enhancing college students’innovation *** the help of the analysis of the importance and challenges of enhancing college students’innovation competence,we propose several strategies to improve the innovation competence of college students majoring in Mathematics Education based on curriculum *** findings presented in this paper can be applied to develop strategies for college students majoring in Physics and Chemistry Education.

关键词： K-12 education Innovation competence College students Mathematics Education Curriculum optimization

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基于点云俯视图重映射的3D目标检测

华南理工大学学报（自然科学版） 2021年第1期49卷 39-46页

作者：吴秋霞黎玲敏华南理工大学软件学院广东广州510006

三维(3D)目标检测常见的数据格式为图像和点云,图像数据具有较好的目标识别能力,点云数据具有准确的空间信息。为了更好地利用图像数据目标识别能力较强和点云数据空间信息较准确的优点,文中提出了基于点云俯视图重映射的3D目标检测方法... 详细信息

三维(3D)目标检测常见的数据格式为图像和点云,图像数据具有较好的目标识别能力,点云数据具有准确的空间信息。为了更好地利用图像数据目标识别能力较强和点云数据空间信息较准确的优点,文中提出了基于点云俯视图重映射的3D目标检测方法Bird-PointNet。该方法首先将点云编码为俯视图格式,进行目标识别和粗略定位;然后将俯视图检测结果映射回点云空间,进行精确检测。在KITTI数据集上的俯视图检测和3D检测实验结果表明:与仅使用点云俯视图编码的基准方法相比,Bird-PointNet方法的3D检测准确率更高。

关键词：目标检测自动驾驶点云俯视图

Analysis of the Role of General Practitioners Services in Rural Areas during the COVID-19 Epidemic

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Journal of Advances in Medicine Science 2021年第2期4卷 35-41页

作者： Zuohua Liu Feiya Li Zihan Liu qiuxia wu Xiangyu Li Qiang Wang North Sichuan Medical College Sichuan637000China

Since the outbreak of the COVID-19,various regions of China have been rapidly deployed under the leadership of the Central Committee of the Party to actively prevent and control the *** rural areas of my country have weak links to the prevention and management of public health *** include lack of medical and health resources and farmers’low awareness of epidemic *** that correspond to the prevention and management of the COVID-19 are more *** the patient’s first contact and“gatekeeper”in the fight against the epidemic,the general practitioner is responsible for the“first visit-subsequent ongoing intervention”.This article is about the prevention and control of the COVID-19 epidemics and epidemic prevention in terms of dissemination of knowledge,informed crowd control,joint prevention and control,and standardized management of *** is a summary of the efforts of general *** at home,interactive referrals to medical consortiums,special care for contracted *** function during the management period aims to analyze the role played by general practitioners during the epidemic and to provide new ideas for the prevention and management of the *** more targeted general practitioner-style services in rural areas to promote the implementation and improvement of health and poverty *** health level of the rural population provides a theoretical standard.

关键词： General practitioner SARS-CoV-2 COVID-19 Epidemic prevention and management

陆地生态系统土壤铁结合态有机碳:含量、分布与调控

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科学通报 2023年第6期68卷 695-704页

作者：杨颖吴福忠吴秋霞朱晶晶倪祥银福建师范大学地理科学学院福州350117 湿润亚热带生态-地理过程教育部重点实验室福州350117 福建三明森林生态系统国家野外科学观测研究站三明365002

土壤是陆地生态系统最大的有机碳库,其有机碳储量超过植被和大气碳库的总和.铁氧化物的矿物保护被认为是土壤有机碳长期稳定性的关键机制之一.铁氧化物具有比表面积大、吸附能力强的特点,且在热带和亚热带地区含量丰富.然而,目前关于陆... 详细信息

土壤是陆地生态系统最大的有机碳库,其有机碳储量超过植被和大气碳库的总和.铁氧化物的矿物保护被认为是土壤有机碳长期稳定性的关键机制之一.铁氧化物具有比表面积大、吸附能力强的特点,且在热带和亚热带地区含量丰富.然而,目前关于陆地生态系统土壤铁结合态有机碳占土壤总有机碳的比例(f_(Fe-OC))及其分布格局和调控机制仍不明晰.本文整理了已报道的陆地生态系统351组土壤f_(Fe-OC)数据,分析了其在不同土层、生态系统、气候带的分布格局和受气候、土壤、矿物因子的调控机制.结果表明:(1)陆地生态系统土壤f_(Fe-OC)平均为21.9%,且深层土f_(Fe-OC)(37.5%)显著高于表层土(15.4%,P草地(16.2%)>森林(14.9%)>农田(14.8%),贫氧生态系统(24.2%)显著高于有氧生态系统(15.7%,P寒带(21.9%)>温带(20.2%)>高原带(16.6%)的规律.(3)陆地生态系统土壤f_(Fe-OC)主要受土壤深度的影响,且不同土层的调控机制不同:表层土f_(Fe-OC)主要受无定形态铁和有机络合态铁含量的影响,而深层土f_(Fe-OC)主要受土壤pH和土壤质地(黏粒、粉粒和砂粒含量)的影响.本研究结果为进一步认识陆地生态系统黏土矿物对土壤有机碳的保护机制提供了理论依据.

关键词：铁氧化物土壤有机碳铁结合态有机碳矿物保护

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旋转不变的2D视图-3D点云自编码器

光学精密工程 2023年第5期31卷 656-666页

作者：刘贤颖吴秋遐康文雄李玉琼华南理工大学、软件学院广东广州510006 华南理工大学、自动化科学与工程学院广东广州510641 中国科学院、力学研究所北京100190

点云的无监督表征学习对于理解和分析点云至关重要,基于三维重建的自动编码器是无监督学习中的重要架构。针对现有的自编码器存在旋转干扰和特征学习能力不足的问题,本文提出一个旋转不变的2D视图-3D点云自编码器。首先,设计局部融合全... 详细信息

点云的无监督表征学习对于理解和分析点云至关重要,基于三维重建的自动编码器是无监督学习中的重要架构。针对现有的自编码器存在旋转干扰和特征学习能力不足的问题,本文提出一个旋转不变的2D视图-3D点云自编码器。首先,设计局部融合全局的旋转不变特征转换策略。对于局部表示,利用手工设计特征对输入点云进行转换,生成旋转不变的点云表征;对于全局表示,提出一个基于主成分分析(Principal Component Analysis,PCA)的对齐模块,将旋转点云对齐同一姿态下,在补充全局信息的同时排除旋转干扰。然后,在编码器设计局部和非局部特征提取模块,充分提取点云的局部空间特征和非局部上下文相关性,并建模不同层次特征之间的语义一致性。最后,提出一个基于PCA对齐的2D-3D重构的解码方法,重建对齐后的三维点云和二维视图,使编码器输出的点云表征集成来自3D点云和2D视图的丰富学习信号。实验结果表明:本算法在随机旋转的合成数据集ModelNet40和真实数据集ScanObjectNN上的识别精度分别为90.84%和89.02%,学习的点云表征在没有任何标签监督的情况下实现了良好的可辨别性,并且具有较好的旋转鲁棒性。

关键词：三维点云自编码器表征学习旋转不变性

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三维补全关键技术研究综述

光学精密工程 2023年第5期31卷 667-696页

作者：肖海鸿吴秋遐李玉琼康文雄华南理工大学、自动化科学与工程学院广东广州510640 华南理工大学、软件学院广东广州510006 中国科学院、力学研究所、国家微重力实验室北京100190

从部分观测信息中推断出完整三维形状与语义场景信息对自动驾驶、机器人视觉、元宇宙生态体系构建等而言是至关重要的,因此,主要围绕三维形状补全、三维场景补全和三维语义场景补全任务而展开的三维补全技术被广泛研究。本文围绕上述三... 详细信息

从部分观测信息中推断出完整三维形状与语义场景信息对自动驾驶、机器人视觉、元宇宙生态体系构建等而言是至关重要的,因此,主要围绕三维形状补全、三维场景补全和三维语义场景补全任务而展开的三维补全技术被广泛研究。本文围绕上述三维补全任务,对近年来的相关研究工作进行了系统性的分析和总结。首先,针对三维形状补全任务,对基于传统方法的形状补全和基于深度学习的形状补全这两个方面的研究进展进行了综述。其次,针对三维场景补全任务,对基于模型拟合的场景补全和基于生成式的场景补全方法这两个方面的研究进展进行了综述。再次,针对三维语义场景补全任务,深入分析了场景补全和语义分割两大任务之间的耦合特性,并根据输入数据的不同类型,对基于深度图的语义场景补全方法、基于深度图联合彩色图像的语义场景补全方法、以及基于点云的语义场景补全方法这三个方面的研究进展进行了综述。最后,对三维补全任务目前面临的主要问题及未来发展趋势进行了分析和展望,旨在为三维视觉中这一新兴领域的相关研究者提供一些有益的参考。

关键词：形状补全场景补全语义场景补全三维视觉