检索结果-内蒙古大学图书馆

7th International Conference on Automation, Control and Robots, ICACR 2023

作者： Shaker, Walid K. Klimchik, Alexandr Innopolis University Institute of Robotics and Computer Vision Innopolis Russia Lincoln United Kingdom

ISBN: (纸本)9798350302882

This paper addresses the challenge of the poor accuracy and the toolpath deviation in Incremental Sheet Forming (ISF) caused by the forming forces applied to the workpiece. The paper proposes an offline toolpath error compensation approach based on stiffness analysis. A truncated cone was used as a test case and the numerical simulation of the ISF process was conducted on Abaqus CAE software to extract forming forces corresponding to toolpath points. The compensation algorithm is based on the Virtual Joint Method (VJM) and is implemented on a FANUC R-2000iC/165F robot using RoboDK API for MATLAB. The results show that the deviation of the robot tool due to the forming forces may reach up to 20 mm which can be handled by the compensated toolpath. Finally, the study proposes an overall process for the stiffness-based correction algorithm. © 2023 IEEE.

关键词： Stiffness

来源：评论

学校读者我要写书评

暂无评论

Comparative Analysis of Springback Compensation for Various Profiles in Incremental Forming

Comparative Analysis of Springback Compensation for Various ...

引用

2023 International Russian Automation Conference, RusAutoCon 2023

作者： Shaker, Walid K. Klimchik, Alexandr Institute of Robotics and Computer Vision Innopolis University Innopolis Russia Lincoln United Kingdom

ISBN: (纸本)9798350345551

Incremental forming encounters a common challenge known as the springback effect, wherein the workpiece undergoes elastic deformation and deviates slightly from the desired shape once the forming tool is released. This discrepancy between the intended and obtained shape results in reduced geometric accuracy, making incremental forming less precise compared to conventional methods. This research presents a novel springback effect compensation model for sheet forming processes. The main objective is to evaluate the model's performance across various profiles, with a focus on enhancing precision and accuracy in the formed shapes. The proposed model demonstrates an impressive ability to compensate for approximately 60% of the springback effect, offering a practical solution for offline springback compensation. © 2023 IEEE.

关键词： single-point incremental forming SPIF numerical simulation SPIF trajectories springback compensation

来源：评论

学校读者我要写书评

暂无评论

Balanced optical flow refinement by bidirectional constraint

Balanced optical flow refinement by bidirectional constraint

引用

作者： Choi, Jongwon Kim, Hyeongwoo Oh, Tae-Hyun Kweon, In So Robotics and Computer Vision Laboratory Korea Advanced Institute of Science and Technology Korea Republic of

ISBN: (纸本)9781479957514

We present an efficient optical flow refinement approach based on a bidirectional flow consistency. Our method is an add-on component that improves the existing optical flow estimation to be balanced between forward and backward flows. Most of the state-of-the-art optical flow methods only consider unidirectional motion vectors from a source image to a target image, which can make the estimated flow inconsistent with its backward estimation. The inconsistency can be reduced by considering the bidirectional motion when the optical flow is estimated, but it would be very hard for most of the typical optical flow methods and impossible for some of them. To solve this problem, we propose a sampling-based optimization method for efficiently refining the optical flows with a bidirectional constraint. By evaluating on Middle-bury benchmark and public large displacement datasets, we validate the effectiveness of our method quantitatively and qualitatively and for accuracy. © 2014 IEEE.

关键词： Optical flows

来源：评论

学校读者我要写书评

暂无评论

Support vector machine with discriminative low-rank embedding

引用

CAAI Transactions on Intelligence Technology 2024年第5期9卷 1249-1262页

作者： Guangfei Liang Zhihui Lai Heng Kong Computer Vision Institute College of Computer Science and Software EngineeringShenzhen UniversityShenzhenChina Shenzhen Institute of Artificial Intelligence and Robotics for Society ShenzhenChina Department of Breast and Thyroid Surgery BaoAn Central Hospital of ShenzhenShenzhenChina

Support vector machine(SVM)is a binary classifier widely used in machine ***,neglecting the latent data structure in previous SVM can limit the performance of SVM and its *** address this issue,the authors propose a novel SVM with discriminative low-rank embedding(LRSVM)that finds a discriminative latent low-rank subspace more suitable for SVM *** extension models of LRSVM are introduced by imposing different orthogonality constraints to prevent computational inaccuracies.A detailed derivation of the authors’iterative algorithms are given that is essentially for solving the SVM on the low-rank ***,some theorems and properties of the proposed models are presented by the *** is worth mentioning that the subproblems of the proposed algorithms are equivalent to the standard or the weighted linear discriminant analysis(LDA)*** indicates that the projection subspaces obtained by the authors’algorithms are more suitable for SVM classification compared to those from the LDA *** convergence analysis for the authors proposed algorithms are also ***,the authors conduct experiments on various machine learning data sets to evaluate the *** experiment results show that the authors’algorithms perform significantly better than other algorithms,which indicates their superior abilities on classification tasks.

关键词： iterative methods machine leaning support vector machunes

来源：评论

学校读者我要写书评

暂无评论

Multiscale Convolutional Transformer with Diverse-aware Feature Learning for Motor Imagery EEG Decoding

引用

IEEE Transactions on Cognitive and Developmental Systems 2025年

作者： Hang, Wenlong Wang, Junliang Liang, Shuang Lei, Baiying Wang, Qiong Li, Guanglin Chen, Badong Qin, Jing Nanjing Tech University College of Computer Nanjing211816 China Nanjing Tech University Information Engineering Nanjing211816 China Nanjing University of Posts and Telecommunications School of Internet of Things Nanjing210023 China Shenzhen University School of Biomedical Engineering Shenzhen518060 China Guangdong Provincial Key Laboratory of Computer Vision Shenzhen518055 China Virtual Reality Technology Shenzhen518055 China Guangdong-Hong Kong-Macao Joint Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen518055 China Shenzhen Institute of Advanced Technology Shenzhen518055 China Chinese Academy of Sciences Shenzhen518055 China Xi'an Jiaotong University Institute of Artificial Intelligence and Robotics Xi'an710049 China Hong Kong Polytechnic University School of Nursing Hung Hom Hong Kong

Electroencephalogram (EEG)-based motor imagery (MI) brain-computer interfaces (BCIs) have significant potential in improving motor function for neurorehabilitation. Despite recent advancements, learning diversified EEG features across different frequency ranges remains a significant challenge, as the homogenization of feature representations often limits the generalization capabilities of EEG decoding models for BCIs. In this paper, we propose a novel multiscale convolutional transformer framework for EEG decoding that integrates multiscale convolution, transformer, and diverse-aware feature learning scheme (MCTD) to tackle the above challenge. Specifically, we first capture multiple frequency features using dynamic one-dimensional temporal convolution with different kernel lengths. Subsequently, we incorporate convolutional layers and transformers with a contrastive learning scheme to extract discriminative local and global EEG features within a single frequency range. To mitigate the homogenization of features extracted from different frequency ranges, we propose a novel decorrelation regularization. It enables multiscale convolutional transformers produce less correlated features with each other, thereby enhancing the overall expressiveness of EEG decoding model. The performance of MCTD is evaluated on four public MI-based EEG datasets, including the BCI competition III 3a and IV 2a, the BNCI 2015- 001, and the OpenBMI. For the average Kappa/Accuracy scores, MCTD obtains improvements of 3.58%/2.68%, 3.09%/2.20%, 2.33%/1.54%, and 4.44%/2.22%, over the state-of-the-art method on four EEG datasets, respectively. Experimental results demonstrate that our method exhibits superior performance. © 2016 IEEE.

关键词： Brain computer interface

来源：评论

学校读者我要写书评

暂无评论

Generative 3D hand tracking with spatially constrained pose sampling 28

Generative 3D hand tracking with spatially constrained pose ...

引用

28th British Machine vision Conference, BMVC 2017

作者： Roditakis, Konstantinos Makris, Alexandros Argyros, Antonis A. Computational Vision and Robotics Laboratory Institute of Computer Science FORTH Greece Computer Science Department University of Crete Greece

ISBN: (纸本)190172560X

We present a method for 3D hand tracking that exploits spatial constraints in the form of end effector (fingertip) locations. The method follows a generative, hypothesize-and-test approach and uses a hierarchical particle filter to track the hand. In contrast to state of the art methods that consider spatial constraints in a soft manner, the proposed approach enforces constraints during the hand pose hypothesis generation phase by sampling in the Reachable Distance Space (RDS). This sampling produces hypotheses that respect both the hands’ dynamics and the end effector locations. The data likelihood term is calculated by measuring the discrepancy between the rendered 3D model and the available observations. Experimental results on challenging, ground truth-annotated sequences containing severe hand occlusions demonstrate that the proposed approach outperforms the state of the art in hand tracking accuracy. © 2017. The copyright of this document resides with its authors.

关键词： End effectors

来源：评论

学校读者我要写书评

暂无评论

Unsupervised and explainable assessment of video similarity 30

Unsupervised and explainable assessment of video similarity

引用

30th British Machine vision Conference, BMVC 2019

作者： Papoutsakis, Konstantinos Argyros, Antonis Computer Science Department University of Crete Greece Computational Vision and Robotics Lab Institute of Computer Science FORTH Greece

We propose a novel unsupervised method that assesses the similarity of two videos on the basis of the estimated relatedness of the objects and their behavior, and provides arguments supporting this assessment. A video is represented as a complete undirected action graph that encapsulates information on the types of objects and the way they (inter)act. The similarity of a pair of videos is estimated based on the bipartite Graph Edit Distance (GED) of the corresponding action graphs. As a consequence, on-top of estimating a quantitative measure of video similarity, our method establishes spatiotemporal correspondences between objects across videos if these objects are semantically related, if/when they interact similarly, or both. We consider this an important step towards explainable assessment of video and action similarity. The proposed method is evaluated on a publicly available dataset on the tasks of activity classification and ranking and is shown to compare favorably to state of the art supervised learning methods. © 2019. The copyright of this document resides with its authors.

关键词： computer vision

来源：评论

学校读者我要写书评

暂无评论

Dynamic Object Grasping in Human-Robot Cooperation Based on Mixed-Reality

Dynamic Object Grasping in Human-Robot Cooperation Based on ...

引用

2021 International Conference "Nonlinearity, Information and robotics", NIR 2021

作者： Demian, Albert Ostanin, Mikhail Klimchik, Alexandr Innopolis University Center for Technologies in Robotics and Mechatronics Components Innopolis Russia Innopolis University Robotics and Computer Vision Institute Innopolis Russia

ISBN: (纸本)9781665424066

Static Object grasping is a challenging task that has been studied for decades. The difficulty of the task comes back to the reason that a grasping attempt can have many solutions or due to the uncertainty about the targeted object's features and characteristics. This makes the fact about dynamic object grasping with un-modeled dynamics even more challenging. In this paper, an approach for dynamic object grasping is presented. The approach considers human-robot handover operation where the robot should be able to track human's holding-object hand and plan a successful grasp of the object in hand. The system was implemented with the help of Mixed-Reality using HoloLens glasses for human's hand tracking. A serial manipulator was used to execute the operation mounted with end-effector-mounted camera to perform computer vision operations for grasp planning and correction. The main task is robot at random configuration can be able to find hand-holding object and plan grasp on object in hand. The implemented system shows success and was able to perform most of the grasping tasks successfully. © 2021 IEEE.

关键词： Mixed reality

来源：评论

学校读者我要写书评

暂无评论

Explicit Model Predictive Control Design based on Constrained Zonotope Propagation 7

Explicit Model Predictive Control Design based on Constraine...

引用

7th Scientific School: Dynamics of Complex Networks and their Applications, DCNA 2023

作者： Jnadi, Ali Khusainov, Ramil Nedelchev, Simeon Savin, Sergei Innopolis University Institute of Robotics and Computer Vision Innopolis Russia Innopolis University Center for Technologies in Robotics and Mechatronics Components Innopolis Russia

ISBN: (纸本)9798350305746

Zonotopes have become a widely used tool in control design, demonstrating their effectiveness in various applications ranging from state estimation to explicit model predictive control. However, the traditional use of zonotopes is limited by a set certain geometric shapes that restrict the range of state sets that can be considered. This paper proposes a novel approach to control design using constrained zonotopes that can encode arbitrary polytopes. We present a propagation scheme and an affine approximation of the exact control law for this representation, and discuss issues related to center identification for constrained zonotopes. A fast method for detecting set membership is also proposed based on lifting the constrained zonotopes into a higher dimensional space. The proposed method extends the range of shapes that can be considered in control design and offers a promising alternative to the limitations of regular zonotopes. It has the potential for wide-ranging impact in various areas of control, providing a valuable tool for solving complex control problems. © 2023 IEEE.

关键词： Convex optimization

来源：评论

学校读者我要写书评

暂无评论

Activity recognition in wide aerial video surveillance using entity relationship models 12

Activity recognition in wide aerial video surveillance using...

引用

20th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems, ACM SIGSPATIAL GIS 2012

作者： Choi, Jongmoo Dumortier, Yann Prokaj, Jan Medioni, Gérard Computer Vision Lab. Institute for Robotics and Intelligent Systems University of Southern California United States

ISBN: (纸本)9781450316910

We present the design and implementation of an activity recognition system in wide area aerial video surveillance using Entity Relationship Models (ERM). In this approach, finding an activity is equivalent to sending a query to a Relational DataBase Management System (RDBMS). By incorporating reference imagery and Geographic Information System (GIS) data, tracked objects can be associated with physical meanings, and several high levels of reasoning, such as traffic patterns or abnormal activity detection, can be performed. We demonstrate that different types of activities, with hierarchical structure, multiple actors, and context information, are effectively and efficiently defined and inferred using the ERM framework. We also show how visual tracks can be better interpreted as activities by using geo information. Experimental results on both real visual tracks and GPS traces validate our approach. © 2012 Authors.

关键词： Security systems

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：