检索结果-内蒙古大学图书馆

Asymmetric Dual-Stream Networks for Lightweight RGB-D Salient Object Detection

Journal of Shanghai Jiaotong University (Science) 2025年 1-11页

作者： Wang, Yan Zheng, Wanlu Xia, Yaozheng Wang, Shaorong School of Information Science and Technology Beijing Forest University Beijing100083 China Engineering Research Center for Forestry-oriented Intelligent Information Processing of National Forestry and Grassland Administration Beijing100083 China Beijing Virtual Simulation and Visualization Engineering Center Beijing100871 China

Integrating image and depth information for RGB-D salient object detection has become a research hotspot in the field of saliency detection. Balancing the efficiency and performance of salient object detection models under resource constraints is a key challenge. To address this, this paper proposes an asymmetric lightweight network suitable for real-time RGB-D salient object detection tasks. The network reduces the number of network parameters by designing different lightweight feature extraction networks for different input modalities. Additionally, a multi-modal feature enhancement fusion module is designed to effectively fuse multi-modal features while compensating for the information loss caused by the lightweight backbone network. Moreover, this paper utilizes a global context module for dense decoding, aggregating local and global information of multi-scale features without significantly increasing computational complexity. The experimental results on five benchmarks show that the proposed lightweight RGB-D salient object detection network not only outperforms most mainstream models quantitatively and qualitatively, but also significantly outperforms other models in terms of efficiency, only with a parameter count of 5.1 million and a computational load of 0.77 gigaflops. This achievement validates the proposed method’s ability to achieve lightweight salient object detection while maintaining high efficiency. © Shanghai Jiao Tong University 2024.

关键词： Object recognition

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A review on image-based rendering

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virtual Reality & Intelligent Hardware 2019年第1期1卷 39-54页

作者： Yuan CHANG Guo-Ping WANG School of Electronics Engineering and Computer Science Peking UniversityBeijing 100871China Beijing Engineering Research Center for Virtual Simulation and Visualization Beijing 100871China

Image-based rendering is important both in the field of computer graphics and computer vision,and it is also widely used in virtual reality *** more than two decades,people have done a lot of work on the research of image-based rendering,and these methods can be divided into two categories according to whether the geometric information of the scene is *** to this classification,we introduce some classical methods and representative methods proposed in recent *** also compare and analyze the basic principles,advantages and disadvantages of different ***,some suggestions are given for research directions on image-based rendering techniques in the future.

关键词： Image-based rendering virtual reality Image interpolation Panorama

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Homography-guided stereo matching for wide-baseline image interpolation

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Computational Visual Media 2022年第1期8卷 119-133页

作者： Yuan Chang Congyi Zhang Yisong Chen Guoping Wang Peking University Beijing 100871China Beijiing Engineering Technology Research Center of Virtual Simulation and Visualization Peking UniversityBeijing 100871China The University of Hong Kong Hong KongChina

Image interpolation has a wide range of applications such as frame rate-up conversion and free viewpoint *** significant progresses,it remains an open challenge especially for image pairs with large *** this paper,we first propose a novel optimization algorithm for motion estimation,which combines the advantages of both global optimization and a local parametric transformation *** perform optimization over dynamic label sets,which are modified after each iteration using the prior of piecewise consistency to avoid local *** we apply it to an image interpolation framework including occlusion handling and intermediate image *** validate the performance of our algorithm experimentally,and show that our approach achieves state-of-the-art performance.

关键词： image interpolation view synthesis homo-graphy propagation belief propagation

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3-D contour-aware U-Net for efficient rectal tumor segmentation in magnetic resonance imaging

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Medical engineering and Physics 2025年 140卷 104352-104352页

作者： Lu, Yi Dang, Jun Chen, Junzhang Wang, Yuanyuan Zhang, Tao Bai, Xiangzhi Image Processing Center Beihang University Beijing102206 China National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital & Shenzhen Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Shenzhen518116 China Department of Oncology The First Affiliated Hospital of Chongqing Medical University Chongqing40016 China The State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing100191 China Beijing Advanced Innovation Center for Biomedical Engineering Beihang University Beijing100083 China Key Laboratory of Spacecraft Design Optimization and Dynamic Simulation Technology Ministry of Education Beihang University Beijing102206 China

Magnetic resonance imaging (MRI), as a non-invasive detection method, is crucial for the clinical diagnosis and treatment plan of rectal cancer. However, due to the low contrast of rectal tumor signal in MRI, segmentation is often inaccurate. In this paper, we propose a new three-dimensional rectal tumor segmentation method CAU-Net based on T2-weighted MRI images. The method adopts a convolutional neural network to extract multi-scale features from MRI images and uses a Contour-Aware decoder and attention fusion block (AFB) for contour enhancement. We also introduce adversarial constraint to improve augmentation performance. Furthermore, we construct a dataset of 108 MRI-T2 volumes for the segmentation of locally advanced rectal cancer. Finally, CAU-Net achieved a DSC of 0.7112 and an ASD of 2.4707, which outperforms other state-of-the-art methods. Various experiments on this dataset show that CAU-Net has high accuracy and efficiency in rectal tumor segmentation. In summary, proposed method has important clinical application value and can provide important support for medical image analysis and clinical treatment of rectal cancer. With further development and application, this method has the potential to improve the accuracy of rectal cancer diagnosis and treatment. © 2025 IPEM

关键词： Image segmentation

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Temporal continuity of visual attention for future gaze prediction in immersive virtual reality

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virtual Reality & Intelligent Hardware 2020年第2期2卷 142-152页

作者： Zhiming HU Sheng LI Meng GAI Department of Computer Science and Technology School of Electronic Engineering and Computer SciencePeking UniversityBeijing 100871China Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking UniversityBeijing 100871China

Background Eye tracking te chnology is receiving increased attention in the field of virtual ***,future gaze prediction is crucial in pre-computation for many applications such as gaze-contingent rendering,advertisement placement,and content-based *** explore future gaze prediction,it is necessary to analyze the temporal continuity of visual attention in immersive virtual *** In this paper,the concept of temporal continuity of visual attention is ***,an autocorrelation function method is proposed to evaluate the temporal ***,the temporal continuity is analyzed in both free-viewing and task-oriented *** Specifically,in free-viewing conditions,the analysis of a free-viewing gaze dataset indicates that the temporal continuity performs well only within a short time interval.A task-oriented game scene condition was created and conducted to collect users'gaze *** analysis of the collected gaze data finds the temporal continuity has a similar performance with that of the free-viewing *** continuity can be applied to future gaze prediction and if it is good,users'current gaze positions can be directly utilized to predict their gaze positions in the *** The current gaze's future prediction performances are further evaluated in both free-viewing and task-oriented conditions and discover that the current gaze can be efficiently applied to the task of short-term future gaze *** task of long-term gaze prediction still remains to be explored.

关键词： Temporal continuity Visual attention Autocorrelation analysis Gaze prediction virtual reality

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simulation of collective pursuit-evasion behavior with runtime situational awareness

Simulation of collective pursuit-evasion behavior with runti...

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作者： Yu, Zhenjing Tan, Junyin Li, Sheng School of Computer Science Peking University Beijing China Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Beijing China

We present a simulation method of pursuit-evasion behaviors between different herds with runtime situational awareness. We model the collective movement of predators and prey in the hunting process based on an improved Boid model and the finite state machine involving multiple perception factors about the situations. Taking wolves hunting caribous as an example, our method not only simulates the collective behavior, but also realizes individual intelligent behaviors consistent with the observations. We conducted intensive experiments, and the results show that our method can simulate more realistic pursuit-evasion behavior under different testing scenarios with a variety of parameters. Our method can be easily transferred to the theoretical study of collective behaviors of other herds. © 2022 John Wiley & Sons Ltd.

关键词： collective behavior perception pursuit-evasion situational awareness

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Simulating unmanned aerial vehicle flight control and collision detection

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Visual Computing for Industry,Biomedicine,and Art 2019年第1期2卷 38-44页

作者： Mengtian Liu Meng Gai Shunnan Lai Peking University Shenzhen Graduate School Shenzhen 518055China School of EECS Peking UniversityBeijing 100871China Beijing Engineering Technology Research Center of Virtual Simulation and Visualization(Peking University) Beijing 100871China

An unmanned aerial vehicle(UAV)is a small,fast aircraft with many useful *** is widely used in military reconnaissance,aerial photography,searches,and other fields;it also has very good practical-application and development *** the UAV’s flight orientation is easily changeable,its orientation and flight path are difficult to control,leading to its high damage ***,UAV flight-control technology has become the focus of *** study focuses on simulating a UAV’s flight and orientation control,and detecting collisions between a UAV and objects in a complex virtual *** proportional-integral-derivative control algorithm is used to control the orientation and position of the UAV in a virtual environment.A version of the bounding-box method that combines a grid with a k-dimensional tree is adopted in this paper,to improve the system performance and accelerate the collision-detection *** provides a practical method for future studies on UAV flight position and orientation control,collision detection,etc.

关键词： Unmanned aerial vehicle Proportional-integral-derivative control algorithm Orientation control Position control Grid k-dimensional tree Collision detection

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A homogenization method for nonlinear inhomogeneous elastic materials

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virtual Reality & Intelligent Hardware 2021年第2期3卷 156-170页

作者： Jing ZHAO Fei ZHU Liyou XU Yong TANG Sheng LI College of Information Science and Engineering Yanshan UniversityQinhuangdaoHebei 066004China The Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province QinhuangdaoHebei 066004China School of Electronics Engineering and Computer Science Peking UniversityBeijing 100871China Beijing Engineering Research Center for Virtual Simulation and Visualization Beijing 100871China

Background Fast simulation techniques are strongly favored in computer graphics,especially for the nonlinear inhomogeneous elastic *** homogenization theory is a perfect match to simulate inhomogeneous deformable objects with its coarse discretization,as it reveals how to extract information at a fine scale and to perform efficient computation with much less *** existing homogenization method is not applicable for ubiquitous nonlinear materials with the limited input deformation *** In this paper,we have proposed a homogenization method for the efficient simulation of nonlinear inhomogeneous elastic *** approach allows for a faithful approximation of fine,heterogeneous nonlinear materials with very coarse *** analysis provides the basis of a linear deformation space and modal derivatives extend the space to a nonlinear regime;based on this,we exploited modal derivatives as the input characteristic deformations for *** also present a simple elastic material model that is nonlinear and anisotropic to represent the homogenized *** nonlinearity of material deformations can be represented properly with this *** material properties for the coarsened model were solved via a constrained optimization that minimizes the weighted sum of the strain energy deviations for all input deformation *** arbitrary number of bases can be used as inputs for homogenization,and greater weights are placed on the more important low-frequency *** Based on the experimental results,this study illustrates that the homogenized material properties obtained from our method approximate the original nonlinear material behavior much better than the existing homogenization method with linear displacements,and saves orders of magnitude of computational *** The proposed homogenization method for nonlinear inhomogeneous elastic materials is capable of capturing the nonlinear dynamics of the

关键词： Physical-based simulation Homogenization theory Heterogeneous material Modal basis

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Interaction+: Interaction enhancement for web-based visualizations 10

Interaction+: Interaction enhancement for web-based visualiz...

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10th IEEE Pacific visualization Symposium, PacificVis 2017

作者： Lu, Min Liang, Jie Zhang, Yu Li, Guozheng Chen, Siming Li, Zongru Yuan, Xiaoru Peking University China School of Engineer and Information Technology University of Technology Sydney Australia Beijing Engineering Research Center of Virtual Simulation and Visualization China

ISBN: (纸本)9781509057382

In this work, we present Interaction+, a tool that enhances the interactive capability of existing web-based visualizations. Different from the toolkits for authoring interactions during the visualization construction, Interaction+ takes existing visualizations as input, analyzes the visual objects, and provides users with a suite of interactions to facilitate the visual exploration, including selection, aggregation, arrangement, comparison, filtering, and annotation. Without accessing the underlying data or process how the visualization is constructed, Interaction+ is application-independent and can be employed in various visualizations on the web. We demonstrate its usage in two scenarios and evaluate its effectiveness with a qualitative user study. © 2017 IEEE.

关键词： visualization

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A bottom-up scheme for user-defined feature comparison in ensemble data 15

A bottom-up scheme for user-defined feature comparison in en...

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SIGGRAPH Asia, SA 2015

作者： Liu, Richen Guo, Hanqi Yuan, Xiaoru School of EECS Peking University China Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University China Argonne National Laboratory United States

ISBN: (纸本)9781450339292

Most of the existing approaches to visualizing the vector field ensembles are achieved by visualizing the uncertainty of individual variables of different simulation runs, for example, geometry distance, statistics, variability etc. However, the comparison of the derived feature or user-defined feature (e.g. vortex) is also of vital significance since they often make more sense according to the domain knowledge. In this paper, we present a new framework to extract user-defined feature from different simulation runs. Specially, we use a bottom-up searching scheme to help extract vortex with a user-defined shape. We further compute the geometry information including the size, and the geo-spatial location of the extracted vortex, and design some link views to compare them between different runs. Results show that our method is capable of extracting user-defined feature across different runs and comparing them spatially and temporally.

关键词： visualization

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