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arXiv 2024年

作者： Tang, Xiangjun Wu, Linjun Wang, He Wu, Yiqian Hu, Bo Li, Songnan Gong, Xu Liao, Yuchen Kou, Qilong Jin, Xiaogang State Key Lab of CAD&CG Zhejiang University China Department of Computer Science UCL Centre for Artificial Intelligence University College London United Kingdom Tencent Technology Co. Ltd. China State Key Lab of CAD&CG Zhejiang University ZJU-Tencent Game and Intelligent Graphics Innovation Technology Joint Lab China

Motion style transfer changes the style of a motion while retaining its content and is useful in computer animations and games. Contact is an essential component of motion style transfer that should be controlled explicitly in order to express the style vividly while enhancing motion naturalness and quality. However, it is unknown how to decouple and control contact to achieve fine-grained control in motion style transfer. In this paper, we present a novel style transfer method for fine-grained control over contacts while achieving both motion naturalness and spatial-temporal variations of style. Based on our empirical evidence, we propose controlling contact indirectly through the hip velocity, which can be further decomposed into the trajectory and contact timing, respectively. To this end, we propose a new model that explicitly models the correlations between motions and trajectory/contact timing/style, allowing us to decouple and control each separately. Our approach is built around a motion manifold, where hip controls can be easily integrated into a Transformer-based decoder. It is versatile in that it can generate motions directly as well as be used as post-processing for existing methods to improve quality and contact controllability. In addition, we propose a new metric that measures a correlation pattern of motions based on our empirical evidence, aligning well with human perception in terms of motion naturalness. Based on extensive evaluation, our method outperforms existing methods in terms of style expressivity and motion quality. Copyright © 2024, The Authors. All rights reserved.

关键词： computer games

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RoMo: A Robust Solver for Full-body Unlabeled Optical Motion Capture

arXiv

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arXiv 2024年

作者： Pan, Xiaoyu Zheng, Bowen Jiang, Xinwei Zeng, Zijiao Kou, Qilong Wang, He Jin, Xiaogang State Key Lab of CAD & CG Zhejiang University China ZJU-Tencent Game and Intelligent Graphics Innovation Technology Joint Lab China Tencent Games Digital Content Technology Center China Co. LTD China Department of Computer Science UCL Centre for Artificial Intelligence University College London United Kingdom

Optical motion capture (MoCap) is the "gold standard" for accurately capturing full-body motions. To make use of raw MoCap point data, the system labels the points with corresponding body part locations and solves the fullbody motions. However, MoCap data often contains mislabeling, occlusion and positional errors, requiring extensive manual correction. To alleviate this burden, we introduce RoMo, a learning-based framework for robustly labeling and solving raw optical motion capture data. In the labeling stage, RoMo employs a divide-and-conquer strategy to break down the complex full-body labeling challenge into manageable subtasks: alignment, full-body segmentation and part-specific labeling. To utilize the temporal continuity of markers, RoMo generates marker tracklets using a K-partite graph-based clustering algorithm, where markers serve as nodes, and edges are formed based on positional and feature similarities. For motion solving, to prevent error accumulation along the kinematic chain, we introduce a hybrid inverse kinematic solver that utilizes joint positions as intermediate representations and adjusts the template skeleton to match estimated joint positions. We demonstrate that RoMo achieves high labeling and solving accuracy across multiple metrics and various datasets. Extensive comparisons show that our method outperforms state-of-the-art research methods. On a real dataset, RoMo improves the F1 score of hand labeling from 0.94 to 0.98, and reduces joint position error of body motion solving by 25%. Furthermore, RoMo can be applied in scenarios where commercial systems are inadequate. The code and data for RoMo are available at https:// ***/non-void/RoMo. Copyright © 2024, The Authors. All rights reserved.

关键词： Motion capture

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Nuwa: An Authoring Tool for Graph Visualizations

Nuwa: An Authoring Tool for Graph Visualizations

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Pacific (formerly Asia-Pacific APVIS) Visualization Symposium

作者： Dongming Han Haiyang Zhu Wei Chen Jiacheng Pan Ran Chen Xumeng Wang Zhen Wen Luoxuan Weng Minfeng Zhu Yingcai Wu Rüdiger Westermann State Key Lab of CAD&CG Zhejiang University China Hithink RoyalFlush Information Network Co. Ltd. China Wuchan Zhongda Digital Technology Co. Ltd. China Laboratory of Art and Archaeology Image (Zhejiang University) Ministry of Education China College of Computer Science Nankai University China Zhejiang University China Computer Graphics and Visualization Technical University of Munich Germany

ISBN: (数字)9798350393804

ISBN: (纸本)9798350393811

Authoring graph visualization requires advanced programming skills, expert domain knowledge, and significant workload. Existing authoring tools either support limited templates of graph visualization, or suffer from a high learning cost. We analyze the design requirements on a tool for graph visualizations, and contribute Nuwa, a user-friendly declarative authoring tool for the interactive specification of graph visualizations in terms of data, entity, change, and encoding. Our implementation empowers users to conveniently create, compare, and modulate comprehensive graph visualizations with a wide range of styles. We showcase various examples to verify the expressiveness of Nuwa. Via an expert interview and the analysis on cognitive dimensions we evaluate the usability of Nuwa.

关键词： Analytical models Authoring systems Costs Semantics Data visualization Prototypes Programming

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ConceptExplorer: Visual Analysis of Concept Drifts in Multi-source Time-series Data

ConceptExplorer: Visual Analysis of Concept Drifts in Multi-...

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IEEE Symposium on Visual Analytics Science and Technology (VAST)

作者： Xumeng Wang Wei Chen Jiazhi Xia Zexian Chen Dongshi Xu Xiangyang Wu Mingliang Xu Tobias Schreck State Key Lab of CAD&CG Zhejiang University School of Computer Science and Engineering Central South University College of Information Engineering China Jiliang University Institute of Graphics and Image Hangzhou Dianzi University Zhengzhou University Graz University of Technology

ISBN: (数字)9781728180090

ISBN: (纸本)9781728180106

Time-series data is widely studied in various scenarios, like weather forecast, stock market, customer behavior analysis. To comprehensively learn about the dynamic environments, it is necessary to comprehend features from multiple data sources. This paper proposes a novel visual analysis approach for detecting and analyzing concept drifts from multi-sourced time-series. We propose a visual detection scheme for discovering concept drifts from multiple sourced time-series based on prediction models. We design a drift level index to depict the dynamics, and a consistency judgment model to justify whether the concept drifts from various sources are consistent. Our integrated visual interface, ConceptExplorer, facilitates visual exploration, extraction, understanding, and comparison of concepts and concept drifts from multi-source time-series data. We conduct three case studies and expert interviews to verify the effectiveness of our approach.

关键词： Predictive models Data visualization Data models Adaptation models Indexes Analytical models Visual analytics

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ConceptExplorer: Visual Analysis of Concept Driftsin Multi-source Time-series Data

arXiv

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arXiv 2020年

作者： Wang, Xumeng Xu, Dongshi Chen, Wei Wu, Xiangyang Xia, Jiazhi Xu, Mingliang Chen, Zexian Schreck, Tobias State Key Lab of CAD&CG Zhejiang University China College of Information Engineering China Jiliang University China Institute of Graphics and Image Hangzhou Dianzi University China School of Computer Science and Engineering Central South University China Zhengzhou University China Graz University of Technology Austria

关键词： Time series

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Opacity volume based halo generation and depth-dependent halos

Opacity volume based halo generation and depth-dependent hal...

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作者： Tao, Yubo Wang, Chao Lin, Hai Dong, Feng Clapworthy, Gordon State Key Lab of CAD and CG Zhejiang University Hangzhou China University of Wollongong Wollongong Australia Centre for Computer Graphics and Visualization University of Bedfordshire Luton United Kingdom

Halos are generally used to enhance depth perception and display spatial relationships in illustrative visualization. In this paper, we present a simple and effective method to create volumetric halo illustration. At the preprocessing stage, we generate, on graphics hardware, a view-independent halo intensity volume, which contains all of the potential halos around the boundaries of features, based on the opacity volume. During halo rendering, the halo intensity volume is used to extract halos only around the contours of structures for the current viewpoint. The performance of our approach is significantly faster than previous halo illustration methods, which perform both halo generation and rendering during direct volume rendering. We further propose depth-dependent halo effects, including depth color fading and depth width fading. These halo effects adaptively modulate the visual properties of halos to provide more perceptual cues for depth interpretation. Experimental results demonstrate the efficiency of our proposed approach and the effectiveness of depth-dependent halos. © 2012 Springer-Verlag Berlin Heidelberg.

关键词： Volume rendering

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Laplacian musculoskeletal deformation for patient-specific simulation and visualisation

Laplacian musculoskeletal deformation for patient-specific s...

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2013 17th International Conference on Information Visualisation, IV 2013

作者： Zhao, Youbing Clapworthy, Gordon J. Kohout, Josef Dong, Feng Tao, Yubo Wei, Hui McFarlane, Nigel Centre for Computer Graphics and Visualisation University of Bedfordshire United Kingdom Department of Computer Science and Engineering University of West Bohemia Plzeò Czech Republic State Key Lab. of CAD and CG Zhejiang University Hangzhou China

ISBN: (纸本)9780769550497

In many biomedical applications, it is often desired to simulate, analyse and visualise the dynamics of a particular patient based on a patient-specific musculoskeletal model. However, reconstructing a patient-specific model directly from medical images is highly labour intensive, and impractical in the clinical context. A more efficient method is to derive it from an atlas musculoskeletal model using patient-specific hints. In this paper, Laplacian mesh processing is introduced to deform an atlas model to a patient-specific model, based on patient-specific landmarks extracted from two orthogonal clinical images and using least-squares error optimization. Muscle attachment landmarks and motion landmarks in the atlas are also transformed as part of the process. Drift and inter-surface penetrations are prevented by supplementary inter-surface landmarks. Mesh simplification and reconstruction are used to avoid out-of-memory failures that may result from trying to deform models at high resolution. © 2013 IEEE.

关键词： Deformation

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Volume Upscaling Using Local Self-Examples for High Quality Volume Visualization

Volume Upscaling Using Local Self-Examples for High Quality ...

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IEEE International Conference on computer-Aided Design and computer graphics

作者： Qirui Wang Yubo Tao Chao Wang Feng Dong Hai Lin Gordon Clapworthy State Key Lab of CAD&CG Zhejiang University Zhejiang China Centre for Computer Graphics & Visualization University of Bedfordshire Luton UK

Volume up scaling enlarges the size of a volume to make feature analysis more accurate and efficient. Linear interpolation, widely used in volume up scaling, result in jagged artifacts around features and losses of high-frequency components. Based on the example-based up scaling framework, this paper presents a new high-quality volume up scaling technique, predicting the high-frequency components by searching for the best matched patch in the input volume. As each slice can be taken as an image, the existing image up scaling technique based on the local self-similarity assumption can be directly applied to achieve slice up scaling. We further validate that the local self-similarity assumption is still valid for 3D volumes, and we extend this technique to 3D volume up scaling, i.e., isotropic volume up scaling. We compare our volume up scaling technique with traditional linear and cubic spline interpolations, and demonstrate that our method can generate a higher quality volume with better shape and details preserved. The proposed volume up scaling technique is well suitable for legacy low-resolution volumes to improve their visual qualities in visualization and analysis.

关键词： Interpolation Rendering (computer graphics) Image resolution Three-dimensional displays Biomedical imaging Visualization Image reconstruction

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Laplacian Musculoskeletal Deformation for Patient-Specific Simulation and Visualisation

Laplacian Musculoskeletal Deformation for Patient-Specific S...

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International Conference on Information Visualisation (IV)

作者： Youbing Zhao Gordon J. Clapworthy Josef Kohout Feng Dong Yubo Tao Hui Wei Nigel McFarlane Centre for Computer Graphics and Visualisation University of Bedfordshirc UK Department of Computer Science & Engineering University of West Bohemia Plzeñ Czech Rep State Key Lab. of CAD&CG Zhejiang University Hangzhou China

关键词： Laplace equations Deformable models Linear systems Muscles Bones Surface treatment

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Opacity volume based halo generation for enhancing depth perception

Opacity volume based halo generation for enhancing depth per...

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12th International Conference on computer-Aided Design and computer graphics, cad/graphics 2011

作者： Tao, Yubo Lin, Hai Dong, Feng Clapworthy, Gordon State Key Lab. of CAD and CG Zhejiang University China Centre for Computer Graphics and Visualisation University of Bedfordshire United Kingdom

ISBN: (纸本)9780769544977

Halos are usually used to enhance depth perception and display spatial relationships in illustrative visualization. In this paper, we present a simple and effective method to create volumetric halo illustration. In the pre-processing stage, we generate a view-independent halo intensity volume, which contains all potential halos around the boundaries of features, based on the opacity volume on graphic hardware. During halo rendering, the halo intensity volume is used to extract halos only around the contours of structures for the current viewpoint. The performance of our approach is significantly faster than previous halo illustration methods, which perform both halo generation and rendering during volume rendering. Experimental results demonstrate volumetric halo effects and the efficiency of the proposed approach. © 2011 IEEE.

关键词： Volume rendering

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