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11th pacific conference on computer graphics and applications, PG 2003

作者： Huang, Runzhen Ma, Kwan-Liu Department of Computer Science University of California at Davis United States

ISBN: (纸本)0769520286

Interactive data visualization is inherently an iterative trial-and-error process searching for an ideal set of parameters for classifying and rendering features of interest in the data. This paper presents 3-d region growing based techniques that can assist the users to locate and define features of interest in volume data more quickly and more accurately. One technique employs partial region growing to generate a 2-d transfer function that effectively reveals the full features of interest. The other technique uses the result of full region growing to systematically construct a boundary surface for the extracted features. The resulting polygonal representation of the boundary surface can facilitate comparison, measurement, and simulation. A visual assessment method is suggested by using the extracted volume and surface information. These techniques either shorten or completely eliminate the typical trial-and-error step in the process of interactive data exploration. © 2003 IEEE.

关键词： Data mining

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Automatic 3D posing from 2D hand-drawn sketches 22

Automatic 3D posing from 2D hand-drawn sketches

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22nd pacific conference on computer graphics and applications, PG 2014

作者： Gouvatsos, Alexandros Xiao, Zhidong Marsden, Neil Zhang, Jian J. Centre for Digital Entertainment National Centre for Computer Animation Bournemouth University United Kingdom Hibbert Ralph Animation United Kingdom

ISBN: (纸本)9783905674736

Inferring the 3D pose of a character from a drawing is a non-trivial and under-constrained problem. Solving it may help automate various parts of an animation production pipeline such as pre-visualisation. In this paper, a novel way of inferring the 3D pose from a monocular 2D sketch is proposed. The proposed method does not make any external assumptions about the model, allowing it to be used on different types of characters. The 3D pose inference is formulated as an optimisation problem and a parallel variation of the Particle Swarm Optimisation algorithm called PARAC-LOAPSO is utilised for searching the minimum. Testing in isolation as well as part of a larger scene, the presented method is evaluated by posing a lamp and a horse character. The results show that this method is robust and is able to be extended to various types of models. © The Eurographics Association 2014.

关键词： Drawing (graphics)

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NeuroEnveloping: A transferable character skin deformation technique

NeuroEnveloping: A transferable character skin deformation t...

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Proceedings - 12th pacific conference on computer graphics and applications, PG 2004

作者： Guo, Zheng Wong, Kok Cheong School of Computer Engineering Nanyang Technological University Singapore Singapore

ISBN: (纸本)0769522343

We proposed a novel character skin deformation method, namely neuroEnveloping. The main idea relies on employing artificial neural networks to learn how to synthesize deformable skin from example shapes paired with skeleton postures of a character. Furthermore, having encoded the deformation information in the neural networks, the skinning model can be applied for the deformation of other similar characters. The character skin is decomposed into patches according to a base control mesh which is introduced as a common platform in the proposed framework. The deformation of each patch of the character is controlled by a trained neural network. We devised an effective stitching operator to eliminate discontinuities between neighboring patches. The experimental results shows that the proposed approach can generate aesthetically pleasing results at interactive speed. © 2004 IEEE.

关键词： Neural networks

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Physical touch-up of human motions 11

Physical touch-up of human motions

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11th pacific conference on computer graphics and applications, PG 2003

作者： Shin, Hyun Joon Kovar, L. Gleicher, M. University of Wisconsin United States

ISBN: (纸本)0769520286

Many popular motion editing methods do not take physical principles into account potentially producing implausible motions. This paper introduces an efficient method for touching up edited motions to improve physical plausibility. We start by estimating a mass distribution consistent with reference motions known to be physically correct. The edited motion is then divided into ground and flight stages and adjusted to enforce appropriate physical laws, for, respectively, zero moment point (ZMP) constraints and correct ballistic trajectory. Unlike previous methods, we do not solve a nonlinear optimization to calculate the adjustment. Instead, closed-form methods are used to construct a hierarchical displacement map which sequentially refines user-specified degrees of freedom at different scales. This is combined with standard methods for kinematic constraint enforcement, yielding an efficient and scalable editing method that allows users to model real human behaviors. The potential of our approach is demonstrated in a number of examples. © 2003 IEEE.

关键词： computer graphics

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Modeling in Multi-Resolution and Its applications

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Journal of computer Science & Technology 2006年第2期21卷 272-278页

作者： Sungchan Kim Kunwoo Lee Taesik Hong Moonki Jung School of Mechanical and Aerospace Engineering Seoul National University San 56-1 Sillim-Dong Gwanak-Gu Seoul 151-752 Korea

It is becoming common for many designers to work together on very complex assemblies in a collaborative environment. To work efficiently in this environment, the capabilities to simplify the portions of an assembly and to reset it to the original resolution should be added to the current CAD systems. Thus operators realizing multi-resolution on B-rep were proposed in previous work. This paper illustrates a prototype multi-resolution system to integrate the proposed operators and its applications. The multi-resolution system can be used in similarity comparisons to reduce the calculation load and to get the full comparison result in the overall shape. Then the features recognized with this system can be used in more detailed comparisons. This system also can be used conceptually to solve security problems in collaborative design.

关键词： collaborative design level of detail multi-resolution similarity comparison

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An architectural extension to the media core process or for HDTV applications

An architectural extension to the media core process or for ...

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Asia-pacific conference on Circuits and Systems

作者： Yoshioka, K Oka, H Nishida, H Matsuura, R Kiyohara, T Matsushita Elect Ind Co Ltd Kadoma Osaka 571 Japan

ISBN: (纸本)0780376900

In this paper, we introduce an architectural extension to the Media Core Processor (MCP), which targets a system solution for consumer multimedia products. This extension implements HDTV video decoding (1080i, 720p, 480p. and 480i), video resizing, 2-D graphics rendering, and conversion between various video formats for data broadcasting. For pixel-level operations in HDTV applications, a SIMD-style processor has been introduced. However, image resizing causes a difference in data structure between source and result dynamically. Therefore, an advanced inter-PE (Processing Element) communication mechanism is necessary as an extension to the common SIMD-style architecture. This processor achieves the flexibility of pixel-level operation and the efficiency of high bandwidth. Adopting this new MCP architecture enabled us to improve image quality to fulfill the requirements for consumer products.

关键词： Bandwidth Data structures Decoding graphics HDTV Image converters Image quality Multimedia communication Rendering (computer graphics) Videos

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Light-guided tree modeling of diverse biomorphs 23

Light-guided tree modeling of diverse biomorphs

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23rd pacific conference on computer graphics and applications, PG 2015

作者： Yi, Lei Li, Hongjun Guo, Jianwei Deussen, Oliver Zhang, Xiaopeng School of Computer Science Northwestern Polytechnical University Xi'an China NLPR-LIAMA Institute of Automation CAS Beijing China College of Science Beijing Forestry University Beijing China University of Konstanz Konstanz Germany

ISBN: (纸本)9783905674965

Creation of tree models faithful to light environment is an important task in computer graphics as well as in botanical research, such as horticulture and forestry. In this paper, we propose an approach to model virtual trees with constraints of light resources and tree morphological properties. By the allocation of received light resources, tree model parameters are estimated, including branching directions and branching sizes. The light energy is calculated by sampling the environmental space, so that the final architecture of trees could be modeled corresponding to its growth environments. Experimental results show that the proposed method create trees with architectures guided by light resources. © The Eurographics Association 2015.

关键词： Horticulture

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Gaze attention and flow visualization using the smudge effect 27

Gaze attention and flow visualization using the smudge effec...

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27th pacific conference on computer graphics and applications, pacific graphics 2019

作者： Yoo, Sangbong Jeong, Seongmin Kim, Seokyeon Jang, Yun Department of Computer Engineering Sejong University Seoul Korea Republic of

ISBN: (纸本)9783038680994

Many advanced gaze visualization techniques have been developed continuously based on the fundamental gaze visualizations such as scatter plots, attention map, and scanpath. However, it is not easy to locate challenging visualization techniques that resolve the limitations presented in the conventional gaze visualizations. Therefore, in this paper, we propose a novel visualization applying the smudge technique to the attention map. The proposed visualization intuitively shows the gaze flow and AoIs (Area of Interests) of an observer. Besides, it provides fixation, saccade, and micro-movement information, which allows us to respond to various analytical goals within a single visualization. Finally, we provide two case studies to show the effectiveness of our technique. © 2019 The Author(s) Eurographics Proceedings © 2019 The Eurographics Association.

关键词： Visualization

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Skeleton-based generalized cylinder deformation under the relative curvature condition 26

Skeleton-based generalized cylinder deformation under the re...

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26th pacific conference on computer graphics and applications, pacific graphics 2018

作者： Ma, R. Zhao, Q. Wang, R. Damon, J. Rosenman, J. Pizer, S. UNC Chapel Hill Computer Science UNC Chapel Hill Mathematics UNC Chapel Hill Radiation Oncology

ISBN: (纸本)9783038680734

Deformation of a generalized cylinder with a parameterized shape change of its centerline is a non-trivial task when the surface is represented as a high-resolution triangle mesh, particularly when self-intersection and local distortion are to be avoided. We introduce a deformation approach that satisfies these properties based on the skeleton (densely sampled centerline and cross sections) of a generalized cylinder. Our approach uses the relative curvature condition to extract a reasonable centerline for a generalized cylinder whose orthogonal cross sections will not intersect. Given the desired centerline shape as a parametric curve, the displacements on the cross sections are determined while controlling for twisting effects, and under this constraint a vertex-wise displacement field is calculated by minimizing a quadratic surface bending energy. The method is tested on complicated generalized cylindrical objects. In particular, we discuss one application of the method for human colon (large intestine) visualization. © 2018 The Author(s).

关键词： Deformation

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A Drone Video Clip Dataset and its applications in Automated Cinematography

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computer graphics FORUM 2022年第7期41卷 189-203页

作者： Ashtari, Amirsaman Jung, Raehyuk Li, Mingxiao Noh, Junyong Korea Adv Inst Sci & Technol Daejeon South Korea Univ Waterloo Waterloo ON Canada

Drones became popular video capturing tools. Drone videos in the wild are first captured and then edited by humans to contain aesthetically pleasing camera motions and scenes. Therefore, edited drone videos have extremely useful information for cinematography and for applications such as camera path planning to capture aesthetically pleasing shots. To design intelligent camera path planners, learning drone camera motions from these edited videos is essential. However, first, this requires to filter drone clips and extract their camera motions out of these edited videos that commonly contain both drone and non-drone content. Moreover, existing video search engines return the whole edited video as a semantic search result and cannot return only drone clips inside an edited video. To address this problem, we proposed the first approach that can automatically retrieve drone clips from an unlabeled video collection using high-level search queries, such as "drone clips captured outdoor in daytime from rural places". The retrieved clips also contain camera motions, camera view, and 3D reconstruction of a scene that can help develop intelligent camera path planners. To train our approach, we needed numerous examples of edited drone videos. To this end, we introduced the first large-scale dataset composed of edited drone videos. This dataset is also used for training and validating our drone video filtering algorithm. Both quantitative and qualitative evaluations have confirmed the validity of our method.

关键词： cinematography aerial videography dataset motion planning quadrotor camera

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