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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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Bokeh rendering with a physical lens 20

Bokeh rendering with a physical lens

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20th pacific conference on computer graphics and applications, PG 2012

作者： Liu, Xin Rokne, Jon Department of Computer Science University of Calgary CalgaryABT2N 1N4 Canada

ISBN: (纸本)9783905673944

Bokeh is important for the realism and aesthetics of graphical rendering, but hard to simulate. In this paper, we propose a novel method that conceptually shoots a 3D display with a physical camera. While a high-quality 3D display is not available, we render the 3D scene layer by layer on a 2D display, and shoot each rendered layer with a physical camera whose focus is adjusted to produce the right amount of blurs. The pure colours and opacities of each layer are extracted by a matting technique and then combined into a single image by alpha blending. The proposed method provides an alternative to bokeh simulation by purely computational algorithms. © The Eurographics Association 2012.

关键词： Three dimensional displays

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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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SharedWeb - a shared virtual environment over World Wide Web

SharedWeb - a shared virtual environment over World Wide Web

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Proceedings of the 1997 5th pacific conference on computer graphics and applications

作者： Huang, Jiung-Yao Fang-Tsou, Chao-Tsou Chen, Jui-Fa Wang, Fu-Bin Tamkang Univ Taipei Taiwan

This paper describes the design, implementation, and experimental results for a multiple user 3D web browsing system, called SharedWeb system, which is based on the request-response method of WWW server. The key features of this system include WWW server's ability to remember all the browsers connected to this server in order to transmit the messages required to maintain consistent states among browsers, the Dead Reckoning technique of DIS used by browsers in order to reduce the number of messages sent out on the network and to satisfy the timing requirement demanded by the virtual environments, and Protocol Data Unit (PDU) used in DIS also adapted by SharedWeb system in order not only to include more information about browsers but also to integrate with DIS in the near future.

关键词： Interactive computer systems

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Rendering of spherical light fields

Rendering of spherical light fields

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Proceedings of the 1997 5th pacific conference on computer graphics and applications

作者： Ihm, Insung Park, Sanghoon Lee, Rae Kyoung Sogang Univ Seoul Korea Republic of

A plenoptic function is a parameterized function describing the flow of light in space, and has served as a key idea in building some of the recent image-based rendering systems. This paper presents a new representation scheme, called a spherical light field, of the plenoptic function, that is based on spheres. While methods using spherical coordinates are thought to require substantially more computation than those using planar or cylindrical coordinates, we show that spheres can also be used efficiently in representing and resampling the flow of light. Our image-based rendering algorithm is different from the previous systems, the light field and lumigraph, in that it is an `object-space' algorithm that can be easily embedded into the traditional polygonal rendering system. Our method is easily accelerated by 3D graphics boards that support the primitive functionality, such as viewing and smooth shading. In addition, we introduce an encoding scheme based on wavelets for compression of the huge data resulting from sampling of the spherical light field. The proposed technique can be easily adapted to compress the light field and lumigraph data, and offers as high compression ratios as the previous methods. Furthermore, it naturally creates a multi-resolutional representation of the light flow that can be exploited effectively in the future applications. We show how to access the compressed data efficiently using a modified significance map and an incremental decoding technique, and report experimental results on several test data sets.

关键词： Three dimensional computer graphics

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Detecting and Localizing Visual Inconsistencies in Web applications 23

Detecting and Localizing Visual Inconsistencies in Web Appli...

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23rd Asia-pacific Software Engineering conference (APSEC)

作者： Mahajan, Sonal Gadde, Krupa Benhur Pasala, Anjaneyulu Halfond, William G. J. Univ Southern Calif Los Angeles CA 90007 USA Infosys Ltd Bangalore Karnataka India

ISBN: (纸本)9781509055753

Failures in the presentation layer of a web application can negatively impact its usability and end users' perception of the application's quality. The problem of verifying the consistency of a web application's user interface across its different pages is one of the many challenges that software development teams face in testing the presentation layer. In this paper we propose a novel automated approach to detect and localize visual inconsistencies in web applications. To detect visual inconsistencies, our approach uses computer vision techniques to compare a test web page with its reference. Then to localize, our approach analyzes the structure and style of the underlying HTML elements to find the faulty elements responsible for the observed inconsistencies.

关键词： HTML Visualization Web pages Rendering (computer graphics) Cascading style sheets Erbium Usability

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View Dependent Sequential Point Trees

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Journal of computer Science & Technology 2006年第2期21卷 181-188页

作者：王文成魏峰吴恩华 State Key Lab of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100080 P.R. China Department of Computer and Information Science Faculty of Science and Technology University of Macao Macao Special Administration Region P.R. China Graduate University of Chinese Academy of Sciences Beijing 100039 P.R. China

Sequential point trees provide the state-of-the-art technique for rendering point models, by re-arranging hierarchical points sequentially according to geometric errors running on GPU for fast rendering. This paper presents a view dependent method to augment sequential point trees by embedding the hierarchical tree structures in the sequential list of hierarchical points. By the method, two kinds of indices are constructed to facilitate the points rendering in an order mostly from near to far and from coarse to fine. As a result, invisible points can be culled view-dependently in high efficiency for hardware acceleration, and at the same time, the advantage of sequential point trees could be still fully taken. Therefore, the new method can run much faster than the conventional sequential point trees, and the acceleration can be highly promoted particularly when the objects possess complex occlusion relationship and viewed closely because invisible points would be in a high percentage of the points at finer levels.

关键词： view dependence visibility culling GPU point-based rendering real time rendering

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Ellipsoidal cube maps for accurate rendering of planetary-scale terrain data 20

Ellipsoidal cube maps for accurate rendering of planetary-sc...

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20th pacific conference on computer graphics and applications, PG 2012

作者： Lambers, M. Kolb, A. Computer Graphics Group University of Siegen Germany

ISBN: (纸本)9783905673944

Advances in sensor technology lead to a rapidly growing number of terrain data sets with very high spatial resolution. To allow reliable visual analysis of this data, terrain data for planetary objects needs to be rendered with accurate reproduction of every detail. This combination of very large scale and very fine detail is challenging for multiple reasons: the numerical accuracy of typical data types is not sufficient, simple spherical planet models fail to accurately represent the data, and distortions in map projections used for data storage lead to sampling problems. In this paper, we propose the Ellipsoidal Cube Map model to address these problems. We demonstrate the possibilities of the model using a simple renderer implementation that achieves interactive frame rates for a variety of data sets for Earth, Moon, and Mars. © The Eurographics Association 2012.

关键词： Digital storage

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