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computer-assisted auto coloring by region matching 11

Computer-assisted auto coloring by region matching

引用

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

作者： Qiu, Jie Seah, Hock Soon Tian, Feng Chen, Quan Melikhov, K. Center for Graphics and Imaging Technology Nanyang Technological University Nanyang Avenue Singapore639798 Singapore

ISBN: (纸本)0769520286

computer-assisted auto coloring (CAAC) has great potential in terms of lowering production cost and saving time in cel animation production. In this paper, a novel approach to automatically color the animation character of line drawings based on region matching and master frames is proposed. Firstly, some important attributes of a region such as curve length, character points, area etc. are investigated. Then, based on these attributes, a detailed process of region matching is presented followed by the coloring process. The results show that our approach can straightforwardly handle most cases, hence the aim of saving time and labor is realized. © 2003 IEEE.

关键词： Animation

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An improved TIN compression using Delaunay triangulation 7

An improved TIN compression using Delaunay triangulation

引用

7th pacific conference on computer graphics and applications, pacific graphics 1999

作者： Kim, Yang-Soo Park, Dong-Gyu Jung, Ho-Youl Cho, Hwan-Gue Dong, Jang-Jun Ku, Keum-Jung Department of Computer Science Pusan Nation University Keum-Jung Ku Pusan609-735 Korea Republic of

ISBN: (纸本)0769502938

In this paper we introduce a new compression technique for the connectivity of a Triangulated Irregular Network (TIN) by using Delaunay triangulation. The strategy in this paper is based on that most of 2.5 dimensional terrain connection are very similar to plane-projected Delaunay triangulation of their vertex set. We only need to keep the vertex coordinates and a few edges that are not included in the Delaunay edges. We present an efficient encoding method for the set of edges using vertex reordering and general bracketing algorithm. Also we propose progressive visualization method for web-based GIS. In the experiments, the method was examined on several TIN data with various resolutions, which were generated by five typical terrain simplification algorithms. The connectivity information of common terrain data could be compressed by 0.23 bits per vertex. © 1999 IEEE.

关键词： Triangulation

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Modeling detailed cloud scene from multi-source images 26

Modeling detailed cloud scene from multi-source images

引用

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

作者： Cen, Yunchi Liang, Xiaohui Chen, Junping Yang, Bailin Li, Frederick W.B. State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing100191 China School of Computer Science and Information Engineering Zhejiang Gongshang University Hangzhou310018 China Department of Computer Science University of Durham DurhamDH1 3LE United Kingdom

ISBN: (纸本)9783038680734

Realistic cloud is essential for enhancing the quality of computer graphics applications, such as flight simulation. Data-driven method is an effective way in cloud modeling, but existing methods typically only utilize one data source as input. For example, natural images are usually used to model small-scale cloud with details, and satellite images and WRF data are used to model large scale cloud without details. To construct large-scale cloud scene with details, we propose a novel method to extract relevant cloud information from both satellite and natural images. Experiments show our method can produce more detailed cloud scene comparing with existing methods. © 2018 The Author(s).

关键词： Flight simulators

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Implitcitizing bi-cubi toric surfaces by dixon alpha-resultant quotients 11

Implitcitizing bi-cubi toric surfaces by dixon alpha-resulta...

引用

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

作者： Foo, Mao-Ching Chionh, Eng-Wee Computer Science Department National University of Singapore 117543 Singapore

ISBN: (纸本)0769520286

Toric surface patches have two significant geometric properties: they are multi-sided and they are generalizations of both the triangular and rectangular Bezier surface patches. They also have a very nice algebraic property: their implicit equations are closely related to the Dixon determinant. In particular, for bi-cubic toric patches without base points, their implicit equation can always be obtained very conveniently using the recently discovered Dixon quotients. In this paper, we explain the relevance of monomial corner cutting to toric patches, and how this leads to their efficient implicitization by the Dixon quotient. Many examples are given to illustrate the simplicity and power of this approach. © 2003 IEEE.

关键词： Chromium

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TAvE: Template-based augmentation of visual effects to human actions in videos 26

TAvE: Template-based augmentation of visual effects to human...

引用

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

作者： Liu, J. Zhou, X. Fu, H. Tai, C.L. Department of Computer Science and Engineering HKUST School of Creative Media City University of Hong Kong Hong Kong

ISBN: (纸本)9783038680734

We present TAVE, a framework that allows novice users to add interesting visual effects by mimicking human actions in a given template video, in which pre-defined visual effects have already been associated with specific human actions. Our framework is mainly based on high-level features of human pose extracted from video frames, and uses low-level image features as the auxiliary information. We encode an action into a set of code sequences representing joint motion directions and use a finite state machine to recognize the action state of interest. The visual effects, possibly with occlusion masks, can be automatically transferred from the template video to a target video containing similar human actions. © 2018 The Author(s).

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Fast height-field rendering under Image-Based Lighting

Fast height-field rendering under Image-Based Lighting

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18th pacific conference on computer graphics and applications, pacific graphics 2010

作者： Shinoyama, Noriaki Max, Nelson Department of Computer Science Tokyo Institute of Technology Tokyo 152-8552 Japan Department of Computer Science University of California Davis Davis CA 95616 United States

ISBN: (纸本)9780769542058

We propose a new fast height-field rendering method for Image-Based Lighting. Our approach approximates the environmental illumination using spherical radial basis functions (SRBFs). We approximate the integrand of the rendering equation as a sum of products of the SRBFs and the visibility function. Then we solve the integral by approximating the visibility function of each SRBF as the fraction visible above the height-field. This fraction is precomputed into a 2-D texture, as a function of the SRBF size and its angle to the horizon. We use two different approximations of the horizon. The first, called a horizon map, can render more accurate self-occlusion. The second, called a cone map, needs only a single RGBA 2D texture but can only render rough self-shadowing. Our approach can quickly render shading and self-shadowing of a height-field from all-frequency environmental lighting. © 2010 IEEE.

关键词： Lighting

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Adaptive solid texturing for Web3D applications 10

Adaptive solid texturing for Web3D applications

引用

10th pacific conference on computer graphics and applications, PG 2002

作者： Chen, Bing-Yu Nishita, Tomoyuki University of Tokyo Japan

ISBN: (纸本)0769517846

Solid texturing is a well-known computer graphics technology, which is problematic because it consumes too much time if every pixel is calculated on the fly or has a very high memory requirement if all of the pixels are stored at the beginning. Although some methods have been proposed, almost all of them need the support of specific hardware accelerators. Hence, these methods could not be applied to all kinds of machine, especially low-cost ones available over the Internet. Therefore, we present a new method for procedural solid texturing. Our approach could almost render an object with solid texturing in real-time using only a software solution. Furthermore, to demonstrate that our approach is widely applicable we choose pure Java for its implementation, since it does not receive any benefit from hardware and could be executed on the Internet directly. © 2002 IEEE.

关键词： Application programs

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Computing efficient matrix-valued wavelets for meshes

Computing efficient matrix-valued wavelets for meshes

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18th pacific conference on computer graphics and applications, pacific graphics 2010

作者： Zhao, Chong Sun, Hanqiu Qin, Kaihuai Computer Science and Engineering Chinese University of Hong Kong Hong Kong Hong Kong Computer Science and Technology Tsinghua University Beijing China

ISBN: (纸本)9780769542058

In recent years, several subdivision wavelets, which are constructed directly from the subdivision templates, proposed for the triangular and quadrilateral meshes. To reduce the algorithm complexity, most deploy the local lifting and discrete inner product, which are efficient but not yet accurate. In this paper, we propose the novel approach to construct the efficient biorthogonal wavelets based on interpolatory loop subdivisions. Different from the existing subdivision wavelets, the wavelet we develop is directly constructed from the refined bivariate spline function vectors on the six-directional meshes. By applying the lifting operations, the wavelet transforms are finally local and in-place. The new wavelet transform inherits the advantage of interpolatory refinement with more levels of resolution. The numerical experiments we have tested showed that the new wavelet transform is sufficiently stable, and well performed especially in dealing with semi-regular triangular meshes. © 2010 IEEE.

关键词： Wavelet transforms

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A model based technique for realistic oriental painting 10

A model based technique for realistic oriental painting

引用

10th pacific conference on computer graphics and applications, PG 2002

作者： Yu, Young Jung Lee, Young Bok Cho, Hwan Gue Lee, Do Hoon Pusan University of Foreign Studies Korea Republic of Pusan National University Korea Republic of Miryang National University Korea Republic of

ISBN: (纸本)0769517846

Realistic representation of various effects which appear in the real world paintings can be used for several applications like animation or education. To generate oriental paintings, numerous studies have focused on model-based approaches. In this paper, a new model-based approach for oriental paintings is described. To represent the diffusion effects, we propose local equilibrium model (LEM) which is a method to calculate the movement of water and ink effectively. In addition, we propose a paper model with fiber mesh structure and three layers structure on each cell. With this layer model, overlapped strokes can be well represented. A brush model proposed supports several brush effects like shading. © 2002 IEEE.

关键词： computer graphics

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CPU-based tolerance volumes for mesh processing

CPU-based tolerance volumes for mesh processing

引用

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

作者： Botsch, Mario Bommes, David Vogel, Christoph Kobbelt, Leif Computer Graphics Group RWTH Aachen University Germany

ISBN: (纸本)0769522343

In an increasing number of applications triangle meshes represent a flexible and efficient alternative to traditional NURBS-based surface representations. Especially in engineering applications it is crucial to guarantee that a prescribed approximation tolerance to a given reference geometry is respected for any combination of geometric algorithms that are applied when processing a triangle mesh. We propose a simple and generic method for computing the distance of a given polygonal mesh to the reference surface, based on a linear approximation of its signed distance field. Exploiting the hardware acceleration of modern GPUs allows us to perform up to 3M triangle checks per second, enabling real-time distance evaluations even for complex geometries. An additional feature of our approach is the accurate high-quality distance visualization of dynamically changing meshes at a rate of 15M triangles per second. Due to its generality, the presented approach can be used to enhance any mesh processing method by global error control, guaranteeing the resulting mesh to stay within a prescribed error tolerance. The application examples that we present include mesh decimation, mesh smoothing and freeform mesh deformation. © 2004 IEEE.

关键词： computer graphics

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