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Illuminating image-based objects

Illuminating image-based objects

引用

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

作者： Wong, Tien-Tsin Heng, Pheng-Ann Or, Siu-Hang Ng, Wai-Yin Chinese Univ of Hong Kong Hong Kong Hong Kong

In this paper, we present a new scheme of data representation for image-based objects. It allows the illumination to be changed interactively without knowing any geometrical information (e.g. depth or surface normal) of the scene. But the resulting images are physically correct. The scene is first sampled from different view points and under different illuminations. By treating each pixel on the image plane as a surface element, the sampled images are used to measure the apparent BRDF of each surface element. Two compression schemes, spherical harmonics and discrete cosine transform, are proposed to compress the tabular BRDF data. Whenever the user changes the illumination, a certain number of views are reconstructed. The correct user perspective view is then displayed using the standard texture mapping hardware. Hence, the intensity, the type and the number of the light sources can be manipulated interactively.

关键词： computer graphics

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A multiscale deformable model for extracting complex surfaces from volume images 7

A multiscale deformable model for extracting complex surface...

引用

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

作者： Park, Joo-Young McInerney, Tim Terzopoulos, Demetri Kim, Myoung-Hee Department of Computer Science and Engineering Ewha Womans University Seoul Korea Republic of Department of Computer Science Ryerson Polytechnic University Toronto Canada Department of Computer Science University of Toronto Toronto Canada

ISBN: (纸本)0769502938

Deformable surface models are an attractive method for segmenting the three-dimensional shapes of complex anatomic structures in volumetric medical images. Despite the success of this approach, several problems remain. In this paper, we propose a multiscale deformable surface model with non-intersection constraint forces that successfully addresses three significant problems-sensitivity to model initialization, difficulties in dealing with severe object concavities, and model self-intersection. The first two problems are addressed by the multiscale scheme, which progressively resamples the triangulated, deformable surface model both globally and locally, matching its resolution to the levels of a volume image pyramid. We address the third problem by including a non-intersection constraint force among the customary internal and external forces in the physics-based formulation. We apply our new deformable surface model to the challenging task of extracting brain cortical surfaces. © 1999 IEEE.

关键词： Brain

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Boundary determination for trivariate solids 7

Boundary determination for trivariate solids

引用

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

作者： Joy, Kenneth I. Duchaineau, Mark A. Computer Science Department University of California Davis United States Center for Applied Scientific Computing Lawrence Livermore National Laboratory United States

ISBN: (纸本)0769502938

The trivariate tensor-product B-spline solid is a direct extension of the B-spline patch and has been shown to be useful in the creation and visualization of free-form geometric solids. Visualizing these solid objects requires the determination of the boundary surface of the solid, which is a combination of parametric and implicit surfaces. This paper presents a method that determines the implicit boundary surface by examination of the Jacobian determinant of the defining B-spline function. Using an approximation to this determinant, the domain space is adaptively subdivided until a mesh can be determined such that the boundary surface is close to linear in the cells of the mesh. A variation of the marching cubes algorithm is then used to draw the surface. Interval approximation techniques are used to approximate the Jacobian determinant and to approximate the Jacobian determinant gradient for use in the adaptive subdivision methods. This technique can be used to create free-form solid objects, useful in geometric modeling applications. © 1999 IEEE.

关键词： Interpolation

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Integrating occlusion culling into LOD on GPU 22

Integrating occlusion culling into LOD on GPU

引用

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

作者： Peng, Chao Computer Science Department University of Alabama Huntsville United States Eurographics Publications Board

ISBN: (纸本)9783905674736

Real-time rendering of complex 3D models is still a very challenging task. Recently, GPU-based level-of-detail (LOD) approaches have been proposed to fast decrease the complexity of a 3D model, but applying only LOD approaches is usually not sufficient to achieve highly interactive rendering rate for the complex model that contains hundreds of millions of triangles. Visibility culling, especially occlusion culling, needs to be introduced to further reduce the amount of triangles being rendered at each frame. In this paper, we present a novel rendering approach that seamlessly integrates occlusion culling with the LOD approach in a unified scheme towards the GPU architecture. The result shows that the integration significantly reduces the complexity of the 3D model and satisfies the demands of both memory efficiency and performance. © The Eurographics Association 2014.

关键词： graphics processing unit

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Real-time collision detection with two-level spatial hashing on GPU 22

Real-time collision detection with two-level spatial hashing...

引用

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

作者： Hong, Yang Wu, Wen Chen, Hui Department of Computer and Information Science Faculty of Science and Technology University of Macau China Department of Computer Science and Engineering The Chinese University of Hong Kong Hong Kong Beijing Key Lab of Human-Computer Interaction Institute of Software Chinese Academy of Science Beijing China

ISBN: (纸本)9783905674736

In this paper, a two-level parallel spatial hashing method is presented for real-time collision detection of deformable objects based on modern GPU architecture. The second-level of spatial hashing is used to improve the culling efficiency. Moreover, a novel encoding method on GPU is proposed to compensate the inflexibility of the GPU memory system. It can efficiently determine the colliding pairs of primitives between deformable objects. The experimental results show that our method can perform high culling efficiency with low memory cost. © The Eurographics Association 2014.

关键词： graphics processing unit

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Fast volume rendering using adaptive block subdivision

Fast volume rendering using adaptive block subdivision

引用

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

作者： Lee, Choong Hwan Park, Kyu Ho Korea Advanced Inst of Science and Technology Taejon Korea Republic of

This paper proposes a fast volume rendering scheme that greatly reduces ray-casting overheads by an adaptive block subdivision. We first apply a uniform space subdivision for constructing the adaptively subdivided volume. Then we merge coherent uniform blocks to generate adaptive-sized blocks that are efficient for leaping space. To accomplish this, an efficient block merging algorithm based on a boundary following and scan-filling strategy is proposed. Experimental results show that our fast volume rendering scheme is superior to other schemes in constructing a data structure for fast rendering;due to its simple construction approach, construction speed is more than three times faster than a hierarchical data structure, octree. A 25% to 70% performance gain in rendering timing over the octree is also exhibited. Additional advantages of our scheme are a stable acceleration for animation and an associativity with a compression-based volume rendering.

关键词： computer graphics

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3D human body skeleton extraction from consecutive surfaces 27

3D human body skeleton extraction from consecutive surfaces

引用

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

作者： Zhang, Yong Tan, Fei Wang, Shaofan Kong, Dehui Yin, Baocai Beijing Key Laboratory of Multimedia and Intelligent Software Technology Faculty of Information Technology Beijing University of Technology Beijing100124 China Graz Faculty of Electronic Information and Electrical Engineering Dalian University of Technology Dalian116024 China

ISBN: (纸本)9783038680994

Extracting human body skeletons from consecutive surfaces is an important research topic in the fields of computer graphics and human computer interaction, especially in posture estimation and skeleton animation. Current approaches mainly suffer from following problems: insufficient time and space continuity, not robust to background, ambient noise, etc. Our approach is to improve against these shortcomings. This paper proposes a 3D human body skeleton extraction method from consecutive meshes. We extract the consistent skeletons from consecutive surfaces based on shape segmentation and construct skeleton sequences, then we use the continuous frame skeleton point optimization model we proposed to optimize the skeleton sequences, generating the final skeleton point sequences which are more accurate. Finally, we verify that our method can obtain more complete and accurate skeletons compared to other methods through many experiments. © 2019 The Author(s) Eurographics Proceedings © 2019 The Eurographics Association.

关键词： computer graphics

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Frequency-based environment matting

Frequency-based environment matting

引用

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

作者： Zhu, Jiayuan Yang, Yee-Hong University of Alberta Computer Graphics Laboratory Edmonton Canada

ISBN: (纸本)0769522343

Environment matting is a technique to extract the environment matte which is used to describe how an object reflects and refracts the environment light. In this paper, we propose a novel environment matting method to obtain the environment matte of a real scene. Previous methods use different backdrops as the calibration patterns and search for the environment matte in the spatial domain. In our method, however, a series of background images displayed on a screen sequentially in time are interpreted as signals. The frequency similarity of these signals is used as the searching criterion. The frequencies of these signals are not changed when they interact with the foreground objects and thus can be used to extract the environment matte. While using correspondence in the spatial domain in existing approaches is prone to error, using frequency correspondence is not. Thus, our approach is robust to noise and can easily deal with some of the complex light transport phenomena which cannot be easily handled using current methods. The experimental results are very encouraging. © 2004 IEEE.

关键词： Image processing

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Making 3D textures practical 7

Making 3D textures practical

引用

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

作者： Bajaj, Chandrajit Ihm, Insung Park, Sanghun Department of Computer Sciences University of Texas at Austin United States Department of Computer Science Sogang University Korea Republic of

ISBN: (纸本)0769502938

While 2D texture mapping is one of the most powerful rendering techniques that make 3D objects appear visually interesting, it suffers from visual artifacts produced when 2D image patterns are wrapped onto the surface of objects with arbitrary shapes. On the other hand, 3D texture mapping generates highly natural visual effects in which objects appear carved from lumps of materials rather than laminated with thin sheets as in 2D texture mapping. Storing 3D texture images in a table for fast mapping computations, instead of evaluating procedures on the fly, however, has been considered impractical due to the extremely high memory requirements. In this paper, we present a new effective method for 3D texture mapping designed for real-time rendering of polygonal models. Our scheme attempts to resolve the potential texture memory problem arising from the very large size of 3D images by compressing them using a wavelet-based encoding method. The experimental results on various non-trivial 3D textures and polygonal models show that high compression rates are achieved with few visual artifacts in the rendered image and a small impact on rendering time. The simplicity of our compression-based scheme will make it possible to implement practical 3D texture mapping in software/hardware rendering systems including the real-time 3D graphics APIs like OpenGL and Direct3D. © 1999 IEEE.

关键词： Mapping

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Fast Algorithms for computer Generated Islamic Patterns of 8-ZOHREH and 8-SILI

引用

9th pacific Rim conference on Multimedia

作者： Rasouli, Peyman Bastanfard, Azam Rezvanian, Alireza Jalilian, Omid Islamic Azad Univ Hamedan Branch Sama Org Tehran Iran Azad Univ Qazvin Dept Comp Engn barajin Iran

ISBN: (纸本)9783540897958

The interests and tendencies of motivations in generated computer graphics between researchers are increased in recent years. There are many various methods for computer graphics in some applications such as architectural arts. In this paper we present two new algorithms for computer generated Islamic Geometrical Patterns, which are 8-ZOHREH and 8-SILI They are presented as computer algorithms. These algorithms presented and implemented as simple and optimized algorithms. In the proposed algorithms we considered the simple basic rules in geometry such as orthogonal drawing, bisector of angles, and symmetry. The first algorithm generated a main region for 8-ZOHREH in eleven steps and the second algorithm to generate 8-SILI which has twelve steps. Simplicity, robustness, low computational complexity and high speedy are some of the main features of the proposed algorithms. The results of our algorithms are demonstrated in last section.

关键词： Multimedia Application computer graphics Islamic Geometrical Patterns 8-ZOHREH 8-SILI

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