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

作者： Yang, Bailin Wang, Xun Li, Frederick W.B. College of Computer Science and Information Engineering Zhejiang Gongshang University Hangzhou China School of Engineering and Computing Sciences University of Durham United Kingdom

ISBN: (纸本)9780769542058

In this paper, we propose a salient region detection method for textured 3D models. We define the salient region, not only based on geometry properties, such as mean curvature, but also based on texture properties, such as texture color. Feature maps of geometry and texture are combined to form a saliency map for capturing the visually important regions of a textured 3D model. During the feature maps construction, we apply a novel filter window to obtain proper sample vertices and texels from the 3D geometry domain and 2D texture image domain. Given the saliency map, we have developed a model reduction method, which comprises the geometry simplification mechanism and the texture space optimization mechanism. Experimental results show that the salient regions of a model can be well preserved even if the model texture and geometry are simplified heavily. © 2010 IEEE.

关键词： Geometry

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Automatic camera placement for image-based modeling 7

Automatic camera placement for image-based modeling

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

作者： Fleishman, Shachar Cohen-Or, Daniel Lischinski, Dani Computer Science Department Tel-Aviv University Ramat-Aviv69978 Israel Institute of Computer Science Hebrew University Jerusalem91904 Israel

ISBN: (纸本)0769502938

We present an automatic camera placement method for generating image-based models from scenes with known geometry. Our method first approximately determines the set of surfaces visible from a given viewing area and then selects a small set of appropriate camera positions to sample the scene from. We define a quality measure for a surface as seen, or covered, from the given viewing area. Along with each camera position, we store the set of surfaces which are best covered by this camera. Next, one reference view is generated from each reference view that do not belong to the selected set of polygons are masked out. The image-based model generated by our method, covers every visible surface only once, associating it with a camera position from which it is covered with quality that exceeds a user-specified quality threshold. The result is a compact non-redundant image-based model with controlled quality. The problem of covering every visible surface with a minimum number of cameras (guards) can be regarded as an extension to the well-known Art Gallery Problem. However, since the 3D polygonal model is textured, the camera-polygon visibility relation is not binary;instead, it has a weight-the quality of the polygon's coverage. © 1999 IEEE.

关键词： Cameras

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Rate-distortion optimized progressive 3D reconstruction from multi-view images

Rate-distortion optimized progressive 3D reconstruction from...

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

作者： Nghiem, Viet Nam Cai, Jianfei Zheng, Jianmin School of Computer Engineering Nanyang Technological University Singapore Singapore

ISBN: (纸本)9780769542058

Most of the previous multi-view reconstruction algorithms focus on minimizing reconstruction distortion, i.e. reconstructing a 3D model as close to the real object as possible, and rely on subsequent simplification process to control the reconstruction rate for practical usage. In this paper, in addition to reconstruction distortion, we directly consider the reconstruction rate in wide-baseline multi-view reconstruction. In particular, we develop a novel rate-distortion efficient multi-view reconstruction system, which consists of two major components: the PDE-based mesh optimization and the local subdivision based mesh refinement. Although both components are prior arts, to achieve rate-distortion optimization, new ingredients are proposed including non-uniform sample distribution for efficient and accurate surface distortion approximation in mesh optimization and non-uniform vertex distribution in mesh refinement. From a set of calibrated and segmented wide baseline images, our developed system is able to reconstruct the optimal 3D mesh that achieves minimum reconstruction distortion at any rate within a certain range. Experimental results show that our proposed system significantly outperforms the original PDE-based reconstruction method in both rate-distortion performance and visual quality. © 2010 IEEE.

关键词： Three dimensional computer graphics

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RGVis: Region growing based techniques for volume visualization 11

RGVis: Region growing based techniques for volume visualizat...

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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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Real-Time Watercolor for Animation

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Journal of computer Science & Technology 2006年第2期21卷 159-165页

作者： Thomas Luft Oliver Deussen Depurtment of Computer and Information Science University of KonstanzKonstanzGermang

We present algorithms that allow for reat-time rendering of 3D-scenes with a watercolor painting appearance,Our approach provides an appropriate simplification of the visual complexity,initates characteristic natural effects of watercolor,and provides two essential painting techniques,the wet-on-wet and the wet-on-dry *** concentrate on efficient algorithms based on image space processing rather than on an exact *** allows for the real-time rendering of *** an animation a high frame-to-frame coherence can be achieved due to a stable segmentation ***,we seamlessly integrate a smooth illumination into the watercolor renderings nsing information from the 3D-scenc.

关键词： non-photorealistic rendering watercolor painting,real-time rendering

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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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