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8th pacific conference on computer graphics and applications

作者： Lecocq, P Michelin, S Arquès, D Kemeny, A Renault- Research Division France University of Marne-la-Vallée France

ISBN: (纸本)0769508685

Many shading models are able to provide realistic rendering of lighting effects under various atmospheric conditions but computational times are often expensive. This paper proposes a method to render lighting effects within participating media in real-time on a graphics workstation. It consists of mathematical approximations based on a re-formulation of the light transport equation considering atmospheric scattering with light sources described by their luminous intensity distribution. Hardware capabilities of graphics computer boards are used to accelerate parts of the rendering process.

关键词： Acceleration Application software Atmospheric modeling computer graphics Hardware Integral equations Light scattering Light sources Rendering (computer graphics) Workstations

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Fast Out-of-Core Octree Generation for Massive Point Clouds

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computer graphics FORUM 2020年第7期39卷 155-167页

作者： Schuetz, Markus Ohrhallinger, Stefan Wimmer, Michael TU Wien Inst Visual Comp Vienna Austria

We propose an efficient out-of-core octree generation method for arbitrarily large point clouds. It utilizes a hierarchical counting sort to quickly split the point cloud into small chunks, which are then processed in parallel. Levels of detail are generated by subsampling the full data set bottom up using one of multiple exchangeable sampling strategies. We introduce a fast hierarchical approximate blue-noise strategy and compare it to a uniform random sampling strategy. The throughput, including out-of-core access to disk, generating the octree, and writing the final result to disk, is about an order of magnitude faster than the state of the art, and reaches up to around 6 million points per second for the blue-noise approach and up to around 9 million points per second for the uniform random approach on modern SSDs.

关键词： computer graphics

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Virtual sandbox 11

Virtual sandbox

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11th pacific conference on computer graphics and applications

作者： Onoue, K Nishita, T Univ Tokyo Bunkyo Ku Tokyo Japan

ISBN: (纸本)0769520286

Interactive applications such as virtual reality systems have become popular in recent years. A ground surface composed of a granular material can be deformed when it comes into contact with an object, and, in this paper, we propose a deformation algorithm for the ground surface which is useful for such applications. The deformation algorithm is divided into three steps: (1) detection of the collision between an object and the ground surface, (2) displacement of the granular material, and (3) erosion of the material at steep slopes. The proposed algorithm can handle objects of various shapes, including a concave polyhedron, and a texture sliding technique is proposed to represent the motion of the granular materials. In addition, the proposed algorithm can be used at an interactive frame rate.

关键词： Application software computer graphics computer performance Deformable models Object detection Shape Sheet materials Soil Virtual reality

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Blending multiple polygonal shapes 11

Blending multiple polygonal shapes

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11th pacific conference on computer graphics and applications

作者： Johan, H Nishita, T Univ Tokyo Tokyo Japan

ISBN: (纸本)0769520286

This paper presents a new method for smoothly blending among multiple polygonal shapes. The blended shape is computed as a weighted average of the input shapes. The weight of each input shape is allowed to vary across the shape. This feature increases the flexibility for controlling the local appearance of the blended shapes. Our method computes the blended shape hierarchically, starting from the coarse version of the shape and adding the details gradually. Several examples are shown to demonstrate the advantages of the proposed method.

关键词： Animation Application software Computational efficiency computer graphics Product design Shape control

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Interactive caustics using local precomputed irradiance

Interactive caustics using local precomputed irradiance

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12th pacific conference on computer graphics and applications (PG 2004)

作者： Wyman, C Hansen, C Shirley, P Univ Iowa Dept Comp Sci Iowa City IA 52242 USA

ISBN: (纸本)0769522343

Bright patterns of light focused via reflective or refractive objects onto matte surfaces are called "caustics". We present a method for rendering dynamic scenes with moving caustics at interactive rates. This technique requires some simplifying assumptions about caustic behavior allowing us to consider it a local spatial property which we sample in a pre-processing stage. Storing the caustic locally limits caustic rendering to a simple lookup. We examine a number of wails to represent this data, allowing us to trade between accuracy, storage, run time, and precomputation time.

关键词： Interactive computer graphics

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Tracing Field-Coherent Quad Layouts

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computer graphics FORUM 2016年第7期35卷 485-496页

作者： Pietroni, Nico Puppo, Enrico Marcias, Giorgio Scopigno, Roberto Cignoni, Paolo CNR ISTI Rome Italy Univ Genoa DIBRIS Genoa Italy

Given a cross field over a triangulated surface we present a practical and robust method to compute a field aligned coarse quad layout over the surface. The method works directly on a triangle mesh without requiring any parametrization and it is based on a new technique for tracing field-coherent geodesic paths directly on a triangle mesh, and on a new relaxed formulation of a binary LP problem, which allows us to extract both conforming quad layouts and coarser layouts containing t-junctions. Our method is easy to implement, very robust, and, being directly based on the input cross field, it is able to generate better aligned layouts, even with complicated fields containing many singularities. We show results on a number of datasets and comparisons with state-of-the-art methods.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.3 [computer graphics]: Picture/Image Generation&mdash Line and curve generation

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Appearance Harmonization for Single Image Shadow Removal

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computer graphics FORUM 2016年第7期35卷 189-197页

作者： Ma, Li-Qian Wang, Jue Shechtman, Eli Sunkavalli, Kalyan Hu, Shi-Min Tsinghua Univ TNList Beijing Peoples R China Adobe Res New York NY USA

Shadow removal is a challenging problem and previous approaches often produce de-shadowed regions that are visually inconsistent with the rest of the image. We propose an automatic shadow region harmonization approach that makes the appearance of a de-shadowed region (produced using any previous technique) compatible with the rest of the image. We use a shadow-guided patch-based image synthesis approach that reconstructs the shadow region using patches sampled from non-shadowed regions. This result is then refined based on the reconstruction confidence to handle unique textures. Qualitative comparisons over a wide range of images, and a quantitative evaluation on a benchmark dataset show that our technique significantly improves upon the state-of-the-art.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.3 [computer graphics]: Picture/Image Generation&mdash

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Spatial Matching of Animated Meshes

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computer graphics FORUM 2016年第7期35卷 21-32页

作者： Seo, H. Cordier, F. Univ Strasbourg ICube Strasbourg France Univ Haute Alsace LMIA Mulhouse France

This paper presents a new technique which makes use of deformation and motion properties between animated meshes for finding their spatial correspondences. Given a pair of animated meshes exhibiting a semantically similar motion, we compute a sparse set of feature points on each mesh and compute spatial correspondences among them so that points with similar motion behavior are put in correspondence. At the core of our technique is our new, dynamic feature descriptor named AnimHOG, which encodes local deformation characteristics. AnimHOG is ob-tained by computing the gradient of a scalar field inside the spatiotemporal neighborhood of a point of interest, where the scalar values are obtained from the deformation characteristic associated with each vertex and at each frame. The final matching has been formulated as a discreet optimization problem that finds the matching of each feature point on the source mesh so that the descriptor similarity between the corresponding feature pairs as well as compatibility and consistency as measured across the pairs of correspondences are maximized. Consequently, reliable correspondences can be found even among the meshes of very different shape, as long as their motions are similar. We demonstrate the performance of our technique by showing the good quality of matching results we obtained on a number of animated mesh pairs.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.5 [computer graphics]: Computational Geometry and Object Modeling&mdash Geometric algorithms languages and systems I.3.6 [computer graphics]: Methodology and Techniques&mdash graphics data structures and data types I.3.7 [computer graphics]: Three-Dimensional graphics and Realism&mdash Animation

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CSG tree rendering for point-sampled objects

CSG tree rendering for point-sampled objects

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12th pacific conference on computer graphics and applications (PG 2004)

作者： Wicke, M Teschner, M Gross, M ETH Zurich Switzerland

ISBN: (纸本)0769522343

This paper presents an algorithm for rendering of point sampled CSG models. The approach works with arbitrary CSG trees of surfel models with arbitrary sampling densities. Edges and corners are rendered by reconstructing the involved surfaces separately. The reconstructed surfaces are clipped at intersections. This way, blurring at any magnification is avoided. As opposed to existing methods, which resample surfaces close to object intersections, the proposed approach preserves the original object representation. Since no resampling is needed, dynamic scenes can be handled very flexible. Complex intersections involving any number of objects can be rendered.

关键词： computer graphics

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Perceptual Evaluation of Color-to-Grayscale Image Conversions

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computer graphics FORUM 2008年第7期27卷 1745-1754页

作者： Cadik, M. Czech Tech Univ CR-16635 Prague Czech Republic

Color images often have to be converted to grayscale for reproduction, artistic purposes, or for subsequent processing. Methods performing the conversion of color images to grayscale aim to retain as much information about the original color image as possible, while simultaneously producing perceptually plausible grayscale results. Recently, many methods of conversion have been proposed, but their performance has not yet been assessed. Therefore, the strengths and weaknesses of color-to-grayscale conversions are not known. In this paper, we present the results of two subjective experiments in which a total of 24 color images were converted to grayscale using seven state-of-the-art conversions and evaluated by 119 human subjects using a paired comparison paradigm. We surveyed nearly 20000 human responses and used them to evaluate the accuracy and preference of the color-to-grayscale conversions. To the best of our knowledge, the study presented in this paper is the first perceptual evaluation of color-to-grayscale conversions. Besides exposing the strengths and weaknesses of the researched methods, the aim of the study is to attain a deeper understanding of the examined field, which can accelerate the progress of color-to-grayscale conversion.

关键词： I.3.3 [computer graphics]: Picture/Image Generation–Display algorithms viewing algorithms I.3.7 [computer graphics]: Three-Dimensional graphics and Realism–Color shading shadowing and texture I.4.3 [Image Processing and computer Vision]: Enhancement–Filtering J.4 [Social and Behavioral Sciences]: Psychology

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