Eurographics Symposium on Rendering最新文献_第8页

Real-time multiple scattering in participating media with illumination networks 光照网络参与介质中的实时多重散射

Eurographics Symposium on Rendering Pub Date : 2005-06-29 DOI: 10.2312/EGWR/EGSR05/277-282

László Szirmay-Kalos, M. Sbert, Tamás Umenhoffer

引用次数: 31

Fast exact from-region visibility in urban scenes 在城市场景中快速精确的区域可见性

Eurographics Symposium on Rendering Pub Date : 2005-06-29 DOI: 10.2312/EGWR/EGSR05/223-230

Jiří Bittner, Peter Wonka, M. Wimmer

引用次数: 25

A hybrid monte carlo method for accurate and efficient subsurface scattering 一种混合蒙特卡罗方法用于精确和高效的地下散射

Eurographics Symposium on Rendering Pub Date : 2005-06-29 DOI: 10.2312/EGWR/EGSR05/283-290

Hongsong Li, F. Pellacini, K. Torrance

{"title":"A hybrid monte carlo method for accurate and efficient subsurface scattering","authors":"Hongsong Li, F. Pellacini, K. Torrance","doi":"10.2312/EGWR/EGSR05/283-290","DOIUrl":"https://doi.org/10.2312/EGWR/EGSR05/283-290","url":null,"abstract":"Subsurface scattering is a fundamental aspect of surface appearance responsible for the characteristic look of many materials. Monte Carlo path tracing techniques can be employed with high accuracy to simulate the scattering of light inside a translucent object, albeit at the cost of long computation times. In a seminal work, Jensen et al. [JMLH01] presented a more efficient technique to simulate subsurface scattering that, while producing accurate results for translucent, optically-thick, materials, exhibits artifacts for semi-transparent, optically-thin, ones, especially in regions of high-curvature.\u0000 This paper presents a hybrid Monte Carlo technique capable of simulating a wide range of materials exhibiting subsurface scattering, from translucent to semi-transparent ones, with an accuracy comparable to Monte Carlo techniques but at a much lower computational cost. Our approach utilizes a Monte Carlo path tracing approach for the first several scattering events, in order to estimate the directional-diffuse component of subsurface scattering, and switches to a dipole diffusion approximation only when the path penetrates deeply enough into the surface. By combining the accuracy of Monte Carlo integration with the efficiency of the dipole diffusion approximation, our hybrid method produces results as accurate as full Monte Carlo simulations at a speed comparable to the Jensen et al. approximation, thus extending its usefulness to a much wider range of materials.","PeriodicalId":363391,"journal":{"name":"Eurographics Symposium on Rendering","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130415444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 33

Table-top computed lighting for practical digital photography 桌面计算照明实用数码摄影

Eurographics Symposium on Rendering Pub Date : 2005-06-29 DOI: 10.2312/EGWR/EGSR05/165-172

Ankit Mohan, J. Tumblin, Bobby Bodenheimer, C. Grimm, Reynold J. Bailey

引用次数: 19

Experimental analysis of BRDF models BRDF模型的实验分析

Eurographics Symposium on Rendering Pub Date : 2005-06-29 DOI: 10.2312/EGWR/EGSR05/117-126

A. Ngan, F. Durand, W. Matusik

{"title":"Experimental analysis of BRDF models","authors":"A. Ngan, F. Durand, W. Matusik","doi":"10.2312/EGWR/EGSR05/117-126","DOIUrl":"https://doi.org/10.2312/EGWR/EGSR05/117-126","url":null,"abstract":"The Bidirectional Reflectance Distribution Function (BRDF) describes the appearance of a material by its interaction with light at a surface point. A variety of analytical models have been proposed to represent BRDFs. However, analysis of these models has been scarce due to the lack of high-resolution measured data. In this work we evaluate several well-known analytical models in terms of their ability to fit measured BRDFs. We use an existing high-resolution data set of a hundred isotropic materials and compute the best approximation for each analytical model. Furthermore, we have built a new setup for efficient acquisition of anisotropic BRDFs, which allows us to acquire anisotropic materials at high resolution. We have measured four samples of anisotropic materials (brushed aluminum, velvet, and two satins). Based on the numerical errors, function plots, and rendered images we provide insights into the performance of the various models. We conclude that for most isotropic materials physically-based analytic reflectance models can represent their appearance quite well. We illustrate the important difference between the two common ways of defining the specular lobe: around the mirror direction and with respect to the half-vector. Our evaluation shows that the latter gives a more accurate shape for the reflection lobe. Our analysis of anisotropic materials indicates current parametric reflectance models cannot represent their appearances faithfully in many cases. We show that using a sampled microfacet distribution computed from measurements improves the fit and qualitatively reproduces the measurements.","PeriodicalId":363391,"journal":{"name":"Eurographics Symposium on Rendering","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128030048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 509

Ray maps for global illumination 用于全局照明的光线贴图

Eurographics Symposium on Rendering Pub Date : 2005-06-29 DOI: 10.2312/EGWR/EGSR05/043-054

V. Havran, Jiří Bittner, R. Herzog, H. Seidel

引用次数: 16

Estimation of 3D faces and illumination from single photographs using a bilinear illumination model 利用双线性光照模型估计单张照片的三维人脸和光照

Eurographics Symposium on Rendering Pub Date : 2005-06-29 DOI: 10.2312/EGWR/EGSR05/073-082

Jinho Lee, Hanspeter Pfister, B. Moghaddam, R. Machiraju

{"title":"Estimation of 3D faces and illumination from single photographs using a bilinear illumination model","authors":"Jinho Lee, Hanspeter Pfister, B. Moghaddam, R. Machiraju","doi":"10.2312/EGWR/EGSR05/073-082","DOIUrl":"https://doi.org/10.2312/EGWR/EGSR05/073-082","url":null,"abstract":"3D Face modeling is still one of the biggest challenges in computer graphics. In this paper we present a novel framework that acquires the 3D shape, texture, pose and illumination of a face from a single photograph. Additionally, we show how we can recreate a face under varying illumination conditions. Or, essentially relight it. Using a custom-built face scanning system, we have collected 3D face scans and light reflection images of a large and diverse group of human subjects. We derive a morphable face model for 3D face shapes and accompanying textures by transforming the data into a linear vector sub-space. The acquired images of faces under variable illumination are then used to derive a bilinear illumination model that spans 3D face shape and illumination variations. Using both models we, in turn, propose a novel fitting framework that estimates the parameters of the morphable model given a single photograph. Our framework can deal with complex face reflectance and lighting environments in an efficient and robust manner. In the results section of our paper, we compare our methods to existing ones and demonstrate its efficacy in reconstructing 3D face models when provided with a single photograph. We also provide several examples of facial relighting (on 2D images) by performing adequate decomposition of the estimated illumination using our framework.","PeriodicalId":363391,"journal":{"name":"Eurographics Symposium on Rendering","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114616244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 20

Motion blur for textures by means of anisotropic filtering 通过各向异性滤波对纹理进行运动模糊

Eurographics Symposium on Rendering Pub Date : 2005-06-29 DOI: 10.2312/EGWR/EGSR05/105-110

J. Loviscach

引用次数: 24

Colorization by example 举例着色

Eurographics Symposium on Rendering Pub Date : 2005-06-29 DOI: 10.2312/EGWR/EGSR05/201-210

Revital Ironi, D. Cohen-Or, Dani Lischinski

{"title":"Colorization by example","authors":"Revital Ironi, D. Cohen-Or, Dani Lischinski","doi":"10.2312/EGWR/EGSR05/201-210","DOIUrl":"https://doi.org/10.2312/EGWR/EGSR05/201-210","url":null,"abstract":"We present a new method for colorizing grayscale images by transferring color from a segmented example image. Rather than relying on a series of independent pixel-level decisions, we develop a new strategy that attempts to account for the higher-level context of each pixel. The colorizations generated by our approach exhibit a much higher degree of spatial consistency, compared to previous automatic color transfer methods [WAM02]. We also demonstrate that our method requires considerably less manual effort than previous user-assisted colorization methods [LLW04].\u0000 Given a grayscale image to colorize, we first determine for each pixel which example segment it should learn its color from. This is done automatically using a robust supervised classification scheme that analyzes the low-level feature space defined by small neighborhoods of pixels in the example image. Next, each pixel is assigned a color from the appropriate region using a neighborhood matching metric, combined with spatial filtering for improved spatial coherence. Each color assignment is associated with a confidence value, and pixels with a sufficiently high confidence level are provided as \"micro-scribbles\" to the optimization-based colorization algorithm of Levin et al. [LLW04], which produces the final complete colorization of the image.","PeriodicalId":363391,"journal":{"name":"Eurographics Symposium on Rendering","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128299409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 351

Stippling and silhouettes rendering in geometry-image space 点画和轮廓绘制几何图像空间

Eurographics Symposium on Rendering Pub Date : 2005-06-29 DOI: 10.2312/EGWR/EGSR05/193-200

Xiaoru Yuan, Minh X. Nguyen, N. Zhang, Baoquan Chen

引用次数: 20