检索结果-内蒙古大学图书馆

Pacific (formerly Asia-Pacific APVIS) visualization Symposium

作者： Sathish Kottravel Martin Falk Erik Sundén Timo Ropinski Interactive Visualization Group Linköping University Sweden Visual Computing Research Group Ulm University Germany

In this paper, we introduce coverage-based opacity estimation to achieve Depth of Field (DoF) effects when visualizing molecular dynamics (MD) data. The proposed algorithm is a novel object-based approach which eliminates many of the shortcomings of state-of-the-art image-based DoF algorithms. Based on observations derived from a physically-correct reference renderer, coverage-based opacity estimation exploits semi-transparency to simulate the blur inherent to DoF effects. It achieves high quality DoF effects, by augmenting each atom with a semi-transparent shell, which has a radius proportional to the distance from the focal plane of the camera. Thus, each shell represents an additional coverage area whose opacity varies radially, based on our observations derived from the results of multi-sampling DoF algorithms. By using the proposed technique, it becomes possible to generate high quality visual results, comparable to those achieved through ground-truth multi-sampling algorithms. At the same time, we obtain a significant speedup which is essential for visualizing MD data as it enables interactive rendering. In this paper, we derive the underlying theory, introduce coverage-based opacity estimation and demonstrate how it can be applied to real world MD data in order to achieve DoF effects. We further analyze the achieved results with respect to performance as well as quality and show that they are comparable to images generated with modern distributed ray tracing engines.

关键词： Lenses Apertures Atomic measurements Rendering (computer graphics) Cameras Estimation Data visualization

来源：评论

学校读者我要写书评

暂无评论

Efficient volume illumination with multiple light sources through selective light updates

Efficient volume illumination with multiple light sources th...

引用

Pacific (formerly Asia-Pacific APVIS) visualization Symposium

作者： Erik Sundén Timo Ropinski Interactive Visualization Group Linköping University Sweden Visual Computing Research Group Ulm University Germany

Incorporating volumetric illumination into rendering of volumetric data increases visual realism, which can lead to improved spatial comprehension. It is known that spatial comprehension can be further improved by incorporating multiple light sources. However, many volumetric illumination algorithms have severe drawbacks when dealing with multiple light sources. These drawbacks are mainly high performance penalties and memory usage, which can be tackled with specialized data structures or data under sampling. In contrast, in this paper we present a method which enables volumetric illumination with multiple light sources without requiring precomputation or impacting visual quality. To achieve this goal, we introduce selective light updates which minimize the required computations when light settings are changed. We will discuss and analyze the novel concepts underlying selective light updates, and demonstrate them when applied to real-world data under different light settings.

关键词： Light sources Lighting Rendering (computer graphics) visualization Solid modeling Photography Color

来源：评论

学校读者我要写书评

暂无评论

Photon parameterisation for robust relaxation constraints

Photon parameterisation for robust relaxation constraints

引用

34th Annual Conference on European Association for Computer Graphics, EUROGRAPHICS 2013

作者： Spencer, B. Jones, M.W. Visual and Interactive Computing Group Swansea University United Kingdom

This paper presents a novel approach to detecting and preserving fine illumination structure within photon maps. Data derived from each photon's primal trajectory is encoded and used to build a high-dimensional kd-tree. Incorporation of these new parameters allows for precise differentiation between intersecting ray envelopes, thus minimizing detail degradation when combined with photon relaxation. We demonstrate how parameter-aware querying is beneficial in both detecting and removing noise. We also propose a more robust structure descriptor based on principal components analysis that better identifies anisotropic detail at the sub-kernel level. We illustrate the effectiveness of our approach in several example scenes and show significant improvements when rendering complex caustics compared to previous methods. © 2013 The Eurographics Association and Blackwell Publishing Ltd.

关键词： Photons

来源：评论

学校读者我要写书评

暂无评论

Seeing through the blur

Seeing through the blur

引用

Conference on Computer Vision and Pattern Recognition (CVPR)

作者： Hossein Mobahi C. Lawrence Zitnick Yi Ma CS Department University of Illinois Urbana-Champaign Urbana IL USA Interactive Visual Media Group Microsoft Research Redmond WA USA ECE Department University of Illinois Urbana-Champaign Urbana IL USA Visual Computing Group Microsoft Research Asia Beijing China

This paper addresses the problem of image alignment using direct intensity-based methods for affine and homography transformations. Direct methods often employ scale-space smoothing (Gaussian blur) of the images to avoid local minima. Although, it is known that the isotropic blur used is not optimal for some motion models, the correct blur kernels have not been rigorously derived for motion models beyond translations. In this work, we derive blur kernels that result from smoothing the alignment objective function for some common motion models such as affine and homography. We show the derived kernels remove poor local minima and reach lower energy solutions in practice.

关键词： Kernel Smoothing methods Optimization Convolution Transforms visualization Computer vision

来源：评论

学校读者我要写书评

暂无评论

Efficient Volumetric Anisotropic Diffusion Computation on GPUs

引用

PAMM 2012年第1期12卷

作者： Arjan Kuijper Andreas Schwarzkopf Thomas Kalbe Michael Goesele Fraunhofer IGD - Institute for applied research in Visual Computing Darmstadt Germany Interactive Graphics Systems Group Technische Universität Darmstadt Germany

We present an efficient implementation of volumetric anisotropic image diffusion on modern programmable graphics processing units (GPUs). We avoid the computational bottleneck of a time consuming eigenvalue decomposition in ℝ 3 . Instead, we use a projection of the Hessian matrix along the surface normal onto the tangent plane of the local isodensity surface and solve for the remaining two tangent space eigenvectors. We derive closed formulas to achieve this resulting in efficient GPU code. Our most complex volumetric anisotropic diffusion gains a speed up of more than 600 compared to a CPU solution [1]. (© 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)

关键词：

来源：评论

学校读者我要写书评

暂无评论

Bob's project guidelines: Writing a dissertation for a BSc. in computer science

ITALICS Innovations in Teaching and Learning in Information ...

引用

ITALICS Innovations in Teaching and Learning in Information and Computer Sciences 2011年第1期10卷 43-54页

作者： Laramee, Robert S. Visual and Interactive Computing Group Computer Science Department Swansea University United Kingdom

These detailed guidelines attempt to explain the mechanics of writing a third year project dissertation in Computer Science. They serve as a useful starting point for students (and new advisers) in their third or fourth year of study in the Computer Science Department of a UK-based university. Afterall, no one is born knowing how to write a dissertation. Yet, there are certain elements, a commonality, that can be found in virtually all good dissertations. We give our recommendations as to each section a good dissertation consists of as well as what each section contains. These guidelines are generic and can be customized to fit most projects. The guidelines are open and free to use at any university or institution without permission. We believe that the writing can start with the abstract, however, in practice writing usually starts with the background section. The abstract can be approximately 6-12 sentences. It is a difficult starting point, but it forces the author to write down a concise description of what it is they're researching and what the benefits are. Chances are, if the author can't write an abstract, then it is not clear in the author's mind what the project is about. Of course the abstract will be refined and updated over the lifetime of the project. The abstract can concisely (1) identify the project topic, (2) identify the benefits and advantages that result (3) and if there is novelty, describe the novelty of the presented work. If there's a description of the project in a previously existing project selection brochure then that can be used as a basis for an abstract. These guidelines are a starting point only and are not a substitute for an advisor.

关键词： Computer science

来源：评论

学校读者我要写书评

暂无评论

ZAPP - A management framework for distributed visualization systems

ZAPP - A management framework for distributed visualization ...

引用

IADIS International Conference Computer Graphics, visualization, Computer Vision and Image Processing 2011, Part of the IADIS Multi Conference on Computer Science and Information Systems 2011, MCCSIS 2011

作者： Tamm, Georg Schiewe, Alexander Krüger, Jens Interactive Visualization and Data Analysis Group DFKI Saarbrücken Germany Intel Visual Computing Institute Saarbrücken Germany SCI Institute Salt Lake City United States

ISBN: (纸本)9789728939489

In this work we present the ZAPP, a management framework for distributed visualization systems. The main purpose of ZAPP is to improve the user, administrator, and developer experience in dealing with distributed displays. Even a single user with no administrative knowledge can operate a ZAPP-managed display system. The goal is that practically anyone is capable of operating the display with less than two minutes of training. To achieve this we present a lightweight management framework that links and controls the render workstations, which drive the displays, but also connects to the user's very own mobile devices, such as smartphones or tablets, to enable convenient control over the display. Consequently, the users never need to leave their familiar hardware and operating system environments and can use distributed displays without external help. © 2011 IADIS.

关键词： Display devices

来源：评论

学校读者我要写书评

暂无评论

Bob’s Project Guidelines: Writing a Dissertation for a BSc. in Computer Science

引用

Innovation in Teaching and Learning in Information and Computer Sciences 2011年第1期10卷

作者： Robert S Laramee Visual and Interactive Computing Group Computer Science Department Swansea University UK r.s.laramee@swansea.ac.u

These detailed guidelines attempt to explain the mechanics of writing a third year project dissertation in Computer Science. They serve as a useful starting point for students (and new advisers) in their third or fourth year of study in the Computer Science Department of a UK-based university. Afterall, no one is born knowing how to write a dissertation. Yet, there are certain elements, a commonality, that can be found in virtually all good dissertations. We give our recommendations as to each section a good dissertation consists of as well as what each section contains. These guidelines are generic and can be customized to fit most projects. The guidelines are open and free to use at any university or institution without *** believe that the writing can start with the abstract, however, in practice writing usually starts with the background section. The abstract can be approximately 6–12 sentences. It is a difficult starting point, but it forces the author to write down a concise description of what it is they’re researching and what the benefits are. Chances are, if the author can’t write an abstract, then it is not clear in the author’s mind what the project is about. Of course the abstract will be refined and updated over the lifetime of the project. The abstract can concisely (1) identify the project topic, (2) identify the benefits and advantages that result (3) and if there is novelty, describe the novelty of the presented work. If there’s a description of the project in a previously existing project selection brochure then that can be used as a basis for an abstract. These guidelines are a starting point only and are not a substitute for an advisor.

关键词： project guidelines computer science

来源：评论

学校读者我要写书评

暂无评论

Dual Range Deringing for non-blind image deconvolution

Dual Range Deringing for non-blind image deconvolution

引用

IEEE International Conference on Image Processing

作者： Le Zou Howard Zhou Samuel Cheng Chuan He Visual Computing Group Intel Corporation China School of Interactive Computing Georgia Institute of Technology USA School of Electrical and Computer Engineering University of Oklahoma USA Institute of Oil and Gas Peking University China

The popular Richardson-Lucy (RL) image deconvolution algorithm often produces undesirable ringing artifacts. In this paper, we propose a novel Dual Range Deringing (DRD) algorithm to address this problem. As a post-deconvolution scheme, the proposed approach follows RL deconvolution and removes ringing artifacts by utilizing information from both the input blurred image and the RL-deblurred image. DRD first marks smooth regions in the input blurred image that are likely to be subjected to ringing artifacts far away from any strong edge. It then identifies short-range ringing artifacts from the regions that surround strong edges in the RL-deblurred image. Once marked, both long- and short-range ringing artifacts are then suppressed by an edge-preserving deringing filter. We demonstrate the effectiveness of this procedure by performing experiments on a set of images blurred with various Point Spread Functions (PSFs). We compare DRD with state-of-the-art non-blind deconvolution algorithms and show that our results are virtually free of ringing artifacts with only minor detail losses. Moreover, DRD consists of computationally efficient local operations and is suitable for parallelization on modern GPUs.

关键词： Deconvolution Image edge detection Kernel Pixel Image restoration Graphics Noise

来源：评论

学校读者我要写书评

暂无评论

Into the blue: Better caustics through photon relaxation

Into the blue: Better caustics through photon relaxation

引用

30th Annual Conference on European Association for Computer Graphics, EUROGRAPHICS 2009

作者： Spencer, B. Jones, M.W. Visual and Interactive Computing Group Swansea University United Kingdom

The photon mapping method is one of the most popular algorithms employed in computer graphics today. However, obtaining good results is dependent on several variables including kernel shape and bandwidth, as well as the properties of the initial photon distribution. While the photon density estimation problem has been the target of extensive research, most algorithms focus on new methods of optimising the kernel to minimise noise and bias. In this paper we break from convention and propose a new approach that directly redistributes the underlying photons. We show that by relaxing the initial distribution into one with a blue noise spectral signature we can dramatically reduce background noise, particularly in areas of uniform illumination. In addition, we propose an efficient heuristic to detect and preserve features and discontinuities. We then go on to demonstrate how reconfiguration also permits the use of very low bandwidth kernels, greatly improving render times whilst reducing bias. © 2008 The Author(s).

关键词： Photons

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：