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Manufacturing Layered Attenuators for Multiple Prescribed Shadow Images

COMPUTER GRAPHICS FORUM 2012年第2期31卷 603-610页

作者： Baran, Ilya Keller, Philipp Bradley, Derek Coros, Stelian Jarosz, Wojciech Nowrouzezahrai, Derek Gross, Markus Disney Res Zurich Zurich Switzerland ETH Zurich Switzerland

We present a practical and inexpensive method for creating physical objects that cast different color shadow images when illuminated by prescribed lighting configurations. The input to our system is a number of lighting configurations and corresponding desired shadow images. Our approach computes attenuation masks, which are then printed on transparent materials and stacked to form a single multi-layer attenuator. When illuminated with the input lighting configurations, this multi-layer attenuator casts the prescribed color shadow images. Alternatively, our method can compute layers so that their permutations produce different prescribed shadow images under fixed lighting. Each multi-layer attenuator is quick and inexpensive to produce, can generate multiple full-color shadows, and can be designed to respond to different types of natural or synthetic lighting setups. We illustrate the effectiveness of our multi-layer attenuators in simulation and in reality, with the sun as a light source.

关键词： I.3.3 [Computer Graphics]: Picture/Image Generation&mdash display algorithms I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism&mdash Color shading shadowing and texture I.4.0 [Image Processing and Computer Vision]: General&mdash Image displays

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Regularizing Image Reconstruction for Gradient-Domain Rendering with Feature Patches

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COMPUTER GRAPHICS FORUM 2016年第2期35卷 263-273页

作者： Manzi, M. Vicini, D. Zwicker, M. Univ Bern CH-3012 Bern Switzerland

We present a novel algorithm to reconstruct high-quality images from sampled pixels and gradients in gradient-domain Rendering. Our approach extends screened Poisson reconstruction by adding additional regularization constraints. Our key idea is to exploit local patches in feature images, which contain per-pixels normals, textures, position, etc., to formulate these constraints. We describe a GPU implementation of our approach that runs on the order of seconds on megapixel images. We demonstrate a significant improvement in image quality over screened Poisson reconstruction under the L-1 norm. Because we adapt the regularization constraints to the noise level in the input, our algorithm is consistent and converges to the ground truth.

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

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Jointly Optimized Regressors for Image Super-resolution

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COMPUTER GRAPHICS FORUM 2015年第2期34卷 95-104页

作者： Dai, D. Timofte, R. Van Gool, L. ETH Comp Vis Lab Zurich Switzerland

Learning regressors from low-resolution patches to high-resolution patches has shown promising results for image super-resolution. We observe that some regressors are better at dealing with certain cases, and others with different cases. In this paper, we jointly learn a collection of regressors, which collectively yield the smallest super-resolving error for all training data. After training, each training sample is associated with a label to indicate its 'best' regressor, the one yielding the smallest error. During testing, our method bases on the concept of 'adaptive selection' to select the most appropriate regressor for each input patch. We assume that similar patches can be super-resolved by the same regressor and use a fast, approximate kNN approach to transfer the labels of training patches to test patches. The method is conceptually simple and computationally efficient, yet very effective. Experiments on four datasets show that our method outperforms competing methods.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.3 [Computer Graphics]: Image Generation&mdash display algorithms I.4.3 [Image Processing and Computer Vision]: Enhancement&mdash Sharpening and deblurring

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Order-Independent Transparency for Programmable Deferred Shading Pipelines

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COMPUTER GRAPHICS FORUM 2015年第7期34卷 67-76页

作者： Schollmeyer, Andre Babanin, Andrey Froehlich, Bernd Bauhaus Univ Weimar Weimar Germany

In this paper, we present a flexible and efficient approach for the integration of order-independent transparency into a deferred shading pipeline. The intermediate buffers for storing fragments to be shaded are extended with a dynamic and memory-efficient storage for transparent fragments. The transparency of an object is not fixed and remains programmable until fragment processing, which allows for the implementation of advanced materials effects, interaction techniques or adaptive fade-outs. Traversing costs for shading the transparent fragments are greatly reduced by introducing a tile-based light-culling pass. During deferred shading, opaque and transparent fragments are shaded and composited in front-to-back order using the retrieved lighting information and a physically-based shading model. In addition, we discuss various configurations of the system and further enhancements. Our results show that the system performs at interactive frame rates even for complex scenarios.

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

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Stylized Caustics: Progressive Rendering of Animated Caustics

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COMPUTER GRAPHICS FORUM 2016年第2期35卷 243-252页

作者： Guenther, Tobias Rohmer, Kai Roessl, Christian Grosch, Thorsten Theisel, Holger Univ Magdeburg D-39106 Magdeburg Germany Tech Univ Clausthal Clausthal Zellerfeld Germany

In recent years, much work was devoted to the design of light editing methods such as relighting and light path editing. So far, little work addressed the target-based manipulation and animation of caustics, for instance to a differently-shaped caustic, text or an image. The aim of this work is the animation of caustics by blending towards a given target irradiance distribution. This enables an artist to coherently change appearance and style of caustics, e.g., for marketing applications and visual effects. Generating a smooth animation is nontrivial, as photon density and caustic structure may change significantly. Our method is based on the efficient solution of a discrete assignment problem that incorporates constraints appropriate to make intermediate blends plausibly resemble caustics. The algorithm generates temporally coherent results that are rendered with stochastic progressive photon mapping. We demonstrate our system in a number of scenes and show blends as well as a key frame animation.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.3 [Computer Graphics]: Three-Dimensional Graphics and Realism&mdash display algorithms I.3.3 [Computer Graphics]: Three-Dimensional Graphics and Realism&mdash Raytracing

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Interactive view-dependent rendering over networks

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IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS 2008年第3期14卷 576-589页

作者： Zheng, Zhi Prakash, Edmond Chan, Tony K. Y. Nanyang Technol Univ Singapore Singapore Microsoft Corp Redmond WA 98052 USA Manchester Metropolitan Univ Manchester M1 5GD Lancs England

For a client-server-based view-dependent rendering system, the overhead of view-dependent rendering and the network latency are major obstacles in achieving interactivity. In this paper, we first present a multiresolution hierarchy traversal management strategy to control the overhead of view-dependent rendering for low-capacity clients. Then, we propose a predictive parallel strategy to overcome the network latency for client-server-based view-dependent multiresolution rendering systems. Our solution is to make the client process and the server process run in parallel using the rendering time to cover the network latency. For networks with long round-trip times, we manage to overlap the network latency for one frame with the rendering time for multiple frames. View parameter prediction is incorporated to make the parallelism of the client and the server feasible. In order to maintain an acceptable view-dependent rendering quality in the network environment, we develop a synchronization mechanism and a dynamic adjustment mechanism to handle the transient network slowdowns and the changes in the network condition. Our experimental results, in comparison with the sequential method, show that our predictive parallel approach can achieve an interactive frame rate while keeping an acceptable rendering quality for large triangle models over networks with relatively long round-trip times.

关键词： display algorithms viewing algorithms graphics systems distributed/network graphics

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Geometry and Attribute Compression for Voxel Scenes

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COMPUTER GRAPHICS FORUM 2016年第2期35卷 397-407页

作者： Dado, Bas Kol, Timothy R. Bauszat, Pablo Thiery, Jean-Marc Eisemann, Elmar Delft Univ Technol NL-2600 AA Delft Netherlands

Voxel-based approaches are today's standard to encode volume data. Recently, directed acyclic graphs (DAGs) were successfully used for compressing sparse voxel scenes as well, but they are restricted to a single bit of (geometry) information per voxel. We present a method to compress arbitrary data, such as colors, normals, or reflectance information. By decoupling geometry and voxel data via a novel mapping scheme, we are able to apply the DAG principle to encode the topology, while using a palette-based compression for the voxel attributes, leading to a drastic memory reduction. Our method outperforms existing state-of-the-art techniques and is well-suited for GPU architectures. We achieve real-time performance on commodity hardware for colored scenes with up to 17 hierarchical levels (a 128K(3)voxel resolution), which are stored fully in core.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.3 [Computer Graphics]: Picture/Image Generation&mdash display algorithms I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism&mdash Raytracing

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Image and Video Abstraction by Coherence-Enhancing Filtering

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COMPUTER GRAPHICS FORUM 2011年第2期30卷 593-602页

作者： Kyprianidis, Jan Eric Kang, Henry Hasso Plattner Inst Potsdam Germany Univ Missouri St Louis MO 63121 USA

In this work, we present a non-photorealistic rendering technique to create stylized abstractions from color images and videos. Our approach is based on adaptive line integral convolution in combination with directional shock filtering. The smoothing process regularizes directional image features while the shock filter provides a sharpening effect. Both operations are guided by a flow field derived from the structure tensor. To obtain a high-quality flow field, we present a novel smoothing scheme for the structure tensor based on Poisson's equation. Our approach effectively regularizes anisotropic image regions while preserving the overall image structure and achieving a consistent level of abstraction. Moreover, it is suitable for per-frame filtering of video and can be efficiently implemented to process content in real-time.

关键词： 1.3.3 [Computer Graphics]: Picture/Image Generation display algorithms

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Efficient Variational Light Field View Synthesis For Making Stereoscopic 3D Images

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COMPUTER GRAPHICS FORUM 2015年第7期34卷 183-191页

作者： Zhang, Lei Zhang, Yu-Hang Huang, Hua Beijing Inst Technol Sch Comp Sci Beijing Key Lab Intelligent Informat Technol Beijing Peoples R China

We present a novel approach for making stereoscopic images by variational view synthesis on the multi-perspective light field. With the intended disparities as constraints, we specialize the generative variational model by incorporating per-pixel viewpoint assignment to synthesize the stereo pair. Also, we improve the variational solution by use of explicit weighted average on the light field. Our algorithm is able to handle arbitrary disparity remapping, thus enabling more flexible disparity control for the desired stereoscopic effect. The experiments demonstrate the effectiveness and efficiency for making the stereoscopic 3D images based on the light field.

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

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A structure-based approach for multimedia information filtering

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MULTIMEDIA TOOLS AND APPLICATIONS 2006年第1期29卷 73-89页

作者： Wang, Dianhui Huang, Xiaodi Kim, Yong-Soo Lim, Joon Shik Han, Myung-Mook Lee, Byung-Wook La Trobe Univ Dept Comp Sci & Comp Engn Melbourne Vic 3086 Australia Univ New England Sch Math Stat & Comp Sci Armidale NSW 2351 Australia Kyungwon Univ Software Coll Songnam 405760 Gyeonggi Do South Korea

While multimedia documents are sequentially presented to users, an information filtering (IF) system is useful to achieve a good retrieval performance in terms of both quality and efficiency. Conventional approaches for designing an IF system are based on the user's evaluation on information relevance degree (IRD), but ignore other attributes in system design such as relative importance of the data in a collection of multimedia documents. In this paper, we aim at developing a framework of designing structure-based multimedia IF systems, which incorporates the characteristics of the importance and relevance of multimedia documents. A method of calculating the values of relative importance degree of multimedia documents is proposed, Furthermore, these values are combined into the IRD of multimedia documents to improve the representation of user profiles. An illustrative example is given to demonstrate the proposed techniques.

关键词： multimedia documents display algorithms search and retrieval information filtering

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