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54th IEEE International Midwest symposium on Circuits and Systems (MWSCAS)

作者： Liu, Bing Wei, Jizeng Shi, Shaofei Chang, Yisong Guo, Wei Tianjin Univ Sch Comp Sci & Technol Tianjin 300072 Peoples R China

ISBN: (纸本)9781612848570

Depth image Based Rendering (DIBR) is the most popular method to generate stereoscopic images. In this paper, a novel pixel-level full-pipelined hardware accelerator is presented. The proposed architecture with division elimination algorithm and cache window design can achieve real-time rendering speed with low cost. The hardware design is implemented and verified on FPGA platform. The result shows the design can be applied to handheld devices due to its high efficiency.

关键词： computer architecture FPGA cache storage cache window design depth image based rendering division elimination algorithm field programmable gate arrays pixel-level full-pipelined hardware accelerator rendering (computer graphics) stereo image processing stereoscopic image generation

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Multi-camera calibration based on an invariant pattern

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computerS & graphics-UK 2011年第2期35卷 198-207页

作者： Loaiza, Manuel E. Raposo, Alberto B. Gattass, Marcelo Pontifical Catholic Univ Rio de Janeiro Dept Informat Tecgraf Comp Graph Technol Grp Rio De Janeiro Brazil

In this paper we present a method for the calibration of multiple cameras based on the extraction and use of the physical characteristics of a one-dimensional invariant pattern which is defined by four collinear markers. The advantages of this kind of pattern stand out in two key steps of the calibration process. In the initial step of camera calibration methods, related to sample points capture, the proposed method takes advantage of using a new technique for the capture and recognition of a robust sample of projective invariant patterns, which allows to capture simultaneously more than one invariant pattern in the tracking area and recognize each pattern individually as well as each marker that composes them. This process is executed in real time while capturing our sample of calibration points in the cameras of our system. This new feature allows to capture a more numerous and robust set of sample points than other patterns used for multi-camera calibration methods. In the last step of the calibration process, related to camera parameters' optimization, we explore the collinearity feature of the invariant pattern and add this feature in the camera parameters optimization model. This approach obtains better results in the computation of camera parameters. We present the results obtained with the calibration of two multi-camera systems using the proposed method and compare them with other methods from the literature. (C) 2010 Elsevier Ltd. All rights reserved.

关键词： processing image Structure from motion Camera calibration Projective invariant patterns computer vision

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Interactive Visualization Technique for Truthful Color Reproduction in Spatial Augmented Reality Applications

Interactive Visualization Technique for Truthful Color Repro...

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10th IEEE/ACM International symposium on Mixed and Augmented Reality (ISMAR)

作者： Menk, Christoffer Koch, Reinhard Volkswagen Grp Res Wolfsburg Germany Univ Kiel Inst Comp Sci Kiel Germany

ISBN: (纸本)9781457721854

Spatial augmented reality is especially interesting for the design process of a car, because a lot of virtual content and corresponding real objects are used. One important issue in such a process is that the designer can trust the visualized colors on the real object, because design decisions are made on basis of the projection. In this article, we present an interactive visualization technique which is able to exactly compute the RGB values for the projected image, so that the resulting colors on the real object are equally perceived as the real desired colors. Our approach computes the influences of the ambient light, the material, the pose and the color model of the projector to the resulting colors of the projected RGB values by using a physically-based computation. This information allows us to compute the adjustment for the RGB values for varying projector positions at interactive rates. Since the amount of projectable colors does not only depend on the material and the ambient light, but also on the pose of the projector, our method can be used to interactively adjust the range of projectable colors by moving the projector to arbitrary positions around the real object. The proposed method is evaluated in a number of experiments.

关键词： Dynamic range Equations I.3.3 [computer graphics]: Picture/image Generation I.4.8 [image processing and computer Vision]: Scene Analysis I.4.9 [image processing and computer Vision]: Applications image color analysis Materials RGB value Table lookup Three

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Accelerating Tetrahedral Interpolation with Data-Level and Thread-Level Parallel Optimization

Accelerating Tetrahedral Interpolation with Data-Level and T...

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10th International symposium on Signals, Circuits and Systems (ISSCS)

作者： Ahn, Jaewoo Seong, Becksang Sung, Wonyong Seoul Natl Univ Sch Elect Engn Seoul 151742 South Korea

ISBN: (纸本)9781457702013

The tetrahedral interpolation method for color space conversion consumes the longest time in the entire color management process. This makes it difficult to implement a purely software-based high-end image processing system. In this study, SIMD (Single Instruction Multiple Data) and GPGPU (General Purpose graphics processing Unit) based optimizations for tetrahedral interpolation are implemented. To exploit DLP (Data-Level Parallelism) with SIMD extensions, the program is restructured and conditional branches are removed so that inter-pixel parallelism is used for tetrahedron determination, while inter-output-channel parallelism is employed for the table lookup and weighted sum. TLP (Thread-Level Parallelism) is exploited with GPGPU by allocating different input pixels to each thread. Memory access cycle is minimized using constant memory for color lookup table. We conclude that both DLP and TLP optimization is essential for recent multi-core CPUs with wider SIMD registers and reducing the communication overhead between the host and the device is critical for TLP optimization with GPGPUs.

关键词： DLP GPGPU image color analysis Indexes Instruction sets Interpolation Optimization Parallel processing Pixel SIMD accelerating tetrahedral interpolation color management process color space conversion computer graphic equipment coprocessors data level parallel optimization data level parallelism general purpose graphics processing unit image processing system inter output channel parallelism interpixel parallelism interpolation memory access cycle optimisation parallel processing single instruction multiple data table lookup table lookup thread level parallel optimization

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Realistic and Interactive image-based Rendering of Ancient Chinese Artifacts using A Multiple Camera Array

Realistic and Interactive Image-based Rendering of Ancient C...

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IEEE International symposium on Circuits and Systems (ISCAS)

作者： Wang, C. Zhu, Z. Y. Chan, S. C. Shum, H. Y. Univ Hong Kong Dept Elect & Elect Engn Hong Kong Hong Kong Peoples R China Microsoft Corp Redmond WA USA

ISBN: (纸本)9781424494743

This paper proposes a system for photorealistic interactive rendering of ancient Chinese artifacts for cultural heritage preservation using multiview images captured by a circular multiple-camera array. It employs 3D reconstruction and precomputed shadow field techniques to enable real-time relighting and object interaction. Moreover, Gabor features are employed to improve the robustness of line matching along epipolar lines and robust radial basis function modeling is employed to suppress possible outliers arising from false matching. Using the 3D model reconstructed, the precomputed shadow field is employed to provide real-time rendering/relighting and object movement, after acceleration on a graphic processing unit (GPU). Excellent rendering results are obtained and the ancient Chinese artifacts can be displayed in modern multi-view displays and conventional stereo systems.

关键词： Cameras Computational modeling graphics processing unit image reconstruction Real time systems Rendering (computer graphics) Three dimensional displays

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High level computer vision using OpenCV

High level computer vision using OpenCV

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24th SIBGRAPI Conference on graphics, Patterns, and images Tutorials, SIBGRAPI-T 2011

作者： Marengoni, Maurício Stringhini, Denise Faculdade de Computação e Informática Universidade Presbiteriana Mackenzie São Paulo Brazil

ISBN: (纸本)9780769545493

This paper presents some more advanced topics in image processing and computer vision, such as Principal Components Analysis, Matching Techniques, Machine Learning Techniques, Tracking and Optical Flow and Parallel computer Vision using CUDA. These concepts will be presented using the open CV library, which is a free computer vision library for C/C++ programmers available for Windows, Linux Mac OS and Android platforms. These topics will be covered considering not only theoretical aspects but practical examples will be presented in order to understand how and when to use each of them. © 2011 IEEE.

关键词： computer vision

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Iconizer: A Framework to Identify and Create Effective Representations for Visual Information Encoding

Iconizer: A Framework to Identify and Create Effective Repre...

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11th International symposium on Smart graphics

作者： Garg, Supriya Berg, Tamara Mueller, Klaus SUNY Stony Brook Dept Comp Sci Stony Brook NY USA

ISBN: (纸本)9783642225703

The majority of visual communication today occurs by ways of spatial groupings, plots, graphs. data renderings, photographs and video frames. However, the degree of semantics encoded in these visual representations is still quite limited. The use of icons as a form of information encoding has been explored to a much lesser extent. In this paper we describe a framework that uses a dual domain approach involving natural language text processing and global image databases to help users identify icons suitable to visually encode abstract semantic concepts.

关键词： human-computer interaction non-photorealistic rendering

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Adessowiki: Collaborative scientific programming environment

Adessowiki: Collaborative scientific programming environment

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24th SIBGRAPI Conference on graphics, Patterns, and images Tutorials, SIBGRAPI-T 2011

作者： Rittner, Leticia Saúde, André V. Silva, Alexandre G. Machado, Rubens C. Bento, Mariana P. Lotufo, Roberto A. School of Electrical and Computer Engineering State University of Campinas Campinas Brazil Federal University of Lavras Brazil Santa Catarina State University Brazil Center for Information Technology Renato Archer Campinas Brazil

ISBN: (纸本)9780769545493

Adessowiki is a collaborative environment for teaching and research in image processing. Adessowiki is composed of a collection of collaborative web pages in the form of a wiki. The articles of this wiki can embed programming code that will be executed on the server when the page is rendered, incorporating the results as figures, texts and tables on the document. The integrated collaborative environment of Adessowiki, containing documentation, programming code and execution results is able to create several possibilities of applications. This paper presents some of the applications where Adessowiki has been used, such as Scientific Writing and Virtual Learning Environment. © 2011 IEEE.

关键词： image processing

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Parallel automatic registration of large scale microscopic images on multiprocessor CPUs and GPUs

Parallel automatic registration of large scale microscopic i...

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25th IEEE International Parallel and Distributed processing symposium, Workshops and Phd Forum, IPDPSW 2011

作者： Lee, Cooper Huang, Kun Ujaldon, Manuel Center for Comprehensive Informatics Emory University Atlanta GA United States Biomedical Informatics Department Ohio State University Columbus OH United States Computer Architecture Department University of Malaga Malaga Spain

ISBN: (纸本)9780769543857

During the present decade, emerging architectures like multicore CPUs and graphics processing units (GPUs) have steadily gained popularity for their ability to deploy high computational power at a low cost. In this paper, we combine parallelization techniques on a cooperative cluster of multicore CPUs and multisocket GPUs to apply their joint computational power to an automatic image registration algorithm intended for the analysis of high-resolution microscope images. Registration methods pose a computational challenge within the biomedical field due to the large size of microscope image data sets, which typically extend to the Terabyte scale. We analyze this application to identify those parts which are more favorable to the CPU and GPU execution models and decompose the process accordingly. Performance results are presented for two sets of images: mouse placenta (16K × 16K pixels) and mouse mammary tumor (23K × 62K pixels). Execution times are shown on different multi-node, multi-socket and multi-core configurations to provide performance insights about the most effective approach. © 2011 IEEE.

关键词： graphics processing unit

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Frameworks for GPU Accelerators: A comprehensive evaluation using 2D/3D image registration

Frameworks for GPU Accelerators: A comprehensive evaluation ...

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IEEE symposium on Application Specific Processors

作者： Membarth, Richard Hannig, Frank Teich, Jurgen Korner, Mario Eckert, Wieland Department of Computer Science University of Erlangen-Nuremberg Germany Siemens Healthcare Sector Forchheim Germany

ISBN: (纸本)9781457712111

In the last decade, there has been a dramatic growth in research and development of massively parallel many-core architectures like graphics hardware, both in academia and industry. This changed also the way programs are written in order to leverage the processing power of a multitude of cores on the same hardware. In the beginning, programmers had to use special graphics programming interfaces to express general purpose computations on graphics hardware. Today, several frameworks exist to relieve the programmer from such tasks. In this paper, we present five frameworks for parallelization on GPU Accelerators, namely RapidMind, PGI Accelerator, HMPP Workbench, OpenCL, and CUDA. To evaluate these frameworks, a real world application from medical imaging is investigated, the 2D/3D image registration. © 2011 IEEE.

关键词： Medical imaging

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