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检索条件"机构=Graphics and Image Processing Laboratory"

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Simplified simulation and visualization of tubular flows with approximate centerline generation

Simplified simulation and visualization of tubular flows wit...

引用

Annual IEEE Symposium on Computer-Based Medical Systems

作者： Tiago H. C. Nobrega Diego Dias Bispo Carvalho Aldo von Wangenheim LAPIX - Laboratory for Image Processing and Computer Graphics UFSC - Federal University of Santa Catarina Brazil LAPIX - Laboratory for Image Processing and Computer Graphics UFSC - Federal University of Santa Catarina Florianópolis Brazil

We present a method to efficiently simulate fluid flows through tubular structures such as pipes and blood vessels. The method relies on the structure's centerline and for that purpose we present an algorithm to generate an approximate centerline of a tubular structure defined by an ordinary polygonal mesh. As an additional benefit, this center-line provides approximations of measures about the tubular structure such as length of regions of interest and cross-section diameters. The fluid is simulated with the smoothed particle hydrodynamics method and the fluid-structure interaction is simplified to provide interactive rates. The particles can be colored according to physical quantities to better visualize the evolution of the fluid's state in narrow and otherwise obstructed areas.

关键词： Visualization Biomedical imaging Computational modeling Computer simulation Fluid flow Mesh generation Solid modeling Medical simulation Magnetic resonance imaging Computed tomography

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Fast registration of tabular document images using the Fourier-Mellin transform

Fast registration of tabular document images using the Fouri...

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International Workshop on Document image Analysis for Libraries

作者： L.A.D. Hutchison W.A. Barrett Graphics Vision and Image Processing Laboratory Brigham Young University Provo UT USA

A new technique is presented for quickly identifying global affine transformations applied to tabular document images, and to correct for those transformations. This technique, based on the Fourier-Mellin transform, is used to register (align) a set of tabular documents to each other. Each component of the affine transform is handled separately, which dramatically reduces the total parameter space of the problem. This method is robust, and deals with all components of the affine transform in a uniform way. The Fourier-Mellin transform is also extended to handle shear, which can approximate a small amount of perspective distortion, and to not need Blackman windowing for document images. In order to limit registration to foreground pixels only, and to eliminate Fourier "edge effects ", a novel, locally adaptive foreground-background segmentation algorithm is introduced, based on the median filter. An original method is also presented for automatically obtaining blank document templates from a set of registered document images. Finally, image registration is demonstrated as a tool for compression of document images which share the same template.

关键词： Fast Fourier transforms Data mining image registration Fourier transforms image processing graphics Robustness image segmentation Adaptive filters image coding

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Extraction of human body skeleton based on silhouette images

Extraction of human body skeleton based on silhouette images

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2nd International Workshop on Education Technology and Computer Science, ETCS 2010

作者： Ding, Jianhao Wang, Yigang Yu, Lingyun State Key Laboratory of CAD and CG Zhejiang University Hangzhou China Institute of Computer Graphics and Image Processing Hangzhou Dianzi University Hangzhou China Department of Mathematics and Computing Science University of Groningen Netherlands

ISBN: (纸本)9780769539874

Skeleton extraction is essential for general shape representation. A typical skeletonization algorithm should obtain the ability to preserve original object's topological and hierarchical properties. However, most of current methods are high memory cost, computationally intensive, and also require complex data structures. In this paper, we propose an efficient and accurate skeletonization method for the skeleton feature points extracted from human body based on silhouette images. First, the gradient of distance transform is used to detect critical points inside the foreground. Then, we converge and simplify critical points in order to generate the most important and elegant skeleton feature points. Finally, we present an algorithm which connects the skeleton feature points and estimates the position of skeleton joints. © 2010 IEEE.

关键词： Extraction

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Block-based normalized-cut algorithm for image segmentation

Block-based normalized-cut algorithm for image segmentation

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作者： Song, Haiyu Li, Xiongfei Wang, Pengjie Chen, Jingrun Key Laboratory of Symbol Computation and Knowledge Engineering Ministry of Education Jilin University Changchun China Institute of Computer Graphics and Image Processing Dalian Nationalities University Dalian China State Key Laboratory of CAD and CG Zhejiang University Hangzhou China

ISBN: (纸本)9783642051722

Automatic image segmentation remains a challenging problem in the fields of computer vision, image analysis and understanding. A lot of algorithms and technologies have been proposed and developed for image segmentation, among which the N-cut has been a promising method and active research area due to better quality. But the N-cut can't process medium and large image dataset online due to incredible memory and time complexity. Moreover, the N-cut algorithm can't utilize texture information since its basic unit of clustering algorithm is pixel. To overcome the drawback and improve the description power, the paper proposes a block-based N-cut algorithm for image segmentation, whose basic unit of clustering is image block instead of individual pixel. Block-based algorithm not only decreases the time and storage complexity, but also improves the discrimination power of visual feature vector. The experiments demonstrate that proposed algorithm outperform the original N-cut algorithm in efficiency. Experiments show that the proposed block-based N-cut algorithm is more suitable for online processing large-scale data. © 2010 Springer-Verlag Berlin Heidelberg.

关键词： image segmentation

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Keycap character detection model based on target classification 7

Keycap character detection model based on target classificat...

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2024 7th International Conference on Intelligent Manufacturing and Automation, IMA 2024

作者： Xiong, Taiping Zhu, Zhiguo Wang, Tinghao School of Computer and Information Security Guilin University of Electronic Technology Guangxi Guilin541004 China Key Laboratory of Image Graphics and Intelligent Processing in Guangxi Guilin University of Electronic Technology Guangxi Guilin541004 China

The production process of keycaps may result in surface character defects. The existing keycap character defect detection technology has low efficiency and accuracy, hindering the automation of keycap manufacturing. Addressing the challenge of extracting the entire keyboard from illuminated regions, this paper proposes a method using image feature points for template matching to extract the region of interest. Subsequently, leveraging prior knowledge, the paper addresses character segmentation and extraction on the keyboard. For character detection, the paper preprocesses images and classifies them by using an S-VGG network, yielding corresponding labels. © Published under licence by IOP Publishing Ltd.

关键词： Template matching

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Lossless Compression of Maps, Charts, and Graphs via Color Separation

Lossless Compression of Maps, Charts, and Graphs via Color S...

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Data Compression Conference (DCC)

作者： Saif alZahir Arber Borici Graphics and Image Processing Laboratory Computer Science University of Northern British Columbia BC Canada

ISBN: (纸本)9781424464258

Summary form only given. In this research, we present a fast and efficient lossless compression scheme for discrete-color digital map images, charts, and graphs stored in the raster image format. The proposed scheme determines the number of different colors in the given image and creates a separate bi-level data layer for each color. Then, the bi-level layers are individually compressed using the proposed algorithm. This scheme comprises two components: (i) a codebook; and (ii) our row-column reduction coding algorithm, RCRC. The codebook is a fixed-to-variable Huffman dictionary that is based on symbol entropy. The second component of our scheme is a new algorithm, the RCRC, designed to deal with those blocks that are not found in the codebook. Our experimental results show that our lossless compression scheme achieved an average compression equal to 0.035 bpp for map images and 0.03 bpp for charts and graphs. These results are better than most reported results in the literature. Moreover, our scheme is simple and fast.

关键词： image coding Frequency Data compression Color Computer graphics image processing Computer science Partitioning algorithms Dictionaries Entropy

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Virtual housing design experience platform

Virtual housing design experience platform

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International Conference on Multimedia Technology

作者： Dai, Dameng Ding, Jianhao Wang, Yigang College of Physics and Electronic Information and Engineering Wenzhou University Wenzhou China Institute of Computer Graphics and Image Processing Hangzhou Dianzi University Hangzhou China State Key Laboratory of CAD and CG Zhejiang University Hangzhou China

ISBN: (纸本)9781424478743

Traditional display fashions of housing design mainly depend on static pictures, which are short of the intuition of house space and do not support interaction during design periods. This paper proposes a virtual housing design experience platform consist of a cheap hardware VR environment and housing design software system we developed. With this design platform, a fast generating virtual house permits intuitive and precise interaction in the VR environment. Customers can modify the design of their home and have a pseudo experience of their virtual house in real time. The system will give advice on layout design, providing a complete and precise house space representation and the support for real time visualization. ©2010 IEEE.

关键词： Virtual reality

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Interactive Simulation and Visualization of Fluids with Surface Raycasting

Interactive Simulation and Visualization of Fluids with Surf...

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Brazilian Symposium on Computer graphics and image processing (SIBGRAPI)

作者： Renan Teston Inácio Tiago H. C. Nobrega Diego D. B. Carvalho Aldo von Wangenheim LAPIX - Laboratory for Image Processing and Computer Graphics Federal University of Santa Catarina Florianópolis Brazil

We present a method to couple particle-based fluid simulation methods such as Smoothed Particle Hydrodynamics (SPH) and volume rendering in order to visualize the fluid. A volume is generated from the fluid's implicit density field so volume raycasting can be performed to render the surface on the GPU. The volume generation algorithm is also implemented in the GPU and is suitable to be used with both SPH simulations implemented on CPU and GPU. We compare different implementations of fluid simulation, demonstrating the modularity of the volume generation method and concluding that it can be used together with other particle-based simulation models and other volume rendering techniques.

关键词： Solid modeling graphics processing unit Rendering (computer graphics) Sprites (computer) Mathematical model Fluids Visualization

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A Low Complexity Wavelet-Packets Based image Signature for Indexing and Retrieval

A Low Complexity Wavelet-Packets Based Image Signature for I...

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Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Saif Zahir Computer Science Department UNBC Image Processing Multimedia and Graphics Laboratory Prince George BC Canada

image signature is a signal that is significantly shorter and simpler than the image signal and can be used to efficiently identify the original image. Generating an image signature that accurately represents an image can only be done by means of extracting specific features of the image and express it in an efficient way. In this paper, a new wavelet-packets-based (WP) image signature that can be used for image indexing and fast retrieval is proposed. This signature is generated via encoding the position of specific points of the signal that represents some statistics of the wavelet packets coefficients in the various frequency bands. Computer simulation results using nearly 7500 image signatures show that the targeted image signature was identified with a very high accuracy in a very short period of time. Also, it showed that the proposed signature is robust against geometric transformation

关键词： Wavelet packets Indexing image retrieval Signal processing image generation Feature extraction Signal generators Encoding Statistics Frequency

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Parallel conflict-free optimal access to complete extended Q-ary trees 4th

Parallel conflict-free optimal access to complete extended Q...

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4th International Workshop on Parallel processing by Cellular Automata and Arrays, Parcella 1988

作者： Creutzburg, Reiner Academy of Sciences of the G.D.R Central Institute of Cybernetics and Information Processes International Basic Laboratory for Image Processing and Computer Graphics Kurstrasse 33 P.O.Box 1298 BerlinDDR-1086 Germany

ISBN: (纸本)9783540506478

In this paper we investigate the parallel conflict-free access to complete extended q-ary subtrees of complete q-ary trees. Thereby the memory module assignment function S is supposed to be recursively linear and nonlinear. Known results for extended binary subtree access are generalized to the case of extended q-ary subtrees. Furthermore optimal solutions for isotropic nonlinear extended q-ary subtree access are given. © by Akademie-Verlag Berlin 1989.

关键词： Forestry

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