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23rd SIBGRAPI Conference on graphics, Patterns and images, SIBGRAPI 2010

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

ISBN: (纸本)9780769542300

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. © 2010 IEEE.

关键词： graphics processing unit

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Using acceleration data from smartphones to interact with 3D medical data

Using acceleration data from smartphones to interact with 3D...

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23rd SIBGRAPI Conference on graphics, Patterns and images, SIBGRAPI 2010

作者： De Souza, Mateus Carvalho, Diego Dias Bispo Barth, Peter Ramos, Jeferson Vieira Comunello, Eros Von Wangenheim, Aldo LAPIX - Laboratory for Image Processing and Computer Graphics Federal University of Santa Catarina Florianópolis Brazil Hochschule RheinMain Wiesbaden Germany

ISBN: (纸本)9780769542300

Accelerometers integrated in modern smartphones pave the way to intuitively use gestures for collaboratively controlling interactive applications. Using and holding smartphones has become natural and ensures user acceptance as well as intuitive handling. We focus on using accelerators in several smartphones at the same time to interactively control a medical imaging solution. To this end, we introduce a framework to collect, modify, and distribute acceleration sensor data from multiple smartphones and integrate it with a medical imaging system which results in an environment suitable for e.g. doctors reviewing and explaining diagnostic findings. We performed some experiments to evaluate the usability of this approach and present an ongoing research in adapting the smartphone interface to physical simulation applications. © 2010 IEEE.

关键词： Smartphones

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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

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

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Using Acceleration Data from Smartphones to Interact with 3D Medical Data

Using Acceleration Data from Smartphones to Interact with 3D...

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Brazilian Symposium on computer graphics and image processing (SIBGRAPI)

作者： Mateus de Souza Diego Dias Bispo Carvalho Peter Barth Jeferson Vieira Ramos Eros Comunello Aldo von Wangenheim LAPIX - Laboratory for Image Processing and Computer Graphics Federal University of Santa Catarina Florianópolis Brazil Hochschule RheinMain Wiesbaden Germany

关键词： Smart phones Acceleration Biomedical imaging Medical services Three dimensional displays Skull Mice

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A Fast Lossless Compression Scheme for Digital Map images Using Color Separation

A Fast Lossless Compression Scheme for Digital Map Images Us...

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IEEE International Conference on Acoustics, Speech, and Signal processing

作者： Saif Zahir Arber Borici Graphics and Image Processing Lab Computer Science University of N. British Columbia BC Canada

ISBN: (纸本)9781424442959

In this paper, we present a fast lossless compression scheme for digital map images in the raster image format. This work contains two main contributions. The first is centered around the creation of a code book that is based on symbol-entropy. The second contribution is the introduction of a new row-column reduction algorithm. Our scheme proceeds as follows: we determine the number of different colors in a given map image. For each color, we create a separate bi-level data layer, one for the color and the second is for the background. Then, we compress each bi-level layer individually using the proposed method, which is based on symbol-entropy in conjunction with our row-column reduction coding algorithm. Our experimental results show that our lossless compression scheme achieved on average a compression equal to 0.035 bits per pixel which is better than most reported results in the literature or comparable to some. Moreover, our scheme is simple and fast.

关键词： Lossless image compression entropy symbol entropy map images map image compression GIS map compression

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Optimal constrained multi-degree reduction of Bézier curves with explicit expressions based on divide and conquer

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第4期10卷 577-582页

作者： Lian ZHOU Guo-jin WANG Institute of Computer Graphics and Image Processing State Key Lab of CAD & CG Zhejiang University Hangzhou 310027 China

We decompose the problem of the optimal multi-degree reduction of Bézier curves with corners constraint into two simpler subproblems, namely making high order interpolations at the two endpoints without degree reduction, and doing optimal degree reduction without making high order interpolations at the two endpoints. Further, we convert the second subproblem into multi-degree reduction of Jacobi polynomials. Then, we can easily derive the optimal solution using orthonormality of Jacobi polynomials and the least square method of unequally accurate measurement. This method of 'divide and conquer' has several advantages including maintaining high continuity at the two endpoints of the curve, doing multi-degree reduction only once, using explicit approximation expressions, estimating error in advance, low time cost, and high precision. More importantly, it is not only deduced simply and directly, but also can be easily extended to the degree reduction of surfaces. Finally, we present two examples to demonstrate the effectiveness of our algorithm.

关键词： Bezier curves Multi-degree reduction Divide and conquer

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A new method in highway route design:joining circular arcs by a single C-Bézier curve with shape parameter

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第4期10卷 562-569页

作者： Hua-hui CAI Guo-jin WANG Institute of Computer Graphics and Image Processing State Key Lab of CAD & CG Zhejiang University Hangzhou 310027 China

We constructed a single C-Bezier curve with a shape parameter for G^2 joining two circular arcs. It was shown that an S-shaped transition curve, which is able to manage a broader scope about two circle radii than the Bezier curves, has no curvature extrema, while a C-shaped transition curve has a single curvature extremum. Regarding the two kinds of curves, specific algorithms were presented in detail, strict mathematical proofs were given, and the effectiveness of the method was shown by examples This method has the following three advantages：（1） the pattern is unified; （2） the parameter able to adjust the shape of the transition curve is available; （3） the transition curve is only a single segment, and the algorithm can be formulated as a low order equation to be solved for its positive root. These advantages make the method simple and easy to implement.

关键词： Transition curve C-Bezier curve Monotone curvature Shape parameter

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Simplified Simulation and Visualization of Tubular Flows with Approximate Centerline Generation

Simplified Simulation and Visualization of Tubular Flows wit...

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2009 22nd IEEE International Symposium on computer-Based Medical Systems, CBMS 2009

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

ISBN: (纸本)9781424448784

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 centerline provides approximations of measures about the tubular structure such as length of regions of interest and crosssection 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. © 2009 IEEE.

关键词： Fluid structure interaction

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A multi-layered development framework for medical imaging applications

A multi-layered development framework for medical imaging ap...

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2009 22nd IEEE International Symposium on computer-Based Medical Systems, CBMS 2009

作者： Silva, André Ferreira Bem Carvalho, Diego Dias Bispo Nóbrega, Tiago H. C. Inácio, Renan Teston Von Wangenheim, Aldo LAPIX - Laboratory for Image Processing and Computer Graphics UFSC - Federal University of Santa Catarina Florianópolis Santa Catarina Brazil

ISBN: (纸本)9781424448784

computer Aided Diagnostic comprises wide research areas with stability and reliability software requirements. We propose a set of libraries aiming to provide a development framework for medical applications. This framework's libraries, mostly written from scratch (e.g Core library), were developed for both medical imaging systems and general physical simulations. Their internal interactions tend to be transparent to the developer and easy to use at the same time while providing flexibility to interact with other codes. The robustness of the code is shown in complex applications like the medical workstation here exemplified, while its flexibility and fast prototyping characteristics are exemplified with some simple demonstrations. © 2009 IEEE.

关键词： Libraries

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Simplified simulation and visualization of tubular flows with approximate centerline generation

Simplified simulation and visualization of tubular flows wit...

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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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