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Perspective projection through parallel projected slabs for virtual endoscopy

Perspective projection through parallel projected slabs for ...

引用

Spring Conference on computer graphics

作者： A. Vilanova R. Wegenkittl A. Konig E. Groller Institute of Computer Graphics University of Technology Vienna Austria Tiani Medgraph China

Virtual endoscopy is a promising medical application for volume rendering techniques where perspective projection is mandatory. Most of the acceleration techniques for direct volume rendering make use of parallel projection. This is also the case of the current generation of VolumePro systems, which achieve real-time frame rates but unfortunately just provide parallel projection. In this paper, an algorithm to approximate perspective volume rendering using parallel projected slabs is presented. The introduced error due to the approximation is investigated. Based on the error estimation, an improvement to the basic algorithm is presented. The improvement increases the frame rate keeping the global maximal error bounded. The usability of the algorithm is shown through the virtual endoscopic investigation of various types of medical data sets.

关键词： Slabs Endoscopes Rendering (computer graphics) Acceleration Biomedical imaging Medical diagnostic imaging Data visualization Hardware Error analysis computer graphics

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Articulated soft objects for video-based body modeling

Articulated soft objects for video-based body modeling

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International Conference on computer Vision (ICCV)

作者： R. Plankers P. Fua Computer Graphics Laboratory LIG Swiss Federal Institute of Technology Lausanne Switzerland

ISBN: (纸本)0769511430

We develop a framework for 3-D shape and motion recovery of articulated deformable objects. We propose a formalism that incorporates the use of implicit surfaces into earlier robotics approaches that were designed to handle articulated structures. We demonstrate its effectiveness for human body modeling from video sequences. Our method is both robust and generic. It could easily be applied to other shape and motion recovery problems.

关键词： Biological system modeling Shape Humans Video sequences Robustness Robots Skeleton Skin Solid modeling Predictive models

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Real-time 3D object recognition for automatic tracker initialization

Real-time 3D object recognition for automatic tracker initia...

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IEEE and ACM International Symposium on Augmented Reality

作者： G. Blasko P. Fua Computer Graphics Laboratory LIG Swiss Federal Institute of Technology Lausanne Switzerland

We propose a vision based real-time object recognition system, that provides object identification and 3D position data for the automatic initialization of a 3D tracking system. A-priori information is generated using the models of objects which may be present in the image. During recognition this data is accessed, using the position of corner features in the video image for indexing. A voting scheme is used to recognize objects and their positions in a single run. Upon recognition, a 3D object tracker can be automatically provided with initialization data.

关键词： Object recognition Image recognition Histograms computer graphics Voting Image databases Spatial databases Indexing Augmented reality Image processing

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Nonlinear virtual colon unfolding

Nonlinear virtual colon unfolding

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IEEE Conference on Visualization

作者： A.V. Vilanova Bartroli R. Wegenkittl A. Konig E. Groller Institute of Computer Graphics and Algorithms University of Technology Vienna Austria Tiani Medgraph Austria

ISBN: (纸本)0780372018

The majority of virtual endoscopy techniques tries to simulate a real endoscopy. A real endoscopy does not always give the optimal information due to the physical limitations it is subject to. In this paper, we deal with the unfolding of the surface of the colon as a possible visualization technique for diagnosis and polyp detection. A new two-step technique is presented which deals with the problems of double appearance of polyps and nonuniform sampling that other colon unfolding techniques suffer from. In the first step, a distance map from a central path induces nonlinear rays for unambiguous parameterization of the surface. The second step compensates for locally varying distortions of the unfolded surface. A technique similar to magnification fields in information visualization is hereby applied. The technique produces a single view of a complete, virtually dissected colon.

关键词： Colon Endoscopes Visualization Colonic polyps Colonography Computed tomography Inspection Biomedical imaging Magnetic resonance imaging computer graphics

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Optimization of data access in behavioral modelling of computer animation

Optimization of data access in behavioral modelling of compu...

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International Symposium on Signal Processing and Its Applications (ISSPA)

作者： Kee Ping Ho Eng Chong Tan Kok Cheong Wong Center for Graphics and Imaging Technology School of Computer Engineering Nanyang Technological University Singapore

Behavioral modelling encompasses a number of processing requirements. These include the processing of any mental attributes, the perceived environment and the actions to be performed. These increase the load of any processor running the simulation. If there are many such behavioral modules in an animation, the playback of the scene becomes non-interactive. A simple way to improve playback speed is to store the simulation data at suitable locations. Playback of the animation is then just a matter of reading the simulation data. The speedup is often visually noticeable, although it is at the cost of storage space.

关键词： Animation Layout Costs Signal processing computer graphics Motion pictures Packaging Production Control systems Application software

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Weight-biased edge-crossover in evolutionary algorithms for two graph problems 01

Weight-biased edge-crossover in evolutionary algorithms for ...

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2001 ACM Symposium on Applied Computing, SAC 2001

作者： Julstrom, Bryant A. Raidl, Günther R. Department of Computer Science St. Cloud State University 720 Fourth Avenue South St. CloudMN56301 United States Institute of Computer Graphics and Algorithms Vienna University of Technology Favoritenstraße 9-11/1861 Vienna1040 Austria

ISBN: (纸本)1581132875

Many optimization problems on weighted graphs seek a subset of the graph's edges that has minimum weight and satisfies the problem's constraints. Two examples are the traveling salesman problem (TSP) and the degree-constrained minimum spanning tree problem (d-MSTP). Heuristics like evolutionary algorithms often construct candidate solutions to such problems iteratively, repeatedly including an edge selected from those currently eligible. Not surprisingly, low-weight edges usually predominate in good and optimal solutions, an observation we confirm empirically for the TSP and the d-MSTP. This suggests that any process that builds candidate solutions should, with higher probability, select edges of lower weight. We incorporate into crossover operators and compare in a genetic algorithm four edge-selection techniques: random, greedy, according to probabilities inversely proportional to the edges' weights, and 2-tournament. Tests on instances of the TSP and the d-MSTP indicate that with the weight-biased techniques, the GA identifies better solutions faster than with random edge-selection. © 2001 ACM.

关键词： Traveling salesman problem

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Extendible tracking by line auto-calibration

Extendible tracking by line auto-calibration

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IEEE and ACM International Symposium on Augmented Reality

作者： B. Jiang U. Neumann Computer Graphics and Immersive Technology Laboratory Integrated Media Systems Center University of Southern California USA

One of the key requirements for an augmented reality system is a tracking system that determines the user's viewpoint accurately. Many vision-based tracking systems exhibit limited tracking range due to their dependence on pre-calibrated features. Previous extendible-tracking systems only make use of point features. This paper describes an extendible tracking method that integrates pre-calibrated landmarks and natural line features for camera tracking. Extendible and robust tracking is achieved by dynamically calibrating prior uncalibrated 3D structure of line features. The experimental results indicate the effectiveness of this approach for extending the tracking range and reducing dependence on the prepared environment. (Plus color plates).

关键词： Cameras Augmented reality Electrical capacitance tomography computer graphics Laboratories Identity-based encryption Network address translation Robustness Machine vision Large-scale systems

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A flexible polygon representation of multiple overlapping regions of interest for wavelet-based image coding

A flexible polygon representation of multiple overlapping re...

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IEEE International Conference on Image Processing

作者： U. Rauschenbach R. Rosenbaum H. Schumann Corporate Technology SIEMENS AG Munich Germany Computer Science Department Institute of Computer Graphics. University of Rostock Rostock Germany

Image transmission over low-bandwidth channels can be speeded up if the image coding mechanism supports regions of interest (RoIs). By such a scheme, image parts not belonging to RoIs can be encoded at a lower bitrate. This paper describes a flexible dynamic RoI scheme which supports the definition of arbitrarily-shaped RoIs before the start of the transmission process and the refinement of a partially transmitted image by the definition of new RoIs at any time during image transmission. The overhead to represent RoIs is kept as small as possible by exploiting a polygon-based RoI representation. Span arithmetic on a multiresolution grid is used to support the redundancy-free transmission of overlapping RoIs.

关键词： Image coding Image communication Shape Arithmetic Wavelet coefficients computer science computer graphics Computed tomography Bit rate Lapping

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Programming behaviors with local perception and smart objects: an approach to solve autonomous agents tasks

Programming behaviors with local perception and smart object...

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Brazilian Symposium on computer graphics and Image Processing (SIBGRAPI)

作者： L.M.G. Goncalves M. Kallmann D. Thalmann Instituto de Computação Universidade Estadual de Campinas Campinas SP Brasil Computer Graphics Laboratory (LIG) Swiss Federal Institute of Technology Lausanne Switzerland Computer Graphics Lab (LIG) Swiss Federal Institute of Technology (EPFL) Lausanne Switzerland

We propose an integrated framework in which local perception and close manipulation skills are used in conjunction with a high-level behavioral interface based on a "smart object" paradigm as support for a virtual agent to perform autonomous tasks. In our model, virtual "smart objects" encapsulate information about possible interactions between the agent and its environment, including sub-tasks defined by scripts that the agent can perform. We use the information provided by low-level sensing mechanisms to construct a set of local, perceptual features, with which to categorize at run-time possible target objects. Once objects are activated, based on their interactivity information and on the current task script, the agent can reparametrize its behavior, according to its mission goal defined in a global plan script. A challenging problem solved here is the construction (abstraction) of the mechanism to link individual perceptions to actions. As a practical result virtual agents are capable of acting with more autonomy, enhancing their performance.

关键词： Autonomous agents Solid modeling Robot kinematics Humans Automatic control Virtual environment graphics Runtime Information geometry Information retrieval

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Adaptive reconstruction of freeform objects with 3D SOM neural network grids

Adaptive reconstruction of freeform objects with 3D SOM neur...

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Pacific Conference on computer graphics and Applications

作者： J. Barhak A. Fischer CMSR Laboratory for Computer Graphics and CAD Department of Mechanical Engineering Technion-Israel Institute of Technology Haifa Israel

Reverse engineering is an important process in CAD systems today. Yet several open problems lead to a bottleneck in the reverse engineering process. First, because the topology of the object to be reconstructed is unknown, point connectivity relations are undefined. Second, the fitted surface must satisfy global and local shape preservation criteria that are undefined explicitly. In reverse engineering, object reconstruction is based both on parameterization and on fitting. Nevertheless, the above problems are influenced mainly by parameterization. In order to overcome the above problems, the paper proposes a neural network, Self Organizing Map (SOM) method, for creating a 3D parametric grid. The main advantage of the proposed SOM method is that it detects both the orientation of the grid and the position of the sub-boundaries. The neural network grid converges to the sampled shape through an adaptive learning process. The SOM method is applied directly on 3D sampled data and avoids the projection anomalies common to other methods. The paper also presents boundary correction and growing grid extensions to the SOM method. In the surface fitting stage, an RSEC (Random Surface Error Correction) fitting method based on the SOM method was developed and implemented.

关键词： Neural networks Surface fitting Reverse engineering Surface reconstruction Shape Spline Laser modes Data mining Jacobian matrices Laboratories

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