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Interactive Density Maps for Moving Objects

IEEE computer graphics AND APPLICATIONS 2012年第1期32卷 56-66页

作者： Scheepens, Roeland Willems, Niels van de Wetering, Huub van Wijk, Jarke J. Eindhoven Univ Technol Dept Math & Comp Sci NL-5600 MB Eindhoven Netherlands

Trajectories capture the movements of objects with multiple attributes. A visualization method called density maps shows trends in these trajectories. Density map creation involves aggregating smoothed trajectories in a density field and then visualizing the field. Users can explore attributes along trajectories by calculating a density field for multiple data subsets. The method then either combines these density fields into a new density field or visualizes them and then combines them. Using an interactive distribution map, users can define subsets and, supported by graphics hardware, get fast feedback for these computationally expensive density field calculations. Given the generic method and the lack of domain-specific assumptions, this method might also be applicable for trajectories in other domains.

关键词： Trajectory Image Color Analysis Density Measurement Data Visualization rendering computer graphics Smoothing Methods Object Recognition computer graphics Trajectories Multivariate Data Smoothing Kernel Density Estimation

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Efficient Surgical Cutting with Position-Based Dynamics

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IEEE computer graphics AND APPLICATIONS 2017年第3期37卷 24-31页

作者： Berndt, Iago Torchelsen, Rafael Maciel, Anderson Univ Fed Rio Grande do Sul Inst Informat Comp Sci Porto Alegre RS Brazil Univ Fed Pelotas Ctr Technol Dev Pelotas RS Brazil Univ Fed Rio Grande do Sul Inst Informat Porto Alegre RS Brazil

This paper addresses common problems with traditional surgery simulation scenarios and proposes PBD-based solutions. Specifically, it introduces a skinning scheme that supports interactive tissue cutting with haptic feedback. In addition, it also presents a method to configure cluster constraints with PBD and an approach to simulate electrosurgery.

关键词： Biological Tissues Digital Simulation Haptic Interfaces Interactive Systems Medical Computing Surgery Electrosurgery Simulation Cluster Constraints Haptic Feedback Interactive Tissue Cutting Skinning Scheme PBD Based Solutions Surgery Simulation Position Based Dynamics Surgical Cutting Surgery Computational Modeling rendering computer graphics Visualization Finite Element Analysis Mathematical Model Heuristic Algorithms Haptic Interfaces computer graphics computer graphics Applications Cutting Simulation Position Based Dynamics Meshless Models Skinning Haptic Interaction Virtual Surgery

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Shader-Like Computations in WebGL for Advanced graphics and General Purposes

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COMPUTING IN SCIENCE & ENGINEERING 2021年第2期23卷 54-63页

作者： Watters, Aaron R. Flatiron Inst Comp Core New York NY 10010 USA

The feedWebGL2 software package enables parallel computations using a feature of HTML5/WebGL2 called Transform/Feedback. The Transform/Feedback mechanism can be used within Jupyter widgets or in other web components and applications for a special class of parallel computations called shader-like calculations, which can solve many problems well, but are unsuitable for some classes of parallel algorithms. This article describes the characteristics of shader-like calculations and how they can be created using the feedWebGL2 software package. The example programs use shader-like calculations for special purpose graphical stages in combination with standard WebGL graphics pipelines, and also use them for general purposes, such as matrix computations.

关键词： Internet Parallel Algorithms rendering computer graphics Software Packages Transform Feedback Matrix Computations Standard Web GL graphics Pipelines Special Purpose Graphical Stages Parallel Algorithms Shader Like Calculations Web Components Jupyter Widgets Parallel Computations Feed Web GL 2 Software Package General Purposes Advanced graphics Shader Like Computations Pipelines Isosurfaces Context Modeling Python Image Color Analysis graphics Processing Units Software Packages

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Conservative Sampling of Solids in Image Space

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IEEE computer graphics AND APPLICATIONS 2013年第1期33卷 32-43页

作者： Leung, Yuen-Shan Wang, Charlie C. L. Chinese Univ Hong Kong Dept Mech & Automat Engn Hong Kong Hong Kong Peoples R China

Conservative sampling samples boundary representation (B-rep) solid models into layered depth images (LDIs). The resulting models have a closed boundary and are guaranteed to bound the input B-rep models on the rays o... 详细信息

关键词： Sampling rendering computer graphics graphics Processing Units Solid Modeling Image Representation Sorting GPU Sampling rendering computer graphics graphics Processing Units Solid Modeling Image Representation Sorting computer graphics Sampling Solid Model Image Space Layered Depth Images

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Exploring the Connectome Petascale Volume Visualization of Microscopy Data Streams

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IEEE computer graphics AND APPLICATIONS 2013年第4期33卷 50-61页

作者： Beyer, Johanna Hadwiger, Markus Al-Awami, Ali Jeong, Won-Ki Kasthuri, Narayanan Lichtman, Jeff W. Pfister, Hanspeter King Abdullah Univ Sci & Technol Geometr Modeling & Sci Visualizat Ctr Jeddah Saudi Arabia King Abdullah Univ Sci & Technol Jeddah Saudi Arabia Ulsan Natl Inst Sci & Technol Ulsan South Korea Harvard Univ Lichtman Lab Cambridge MA 02138 USA Harvard Univ Cambridge MA 02138 USA Harvard Univ Sch Engn & Appl Sci Cambridge MA 02138 USA

Recent advances in high-resolution microscopy let neuroscientists acquire neural-tissue volume data of extremely large sizes. However, the tremendous resolution and the high complexity of neural structures present big challenges to storage, processing, and visualization at interactive rates. A proposed system provides interactive exploration of petascale (petavoxel) volumes resulting from high-throughput electron microscopy data streams. The system can concurrently handle multiple volumes and can support the simultaneous visualization of high-resolution voxel segmentation data. Its visualization-driven design restricts most computations to a small subset of the data. It employs a multiresolution virtual-memory architecture for better scalability than previous approaches and for handling incomplete data. Researchers have employed it for a 1-teravoxel mouse cortex volume, of which several hundred axons and dendrites as well as synapses have been segmented and labeled.

关键词： Data Visualization Neuroscience Image Resolution rendering computer graphics Microscopy Streaming Media Medical Image Processing computer graphics Petascale Volume Exploration Segmented Volume Data High Resolution Microscopy High Throughput Imaging Neuroscience

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10 Years of MegaMol The Pain and Gain of Creating Your Own Visualization Framework

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IEEE computer graphics AND APPLICATIONS 2018年第1期38卷 109-114页

作者： Krone, Michael Grottel, Sebastian Reina, Guido Muller, Christoph Ertl, Thomas Univ Stuttgart Visualizat Res Ctr Stuttgart Germany Tech Univ Dresden Comp Graph & Visualizat Lab Dresden Germany Univ Stuttgart Inst Visualizat & Interact Syst Stuttgart Germany

This article discusses our experience in creating MegaMol, an open-source visualization framework for large particle-based data.

关键词： Data Structures Data Visualisation Large Particle Based Data Open Source Visualization Framework Mega Mol Data Visualization Prototypes Task Analysis rendering computer graphics Programming graphics Processing Units Applications Visualization Framework Megamol computer graphics

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The MPEG Immersive Video Standard-Current Status and Future Outlook

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IEEE MULTIMEDIA 2022年第3期29卷 101-110页

作者： Vadakital, Vinod Kumar Malamal Dziembowski, Adrian Lafruit, Gauthier Thudor, Franck Lee, Gwangsoon Alface, Patrice Rondao Ofinno LLC Tampere 33720 Finland Poznan Univ Tech Inst Multimedia Telecommun PL-60965 Poznan Poland Univ Libre Bruxelles B-1050 Brussels Belgium InterDigital F-35510 Cesson Sevigne France Elect & Telecommun Res Inst Daejeon 34129 South Korea Nokia Technol B-2018 Antwerp Belgium

The MPEG immersive video (MIV) standard is the latest addition to the MPEG-1 suite of standards. It focuses on the representation and coding of immersive media. MIV is designed to support virtual and extended reality applications that require six degrees of freedom visual interaction with the rendered scene. Edition-1 of MIV is now in its final phase of standardization. Leveraging conventional 2-D video codecs, the MIV standard efficiently codes volumetric scenes and allows advanced visual effects like bullet-time fly-throughs. The video feeds capturing the scene are first processed to identify a set of basic views that are augmented with additional information from all other views. The data are then intelligently packed into atlases and further compressed with any existing 2-D video codec of choice. Experimental results show BD-PSNR gains of up to 6 dB in the 10-20 Mbps range compared to a naive simulcast multiview video coding approach. This article concludes with an outlook on future extensions for the second edition of MIV.

关键词： Video Coding Video Codecs Soft Sensors Transform Coding Visual Effects rendering computer graphics Encoding Extended Reality

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Volumetric Ambient Occlusion for Real-Time rendering and Games

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IEEE computer graphics AND APPLICATIONS 2010年第1期30卷 70-79页

作者： Szirmay-Kalos, Laszlo Umenhoffer, Tamas Toth, Balazs Szecsi, Laszlo Sbert, Mateu Univ Girona Girona Spain Budapest Univ Technol & Econ Dept Control Engn & Informat Technol Budapest Hungary Budapest Univ Technol & Econ Comp Graph Grp Budapest Hungary

This new GPU-based algorithm can compute ambient occlusion to inexpensively approximate global-illumination effects in real-time systems and games. The algorithm is based on a novel interpretation of ambient occlusion... 详细信息

关键词： Lighting Equations Layout rendering computer graphics Particle Measurements Economic Forecasting Light Sources Real Time Systems Computational Efficiency Image Quality graphics And Multimedia Volumetric Ambient Occlusion Obscurance GPU Importance Sampling computer graphics

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Efficient C²-Weighting for Image Warping

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IEEE computer graphics AND APPLICATIONS 2018年第1期38卷 59-76页

作者： Xian, Chuhua Jin, Shuo Wang, Charlie C. L. South China Univ Technol Sch Comp Sci & Engn Guangzhou Guangdong Peoples R China Chinese Univ Hong Kong Dept Mech & Automat Engn Hong Kong Hong Kong Peoples R China Delft Univ Technol Dept Design Engn Adv Mfg Delft Netherlands

Handle-driven image warping based on linear blending is widely used in many applications because of its merits on intuitiveness, efficiency, and ease of implementation. In this paper, we develop a method to compute high-quality weights within a closed domain for image warping. The property of C-2 continuity in weights is guaranteed by the carefully formulated basis functions. The efficiency of our algorithm is ensured by a closed-form formulation of the computation for weights. The cost of inserting a new handle is only the time to evaluate the distances from the new handle to all other sample points in the domain. A virtual handle insertion algorithm is developed to allow users to freely place handles within the domain while preserving the satisfaction of all expected criteria on weights for linear blending. Experimental examples for real-time applications are shown to demonstrate the effectiveness of this method.

关键词： Image Reconstruction Virtual Handle Insertion Algorithm Closed Form Formulation High Quality Weights Image Warping Linear Blending Real Time Systems rendering computer graphics Deformable Models Computational Modeling Hardware Applications Integrated Circuits Types And Design Styles Standard Cells Memory Technologies Image Warping computer graphics

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Scale-Aware Spatially Guided Mapping

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IEEE MULTIMEDIA 2016年第3期23卷 34-42页

作者： Hao, Shijie Guo, Yanrong Hong, Richang Wang, Meng Hefei Univ Technol Sch Comp & Informat Hefei Anhui Peoples R China Univ N Carolina Dept Radiol Chapel Hill NC USA Univ N Carolina BRIC Chapel Hill NC USA Hefei Univ Technology Dept Comp & Informat Hefei Anhui Peoples R China

By combining multiple spatial influences at different levels of detail, the scale-aware spatially guided mapping (SaSGM) model can differentiate image contents in terms of scale, and models extended with SaSGM can gen... 详细信息

关键词： Image Enhancement Scale Aware Spatially Guided Mapping Sa SGM Model Image Processing Models Detail Enhancement Image Stylization Models Visual Effects Quality Modeling Image Edge Detection Filtering rendering computer graphics Visualization Learning Systems Computational Modeling Image Filter Scale Aware Image Enhancing Image Stylization graphics Image Processing Modeling

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