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computer graphics Challenges in Electron Microscope Tomography Visualization

Microscopy and Microanalysis 2020年第S2期3卷 1127-1128页

作者： James W. Durkin Program of Computer Graphics Cornell University Ithaca NY14853

We are developing a collaborative research environment, the Collaboratory for Microscopic Digital Anatomy (CMDA), to provide remote access to the sophisticated instrumentation located at the Na-tional Center for Microscopy and Imaging Research (NCMIR). The project’s initial focus is the col-lection and analysis of data from NCMIR’s unique intermediate-high voltage transmission electron microscope (HVEM), an instrument expressly designed to obtain images from thick specimens con-taining substantial 3-D structure. Because of the electron optical characteristics of the microscope, its images represent a 2-D projection of the specimen’s 3-D structure. 3-D data is derived, using axial tomography, from a series of projections acquired as the specimen is successively tilted in small angu-lar increments. Visualizing the 3-D volume data generated by this procedure is a key challenge facing the project. Our experience suggests that existing visualization mechanisms are limited in their ability to fully access the data’s biologically interesting information.

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Vspline 37

Vspline

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37th Annual Conference of the Association for computer Aided Design in Architecture: Disciplines and Disruption, ACADIA 2017

作者： Arnowitz, Ethan Morse, Christopher Greenberg, Donald P. Cornell University Program of Computer Graphics United States

ISBN: (纸本)9780692965061

Virtual reality provides a heightened sense of immersion and spatial awareness that provides a unique opportunity for designers to perceive and evaluate scale and space. At the same time, traditional sketches and small-size physical models provide tactile feedback that allow designers to create, comprehend, and explore complex geometric relationships. Through the development of vSpline, a modeling application for virtual reality, we explore the potential for design within a virtual spatial environment to blur the boundaries between digital and physical stages of design, and seek to combine the best of both virtual and analog worlds. By using spline-based closed meshes created directly in three-dimensional space, our software provides the capabilities to design, modify, and save the information in the virtual world and seamlessly convert the data to evaluate the printing of 3D physical models. We identify and discuss important questions that arise regarding relationships of perception of scale, digital-to-physical domains, and new methods of input and manipulation within a 3D im rsive space. © 2017 CURRAN-CONFERENCE. All rights reserved.

关键词： Virtual reality

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A framework for the experimental comparison of solar and skydome illumination

A framework for the experimental comparison of solar and sky...

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作者： Kider, Joseph T. Knowlton, Daniel Newlin, Jeremy Li, Yining Karl Greenberg, Donald P. Program of Computer Graphics Cornell University United States

(Figure Presented) The illumination and appearance of the solar/skydome is critical for many applications in computer graphics, computer vision, and daylighting studies. Unfortunately, physically accurate measurements of this rapidly changing illumination source are difficult to achieve, but necessary for the development of accurate physically-based sky illumination models and comparison studies of existing simulation models. To obtain baseline data of this time-dependent anisotropic light source, we design a novel acquisition setup to simultaneously measure the comprehensive illumination properties. Our hardware design simultaneously acquires its spectral, spatial, and temporal information of the skydome. To achieve this goal, we use a custom built spectral radiance measurement scanner to measure the directional spectral radiance, a pyranometer to measure the irradiance of the entire hemisphere, and a camera to capture high-dynamic range imagery of the sky. The combination of these computer-controlled measurement devices provides a fast way to acquire accurate physical measurements of the solar/skydome. We use the results of our measurements to evaluate many of the strengths and weaknesses of several sun-sky simulation models. We also provide a measurement dataset of sky illumination data for various clear sky conditions and an interactive visualization tool for model comparison analysis available at http://***/resources/clearsky/. Copyright © ACM.

关键词： Light sources

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Automated translation and thermal zoning of digital building models for energy analysis

Automated translation and thermal zoning of digital building...

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13th Conference of the International Building Performance Simulation Association, BS 2013

作者： Jones, Nathaniel L. McCrone, Colin J. Walter, Bruce J. Pratt, Kevin B. Greenberg, Donald P. Program of Computer Graphics Cornell University Ithaca NY United States

Building energy simulation is valuable during the early stages of design, when decisions can have the greatest impact on energy performance. However, preparing digital design models for building energy simulation typically requires tedious manual alteration. This paper describes a series of five automated steps to translate geometric data from an unzoned CAD model into a multi-zone building energy model. First. CAD input is interpreted as geometric surfaces with materials. Second, surface pairs defining walls of various thicknesses are identified. Third, normal directions of unpaired surfaces are determined. Fourth, space boundaries are defined. Fifth, optionally, settings from previous simulations are applied, and spaces are aggregated into a smaller number of thermal zones. Building energy models created quickly using this method can offer guidance throughout the design process. Copyright © 2011 by IPAC'11/EPS-AG.

关键词： computer aided design

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Edit Propagation via Edge-Aware Filtering

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Journal of computer Science & Technology 2012年第4期27卷 830-840页

作者：胡伟董朝袁国栋 Department of Computer Science and Technology Beijing University of Chemical Technology Program of Computer Graphics Cornell University Department of Computer Science and Technology Tsinghua University

This paper presents a novel framework for efficiently propagating the stroke-based user edits to the regions with similar colors and locations in high resolution images and videos. Our framework is based on the key observation that the edit propagation intrinsically can also be achieved by utilizing recently proposed edge-preserving filters. Therefore, instead of adopting the traditional global optimization which may involve a time-consuming solution, our algorithm propagates edits with the aid of the edge-preserve filters. Such a propagation scheme has low computational complexity and supports multiple kinds of strokes for more flexible user interactions. Further, our method can be easily and efficiently implemented in GPU. The experimental results demonstrate the efficiency and user-friendliness of our approach.

关键词： edit propagation edge-aware domain transform guided filter

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Edit propagation via edge-aware filtering

Edit propagation via edge-aware filtering

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作者： Hu, Wei Dong, Zhao Yuan, Guo-Dong Department of Computer Science and Technology Beijing University of Chemical Technology Beijing 100028 China Program of Computer Graphics Cornell University Ithaca 14853 United States Department of Computer Science and Technology Tsinghua University Beijing 100084 China

关键词： Global optimization

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Fast computation of incident solar radiation from preliminary to final building design

Fast computation of incident solar radiation from preliminar...

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12th Conference of International Building Performance Simulation Association Building Simulation 2011, BS 2011

作者： Jones, Nathaniel L. Greenberg, Donald P. Program of Computer Graphics Cornell University Ithaca NY United States

Accurate calculation of direct solar radiation with current methods is slow and frequently requires oversimplification of building geometry to obtain expedient performance simulations. This paper describes the use of a fast new method for calculating direct solar gains on architectural CAD models at any stage in design. A pre-processing module computes direct incident solar radiation with high accuracy several orders of magnitude faster than common analytical approaches. The technique is illustrated using preliminary CAD models of two existing buildings that are gradually made more complex through the addition of intricate louvered shading devices, foliage, and adjacent urban structures. Each refinement allows EnergyPlus to calculate much more accurate direct solar gain data with only minimal increase in pre-processing time and no effect on energy simulation time.

关键词： Architectural design

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A method for the design and analysis of parametric building energy models

A method for the design and analysis of parametric building ...

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12th Conference of International Building Performance Simulation Association Building Simulation 2011, BS 2011

作者： Pratt, Kevin B. Bosworth, David E. Department of Architecture Cornell University Ithaca NY United States Program of Computer Graphics Cornell University Ithaca NY United States

This paper presents new methods for understanding specific building performance trends and their dependencies by parameterizing digital building models over multiple variables in order to create a high dimensional design space that can be rapidly simulated, analyzed, and visualized. These methods allow for the potential delineation of multiple areas of the design space that are characterized by relatively high performance instead of a single optimum. The ability to identify clusters of high performance is particularly helpful to architectural design processes, which must take into consideration variables that cannot be parameterized and resist quantitative methods of optimization.

关键词： Architectural design

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Visual equivalence: An object-based approach to image quality

Visual equivalence: An object-based approach to image qualit...

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16th Color Imaging Conference: Color Science and Engineering Systems, Technologies, and Applications

作者： Ferwerda, James A. Ramanarayanan, Ganesh Walter, Bruce Bala, Kavita Munsell Color Science Laboratory Center for Imaging Science Rochester Institute of Technology Rochester NY United States Department of Computer Science Cornell University Ithaca NY United States Program of Computer Graphics Cornell University Ithaca NY United States

ISBN: (纸本)9780892082810

In this paper we introduce a new approach to characterizing image quality: visual equivalence, Images are visually equivalent if they convey the same information about object appearance even if they are visibly different. In a series of psychophysical experiments we explore how object geometry, material, and illumination interact to produce images that are visually equivalent, and we identify how two kinds of transformations on illumination fields (blurring and warping) influence observers' judgments of equivalence. We use the results of the experiments to derive metrics that can serve as visual equivalence predictors (VEPs) and we generalize these metrics so they can be applied to novel objects and scenes. Finally we validate the predictors in a confirmatory study, and show that they reliably predict observer's judgments of equivalence. Visual equivalence is a significant new approach to measuring image quality that goes beyond existing visible difference metrics by leveraging the fact that some kinds of image differences do not matter to human observers. By taking advantage of higher order aspects of visual object coding, visual equivalence metrics should enable the development of powerful new classes of image capture, compression, rendering, and display algorithms.

关键词： Image quality

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Measuring affect in HCI: Going beyond the individual

Measuring affect in HCI: Going beyond the individual

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28th Annual CHI Conference on Human Factors in Computing Systems

作者： Shami, N. Sadat Hancock, Jeffrey T. Peter, Christian Muller, Michael Mandryk, Regan Information Science Program Cornell University 301 College Ave Ithaca NY 14850 United States Fraunhofer Institute for Computer Graphics Joachim Jungius Str. 11 18059 Rostock Germany Collaborative User Experience IBM TJ Watson Research Center 1 Rogers St. Cambridge MA 02142 United States Department of Computer Science University of Saskatchewan 176 Thorvaldson Building 110 Science Place Saskatoon SK S7N 5C9 Canada

The measurement of affect in HCI research is a challenging and complex issue. Although a number of techniques for measuring affect have been developed, a systematic discussion of their effectiveness and applicability in different contexts remains lacking, especially in social contexts with multiple users. As computing shifts to increasingly collaborative and ubiquitous models, it is important to discuss affect measurement beyond the individual level. This workshop will provide a forum where designers, practitioners, and researchers can 1) introduce novel methods of affect measurement that go beyond physiological and self-report measures, 2) advance our understanding of existing measurement methods and how they can be expanded, and 3) critically evaluate issues of affect measurement.

关键词： Ubiquitous computing

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