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检索条件"任意字段=International Conference on Computer Graphics, Imaging and Visualization"

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Plant Root System Analysis from MRI Images

Plant Root System Analysis from MRI Images

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7th international Joint conference on computer Vision, imaging and computer graphics Theory and Applications, VISIGRAPP 2012

作者： Schulz, Hannes Postma, Johannes A. van Dusschoten, Dagmar Scharr, Hanno Behnke, Sven Computer Science VI: Autonomous Intelligent Systems University Bonn Friedrich-Ebert-Allee 144 53113 Bonn Germany IBG-2: Plant Sciences Forschungszentrum Jülich 52425 Jülich Germany

ISBN: (纸本)9783642382406

We present a novel method for deriving a structural model of a plant root system from 3D Magnetic Resonance imaging (MRI) data of soil grown plants and use it for plant root system analysis. The structural model allows calculation of physiologically relevant parameters. Roughly speaking, MRI images show local water content of the investigated sample. The small, local amounts of water in roots require a relatively high resolution, which results in low SNR images. However, the spatial resolution of the MRI images remains coarse relative to the diameter of typical fine roots, causing many gaps in the visible root system. To reconstruct the root structure, we propose a three step approach: 1) detect tubular structures, 2) connect all pixels to the base of the root using Dijkstras algorithm, and 3) prune the tree using two signal strength related thresholds. Dijkstras algorithm determines the shortest path of each voxel to the base of the plant root, weighing the Euclidean distance measure by a multi-scale vesselness measure. As a result, paths running within good root candidates are preferred over paths in bare soil. We test this method using both virtually generated MRI images of Maize and real MRI images of Barley roots. In experiments on synthetic data, we show limitations of our algorithm with regard to resolution and noise levels. In addition we show how to use our reconstruction for root phenotyping on real MRI data of barley roots and snow pea in soil. Extending our conference publication [1], we show how to use the structural model to remove unwanted structures, like underground weeds. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Magnetic resonance imaging

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The role of direct manipulation of visualizations in the development and use of multi-level knowledge models

The role of direct manipulation of visualizations in the dev...

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2013 17th international conference on Information Visualisation, IV 2013

作者： Goebel, Randy Shi, Wei Tanaka, Yuzuru Department of Computing Science University of Alberta Edmonton AB T6G 2E8 Canada MemeMedia Laboratory Hokkaido University N 13 W 8 Kita-ku Sapporo 060- 8628 Japan

ISBN: (纸本)9780769550497

The proliferation of touch sensitive display screens has created a new generation of human-computer interaction styles which are so natural and common that even the youngest of users now perceive ordinary static media like a glossy magazine as a broken iPad. The volume of users who expect to be able to pinch, grab, twist and manipulate images on screen is rapidly growing;they drive a renewed interest in developing, assessing, and delivering new direct manipulation systems. Our premise is that one can exploit new technologies to develop new repertoires of direct manipulation, but with increasing pressure to provide semantically-coupled direct manipulation methods to experiment with computational information models. We develop this premise by noting highlights in the evolution of direct manipulation interfaces, and suggest that their selection and deployment can be tailored as visual experiments to debug and extend more complex computational models of information systems and processes. These systems and processes include those of natural systems such as arise in systems biology (e.g., modelling multiple levels of protein structure), but also in 'unnatural' systems such as in the identification of hubs and authorities in artificial systems like the World Wide Web (WWW). The immediate consequence of our premise suggests that the design of direct manipulation tools should proceed with the semantics of the modelled systems in mind, so that each users' manipulations provide a new perspective on the concept of 'data mining' of large data sets. This will allow users to not just expose implicit relationships, but to incrementally combine explanatory and exploratory investigation by direct manipulation, to adjust and improve the computational knowledge models that emerge from the underlying data. © 2013 IEEE.

关键词： visualization

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Marking menus for eyes-free interaction using smart phones and tablets

Marking menus for eyes-free interaction using smart phones a...

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IFIP WG 8.4, 8.9, TC 5 international Cross-Domain conference on Availability, Reliability, and Security in Information Systems and HCI, CD-ARES 2013

作者： Bauer, Jens Ebert, Achim Kreylos, Oliver Hamann, Bernd Computer Graphics HCI Lab. TU Kaiserslautern 67663 Kaiserslautern Germany Institute for Data Analysis and Visualization Department of Computer Science University of California Davis CA 95616 United States

ISBN: (纸本)9783642405105

Large displays are helpful tools for knowledge discovery applications. The increased screen real estate allows for more data to be shown at once. In some cases using virtual reality visualizations helps in creating more useful visualizations. In such settings, traditional input devices are not well-suited. They also do not scale well to multiple users, effectively limiting collaborative knowledge discovery scenarios. Smart phones and tablet computers are becoming increasingly ubiquitous and powerful, even having multi-core CPUs and dedicated Graphic Processing Units (GPUs). Given their built-in sensors they can serve as replacements for currently-used input devices, and provide novel functionality not achieved with traditional devices. Furthermore, their ubiquity ensures that they scale well to multi-user environments, where users can use their own devices. We present an application-independent way to integrate smart phones and tablets into knowledge discovery applications as input devices with additional functionality. This approach is based on Marking Menus, but extends the basic idea by employing the special capabilities of current consumer-level smart phones and tablets. © 2013 IFIP international Federation for Information Processing.

关键词： Smartphones

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A spatial keyword evaluation framework for network-based spatial queries 13

A spatial keyword evaluation framework for network-based spa...

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21st ACM SIGSPATIAL international conference on Advances in Geographic Information Systems, ACM SIGSPATIAL GIS 2013

作者： Zhang, Ji Ku, Wei-Shinn Jiang, Xunfei Qin, Xiao Dept. of Computer Science and Software Engineering Auburn University Auburn AL 36849 United States

ISBN: (纸本)9781450325219

An increasing number of spatial keyword query techniques that return qualified objects based on a comprehensive consideration of spatial and keyword constraints have been presented in the literature. Due to the complexity of the solutions to spatial keyword queries, systems that can effectively demonstrate the mechanisms will attract interest from the spatial database research community. However, very limited visualization systems have been developed for illustrating spatial keyword query evaluation. In this demonstration, we present a system that visualizes advanced solutions to efficiently answer the Spatial Keyword k Nearest Neighbor (SKkNN) query. With the two-level data management method and the friendly user interface implemented by the Standard Widget Toolkit (SWT) and Open graphics Library (OpenGL), our system is able to not only interact with users in diverse manners, visualize datasets, and display the SKkNN query evaluation process, but it also helps users better understand the solutions in a more intuitive way. © 2013 Authors.

关键词： Location based services

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3D image reconstruction: Techniques, applications and challenges

3D image reconstruction: Techniques, applications and challe...

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international conference on Optical imaging Sensor and Security (ICOSS)

作者： Rashmita Khilar S. Chitrakala SurenderNath SelvamParvathy Department Of Computer Science and Engineering Easwari Engineering College Department Of Computer Science and Engineering Anna University Department Of Information Science and Technology Anna University

Image Reconstruction is generally an inverse problem, which helps to recover the original ideal image from its given bad version, such as one that is snowed by noise, blurred by atmospheric turbulence or that has some regions damaged. Image reconstruction techniques are used to create 3D images from sets of various projections. The task of generating fast and accurate 3D image reconstruction has found its application in the field of computer vision like robotics, entertainment, reverse engineering, augmented reality, human computer interaction and animation. This paper deals with detailed study on different methods and evaluation technique used in 3D image reconstructions like visualization technique, triangulation method, multiple kinect capturing system, handling photometric stereo and shadowing information in handling patches. Finally several recommendations on future study have been recommended based on recent issues like reconstructing geometrical shadow region, handling self shadow, shiny object, non-Iambatian surface, occlusion, reconstruction without the use of sensors like Global Positioning System (GPS) and Inertial Navigation System (INS).

关键词： Three-dimensional displays Image reconstruction Solid modeling Face Shape Cameras Rendering (computer graphics)

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Distance-Aware Bimanual Interaction for Large High-Resolution Displays

Distance-Aware Bimanual Interaction for Large High-Resolutio...

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7th international Joint conference on computer Vision, imaging and computer graphics Theory and Applications, VISIGRAPP 2012

作者： Lehmann, Anke Staadt, Oliver Institute for Computer Science University of Rostock Albert-Einstein-Str. 22 18051 Rostock Germany

ISBN: (纸本)9783642382406

Large high-resolution displays allow users to perceive the global context of information from a distance and to explore detailed information at close-up range. This enables the user to interact with displayed content at various distances. In this paper we introduce bimanual interaction techniques that enable users to manipulate virtual content with the suitable accuracy. The separated-cursors technique differentiates between the manipulation tasks while the connected-cursors technique allows performing the manipulation tasks simultaneously. We consider three relative mapping methods which map the physical hand motion to relative virtual object motion depending on the user-display distance (interaction scaling). Mapping is based on a continuous distance-related mapping factor or predefined mapping factors. We evaluated the separated-cursors technique with and without interaction scaling. The explorative study indicates that a distance-related continuous mapping factor performs better than predefined mapping factors. Furthermore, the participants often needed fewer object selections to sort objects with interaction scaling. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Mapping

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Automatic Human Age Estimation Using Overlapped Age Groups

Automatic Human Age Estimation Using Overlapped Age Groups

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7th international Joint conference on computer Vision, imaging and computer graphics Theory and Applications, VISIGRAPP 2012

作者： Kilinc, Merve Akgul, Yusuf Sinan TUBITAK - BILGEM 41470 Kocaeli Turkey GIT Vision Lab. Department of Computer Engineering Gebze Institute of Technology 41400 Kocaeli Turkey

ISBN: (纸本)9783642382406

Facial aging effects can be perceived in two main forms;the first one is the growth related transformations and the second one is the textural variations. Therefore, in order to generate an efficient age classifier, both shape and texture information should be used together. In this work, we present an age estimation system that uses the fusion of geometric features (ratios of distance values between facial landmark points) and textural features (filter responses of the face image pixel values). First the probabilities of a face image belonging to each overlapping age groups are calculated by a group of classifiers. Then an interpolation based technique is used to produce the final estimated age. Many different textural features and geometric features were compared in this study. The results of the experiments show that the fusion with the geometric features increases the performance of the textural features and the highest age estimation rates are obtained using the fusion of Local Gabor Binary Patterns and Geometric features with overlapping age groups. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Local binary pattern

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Real-Time Label visualization in Massive CAD Models

Real-Time Label Visualization in Massive CAD Models

引用

IEEE international conference on computer-Aided Design and computer graphics

作者： Renato Deris Prado Alberto Barbosa Raposo Tecgraf Institute Pontifical Catholic University of Rio de Janeiro Rio de Janeiro Brazil

Virtual Labels are used in computer graphics applications to represent textual information arranged on geometric surfaces. Such information consists of names, numbering, or other relevant data that need to be noticed quickly when a user scans the objects in the scene. This paper focuses on the so-called massive models, which have a large number of geometric primitives whose rendering presents a high computational cost and for which conventional texturing techniques can extrapolate the available computational resources. In this work we have developed a way to view, in real time, virtual labels with different information on the surfaces of objects in massive models. The technique is implemented entirely on the GPU, and shows no significant loss of performance and low memory cost. CAD models' objects are the main focus of the work, although the solution can be used in other types of objects once their texture coordinates are adjusted correctly.

关键词： Solid modeling Geometry Indexes Rendering (computer graphics) Design automation Mathematical model Real-time systems

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Advances in Visual Informatics: Third international Visual Informatics conference, IVIC 2013, Selangor, Malaysia, November 13-15, 2013. Proceedings 1

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丛书名： Lecture Notes in computer Science 8237

2013年

作者： Raul A. Herrera-Acuña, Vasileios Argyriou, Sergio A. Velastin (auth.), Halimah Badioze Zaman, Peter Robinson, Patrick Olivier, Timothy K. Shih, Sergio Velastin (eds.)

ISBN: (数字)9783319029580

ISBN: (纸本)9783319029573;9783319029580

This book constitutes the refereed proceedings of the Third international conference on Advances in Visual Informatics, IVIC 2013, held in Selangor, Malaysia, in November 2013. The four keynotes and 69 papers presented were carefully reviewed and selected from various submissions. The papers focus on four tracks: computer visions and engineering; computer graphics and simulation; virtual and augmented reality; and visualization and social computing.

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VACT: visualization-Aware CT Reconstruction

VACT: Visualization-Aware CT Reconstruction

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IEEE Nuclear Science Symposium

作者： Ziyi Zheng Klaus Mueller Computer Science Department Stony Brook University NY

Computed tomography (CT) reconstruction methods are often unaware of the requirements of the subsequent 3D volume visualization stage. In this stage, a delicate and often-studied component is the interpolation of off-grid samples, where aliasing can lead to misleading artifacts and blurring, potentially hiding fine details of critical importance. The visualization-aware CT reconstruction framework we describe aims to account for these errors directly in the volume generation stage. Our framework informs the CT reconstruction process of the specific filter intended for interpolation in the subsequent visualization process, and this in turn ensures an accurate interpolation there at a set tolerance. Here, we focus on fast trilinear interpolation in conjunction with an octree-type mixed resolution volume representation without T-junctions. Efficient rendering is achieved by a space-efficient and locality-optimized representation, which can straightforwardly exploit fast fixed-function pipelines on GPUs.

关键词： Computed tomography Rendering (computer graphics) Interpolation Data visualization Image reconstruction Pipelines Image resolution

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