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Query tools for interactive exploration of 3D neuroimages: Cropping, probe and lens

Query tools for interactive exploration of 3D neuroimages: C...

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2013 26th Conference on graphics, Patterns and images, SIBGRAPI 2013

作者： Wu, Shin-Ting Vidalon, Jose Elias Yauri Loos, Wallace Souza Coan, Ana Carolina School of Electrical and Computer Engineering University of Campinas Campinas Brazil School of Medical Sciences University of Campinas Campinas Brazil

ISBN: (纸本)9780769550992

Dynamic queries continuously update the data that is visualized in accordance with the user actions. They are typically applied for visual information seeking. This paper proposes to introduce this interaction style for exploring 3D medical neuroimages in its original form, enhancing visual seeking technology in a medical diagnostic procedure. More precisely, we present three dynamic query tools that allow the user to change the focus on-the-fly, while the surrounding tissue is preserved. They are a curvilinear cropper, a volumetric probe and a movable magnifying lens. Once information-preserving visualization is essential for accurate diagnosis and legal protection, the dataset is in its original form. The originality of our work relies on the input interface through which an expert can directly manipulate those tools on the raw data and the responsiveness of each displayed voxel by exploiting the power of GPUs. The proposed techniques have been integrated in a visualization prototype and were assessed by the neuroimaging experts, who were be able to identify subtle lesions in the brain. © 2013 IEEE.

关键词： Probes

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A new method for static video summarization using local descriptors and video temporal segmentation

A new method for static video summarization using local desc...

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2013 26th Conference on graphics, Patterns and images, SIBGRAPI 2013

作者： Cahuina, Edward J.Y. Cayllahua Chavez, Guillermo Camara Computer Research Center San Pablo Catholic University Arequipa Peru Department of Computer Science Federal University of Ouro Preto Ouro Preto Brazil

ISBN: (纸本)9780769550992

The continuous creation of digital video has caused an exponential growth of digital video content. To increase the usability of such large volume of videos, a lot of research has been made. Video summarization has been proposed to rapidly browse large video collections. To summarize any type of video, researchers have relied on visual features contained in frames. In order to extract these features, different techniques have used local or global descriptors. In this paper, we propose a method for static video summarization that can produce meaningful and informative video summaries. We perform an evaluation using over 100 videos in order to achieve a stronger position about the performance of local descriptors in semantic video summarization. Our experimental results show, with a confidence level of 99%, that our proposed method using local descriptors and temporal video segmentation produces better summaries than state of the art methods. We also demonstrate the importance of a more elaborate method for temporal video segmentation, improving the generation of summaries, achieving 10% improvement in accuracy. We also acknowledge a marginal importance of color information when using local descriptors to produce video summaries. © 2013 IEEE.

关键词： Semantics

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Acceleration Methods for Radiance Transfer in Photorealistic Augmented Reality

Acceleration Methods for Radiance Transfer in Photorealistic...

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12th IEEE and ACM International symposium on Mixed and Augmented Reality - Arts, Media, and Humanities (ISMAR-AMH)

作者： Gruber, Lukas Sen, Pradeep Hoellerer, Tobias Schmalstieg, Dieter Graz Univ Technol A-8010 Graz Austria Univ Calif Santa Barbara Santa Barbara CA 93106 USA

ISBN: (纸本)9781479928699

Radiance transfer computation from unknown real-world environments is an intrinsic task in probe-less photometric registration for photorealistic augmented reality, which affects both the accuracy of the real-world light estimation and the quality of the rendering. We discuss acceleration methods that can reduce the overall ray-tracing costs for computing the radiance transfer for photometric registration in order to free up resources for more advanced augmented reality lighting. We also present evaluation metrics for a systematic evaluation.

关键词： H.5.1 [Information Interfaces and Presentation]: Artificial, Augmented, Virtual Realities I.4.8 [image processing and computer Vision]: Photometric registration-3D Reconstruction I.3.3 [computer graphics]: image Generation Ray Tracing-Spherical Harmonics

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A CPU, GPU, FPGA System for X-ray image processing using High-speed Scientific Cameras

A CPU, GPU, FPGA System for X-ray Image Processing using Hig...

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25th International symposium on computer Architecture and High Performance Computing (SBAC-PAD)

作者： Delazari Binotto, Alecio Pedro Doering, Dionisio Stetzelberger, Thorsten McVittie, Patrick Zimmermann, Sergio Pereira, Carlos Eduardo Univ Calif Berkeley Lawrence Berkeley Natl Lab Berkeley CA 94720 USA UFRGS Fed Univ Rio Grande do Sul Porto Alegre RS Brazil IBM Res Brazil Sao Paulo Brazil

ISBN: (纸本)9781479929276

Currently, computers can be composed of different processing Units (PUs) - general-purpose and also programmable and specialist-purpose. One of the goals for such heterogeneity is to improve applications' performance. Particularly, scientific applications can highly benefit from this kind of platform. They produce large amounts of data within several types of algorithms;and distinct PUs are an alternative to better execute such tasks. This work presents a new system box - composed of CPU, GPU, and FPGA - to carry on site X-ray image evaluations. It was firstly tested by evaluating the performance of a Linear Integration (LI) algorithm over the PUs. This algorithm is largely used by synchrotron experiments in which high-speed X-ray cameras produce extremely large amounts of data for post-processing analysis, which includes performing LI. In our experiments, LI execution was around 30x faster in FPGA compared to CPU, achieving a similar performance to GPU. Taking the end-to-end application, i.e, image transfer into memory, this rate increases to hundreds. Issues for using FPGAs as a co-processor under our dynamic scheduling framework is also discussed. Synthesizing times for LI when assigned to FPGA are still too long for dynamic scheduling, preventing online synthesizing of functions not designed a priori.

关键词： GPU FPGA High-speed x-ray cameras Heterogeneous systems Dynamic scheduling Linear integration

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Evaluation of Depth of Field for Depth Perception in DVR

Evaluation of Depth of Field for Depth Perception in DVR

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6th IEEE symposium on Pacific Visualization (PacificVis)

作者： Grosset, A. V. Pascal Schott, Mathias Bonneau, Georges-Pierre Hansen, Charles D. Univ Utah Sch Comp Salt Lake City UT 84112 USA Univ Utah Sci Inst Salt Lake City UT 84112 USA Univ Utah NVIDIA Sch Comp Salt Lake City UT 84112 USA Univ Utah NVIDIA Sch Comp Salt Lake City UT 84112 USA Univ Grenoble INRIA LJK Grenoble France

ISBN: (纸本)9781467347976

In this paper we present a user study on the use of Depth of Field for depth perception in Direct Volume Rendering. Direct Volume Rendering with Phong shading and perspective projection is used as the baseline. Depth of Field is then added to see its impact on the correct perception of ordinal depth. Accuracy and response time are used as the metrics to evaluate the usefulness of Depth of Field. The onsite user study has two parts: static and dynamic. Eye tracking is used to monitor the gaze of the subjects. From our results we see that though Depth of Field does not act as a proper depth cue in all conditions, it can be used to reinforce the perception of which feature is in front of the other. The best results (high accuracy & fast response time) for correct perception of ordinal depth occurs when the front feature (out of the two features users were to choose from) is in focus and perspective projection is used.

关键词： I.3.7 [computer graphics]: Three-Dimensional graphics and Realism Color, shading, shadowing and texture I.3.m [computer graphics]: Miscellaneous I. 4.10 [ image processing and computer Vision]: image Representation Volumetric

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A surface smoothing method for a 3D model of a medical object

A surface smoothing method for a 3D model of a medical objec...

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International symposium on Biomedical Engineering and Medical Physics, ISBEMP 2012

作者： Kovalovs, M. Sisojevs, A. Glazs, A. Riga Technical University Department of Image Processing and Computer Graphics Meza Street 1/3 Riga Latvia

ISBN: (纸本)9783642341960

This paper describes a method to smoothen the surface of a Medical object's 3D model. This method is intended to be used on model that was obtained by a triangulation algorithm, but it also can be used on a model that was obtained by a marching cubes algorithm. The basic principle behind this algorithm is that it adjusts the position of the vertices of a 3D model relative to the neighboring vertices, thus evening the rough edges. This method was tested on the model of human head, which was acquired by computer tomography and it showed considerable visual improvement of the model. © 2013 IFMBE.

关键词： Three dimensional computer graphics

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Real-time Stereo Vision: Optimizing Semi-Global Matching

Real-time Stereo Vision: Optimizing Semi-Global Matching

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IEEE Intelligent Vehicles symposium

作者： Michael, Matthias Salmen, Jan Stallkamp, Johannes Schlipsing, Marc Ruhr Univ Bochum Inst Neuroinformat D-44780 Bochum Germany

ISBN: (纸本)9781467327541

Semi-Global Matching (SGM) is arguably one of the most popular algorithms for real-time stereo vision. It is already employed in mass production vehicles today. Thinking of applications in intelligent vehicles (and fully autonomous vehicles in the long term), we aim at further improving SGM regarding its accuracy. In this study, we propose a straight-forward extension of the algorithm's parametrization. We consider individual penalties for different path orientations, weighted integration of paths, and penalties depending on intensity gradients. In order to tune all parameters, we applied evolutionary optimization. For a more efficient offline optimization and evaluation, we implemented SGM on graphics hardware. We describe the implementation using CUDA in detail. For our experiments, we consider two publicly available datasets: the popular Middlebury benchmark as well as a synthetic sequence from the. enpeda. project. The proposed extensions significantly improve the performance of SGM. The number of incorrect disparities was reduced by up to 27.5% compared to the original approach, while the runtime was not increased.

关键词： computer graphics image matching parallel architectures real-time systems stereo image processing

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A virtually tangible 3D interaction system using an autostereoscopic display 13

A virtually tangible 3D interaction system using an autoster...

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1st ACM symposium on Spatial User Interaction, SUI 2013

作者： Kusano, Takumi Niikura, Takehiro Komuro, Takashi Saitama University 255 Shimo-Okubo Sakura-Ku Saitama City Saitama Japan University of Tokyo Hongo 7-3-1 Bunkyo-Ku Tokyo Japan

ISBN: (纸本)9781450321419

关键词： Stereo image processing

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A Framework for Immersive VR and Full-Body Avatar Interaction

A Framework for Immersive VR and Full-Body Avatar Interactio...

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20th IEEE Virtual Reality Conference (VR)

作者： Camporesi, Carlo Kallmann, Marcelo Univ Calif Sch Engn Merced CA 95343 USA

ISBN: (纸本)9781467347969;9781467347952

We present a new software framework for the development of immersive collaborative virtual reality applications with emphasis on full-body interaction with virtual humans. The framework is designed to be scalable and adaptable to different hardware configurations, using either commodity or more expensive hardware setups. High level programming abstractions handle object replication and communication channels for configurations based on multiple rendering nodes. The system provides tools for full-body character animation, real-time full-body tracking and retargeting to virtual humans, including motion reconstruction from a small set of sensors. Such capabilities allow new full-body interaction metaphors to be developed in fixed or user-perspective stereo visualization. The framework is scalable, customizable, cross-platform and it is only based on tools with source code available.

关键词： avatars computer animation data visualisation groupware image motion analysis image reconstruction object tracking programming rendering (computer graphics) stereo image processing

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Re-identifying people based on indexing structure and manifold appearance modeling

Re-identifying people based on indexing structure and manifo...

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2013 26th Conference on graphics, Patterns and images, SIBGRAPI 2013

作者： Dutra, Cristianne R.S. Schwartz, William Robson Souza, Tiago Alves, Raul Oliveira, Luciano Department of Computer Science Universidade Federal de Minas Gerais UFMG Belo Horizonte-MG 31270-901 Brazil Dept. of Computer Science Intelligent Vision Research Lab Federal University of Bahia Salvador Brazil

ISBN: (纸本)9780769550992

The role of person re-identification has increased in the recent years due to the large camera networks employed in surveillance systems. The goal in this case is to identify individuals that have been previously identified in a different camera. Even though several approaches have been proposed, there are still challenges to be addressed, such as illumination changes, pose variation, low acquisition quality, appearance modeling and the management of the large number of subjects being monitored by the surveillance system. The present work tackles the last problem by developing an indexing structure based on inverted lists and a predominance filter descriptor with the aim of ranking candidates with more probability of being the target search person. With this initial ranking, a more strong classification is done by means of a mean Riemann covariance method, which is based on a appearance strategy. Experimental results show that the proposed indexing structure returns an accurate short-list containing the most likely candidates, and that manifold appearance model is able to set the correct candidate among the initial ranks in the identification process. The proposed method is comparable to other state-of-the-art approaches. © 2013 IEEE.

关键词： Cameras

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