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IEEE international symposium on Signal processing and Information Technology (ISSPIT)

作者： R. A Siddiqui S Eroksuz I Celasun Istanbul Technical University

To compress the large amount of point cloud data is emerging as the dire need for the visualization of scientific simulation and for rendering biomedical information. This work proposes a novel technique for the compression of point cloud volumetric and surface data. It is based upon multistage vector quantization (MSVQ) which is improvised for its application over 3d data. The clustering or initial codebook is generated with the help of hybridizing k-means clustering and grow and learn algorithm. The number of codevectors is determined with rate distortion constraint. Conclusively rate distortion analysis is also conducted for critical analysis of the algorithm

关键词： Vector quantization Clouds Geometry data visualization Rate-distortion data compression Clustering algorithms Signal processing algorithms Graphics Hardware

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Integrated circuit biosensors using living whole-cell bioreporters

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IEEE TRANSACTIONS ON CIRCUITS ANd SYSTEMS I-REGULAR PAPERS 2007年第1期54卷 89-98页

作者： Islam, Syed K. Vijayaraghavan, Rajagopal Zhang, Mo Ripp, Steven Caylor, Sam d. Weathers, Brandon Moser, Scott Terry, Stephen Blalock, Benjamin J. Sayler, Gary S. Univ Tennessee Dept Elect & Comp Engn Knoxville TN 37996 USA Univ Tennessee Ctr Environm Biotechnol Knoxville TN 37996 USA

A low-power CMOS bioluminescent bioreporter integrated circuit (BBIC) is designed and fabricated for use in electronic/biological chemical sensing. The bioreporters are placed on a CMOS integrated circuit (IC) that detects bioluminescence, performs signal processing and produces a digital output pulse with a frequency that is proportional to the concentration of the target substance. The digital output pulse that contains the sensor information can then be transmitted to a remote location either wirelessly or via a data cable. The basic building blocks of the integrated circuit are the microlumninometer and the transmitter. The microluminometer includes an integrated photodetector and a signal processor and is housed in a rugged inexpensive package that can be used in many remote applications in hazardous environmental monitoring. The total power consumption of the entire signal processing circuitry including the photodiodes is 3 mW from a 3.3-V power supply. This is lowered by a factor of 3 when compared to previous versions of the BBIC. In addition, it also integrates all features of detection, processing and data transmission into one small element. The bioreporter typically contains the luxCdABE reporter genes. The close proximity of the bioreporter and the sensing element eliminates the need for complex instrumentation to channel light from the bioreporters to the microluminometer. This paper presents an integrated CMOS microluminometer realized in 0.35-mu m CMOS process and optimized for the detection of low-level bioluminescence as part of the BBIC. A flow-through test system was designed to expose the BBIC system composed of the microluminometer and the bioreporter Pseudomonas fluorescens 5RL to salicylate for determination of analytical benchmark data. The results obtained from the experiment are currently being used to study enclosures and micro-environment configurations for field-deployable BBICs for environmental monitoring.

关键词： bioluminescent bioreporter integrated circuit (BBIC) bioreporters CMOS photodetectors microluminometer whole-cell biosensors

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A Study of Shape Similarity for Temporal Surface Sequences of People

A Study of Shape Similarity for Temporal Surface Sequences o...

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international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： Peng Huang Jonathan Starck Adrian Hilton Centre for Vision Speech and Signal Processing University of Surrey Guildford UK

The problem of 3d shape matching is typically restricted to static objects to classify similarity for shape retrieval. In this paper we consider 3d shape matching in temporal sequences where the goal is instead to find similar shapes for a single time-varying object, here the human body. Local- feature distribution descriptors are adopted to provide a rich object description that is invariant to changes in surface topology. Two contributions are made, (i) a comparison of descriptors for shape similarity in temporal sequences of a dynamic free-form object and (ii) a quantitative evaluation based on the Receiver-Operator Characteristic (ROC) curve for the descriptors using a ground-truth data set for synthetic motion sequences. Shape distribution [25], Spin Image [15], Shape Histogram [1] and Spherical Harmonic [17] descriptors are compared. The highest performance is obtained by volume-sampling shape-histogram descriptors. The descriptors also demonstrate relative in- sensitivity to parameter setting. The application is demonstrated in captured sequences of 3d human surface motion.

关键词： Humans Histograms databases Topology Animation Shape measurement Speech processing Signal processing Application software visualization

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FAST TEXTURE-BASEd TENSOR FIELd visualization FOR dT-MRI

FAST TEXTURE-BASED TENSOR FIELD VISUALIZATION FOR DT-MRI

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IEEE international symposium on Biomedical Imaging

作者： Tim Mcgraw Mariappan Nadar Department of CSEEMorgantown West Virginia University WV USA Imaging and Visualization Department Siemens AG Corporate Research and Development Princeton NJ USA

diffusion tensor MRI (dT-MRI) provides useful connectivity information about neuronal tissue, but has several visualization challenges. The high dimensional nature of the data (a 3d volume image with a matrix at each voxel) requires some processing to visualize on conventional 2d display devices. In this paper we present a novel approach to visualizing the tensor-valued data. Our approach requires minimal preprocessing and can be implemented and run much faster than other existing texture-based approaches. This is accomplished by using a hybrid approach, which has similarities to existing glyph, particle and texture-based visualization techniques. The resulting image is formed by blending textured billboards which are rendered at the center of each voxel in the dataset. Color, texture orientation, texture frequency and animation are used to convey diffusion properties. Results are presented for a dT-MRI image of a human brain.

关键词： Tensile stress diffusion tensor imaging Ellipsoids data visualization Anisotropic magnetoresistance Eigenvalues and eigenfunctions Rendering (computer graphics) Streaming media Magnetic resonance imaging Frequency

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Joint Reconstruction and Registration of a deformable Planar Surface Observed by a 3d Sensor

Joint Reconstruction and Registration of a Deformable Planar...

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international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： Umberto Castellani Vincent Gay-Bellile Adrien Bartoli VIPS University of Verona Italy CEA-LIST Saclay France LASMEA Clermont Ferrand France

We address the problem of reconstruction and registration of a deforming 3d surface observed by some 3d sensor giving a cloud of 3d points at each time instant. This problem is difficult since the basic data term does not provide enough constraints. We bring two main contributions. First, we examine a set of data and penalty terms that make the problem well-posed. The most important terms we introduce are the non- extensibility penalty and the attraction to boundary shape. Second, we show how the error function combining all these terms can be efficiently minimized with the Levenberg-Marquardt algorithm and sparse matrices. We report convincing results for challenging datasets coming from different kinds of 3d sensors. The algorithm is robust to missing and erroneous data points, and to spurious boundary detection.

关键词： Surface reconstruction Clouds Robustness Image reconstruction deformable models Facial animation Face detection Shape Sparse matrices Real time systems

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Fast Omnidirectional 3d Scene Acquisition with an Array of Stereo Cameras

Fast Omnidirectional 3D Scene Acquisition with an Array of S...

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international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： Jiajun Zhu Greg Humphreys david Koller Skip Steuart Rui Wang Department of Computer Science University of Virginia USA Steuart Systems Department of Computer Science University of Massachusetts USA

We present an omnidirectional 3d acquisition system based on a mobile array of high-resolution consumer digital SLR cameras that automatically capture high dynamic range stereo pairs across a full 360-degree panorama. The stereo pairs are augmented with a time-varying lighting pattern created using standard photographic flashes, lenses, and patterned slides. Spacetime stereo techniques are used to generate 3d range images with corresponding color data from the HdR photographs. The multiple range images are aligned with egomotion estimation and ICP registration techniques, and volumetric merging and color texturing algorithms allow the rapid creation of complete 3d models. The resulting system compares favorably with other state of the art 3d acquisition technologies in the resolution and quality of its output, and can be faster and less expensive than 3d laser scanners for digitizing large 3d scenes such as building interiors.

关键词： Layout digital cameras Laser modes Stereo image processing Image reconstruction Computer science dynamic range Lenses Laser theory Shape

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Mutual awareness in collocated and distant collaborative tasks using shared interfaces

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11th IFIP TC 13 international Conference on Human-Computer Interaction, INTERACT 2007

作者： Pauchet, A. Coldefy, F. Lefebvre, L. Louis dit Picard, S. Bouguet, A. Perron, L. Guerin, J. Corvaisier, d. Collobert, M. France Télécom R and D 2 Av. Pierre Marzin Lannion22307 France

ISBN: (纸本)9783540747949

Shared interface allowing several users in co-presence to interact simultaneously on digital data on a single display is an uprising challenge in Human Computer Interaction (HCI). Its development is motivated by the advent of large displays such as wall-screens and tabletops. It affords fluid and natural digital interaction without hindering human communication and collaboration. It enables mutual awareness, making participant conscious of each other activities. In this paper, we are interested in Mixed Presence Groupware (MPG), when two or more remote shared interfaces are connected for a distant collaborative session. Our contribution strives to answer to the question: Can the actual technology provide sufficient presence feeling of the remote site to enable efficient collaboration between two distant groups? We propose digiTable, an experimental platform we hope lessen the gap between collocated and distant interaction. digiTable is combining a multiuser tactile interactive tabletop, a video-communication system enabling eye-contact with real size distant user visualization and a spatialized sound system for speech transmission. A robust computer vision module for distant users’ gesture visualization completes the platform. We discuss first experiments using digiTable for a collaborative task (mosaic completion) in term of distant mutual awareness. Although digiTable does not provide the same presence feeling in distant and or collocated situation, a first and important finding emerges: distance does not hinder efficient collaboration anymore. © IFIP international Federation for Information processing 2007.

关键词： visualization

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Hybrid Scene Reconstruction by Integrating Scan data and Stereo Image Pairs

Hybrid Scene Reconstruction by Integrating Scan Data and Ste...

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international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： Xiangyin Ma Hongbin Zha State Key Laboratory of Machine Perception Peking University Beijing China

3d geometric models obtained by using laser scanners are often incomplete due to the equipment limitations. In this paper, we propose a novel hybrid reconstruction algorithm, which integrates stereo image pairs to overcome these limitations. This work focuses on a category of scenes that can be approximated by planes (such as manmade scenes). The scan data are first segmented into planar patches, many of which may be incomplete. Stereo image pairs are then incorporated to retrieve the missing data. Specifically, we decide each plane's extension in the image domain via segment-based stereo matching with disparity layers extracted from scan data. Then, points in the missing area are interpolated by calculating ray-plane intersections. All procedures are automatic except for the range to image registration. The validity of our approach is demonstrated by experiments on real data.

关键词： Layout Image reconstruction Stereo image processing Image segmentation Solid modeling Laser modes Reconstruction algorithms Information retrieval Image retrieval data mining

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First steps towards multimodal georeferencing of 3d VHR optical and X-band SAR imagery

First steps towards multimodal georeferencing of 3D VHR opti...

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IEEE international symposium on Geoscience and Remote Sensing (IGARSS)

作者： Antonella Belmonte dominique derauw Christian Barbier Jacques G. Verly Centre Spatial de Liège University of Liège Angleur Belgium Department of Electrical Engineering and Computer Science INTELSIG Group University of Liège Liege Belgium

With the advent of new, more widely available very high resolution (VHR) SAR and optical sensor satellite constellations, the issue of jointly exploiting the corresponding imaging data in the best possible way naturally arises. Our ultimate goal is the pixel-level fusion of these modalities and their visualization in a 3d context, i.e. draped over terrain data, itself obtained from interferometric SAR processing. In this paper, we investigate the issues associated with adapting tools originally developed for low-resolution C-band SAR imagery to high-resolution X-band SAR imagery (both spaceborne). Specifically, we consider the issues associated with SAR interferometry (InSAR) and more particularly those associated with complex interpolation and phase unwrapping. We found that the existing chirp-Z transform complex interpolator previously used at low resolution is perfectly suitable for handling VHR SAR data. We also found that, while the selected phase unwrapping procedure works well when the resolution is reduced by averaging, it is deficient at full resolution, in part due micro-reliefs and specific phase responses.

关键词： Optical interferometry Optical sensors Image resolution Satellite constellations High-resolution imaging Optical imaging data visualization Synthetic aperture radar interferometry Interpolation Chirp

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3d Challenges and a Non-In-depth Overview of Recent Progress

3D Challenges and a Non-In-Depth Overview of Recent Progress

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international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： Luc Van Gool Bastian Leibe Pascal Muller Maarten Vergauwen Thibaut Weise Swiss Federal Institute of Technology Switzerland Katholieke Universiteit Leuven Belgium D-ITET / BIWI Swiss Federal Institute of Technology Zurich Switzerland D-ITET / BIWI Swiss Federal Institute of Technology (ETH) Zürich Switzerland ESAT / PSI-VISICS Katholieke Universiteit Leuven Leuven Belgium

Although a lot of effort already went into the development of 3d acquisition technology, and existing methods come of age, several challenges remain. We try to give a - probably incomplete - overview of these. Then, some of our recent work at ETH Zurich and the University of Leuven is discussed, where we try to tackle such outstanding issues.

关键词： Cities and towns Reflectivity Inorganic materials Cultural differences Context modeling data mining Navigation Textiles Ceramics Glass

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