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Tele-3d - developing a handheld scanner using structured light projection 1

Tele-3D - Developing a handheld scanner using structured lig...

引用

1st international symposium on 3d data processing visualization and transmission

作者： Ferreira, JF Lobo, J dias, J Univ Coimbra Inst Syst & Robot Coimbra Portugal

ISBN: (纸本)0769515223

Three-dimensional surface reconstruction from two-dimensional images is a process with great potential for use on different fields of research, commerce and industrial production. In this article we will describe the evolution of a project comprising the study and development of systems which implement the aforementioned process, exploring several techniques with the final aim of devising the best possible compromise between flexibility, performance and cost-effectiveness. We will firstly focus our attention on past work, namely the description of the implementation and results of a fixed system involving a camera and a laser-stripe projector mounted on a pan-tilt unit which sweeps the surface vertically with a horizontal stripe. Then we will describe our current work on the development of a fully portable, handheld system using cameras, projected structured light and inertial/magnetic positioning and attitude sensors - the Tele-3d scanner.

关键词： Cameras

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Automated multi-view 3d image acquisition in human genome research 1

Automated multi-view 3D image acquisition in human genome re...

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1st international symposium on 3d data processing visualization and transmission

作者： Kozubek, M Matula, P Eipel, H Hausmann, M Masaryk Univ Fac Informat Lab Opt Microscopy Brno 60200 Czech Republic

ISBN: (纸本)0769515215;0769515223

One of the main problems of 3d imaging in optical microscopy is unisotropic optical resolution of acquired 3d data. For instance in confocal laser scanning microscopy, axial resolution is 2-3 times worse than the lateral one. A sophisticated solution of this problem is so-called micro axial tomography that provides a good means for microscopic image acquisition of cells or subcellular components like cell nuclei with an improved resolution achieved by object tilting and acquisition of a series of mutually tilted 3d image data. Since the very early developments of micro axial tomography a considerable drawback of this method was a complicated image acquisition and processing procedure that requires much operator time. In order to solve this problem advanced microscopy and automated computer image acquisition and analysis were brought together. Special software that drives all hardware components required for automated micro axial tomography was developed. It performs multi-view 3d image acquisition as well as related image processing.

关键词： Tomography

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Construction of large-scale virtual environment by fusing range data, texture images, and airborne altimetry data 1

Construction of large-scale virtual environment by fusing ra...

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1st international symposium on 3d data processing visualization and transmission

作者： Gunadi, CR Shimizu, H Kodama, K Aizawa, K Univ Tokyo Grad Sch Engn Grad Sch Frontier Sci Bunkyo Ku Tokyo 1138656 Japan

ISBN: (纸本)0769515223

Construction of large-scale virtual environment is gaining more attentions for its applications in virtual mall, virtual sightseeing, tele-presence, etc. We introduce a framework to construct realistic large-scale virtual environment by fusing range data, texture images, and airborne altimetry data. First, realistic and high-precision 3-d models of buildings are created from range data and texture images. Next, rough 3-d models of buildings in wide area are created using altimetry data acquired by airborne laser profiler Finally, these models are integrated to build a large-scale realistic walk-through system. This paper describes the proposed system, part of its implementations, as well as future works that still have to be done.

关键词： Image texture

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Improvement of metric accuracy of digital 3d models through digital photogrammetry. A case study: donatello's Maddalena 1

Improvement of metric accuracy of digital 3D models through ...

引用

1st international symposium on 3d data processing visualization and transmission

作者： Beraldin, JA Guidi, G Ciofi, S Atzeni, C Natl Res Council Canada IIT Ottawa ON Canada Univ Florence DET Florence Italy

ISBN: (纸本)0769515215;0769515223

In spite of an undoubted richness of information produced by 3d optical technologies, in some cases, the method for generating a digital model from single 3d acquisitions involves the propagation of errors. These errors limit the overall metric accuracy attainable with such procedure. This happens when small 3d images are assembled together in order to model a large object. The authors present a procedure by which the metric reliability of the 3d model, obtained through iterative alignments of single range maps, can be guaranteed to an acceptable level. For this purpose, non-impeding optical targets were specifically designed for placement around the object. These are measured using a close range digital photogrammetry technique and by the 3d range camera system. From these measurements, transformation matrices have been calculated. Each matrix allows for the roto-translation (pose) of the 3d images from the local coordinate system of the range camera to an accurate global coordinate system determined by the digital photogrammetric procedure.

关键词： Iterative methods

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A tensor voting approach for the hierarchical segmentation of 3-d acoustic images 1

A tensor voting approach for the hierarchical segmentation o...

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1st international symposium on 3d data processing visualization and transmission

作者： Tao, LM Murino, V Medioni, G Univ Verona Dipartimento Informat I-37134 Verona Italy

ISBN: (纸本)0769515223

We present a hierarchical and robust algorithm addressing the problem of filtering and segmentation of three-dimensional acoustic images. This algorithm is based on the tensor voting approach - a unified computational framework for the inference of multiple salient structures. Unlike most previous approaches, no models or prior information of the underwater environment, nor the intensity information of acoustic images is considered in this algorithm. Salient structures and outlier noisy points are directly clustered in two steps according to both the density and the structural information of input data. Our experimental trials show promising results, very robust despite the low computational complexion.

关键词： Tensors

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data processing algorithms for generating textured 3d building facade meshes from laser scans and camera images 1

Data processing algorithms for generating textured 3D buildi...

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1st international symposium on 3d data processing visualization and transmission

作者： Früh, C Zakhor, A Univ Calif Berkeley Dept Elect Engn & Comp Sci Video & Imaging Proc Lab Berkeley CA 94720 USA

ISBN: (纸本)0769515215;0769515223

In this paper, we develop a set of data processing algorithms for generating textured facade meshes of cities from a series of vertical 2d surface scans, obtained by a laser scanner while driving on public roads under normal traffic conditions. These processing steps are needed to cope with imperfections and non-idealities inherent in laser scanning systems such as occlusions and reflections from glass surfaces. The driven path is cut into easy-to-handle quasi-linear segments with approximately straight driving direction. The vertical scans in each segment are recorded in a sequential topological order, and are transformed into a depth image;if available, additional 3d data from other modalities such as stereo vision is also taken into consideration. dominant building structures are detected in the depth images, and points are classified into foreground and background layers. Large holes in the background layer, caused by occlusion from foreground layer objects, are filled in by planar or horizontal interpolation. The depth image is further processed by removing isolated points and filling remaining small holes, to obtain a textured surface mesh. We apply the above steps to a large set of data with several million 3d points, and show photorealistic texture mapped 3d models.

关键词： 3d city model depth image occlusion image restauration urban simulation

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Visualizing I/O predictability 1

Visualizing I/O predictability

引用

1st international symposium on 3d data processing visualization and transmission

作者： Luo, A Amer, A Speidel, S Long, ddE Pang, A Univ Calif Santa Cruz Jack Baskin Sch Engn Santa Cruz CA 95064 USA

ISBN: (纸本)0769515215;0769515223

We propose a novel method to study storage system predictability based on the visualization of file successor entropy, a form of conditional entropy drawn from a file access trace. First-order conditional entropy can be used as a measure of predictability. It is superior to the more common measures such as independent likelihood of data access. For file access data, we developed a visualization tool that produces 3d graphical views of the variation in predictability of successive access events on a per-file basis. Our visualization tool provides interactive observation of the variations in predictability according to some arbitrary criterion, e.g. time of day, program identifier, user groups, or an), other classification of files. Four entropy data sets were extracted from various file system traces. These four data sets are representative of the variability in file access patterns for different machine use: server personal workstation, large number of interactive users, and heavy write activity. visualization results show that there is strong predictability among files and optimizations would be profitable.

关键词： conditional entropy file access trace data access patterns caching effects

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f3d - A file format an tools for storage an manipulation of volumetric data sets 1

f3d - A file format an tools for storage an manipulation of ...

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1st international symposium on 3d data processing visualization and transmission, 3dPVT 2002

作者： Šrámek, M. dimitrov, L.I. Commission for Scientific Visualization Austrian Academy of Sciences Donau-City-Str. 1 ViennaA-1220 Austria

ISBN: (纸本)0769515215

different file formats for storage and manipulation of volumetric data exist today, but none of them has been accepted as a standard by the volume visualization and volume graphics communities until now. This paper tries to change this situation by proposing a new, freely available file format f3d, which, as we believe, fulfills the demands of research and educational environments. We hope that this new format will be accepted by the above mentioned communities and thus will provide a basis for improved communication between different groups and applications. © 2002 IEEE.

关键词： data visualization

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Architecture of a 3d-simulation environment for active vision systems and mobile robots 1

Architecture of a 3D-simulation environment for active visio...

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1st international symposium on 3d data processing visualization and transmission

作者： Baudry, A Bungenstock, M Mertsching, B Univ Hamburg Dept Informat IMA Lab Hamburg Germany

ISBN: (纸本)0769515223

Working with active vision-systems, users often have to simulate particular environments in which the), can undertake experiments with virtual sensors. In such artificial environments all parameter settings have to be fully controllable. Thus a simulation framework based on a component oriented concept will be proposed in order to facilitate the integration of arbitrary simulation modules, e.g. particular sensors, environmental artifacts and even additional platforms for robots. The introduced system aims at enabling visual simulation state-monitoring. It also provides interfaces which are identical to those of hardware platforms already in use. This ensures that existing active vision or robotic applications can use the simulator in the same way. Although it is not intended to replace the real system completely, this application does represent an important addition to the system for both research and teaching purposes.

关键词： Computer vision

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Second order local analysis for 3d reconstruction of specular surfaces 1

Second order local analysis for 3D reconstruction of specula...

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1st international symposium on 3d data processing visualization and transmission

作者： Savarese, S Chen, M Perona, P CALTECH Pasadena CA 91125 USA

ISBN: (纸本)0769515223

We analyze the problem of recovering the shape of a mirror surface. A calibrated scene composed of lines passing through a point is assumed. The lines are reflected by the mirror surface onto the image plane of a calibrated camera, where the intersection, orientation and curvature of such reflections are measured. The relationship between the local geometry of the surface around the point of reflection and the measurements is analyzed. We extend the analysis in [13, 14], where we recovered positions and normals and second order local geometry of a specular surface up to one unknown parameter We show that, provided that we work in a neighborhood of a surface whose third order surface terms can be neglected, the second order parameter ambiguity can be solved by equating the curvatures observed for the reflected lines with those computed from analytical differentiation followed by a perspective projection.

关键词： Image reconstruction

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