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3d reconstruction of industrial sheetmetal parts with hybrid point-line photogrammetry

3D reconstruction of industrial sheetmetal parts with hybrid...

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3rd international symposium on Multispectral Image processing and Pattern Recognition

作者： Zhang, YJ Zhang, ZX Zhang, JQ Huazhong Univ Sci & Technol Coll Hydropower & Informat Engn Wuhan Peoples R China

ISBN: (纸本)0819451819

A new approach for three-dimensional reconstruction of industrial parts with non-metric image sequences and hybrid point-line photogrammetry is proposed. Non-metric image sequence and CAd-designed data are used as source of information. The strategy of our approach is to reconstruct the parts automatically with points and line segments extracted from imagery. Hybrid point-line photogrammetry is used to reconstruct sheetmetal parts accurately, and the reconstructed model can be used for visualization and inspection. The reconstruction system can run automatically and fastly, and the output of hybrid point-line photogrammetry is the final 3d geometric model of the part. Results of real images of several parts are very satisfying, which shows a promising potential in automatic 3d reconstruction of widely existed industrial parts mainly composed of points and lines.

关键词： image sequence least squares template matching hybrid point-line photogrammetry 3d reconstruction

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Small CPU times and fast interactivity in sonar seabottom surveys

Small CPU times and fast interactivity in sonar seabottom su...

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2nd international symposium on 3d data processing, visualization, and transmission (3dPVI 2004)

作者： Loke, RE du Buf, JMH Univ Algarve Dept Elect & Comp Sci Vis Lab P-8000810 Faro Portugal

ISBN: (纸本)0769522238

Sonar profiling of the seabottom provide 3d data sets that can cover huge survey areas with many gaps. This paper describes a multiresolution framework or visualization pipeline that is being optimized for dealing with such data, taking into account both the CPU time and the user interactivity. This paper describes the techniques employed: (a) the construction of a quadtree that allows to eliminate gaps by interpolating available 3d data, (b) a first but coarse visualization at a high tree level in order to rapidly change or adjust the region of interest, and (c) a very efficient triangulation (mesh reduction) that allows for a fast interactivity even at the highest detail level. By using one single octree, all processing can be combined because (1) gaps can be filled by interpolation since they are smaller at higher tree levels, and (2) connected components can be projected down the tree and refined using the data available there. As a result, huge data sets can be visualized in near realtime on normally-sized discrete grids using shading instead of wire-frames, and this enables a fast searching for objects in the seabottom. Real CPU times are presented for a real sonar data set which is visualized at a low resolution, showing the overall shape of the seabottom, and at a high resolution, showing a (semi-)buried pipeline. In order to detect an object at such a high resolution additional techniques are applied to the data: (a) an interslice interpolation in order to cope with the increased data sparseness and (b) a maximum-homogeneity filtering in order to cope with the decreased signal-to-noise-ratio. After the extraction of the pipeline a thinning technique is applied in order to be able to quantify its length.

关键词： oceanic engineering sonar applications sonar imaging/ mapping sparse data volumetric interpretation volume visualization volumetric reconstruction multiresolution analysis interpolation segmentation surface fitting rendering

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3d model retrieval based on 2d slice similarity measurements

3D model retrieval based on 2D slice similarity measurements

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2nd international symposium on 3d data processing, visualization, and transmission (3dPVI 2004)

作者： Pu, JT Liu, Y Xin, GY Zha, HB Liu, WB Uehara, Y Peking Univ Natl Lab Machine Percept Beijing 100871 Peoples R China

ISBN: (纸本)0769522238

In this paper, we present an approach based on 2d slices for measuring similarity between 3d models. The key idea is to represent the 3d model by a series of slices along certain directions so that the shape-matching problem between 3d models is transformed into similarity measuring between 2d slices. Here, we have to deal with the following problems: selection of cutting directions, cutting methods, and similarity measuring. To solve these problems, some strategies and rules are proposed. Firstly, a maximum normal distribution method is presented to get three ortho-axes that coincide better with human visual perception mechanism. Secondly, a cutting method is given which can be used to get a series of slices composed of a set of closed polygons. Thirdly, on the basis of 3d shape distribution method presented by Robert et al., we develop a 2d shape distribution method to measure the similarity between the 2d slices. Some experiments are given in this paper to show the validity of this method for 3d model retrieval.

关键词： Image retrieval

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Real-time speech-driven 3d face animation 1

Real-time speech-driven 3D face animation

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

作者： Hong, PY Wen, Z Huang, TS Shum, HY Univ Illinois Coordinated Sci Lab Urbana IL 61801 USA

ISBN: (纸本)0769515215;0769515223

In this paper, we present an approach for real-time speech-driven 3d face animation using neural networks. We first analyze a 3d facial movement sequence of a talking subject and learn a quantitative representation of the facial deformations, called the 3d Motion Units (MUs). A 3d facial deformation can be approximated by a linear combination of the MUs weighted by, the MU parameters (MUPs) - the visual features of the facial deformation. The facial movement sequence synchronizes with a audio track. The audio track is digitized and the audio features of each frame are calculated. A real-time audio-to-MUP mapping is constructed by training a set of neural networks using the calculated audio-visual features. The audio-visual features are divided into several groups based on the audio features. One neural network is trained per group to map the audio features to the corresponding MUPs. Given a new audio feature vector, we first classify it into one of the groups and select the corresponding neural network to map the audio feature vector to MUPs, which are used for face animation. The quantitative evaluation shows the effectiveness of the proposed approach.

关键词： deformation

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Using principal curvatures and darboux frame to recover 3d geometric primitives from range images 1

Using principal curvatures and Darboux frame to recover 3D g...

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

作者： Hameiri, E Shimshoni, I Technion Israel Inst Technol Dept Comp Sci IL-32000 Haifa Israel

ISBN: (纸本)0769515223

We present a method for the recovery of partially occluded 3d geometric primitives from range images which might also include non-primitive objects. The method uses a technique for estimating the principal curvatures and darboux frame from range images which we developed. After estimating the principal curvatures and the darboux frames from the entire scene, a search for the known patterns of these features in geometric primitives, is performed. If a specific pattern is identified then the presence of the corresponding primitive is confirmed using these local features. The features are also used to recover the primitive's characteristics. The suggested application is very efficient since it combines the segmentation, classification and fitting processes, which are part of any recovery process, in a single process, which advances monotonously through the recovery procedure. The combined process does not use any least-squares fittings and therefore is very robust to inaccuracies in the local feature extraction process and to errors in segmentation. It was tested on series of real complex cluttered scenes, yielding accurate and robust recoveries of primitives.

关键词： Recovery

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Packet loss protection of scalable video bitstreams using forward error correction and feedback 3

Packet loss protection of scalable video bitstreams using fo...

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3rd international symposium on Image and Signal processing and Analysis (ISPA)

作者： Charfi, Y Hamzaoui, R Univ Konstanz Dept Comp & Informat Sci D-78457 Constance Germany

ISBN: (纸本)953184061X

We propose a system for packet loss protection of quality scalable video coders. The compressed bitstream is composed of a non-scalable base layer and an embedded enhancement layer as in MPEG4-Fine Granularity Scalability (FGS) and the emerging H26L-FGS. But the system can also be used with embedded video bitstreams like the 3d-SPIHT bitstream. Our system allocates a given transmission bitrate between the base layer bitstream and the enhancement layer bitstream in an efficient way using feedback. The base layer is protected with equal packet loss protection. For the enhancement layer, unequal packet loss protection is used to provide graceful degradation of video quality in the presence of packet erasure. Preliminary results for a hypothetical operational distortion-rate function and the 3d-SPIHT video coder show promising performance of the proposed system.

关键词： Bandwidth Bit rate degradation Feedback Forward error correction Image reconstruction Protection Rate-distortion Streaming media Video compression

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Compression of isosurfaces for structured volumes with context modelling 1

Compression of isosurfaces for structured volumes with conte...

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

作者： Saupe, d Kuska, JP Univ Konstanz D-7750 Constance Germany

ISBN: (纸本)0769515215;0769515223

In many applications surfaces with a large number of primitives occur. Geometry compression reduces storage space and transmission time for such models. A special case is given by polygonal isosurfaces generated from gridded volume data. However, most current state-of-the-art geometry compression systems do not capitalize on the structure that is characteristic of such isosurfaces, namely that the surfaces are defined by a set of vertices on edges of the grid. In a previous paper we proposed a compression method for isosurfaces that exploits this feature. In this paper we use the same coding approach, however, including context models for the encoding of the symbol streams. We report improved compression ratios for complex isosurfaces from a CT scan of a human head. Our coder outperformed state-of-the-art general purpose geometry compression methods. We also report results obtained by two predictive coding methods based on least squares function fitting and a surface relaxation algorithm.

关键词： Computerized tomography

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Hierarchical 3d surface reconstruction based on radial basis functions

Hierarchical 3D surface reconstruction based on radial basis...

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2nd international symposium on 3d data processing, visualization, and transmission (3dPVI 2004)

作者： dalmasso, P Nerino, R Ist Elettrotecnico Nazl Galileo Ferraris Turin Italy

ISBN: (纸本)0769522238

Volumetric methods based on implicit surfaces are commonly used in surface reconstruction from uniformly distributed sparse 3d data. The case of non-uniform distributed data has recently deserved more attention, because it occurs frequently in practice. This paper describes a volumetric approach to surface reconstruction from non-uniform data which is suitable for the reconstruction of surfaces from images, in particular from multiple views. differently from volumetric methods which use both 3d surface points and surface normals, the approach does not use the surface normals because they are often unreliable when estimated from image data. The method is based on a hierarchical partitioning of the volume data set. The working volume is split and classified at different scales of spatial resolution into surface, internal and external voxels and this hierarchy is described by an octree structure in a multiscale framework. The octree structure is used to build a multiresolution description of the surface by means of compact support radial basis functions (RBF). A hierarchy of surface approximations at different levels of details is built by representing the voxels at the same octree level as RBF of similar spatial support. At each scale, information related to the reconstruction error drives the reconstruction process at the following finer scale. Preliminary results on synthetic data and future perspectives are presented.

关键词： Image reconstruction

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Efficient algorithm fo the computation of 3d Fourier descriptors 1

Efficient algorithm fo the computation of 3D Fourier descrip...

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

作者： Sijbers, J. Van dyck, d. Vision Lab. University of Antwerp Groenenborgerlaan 171 U312 AntwerpB-2020 Belgium

ISBN: (纸本)0769515215

This work describes a new approach for the computation of 3d Fourier descriptors, which are used for characterization, classification, and recognition of 3d objects. The method starts with a polygonization of the object's surface. Next, a progressive mesh is constructed from the polyhedron using quadric-based polygonal surface simplification. Then, the same progressive mesh is exploited to efficiently reconstruct the original polyhedron onto the surface of a sphere, which is a necessary step for the computation of 3d Fourier descriptors. The mapping method is shown to be efficient and fast in projecting an arbitrarily shaped polyhedron onto a sphere surface. © 2002 IEEE.

关键词： Computational efficiency

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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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