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检索条件"任意字段=3rd International Symposium on 3D Data Processing, Visualization and Transmission"

共 655 条记录，以下是151-160 订阅

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3d model watermarking for indexing using the generalized radon transform

3D model watermarking for indexing using the generalized rad...

引用

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

作者： daras, P Zarpalas, d Tzovaras, d Strintzis, MG Aristotle Univ Thessaloniki Dept Elect & Comp Engn Informat Proc Lab GR-54006 Thessaloniki Greece

ISBN: (纸本)0769522238

The present paper proposes a novel method for 3d-model watermarking for indexing. The proposed approach is based on the use of a Generalized Radon Transformation. More specifically, the Cylindrical Integration Transform (CIT) is initially applied to the 3d models in order to produce descriptor vectors. At the same time a watermarking technique, based on CIT is used in order to embed a specific model identifier in the nodes of the 3d model. This identifier links the model to its descriptor vector, which is extracted only once and stored in a database. Every time this model is employed as a query model, watermark detection is used so as to retrieve the corresponding identifier and further the descriptor vector, which can be further used in a matching algorithm. The proposed techniques are evaluated experimentally in terms of both watermarking efficiency and content-based retrieval performance.

关键词： digital watermarking

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A practical approach for 3d model indexing by combining local and global invariants 1

A practical approach for 3D model indexing by combining loca...

引用

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

作者： Vandeborre, JP Couillet, V daoudi, M ENIC Telecom Lille 1 INT MIIRE Grp F-59658 Villeneuve Dascq France

ISBN: (纸本)0769515215;0769515223

In this paper we present a three-dimensional model retrieval system. In our approach, a three-dimensional model is described by, three invariant descriptors: a curvature index which consists of a histogram of the principal curvatures of each face of the mesh, a histogram of distances between the faces, and a histogram of the volumes based on each face. This work focuses on extracting these invariant descriptors from the three-dimensional models, and on combining these descriptors in order to improve retrieval performance. An experimental evaluation demonstrates the satisfactory performance of our approach on a fifty, three dimensional models database.

关键词： Graphic methods

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description of simple method in 3d reconstruction in medical imaging 1

Description of simple method in 3D reconstruction in medical...

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

作者： Marchessoux, C Richard, N Fernandez, C IRCOM SIC Lab F-86962 Futuroscope France

ISBN: (纸本)0769515215;0769515223

The aim of this study is to present researches made in a 3d scanner conception of hum-an foot. The first step of foot reconstruction is treated. The cloud number points is increased thanks to a combination of several methods. The first method for the first points extraction is explained. The relative length, height and width of the object are obtained in order to construct the parallelepiped including the foot. All parallelepiped points are virtually assigned to foot points. Each image are projected in the volume in the different planes of the views in order to eliminate the exterior points. From the volume of all these points only the points of the surface are retained. The points of the cloud should be located on or out surface foot. This reconstruction must be ameliorated by an active triangulation. We will use the tools of matching points of stereovision in the images profiles.

关键词： Medical imaging

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Exploitation of 3d images for face authentication under pose and illumination variations

Exploitation of 3D images for face authentication under pose...

引用

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

作者： Tsalakanidou, F Malassiotis, S Strintzis, MG Aristotle Univ Thessaloniki Elect & Comp Engn Dept Informat Proc Lab Thessaloniki 54124 Greece

ISBN: (纸本)0769522238

An appearance-based face authentication system integrating 2d color or intensity images and 3d data is presented in this paper The proposed system is based on a low-cost 3d and color sensor capable of synchronous real-time acquisition of 3d images and associated color images. Novel algorithms are proposed that exploit depth information and prior knowledge of face geometry and symmetry to achieve robust face detection, localization and authentication under conditions of background clutter occlusion, face pose alteration and harsh illumination. A method for the enrichment of face databases with synthetically generated views depicting variations in pose and illumination is proposed to cope with head rotations and illumination variations, avoiding a cumbersome enrolment process. The performance of the proposed authentication scheme is tested thoroughly on a face database of 1500 images, recorded with the 3d acquisition system. Experimental results demonstrate significant gains resulting from the combined use of depth and color or intensity information, in comparison to the use of 2d images alone.

关键词： Face recognition

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A surface partitioning spectrum (SPS) for retrieval and indexing of 3d CAd models

A surface partitioning spectrum (SPS) for retrieval and inde...

引用

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

作者： Rea, HJ Corney, JR Clark, dER Taylor, NK Heriot Watt Univ Edinburgh Midlothian Scotland

ISBN: (纸本)0769522238

Manual indexing of large databases of geometric information is costly and often impracticable. Because of this research into retrieval and indexing schemes has focused on the development of various 3d to 2d mappings that characterise a shape as a histogram with a small number of parameters. Many methods of generating such 2d signatures (i.e. histograms) have been proposed, generally based on geometric measures of say curvature or distance. However these geometric signatures lack information about topology and tend to become indistinct as the complexity of the shape increases. This paper describes a new method for characterising both the geometry and topology of shapes in a single 2d graph, the Surface Partitioning Spectrum (SPS). We evaluate the effectiveness of using the SPS with a Neural Network to assess the similarity of shapes within a test set.

关键词： Computer aided design

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Robust 3d segmentation for underwater acoustic images

Robust 3D segmentation for underwater acoustic images

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

作者： Tao, LM Castellani, U Murino, V Tsing Hua Univ Dept Comp Sci Beijing 100084 Peoples R China

ISBN: (纸本)0769522238

In this paper a new technique for 3d acoustic image segmentation and modelling is proposed. Especially, in the underwater environment, in which optical sensors suffer from visibility problems, the acoustical devices may provide efficient solutions, but, on the other hand, acoustic image interpretation is surely more difficult for a human operator The proposed application involves the use of an acoustic camera which directly acquires images structured as a set of 3d points. due to the noisy nature of this type of data, the segmentation problem becomes more challenging and the standard algorithms for range image segmentation are likely to fail. The proposed method is based on a simplified version of the so called recover and select paradigm in which the seed areas, front which the segmentation starts, are generated by adopting a robust approach based on the RANSAC (RANdom Sample And Consensus) algorithm. Superquadric primitives are directly recovered from raw data without any pre-segmentation processing. Experimental trials using both synthetic and real acoustical images confirm the goodness of the method, and a large robustness of the resulting segmented images, associated to a relatively low computational load.

关键词： Image segmentation

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Scalable and efficient coding of 3d model extracted from a video

Scalable and efficient coding of 3D model extracted from a v...

引用

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

作者： Balter, R Gioia, P Morin, L Galpin, F France Telecom R&D F-35512 Cesson Sevigne France

ISBN: (纸本)0769522238

This paper presents an efficient and scalable coding scheme for transmitting a stream of 3d models extracted from a video. As in classical model-based video coding, the geometry, connectivity, and texture of the 3d models have to be transmitted, as well as the camera position for each frame in the original video. The proposed method is based on exploiting the interrelations existing between each type of information, instead of coding them independently, allowing a better prediction of the next 3d model in the stream. Scalability is achieved through the use of wavelet-based representations for both texture and geometry of the models. A consistent connectivity is built for all 3d models extracted from the video sequence, which allows a more compact representation and straightforward geometric morphing between successive models. Furthermore this leads to a consistent wavelet decomposition for 3d models in the stream. Quantitative and qualitative results for the proposed scheme are compared with the state of the art video coder H264, 3d model-based Galpin coder and independent MPEG4-based coding of the information. Targeted applications include distant visualization of the original video at very low bitrate and interactive navigation in the extracted 3d scene on heterogeneous terminals.

关键词： Image coding

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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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Surface normals and height from non-Lambertian image data

Surface normals and height from non-Lambertian image data

引用

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

作者： Ragheb, H Hancock, ER Univ York Dept Comp Sci York YO1 5DD N Yorkshire England

ISBN: (纸本)0769522238

It is well known that many surfaces exhibit reflectance that is not well modelled by Lambert's law. This is the case not only for surfaces that are rough or shiny, but also those that are matte and composed of materials that are particle suspensions. As a result, standard Lambertian shape-from-shading methods can not be applied directly to the analysis of rough and shiny surfaces. In order to overcome this difficulty, in this paper, we consider how to reconstruct the Lambertian component for rough and shiny surfaces when the object is illuminated in the viewing direction. To do this we make use of the diffuse reflectance models described by Oren and Nayar, and by Wolff. Our experiments with synthetic and real-world data reveal the effectiveness of the correction method, leading to improved surface normal and height recovery.

关键词： data processing

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3d Smart City Simulator 3

3D Smart City Simulator

引用

IEEE 3rd international symposium in Robotics and Manufacturing Automation (ROMA)

作者： Adil, Syed Hasan Aziz, Azrina Abd Akber, Talha Ebrahim, Mansoor Ali, Syed Saad Azhar Raza, Kamran Iqra Univ Dept Comp Sci Karachi Pakistan Univ Teknol PETRONAS Ctr Intelligent Signal & Imaging Res Dept Elect & Elect Engn Seri Iskandar Malaysia

ISBN: (纸本)9781538625392

The aim of this research work is to design a smart city simulator. The proposed simulator contains the 3d model of several locations of the city with each location equipped with multiple types of virtual sensors node. The virtual sensors mainly include Noise Sensor, Air Pollution, Ultrasonic Sensor, Humidity Sensor, Temperature Sensor and Video Camera. These sensors continuously monitor and collect the data from the environment and upload it to a public cloud for further analysis through virtual gateway node. The virtual gateway node provides communication of sensors node with virtual cloud hosted server. In addition, the proposed simulator also provides a mapping interface that aids to integrate the physical sensors with the virtual sensors of the 3d model. This will benefit the visualization of physical level environment on the 3d model of the smart city simulator at the same time.

关键词： Simulator Smart City Sensor Network 3d Model Communication Protocols

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