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Proceedings of 1994 IEEE 2nd CAD-Based Vision Workshop

8-11 Feb. 1994

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Displaying Results 1 - 25 of 34
  • Feature based aspects-trees. Generation and interpretation

    Publication Year: 1994, Page(s):192 - 201
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    Presents a new approach in the field of CAD-based vision starting up from the retrieval of the data from a CAD system. A viewer-centered approach is used to generate a set of normalized views. They serve as a basis for an optimal selection of features. The aspect idea is used for grouping the values of the features into aspect-trees. The sophisticated interpretation of the trees proves the ability... View full abstract»

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  • Reconstructing CAD models of articulated objects

    Publication Year: 1994, Page(s):98 - 105
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (882 KB)

    We present an algorithm for recovering a CAD model from a time sequence of range images of an articulated object. Each recovered part is described using an augmented boundary representation which includes the actually observed surfaces of the object part, implied surfaces between it and other connected parts, and occlusion limits to the unseen portion of the part. The algorithm first develops feat... View full abstract»

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  • Creating random structural descriptions of CAD models and determining object classes

    Publication Year: 1994, Page(s):38 - 45
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Addresses two problems related to organizing CAD models represented as random parametric structural descriptions (RPSDs). First, the authors present a method to estimate the probability information for RPSDs from CAD models. The randomness arising from viewpoint variation is captured in the random variables corresponding to the attributes of the primitives and the relationship tuples. Next, and mo... View full abstract»

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  • Sensor modeling, probabilistic hypothesis generation, and robust localization for object recognition

    Publication Year: 1994, Page(s):46 - 53
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    In an effort to make object recognition efficient and accurate enough for applications, the authors have developed three techniques; sensor modeling, probabilistic hypothesis generation, and robust localization-which form the basis of a probabilistic object recognition algorithm. To minimize recognition time, these techniques exploit prior knowledge to reduce the number of verifications (the most ... View full abstract»

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  • Optimal geometric model matching under full 3D perspective

    Publication Year: 1994, Page(s):54 - 63
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    Matching algorithms use random-start local search and a 3D pose recovery algorithm to find optimal matches between 3D object models and 2D image features. An algorithm using only a a weak-perspective approximation to full 3D perspective solves a subset of the test problems presented. A second algorithm always uses an iterative 3D pose algorithm to account for 3D perspective and solves all test pro... View full abstract»

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  • Unified 3D models for multisensor image synthesis

    Publication Year: 1994, Page(s):161 - 168
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    A unified approach to modelling three dimensional objects for multisensory imagery and feature prediction is presented. The object representation is a modified volume-surface octree. This representation is well adapted for the simulations of the physical processes that affect the generation of the different imagery. Specifically, the model supports visual, thermal and laser radar imagery. It is sh... View full abstract»

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  • A visual database system for data and experiment management in model-based computer vision

    Publication Year: 1994, Page(s):64 - 72
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (732 KB)

    We present the design of a visual database system for data and experiment management. Our system was designed as a general scientific database system, but motivated by and intended for use in model-based computer vision. We provide a unified data model, a highly graphical user interface, an advanced query facility, and an interactive laboratory notebook. We hope that the system, when completed, wi... View full abstract»

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  • IVIS: an integrated volumetric inspection system

    Publication Year: 1994, Page(s):220 - 227
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    Presents a novel approach to automated visual inspection based on comparing volumetric models of a reference object to a model of an actual object iteratively created from sensor data. The use of volumetric models gives this approach a number of distinct advantages over more traditional surface-based methods. First, there is no need to identify “features” which is important when inspec... View full abstract»

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  • Interactive learning of multiple attribute hash table for fast 3D object recognition

    Publication Year: 1994, Page(s):17 - 27
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    Multiple-attribute hashing is now considered to be a powerful approach for the recognition and localization of 3D objects on the basis of their invariant properties. In the systems developed to date, the hash tables must be created by the system developer-an onerous task especially when the number of attributes is large, which is the case in systems that use both geometric and nongeometric attribu... View full abstract»

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  • Automating the sensor placement task for accurate dimensional inspection

    Publication Year: 1994, Page(s):142 - 150
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    Deriving accurate 3D object dimensions with a vision system for inspection tasks demands the use of multi-station sensor configurations. In such configurations, each feature appears in images from multiple viewpoints facilitating its measurement by means of optical triangulation. This paper reviews photogrammetric expertise in the design of such configurations, including the bundle method, a gener... View full abstract»

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  • Generic object recognition using CAD-based multiple representations

    Publication Year: 1994, Page(s):202 - 209
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    Real-world applications of computer vision usually involve a variety of object models making a single model representation somewhat inadequate for object recognition. Multiple representations, on the other hand, allow different matching strategies to be applied for the same object, or even for different parts of the same object. The paper is concerned with the use of CAD-derived hierarchical model... View full abstract»

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  • Probabilistic indexing: a new method of indexing 3D model data from 2D image data

    Publication Year: 1994, Page(s):2 - 8
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    Recent research has indicated that indexing is a promising approach to fast model-based object recognition because it allows most of the possible matches between image point groups and model point groups to be quickly eliminated from consideration. Current indexing systems for the problem of recognizing general 3-D objects from single 2-D images require groups of four points to generate a key into... View full abstract»

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  • Merging multiple views using a spherical representation

    Publication Year: 1994, Page(s):124 - 131
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    This paper proposes a new method for building a 3-D model from a set of range images. The method can merge data of free-form surfaces obtained from arbitrary viewing directions, with no prior knowledge of the poses. Our approach is based on matching the spherical representations of an object between the views. To obtain the spherical representation, we deform a discrete mesh to fit the object surf... View full abstract»

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  • A robust method for registration and segmentation of multiple range images

    Publication Year: 1994, Page(s):106 - 113
    Cited by:  Papers (7)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    Registration and segmentation of multiple range images are one of the most important problems in range image analysis. This problem has been investigated by a number of researchers, but most of existing methods are easily affected by outlying points (outliers) like noise and occlusion. We first propose a robust method of estimating rigid motion parameters from a pair of range images. This method i... View full abstract»

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  • Building global object models by purposive viewpoint control

    Publication Year: 1994, Page(s):169 - 182
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1124 KB)

    Presents an approach for recovering a global surface model of an object from the deformation of the occluding contour using an active (i.e., mobile) observer able to control its motion. In particular, the authors consider two problems: (1) How can the observer's viewpoint be controlled in order to generate a dense sequence of images that allows incremental reconstruction of an unknown surface, and... View full abstract»

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  • Building a B-rep from a segmented range image

    Publication Year: 1994, Page(s):74 - 81
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    A segmented range image contains a set of regions representing the projections of the surfaces imaged. Many methods have been proposed to perform the segmentation and surface fitting processes; that is not what this paper is about. Instead, we consider a problem very little analysis has been given to: finding boundary relationships among the regions/surfaces. Since a segmented range image gives us... View full abstract»

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  • Industrial inspection and reverse engineering

    Publication Year: 1994, Page(s):228 - 235
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    Proposes a new design for inspection and reverse engineering environments. The authors have designed and experimented with such an environment for capturing sense data of mechanical parts in an intelligent way. They construct a sensing → CAD interface for the automatic reconstruction of parts from visual data. They briefly discuss the use of the dynamic recursive finite state machine (DRFSM) ... View full abstract»

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  • Surface approximation of a cloud of 3D points

    Publication Year: 1994, Page(s):274 - 281
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    Presents an implementation of deformable models to approximate a 3-D surface given by a cloud of 3-D points. It is an extension of the authors previous work on “B-snakes” (1990), (1992) which approximates curves and surfaces using B-splines. The user (or the system itself) provides an initial simple surface, such as a closed cylinder, which is subject to internal forces (describing imp... View full abstract»

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  • Rapid object recognition from a large model database

    Publication Year: 1994, Page(s):28 - 35
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    A design for a system to perform object recognition from a large model data base is presented, focusing on efficient indexing. The authors propose a decision-theoretic approach using a Bayesian framework to achieve efficient indexing of model objects. A decision-theoretic measure of the discriminatory power of a feature for a model object is defined in terms of posterior probability. Domain-specif... View full abstract»

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  • Planning focus of attention for multi-fingered hand with consideration of time-varying aspects

    Publication Year: 1994, Page(s):151 - 160
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    Visual monitoring of an object manipulated by a multi-fingered hand has a problem of occlusions caused by the fingers. We propose a new planning method, based on a 3-dimensional CAD model of the environment, to focus attention in such a monitoring task. We formulate the planning to focus attention as a scheduling problem for the whole task period rather than for a specific time. We introduce a gen... View full abstract»

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  • Matching curved 3D object models to 2D images

    Publication Year: 1994, Page(s):210 - 218
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    Presents a method of locating known rigid 3D objects with arbitrary curved surfaces using a single image. A 3D object is modeled by a covering set of 2D silhouettes together with important internal edges. The model silhouette is derived by the curvature method of Basri and Ullman. Internal edges are computed using a stereo matching strategy. The pose of the observed object is determined by fitting... View full abstract»

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  • Geometric hashing with attributed features

    Publication Year: 1994, Page(s):9 - 16
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    Geometric hashing systems for object recognition have typically made use of point features in order to describe models and objects. When lines have been included as primitive features, they have been used to generate collections of points from pairwise intersections. In the experiments described in the paper, the authors use line features that include location and orientation information. These fe... View full abstract»

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  • Multiple representation approach to geometric model construction from range data

    Publication Year: 1994, Page(s):132 - 139
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    This paper concentrates on techniques for constructing geometric models from data provided by 3-D imaging sensors. Such techniques allow for rapid modeling of sculptured free-form shapes and generation of geometric models for existing parts. Also, the problem of merging images in order to obtain a complete 3-D data set is addressed. The shape representations are closely related to modeling primiti... View full abstract»

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  • Building three-dimensional CAD/CAM models from image sequences

    Publication Year: 1994, Page(s):116 - 123
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    We present the results from a working system designed to reconstruct a complete CAD/CAM surface model for objects that have both smooth and sharp surface boundaries. The input is a sequence of images of the object; the output is a 3D surface mesh that can be manipulated and rendered with standard CAD/CAM tools. It is now well-known that complete surface information (second order differential surfa... View full abstract»

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  • Fitting a surface to 3-D points using an inflating balloon model

    Publication Year: 1994, Page(s):266 - 273
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (716 KB)

    We address the problem of fitting a surface to a cloud of 3-D points, as obtained from a set of registered range images. Our approach is based on a dynamic balloon model represented using a triangulated mesh. The vertices in the mesh are linked to their neighboring vertices through springs to simulate the surface tension and to keep the shell smooth. Unlike other dynamic models proposed by previou... View full abstract»

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