Proceedings. 1999 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (Cat. No PR00149)

23-25 June 1999

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  • Proceedings 1999 IEEE Computer Society Conference on Computer Vision and Pattern Recognition Vol. Two

    Publication Year: 1999, Page(s):i - xviii
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    Freely Available from IEEE
  • Visual tracking and control using Lie algebras

    Publication Year: 1999, Page(s):652 - 657 Vol. 2
    Cited by:  Papers (19)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (578 KB)

    A novel approach to visual servoing is presented, which takes advantage of the structure of the Lie algebra of affine transformations. The aim of this project is to use feedback from a visual sensor to guide a robot arm to a target position. The sensor is placed in the end effector of the robot, the 'camera-in-hand' approach, and thus provides direct feedback of the robot motion relative to the ta... View full abstract»

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  • Author index

    Publication Year: 1999, Page(s):660 - 663
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    Freely Available from IEEE
  • Panoramic EPI generation and analysis of video from a moving platform with vibration

    Publication Year: 1999
    Cited by:  Papers (5)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (948 KB)

    This paper presents a novel approach for generating and analyzing epipolar plane images (EPIs) from video sequences taken from a moving platform subject to vibration so that the 3D model of an arbitrary scene can be constructed. Two problems are solved in our approach: (1) how to generate EPIs from video under a more general motion than a pure translation; (2) how to analyze the huge amount of dat... View full abstract»

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  • Robot localization using uncalibrated camera invariants

    Publication Year: 1999
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    We describe a set of image measurements which are invariant to the camera internals but are location variant. We show that using these measurements it is possible to calculate the self-localization of a robot using known landmarks and uncalibrated cameras. We also show that it is possible to compute, using uncalibrated cameras, the Euclidean structure of 3-D world points using multiple views from ... View full abstract»

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  • Image interpolation by joint view triangulation

    Publication Year: 1999
    Cited by:  Papers (22)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    Creating novel views by interpolating prestored images or view morphing has many applications in visual simulation. We present in this paper a new method of automatically interpolating two images which tackles two most difficult problems of morphing due to the lack of depth informational pixel matching and visibility handling. We first describe a quasi-dense matching algorithm based on region grow... View full abstract»

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  • Harmonic maps and their applications in surface matching

    Publication Year: 1999
    Cited by:  Papers (33)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The surface-matching problem is investigated in this paper using a mathematical tool called harmonic maps. The theory of harmonic maps studies the mapping between different metric manifolds from the energy-minimization point of view. With the application of harmonic maps, a surface representation called harmonic shape images is generated to represent and match 3D freeform surfaces. The basic idea ... View full abstract»

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  • Reconstruction of linearly parameterized models from single images with a camera of unknown focal length

    Publication Year: 1999
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    This paper deals with the problem of recovering the dimensions of an object and its pose from a single image acquired with a camera of unknown focal length. It is assumed that the object in question can be modeled as a polyhedron where the coordinates of the vertices can be expressed as a linear function of a dimension vector, λ. The reconstruction program takes as input a set of correspond... View full abstract»

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  • Combining information using hard constraints

    Publication Year: 1999
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    In this paper we show how the use of hard constraints in solving estimation problems, by allowing multiple sources of information to be taken into account during optimization, increases robustness and improves efficiency over alternative methods such as the statistical combination of separate optimization results. Our argument is based on an empirical evaluation of the technique which uses a model... View full abstract»

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  • Sensor planning for a trinocular active vision system

    Publication Year: 1999
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    We present an algorithm to solve the sensor planning problem for a trinocular, active vision system. This algorithm uses an iterative optimization method to first solve for the translation between the three cameras and then uses this result to solve for parameters such as pan, tilt angles of the cameras and zoom setting View full abstract»

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  • A new Bayesian framework for object recognition

    Publication Year: 1999
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    We introduce an approach to feature-based object recognition, using maximum a posteriori (MAP) estimation under a Markov random field (MRF) model. This approach provides an efficienct solution for a wide class of priors that explicitly model dependencies between individual features of an object. These priors capture phenomena such as the fact that unmatched features due to partial occlusion are ge... View full abstract»

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  • Torque-based recursive filtering approach to the recovery of 3D articulated motion from image sequences

    Publication Year: 1999
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    In this paper we introduce a recursive filtering method to recover the 3D articulated motion from image sequences. In recursive filtering frameworks, the quality of the results heavily depends on the choice of state variables and the determination of the process model; which models a real object whose motion is to be estimated. Our approach employs robotics dynamics into the recursive filtering fr... View full abstract»

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  • Extending superquadrics with exponent functions: modeling and reconstruction

    Publication Year: 1999
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (860 KB)

    Superquadrics are a family of parametric shapes which can model a diverse set of objects. They have received significant attention because of their compact representation and robust methods for recovery of 3D models. However, their assumption of intrinsical symmetry fails in modeling numerous real-world examples such as human, body, animals, and other naturally occurring objects. In this paper, we... View full abstract»

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  • A dependency-based framework of combining multiple experts for the recognition of unconstrained handwritten numerals

    Publication Year: 1999
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Although Behavior-Knowledge Space (BKS) method does not need any assumptions in combining multiple experts, it should build theoretically exponential storage spaces for storing and managing jointly observed K decisions from K experts. That is, combining K experts needs a (K+1)st-order probability distribution. However, it is well known that the distribution becomes unmanageable in storing and esti... View full abstract»

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  • A new multi-level framework for deformable contour optimization

    Publication Year: 1999
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    Application of dynamic programming to the deformable contours has many advantages, such as guaranteed optimality and numerical stability. However, long execution times of these methods almost always force researchers to use dynamic programming in combination with multiresolution methods. Multiresolution methods shorten the execution time by subsampling the original images after an application of a... View full abstract»

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  • Ligature instabilities in the perceptual organization of shape

    Publication Year: 1999
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    Although the classical Blum skeleton has long been considered unstable, many have attempted to alleviate this defect through pruning. Unfortunately, these methods have an arbitrary basis, and, more importantly, they do not prevent internal structural alterations due to slight changes in an object's boundary. The result is a relative lack of development of skeleton representations for indexing obje... View full abstract»

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  • Unifying boundary and region-based information for geodesic active tracking

    Publication Year: 1999
    Cited by:  Papers (37)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (816 KB)

    This paper addresses the problem of tracking several non-rigid objects over a sequence of frames acquired from a static observer using boundary and region-based information under a coupled geodesic active contour framework. Given the current frame, a statistical analysis is performed on the observed difference frame which provides a measurement that distinguishes between the static and mobile regi... View full abstract»

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  • Critical motions in euclidean structure from motion

    Publication Year: 1999
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    We investigate the motions that lead to ambiguous Euclidean scene reconstructions under several common calibration constraints, giving a complete description of such critical motions for: (i) internally calibrated orthographic and perspective cameras; (ii) in two images, for cameras with unknown focal lengths, either different or equal. One aim of the work was to evaluate the potential of modern a... View full abstract»

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  • The customized-queries approach to CBIR using EM

    Publication Year: 1999
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    This paper makes two contributions. The first contribution is an approach called the “customized-queries” approach (CQA) to content-based image retrieval. The second is an algorithm called FSSEM that performs feature selection and clustering simultaneously. The customized queries approach first classifies a query using the features that best differentiate the major classes and then cus... View full abstract»

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  • Independent motion: the importance of history

    Publication Year: 1999
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (644 KB)

    We consider a problem central in aerial visual surveillance applications-detection and tracking of small, independently moving objects in long and noisy video sequences. We directly use spatiotemporal image intensity gradient measurements to compute an exact model of background motion. This allows the creation of accurate mosaics over many frames and the definition of a constraint violation functi... View full abstract»

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  • Material classification for 3D objects in aerial hyperspectral images

    Publication Year: 1999
    Cited by:  Papers (11)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (772 KB)

    Automated material classification from airborne imagery is an important capability for many applications including target recognition and geospatial database construction. Hyperspectral imagery provides a rich source of information for this purpose but utilization is complicated by the variability in a material's observed spectral signature due to the ambient conditions and the scene geometry. In ... View full abstract»

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  • Subset selection for active object recognition

    Publication Year: 1999
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    This paper presents an algorithm for constructing object representations suitable for recognition. The system automatically selects a representative subset of the views of the object while constructing the eigenspace basis. These views are actively located for object identification and pose determination. All processing is performed on-line. The camera is actively positioned during both representa... View full abstract»

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  • Adaptive balloon models

    Publication Year: 1999
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    The original snake models require a close initialization which in many situations are difficult to acquire. The balloon model presented by Cohen et al. to solve this problem suffers from the difficulty of choosing a constant inflating force due to variable internal shrinking forces and non-constant boundary intensity levels. Xu et al., on the other hand, proposed to use a pressure force to exactly... View full abstract»

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  • Adaptive background mixture models for real-time tracking

    Publication Year: 1999
    Cited by:  Papers (2376)  |  Patents (178)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (812 KB)

    A common method for real-time segmentation of moving regions in image sequences involves “background subtraction“, or thresholding the error between an estimate of the image without moving objects and the current image. The numerous approaches to this problem differ in the type of background model used and the procedure used to update the model. This paper discusses modeling each pixel... View full abstract»

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  • Indexing using a spectral encoding of topological structure

    Publication Year: 1999
    Cited by:  Papers (45)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (636 KB)

    In an object recognition system, if the extracted image features are multilevel or multiscale, the indexing structure may take the form of a tree. Such structures are not only common in computer vision, but also appear in linguistics, graphics, computational biology, and a wide range of other domains. In this paper, we develop an indexing mechanism that maps the topological structure of a tree int... View full abstract»

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