12th International Conference on Image Analysis and Processing, 2003.Proceedings.

17-19 Sept. 2003

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Displaying Results 1 - 25 of 113
  • Proceedings 12th International Conference on Image Analysis and Processing

    Publication Year: 2003
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (269 KB)

    The following topics are dealt with: shape recognition; shape analysis; face recognition; 3D and statistical extraction; Hough and voting based methods; segmentation; matching; 3D objects; color, video and compression; graphs; video analysis; stereo and 3D matching; audio and video; biomedicine and text processing. View full abstract»

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  • Multimodal biometric authentication using quality signals in mobile communications

    Publication Year: 2003, Page(s):2 - 11
    Cited by:  Papers (28)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1040 KB) | HTML iconHTML

    The elements of multimodal authentication along with system models are presented. These include the machine experts as well as machine supervisors. In particular, fingerprint and speech based systems serve as illustration of a mobile authentication application. A novel signal adaptive supervisor, based on the input biometric signal quality, is evaluated. Experimental results on data collected from... View full abstract»

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  • Recognising moving hand shapes

    Publication Year: 2003, Page(s):14 - 19
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (461 KB) | HTML iconHTML

    The paper presents a new hand shape representation technique that characterises the finger-only topology of the hand, by adapting an existing technique from speech signal processing. From a moving hand sequence, the tracking algorithm determines the centre of the largest convex subset of the hand, using a combination of pattern matching and condensation algorithms. A hand shape feature represents ... View full abstract»

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  • Real-time hand shape recognition for human interface

    Publication Year: 2003, Page(s):20 - 25
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (442 KB) | HTML iconHTML

    Recently, a natural and user-friendly human interface has been actively researched. Although conventional user interfaces are based on keyboards and mice, human body actions can be used for a human-machine interface. From this point of view, we have researched into vision-based real-time human motion analysis. The important point is that we have employed vision-based methods, because they do not i... View full abstract»

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  • Shape recognition by distributed recursive learning of multiscale trees

    Publication Year: 2003, Page(s):26 - 30
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (399 KB) | HTML iconHTML

    We present an efficient and fully parallel 2D object recognition method based on the use of a multiscale tree representation of the object boundary and recursive learning of trees. Specifically, the object is represented by means of a tree where each node, corresponding to a boundary segment at some level of resolution, is characterized by a real vector containing curvature, length, and symmetry o... View full abstract»

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  • Improving shape recovery by estimating properties of slightly-rough surfaces

    Publication Year: 2003, Page(s):32 - 37
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (697 KB) | HTML iconHTML

    We illustrate the use of the Beckmann formulation of the Kirchhoff theory for surface analysis problems in computer vision. The Beckmann model is a physical model that describes the reflectance of light from rough surfaces. Here, we use the modified form of the Beckmann model for slightly-rough surfaces using the modification of C.L. Vernold and J.E. Harvey (see Proc. SPIE, vol.3426, p.51-6, 1998)... View full abstract»

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  • A spectral analysis of perceptual shape variation

    Publication Year: 2003, Page(s):38 - 43
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (547 KB) | HTML iconHTML

    Many methods of statistical shape description operate by describing shapes in terms of the variations inherent in a training set. This represents a limitation in that a training set must be assembled beforehand, and that only shapes lying within the span of the training data can be succinctly described. We develop a statistical representation that describes a shape in terms of the variations inher... View full abstract»

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  • Classification based on iterative object symmetry transform

    Publication Year: 2003, Page(s):44 - 49
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (526 KB) | HTML iconHTML

    The paper shows an application of a new operator named the iterated object transform (IOT) for cell classification. The IOT has the ability to grasp the internal structure of a digital object and this feature can be usefully applied to discriminate structured images. This is the case of cells representing chondrocytes in bone tissue, giarda protozoan, and myeloid leukaemia. A tree classifier allow... View full abstract»

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  • Using hidden Markov models and wavelets for face recognition

    Publication Year: 2003, Page(s):52 - 56
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (401 KB) | HTML iconHTML

    In this paper, a new system for face recognition is proposed, based on hidden Markov models (HMM) and wavelet coding. A sequence of overlapping sub-images is extracted from each face image, computing the wavelet coefficients for each of them. The whole sequence is then modelled by using hidden Markov models. The proposed method is compared with a DCT coefficient-based approach (Kohir et al. (1998)... View full abstract»

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  • View-invariant face detection method based on local PCA cells

    Publication Year: 2003, Page(s):57 - 62
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB) | HTML iconHTML

    The paper presents a view-invariant face detection method based on local PCA cells. In order to extract the general features of faces at each view and position, Gabor filters and local PCA are used. Local PCA cells specialized to each view and position are made by applying a Gaussian to the outputs of the local PCA of Gabor features. By applying the Gaussian, only the local PCA cells which are a s... View full abstract»

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  • PCA vs low resolution images in face verification

    Publication Year: 2003, Page(s):63 - 67
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (243 KB) | HTML iconHTML

    Principal components analysis (PCA) has been one of the most applied methods for face verification using only 2D information, in fact, PCA is practically the method of choice for face verification applications in the real-world. An alternative method to reduce the problem dimension is working with low resolution images. In our experiments, three classifiers have been considered to compare the resu... View full abstract»

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  • A feature-based face recognition system

    Publication Year: 2003, Page(s):68 - 73
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB) | HTML iconHTML

    A completely automatic face recognition system is presented. The method works on color and gray level images: after having localized the face and the facial features, it determines 16 facial fiducial points, and characterizes them by applying a bank of filters which extract the peculiar texture around them (jets). Recognition is realized by measuring the similarity between the different jets. The ... View full abstract»

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  • Virtual gaze redirection in face images

    Publication Year: 2003, Page(s):76 - 81
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (306 KB) | HTML iconHTML

    In video-conferencing, the participant watches the screen rather than the camera. This turns the gaze direction away from the other party and makes eye contact impossible. Artificial gaze redirection by iris repositioning has been proposed, but the feasibility of crucial algorithmic components, especially the challenging computer vision parts, was not demonstrated. This paper demonstrates a system... View full abstract»

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  • A topological approach for segmenting human body shape

    Publication Year: 2003, Page(s):82 - 87
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (467 KB) | HTML iconHTML

    Segmentation of a 3D human body, is a very challenging problem in applications exploiting human scan data. To tackle this problem, the paper proposes a topological approach based on the discrete Reeb graph (DRG) which is an extension of the classical Reeb graph to handle unorganized clouds of 3D points. The essence of the approach concerns detecting critical nodes in the DRG, thereby permitting th... View full abstract»

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  • Object recognition via recognition of finger pointing actions

    Publication Year: 2003, Page(s):88 - 93
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (474 KB) | HTML iconHTML

    We propose an object recognition method in which the identity of objects is determined by observing the finger pointing action of persons. The system determines the head and hands regions, tracks them in real time, and verifies them through an analysis of 3D data points. Then it determines the pointing direction and intersects it with an environment model. Intersection computations are based on po... View full abstract»

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  • Head modeling using color unequal phase stepping method

    Publication Year: 2003, Page(s):94 - 98
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (534 KB) | HTML iconHTML

    3D shape modeling using color light projection is a new and promising technique. It is suitable for fast 3D modeling of moving objects, like human heads. In this paper, we demonstrated a new method for 3D head modeling by incorporating a priori knowledge of human face and unequal phase, stepping to alleviate the color coupling errors raised in the color projection scheme. Unlike prior art, the pro... View full abstract»

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  • An agent-based approach for tracking people in indoor complex environments

    Publication Year: 2003, Page(s):99 - 102
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (433 KB) | HTML iconHTML

    This paper presents an agent-based architecture designed to functionally combine data from an homogeneous network of sensors for tracking purposes. The system has been developed in a video surveillance context to detect, classify and track moving objects in a scene of interest. Although single camera systems could perform the tasks outlined above, they would not be able to deal with topologically ... View full abstract»

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  • A machine learning approach for human posture detection in domotics applications

    Publication Year: 2003, Page(s):103 - 108
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB) | HTML iconHTML

    This paper describes an approach for human posture classification that has been devised for indoor surveillance in domotic applications. The approach was initially inspired to a previous work of Haritaoglou et al. (1998) that uses histogram projections to classify people's posture. We modify and improve the generality of the approach by adding a machine learning phase in order to generate probabil... View full abstract»

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  • Real-time tracking of multiple persons

    Publication Year: 2003, Page(s):109 - 114
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB) | HTML iconHTML

    Robust tracking of persons in real-world environments and in real-time is a common goal in many video applications. In this paper a computational system for the real-time tracking of multiple persons in natural environments is presented. The system integrates state-of-the-art methodologies for the analysis of movement and color, as well as for the detection of faces. Face detection is complemented... View full abstract»

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  • Face detection for visual surveillance

    Publication Year: 2003, Page(s):115 - 120
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (453 KB) | HTML iconHTML

    In this paper, a real-time face detection system for color image sequences is presented. The system applies three different face detection methods and integrates the obtained results to achieve a greater location accuracy. The first method localizes the human head through outline analysis, focusing the attention of the system on a small image area. The second, a skin color method, is applied to th... View full abstract»

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  • Face recognition committee machines: dynamic vs. static structures

    Publication Year: 2003, Page(s):121 - 126
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3420 KB) | HTML iconHTML

    We propose a dynamic face recognition committee machine (DFRCM) consisting of five well-known state-of-the-art algorithms in this paper. In previous work, we have developed a static committee machine which outperforms all the individual algorithms in the experiments. However, the weight for each expert in the committee is fixed and cannot be changed once the system is trained. We propose a dynamic... View full abstract»

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  • Real-time human figure control using tracked blobs

    Publication Year: 2003, Page(s):127 - 132
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (322 KB) | HTML iconHTML

    This paper describes a vision based human figure motion control. Our purpose is to do seamless mapping of human motion in the real world into virtual environments. With the aim of making computing systems suited for users, we have developed a vision based human motion analysis and synthesis method. The human motion analysis method is implemented by blob tracking, and the motion synthesis method is... View full abstract»

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  • Human detection and tracking within hostile aquatic environments

    Publication Year: 2003, Page(s):133 - 138
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (567 KB) | HTML iconHTML

    Many deployed systems for human motion tracking and detection are found inadequate when applied on hostile outdoor environments. This paper provides insights into this problem by developing an outdoor aquatic surveillance system, which detects swimmers within the hostile environment of an outdoor public swimming pool. A novel block-based background model and thresholding-with-hysteresis methodolog... View full abstract»

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  • Olympus: an ambient intelligence architecture on the verge of reality

    Publication Year: 2003, Page(s):139 - 144
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB) | HTML iconHTML

    This paper presents Olympus, a modular processing architecture for a distributed ambient intelligence. The system is aimed at detailed reporting of people wandering and gesturing in complex indoor environments. The design of the architecture has been driven by two main principles: reliable algorithm testing and system scalability. The first goal has been achieved through the development of Zeus, a... View full abstract»

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  • View synthesis from uncalibrated images using parallax

    Publication Year: 2003, Page(s):146 - 151
    Cited by:  Papers (8)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (483 KB) | HTML iconHTML

    This work deals with the view synthesis problem, i.e., how to generate snapshots of a scene taken from a "virtual" viewpoint different from all the viewpoints of the real views. Starting from uncalibrated reference images, the geometry of the scene is recovered by means of the relative affine structure. This information is used to extrapolate novel views using planar warping plus parallax correcti... View full abstract»

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