References of "Van Droogenbroeck, Marc"
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See detailFrontal-view gait recognition by intra- and inter-frame rectangle size distribution
Barnich, Olivier ULg; Van Droogenbroeck, Marc ULg

in Pattern Recognition Letters (2009), 30

Current trends seem to accredit gait as a sensible biometric feature for human identification, at least in a multimodal system. In addition to being a robust feature, gait is hard to fake and requires no ... [more ▼]

Current trends seem to accredit gait as a sensible biometric feature for human identification, at least in a multimodal system. In addition to being a robust feature, gait is hard to fake and requires no cooperation from the user. As in many video systems, the recognition confidence relies on the angle of view of the camera and on the illumination conditions, inducing a sensitivity to operational conditions that one may wish to lower. In this paper we present an efficient approach capable of recognizing people in frontal-view video sequences. The approach uses an intra-frame description of silhouettes which consists of a set of rectangles that will fit into any closed silhouette. A dynamic, inter-frame, dimension is then added by aggregating the size distributions of these rectangles over multiple successive frames. For each new frame, the inter-frame gait signature is updated and used to estimate the identity of the person detected in the scene. Finally, in order to smooth the decision on the identity, a majority vote is applied to previous results. In the final part of this article, we provide experimental results and discuss the accuracy of the classification for our own database of 21 known persons, and for a public database of 25 persons. [less ▲]

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See detailAnalyse et conception des systèmes de télécommunications
Van Droogenbroeck, Marc ULg

Learning material (2008)

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See detailPrincipes des télécommunications analogiques et numériques
Van Droogenbroeck, Marc ULg

Learning material (2008)

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See detailPrincipes des télécommunications analogiques et numériques
Van Droogenbroeck, Marc ULg

Learning material (2008)

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See detailTraitement numérique des images
Van Droogenbroeck, Marc ULg

Learning material (2007)

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See detailTraitement numérique des images (transparents)
Van Droogenbroeck, Marc ULg

Learning material (2007)

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See detailPrincipes de base du réseau GSM et des transmissions GPRS
Van Droogenbroeck, Marc ULg

Conference given outside the academic context (2006)

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See detailA video-based human-computer interaction system for audio-visual immersion
Dardenne, Renaud; Embrechts, Jean-Jacques ULg; Van Droogenbroeck, Marc ULg et al

in Proceedings of SPS-DARTS (2006, March)

This paper describes the video and audio tools that have been implemented in a real-type system to immerse a user into a virtual scene. The video tools include motion detection, skin detection by ... [more ▼]

This paper describes the video and audio tools that have been implemented in a real-type system to immerse a user into a virtual scene. The video tools include motion detection, skin detection by thresholding, shadow detection and extraction, and finally the user’s head and hands detection. Once this is done, the user (who is surrounded by a matrix of loudspeakers) is able to move a sound source in the horizontal plane around him. Moreover, the sound is auralized by convolution with (directional) room impulse responses, which have been pre-computed by a ray tracing method. The different sound contributions are distributed to the individual loudspeakers by applying the VBAP technique. [less ▲]

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See detailRobust analysis of silhouettes by morphological size distributions
Barnich, Olivier ULg; JODOGNE, Sébastien ULg; Van Droogenbroeck, Marc ULg

in Lecture Notes in Computer Science (2006), 4179

We address the topic of real-time analysis and recognition of silhouettes. The method that we propose first produces object features obtained by a new type of morphological operators, which can be seen as ... [more ▼]

We address the topic of real-time analysis and recognition of silhouettes. The method that we propose first produces object features obtained by a new type of morphological operators, which can be seen as an extension of existing granulometric filters, and then insert them into a tailored classification scheme. Intuitively, given a binary segmented image, our operator produces the set of all the largest rectangles that can be wedged inside any connected component of the image. The latter are obtained by a standard background subtraction technique and morphological filtering. To classify connected components into one of the known object categories, the rectangles of a connected component are submitted to a machine learning algorithm called EXtremely RAndomized trees (Extra-trees). The machine learning algorithm is fed with a static database of silhouettes that contains both positive and negative instances. The whole process, including image processing and rectangle classification, is carried out in real-time. Finally we evaluate our approach on one of today's hot topics: the detection of human silhouettes. We discuss experimental results and show that our method is stable and computationally effective. Therefore, we assess that algorithms like ours introduce new ways for the detection of humans in video sequences. [less ▲]

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See detailResearch Unit in Signal and Image Exploitation (INTELSIG)
Verly, Jacques ULg; Piater, Justus ULg; Van Droogenbroeck, Marc ULg et al

Scientific conference (2006)

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See detaillibmorpho: a library for mathematical morphology
Dardenne, Renaud; Van Droogenbroeck, Marc ULg

Software (2006)

libmorpho is a free software library written in ANSI C that implements several basic operations of mathematical morphology: erosions, dilations, openings, and closings by lines, rectangles, or arbitrary ... [more ▼]

libmorpho is a free software library written in ANSI C that implements several basic operations of mathematical morphology: erosions, dilations, openings, and closings by lines, rectangles, or arbitrary shaped structuring elements or by structuring functions. The software is released under the GNU General Public license. [less ▲]

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See detailA method based on multiple adaptive windows to improve the determination of disparity maps
Demoulin, Cédric; Van Droogenbroeck, Marc ULg

in ProRISC/IEEE Workshop on Circuit, Systems and Signal Processing (2005, November)

The correspondence problem is one of main topics in stereo vision that, despites being studied for many years, is still in progress. In this paper, we present a new method that computes the disparity map ... [more ▼]

The correspondence problem is one of main topics in stereo vision that, despites being studied for many years, is still in progress. In this paper, we present a new method that computes the disparity map. Our method is local (i.e. only information gathered in the close neighborhood is used) and is based on image statistics. More specifically it combines multiple adaptive windows and local statistical measures in order to optimize the quality of the computation of disparity maps. As the size of windows is critical for local methods, we propose an algorithm that modifies the size of windows surrounding the pixel of interest to capture enough information in regions with low texture energy. This process is based on statistical measures (mean and horizontal/vertical average deviation) taken in the windows of the original stereo images. In the last section we show that our method performs very well compared to other existing local methods. [less ▲]

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See detailThe CINEMA Project: A Video-Based Human-Computer Interaction System for Audio-Visual Immersion
Dardenne, Renaud; Embrechts, Jean-Jacques ULg; Van Droogenbroeck, Marc ULg et al

in ERCIM News (2005), 62

Numerous studies are currently focusing on the modelling of humans and their behavior in 3D environments. The CINEMA project has similar goals but differentiates itself by aiming at enhanced interactions ... [more ▼]

Numerous studies are currently focusing on the modelling of humans and their behavior in 3D environments. The CINEMA project has similar goals but differentiates itself by aiming at enhanced interactions, the creation of mixed reality, and the creation of interactive and reactive acoustical environments. Part of the project consists in gesture recognition of a user, who is given the real-time control of auralization and audio spatialization processes. [less ▲]

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See detailMorphological erosions and openings: fast algorithms based on anchors
Van Droogenbroeck, Marc ULg; Buckley, Michael

in Journal of Mathematical Imaging and Vision (2005), 22(2-3), 121-142

Several efficient algorithms for computing erosions and openings have been proposed recently. They improve on VAN HERK's algorithm in terms of number of comparisons for large structuring elements. In this ... [more ▼]

Several efficient algorithms for computing erosions and openings have been proposed recently. They improve on VAN HERK's algorithm in terms of number of comparisons for large structuring elements. In this paper we introduce a theoretical framework of anchors that aims at a better understanding of the process involved in the computation of erosions and openings. It is shown that the knowledge of opening anchors of a signal f is sufficient to perform both the erosion and the opening of f. Then we propose an algorithm for one-dimensional erosions and openings which exploits opening anchors. This algorithm improves on the fastest algorithms available in literature by approximately 30% in terms of computation speed, for a range of structuring element sizes and image contents [less ▲]

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See detailAcquisition vidéo au moyen d'une caméra IEEE 1394
Dardenne, Renaud; Van Droogenbroeck, Marc ULg

in Linux Magazine (2005), 69

Pour l'acquisition vidéo grand public, la norme USB 1.1 est devenu le choix le plus courant en matière de standard d'interconnexion. Pour des applications à plus haut débit, les utilisateurs préfèrent ... [more ▼]

Pour l'acquisition vidéo grand public, la norme USB 1.1 est devenu le choix le plus courant en matière de standard d'interconnexion. Pour des applications à plus haut débit, les utilisateurs préfèrent recourir à des cartes d'acquisition vidéo dédiées ou à des normes d'interfaçage génériques, permettant des transferts à débit plus élevé. Cet article explique comment se servir de la norme IEEE 1394, aussi appelée FireWire ou i.Link, pour l'acquisition de séquences vidéo. [less ▲]

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See detailDesign of statistical measures for the assessment of image segmentation schemes
Van Droogenbroeck, Marc ULg; Barnich, Olivier ULg

in International Conference on Computer Analysis of Images and Patterns (CAIP 2005) (2005)

Image segmentation is discussed for years in numerous papers, but assessing its quality is mainly dealt with in recent works. Quality assessment is a primary concern for anyone working towards better ... [more ▼]

Image segmentation is discussed for years in numerous papers, but assessing its quality is mainly dealt with in recent works. Quality assessment is a primary concern for anyone working towards better segmentation tools. It both helps to objectively improve segmentation techniques and to compare performances with respect to other similar algorithms. In this paper we use a statistical framework to propose statistical measures capable to describe the performances of a segmentation scheme. All the measures rely on a ground-truth segmentation map that is supposed to be known and that serves as a reference when qualifying the results of any segmentation tool. We derive the analytical expression of several transition probabilities and show how to calculate them. An important conclusion from our study, often overlooked, is that performances can be content dependent, which means that one should adapt a measure to the content of an image. [less ▲]

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