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Marc Van Droogenbroeck - Publications ORBI
Latour, P., & Van Droogenbroeck, M. (2017, October 09). The LNQ25 and ELN PVT Metrics Exhibit a Good Sensitivity to Sleep Deprivation and are Independent from the Subject. Poster session presented at World Sleep Congress 2017, Prague, Czech Republic.
Peer reviewed
Introduction Performance of people undergoing critical tasks (like driving) may be impaired completely by the lowering of their vigilance level, due to sleep deprivation for instance. This reduction of ...
Azrour, S., Pierard, S., Geurts, P., & Van Droogenbroeck, M. (2017). A two-step methodology for human pose estimation increasing the accuracy and reducing the amount of learning samples dramatically. Advanced Concepts for Intelligent Vision Systems.
Peer reviewed
In this paper, we present a two-step methodology to improve existing human pose estimation methods from a single depth image. Instead of learning the direct mapping from the depth image to the 3D pose, we ...
Braham, M., Pierard, S., & Van Droogenbroeck, M. (2017). Semantic Background Subtraction. IEEE International Conference on Image Processing (ICIP), Beijing 17-20 September 2017 (pp. 4552-4556). IEEE.
Peer reviewed
We introduce the notion of semantic background subtraction, a novel framework for motion detection in video sequences. The key innovation consists to leverage object-level semantics to address the variety of ...
Laugraud, B., & Van Droogenbroeck, M. (2017). Is a Memoryless Motion Detection Truly Relevant for Background Generation with LaBGen? Advanced Concepts for Intelligent Vision Systems.
Peer reviewed
The stationary background generation problem consists in generating a unique image representing the stationary background of a given video sequence. The LaBGen background generation method combines a pixel ...
Gómez González, C., Wertz, O., Absil, O., Christiaens, V., Defrere, D., Mawet, D., Milli, J., Absil, P.-A., Van Droogenbroeck, M., Cantalloube, F., Hinz, P., Skemer, A., Karlson, M., & Surdej, J. (2017). VIP: Vortex Image Processing package for high-contrast direct imaging. Astronomical Journal (The).
Peer reviewed (verified by ORBi)
We present the Vortex Image Processing (VIP) library, a python package dedicated to astronomical high-contrast imaging. Our package relies on the extensive python stack of scientific libraries and aims to ...
Laugraud, B., Pierard, S., & Van Droogenbroeck, M. (2017). LaBGen: A method based on motion detection for generating the background of a scene. Pattern Recognition Letters, 96, 12-21.
Peer reviewed (verified by ORBi)
Given a video sequence acquired with a fixed camera, the generation of the stationary background of the scene is a challenging problem which aims at computing a reference image for a motionless background. For ...
Lejeune, A., Verly, J., & Van Droogenbroeck, M. (2017). Probabilistic Framework for the Characterization of Surfaces and Edges in Range Images, with Application to Edge Detection. IEEE Transactions on Pattern Analysis & Machine Intelligence.
Peer reviewed (verified by ORBi)
We develop a powerful probabilistic framework for the local characterization of surfaces and edges in range images, which is useful in many applications of computer vision, such as filtering, edge detection ...
Laugraud, B., Pierard, S., & Van Droogenbroeck, M. (2016). LaBGen-P: A Pixel-Level Stationary Background Generation Method Based on LaBGen. 2016 International Conference on Pattern Recognition Contest Proceedings (pp. 107-113). IEEE.
Peer reviewed
Estimating the stationary background of a video sequence is useful in many applications like surveillance, segmentation, compression, inpainting, privacy protection, and computational photography. To perform ...
Pierard, S., & Van Droogenbroeck, M. (2016). What are the optimal walking tests to assess disability progression? Multiple Sclerosis Journal, 22(S3), 452-453.
Peer reviewed (verified by ORBi)
Background. Therapy success is assumed when there is no evidence of disease activity. Clues to show it include an MRI, the relapses history, questionnaires, and clinical measures to assess the disability ...
Osmalsky, J., Van Droogenbroeck, M., & Embrechts, J.-J. (2016). Enhancing Cover Song Identification with Hierarchical Rank Aggregation. Proceedings of the 17th International for Music Information Retrieval Conference (pp. 136-142).
Peer reviewed
Abstract Cover song identification involves calculating pairwise similarities between a query audio track and a database of reference tracks. While most authors make exclusively use of chroma features, recent ...
Azrour, S., Pierard, S., & Van Droogenbroeck, M. (2016). Leveraging orientation knowledge to enhance human pose estimation methods. Articulated Motion and Deformable Objects AMDO 2016 (pp. 81-87). Springer.
Peer reviewed
Predicting accurately and in real-time 3D body joint positions from a depth image is the cornerstone for many safety, biomedical, and entertainment applications. Despite the high quality of the depth images ...
Pierard, S., Lejeune, A., & Van Droogenbroeck, M. (2016). Boosting shape classifiers accuracy by considering the inverse shape. Journal of Pattern Recognition Research, 11(1), 41-54.
Peer reviewed (verified by ORBi)
Many techniques exist for describing shapes. These techniques almost exclusively consider the contour or the inside of the shape; the major problem for describing the outside of a shape, or inverse shape ...
Azrour, S., Pierard, S., & Van Droogenbroeck, M. (2016, May 19). Improving pose estimation by building dedicated datasets and using orientation. Poster session presented at Human Motion Analysis for Healthcare Applications, London, UK.
Markerless pose estimation systems are useful for various applications including human- computer interaction, activity recognition, security, gait analysis, and computer-assisted medical interventions. They ...
Braham, M., & Van Droogenbroeck, M. (2016). Deep Background Subtraction with Scene-Specific Convolutional Neural Networks. IEEE International Conference on Systems, Signals and Image Processing (IWSSIP), Bratislava 23-25 May 2016 (pp. 1-4). IEEE.
Peer reviewed
Background subtraction is usually based on low-level or hand-crafted features such as raw color components, gradients, or local binary patterns. As an improvement, we present a background subtraction algorithm ...
Gómez González, C., Absil, O., Absil, P.-A., Van Droogenbroeck, M., Mawet, D., & Surdej, J. (2016). Low-rank plus sparse decomposition for exoplanet detection in direct-imaging ADI sequences. The LLSG algorithm. Astronomy and Astrophysics, 589.
Peer reviewed (verified by ORBi)
Context. Data processing constitutes a critical component of high-contrast exoplanet imaging. Its role is almost as important as the choice of a coronagraph or a wavefront control system, and it is intertwined ...
Azrour, S., Pierard, S., & Van Droogenbroeck, M. (2015). Defining a score based on gait analysis for the longitudinal follow-up of MS patients. Multiple Sclerosis Journal, 23(S11), 408-409.
Peer reviewed (verified by ORBi)
BACKGROUND. The project GAIMS [ECTRIMS 2013 P800] aims at developing a gait measuring system particularily suited for the clinical routine, and providing a reference database with the gait characteristics of ...
Pierard, S., Phan-Ba, R., & Van Droogenbroeck, M. (2015). Understanding how people with MS get tired while walking. Multiple Sclerosis Journal, 23(S11), 406.
Peer reviewed (verified by ORBi)
BACKGROUND. Walking impairment is frequent, appears early in the disease course of MS patients (MSP), and is perceived as the most disabling symptom. When walking, patients get tired more and differently than ...
Braham, M., & Van Droogenbroeck, M. (2015). A Generic Feature Selection Method for Background Subtraction Using Global Foreground Models. Advanced Concepts for Intelligent Vision Systems (ACIVS), Catania 26-29 October 2015 (pp. 717-728). Springer.
Peer reviewed
Over the last few years, a wide variety of background subtraction algorithms have been proposed for the detection of moving objects in videos acquired with a static camera. While much effort have been devoted ...
Laugraud, B., Latour, P., & Van Droogenbroeck, M. (2015). Time Ordering Shuffling for Improving Background Subtraction. Advanced Concepts for Intelligent Vision Systems (pp. 58-69). Springer.
Peer reviewed
By construction, a video is a series of ordered frames, whose order is defined at the time of the acquisition process. Background subtraction methods then take this input video and produce a series of ...
Laugraud, B., Pierard, S., Braham, M., & Van Droogenbroeck, M. (2015). Simple Median-Based Method for Stationary Background Generation Using Background Subtraction Algorithms. New Trends in Image Analysis and Processing - ICIAP 2015 Workshops (pp. 477-484). Springer.
Peer reviewed
The estimation of the background image from a video sequence is necessary in some applications. Computing the median for each pixel over time is effective, but it fails when the background is visible for less ...
Pierard, S., & Van Droogenbroeck, M. (2015). A perfect estimation of a background image does not lead to a perfect background subtraction: analysis of the upper bound on the performance. International Conference on Image Analysis and Processing (ICIAP) (pp. 527-534). Springer.
Peer reviewed
The quest for the “best” background subtraction technique is ongoing. Despite that a considerable effort has been undertaken to develop flexible and efficient methods, some elementary questions are still ...
Phan-Ba, R., Giet, A., Pierard, S., & Van Droogenbroeck, M. (2015, April 10). Individual variation of gait parameters along a 500 meter walk in people with multiple sclerosis and healthy volonteers. Poster session presented at 20th Annual Conference of Rehabilitaon In Multiple Sclerosis (RIMS), Milan, Italy.
Peer reviewed
Background: we previously demonstrated the usefulness of the Deceleration Index (DI, the ratio between the last 100m of the Timed 500-Meter Walk test –T500MW – and the walking speed - WS – of the Timed 25 ...
Phan-Ba, R., Pierard, S., Giet, A., & Van Droogenbroeck, M. (2015). Individual variation of gait characteristics along a 500 meter walk in people with multiple sclerosis and healthy volunteers. Multiple Sclerosis Journal, 21(4), 532-533.
Peer reviewed (verified by ORBi)
Background: we previously demonstrated the usefulness of the Deceleration Index (DI, the ratio between the last 100m of the Timed 500-Meter Walk test –T500MW – and the walking speed - WS – of the Timed 25-Foot ...
Braham, M., Lejeune, A., & Van Droogenbroeck, M. (2014). A physically motivated pixel-based model for background subtraction in 3D images. IEEE International Conference on 3D Imaging (IC3D), Liège 9-10 December 2014. Institute of Electrical and Electronics Engineers (IEEE).
Peer reviewed
This paper proposes a new pixel-based background subtraction technique, applicable to range images, to detect motion. Our method exploits the physical meaning of depth information, which leads to an improved ...
Lejeune, A., Grogna, D., Van Droogenbroeck, M., & Verly, J. (2014). Evaluation of pairwise calibration techniques for range cameras and their ability to detect a misalignment. International Conference on 3D Imaging (IC3D) (pp. 1-6).
Peer reviewed
Many applications require the use of multiple cameras to cover a larger volume. In this paper, we evaluate several pair-wise calibration techniques dedicated to range cameras. We compare the precision of a ...
Jodoin, P.-M., Pierard, S., Wang, Y., & Van Droogenbroeck, M. (2014). Overview and Benchmarking of Motion Detection Methods. In Bouwmans, Porikli, Hoferlin, & Vacavant (Eds.), Background Modeling and Foreground Detection for Video Surveillance (9781482205374). Chapman and Hall/CRC.
Peer reviewed
In this chapter, we provide an overview of the most highly cited motion detection meth- ods. We identify the most commonly used background models together with their features, the kind of updating scheme ...
Van Droogenbroeck, M., & Barnich, O. (2014). ViBe: A Disruptive Method for Background Subtraction. In Bouwans, Porikli, Hoferlin, & Vacavant (Eds.), Background Modeling and Foreground Detection for Video Surveillance (pp. 7.1-7.23). Chapman and Hall/CRC.
Peer reviewed
This chapter presents ViBe and the underlying ideas of the algorithm. ViBe is an algorithm for the dection of motion by background subtraction. It is a very fast algorithm, based on samples and several ...
Pierard, S., Marcos Alvarez, A., Lejeune, A., & Van Droogenbroeck, M. (2014). On-the-fly domain adaptation of binary classifiers. 23rd Belgian-Dutch Conference on Machine Learning (BENELEARN) (pp. 20-28).
Peer reviewed
This work considers the on-the-fly domain adaptation of supervised binary classifiers, learned off-line, in order to adapt them to a target context. The probability density functions associated to negative and ...
Pierlot, V., & Van Droogenbroeck, M. (2014). BeAMS: a Beacon based Angle Measurement Sensor for mobile robot positioning. IEEE Transactions on Robotics, 30(30), 533-549.
Peer reviewed (verified by ORBi)
Positioning is a fundamental issue in mobile robot applications, and it can be achieved in multiple ways. Among these methods, triangulation based on angle measurements is widely used, robust, accurate, and ...
Pierlot, V., & Van Droogenbroeck, M. (2014). A New Three Object Triangulation Algorithm for Mobile Robot Positioning. IEEE Transactions on Robotics, 30(3), 566-577.
Peer reviewed (verified by ORBi)
Positioning is a fundamental issue in mobile robot applications. It can be achieved in many ways. Among them, triangulation based on angles measured with the help of beacons is a proven technique. Most of the ...
Osmalsky, J., Van Droogenbroeck, M., & Embrechts, J.-J. (2014). Performances of low-level audio classifiers for large-scale music similarity. International Conference on Systems, Signals and Image Processing (pp. 91-94).
Peer reviewed
This paper proposes a survey of the performances of binary classifiers based on low-level audio features, for music similarity in large-scale databases. Various low-level descriptors are used individually and ...
Pierard, S., Azrour, S., & Van Droogenbroeck, M. (2014). Design of a reliable processing pipeline for the non-intrusive measurement of feet trajectories with lasers. International Conference on Acoustics, Speech, and Signal Processing (ICASSP) (pp. 4432-4436).
Peer reviewed
Reliable measurements of feet trajectories are needed in some applications, such as biomedical applications. This paper describes the data processing pipeline used in GAIMS, which is a non-intrusive system ...
Pierard, S., Phan-Ba, R., & Van Droogenbroeck, M. (2014). Machine learning techniques to assess the performance of a gait analysis system. European Symposium on Artificial Neural Networks, Computational Intelligence and Machine Learning (ESANN) (pp. 419-424).
Peer reviewed
This paper presents a methodology based on machine learning techniques to assess the performance of a system measuring the trajectories of the lower limbs extremities for the follow-up of patients with ...
Azrour, S., Pierard, S., Geurts, P., & Van Droogenbroeck, M. (2014). Data normalization and supervised learning to assess the condition of patients with multiple sclerosis based on gait analysis. European Symposium on Artificial Neural Networks, Computational Intelligence and Machine Learning (ESANN) (pp. 649-654).
Peer reviewed
Gait impairment is considered as an important feature of disability in multiple sclerosis but its evaluation in the clinical routine remains limited. In this paper, we assess, by means of supervised learning ...
Azrour, S., Pierard, S., & Van Droogenbroeck, M. (2013, November 07). Using GAit Measuring System (GAIMS) to discriminate patients with multiple sclerosis from healthy person. Poster session presented at Workshop on measurement : Challenges and Opportunities, Liège, Belgique.
Among voluntary movements, gait is the most affected by multiple sclerosis. Gait impairment is also a good indicator of the disease progression. However, measurement of gait character- istics made by ...
Pierard, S., Azrour, S., & Van Droogenbroeck, M. (2013, November 07). Measuring feet trajectories: challenges and applications. Paper presented at Workshop on measurement : Challenges and Opportunities, Liège, Belgique.
Measuring reliable feet trajectories is needed in many applications. This paper provides the principles used in GAIMS, which is a non-intrusive system that measures feet trajectories based on multiple range ...
PHAN BA, R., Pierard, S., LOMMERS, E., DELRUE, G., CALAY, P., Van Droogenbroeck, M., DELVAUX, V., & MAQUET, P. (2013). Relative Contribution of Walking Speed, Ataxia and Gait asymmetry to the Composition of Gait in Multiple Sclerosis. Multiple Sclerosis Journal, 19(S1), 261.
Peer reviewed
Introduction - Objective: Walking speed measured according to the T25FW is the most widely used descriptor of gait in MS clinical research and practice but other dimensions influencing gait variance exist ...
Pierard, S., Azrour, S., PHAN BA, R., & Van Droogenbroeck, M. (2013). GAIMS: A Reliable Non-Intrusive Gait Measuring System. ERCIM News, 95, 26-27.
Peer reviewed
Gait observation and analysis can provide invaluable information about an individual [1]. Studies that have interpreted gait using traditional imaging devices have demonstrated that it is difficult to make ...
PHAN BA, R., DELRUE, G., Pierard, S., LOMMERS, E., CALAY, P., Van Droogenbroeck, M., & DELVAUX, V. (2013, June 10). Influence of the mode of walk on walking speed in multiple sclerosis: are you walking comfortably? Poster session presented at Twenty-third meeting of the European Neurological Society, Barcelona, Spain.
Peer reviewed
Introduction : Walking speed (WS) is the most frequent gait variable taken into account when measuring gait dysfunction in neurological diseases. Influences of the mode of walk instructed to the subject, i.e ...
Osmalsky, J., Pierard, S., Van Droogenbroeck, M., & Embrechts, J.-J. (2013). Efficient database pruning for large-scale cover song recognition. International Conference on Acoustics, Speech, and Signal Processing (ICASSP). IEEE.
Peer reviewed
This paper focuses on cover song recognition over a large dataset, potentially containing millions of songs. At this time, the problem of cover song recognition is still challenging and only few methods have ...
Pierlot, V., & Van Droogenbroeck, M. (2013). Statistical analysis of modulated codes for robot positioning -- Application to BeAMS.
Positioning is a fundamental issue for mobile robots. Therefore, a performance analysis is suitable to determine the behavior of a system, and to optimize its working. Unfortunately, some systems are only ...
Pierard, S., Pierlot, V., Lejeune, A., & Van Droogenbroeck, M. (2012). I-see-3D! An Interactive and Immersive System that dynamically adapts 2D projections to the location of a user’s eyes. International Conference on 3D Imaging (IC3D) (pp. 8).
Peer reviewed
This paper presents a system that gives the illusion of a 3D immersive and interactive environment with 2D projectors. The user does not need to wear glasses, nor to watch a (limited) screen. The virtual world ...
Van Droogenbroeck, M. (2012). Satellite Communications.
Introduction to satellite communications.
PHAN BA, R., Pierard, S., MOONEN, G., Van Droogenbroeck, M., & Belachew, S. (2012). Detection and Quantification of Efficiency and Quality of Gait Impairment in Multiple Sclerosis through Foot Path Analysis. Multiple Sclerosis Journal, 18(S4), 110.
Peer reviewed (verified by ORBi)
Introduction: Walking speed is generally considered as the best outcome measure in trials for people with multiple sclerosis (pMS). We recently designed a device based on range laser scanner capable to track ...
Lejeune, A., Van Droogenbroeck, M., & Verly, J. (2012). Adaptive bilateral filtering for range images. URSI Benelux Forum 2012 (pp. 1).
Peer reviewed
We propose an improvement for range images of the standard bilateral filter consisting in adapting it locally to the distribution of the range noise at each pixel.
Lejeune, A., Pierard, S., Van Droogenbroeck, M., & Verly, J. (2012). Utilisation de la Kinect. Linux Magazine France, 151, 16-29.
Peer reviewed
Fin 2010, Microsoft lançait la Kinect pour Xbox 360, la première caméra 3D destinée au grand public. Une semaine plus tard sortait la première librairie permettant d'utiliser l'appareil sur un ordinateur ...
Van Droogenbroeck, M., & Paquot, O. (2012). Background Subtraction: Experiments and Improvements for ViBe. Change Detection Workshop (pp. 32-37). IEEE.
Peer reviewed
Motion detection plays an important role in most video based applications. One of the many possible ways to detect motion consists in background subtraction. This paper discusses experiments led for a ...
Osmalsky, J., Embrechts, J.-J., Van Droogenbroeck, M., & Pierard, S. (2012). Neural networks for musical chords recognition. Journées d'informatique musicale (pp. 39-46).
Peer reviewed
In this paper, we consider the challenging problem of music recognition and present an effective machine learning based method using a feed-forward neural network for chord recognition. The method uses the ...
Pierard, S., Lejeune, A., & Van Droogenbroeck, M. (2012). Recognition of emotions in facial images.
This document reports about some work done in the field of emotions classification in facial images.
Pierard, S., & Van Droogenbroeck, M. (2012). Estimation of human orientation based on silhouettes and machine learning principles. International conference on pattern recognition applications and methods (ICPRAM) (pp. 51-60 (in volume 2).
Peer reviewed
Estimating the orientation of the observed person is a crucial task for home entertainment, man-machine interaction, intelligent vehicles, etc. This is possible but complex with a single camera because it only ...
Pierard, S., & Van Droogenbroeck, M. (2012). On the human pose recovery based on a single view. International conference on pattern recognition applications and methods (ICPRAM) (pp. 310-315 (in volume 2).
Peer reviewed
Estimating the pose of the observed person is crucial for a large variety of applications including home entertainment, man-machine interaction, video surveillance, etc. Often, only a single side view is ...
Schadeck, D., & Van Droogenbroeck, M. (2012). Développement d'un prototype exploitant les brevets ViBe et le chiffrement d'images. University of Liège.
This report develops many software enhancements proposed to speed up ViBe, a patented technology designed to detect backgrounds and motion in video sequences. It also elaborates on a technology for the partial encryption of images.
Belachew, S., Pierard, S., PHAN BA, R., & Van Droogenbroeck, M. (2012). Multimodal evaluation of gait and stride dynamics in relapsing and progressive forms of multiple sclerosis. Proceedings of the Belgian Royal Academies of Medicine, 1, 66-69.
Peer reviewed (verified by ORBi)
Ambulation measures are being increasingly recognized as highly relevant to the quantification of multiple sclerosis (MS) severity and response to treatment. Feet paths are highly informative for gait analysis ...
Lejeune, A., Van Droogenbroeck, M., & Verly, J. (2011, December 08). The secrets of the Kinect ... in depth! Paper presented at 3D Stereo Media, Conference of Professional Forum, Liège, Belgium.
The slides present the Kinect in depth. The major technological ideas are explained. In addition, the presentation gives an overview of all the libraries available to interface to the Kinect.
Lejeune, A., Pierard, S., Van Droogenbroeck, M., & Verly, J. (2011). A new jump edge detection method for 3D cameras. International Conference on 3D Imaging (IC3D) (pp. 7). IEEE.
Peer reviewed
Edges is a fundamental clue for analyzing, interpreting, and understanding 3D scenes: they describe objects boundaries. Available edge detection methods are not suited for 3D cameras such as the Microsoft ...
Pierard, S., PHAN BA, R., Van Droogenbroeck, M., & Belachew, S. (2011). A new low-cost and non-intrusive feet tracker. Workshop on Circuits, Systems and Signal Processing (ProRISC) (pp. 382-387).
Capturing gait is useful for many applications, including video-surveillance and medical purposes. The most common sensors used to capture gait suffer from significant drawbacks. We have therefore designed a ...
Van Droogenbroeck, M., & Barnich, O. (2011). Visual Background Extractor. US: U.S. Patent and Trademark Office.
The present invention relates to a Visual Background Extractor (VIBE) consisting in a method for detecting a background in an image selected from a plurality of related images. Each one of said set of images ...
Pierard, S., Leroy, D., Hansen, J.-F., & Van Droogenbroeck, M. (2011). Estimation of human orientation in images captured with a range camera. Advanced Concepts for Intelligent Vision Systems (ACIVS) (pp. 519-530). Springer.
Peer reviewed
Estimating the orientation of the observed person is a crucial task for some application fields like home entertainment, man-machine interaction, or intelligent vehicles. In this paper, we discuss the ...
Pierlot, V., & Van Droogenbroeck, M. (2011). Analysis of a robot positioning system based on a rotating receiver, beacons, and coded signals. Proceedings of the European Signal Processing Conference (EUSIPCO) (pp. 1766-1770).
Peer reviewed
Positioning is a fundamental issue in mobile robot applications that can be achieved in multiple ways. Among these methods, triangulation with active beacons is widely used, robust, accurate, and flexible. In ...
Van Droogenbroeck, M., & Pierard, S. (2011). Object descriptors based on a list of rectangles: method and algorithm. In Soille (Ed.), International Symposium on Mathematical Morhology (ISMM) (pp. 155-165). Berlin: Springer-Verlag.
Peer reviewed
Most morphological operators use a unique structuring element, possibly at different scales, to describe an object. In addition, morphological algorithms are often restricted to 1D structuring elements ...
Van Droogenbroeck, M., & Barnich, O. (2011). Visual background extractor. JP: Japan Patent Office.
The present invention relates to a VIsual Background Extractor ( VIBE ) consisting in a method for detecting a background in an image selected from a plurality of related images. Each one of said set of images ...
Barnich, O., & Van Droogenbroeck, M. (2011). ViBe: A universal background subtraction algorithm for video sequences. IEEE Transactions on Image Processing, 20(6), 1709-1724.
Peer reviewed (verified by ORBi)
This paper presents a technique for motion detection that incorporates several innovative mechanisms. For example, our proposed technique stores, for each pixel, a set of values taken in the past at the same ...
Pierlot, V., Van Droogenbroeck, M., & Urbin-Choffray, M. (2011). A new three object triangulation algorithm based on the power center of three circles. Research and Education in Robotics (EUROBOT) (pp. 248-262). Springer.
Peer reviewed
Positioning is a fundamental issue in mobile robot applications that can be achieved in multiple ways. Among these methods, triangulation is a proven technique. As it exists for a long time, many variants of ...
Pierard, S., Lejeune, A., & Van Droogenbroeck, M. (2011). A probabilistic pixel-based approach to detect humans in video streams. International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2011) (pp. 921-924). IEEE.
Peer reviewed
Human detection in video streams is an important task in many applications including video surveillance. Surprisingly, only few papers have been devoted to this topic. This paper presents a new approach to ...
Barnich, O., Pierard, S., & Van Droogenbroeck, M. (2010). A virtual curtain for the detection of humans and access control. Advanced Concepts for Intelligent Vision Systems (ACIVS) (pp. 98-109).
Peer reviewed
Biometrics has become a popular field for the development of techniques that aim at recognizing humans based upon one or more intrinsic physical or behavioral traits. In particular, many solutions dedicated to ...
Pierard, S., Lejeune, A., & Van Droogenbroeck, M. (2010). 3D information is valuable for the detection of humans in video streams. 3D Stereo Media.
Peer reviewed
In this paper, we propose a technique based on 3D information (also called depth or range) for the detection of humans. First, a background subtraction technique operates to detect the silhouettes of humans ...
Pierlot, V., Tassin, P., & Van Droogenbroeck, M. (2010). A new precise ultrasonic range sensor based on the emission of two coded FSK signals combined to a ping-pong strategy. Conference on Research in Information and communication Technology (pp. 36-39).
Ultrasonic range sensors are widely used in robotic applications mainly for obstacle avoidance or environment map generation. They are attractive because of the low cost of the transducers, associated ...
Pierard, S., Pierlot, V., Barnich, O., Van Droogenbroeck, M., & Verly, J. (2010). A platform for the fast interpretation of movements and localization of users in 3D applications driven by a range camera. Proceedings of the 3DTV Conference (pp. 4).
Peer reviewed
Interactivity is one of the key challenges for immersive applications like gaming. Manufacturers have been working towards interfaces that are driven by a device (e.g. a Wiimote) or interfaces that are ...
Van Droogenbroeck, M., & Barnich, O. (2010). Visual background extractor. Europe: European Patent Office.
The present invention relates to a Visual Background Extractor ( VIBE ) consisting in a method for detecting a background in an image selected from a plurality of related images. Each one of said set of images ...
Borghgraef, A., Barnich, O., Lapierre, F., Van Droogenbroeck, M., Philips, W., & Acheroy, M. (2010). An evaluation of pixel-based methods for the detection of floating objects on the sea surface. EURASIP Journal on Advances in Signal Processing, 2010, 11.
Peer reviewed (verified by ORBi)
Ship-based automatic detection of small floating objects on an agitated sea surface remains a hard problem. Our main concern is the detection of floating mines, which proved a real threat to shipping in ...
Géraud, T., Talbot, H., & Van Droogenbroeck, M. (2010). Morphologie et Algorithmes. Morphologie mathématique 2: estimation, choix et mise en oeuvre (pp. 151-180). Paris, France: Lavoisier.
Peer reviewed
Ce chapitre aborde le problème important de la mise en oeuvre des opérateurs, filtres et méthodologies d'analyse d'images.
Pierard, S., Leens, J., & Van Droogenbroeck, M. (2009, November). Real-time processing of depth and color video streams to improve the reliability of depth maps. Poster session presented at 3D Stereo Media, Liège, Belgium.
Depth is a useful information in vision to understand the geometrical properties of an environment. Depth is traditionally computed in terms of a disparity map acquired by a stereoscopic system but, over ...
Pierard, S., & Van Droogenbroeck, M. (2009). A technique for building databases of annotated and realistic human silhouettes based on an avatar. Annual Workshop on Circuits, Systems and Signal Processing (ProRISC) (pp. 243-246).
The real-time interpretation of video scenes and human motion is a research field with a lot of applications. Awidely used pre-processing step is the background subtraction, which highlights silhouettes. In ...
Pierard, S., & Van Droogenbroeck, M. (2009, November). Techniques to improve the foreground segmentation with a 3D camera and a color camera.
Nowadays, techniques for real-time interpretation of video scenes are widespread. Amongst these techniques, the foreground segmentation is one of the favorite. It can be applied to color images as well as ...
Pierlot, V., & Van Droogenbroeck, M. (2009). A simple and low cost angle measurement system for mobile robot positioning. Workshop on Circuits, Systems and Signal Processing (ProRISC) (pp. 251-254).
Positioning is a fundamental issue in mobile robot applications that can be achieved in multiple ways. Among these methods, triangulation with active beacons is widely used, robust, accurate, and flexible ...
Barnich, O., & Van Droogenbroeck, M. (2009). Classification of scenarios for persons crossing a door frame based on the joint measurements of two radial distance sensors.
This report is the final report concerning the research project that involved the TELIM group from the University of Liège and BEA, a Belgian company active, among others, in the design and manufacturing of devices for people and vehicle detection.
Leens, J., Pierard, S., Barnich, O., Van Droogenbroeck, M., & Wagner, J.-M. (2009). Combining Color, Depth, and Motion for Video Segmentation. Computer Vision Systems (pp. 104-113). Springer.
Peer reviewed
This paper presents an innovative method to interpret the content of a video scene using a depth camera. Cameras that provide distance instead of color information are part of a promising young technology ...
Van Droogenbroeck, M. (2009). Anchors of morphological operators and algebraic openings. In P., Hawkes (Ed.), Advances in Imaging and Electron Physics (pp. 173-201). Elsevier.
Peer reviewed
Opening and closing operators play an important role in the field of mathematical morphology, mainly because of their useful property of idempotence, which is similar to the notion of ideal filter in linear ...
Barnich, O., & Van Droogenbroeck, M. (2009). Design of a morphological moving object signature and application to human identification. International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2009) (pp. 853-856).
Peer reviewed
Many computer vision systems try to infer semantic information about a video scene content by looking at the time series of the silhouettes of the moving objects. This paper proposes a new inter-frame ...
Barnich, O., & Van Droogenbroeck, M. (2009). ViBe: a powerful random technique to estimate the background in video sequences. International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2009) (pp. 945-948).
Peer reviewed
Background subtraction is a crucial step in many automatic video content analysis applications. While numerous acceptable techniques have been proposed so far for background extraction, there is still a need ...
Van Droogenbroeck, M., & Barnich, O. (2009). Visual Backgound Extractor. BE: World Intellectual Property Organisation.
ViBe is a powerful pixel-based technique that detects the background in video sequences. Many experiments have shown that it performs better than the state-of-the-art techniques known in the scientific ...
Barnich, O., & Van Droogenbroeck, M. (2009). Frontal-view gait recognition by intra- and inter-frame rectangle size distribution. Pattern Recognition Letters, 30, 893-901.
Peer reviewed (verified by ORBi)
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 ...
Dardenne, R., Embrechts, J.-J., Van Droogenbroeck, M., & Werner, N. (2006). A video-based human-computer interaction system for audio-visual immersion. Proceedings of SPS-DARTS (pp. 23-26).
Peer reviewed
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 ...
Barnich, O., JODOGNE, S., & Van Droogenbroeck, M. (2006). Robust analysis of silhouettes by morphological size distributions. Lecture Notes in Computer Science, 4179, 734-745.
Peer reviewed
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 ...
Dardenne, R., & Van Droogenbroeck, M. (2006). libmorpho: a library for mathematical morphology.
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 ...
Demoulin, C., & Van Droogenbroeck, M. (2005). A method based on multiple adaptive windows to improve the determination of disparity maps. ProRISC/IEEE Workshop on Circuit, Systems and Signal Processing (pp. 615-618).
Peer reviewed
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 ...
Dardenne, R., Embrechts, J.-J., Van Droogenbroeck, M., & Werner, N. (2005). The CINEMA Project: A Video-Based Human-Computer Interaction System for Audio-Visual Immersion. ERCIM News, 62, 45-46.
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 ...
Van Droogenbroeck, M., & Buckley, M. (2005). Morphological erosions and openings: fast algorithms based on anchors. Journal of Mathematical Imaging and Vision, 22(2-3), 121-142.
Peer reviewed (verified by ORBi)
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 ...
Dardenne, R., & Van Droogenbroeck, M. (2005). Acquisition vidéo au moyen d'une caméra IEEE 1394. Linux Magazine, 69, 54-59.
Peer reviewed
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 ...
Van Droogenbroeck, M., & Barnich, O. (2005). Design of statistical measures for the assessment of image segmentation schemes. International Conference on Computer Analysis of Images and Patterns (CAIP 2005) (pp. 280-287). Berlin: Springer-Verlag Berlin.
Peer reviewed
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 ...
Van Droogenbroeck, M. (2004). Partial encryption of images for real-time applications. Fourth IEEE Signal Processing Symposium (pp. 11-15).
Peer reviewed
Multimedia systems mostly base security on a restricted access to services. In the context of real-time imaging applications, this model suffers several drawbacks. Applications become vulnerable to password ...
Demoulin, C., & Van Droogenbroeck, M. (2004). Principes de base du fonctionnement du réseau GSM. Revue de l'AIM, 4, p. 3-18.
Si la téléphonie mobile se banalise aujourd'hui, on le doit à la conjonction de l'avènement du numérique, à l'accroissement des performances des semi-conducteurs et à différentes avancées technologiques. Mais ...
Van Droogenbroeck, M., & Talbot, H. (2003). Segmentation by adaptive prediction and region merging. Digital Image Computing Techniques and Applications, Volume II (pp. 561-570).
Peer reviewed
This paper presents a segmentation technique based on prediction and adaptive region merging. While many techniques for segmentation exist, few of them are suited for the segmentation of natural images ...
Lapierre, F., Van Droogenbroeck, M., & Verly, J. (2003). New Solutions to the Problem of Range Dependence in Bistatic STAP Radars. IEEE Radar Conference 2003, Proceedings (pp. 452-459).
Peer reviewed
We address the problem of detecting slow-moving <br />targets using a space-time adaptive processing (STAP) radar. <br />The construction of optimum weights at each range implies <br />the estimation of the ...
Lapierre, F., Van Droogenbroeck, M., & Verly, J. (2003). New methods for handling the range dependence of the clutter spectrum in non-sidelooking monostatic STAP radars. International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2003), Proceedings, Volume 5 (pp. 73-76).
Peer reviewed
We address the problem of detecting slow-moving targets using a non-sideloking monostatic space-time adaptive processing (STAP) radar. The construction of optimum weights at each range implies the estimation ...
Vanderheyden, B., & Van Droogenbroeck, M. (2002). Étude de la paradiaphonie (NEXT) au sein de câbles composés de paires torsadées.
Le réseau téléphonique est constitué d’une succession de câbles mis bout à bout et interconnectés au droit des répartiteurs. Cette hétérogénéité de câblage n’est guère favorable pour la réduction des ...
Van Droogenbroeck, M., & Benedett, R. (2002). Techniques for a selective encryption of uncompressed and compressed images. ACIVS Advanced Concepts for Intelligent Vision Systems, Proceedings (pp. 90-97).
Peer reviewed
This paper describes several techniques to encrypt uncompressed and compressed images. We first present the aims of image encryption. In the usual ways to encryption, all the information is encrypted. But this ...
Van Droogenbroeck, M. (2002). Algorithms for openings of binary and label images with rectangular structuring elements. In H., Talbot & R., Beare (Eds.), International Symposium on Mathematical morphology (ISMM) (pp. 197-207).
Peer reviewed
Two new families of algorithms for computing openings of binary and label images are presented in this paper. The first family of algorithms is based on an horizontal scan, and a vertical scan that takes the ...
Van Droogenbroeck, M., & Delvaux, J. (2002). An entropy based technique for information embedding in images. IEEE Signal Processing Symposium, Proceedings (pp. 81-84).
Peer reviewed
Many information hiding techniques have recently been analyzed as they could help manage part of the digital rights. Among the general framework of information hiding, the focus has been put on ...
De Praetere, J., Maricau, P., & Van Droogenbroeck, M. (1998). Data networks integration. 37th European Telecommunications Congress, Volume 17 (pp. 128-131).
Peer reviewed
This paper discusses the role of data networks integration on an asynchronous transfer mode (ATM) core and compares the advantages achieved by the usage of ATM with those given by emerging technologies ...
Van Droogenbroeck, M. (1993). Morphologie à seuillage: application au lissage des formes (N-31/03/MM). Fontainebleau, France: École des Mines de Paris, Centre de Morphologie Mathématique.
La morphologie mathématique englobe différentes techniques de filtrage aussi variées qu'originales. Parmi l'imposante panoplie des filtres se distinguent ceux qui sont nés de la morphologie à seuillage, encore ...
Van Droogenbroeck, M. (1992). Generalized iterative algorithm for spectral signal deconvolution. Sixth European Signal Processing Conference (EURASIP) (pp. 1389-1392). EURASIP.
Peer reviewed
A generalized iterative algorithm for spectral signal deconvolution is presented in this paper. It works for signals characterized by a small number of spectral components. The algorithm combines the selective ...