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1. Report on ECIR 2016: 38th European Conference on Information Retrieval

Author

Jaana Kekäläinen, Giorgio Maria Di Nunzio, Fabrizio Silvestri, Nicola Ferro, Fabio Crestani, Gabriella Pasi, Paolo Rosso, Stefano Mizzaro, Gianmaria Silvello, Paul Clough, Christina Lioma, Marie-Francine Moens, Omar Alonso, Claudia Hauff, Pavel Serdyukov, Josiane Mothe, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), University of Sheffield (UNITED KINGDOM), Università degli Studi di Milano-Bicocca - BICOCCA (ITALY), Delft University of Technology - TU Delft (NETHERLANDS), Microsoft (USA), Københavns Universitet - KU (DENMARK), Katholieke Universiteit Leuven - KU LEUVEN (BELGIUM), Università degli Studi di Padova (ITALY), University of Tampere - UTA (FINLAND), Università degli studi di Udine - UNIUD (ITALY), Universidad Politecnica de Valencia (SPAIN), Yahoo ! (USA), Yandex (RUSSIA), Institut de Recherche en Informatique de Toulouse - IRIT (Toulouse, France), Universita degli Studi di Padova, Università della Svizzera italiana = University of Italian Switzerland (USI), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Systèmes d’Informations Généralisées (IRIT-SIG), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse - Jean Jaurès (UT2J), Yahoo! Labs, University of Tampere [Finland], Universitat Politècnica de València (UPV), University of Sheffield [Sheffield], Università degli Studi di Milano-Bicocca [Milano] (UNIMIB), University of Copenhagen = Københavns Universitet (KU), Università degli Studi di Udine - University of Udine [Italie], Delft University of Technology (TU Delft), BING - Microsoft, Yandex [Moscou], and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)

Subjects
Théorie de l'information, ECIR, Information retrieval, Computer science, Information Retrieval, Report, ECIR, 05 social sciences, Recherche d'information, 02 engineering and technology, Management Information Systems, SIGEVI, Hardware and Architecture, [INFO.INFO-IT]Computer Science [cs]/Information Theory [cs.IT], Report, 020204 information systems, [INFO.INFO-IR]Computer Science [cs]/Information Retrieval [cs.IR], Information Retrieval, 0202 electrical engineering, electronic engineering, information engineering, 0509 other social sciences, 050904 information & library sciences, ComputingMilieux_MISCELLANEOUS
Abstract

International audience; The 38th European Conference on Information Retrieval took place from the 20th to the 23rd of March 2016 in Padua, Italy. This report summarizes the conference in terms of the presented keynotes, scientific and social programme, industry day, tutorials, workshops and student support.

Published
2016

2. Jack-of-all-trades effects drive biodiversity-ecosystem multifunctionality relationships in European forests

Author

Van der Plas, Fons, Manning, Peter, Allan, Eric, Scherer-Lorenzen, Michael, Verheyen, Kris, Wirth, Christian, Zavala, Miguel Angel, Hector, Andy, Ampoorter, Evy, Baeten, Lander, Barbaro, Luc, Bauhus, Jürgen, Benavides, Raquel, Benneter, Adam, Berthold, Felix, Bonal, Damien, Bouriaud, Olivier, Bruelheide, Helge, Bussotti, Filippo, Carnol, Monique, Castagneyrol, Bastien, Charbonnier, Yohan, Coomes, David, Coppi, Andrea, Bastias, Cristina C., Muhie Dawud, Seid, De Wandeler, Hans, Domisch, Timo, Finér, Leena, Gessler, Arthur, Granier, André, Grossiord, Charlotte, Guyot, Virginie, Hättenschwiler, Stephan, Jactel, Hervé, Jaroszewicz, Bogdan, Joly, François-Xavier, Jucker, Tommaso, Koricheva, Julia, Milligan, Harriet, Müller, Sandra, Muys, Bart, Nguyen, Diem, Pollastrini, Martina, Raulund-Rasmussen, Karsten, Selvi, Federico, Stenlid, Jan, Valladares, Fernando, Vesterdal, Lars, Zielínski, Dawid, Fischer, Markus, Universidad de Alcalá. Departamento de Ciencias de la Vida, Bouriaud, Olivier [0000-0002-8046-466X], Nguyen, Diem [0000-0002-9680-5772], Apollo - University of Cambridge Repository, University of Bern, Senckenberg biodiversität und klima forschungszentrum (BIK-F), Forschungsinstitut Senckenberg (SGN), University of Freiburg [Freiburg], Universiteit Gent = Ghent University [Belgium] (UGENT), Universität Leipzig [Leipzig], German Centre for Integrative Biodiversity Research (iDiv), Universidad de Alcalá - University of Alcalá (UAH), University of Oxford [Oxford], Biodiversité, Gènes & Communautés (BioGeCo), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB), Martin-Luther-Universität Halle Wittenberg (MLU), Ecologie et Ecophysiologie Forestières [devient SILVA en 2018] (EEF), Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL), Universitatea Stefan cel Mare Suceava (USU), Università degli Studi di Firenze = University of Florence [Firenze] (UNIFI), Université de Liège, University of Cambridge [UK] (CAM), Museo Nacional de Ciencias Naturales (MNCN), University of Copenhagen = Københavns Universitet (KU), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Natural Resources Institute Finland (LUKE), Institut fédéral de recherches WSL, Los Alamos National Laboratory (LANL), Dynamiques Forestières dans l'Espace Rural (DYNAFOR), Institut National de la Recherche Agronomique (INRA)-École nationale supérieure agronomique de Toulouse [ENSAT]-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Centre d’Ecologie Fonctionnelle et Evolutive (CEFE), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Université Paul-Valéry - Montpellier 3 (UPVM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut de Recherche pour le Développement (IRD [France-Sud]), Uniwersytet Warszawski, Royal Holloway [University of London] (RHUL), Swedish University of Agricultural Sciences (SLU), Universidad Rey Juan Carlos [Madrid] (URJC), Universiteit Gent = Ghent University (UGENT), Universität Leipzig, University of Oxford, Università degli Studi di Firenze = University of Florence (UniFI), Museo Nacional de Ciencias Naturales [Madrid] (MNCN), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), University of Copenhagen = Københavns Universitet (UCPH), Institut National de la Recherche Agronomique (INRA)-École nationale supérieure agronomique de Toulouse (ENSAT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT), Université Paul-Valéry - Montpellier 3 (UPVM)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Universiteit Gent [Ghent], Università degli Studi di Firenze [Firenze], Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure Agronomique de Toulouse-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Paul-Valéry - Montpellier 3 (UM3)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École pratique des hautes études (EPHE)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Biodiversität und Klima Forschungszentrum - BiK-F (GERMANY), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut National de la Recherche Agronomique - INRA (FRANCE), Martin-Luther-Universität Halle-Wittenberg - MLU (GERMANY), Universidad de Alcalá - UAH (SPAIN), Université de Bordeaux 1 (FRANCE), University of Cambridge (UNITED KINGDOM), Universidad Rey Juan Carlos - URJC (SPAIN), Universitatea Stefan cel Mare Suceava - USU (ROMANIA), Université de Liège (BELGIUM), Royal Holloway University of London - RHUL (UNITED KINGDOM), German Centre for Integrative Biodiversity Research - iDiv (GERMANY), Los Alamos National Laboratory - LANL (USA), Universität Leipzig (GERMANY), Luonnonvarakeskus - LUKE (FINLAND), Museo Nacional de Ciencias Naturales (SPAIN), Sveriges lantbruksuniversitet - SLU (SWEDEN), Forschungsanstalt für Wald, Schnee und Landschaft - WSL (SWITZERLAND), Universiteit Gent - UGENT (BELGIUM), University of Bern (SWITZERLAND), Københavns Universitet - KU (DENMARK), Università degli Studi di Firenze (ITALY), Universität Freiburg (GERMANY), Katholieke Universiteit Leuven - KU LEUVEN (BELGIUM), Université de Lorraine (FRANCE), University of Oxford (UNITED KINGDOM), Uniwersytet Warszawski - UW (POLAND), Biodiversité Gènes et Communautés - BIOGECO (Bordeaux, France), Ecologie et Ecophysiologie Forestières - EEF (Champenoux, France), Dynamiques et Ecologie des Paysages Agriforestiers - DYNAFOR (Castanet-Tolosan, France), and Institut National Polytechnique de Toulouse - INPT (FRANCE)

Subjects
0106 biological sciences, 010504 meteorology & atmospheric sciences, Biodiversité et Ecologie, Biodiversity, SOIL MICROBIAL BIOMASS, General Physics and Astronomy, 580 Plants (Botany), Forests, 01 natural sciences, Ecosystem services, biodiversité, Trees, CARBON, [SDV.SA.SF]Life Sciences [q-bio]/Agricultural sciences/Silviculture, forestry, Multidisciplinary, CHALLENGES, Ecology, SPECIES RICHNESS, STATISTICAL INEVITABILITY, Europe, Biological sciences, Ecosystèmes, Multifunctionality, Biodiversité, Science, [SDV.BID]Life Sciences [q-bio]/Biodiversity, Biology, 010603 evolutionary biology, écosystème, General Biochemistry, Genetics and Molecular Biology, Article, Environmental science, multifonctionalité, Biodiversity and Ecology, [SDV.EE.ECO]Life Sciences [q-bio]/Ecology, environment/Ecosystems, Sylviculture, foresterie, Species Specificity, Forest ecology, Ecosystem, 0105 earth and related environmental sciences, PLANT DIVERSITY, Mechanism (biology), Environmental and Society, CURRENT KNOWLEDGE, General Chemistry, 15. Life on land, SERVICES, Models, Theoretical, EXTRACTION METHOD, NITROGEN, Medio Ambiente, Biochemistry, Genetics and Molecular Biology (all), Chemistry (all), Physics and Astronomy (all), Complementarity (molecular biology), Earth and Environmental Sciences, Spatial ecology, Species richness, Environnement et Société
Abstract

Fons van der Plas [et al.].- Received 8 September 2015, Accepted 19 February 2016, Published 24 March 2016, There is considerable evidence that biodiversity promotes multiple ecosystem functions (multifunctionality), thus ensuring the delivery of ecosystem services important for human well-being. However, the mechanisms underlying this relationship are poorly understood, especially in natural ecosystems. We develop a novel approach to partition biodiversity effects on multifunctionality into three mechanisms and apply this to European forest data. We show that throughout Europe, tree diversity is positively related with multifunctionality when moderate levels of functioning are required, but negatively when very high function levels are desired. For two well-known mechanisms, ‘complementarity’ and ‘selection’, we detect only minor effects on multifunctionality. Instead a third, so far overlooked mechanism, the ‘jack-of-all-trades’ effect, caused by the averaging of individual species effects on function, drives observed patterns. Simulations demonstrate that jack-of-all-trades effects occur whenever species effects on different functions are not perfectly correlated, meaning they may contribute to diversity–multifunctionality relationships in many of the world’s ecosystems.

Published
2016

3. A L1-TV Algorithm for Robust Perspective Photometric Stereo with Spatially-Varying Lightings

Author

François Lauze, Yvain Quéau, Jean-Denis Durou, Real Expression Artificial Life (IRIT-REVA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, University of Copenhagen = Københavns Universitet (KU), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Københavns Universitet - KU (DENMARK), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)

Subjects
Perspective projection, Computer science, 02 engineering and technology, Proximal methods, Classification of discontinuities, 01 natural sciences, [INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI], Traitement des images, [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, 0202 electrical engineering, electronic engineering, information engineering, Traitement du signal et de l'image, Computer vision, 0101 mathematics, Synthèse d'image et réalité virtuelle, Uncalibrated photometric stereo, Total variation, business.industry, Perspective (graphical), [INFO.INFO-CV]Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV], Vision par ordinateur et reconnaissance de formes, Intelligence artificielle, [INFO.INFO-GR]Computer Science [cs]/Graphics [cs.GR], 010101 applied mathematics, Normal field, Photometric stereo, Spatialisation, [INFO.INFO-TI]Computer Science [cs]/Image Processing [eess.IV], Outlier, Spatially-varying lightings, 020201 artificial intelligence & image processing, Artificial intelligence, business, Algorithm
Abstract

International audience; We tackle the problem of perspective 3D-reconstruction of Lambertian surfaces through photometric stereo, in the presence of outliers to Lambert’s law, depth discontinuities, and unknown spatially-varying lightings. To this purpose, we introduce a robust L1-TV variational formulation of the recovery problem where the shape itself is the main unknown, which naturally enforces integrability and permits to avoid integrating the normal field.

Published
2015

4. Solving Uncalibrated Photometric Stereo using Total Variation

Author

François Lauze, Jean-Denis Durou, Yvain Quéau, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Københavns Universitet - KU (DENMARK), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Real Expression Artificial Life (IRIT-REVA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, and University of Copenhagen = Københavns Universitet (KU)

Subjects
Statistics and Probability, Computer science, Photometric stereo, media_common.quotation_subject, Generalized bas-relief ambiguity, Variation (game tree), [INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI], Traitement des images, [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, Traitement du signal et de l'image, Computer vision, Synthèse d'image et réalité virtuelle, media_common, Total variation, 3D-reconstruction, business.industry, Applied Mathematics, [INFO.INFO-CV]Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV], Ambiguity, Vision par ordinateur et reconnaissance de formes, Intelligence artificielle, Condensed Matter Physics, Object (computer science), [INFO.INFO-GR]Computer Science [cs]/Graphics [cs.GR], Modeling and Simulation, [INFO.INFO-TI]Computer Science [cs]/Image Processing [eess.IV], Geometry and Topology, Computer Vision and Pattern Recognition, Artificial intelligence, business
Abstract

International audience; Estimating the shape and appearance of an object, given one or several images, is still an open and challenging research problem called 3D-reconstruction. Among the different techniques available, photometric stereo (PS) produces highly accurate results when the lighting conditions have been identified. When these conditions are unknown, the problem becomes the so-called uncalibrated PS problem, which is ill-posed. In this paper, we will show how total variation can be used to reduce the ambiguities of uncalibrated PS, and we will study two methods for estimating the parameters of the generalized bas-relief ambiguity. These methods will be evaluated through the 3D-reconstruction of real-world objects.

Published
2015

5. Solving the Uncalibrated Photometric Stereo Problem using Total Variation

Author

Jean-Denis Durou, Yvain Quéau, François Lauze, Visual Objects from Reality To Expression (IRIT-VORTEX), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, University of Copenhagen = Københavns Universitet (KU), Traitement et Compréhension d’Images (IRIT-TCI), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Københavns Universitet - KU (DENMARK), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)

Subjects
Generalized bas-relief, Computer science, media_common.quotation_subject, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, 02 engineering and technology, Variation (game tree), 01 natural sciences, [INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI], 010309 optics, Traitement des images, [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Traitement du signal et de l'image, Computer vision, Synthèse d'image et réalité virtuelle, Uncalibrated photometric stereo, media_common, ComputingMethodologies_COMPUTERGRAPHICS, State-of-the-art algorithms, business.industry, Piecewise smoothness, [INFO.INFO-CV]Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV], Vision par ordinateur et reconnaissance de formes, Ambiguity, Intelligence artificielle, Total variation denoising, Albedo, Real image, [INFO.INFO-GR]Computer Science [cs]/Graphics [cs.GR], Normal field, Photometric stereo, Computer Science::Computer Vision and Pattern Recognition, [INFO.INFO-TI]Computer Science [cs]/Image Processing [eess.IV], 020201 artificial intelligence & image processing, Artificial intelligence, business
Abstract

International audience; In this paper we propose a new method to solve the problem of uncalibrated photometric stereo, making very weak assumptions on the properties of the scene to be reconstructed. Our goal is to solve the generalized bas-relief ambiguity (GBR) by performing a total variation regularization of both the estimated normal field and albedo. Unlike most of the previous attempts to solve this ambiguity, our approach does not rely on any prior information about the shape or the albedo, apart from its piecewise smoothness. We test our method on real images and obtain results comparable to the state-of-the-art algorithms.

Published
2013

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