RecPad 2025

31st edition of the Portuguese Conference On Pattern Recognition

RECPAD is the annual Portuguese Conference on Pattern Recognition.

It is a one-day event, aimed at promoting cooperation and exchange among the Portuguese scientific community in the fields of Pattern Recognition, Image Analysis and Processing, Soft Computing, and related areas.

Orador convidado

Mihaela van der Schaar

Prof Mihaela van der Schaar

RecPad 2024

30th edition of the Portuguese Conference On Pattern Recognition

RECPAD is the annual Portuguese Conference on Pattern Recognition.

It is a one-day event, aimed at promoting cooperation and exchange among the Portuguese scientific community in the fields of Pattern Recognition, Image Analysis and Processing, Soft Computing, and related areas.

This 30th edition is organized by Universidade da Beira Interior (UBI) and supported by the Portuguese Association for Pattern Recognition (APRP).

Orador convidado

Ruben Vera Rodríguez – Professor at the Autonomous University of Madrid and member of the BiDA Lab

https://www.researchgate.net/profile/Ruben-Vera-Rodriguez

Title
Advances in Behavioral Mobile Biometrics and in Face Recognition through AI Generated Images

Biography
Ruben Vera Rodríguez is a renowned computer scientist and pioneer in the fields of behavioral mobile biometrics and AI-generated facial recognition. He is currently an Associate Professor at the Autonomous University of Madrid and member of the BiDA Lab, focused on forensics and biometrics for security and human behavior analysis. He is author of more than 150 scientific articles published in international journals and conferences. He has served as Program Chair for some international conferences such as: IEEE ICCST 2017, CIARP 2018, ICBEA 2019 and AVSS 2022. He has also organized several workshops and challenges in top conferences such as WAMWB (MobileHCI 2023), KVC (BigData 2023), MobileB2C (IJCB 2022) and SVC-onGoing (ICDAR 2021). Ruben has received a Medal in the Young Researcher Awards 2022 by the Spanish Royal Academy of Engineering among other awards, and he is member of ELLIS Society since 2023.

RecPad 2023

29th edition of the Portuguese Conference On Pattern Recognition

RECPAD is the annual Portuguese Conference on Pattern Recognition.

It is a one-day event, aimed at promoting cooperation and exchange among the Portuguese scientific community in the fields of Pattern Recognition, Image Analysis and Processing, Soft Computing, and related areas.

This 29th edition is organized by ISEC (Coimbra Institute of Engineering) and supported by the Portuguese Association for Pattern Recognition (APRP).

The conference will feature an invited talk, oral and poster presentations, and several networking opportunities throughout the day.

Orador convidado

Anna M. Bianchi
Politecnico di Milano, Italy
WEBAnna M. Bianchi is full professor in Biomedical Engineering at the Department of Electronics, Information and Bioengineering of the Politecnico di Milano. She received the Laurea in Electronic Engineering from the same University. In the period 1987-2000 she was research assistant in the Lab. of Biomedical Engineering of the IRCCS S.Raffaele Hospital in Milano; in 2001 joined the Department of Biomedical Engineering of the Politecnico di Milano. Her teaching activities are in the field of Biomedical Signal Processing (Bachelor degree) and Medical Informatics (Master degree).

Rui Lopes
Critical Software, Portugal
WEBRui Lopes is the Principal AI Engineer at Critical Software, serving as the technical lead and technical manager for R&D and client Artificial Intelligence projects. He holds a PhD in Artificial Intelligence from the University of Coimbra, where he researched indirect representations for Genetic Programming. He incepted his career at Critical Software in 2007 in a Defence project, and later joined the European Space Agency where he developed an end-to-end AI application for Operations Research. After completing his doctoral degree he joined INESC-TEC as a post-doc fellow, where he built on his track-record of inter-disciplinary research developing end-to-end AI solutions for logistics management in Healthcare and the Pharmaceutical industry, for the Oil and Gas industry, and for Precision Agriculture. After 10 years in the academy he re-joined Critical Software, where he has been working on AI solutions for Fintech, Insurtech, Smart Buildings, amongst others.

RecPad 2022

28th edition of the Portuguese Conference On Pattern Recognition

RECPAD 2022

RECPAD is the annual Portuguese Conference on Pattern Recognition, sponsored by APRP (Portuguese Association for Pattern Recognition). It is a one-day conference to promote the collaboration between the Portuguese scientific community in the fields of Pattern Recognition, Image Analysis and Processing, Soft Computing, and related areas. This year, RECPAD2022 will be held and sponsored by ESTG (School of Technology and Management – Politécnico de Leiria), on October 28^th, 2022.

Orador convidado

Bio

Jochen Hemming is holding a Ph.D. degree in horticultural science from the University of Hanover, Germany. Since 2000 he works with Wageningen University & Research (WUR) in the Netherlands. WUR is a world-renowned centre that combines fundamental and applied research in the areas of food, agrotechnology, production systems, nature and the environment. Jochen is currently appointed as senior researcher computer vision and robotics in horticulture. He is member of the Wageningen Agro Food Robotics program, a program that is specialized in robotics and computer vision projects (https://www.wur.nl/en/research-results/projects-and-programmes/agro-food-robotics.htm). He currently works as PI on large national and European projects on robotic harvesting and plant manipulation and is project leader of a number of national research projects with strong involvement of companies and industry. His research interests include computer vision, artificial intelligence, agro-robotics and automation in plant production.

Título

Deep learning and its application in horticulture and agriculture

Abstract

Due to the natural variation of the objects and of the environment the implementation of computer vision in horticulture and agriculture is more demanding than in traditional industries like the automotive or the semiconductor sector. The use of neural networks and deep learning algorithms for 2D and 3D image analysis has been proven to be very successful over the past years. Research is for example performed on the detection of insects with object detection methods. Insect populations are commonly monitored by greenhouse growers manually observing the type and number of insects. By automating the process of imaging and identification, this monitoring process can be eased and sped up. Semantic segmentation methods are used to quantify areas on leaves that show symptoms of specific pests or diseases. A research prototype for robotic harvesting of sweet peppers in greenhouses uses deep-learning methods to detect and localize ripe fruit. The network has also been trained to detect and avoid obstacles with the robotic arm, such as leaves and plant stems. Other harvesting robots target apples and pears in the orchard. In the open field, precision farming projects are using camera-controlled yield measurement systems during the harvest of seed potatoes. Continuous images are taken on the conveyor of the harvester to determine the size volume of every single potato. Autonomous moving vehicles with multiple layers of stereo-vision cameras that automatically count and classify tomatoes while they are still on the plant are under development. Together with forecasting software this results in valuable information on future crop development and harvest. F-RCNN and YOLO networks are also used to assess the number of flowers and flower buds of gerbera plants for yield prediction and autonomous harvesting. In plant manipulation applications typically 3D information is required from the vision system, often in combination with colour. The use of networks that can directly analyse point clouds, such as PointNet or PointPillars open new possibilities and have recently got a lot of attention.

RecPad 2021

27th edition of the Portuguese Conference On Pattern Recognition

Organizing Committee

• Teresa Gonçalves, Universidade de Évora
• Luís Rato, Universidade de Évora
• Pedro Salgueiro, Universidade de Évora
• Francisco Coelho, Universidade de Évora
• Miguel Barão, Universidade de Évora
• Eduardo Medeiros, Universidade de Évora
• Leonel Corado, Universidade de Évora
• Rute Veladas, Universidade de Évora

Orador convidado

Bio

Multi-objective search with evolving fitness functions for solving scheduling problems

RecPad 2020

26th edition of the Portuguese Conference On Pattern Recognition

Organizing Committee

• Teresa Gonçalves, Universidade de Évora
• Luís Rato, Universidade de Évora
• Pedro Salgueiro, Universidade de Évora
• Miguel Barão, Universidade de Évora
• Eduardo Medeiros, Universidade de Évora

Orador convidado

Bio

Machine Learning for Human Data Modelling and Analysis

RecPad 2019

25th edition of the Portuguese Conference On Pattern Recognition

Orador convidado

Bio

Carmen Poon is currently an Assistant Professor at the Department of Surgery, The Chinese University of Hong Kong (CUHK). She received the B.A.Sc. in Engineering Science, M.A.Sc. in Biomaterials and Biomedical Engineering & Electrical and Computer Engineering at University of Toronto, and Ph.D. in Electronic Engineering at CUHK. Her research interests are in wearable sensing and endoscopic informatics that have potential to change surgical practices. Several pieces of her works have been rated Highly Cited Papers by ISI Web of Science (2015-2018) and collectively, her works have been cited >2300 times in Scopus (as of 25 Dec. 2018).

Carmen is serving as Conference Chair of the 16th International Conference on Wearable and Implantable Body Sensor Networks, which will be held in Chicago, USA, 2019. She has served as IEEE Engineering in Medicine and Biology Society (EMBS) Administrative Committee member (2014-2016), and Chair for EMBS Technical Committee on Wearable Biomedical Sensors and Systems (2016-2017). She was Managing Editor for IEEE JOURNAL OF BIOMEDICAL AND HEALTH INFORMATICS (2009-2016), during which the Journal’s impact factor has doubled from 1.6 to 3.4. She now serves on the Editorial Boards for several international peer-reviewed journals published by IEEE, IOP, Elsevier and ACM.

Carmen is a Senior Member of IEEE. She received the IFMBE/IAMBE Early Career Award awarded by International Federation of Medical and Biological Engineering / The International Academy of Medical and Biological Engineering in 2015, and the IEEE-EMBS Academic Early Career Achievement Award “for contributions to wearable sensing and endoscopic surgery” in 2018.

Título

AI-doscopist: A Deep Learning-based Model for Real-time Cancer Diagnosis during Therapeutic Endoscopy.

RecPad 2018

24th edition of the Portuguese Conference On Pattern Recognition

Organizing Committee

• Bernardete Ribeiro
• Hélder Araújo
• Catarina Silva
• César Teixeira
• Joel Arrais
• Joana Costa
• Francisco Antunes

Orador convidado

Bio

Vincenzo Piuri has received his Ph.D. in computer engineering at Politecnico di Milano, Italy (1989). He is Full Professor in computer engineering at the Università degli Studi di Milano, Italy (since 2000). He has been Associate Professor at Politecnico di Milano, Italy and Visiting Professor at the University of Texas at Austin and at George Mason University, USA.

His main research interests are: intelligent systems, signal and image processing, machine learning, pattern analysis and recognition, theory and industrial applications of neural networks, biometrics, intelligent measurement systems, industrial applications, fault tolerance, digital processing architectures, and cloud computing infrastructures. Original results have been published in more than 400 papers in international journals, proceedings of international conferences, books, and book chapters.

He is Fellow of the IEEE, Distinguished Scientist of ACM, and Senior Member of INNS. He has been IEEE Vice President for Technical Activities (2015), IEEE Director, President of the IEEE Computational Intelligence Society, Vice President for Education of the IEEE Biometrics Council, Vice President for Publications of the IEEE Instrumentation and Measurement Society and the IEEE Systems Council, and Vice President for Membership of the IEEE Computational Intelligence Society. He is Editor-in-Chief of the IEEE Systems Journal (2013-19), and Associate Editor of the IEEE Transactions on Computers and the IEEE Transactions on Cloud Computing, and has been Associate Editor of the IEEE Transactions on Neural Networks and the IEEE Transactions on Instrumentation and Measurement.

He received the IEEE Instrumentation and Measurement Society Technical Award (2002). He is Honorary Professor at Obuda University, Budapest, Hungary, Guangdong University of Petrochemical Technology, China, Muroran Institute of Technology, Japan, and the Amity University, India.

Computational Intelligence for Biometric Technologies and Applications

RecPad 2017

23rd edition of the Portuguese Conference On Pattern Recognition

Comité organizativo

• Jose Silvestre Serra Silva, Chairman, (Academia Militar);
• Jorge Paulo Alves Torres, (Academia Militar);
• Pedro Nuno Mendonça dos Santos, (Academia Militar);
• Thomas Peter Gasche, (Academia Militar).

Orador convidado

Bio

Paul Scheunders received the Ph.D. degree in physics, with work in the field of statistical mechanics, from the University of Antwerp, Antwerp, Belgium, in 1990. In 1992, he became a research associate with the Vision Lab, Department of Physics, University of Antwerp, where he is currently a professor. His current research interest includes remote sensing and in particular hyperspectral image processing. He has published over 150 papers in international journals and proceedings in the field of image processing, pattern recognition and remote sensing.

Paul Scheunders is associate editor of the IEEE Transactions in Geoscience and Remote Sensing, and has served as program committee member in numerous international conferences. He is senior member of the IEEE Geoscience and Remote Sensing Society.

Machine Learning for remote sensing image analysis

In this talk, he will describe the state of the art on the development and application of machine learning methodologies in the remote sensing domain. He will also describe the specific remote sensing analysis problems that are typically handled by machine learning. On important type of sensor is the hyperspectral image sensor. Hyperspectral image sensors have been important tools for the characterization of materials based on their light reflectance mainly in remote sensing but in other domains as well. Hyperspectral images contain many spectral bands, each revealing the earth surface reflected light at a particular wavelength. These hyperspectral images require specific image processing and analysis methodologies. In this talk, an overview will be given of recent developments of machine learning in hyperspectral image analysis. Some of the strategies that are elaborated on are kernel methods, neural network methods, manifold learning methods, structured output methods, ensemble learning methods and sparse learning methods.

RecPad 2016

22nd edition of the Portuguese Conference On Pattern Recognition

Comité organizativo

• Armando J. Pinho (UA)
• Diogo Pratas (UA)
• Raquel Sebastião (UA)
• Samuel Silva (UA)
• Sónia Gouveia (UA)
• Susana Brás (UA)

Orador convidado

Bio

Joan Serra-Sagristà (IEEE Senior Member 2011) received the Ph.D. degree in computer science from Universitat Autònoma de Barcelona (UAB), Spain, in 1999. He is currently an Associate Professor at Department of Information and Communications Engineering, UAB. He holds the Accreditation as Full Professor from both Spanish ANECA and Catalan AQU Catalunya. From September 1997 to December 1998, he was at University of Bonn, Germany, funded by DAAD. His current research interests focus on data compression, with special attention to image coding for remote sensing and telemedicine applications. He serves as Associate Editor of IEEE Trans. on Image Processing and as Program Committee co-chair for IEEE Data Compression Conference. He has co-authored over one hundred publications. He was the recipient of the Spanish Intensification Young Investigator Award in 2006.

RecPad 2015

21st edition of the Portuguese Conference On Pattern Recognition

Comité organizativo

• João Rodrigues – General Chair (UAlg)
• Pedro Cardoso – (UAlg)
• Robert Lam – (UAlg)
• Mauro Figueiredo – (UAlg)

Patrocinadores

Orador convidado

Norbert Krüger

Maersk MC-Kinney Moller Institute for Production Technology,

Technical Faculty at the University of Southern Denmark.

Denmark

Bio

Norbert Krüger has been employed at the University of Southern Denmark since 2006 (first as an Associate Professor and then as a full Professor (MSO) since 2008). He is one of the two leaders of the Cognitive and Applied Robotics Group (CARO, caro.sdu.dk) in which currently 12 PhD students, two Assistant and two Associate Professor as well as 8 master students are working. Norbert Krüger’s research focuses on Cognitive Vision, in particular vision based manipulation and learning. He has published 45 papers in journals and more than 80 papers at conferences covering the topics computer vision, robotics, neuroscience as well as cognitive systems. His H-index is 24. His group has developed the C++-software CoViS (Cognitive Vision Software) which is now used by a number of groups in national as well as European projects. He is currently involved in 2 European projects as well as 4 Danish projects.

Deep Hierarchies in Human and Computer Vision

Computer vision – although being still a rather young scientific discipline – in the last decades was able to provide some impressive examples of artificial vision systems that outperform humans. However, the human visual system is still superior to any artificial vision system in visual tasks requiring generalization and reasoning (often also called ‘cognitive vision’) such as extraction of visual based affordances or visual tasks in the context of tool use and dexterous manipulation of unknown objects.

Two decades ago, there has been a strong connection between the two communities dealing with human vision research and computer vision. This link however has been somehow lost recently and computer vision has been more and more developed into a sub-field of machine learning. In this talk, I argue that the reason for the superiority of human vision for ‘cognitive vision tasks’ is connected to the deep hierarchical architecture of the primate’s visual system.

The talk is divided into two parts: First, I will give an overview about today’s knowledge about the primate’s (and by that the human’s) visual system primarily based on neurophysiological research. This part is based on the paper (Kruger et al. 2013, IEEE PAMI) and is in particular addressing computer vision and machine learning scientists as audience.

In the second part of the talk, I will describe a three level hierarchical cognitive robot system in which actions are learned by observing humans performing these actions (Kruger et al. 2013, KI). Learning is taking place at the different levels of the hierarchy in rather different representations. On the sensory-motor level, the shape and appearance of objects as well as optimal action trajectories and force torque profiles are represented. On the mid-level, a discrete visual representation based on semantic event chains (Aksoy et al. 2011) bridges towards the planning level, the highest representational level. I will describe different the learning problems on the different representational levels and their interaction.

RecPad 2014

20th edition of the Portuguese Conference on Pattern Recognition.

Comité organizativo

• Luís A. Alexandre – General Chair (UBI)
• Hugo Proença – (UBI)
• Paulo Fazendeiro – (UBI)
• Dulce Ribeiro – Secretary (UBI)

Patrocinadores

Orador convidado

Associate Researcher
Institut de Robòtica i Informàtica Industrial (CSIC-UPC)
Barcelona, Spain

Bio

Francesc Moreno-Noguer received the MSc degrees in industrial engineering and electronics from the Technical University of Catalonia (UPC) and the Universitat de Barcelona in 2001 and 2002, respectively, and the PhD degree from UPC in 2005. From 2006 to 2008, he was a postdoctoral fellow at the computer vision departments of Columbia University and the Ecole Polytecnique Fédérale de Lausanne. In 2009, he joined the Institut de Robòtica i Informàtica Industrial in Barcelona as an associate researcher of the Spanish Scientific Research Council. His research interests include retrieving rigid and nonrigid shape, motion, and camera pose from single images and video sequences, with applications to both robotics and medical imaging. He received UPC’s Doctoral Dissertation Extraordinary Award for his work and an outstanding reviewer award at ECCV’12 and CVPR’14. Further information can be found at https://www.iri.upc.edu/people/fmoreno/.

Monocular 3D detection of rigid and non-rigid shapes

In this talk, I will first present an approach to the PnP problem, the estimation of the pose of a calibrated camera from n point correspondences between an image and a 3D model of a rigid object, whose computational complexity grows linearly with n. Our central idea is to express the 3D points as a weighted sum of four virtual control points. The problem then reduces to estimating the coordinates of these control points in the camera coordinate system, which can be done in O(n) using simple linearization techniques. I will then show how an algebraic outlier rejection scheme can be introduced within the computation of the pose, without the need to resort to RANSAC-based strategies.

In the second part of the talk I will show how the same linear formulations can be extended to retrieving the shape of 3D deformable objects. However, since monocular non-rigid reconstruction is severely under-constrained we will have to consider additional constraints, either based on local rigidity (to reconstruct deformable and inextensible surfaces), or based on shading coherence (to reconstruct deformable and stretchable surfaces). Finally I will discuss the major limitations of these linear formulations and propose a novel and alternative stochastic exploration strategy. I will present results both for non-rigid shape and human pose recovery.

RecPad 2013

19th edition of the Portuguese Conference on Pattern Recognition.

• João Sanches – General chair (ISR / IST)
• Manya Afonso – Local chair (ISR / IST)
• David Afonso – Informatics (ISR / IST)
• Alexandre Domingues (ISR / IST)
• Martina Fonseca (ISR / IST)
• Anastasiya Strembitska (ISR / IST)

Orador convidado

Bio

Ana L.N. Fred received the MS and PhD degrees in electrical and computer engineering, in 1989 and 1994, respectively, both from the Instituto Superior Técnico (IST), Technical University of Lisbon, Portugal.

She has been a faculty member of IST since 1986, where she is currently a professor (Professora associada com agregação) with the Department of Electrical and Computer Engineering.

She is a researcher at the Communication Theory and Pattern Recognition Group of the Institute of Telecommunications. Her research interests include information theory, pattern recognition, signal processing, and artificial intelligence.

Título:

PHYSIOLOGICAL COMPUTING – A PATTERN RECOGNITION PERSPECTIVE

RecPad 2012

18th edition of the Portuguese Conference on Pattern Recognition.

RecPad was organized by:

Organizing Committee

• Nuno Cid Martins
• Verónica Vasconcelos
• Fernando Lopes
• Inácio Fonseca
• Jorge Barbosa
• Nuno Rodrigues
• Simão Paredes

Orador convidado

Bio

Carlos Gonzalez-Morcillo is an Associate Professor of Computer Science at the University of Castilla-La Mancha (Spain). He received the BsC and PhD degrees in Computer Science from the University of Castilla-La Mancha in 2002 and 2007, respectively. His research interests include Distributed Rendering, Augmented Reality, MultiAgent Systems, and Intelligent Surveillance. Dr Morcillo has worked in the fields of Computer Vision and Data Mining at the Software Competence Center Hagenberg (Austria). He is Blender Foundation Certified Trainer and member of the Eurographics Society. He is also co-author of the Spanish book Fundamentals of 3D Image Synthesis, a practical approach with Blender. Further information can be found at https://www.esi.uclm.es/www/cglez

Indoor Navigation Infrastructure based on Augmented Reality Techniques

Indoor navigation systems have represented a hot research topic for the research community with many different proposals to position people and keep track of their movements. In this lecture, Dr. Morcillo will take a step forward describing an object-oriented distributed architecture for highly scalable indoor navigation systems. The idea behind this architecture is to assist people with different needs while they stay in large spaces or buildings, such as public administration buildings, transport facilities, hospitals and so on, helping them reach their goals in such environments.

In this context, the use of Augmented Reality techniques boosts the concept of mobility thanks to the underlying architecture, integrating heterogeneous hardware devices and tracking methods. The resulting platform is a multi-layered scalable architecture based on autonomous agents. The most relevant work carried out by the Applied Artificial Intelligence Research Group at the University of Castilla-La Mancha will be also discussed.

RecPad 2011

17th edition of the Portuguese Conference on Pattern Recognition

• Pedro Quelhas (FEUP / INEB)
• Luís F. Teixeira (FEUP)
• Jaime S. Cardoso (FEUP / INESC Porto)

• Ricardo Sousa (FEUP / INESC Porto)

Orador convidado

Bio

Daniel Gatica-Perez is a senior researcher at Idiap Research Institute and the Swiss Federal Institute of Technology in Lausanne (EPFL), Switzerland, where he directs the Social Computing Group. His research integrates methods from multimedia signal processing, machine learning, ubiquitous computing, and social sciences to develop computational models for human and social behavior analysis from sensor data. His recent work has studied small groups at work in multisensor spaces, populations of smartphone users in urban environments, and on-line communities in social media. His work
has been supported by the Swiss and US governments, the European Union, and industry. Among several professional activities, he currently serves as Associate Editor of the IEEE Transactions on Multimedia, Image and Vision Computing, and the Journal of Ambient Intelligence and Smart Environments.

Reality Mining for Real: Large-Scale Human Behavior and Smartphone Data

The large-scale understanding of personal and social behavior from smartphone sensor data is an emerging trend in computing. Smartphones can constantly sense human location, motion, proximity, and communication, and represent one of the most accurate means of tracing human activities. All this data,as never before, is being generated at massive scales.

I will present an overview of recent work in my research group in this domain, which is addressing mobile sensing, data analysis, and applications. I will first describe our experience with the collection of a rich corpus of real life data using smartphones as sensors, and discuss a few of the many associated challenges – both human and technological. I will then present computational methods that we have developed to discover a variety of patterns, including daily routines of individuals, trends of phone application usage, social interaction types, and personality traits. I will finally discuss about open issues in this domain.

RecPad 2010

16th Portuguese Conference on Pattern Recognition

• Paulo Salgado
• João A. Pavão
• Pedro Couto

Orador convidado

< Inserir foto com CCS class de “conference-guest-img” >

Bio

Jesús Chamorro Martinez – jesus@decsai.ugr.es  | Associate professor

Department of Computer Science and Artificial Intelligence – University of Granada

Jesús Chamorro was born in 1972. He received the MS and PhD degrees, both in Computer Science, from the University of Granada in 1995 and 2001 respectively. Since 1996, he is member of the Computer Science Department at the University of Granada where he is now an Associate Professor. His research interests include motion analysis and optical flow estimation, information retrieval from image databases, soft computing image processing, and biomedical image analysis. He has participated in several projects from the Spanish Research Council (CICYT) and currently he is participating in the Spanish FIS project “Imagen Médica Molecular y Multimodalidad” (IM3).

Multiple Motion Segmentation based on Spatio-temporal Volume Recognition. Application to Optical flow estimation

In this lecture, a new methodology for extracting motion patterns is applied to optical flow estimation in the presence of multiple motions. The proposed approximation deals with the problem in two stages. In the first one, the most important motions are segmented; in the second one, the optical flow is estimated on the basis of the motions detected in the previous stage. To extract relevant motions, a new approach based on a spatio-temporal filtering is presented. The approach groups together parts of a moving object that have been separated into various filter responses because of the object’s spatial structure, thereby avoiding the spatial dependency problem associated with a representation based on spatio-temporal filters. The proposed model, therefore, generates one “motion pattern” for each motion detected in the sequence. To obtain an optical flow estimation, which is able to represent multiple velocities, the gradient constraint is applied to the output of each filter so that multiple estimations of the velocity at the same location may be obtained. For each “motion pattern” detected in the previous stage, the velocities at a given point corresponding to the same motion are then combined using a probabilistic approach. In the application to optical flow estimation, the use of “motion patterns” allows multiple velocities to be represented, while the combination of estimations fromdifferent filters helps reduce the aperture problem. This technique is illustrated on real and simulated data sets, including sequences with occlusion and transparencies.

RecPad 2009

15th Portuguese Conference on Pattern Recognition

Orador convidado

RecPad 2007

13ª Conferência Portuguesa de Reconhecimento de Padrões

• Pedro Pina (Chair, IST)
• José Saraiva (IST)
• Cristina Lira (IST)
• Michele Mengucci (IST)
• Nuno Benavente (IST)
• Lourenço Bandeira (IST)

• Aurélio Campilho (INEB/FEUP)
• Beatriz Sousa Santos (Univ. Aveiro)
• Helder Araújo (Univ. Coimbra)
• João Rogério Caldas Pinto (IST)
• Pedro Pina (IST)

Orador convidado

Júlio Martín-Herrero, Professor da Escuela Técnica Superior de Ingenieros de Telecomunicación da Universidade de Vigo em Espanha, que tem como principais interesses de investigação o Processamento de Imagem e Visão Artificial, a Análise Espacial e as suas aplicações multidisciplinares. O título da apresentação que irá efectuar é o seguinte:

Robust Oil Slick Identification in Synthetic Aperture Radar Images with Support Vector Machines

RecPad 2008

14ª Conferência Portuguesa de Reconhecimento de Padrões

• Jorge Batista (Chair,ISR/FCTUC)
• Helder Araújo (ISR/FCTUC)
• Paulo Peixoto (ISR/FCTUC)
• Gonçalo Monteiro (ISR)
• Pedro Martins (ISR)

Orador convidado

Dr. Jordi Gonzàlez, Investigador no Institut de Robòtica i Informàtica Industrial (UPC-CSIC), Espanha.

Dr. Jordi Gonzàlez obtained his PhD degree in 2004, from Universitat Autònoma de Barcelona. At present he is a Juan de la Cierva postdoctoral researcher at the Institut de Robòtica i Informàtica Industrial (UPC-CSIC). The topic of his research is the cognitive evaluation of human behaviours in image sequences. The aim is the generation of both linguistic descriptions and virtual environments, which explain those observed behaviours. He has more than 70 publications about his research on active camera control; segmentation and tracking; human action recognition; human behaviour understanding and interpretation; natural language text generation; and automatic behavioural animation. He has also participated as a WP-leader in the European projects HERMES and VIDI-Video, and as a member in the euCognition network. He co-founded the Image Sequence Evaluation research group at the CVC in Barcelona.

Towards Human Sequence Evaluation

RecPad 2002

12th Portuguese Conference on Pattern Recognition

Orador convidado

3D texture analysis for medical applications
Maria Petrou
School of Electronics, Computing and Mathematics, University of Surrey, Guildford, U. K.
ABSTRACT — Volume data are very common in Medicine. However, they are difficult to visualise, yet alone to assess properties like volumetric isotropy or variation. Currently clinicians see such data slice by slice, they do not and they cannot take advantage of the full information conveyed by such data. This talk will present a way of assessing the texture of 3D volume data, a way of visualising such information, and some applications of the approach to schizophrenia and Alzheimer’s desease.

Information Theoretic Learning: A Nonparametric Approach
José C. Principe
Computational NeuroEngineering Laboratory, University of Florida, Gainesville, FL, U.S.A.
ABSTRACT — This talk will present a new cost function for adaptation based on Renyi’s entropy. In order to obtain a practical nonparametric cost function for supervised or unsupervised training of linear or nonlinear mappers, we integrate Renyi’s definition with a Parzen estimator. This estimator of entropy does not require a data model, and resembles an interaction model for learning (the information potential). Properties of the information potential will be presented, and several learning algorithms (batch, stochastic gradient, and a recursive entropy estimator) will be derived. Results in feature extraction, unsupervised clustering, blind source separation and information filtering will be presented.

Handling impulsive noise
Paulo J. S. G. Ferreira
Dep. de Electronica e Telecomunicações, Universidade de Aveiro, Portugal
ABSTRACT —Dealing with impulsive noise remains a challenge, despite the efforts of many people and the existence of several distinct approaches. This talk addresses the issue of impulsive noise removal. A few of the possible approaches will be considered, giving some attention to the two basic frameworks that must be faced when discussing the problem: the analog case, and the digital case. The techniques discussed are nonlinear, and under certain conditions lead to the total removal of the noise. The connections between the techniques discussed and other approaches (including error control coding) are also discussed.

RecPad 2000

11th Portuguese Conference on Pattern Recognition