Publications -2003-     -2002- -2001- -2000- -1999- -1998- -1997- -1996-
 


2007
 

"Low-Cost Method for the Estimation of the Shape of Quadric Mirrors and Calibration of Catadioptric Cameras", N. Gonçalves, H. Araújo. Optical Engineering. Vol 46 (7), p. 1-12. July 2007.

"Retrieving and Exploiting Hand's Orientation in Tabletop Interaction", J. Carreira, P. Peixoto. IEEE International Conference on Multimedia & Expo, July 2007, Beijing, People's Republic of China.

 
2006
 

"Volumetric multi-camera scene acquisition with partially metric calibration for wide-area tele-immersion", X. Zabulis, J. P. Barreto, N. Kelshikar, R. Molana, and K. Daniilidis. Book chapter in Springer Lecture Notes in Computational Science and Engineering. To appear.

"A Dual-Stage Robust Vehicle Detection and Tracking for Real-Time Traffic Monitoring". Jorge Batista, Paulo Peixoto, Catarina Fernandes, Miguel Ribeiro, ITSC 2006 - 9th Int. IEEE Conference on Intelligent Transportation Systems, Toronto, Canada, Sept 17-20, 2006.

"Nuisance Free Recognition of Hand Postures over a Tabletop Display", J. Carreira, P. Peixoto. Published in Conferences in Research and Practice in Information Technology (CRPIT), Vol. 56. HCSNet Workshop on the use of Vision in HCI (VisHCI 2006). November 2006, Canberra, Australia.

"Unraveling Natural Interfaces for Local Collaborative Groupware: Lessons Learned in an Experiment with Music", J. Carreira, P. Peixoto. Journal of Multimedia, August 2006, Academy Publisher.

"Epipolar Geometry of Central Projection Systems using Veronese Maps", J. P. Barreto and K. Daniilidis. IEEE Int. Conf. on Computer Vision and Pattern Recognition. New York, June 2006.

"Unifying Geometric Representation for Central Projection Systems", J. P. Barreto. Computer Vision and Image Understanding. Vol 103 (2006),pp 208-207, September 2006.

"A Vision Based Interface for Local Collaborative Music Synthesis", J. Carreira, P. Peixoto. Proceedings of the IEEE Automatic Face and Gesture Recognition Conference, April 2006, Southampton, UK.

"Fitting Conics to Paracatadioptric Projection of Lines", J. P. Barreto and H. Araújo. Computer Vision and Image Understanding, 101(3), pp. 151165, March 2006.

 
2005

 

"A Natural Hand Gesture Human Computer Interface Using Contour Signatures", P. Peixoto, J. Carreira. Proceedings of the Iasted HCI Conference, November 2005, Phoenix, USA.

"Fundamental Matrix for Cameras with Radial Distortion", J. P. Barreto and K. Daniilidis. IEEE Int. Conf. on Computer Vision. Beijing, October 2005.

"A Real-Time Driver Visual Attention Monitoring System", Jorge Batista, in Jorge S. Marques, Nicolas Perez de la Blanca and Pedro Pina (Eds.), IbPRIA 2005 - Pattern Recognition and Image Analysis (Lecture Notes on Computer Science) Springer-Verlag, London, pp.200-208, 2005.

"Partial Calibration and Mirror Shape Recovery for Non-central Catadioptric Systems", N. Gonçalves, H. Araújo. OMNIVIS'05 - The 6th Workshop on Omnidirectional Vision, Camera Networks and Non-Classical Cameras, joint with ICCV 2005. Beijing, China, October 2005.

"Estimating Parameters of Non-Central Catadioptric Systems Using Bundle Adjustment.", N. Gonçalves, H. Araújo. OMNIVIS'05 - The 6th Workshop on Omnidirectional Vision, Camera Networks and Non-Classical Cameras, joint with ICCV 2005. Beijing, China, October 2005.

"A New Stereovision Method for Obstacle Detection and Tracking in Non-flat Urban Environments", Qian Yu, H. Araújo, H. Wang, Autonomous Robots, Vol 19, No. 2, pp. 141-157, September 2005.

"Geometric Properties of Central Catadioptric Line Images and their Application in Calibration", J. P. Barreto, H. Araújo, PAMI-IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol. 27, No. 8, pp. 1327-1333, August 2005.

"Calibration Algorithms for the X-Slits Cameras", N. Martins, H. Araújo, IBPRIA 2005-2nd Iberian Conference on Pattern Recognition and Image Analysis, June 7-9, 2005, Estoril, Portugal.

"Unifying Image Plane Liftings for Central Catadioptric and Dioptric Cameras", Joao P. Barreto. Book chapter in Imaging Beyond the Pin-hole. K Daniilidis and A. Leonardis (Ed.). Kluwer Academic Publisher, 2005.

 
2004
 

"Projection Model, 3D Reconstruction and Rigid Motion Estimation from Non-central Catadioptric Images", 2nd International Symposium on 3D Data Processing, Visualization and Transmission, N. Gonçalves, H. Araújo, Thessaloniki, Greece, September 2004.

"Rigid Motion Estimation from Non-central Catadioptric Images", ICPR 2004-Int. Conf. on Pattern Recognition, Nuno Gonçalves, H. Araújo, Cambridge, UK, August, 2004.

"Unifying Image Plane Liftings for Central Catadioptric and Dioptric Cameras", J. P. Barreto and K. Daniilidis. Int. Work. on Omnidirectional Vision, Camera Networks and Non-Classical Cameras. Prague, May 2004.

"Wide Area Multiple Camera Calibration and Estimation of Radial Distortion", J. P. Barreto and K. Daniilidis. Int. Work. on Omnidirectional Vision, Camera Networks and Non-Classical Cameras. Prague, May 2004.

"Tracking Pedestrians in a Multiple Cameras System with Trajectory Prediction and Occlusion Modelling ", Jorge Batista, PETS/ECCV 2004 - Sixth IEEE Int. Workshop on Performance Evaluation of Tracking and Surveillance, Prague, Czech Republic, May 10, 2004.

"Tracking Pedestrians under Occlusion using Multiple Cameras ", Jorge Batista, in M. Camel and A. Campilho (Eds.) , ICIAR 2004 - Image Analysis and Recognition (Lecture Notes on Computer Science) Springer-Verlag, London, pp.552-562, 2004.

"A General Framework for the Selection of World Coordinate Systems in Perspective and Catadioptric Imaging Applications", J. P. Barreto, H. Araújo, International Journal of Computer Vision, Vol. 57, No. 1, pp. 23-47, April 2004.

 
2003
 

"Analysis and Comparison of Two Methods for the Estimation of 3D Motion Parameters", N. Gonçalves, H. Araújo, accepted for publication in Robotics and Autonomous Systems.

"A Review on Egomotion by Means of Differential Epipolar Geometry Applied to the Movement of a Mobile Robot", X. Armangué, H. Araújo, J. Salvi, accepted for publication in Pattern Recognition.

"Mirror Shape Recovery From Image Curves and Intrinsic Parameters: Rotationally Symmetric and Conic Mirrors", N. Gonçalves, H. Araujo, accepted in OMNIVIS'03—Omnidirectional Vision and Cameras Networks, workshop at CVPR'03.

"Direct Least Square Fitting of Paracatadioptric Line Images", J. P. Barreto, H. Araujo, accepted in OMNIVIS'03—Omnidirectional Vision and Cameras Networks, workshop at CVPR'03.

"Stereo-Vision Based Real Time Obstacle Detection for Urban Environments", Qian Yu, H. Araujo, Hong Wang, ICAR'2003—11th Int. Conf. on Advanced Robotics, June-July 2003, Coimbra, Portugal.

"Paracatadioptric Camera Calibration Using Lines", J. P. Barreto, H. Araujo, ICCV'2003—Int. Conf. on Computer Vision, October 2003, Nice, France.

"Visual Servoing/Tracking Using Central Catadioptric Images", J. P. Barreto, F. Martin and R. Horaud. Experimental Robotics VIII. B. Siciliano and P.Dario (Ed). Springer Verlag, 2003

 
2002
 

"Estimation of 3D Motion from Stereo Images-Uncertainty Analysis and Experimental Results", Nuno Gon�lves, H. Araújo, IROS’2002—IEEE/RSJ International Conference on Intelligent Robots and Systems, Lausanne, Switzerland, September 30—October 4, 2002

"Pose Estimation for Central Catadioptric Systems: an Analytical Approach", Antonio Paulino, H. Araújo, ICPR'2002—16th International Conference on Pattern Recognition , Quebec City, Canada, August 11-15, 2002

"Differential Epipolar Constraint in Mobile Robot Egomotion Estimation", X. Armangu� H. Arajo, J. Salvi, ICPR'2002--16th International Conference on Pattern Recognition , Quebec City, Canada, August 11-15, 2002

"Real-Time Gesture Recognition System Based on Contour Signatures", P. Peixoto, J. Gon�lves, H. Araújo, ICPR'2002 --16th International Conference on Pattern Recognition, Quebec City, Canada, August 11-15, 2002

"Estimation of 3D Motion from Stereo Images - Differential and Discrete Formulations", N. Gon�lves, H. Araújo, ICPR'2002--16th International Conference on Pattern Recognition, Quebec City, Canada, August 11-15, 2002

"Uncertainty Propagation in the Estimation of Partial 3D Velocity", N. Gon�lves, H. Araújo, MED'2002--10th Mediterranean Conference on Control and Automation, Lisbon, Portugal, July 2002

"Geometric Properties in Central Catadioptric Line Images", Jo� P. Barreto, H. Araújo, ECCV20027th European Conference on Computer Vision , Copenhagen, Denmark, May 28--31, 2002

 
2001
 

"Issues on the Geometry of Central Catadioptric Image Formation", J. P. Barreto and H. Araújo, CVPR2001--Proc. of IEEE Int. Conf. On Computer Vision and Pattern Recognition , Hawaii, USA, December 2001

"Real-Time Human Activity Monitoring Exploring Multiple Vision Sensors", P. Peixoto, J. Batista, H. Araújo, Robotics and Autonomous Systems , vol. 35, pp. 221--228, 2001

"Maintaining the Relative Positions and Orientations of Multiple Robots Using Vision", A. Paulino, J. Batista, H. Araújo, Pattern Recognition Letters, Vol. 22, No. 12, pp. 1331-1335, October 2001

"Comparison of Control Structures for Visual Servoing", S. Chroust, M. Vincze, J.P. Barreto, H. Araújo, ICAR'2001--10th International Conference on Advanced Robotics, Budapest, Hungary, August 22-25, 2001

"Analysis of two methods for the estimation of partial 3D velocity", SIRS2001--Proceedings of the 9th International Symposium on Intelligent Robotic Systems, Nuno Gon�lves, Helder Arajo, Toulouse, France, 18-20 July 2001

"Control Aspects of Maintaining Non-Holonomic Robots in Geometric Formation", Ant�io Paulino, H. Araújo, SIRS2001--Proceedings of the 9th International Symposium on Intelligent Robotic Systems, pp. 18-20, Toulouse, France, July, 2001

 
2000
 

"Model Predictive Control to Improve Visual Control of Motion: Applications in Active Tracking of Moving Targets", Jo� P. Barreto, Jorge Batista, Helder Arajo, ICPR00 15th Int. Conference on Pattern Recognition, Barcelona, Spain, September 3-8, 2000

"Controlling Multiple Robots in Geometric Formation Using Vision", Ant�io Paulino, Jorge Batista, Helder Arajo,in Mechatronics and Machine Vision, John Billingsley (Ed.), Research Studies Press, Hertfordshire, UK, pp. 57-64, 2000

"Binocular Tracking and Accomodation controlled by Retinal Motion Flow", Jorge Batista, Paulo Peixoto, Helder Arajo, ICPR00 15th Int. Conference on Pattern Recognition , Barcelona, Spain, September 3-8, 2000

"A Surveillance System Integrating Visual Telepresence", Paulo Peixoto, Jo� Gon�lves, Hugo Antunes, Jorge Batista, Helder Arajo, ICPR00 15th Int. Conference on Pattern Recognition, Barcelona, Spain, September 3-8, 2000

Mathematical Analysis for Visual Tracking Assuming Perspective Projection, J. P. Barreto, J. Batista, H. Arajo, SIRS'20008th International Symposium on Intelligent Robotic Systems, pp. 319328, University of Reading, U.K., July 18-20, 2000

"Multiple Robots in Geometric Formation: Control Structure and Sensing", A. Paulino, J. Batista, H. Arajo, SIRS'20008th International Symposium on Intelligent Robotic Systems, pp. 103112, University of Reading, U.K., July 18-20, 2000

J. P. Barreto, J. Batista, H. Araujo, "Solutions for Visual Control of Motion: Active Tracking Applications",8th IEEE Mediterranean Conference on Control and Automation, University of Patras, Greece, July 1719, 2000

"Integration of Information from Several Vision Sensors for a Common Task of Surveillance", P. Peixoto, J. Batista, H. Arajo, Robotics and Autonomous Systems, vol. 31,(2000)

"Evaluation of the Robustness of Visual Behaviors through Performance Characterization", J. P. Barreto, P. Peixoto, J. Batista, H. Arajo, in Markus Vincze and Gregory Hager (Eds) Robust Vision for Vision-Based Control of Motion, IEEE Press, 2000

"Combination of Several Vision Sensors for Interpretation of Human Actions", Paulo Peixoto, Jorge Batista, Helder Arajo, A. T. de Almeida, In P. Corke and J. Trevelyan (Eds.) Experimental Robotics VI London,2000

"Visual Telepresence for Surveillance Purposes", Paulo Peixoto, Jo� Gon�lves, Hugo Antunes, Jorge Batista and Helder Arajo, ISR200031st International Symposium on Robotics, Montreal, Canada, May 14-17, 2000

"A Focusing-by-Vergence System Controlled by Retinal Motion Disparity", Jorge Batista, Paulo Peixoto and Helder Arajo, ICRA2000IEEE International Conference on Robotics and Automation, San Francisco, California, USA, April 2000

"Control Issues to Improve Visual Control of Motion: Applications in Active Tracking of Moving Objects", J.P. Barreto, J. Batista, H. Arajo, A. T. Almeida, AMC'20006th International Workshop on Advanced Motion Control, Nagoya, Japan, March 30April 1, 2000

 
1999
 

"Tracking Multiple Objects in 3D", J. P. Barreto, P. Peixoto, J. Batista, H. Arajo, IROS'99-IEEE/RSJ International Conference on Intelligent Robots and Systems, Kyongju, Coreia, 17-21 Outubro, 1999

"Iterative Multi-Step Explicit Camera Calibration", J. Batista, H. Arajo, A. Almeida, IEEE Transactions on Robotics and Automation, Vol. 15, No. 5, October 1999, pp. 897917.

"An Automatic Optical Sensor for Vessels and Fibbers Quality Inspection in Pulp Production", P. Carvalho, H. Arajo, A. Dourado, Computers and Industrial Engineering, Vol. 37, nos 1-2, pp. 355-358, October 1999, Elsevier Science.

"An Automatic System for Dirt in Pulp Inspection Using Hierarchical Image Segmentation", F. Duarte, H. Arajo, A. Dourado, Computers and Industrial Engineering, Vol. 37, nos 1-2, pp. 343-346, October 1999, Elsevier Science.

"Real-Time Human Activity Monitoring Exploring Multiple Vision Sensors", P. Peixoto, J. Batista, H. Arajo, SIRS'99-7th International Sympo-sium on Intelligent Robotic Systems, Coimbra, Portugal, 20-23 July, 1999

"A Focusing-by-Vergence System controlled by Retinal Motion Disparity", J. Batista, P. Peixoto, J. P. Barreto, H. Arajo, SIRS'99-7th International Symposium on Intelligent Robotic Systems, Coimbra, Portugal, 20-23 Juy, 1999

"Combination of several vision sensors for Interpretation of Human Actions", P. Peixoto, J. Batista, H. Araujo, A. Almeida, ISER'99--Proceedings of the 6th International Symposium on Experimental Robotics, pp. 462-469, Sydney, Australia, March 26-28, 1999

"Improving 3D Active Visual Tracking", J. P. Barreto, P. Peixoto, J. Batista, H. Araujo, ICVS'99 --Proceedings of the 1st International Conference on Computer Vision Systems, pp. 412-431, Las Palmas, January 13-15, 1999

 
1998
 

"Control Performance Issues in a Bin-ocular Active Vision System", J. P. Barreto, P. Peixoto, J. Batista, H. Araujo, IROS'98--IEEE/RSJ International Conference on Intelligent Robots and Systems, Vol.2, pp. 886-891,Victoria, Canada, October 13-17, 1998.

"Performance Characterization of Visual Behaviors in an Active Vision System", J.P.Barreto, P.Peixoto, J.Batista, H.Arajo, SIRS'98-6th Symposium on Intelligent Robotics Systems , Edinburgh, Scotland, July 21-23, 1998, pp. 309-318.

"Integration of Information from Several Vision Systems for a Common Task of Surveillance", P. Peixoto, J. Batista, H. Arajo, SIRS'98-6th Symposium on Intelligent Robotics Systems , Edinburgh, Scotland, July 21-23, 1998, pp. 301-308.

"Evaluation of the Robustness of Visual Behaviors through Performance Characterization", J. Barreto, P. Peixoto, J. Batista, H. Araujo, IEEE Workshop on Robust Vision for Vision-Based Control of Motion, May 16-20, 1998, Leuven, Belgium.

"A Surveillance System Combining Peripheral and Foveated Motion Tracking", P. Peixoto, J. Batista, H. Arajo, ICPR'98-14th International Conference on Pattern Recognition, Brisbane, Australia, August 16-20, 1998, pp. 574-577.

"A Fully Projective Formulation for Lowes Tracking Algorithm", H Arajo, R. L. Carceroni, C. M. Brown, Computer Vision and Image Understanding, Vol. 70, No. 2, May, pp. 227-238, (1998).

"Simulating Pursuit with Machines--Experiments with Robots and Artificial Vision, J. Dias, C. Paredes, I. Fonseca, J. Batista, H. Arajo, A. T. Almeida, IEEE Transactions on Robotics and Automation, Vol. 14, No. 1, February (1998).

"Active Vision for Autonomous Systems, H. Arajo, J. Dias, J. Batista, P. Peixoto, in A.T. de Almeida and O. Khatib (Eds) Autonomous Robotics Systems, Springer-Verlag, London, pp. 20-49, February, 1998.

"Real-Time Active Active Visual Surveillance by Integrating Peripheral Motion Detection with Foveated Tracking", J. Batista, P. Peixoto, H. Arajo,, Proc. of the IEEE Workshop on Visual Surveillance, pp. 18-25, January 2, 1998, Bombay, India

"Iterative Multi-Step Explicit Camera Calibration", J. Batista, H. Araujo, A. Almeida, ICCV98--5th International Conference on Computer Vision, pp. 709-714, January 4-7, 1998, Bombay, India

 
1997
 

"Real-Time Vergence and Binocular Gaze Control", J. Batista, P. Peixoto, H. Araujo, IROS'97 - IEEE/RSJ International Conference on Intelligent Robots and Systems, Grenoble, France, September 7-11, 1997 (download)

"A Tracking System Integrating Dynamic Accomodation", J. Batista, P. Peixoto, H. Araujo, SIRS'97--5th International Symposium on Intelligent Robotic Systems, pp. 285-294, Stockholm, Sweden, July 8-11, 1997.

"Visual Behaviors for Real-Time Control of a Binocular Active Vision System", J. Batista, P. Peixoto, H. Arajo, IFAC Journal on Control Engineering Practice, Vol. 5, No. 10, pp. 1451-1461, (1997) (download)

"Optical Normal Flow Estimation on Log-Polar Images. A Solution for Real-Time Binocular Vision, J. Dias, H. Arajo, C. Paredes, J. Batista, Journal of Real-Time Imaging, Vol. 3, pp. 213228, (1997)

"Real-Time Visual Behaviors with a Binocular Active Vision System", Jorge Batista, Paulo Peixoto, Helder Araujo, ICRA'971997 IEEE International Conference on Robotics and Automation , Albuquerque, New Mexico, USA, April 20-25, 1997, pp. 3391-3396 (download)

"Visual Behaviors for Real-Time Control of a Binocular Active Vision System, Jorge Batista, Paulo Peixoto, Helder Araujo, Proceedings of the 4th IFAC Workshop on Algorithms and Architectures for Real-Time Control, Vilamoura, Portugal, April 9-11, 1997, pp. 167-172, Pergamon Press

 
1996
 

"Real-Time Visual Behaviors with a Binocular Active Vision System", J. Batista, P. Peixoto, H. Arajo, MFI'96-IEEE/RSJ International Conference on Multi-Fusion & Integration for Intelligent Systems, Washington D.C., December, 1996, pp. 663-670. (download)

"A Control Architecture for Active Vision Systems Enabling Real Time Operation", H. Arajo, J. Dias, J. Batista, P. Peixoto, Proc. of the II Workshop on Cybernetic Vision, Institute of Physics of Sao Carlos, University of Sao Paulo, December 9-11, 1996, Brazil, pp. 3-8, IEEE Computer Society Press (download)

"An Introduction to Log-Polar Mapping", H. Arajo, J. Dias, Proc. of the II Workshop on Cybernetic Vision, Institute of Physics of Sao Carlos, University of Sao Paulo, December 9-11, 1996, Brazil, pp. 139-146, IEEE Computer Society Press.

"Active Vision Architectures for Autonomous Systems", J. Dias, H. Arajo, J. Batista, P. Peixoto, VICAM'96 - Euroconference Workshop on Vision for Control Aspects of Mechatronics, September 16-21, 1996, Guimar�s, Portugal.

"Pose View Stability Analysis for Camera Look Angles Computation", J. Batista, H. Arajo, A.T de Almeida, 13th Int. Conference on Pattern Recognition (ICPR'96), Vienna, Austria, August 25-29, 1996, pp.171-175. (download)

"Pursuit Control in a Binocular Active Vision System Using Optical Flow", H. Araujo, J. Batista, P. Peixoto, J. Dias, 13th Int. Conference on Pattern Recognition (ICPR'96), Vienna, Austria, August 25-29, 1996, pp.313-317. (download)

"Gaze Control of a Binocular Active Vision System Using Optical Flow", H. Araujo, J. Batista, P. Peixoto, J. Dias, 4th Int. Symposium on Intelligent Robotic Systems (SIRS'96), Lisbon, Portugal, July 22-26, 1996, pp.181-188 (download)

"Normal Optical Flow Based on Log-Polar Images", I. Fonseca, J. Dias, H. Arajo, 4th International Symposium on Intelligent Robotic Systems (SIRS96) , pp. 277-284, July 22-26, 1996, Lisbon, Portugal