H. Abdi and D. Valentin, Modèles neuronaux, connexionistes et numériques de la reconnaissance des visages, Psychologie Française, vol.39, issue.4, pp.357-392, 1994.

A. Azarbayejani, B. Horowitz, and A. Pentland, Recursive estimation of structure and motion using relative orientation constraints, Proceedings of IEEE Conference on Computer Vision and Pattern Recognition, 1993.
DOI : 10.1109/CVPR.1993.340966

A. Azarbayejani, T. Starner, B. Horowitz, and A. Pentland, Visually controlled graphics, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol.15, issue.6, pp.602-605, 1993.
DOI : 10.1109/34.216730
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.42.1189

A. M. Bagci, R. Ansari, A. Khokhar, and E. Cetin, Eye tracking using Markov models, Proceedings of the 17th International Conference on Pattern Recognition, 2004. ICPR 2004., 2004.
DOI : 10.1109/ICPR.2004.1334654
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.507.4627

A. Baumberg, Hierarchical shape fitting using an iterated linear filter, 1996.

M. Bichsel and A. Pentland, Automatic interpretation of human head movements, 13th International Joint Conference on Artificial Intelligence, Workshop on Looking At People, 1993.

E. Borovikov, Human head pose estimation by facial features location. Scholarly Paper MD, 1998.

T. Brandt, R. Stemmer, and A. Rakotonirainy, Affordable visual driver monitoring system for fatigue and monotony, Proceedings of Systems, Man and Cybernetics, 2004.

X. L. Brolly, C. Stratelos, and J. Mulligan, Model-based head pose estimation for airtraffic controllers. International Consortium for Integrational Programs, 2003.

L. M. Brown and Y. Tian, Comparative study of coarse head pose estimation, Workshop on Motion and Video Computing, 2002. Proceedings., 2002.
DOI : 10.1109/MOTION.2002.1182224

G. L. Calhoun and G. R. Mcmillan, Hands-free input devices for wearable computers, Proceedings Fourth Annual Symposium on Human Interaction with Complex Systems, 1998.
DOI : 10.1109/HUICS.1998.659965

A. Caporossi, D. Hall, P. Reignier, and J. L. Crowley, Robust visual tracking from dynamic control of processing. Performance and Evaluation of Tracking and Surveillance, 2004.

Q. Chen, H. Wu, T. Fukumoto, and M. Yachida, 3d head pose estimation without feature tracking, Proceedings of Third International Conference on Automatic Face and Gesture Recognition, pp.88-93, 1998.

K. N. Choi, M. Carcassoni, and E. R. Hancock, Recovering facial pose with the EM algorithm, Pattern Recognition, vol.35, issue.10, pp.2073-2093, 2002.
DOI : 10.1016/S0031-3203(01)00173-X

C. Collet, Capture et suivi du regard par un systeme de vision, 1999.

A. Colmenarez, R. Lopez, and T. S. Huang, 3d model-based head tracking, Proceedings of the International Society for Optical Engineering 3024 Serie 1, pp.426-434, 1997.

C. Colombo and A. D. Bimbo, Head pose estimation for graphic remapping by visual tracking of eye appearance, Proceedings of AI*IA Workshop, 1998.

J. L. Crowley and O. Riff, Fast Computation of Scale Normalised Gaussian Receptive Fields, International Conference ScaleSpace, Island of Skye, pp.584-598, 2003.
DOI : 10.1007/3-540-44935-3_41

T. Darrell, B. Moghaddam, and A. Pentland, Active face tracking and pose estimation in an interactive room, Proceedings CVPR IEEE Computer Society Conference on Computer Vision and Pattern Recognition, 1996.
DOI : 10.1109/CVPR.1996.517055

T. Darrell, K. Tollmar, F. Bentley, N. Checka, L. Morency et al., Faceresponsive interfaces : From direct manipulation to perceptive presence, International Conference of Ubiquitous Computing, 2002.

T. D. Orazio, M. Leo, G. Cicirelli, and A. Distante, An algorithm for real time eye detection in face images, Proceedings of 17th International Conference on Pattern Recognition, 2004.

F. Dornaika and F. Davoine, Online appearance-based face anf facial feature tracking, Proceedings of 17th International Conference on Pattern Recognition, 2004.
DOI : 10.1109/icpr.2004.1334653

E. Elagin, J. Steffens, and H. Neven, Automatic pose estimation system for human faces based on bunch graph matching technology. Automatic Face and Gesture Recognition, pp.136-141, 1998.

P. Fitzpatrick, Head pose estimation without manual initialization. Term Paper for MIT Course, pp.6-892, 2001.

F. Fleuret and D. Geman, Fast face detection with precise pose estimation, International Conference on Pattern Recognition, pp.235-238, 2002.

W. T. Freeman and E. H. Adelson, The design and use of steerable filters, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol.13, issue.9, pp.891-906, 1991.
DOI : 10.1109/34.93808

C. Galev and A. F. Monk, Where am i looking? the accuracy of video-mediated gaze awareness. Perception and Psychophysics, pp.586-595, 2000.

A. Gee and R. Cipolla, Estimating gaze from a single view of a face, Proceedings of 12th International Conference on Pattern Recognition, pp.758-760, 1994.
DOI : 10.1109/ICPR.1994.576433

A. H. Gee and R. Cipolla, Non-intrusive gaze tracking for human-computer interaction, Proceedings of Mechatronics and Machine Vision in Practise, pp.112-117, 1994.

A. H. Gee and R. Cipolla, Determining the gaze of faces in images, Image and Vision Computing, vol.12, issue.10, 1994.
DOI : 10.1016/0262-8856(94)90039-6

A. H. Gee and R. Cipolla, Fast visual tracking by temporal consensus, Image and Vision Computing, vol.14, issue.2, pp.105-114, 1996.
DOI : 10.1016/0262-8856(95)01044-0

J. Gips, P. Olivieri, and J. J. Tecce, Direct control of the computer through electrodes placed around the eyes, Human-Computer Interaction: Applications and Case Studies, pp.630-635, 1993.

S. Gong, S. Mckenna, and J. J. Collins, An investigation into face pose distributions. Automatic Face and Gesture Recognition, pp.265-270, 1996.
DOI : 10.1109/afgr.1996.557275
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.102.4760

S. Gong, E. J. Ong, and S. Mckenna, Learning to Associate Faces across Views in Vector Space of Similarities to Prototypes, Procedings of the British Machine Vision Conference 1998, pp.54-63, 1998.
DOI : 10.5244/C.12.6

N. Gourier, Extraction de caractéristiques du visage pour estimer la pose, 2003.

N. Gourier, D. Hall, and J. L. Crowley, Estimating face orientation from robust detection of salient facial features, Proceedings of Pointing 2004, ICPR International Workshop on Visual Observation of Deictic Gestures, pp.17-25, 2004.

N. Gourier, D. Hall, and J. L. Crowley, Facial features detection robust to pose, illumination and identity, 2004 IEEE International Conference on Systems, Man and Cybernetics (IEEE Cat. No.04CH37583), pp.617-622, 2004.
DOI : 10.1109/ICSMC.2004.1398368
URL : https://hal.archives-ouvertes.fr/hal-01253456

N. Gourier and J. Letessier, The pointing'04 data sets, Proceedings of Pointing 2004, ICPR International Workshop on Visual Observation of Deictic Gestures, pp.1-4, 2004.

N. Gourier, J. Maisonnasse, D. Hall, and J. Crowley, Head Pose Estimation on Low Resolution Images, CLEAR Workshop Conjunction with Face and Gesture, 2006.
DOI : 10.1007/978-3-540-69568-4_24

D. Hall, Viewpoint Independant Object Recognition from Local Appearence, 2001.

D. Hall, A system for object class detection. Cognitive Vision Systems, 2004.

D. Hall and J. Crowley, Computation of generic features for object classification. ScaleSpace, 2003.

I. Haritaoglu, D. Harwood, and L. S. David, Hydra: Multiple people detection and tracking using silhouettes, Second IEEE Workshop on Visual Surveillance, 1999.
DOI : 10.1109/iciap.1999.797608

C. Harris and M. Stephens, A Combined Corner and Edge Detector, Procedings of the Alvey Vision Conference 1988, pp.147-151, 1988.
DOI : 10.5244/C.2.23

J. Heinzmann and A. Zelinsky, 3-D facial pose and gaze point estimation using a robust real-time tracking paradigm, Proceedings Third IEEE International Conference on Automatic Face and Gesture Recognition, 1998.
DOI : 10.1109/AFGR.1998.670939

S. Y. Ho and H. L. Huang, An analytic solution for the pose determination of human faces from a monocular image, Pattern Recognition Letters, vol.19, issue.11, pp.1045-1054, 1998.
DOI : 10.1016/S0167-8655(98)00084-1

T. Horprasert, Y. Yacoob, and L. S. Davisn, Computing 3-D head orientation from a monocular image sequence, Proceedings of the Second International Conference on Automatic Face and Gesture Recognition, 1996.
DOI : 10.1109/AFGR.1996.557271

E. Horvitz, C. M. Kadie, T. Paek, and D. Hovel, Models of attention in computing and communication, Communications of the ACM, vol.46, issue.3, pp.52-59, 2003.
DOI : 10.1145/636772.636798

A. J. Howell and H. Buxton, Active vision techniques for visually mediated interaction, Object recognition supported by user interaction for service robots, pp.861-871, 2002.
DOI : 10.1109/ICPR.2002.1048298

F. J. Huang, Z. Zhou, H. Zang, and T. Chen, Pose invariant face recognition, Proceedings of Fourth International Conference on Automatic Face and Gesture Recognition, pp.245-250, 2000.

J. Huang, X. Shao, and H. Wechsler, Face pose discrimination using support vector machines (SVM), Proceedings. Fourteenth International Conference on Pattern Recognition (Cat. No.98EX170), pp.154-156, 1998.
DOI : 10.1109/ICPR.1998.711102

K. S. Huang and M. M. Trivedi, Driver head pose and view estimation with single omnidirectionnal video stream, Third International Conference on Computer Vision Systems, pp.44-51, 2003.

D. H. Hubel, Eye, Brain, And Vision, Scientific American Library, 1988.

D. P. Huttenlocher and S. Ullman, Recognizing solid objects by alignment with an image, International Journal of Computer Vision, vol.35, issue.3, pp.195-212, 1990.
DOI : 10.1007/BF00054921

R. Ishiyama and S. Sakamoto, Fast and accurate facial pose estimation by aligning a 3D appearance model, Proceedings of the 17th International Conference on Pattern Recognition, 2004. ICPR 2004., 2004.
DOI : 10.1109/ICPR.2004.1333784

T. S. Jebara and A. Pentland, Parametrized structure from motion for 3D adaptive feedback tracking of faces, Proceedings of IEEE Computer Society Conference on Computer Vision and Pattern Recognition, pp.144-150, 1997.
DOI : 10.1109/CVPR.1997.609312

Q. Ji and R. Hu, 3D Face pose estimation and tracking from a monocular camera, Image and Vision Computing, vol.20, issue.7, pp.499-511, 2002.
DOI : 10.1016/S0262-8856(02)00024-0

S. C. Johnson, Hierarchical clustering schemes, Psychometrika, vol.58, issue.4, pp.241-254, 1967.
DOI : 10.1007/BF02289588

R. E. Kalman, A New Approach to Linear Filtering and Prediction Problems, Journal of Basic Engineering, vol.82, issue.1, pp.35-45, 1960.
DOI : 10.1115/1.3662552

J. Y. Kaminski, A. Shavit, D. Knaan, and M. Teicher, Head orientation and gaze detection from a single image, Computer Vision Theory and Applications, pp.85-92, 2006.

H. Kawanaka, H. Fujiyoshi, and Y. Iwahori, Human Head Tracking in Three Dimensional Voxel Space, 18th International Conference on Pattern Recognition (ICPR'06), 2006.
DOI : 10.1109/ICPR.2006.636

A. Kendon, Some functions of gaze-direction in social interaction, Acta Psychologica, vol.26, pp.22-63, 1967.
DOI : 10.1016/0001-6918(67)90005-4

D. Kersten, N. F. Troje, and H. H. Bülthoff, Phenomenal Competition for Poses of the Human Head, Perception, vol.4, issue.3, pp.367-368, 1996.
DOI : 10.1068/p250367

A. Kingstone, C. K. Friesen, and M. S. Gazzaniga, Reflexive Joint Attention Depends on Lateralized Cortical Connections, Psychological Science, vol.11, issue.2, pp.159-166, 2000.
DOI : 10.1111/1467-9280.00232

G. J. Klinker, S. A. Shafer, and T. Kanade, A physical approach to color image understanding, International Journal of Computer Vision, vol.22, issue.4, 1990.
DOI : 10.1007/BF00137441
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.13.875

J. J. Koenderink and A. J. Van-doorn, Representation of local geometry in the visual system, Biological Cybernetics, vol.53, issue.6, pp.367-375, 1987.
DOI : 10.1007/BF00318371

J. J. Koenderink and A. J. Van-doorn, Generic neighborhood operators, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol.14, issue.6, pp.597-605, 1992.
DOI : 10.1109/34.141551

T. Kohonen, Associative memory: A system theoretical approach, Communication and Cybernetics, 1977.
DOI : 10.1007/978-3-642-96384-1

N. Kruger, M. Potzsch, C. Von, and . Malsburg, Determination of face position and pose with a learned representation based on labelled graphs, Image and Vision Computing, vol.15, issue.8, pp.665-673, 1997.
DOI : 10.1016/S0262-8856(97)00012-7

V. Kruger, S. Bruns, and G. Sommer, Gabor wavelet networks for efficient head pose estimation, British Machine Vision Conference, 2000.
DOI : 10.1016/S0262-8856(02)00056-2

V. Kruger and G. Sommer, Gabor wavelets networks for object representation and face recognition, Deutsche Arbeitsgemeinschaft fiir Mustererkennung 22 DAGM-Symposium, 2000.

S. R. Langton, The mutual influence of gaze and head orientation in the analysis of social attention direction, Quarterly Journal of Experimental Psychology: Human Experimental Psychology, issue.3, pp.53-825, 2000.

S. R. Langton and V. Bruce, Reflexive Visual Orienting in Response to the Social Attention of Others, Visual Cognition, vol.55, issue.5, pp.541-567, 1999.
DOI : 10.1037/h0027474

T. K. Leung, M. C. Burl, and P. Perona, Finding faces in cluttered scenes using random labeled graph matching, Proceedings of IEEE International Conference on Computer Vision, 1995.
DOI : 10.1109/ICCV.1995.466878

S. Z. Li, Q. D. Fu, L. Gu, B. Scholkopf, Y. M. Cheng et al., Kernel machine based learning for multi-view face detection and pose estimation, Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001, 2001.
DOI : 10.1109/ICCV.2001.937691
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.16.720

T. Lindeberg, Feature detection with automatic scale selection, IJVC, vol.30, issue.2, pp.79-116, 1998.

D. Lisin, E. Risemann, and A. Hanson, Extracting Salient Image Features for Reliable Matching Using Outlier Detection Techniques, Computer Vision Systems Third International Conference, pp.481-491, 2003.
DOI : 10.1007/3-540-36592-3_46

G. David and . Lowe, Distinctive image features from scale-invariant keypoints, International Journal of Computer Vision, 2004.

D. G. Lowe, Object recognition from local scale-invariant features, Proceedings of the Seventh IEEE International Conference on Computer Vision, 1999.
DOI : 10.1109/ICCV.1999.790410
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.121.4065

X. Lu and A. K. Jain, Deformation modeling for robust 3d face matching, Computer Vision and Pattern Recognition, 2006.

B. Ma, W. Zhang, S. Shan, X. Chen, and W. Gao, Robust head pose estimation using lgbp, Proceedings of ICPR, Hong-Kong, 2006.

J. Maisonnasse, N. Gourier, O. Brdiczka, and P. Reignier, Attentional Model for Perceiving Social Context in Intelligent Environments, 3rd IFIP Conference on Artificial Intelligence Applications and Innovations, 2006.
DOI : 10.1007/0-387-34224-9_20

J. Maisonnasse, N. Gourier, O. Brdiczka, P. Reignier, and J. L. Crowley, Detecting privacy in attention aware system, 2nd IET International Conference on Intelligent Environments (IE 06), 2006.
DOI : 10.1049/cp:20060700

S. Malassitis and M. G. Strintzis, Real-time head tracking and 3D pose estimation from range data, Proceedings 2003 International Conference on Image Processing (Cat. No.03CH37429), 2003.
DOI : 10.1109/ICIP.2003.1246816

M. Malciu and F. Preteux, A robust model-based approach for 3D head tracking in video sequences, Proceedings Fourth IEEE International Conference on Automatic Face and Gesture Recognition (Cat. No. PR00580), pp.169-174, 2000.
DOI : 10.1109/AFGR.2000.840630
URL : https://hal.archives-ouvertes.fr/hal-00272441

J. Malik, S. Belongie, J. Shi, and T. Leung, Contour and Texture Analysis for Image Segmentation, Proceedings of IJCV, vol.43, issue.1, pp.7-27, 2001.
DOI : 10.1007/978-1-4615-4413-5_9

T. Maurer, C. Von, and . Malsburg, Tracking and learning graphs and pose on image sequences of faces, Proceedings of the Second International Conference on Automatic Face and Gesture Recognition, pp.176-181, 1996.
DOI : 10.1109/AFGR.1996.557261

S. Mckenna and S. Gong, Real-time face pose estimation, Real-Time Imaging, vol.4, issue.5, pp.333-347, 1998.
DOI : 10.1016/S1077-2014(98)90003-1

S. Mckenna, S. Gong, and J. J. Collins, Face Tracking and Pose Representation, Procedings of the British Machine Vision Conference 1996, pp.755-764, 1996.
DOI : 10.5244/C.10.31

S. J. Mckenna, S. Gong, R. P. Wurtz, J. Tanner, and D. Banin, Tracking facial feature points with Gabor wavelets and shape models, Proceedings of the 1st International Conference on Audio-and Videobased Biometric Person Authentication, 1997.
DOI : 10.1007/BFb0015977

K. Mikolajczyk and C. Schmid, Scale & Affine Invariant Interest Point Detectors, International Journal of Computer Vision, vol.60, issue.1, pp.63-86, 2004.
DOI : 10.1023/B:VISI.0000027790.02288.f2
URL : https://hal.archives-ouvertes.fr/inria-00548554

D. Miyauchi, A. Sakurai, A. Nakamura, and Y. Kuno, Human-robot eye contact through observations and actions, Proceedings of the 17th International Conference on Pattern Recognition, 2004. ICPR 2004., 2004.
DOI : 10.1109/ICPR.2004.1333785

L. Morency, P. Sundberg, and T. Darrell, Pose estimation using 3D view-based eigenspaces, 2003 IEEE International SOI Conference. Proceedings (Cat. No.03CH37443), 2003.
DOI : 10.1109/AMFG.2003.1240823

M. C. Motwani, Robust 3d head pose classification using wavelets, 2003.

M. C. Motwani and Q. Ji, 3D face pose discrimination using wavelets, Proceedings 2001 International Conference on Image Processing (Cat. No.01CH37205), 2001.
DOI : 10.1109/ICIP.2001.959229

M. A. Nacenta, S. Sallam, B. Champoux, S. Subramanian, and C. Gutwin, Perspective cursor, Proceedings of the SIGCHI conference on Human Factors in computing systems , CHI '06, pp.289-298, 2006.
DOI : 10.1145/1124772.1124817

A. Negre, H. Tran, N. Gourier, D. Hall, A. Lux et al., Object recognition invariant to viewpoint. Caviar deliverable, 2005.

A. Negre, H. Tran, N. Gourier, D. Hall, A. Lux et al., Comparative Study of People Detection in Surveillance Scenes, Structural and Syntactic Pattern Recognition Workshop Cunjunction with ICPR, 2006.
DOI : 10.1007/11815921_10

J. Ng and S. Gong, Multi-view face detection and pose estimation using a composite support vector machine across the view sphere, Proceedings International Workshop on Recognition, Analysis, and Tracking of Faces and Gestures in Real-Time Systems. In Conjunction with ICCV'99 (Cat. No.PR00378), pp.14-21, 1999.
DOI : 10.1109/RATFG.1999.799218

A. Nikolaidis and I. Pitas, Facial feature extraction and pose determination, International Conference on Pattern Recognition, pp.1783-1791, 2000.

S. Niyogi and W. T. Freeman, Example-based head tracking, Proceedings of the Second International Conference on Automatic Face and Gesture Recognition, 1996.
DOI : 10.1109/AFGR.1996.557294
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.10.3928

S. Ohayon and E. Rivlin, Robust 3d head tracking using camera pose estimation, Proceedings of ICPR, Hong-Kong, 2006.

E. Ong, S. J. Mckenna, and S. Gong, Tracking head pose for inferring intention. European Workshop on Perception of Human Action, 1998.

T. Otsuka and J. Ohya, Real-time estimation of head motion using weak perspective epipolar geometry, Proceedings Fourth IEEE Workshop on Applications of Computer Vision. WACV'98 (Cat. No.98EX201), 1998.
DOI : 10.1109/ACV.1998.732883

C. A. Perez, V. A. Lazcano, P. A. Estevez, and C. M. Held, Real-time iris detection on faces with coronal axis rotation, Proceedings of Systems, Man and Cybernetics, 2004.

G. Peters, A system for Object Class Detection, 2002.

C. Prablanc, Cours de neurophysiologie, 2003.

F. Preteux and M. Malciu, Model-based head tracking and 3d pose estimation, Proceedings of SPIE Conference on Mathematical Modeling and Estimation Techniques in Computer Vision, pp.94-110, 1998.
URL : https://hal.archives-ouvertes.fr/hal-00272476

R. Rae and H. Ritter, Recognition of human head orientation based on artificial neural networks, IEEE Conference on Computer Vision and Pattern Recognition, pp.257-265, 1998.

R. P. Rao and D. H. Ballard, An active vision architecture based on iconic representations, Artificial Intelligence, vol.78, issue.1-2, pp.461-505, 1995.
DOI : 10.1016/0004-3702(95)00026-7

B. Schiele, Object recognition using multidimensional receptive field histograms, 1997.
DOI : 10.1007/BFb0015571
URL : https://hal.archives-ouvertes.fr/tel-00004962

B. Schiele and J. Crowley, Object recognition without correspondence using multidimensionnal receptive fields histograms, International Journal of Computer Vision, vol.36, issue.1, pp.31-50, 2000.
DOI : 10.1023/A:1008120406972

B. Schiele and A. Waibel, Gaze tracking based on face-color, Proceedings of International Workshop on Automatic Face and Gesture Recognition, pp.344-349, 1995.

C. Schmid, Appariement d'images par invariants locaux de niveaux de gris, 1996.
URL : https://hal.archives-ouvertes.fr/tel-00005019

C. Schmid, Constructing models for content-based image retrieval, Proceedings of the 2001 IEEE Computer Society Conference on Computer Vision and Pattern Recognition. CVPR 2001, 2001.
DOI : 10.1109/CVPR.2001.990922
URL : https://hal.archives-ouvertes.fr/inria-00548274

K. Schwerdt and J. Crowley, Robust face tracking using color, Proceedings Fourth IEEE International Conference on Automatic Face and Gesture Recognition (Cat. No. PR00580), pp.90-95, 2000.
DOI : 10.1109/AFGR.2000.840617

J. Sherrah and S. Gong, Fusion of Perceptual Cues using Covariance Estimation, Procedings of the British Machine Vision Conference 1999, pp.564-573, 1999.
DOI : 10.5244/C.13.56

J. Sherrah, S. Gong, and E. Ong, Understanding Pose Discrimination in Similarity Space, Procedings of the British Machine Vision Conference 1999, 1999.
DOI : 10.5244/C.13.52

I. Shimizu, Z. Zang, S. Akamatsu, and K. Deguchi, Head pose determination from one image using a generic model, Proceedings Third IEEE International Conference on Automatic Face and Gesture Recognition, pp.100-105, 1998.
DOI : 10.1109/AFGR.1998.670932

D. Sinley, Laser and led eye hazard : Safety standard, Optics Photonics News, pp.32-37, 1997.

D. Slepian and H. O. Pollack, Prolate Spheroidal Wave Functions, Fourier Analysis and Uncertainty - I, Bell System Technical Journal, vol.40, issue.1, pp.43-63, 1961.
DOI : 10.1002/j.1538-7305.1961.tb03976.x

P. Smith, N. Shah, V. Da, and . Lobo, Determining driver visual attention with one camera, IEEE Transactions on Intelligent Transportation Systems, vol.4, issue.4, pp.205-218, 2003.
DOI : 10.1109/TITS.2003.821342

S. Srinivasan and K. L. Boyer, Head pose estimation using view based eigenspaces, Object recognition supported by user interaction for service robots, pp.302-305, 2002.
DOI : 10.1109/ICPR.2002.1047456

B. Steinzor, The spatial factor in face to face discussion groups., The Journal of Abnormal and Social Psychology, vol.45, issue.3, pp.552-555, 1950.
DOI : 10.1037/h0061767

R. Stiefelhagen, Tracking and Modeling Focus of Attention in Meetings, 2002.

R. Stiefelhagen, Tracking focus of attention in meetings, Proceedings. Fourth IEEE International Conference on Multimodal Interfaces, pp.273-280, 2002.
DOI : 10.1109/ICMI.2002.1167006

R. Stiefelhagen, Estimating head pose with neural networks -results on the pointing04 icpr workshop evaluation data, Proceedings of Pointing 2004, ICPR International Workshop on Visual Observation of Deictic Gestures, 2004.

R. Stiefelhagen, M. Finke, J. Yang, and A. Waibel, From gaze to focus of attention. Visual Information and Information Systems, pp.761-768, 1999.

R. Stiefelhagen, J. Yang, and A. Waibel, A Model-Based Gaze Tracking System, International Journal on Artificial Intelligence Tools, vol.06, issue.02, pp.193-209, 1997.
DOI : 10.1142/S0218213097000116

R. Stiefelhagen, J. Yang, and A. Waibel, Tracking eyes and monitoring eye gaze, Proceedings of the Workshop on Perceptual User Interfaces, 1997.

R. Stiefelhagen, J. Yang, and A. Waibel, Modeling people's focus of attention, Proceedings IEEE International Workshop on Modelling People. MPeople'99, 1999.
DOI : 10.1109/PEOPLE.1999.798349

R. Stiefelhagen, J. Yang, and A. Waibel, Simultaneous tracking of head poses in a panoramic view, Proceedings 15th International Conference on Pattern Recognition. ICPR-2000, 2000.
DOI : 10.1109/ICPR.2000.903646

R. Stiefelhagen, J. Yang, and A. Waibel, Tracking focus of attention for human-robot communication, IEEE-RAS International Conference on Humanoid Robots Humanoids, 2001.

R. Stiefelhagen and J. Zhu, Head orientation and gaze direction in meetings, CHI '02 extended abstracts on Human factors in computing systems , CHI '02, 2002.
DOI : 10.1145/506443.506634
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.10.5278

M. Storing, Computer Vision and Human Skin Color, 2004.

K. Sung and T. Poggio, Example-based learning for view-based human face detection, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol.20, issue.1, pp.39-51, 1998.
DOI : 10.1109/34.655648
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.103.3872

K. Tanaka, Mechanisms of visual object recognition: monkey and human studies, Current Opinion in Neurobiology, vol.7, issue.4, pp.523-529, 1997.
DOI : 10.1016/S0959-4388(97)80032-3

K. Toyama, Hands-free cursor control with real-time 3d face tracking, Proceedings of Workshop on Perceptual User Interfaces (PUI'98, 1998.

K. Toyama, Prolegomena for robust face tracking, Presented at the Post-ECCV Workshop on Advances in Facial Image Analysis and Recognition Technology, 1998.

T. T. Tran, Étude des lignes naturelles pour la représentation d'objets en vision par ordinateur, 2006.

J. Tu, Y. Fu, Y. Hu, and T. Huang, Evaluation of Head Pose Estimation for Studio Data, CLEAR Workshop Conjunction with Face and Gesture, 2006.
DOI : 10.1007/978-3-540-69568-4_25

M. Turk and A. Pentland, Eigenfaces for Recognition, Journal of Cognitive Neuroscience, vol.10, issue.9, pp.71-96, 1991.
DOI : 10.1007/BF00239352

L. Vacchetti, V. Lepetit, and P. Fua, Stable real-time 3D tracking using online and offline information, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol.26, issue.10, pp.1385-1391, 2004.
DOI : 10.1109/TPAMI.2004.92
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.87.3000

D. Valentin, H. Abdi, and A. O. Toole, CATEGORIZATION AND IDENTIFICATION OF HUMAN FACE IMAGES BY NEURAL NETWORKS: A REVIEW OF THE LINEAR AUTOASSOCIATIVE AND PRINCIPAL COMPONENT APPROACHES, Journal of Biological Systems, vol.02, issue.03, pp.413-429, 1994.
DOI : 10.1142/S0218339094000258

A. C. Varchmin, R. Rae, and H. Ritter, Image based recognition of gaze direction using adaptative methods, Proceedings of International Gesture Workshop, pp.245-257

R. C. Verma, C. Schmid, and K. Mikolajczyk, Face detection and tracking in a video by propogating detection probabilities. Pattern Analysis and Machine Intelligence, 2003.

P. Viola and M. Jones, Rapid object detection using a boosted cascade of simple features, Proceedings of the 2001 IEEE Computer Society Conference on Computer Vision and Pattern Recognition. CVPR 2001, 2001.
DOI : 10.1109/CVPR.2001.990517

M. Voit, K. Nickel, and R. Stiefelhagen, Neural Network-Based Head Pose Estimation and Multi-view Fusion, CLEAR Workshop Conjunction with Face and Gesture, 2006.
DOI : 10.1007/978-3-540-69568-4_26

K. N. Walker, T. F. Cootes, and C. Taylor, Automatically building appearance models from image sequences using salient features, Image and Vision Computing, vol.20, issue.5-6, pp.5-6435, 2002.
DOI : 10.1016/S0262-8856(02)00014-8
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.16.2173

C. Wang and M. Brandstein, Robust head pose estimation by machine learning, Proceedings 2000 International Conference on Image Processing (Cat. No.00CH37101), pp.210-213, 2000.
DOI : 10.1109/ICIP.2000.899332

J. G. Wang and E. Sung, Pose determination of human faces by using vanishing points, Pattern Recognition, vol.34, issue.12, pp.2427-2445, 2001.
DOI : 10.1016/S0031-3203(00)00154-0

Y. Wang, Y. Liu, L. Tao, and G. Xu, Real-Time Multi-View Face Detection and Pose Estimation in Video Stream, 18th International Conference on Pattern Recognition (ICPR'06), 2006.
DOI : 10.1109/ICPR.2006.964

Y. Wei, L. Fradet, and T. Tan, Head pose estimation using gabor eigenspace modeling, IEEE ICIP, vol.1, pp.281-284, 2002.

L. Wiskott, J. Fellous, N. Kruger, C. Von, and . Malsburg, Face recognition by elastic bunch graph matching, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol.19, issue.7, pp.775-779, 1997.
DOI : 10.1109/34.598235
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.120.4805

J. Wu, J. M. Pedersen, D. Putthividhya, D. Norgaard, and M. M. Trivedi, A two-level pose estimation framework using majority voting of gabor wavelets and bunch graph analysis, Proceedings of Pointing 2004, ICPR International Workshop on Visual Observation of Deictic Gestures, 2004.

J. Wu and M. Trivedi, An Integrated Two-Stage Framework for Robust Head Pose Estimation, Proceedings of Analysis and Modeling of Face and Gesture, pp.321-335, 2005.
DOI : 10.1007/11564386_25
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.74.4128

Y. Wu and K. Toyama, Wide-range, person-and illumination-insensitive head orientation estimation, Proceedings of Fourth International Conference on Automatic Face and Gesture Recognition, pp.183-188, 2000.

M. Xu and T. Akatsuka, Detecting head pose from stereo image sequence for active face recognition, Proceedings of Third International Conference on Automatic Face and Gesture Recognition, pp.82-87, 1998.

J. Yang, R. Stiefelhagen, U. Meier, and A. Waibel, Visual tracking for multimodal human computer interaction. Human Factors in Computing Systems, pp.140-147, 1998.
DOI : 10.1145/274644.274666
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.30.1225

P. Yao, G. Evans, and A. Calway, Using affine correspondance to estimate 3-d facial pose, Proceedings of 8th ICIP, pp.919-922, 2001.
DOI : 10.1109/icip.2001.958274
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.129.3831

A. L. Yarbus, Eye movements during perception of complex objects. Eye Movements and vision, pp.171-196, 1967.

L. Zhao, Dressed Human Modeling, Detection, and Part Localization, 2001.

Z. Zhu and Q. Ji, 3d face pose tracking from an uncalibrated monocolar camera, Proceedings of 17th International Conference on Pattern Recognition, 2004.

Z. Zhu and Q. Ji, Robust real-time face pose and facial expression recovery, Computer Vision and Pattern Recognition, 2006.

M. Zobel, A. Gebhard, D. Paulus, J. Denzler, and H. Niemann, Robust facial feature localization by coupled features, Proceedings Fourth IEEE International Conference on Automatic Face and Gesture Recognition (Cat. No. PR00580), pp.2-7, 2000.
DOI : 10.1109/AFGR.2000.840604
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.18.6604