12.: L'Atlas Saharien Sud - Oranais / par A. Cornet

• Record Nr.: UNINA990009875160403321
• Autore: Cornet, A.
• Pubbl/distr/stampa: Alger, : La Typo-Litho et J. Carbonel, 1952
• Descrizione fisica: 48 p., [1] c.di tav.f.t. : ill. ; 25 cm
• Collana: Algérie ; 12
• Disciplina: 965
• Locazione: DINGE; FAGBC
• Collocazione: Z 7/12; A CHI 690-12
• Lingua di pubblicazione: Francese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia

Visual affect recognition / / Ioanna-Ourania Stathopoulou and George A. Tsihrintzis

• Record Nr.: UNINA9910956071303321
• Autore: Stathopoulou Ioanna-Ourania
• Pubbl/distr/stampa: Washington, D.C., : IOS Press, 2010
• ISBN: 6612880414; 1-282-88041-1; 9786612880414; 1-60750-597-5
• Edizione: [1st ed.]
• Descrizione fisica: 1 online resource (267 p.)
• Collana: Frontiers in artificial intelligence and applications. Knowledge-based intelligent engineering systems, , 0922-6389 ; ; v. 214
• Altri autori (Persone): TsihrintzisGeorge A
• Soggetti: Computer vision; Visual perception; Facial expression; Emotions - Physiological aspects; Pattern recognition systems; Artificial intelligence
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Note generali: Bibliographic Level Mode of Issuance: Monograph
• Nota di bibliografia: Includes bibliographical references.
• Nota di contenuto: Title page -- Contents -- Introduction -- Motivation -- Organization of this monograph -- Psychological Studies on Emotion Perception -- Emotion vs affect vs feelings -- Emotions and culture -- Basic Emotions -- Culturally Specific Expressions of Emotions -- Higher Cognitive Emotions -- Neurobiology and Emotion Expression -- Cerebral Cortex -- Amygdala -- Superior Temporal Sulcus -- Implicit and Explicit Perception of Emotion -- Expression of Emotion -- Written Language -- Speech -- Facial Expressions -- Body movements and Hand gestures -- Facial Expression of Emotion -- Previous Attempts to Facial Emotion Quantification and Classification -- External Factors in Facial Emotion Perception -- Face and Facial Expressions: Their Role -- The Importance of Understanding Emotions -- Meeting Emotional Needs with the Help of Advanced Human-Computer Interaction Techniques -- Supporting emotional skill needs -- Supporting ; experiential needs -- Studies and Systems on Emotion Recognition -- Face Databases -- Specifying Requirements for an Ideal Facial Expression Database -- Previous Facial Expression Databases -- Section Summary - Results -- Face Detection -- Specifying Requirements for an Ideal Face Detection System -- Previous Works on Face Detection -- Section Summary - Results -- Facial Expression Classification System -- Specifying Requirements for our Facial Expression Classification System -- Facial Expression Classification Approaches -- Section Summary - Results -- Face Image Databases -- The Database of Low Quality Face Images (DBLQFI) -- The Database of High Quality Face Images (DBHQFI) -- Empirical Studies on Emotion Recognition -- Preliminary Questionnaires -- Newer (Detailed) Questionnaires -- The detailed questionnaire structure -- The observer and subject backgrounds -- Results from Statistical Analysis -- Statistical Analysis per Expression.; Difficulties of Facial Expression Classification as Outlined by the Participants -- Statistical Significance of the Results -- Extraction of Facial Expression Classification Features -- Summary - Conclusions -- Visual-Facial Emotion Recognition System -- Face Detection -- P. Sinha's Template -- The Face Detection Algorithm - Image Preprocessing -- Artificial Neural Network-Based Face Detectors -- Performance Evaluation -- Summary and Conclusions -- Introduction to our Facial Expression Recognition System -- First attempts for facial expression recognition -- The Facial Expression Classification Algorithm (1st Attempts) -- Feature Validation (First Attempts) -- Neural Network Classifiers (First Attempts) -- Results from neural network classifiers (First Attempts) -- Facial expression recognition system -- Feature Selection -- Image Preprocessing and Feature Extraction -- The extraction algorithm for the rest of facial features -- Combination of all and computation of feature vector -- Quantification of Feature Discrimination Power -- Classifiers for Facial Expression Classification -- Classification Performance Assessment -- More Sophisticated Classifiers -- Experimental performance evaluation -- Summary - Conclusions -- Human Motion and Gesture Analysis -- Introduction -- Human detection and motion tracking -- Marker-based approaches -- Markerless approaches -- Hand Gesture recognition -- The meaning of hand gestures -- Techniques for hand gesture recognition -- Emotion Recognition Systems from Body Movements and Gestures -- Conclusions and Future Work -- Summary and Conclusions -- Current and Future Work -- Towards a multimodal emotion recognition system -- Towards extending the visual-facial expression recognition.
• Sommario/riassunto: It is generally known that human faces, as well as body motions and gestures, provide a wealth of information about a person, such as age, race, sex and emotional state. This monograph primarily studies the perception of facial expression of emotion, and secondarily of motion and gestures, with the purpose of developing a fully automated visual affect recognition system for use in modes of human/computer interaction. The book begins with a survey of the literature on emotion perception, followed by a description of empirical studies conducted with human participants and the construction of a 'face image database'. On the basis of this work, a visual affect recognition system was developed, consisting of two modules: a face detection subsystem and a facial expression recognition subsystem.Details of this system are demonstrated and analyzed, and extensive performance evaluations and test results are provided. Finally, current research avenues leading to visual affect recognition via analysis of body motion and gestures are also discussed.

Permutation Groups / / by John D. Dixon, Brian Mortimer

• Record Nr.: UNINA9910971117503321
• Autore: Dixon John D
• Pubbl/distr/stampa: New York, NY : , : Springer New York : , : Imprint : Springer, , 1996
• ISBN: 1-4612-0731-2
• Edizione: [1st ed. 1996.]
• Descrizione fisica: 1 online resource (XII, 348 p.)
• Collana: Graduate Texts in Mathematics, , 2197-5612 ; ; 163
• Disciplina: 512.66
• Soggetti: K-theory; K-Theory
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Note generali: Bibliographic Level Mode of Issuance: Monograph
• Nota di bibliografia: Includes bibliographical references and index.
• Nota di contenuto: 1. The Basic Ideas -- 1.1. Symmetry -- 1.2. Symmetric Groups -- 1.3. Group Actions -- 1.4. Orbits and Stabilizers -- 1.5. Blocks and Primitivity -- 1.6. Permutation Representations and Normal Subgroups -- 1.7. Orbits and Fixed Points -- 1.8. Some Examples from the Early History of Permutation Groups -- 1.9. Notes -- 2. Examples and Constructions -- 2.1. Actions on k-tuples and Subsets -- 2.2. Automorphism Groups of Algebraic Structures -- 2.3. Graphs -- 2.4. Relations -- 2.5. Semidirect Products -- 2.6. Wreath Products and Imprimitive Groups -- 2.7. Primitive Wreath Products -- 2.8. Affine and Projective Groups -- 2.9. The Transitive Groups of Degree at Most 7 -- 2.10. Notes -- 3. The Action of a Permutation Group -- 3.1. Introduction -- 3.2. Orbits of the Stabilizer -- 3.3. Minimal Degree and Bases -- 3.4. Frobenius Groups -- 3.5. Permutation Groups Which Contain a Regular Subgroup -- 3.6. Computing in Permutation Groups -- 3.7. Notes -- 4. The Structure of a Primitive Group -- 4.1. Introduction -- 4.2. Centralizers and Normalizers in the Symmetric Group -- 4.3. The Socle -- 4.4. Subnormal Subgroups and Primitive Groups -- 4.5. Constructions of Primitive Groups with Nonregular Socles -- 4.6. Finite Primitive Groups with Nonregular Socles -- 4.7. Primitive Groups with Regular Socles -- 4.8. Applications of the O’Nan-Scott Theorem -- 4.9. Notes -- 5. Bounds on Orders of Permutation Groups -- 5.1. Orders of Elements -- 5.2. Subgroups of Small Index in Finite Alternating and Symmetric Groups -- 5.3. The Order of a Simply Primitive Group -- 5.4. The Minimal Degree of a 2-transitive Group -- ; 5.5. The Alternating Group as a Section of a Permutation Group -- 5.6. Bases and Orders of 2-transitive Groups -- 5.7. The Alternating Group as a Section of a Linear Group -- 5.8. Small Subgroups of Sn -- 5.9. Notes -- 6. The MathieuGroups and Steiner Systems -- 6.1. The Mathieu Groups -- 6.2. Steiner Systems -- 6.3. The Extension of AG2 (3) -- 6.4. The Mathieu Groups M 11 and M12 -- 6.5. The Geometry of PG 2 (4) -- 6.6. The Extension of PG 2 (4) and the Group M 22 -- 6.7. The Mathieu Groups M 23 and M 24 -- 6.8. The Geometry of W24 -- 6.9. Notes -- 7. Multiply Transitive Groups -- 7.1. Introduction -- 7.2. Normal Subgroups -- 7.3. Limits to Multiple Transitivity -- 7.4. Jordan Groups -- 7.5. Transitive Extensions -- 7.6. Sharply k-transitive Groups -- 7.7. The Finite 2-transitive Groups -- 7.8. Notes -- 8. The Structure of the Symmetric Groups -- 8.1. The Normal Structure of Sym(?) -- 8.2. The Automorphisms of Sym(?) -- 8.3. Subgroups of F Sym(?) -- 8.4. Subgroups of Small Index in Sym(?) -- 8.5. Maximal Subgroups of the Symmetric Groups -- 8.6. Notes -- 9. Examples and Applications of Infinite Permutation Groups -- 9.1. The Construction of a Finitely Generated Infinite p-group -- 9.2. Groups Acting on Trees -- 9.3. Highly Transitive Free Subgroups of the Symmetric Group -- 9.4. Homogeneous Groups -- 9.5. Automorphisms of Relational Structures -- 9.6. The Universal Graph -- 9.7. Notes -- Appendix A. Classification of Finite Simple Groups -- Appendix B. The Primitive Permutation Groups of Degree Less than 1000 -- References.
• Sommario/riassunto: Permutation Groups form one of the oldest parts of group theory. Through the ubiquity of group actions and the concrete representations which they afford, both finite and infinite permutation groups arise in many parts of mathematics and continue to be a lively topic of research in their own right. The book begins with the basic ideas, standard constructions and important examples in the theory of permutation groups.It then develops the combinatorial and group theoretic structure of primitive groups leading to the proof of the pivotal O'Nan-Scott Theorem which links finite primitive groups with finite simple groups. Special topics covered include the Mathieu groups, multiply transitive groups, and recent work on the subgroups of the infinite symmetric groups. This text can serve as an introduction to permutation groups in a course at the graduate or advanced undergraduate level, or for self- study. It includes many exercises and detailed references to the current literature.