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Prior, Jessica Jayne. "Face values : children describing and recognising faces". Thesis, University of Westminster, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339245.
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Braithwaite, Gillian Mary. "Faces from the past : the face pots and face breakers of the Western Roman Empire". Thesis, University of London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394084.
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Hanafi, Marsyita. "Face recognition from face signatures". Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/10566.
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This thesis presents techniques for detecting and recognizing faces under various imaging conditions. In particular, it presents a system that combines several methods for face detection and recognition. Initially, the faces in the images are located using the Viola-Jones method and each detected face is represented by a subimage. Then, an eye and mouth detection method is used to identify the coordinates of the eyes and mouth, which are then used to update the subimages so that the subimages contain only the face area. After that, a method based on Bayesian estimation and a fuzzy membership function is used to identify the actual faces on both subimages (obtained from the first and second steps). Then, a face similarity measure is used to locate the oval shape of a face in both subimages. The similarity measures between the two faces are compared and the one with the highest value is selected. In the recognition task, the Trace transform method is used to extract the face signatures from the oval shape face. These signatures are evaluated using the BANCA and FERET databases in authentication tasks. Here, the signatures with discriminating ability are selected and were used to construct a classifier. However, the classifier was shown to be a weak classifier. This problem is tackled by constructing a boosted assembly of classifiers developed by a Gentle Adaboost algorithm. The proposed methodologies are evaluated using a family album database.
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Svedberg, Anna. "From face to face to e-learning". Thesis, Linköpings universitet, Institutionen för datavetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-108338.
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The aim of this project is to evaluate whether the e-learning material, that has been converted from face-to-face course material to e-learning materialon the basis of the revised version of Bloom's taxonomy and learning strategies, is pedagogical in the sense that the students realize the categories of the three domains of learning in Bloom's taxonomy. To achieve the aim of this project a face-to-face course will be converted to an e-learning course; that will then be evaluated. The results show thatthe e-learning material is pedagogical in the sense that the students realize the categories of the three domains of learning in Bloom's taxonomy, and the discussion indicates that the material is pedagogical to a certain extent. That is, some categories and aspect of the three domains of learning appear to have been realized, for example remembering, understanding, practicing, and adapting. The report includes a discussion on positive and negative aspects concerning attention, motivation, imitating, etc.
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Redley, Marcus. "Face-to-face interaction in research interviews". Thesis, University of Surrey, 1996. http://epubs.surrey.ac.uk/843382/.
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This thesis is an ethnography of the research interview. It presents an analysis of interviewer-interviewee interaction unencumbered by the methodological and practical concerns of research interviewers, for collecting reliable or valid data. The thesis argues that positivist and interactionist descriptions of the research interview, that are tied to interactional procedures for saving the referential quality of interview talk - by maximising or minimising respondent interviewer interaction - under-theorise the interaction they describe. Thus this thesis suspends any concern with the referential quality of interview data and draws upon a particular reading of the work of Goffman to analyse how participants accomplish a research interview as an intelligible interactional reality organised from within and how participants honour and accommodate each other as ritual selves in the primary roles of interviewee and interviewer. The thesis reviews positivist and interactionist descriptions of the research interview; makes the case for a Goffman style ritual analysis and presents an empirical analysis of qualitative interview talk.
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Keegin, Hillary. "Face to face with Jean Cocteau's Antigone". Thesis, Boston University, 1997. https://hdl.handle.net/2144/27686.
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Boston University. University Professors Program Senior theses.PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.
2031-01-02
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Mendes, Ana Irene Fonseca. "Caricatura e reconhecimento de faces". Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/59/59134/tde-05122012-140245/.
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A caricatura, uma imagem da face baseada no exagero de suas características peculiares, geralmente é reconhecida tão bem quanto a fotografia da face sem distorções. Para confecção das caricaturas, exageram-se as diferenças entre a imagem original e um protótipo (face média de um grupo de pessoas); e para confecção das anti-caricaturas essas diferenças são atenuadas. O objetivo desta pesquisa foi investigar se existe um grau de exagero ótimo para que a caricatura represente a face melhor que a fotografia original. Além disso, investigou- se o papel da percepção holística versus percepção componencial no processo de reconhecimento de faces. Foram geradas seis faces prototípicas, masculinas e femininas, de pessoas da população da região de Ribeirão Preto que se auto-declaram branca, parda e preta. A partir das faces prototípicas, foram gerados dois tipos de caricaturas e anticaricaturas: 1. holística: em que todas as diferenças entre a face original e a prototípica foram manipuladas, 2. parcial: em que somente as diferenças de alguns elementos faciais isolados ou combinados entre a face original e a prototípica foram manipuladas. No Experimento I os estímulos teste foram as caricaturas e anti-caricaturas holísticas. No Experimento II os estímulos foram as caricaturas e anti-caricaturas parciais. Em ambos experimentos as caricaturas e anti-caricaturas foram submetidas a julgamentos de similaridade com a face original previamente memorizada. Os resultados do Experimento I indicaram que a melhor representação da face é a fotografia sem distorção e que, nos casos em que a face é atípica em relação ao protótipo, as caricaturas tendem a ser representações tão fidedignas quanto as fotografias sem distorção. Os resultados do Experimento II apontam para a importância dos elementos peculiares no reconhecimento de faces. Comparando-se os resultados dos Experimentos I e II pode-se afirmar que o processamento de faces se dá predominantemente de forma holística e que a manipulação de elementos peculiares da face reduz mais a similaridade entre a face original e a caricatura (ou anti-caricatura) que a manipulação de elementos não-peculiares.A caricature is an exaggeration of distinctive facial features and is generally recognized just as well as an undistorted photograph of a face. Caricatures can be generated by exaggerating the differences between a face and a prototypical face (average face) and an anticaricature can be generated by reducing those differences. The aim of this study was to investigate whether there is a degree of caricaturing that best captures facial likeness. Moreover, we investigated the role of holistic perception versus componential perception in the facial recognition process. Six prototypical faces, three male and three female, were generated by morphing photographs of Brazilian people from the region of Ribeirão Preto-SP of different races: black, white and mixed race. Two types of caricatures and anticaricatures were generated: 1, holistic: by manipulating of all the differences between a face and the prototypical faces; 2, partial: by manipulating the differences of isolated or combined features between a face and the prototypical face. The stimuli used in Experiment 1 were the holistic caricatures and anticaricatures. In Experiment 2 the stimuli were the partial caricatures and anticaricatures. In both experiments, subjects were asked to rate the similarity between the caricatures and the anticaricatures and a face previously memorized. The results of Experiment 1 provide evidence that the best representation of the face is a photograph without distortion and that, when the face is atypical, the caricatures seem to be as good as photographs without distortion. The results of Experiment 2 point to the importance of the role of distinctive features in face recognition. Comparing the results of Experiments 1 and 2, we can say that the facial recognition process is predominantly holistic but that the manipulation of distinctive facial elements reduces the similarity judgment more than the manipulation of non-distinctive features.
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Pavani, Sri-Kaushik. "Methods for face detection and adaptive face recognition". Doctoral thesis, Universitat Pompeu Fabra, 2010. http://hdl.handle.net/10803/7567.
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The focus of this thesis is on facial biometrics; specifically in the problems of face detection and face recognition. Despite intensive research over the last 20 years, the technology is not foolproof, which is why we do not see use of face recognition systems in critical sectors such as banking. In this thesis, we focus on three sub-problems in these two areas of research. Firstly, we propose methods to improve the speed-accuracy trade-off of the state-of-the-art face detector. Secondly, we consider a problem that is often ignored in the literature: to decrease the training time of the detectors. We propose two techniques to this end. Thirdly, we present a detailed large-scale study on self-updating face recognition systems in an attempt to answer if continuously changing facial appearance can be learnt automatically.L'objectiu d'aquesta tesi és sobre biometria facial, específicament en els problemes de detecció de rostres i reconeixement facial. Malgrat la intensa recerca durant els últims 20 anys, la tecnologia no és infalible, de manera que no veiem l'ús dels sistemes de reconeixement de rostres en sectors crítics com la banca. En aquesta tesi, ens centrem en tres sub-problemes en aquestes dues àrees de recerca. En primer lloc, es proposa mètodes per millorar l'equilibri entre la precisió i la velocitat del detector de cares d'última generació. En segon lloc, considerem un problema que sovint s'ignora en la literatura: disminuir el temps de formació dels detectors. Es proposen dues tècniques per a aquest fi. En tercer lloc, es presenta un estudi detallat a gran escala sobre l'auto-actualització dels sistemes de reconeixement facial en un intent de respondre si el canvi constant de l'aparença facial es pot aprendre de forma automàtica.
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Grisé, Mary-Liz. "Information overload in face-to-face electronic meetings". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/nq22460.pdf.
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Powers, Megan C. "Communication at Tradeshows?Face-to-Face versus Online". Thesis, Gonzaga University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1558792.
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The question is regularly posed within communication academia as to whether computer mediated communication (CMC) is a "richer" form of communication than face-to-face (FtF). Similarly, the necessity of meeting FtF with regard to business has been repeatedly called into question since the downturn of the economy in 2008-2009. One reason professionals gather FtF is for tradeshows.
This thesis looks at the quality of the communication that takes place at FtF tradeshows, and reveals attitudes and opinions with regard to the importance of the relationship-building and commerce that occurs in person and/or online. The results inform what we can and cannot accomplish in these different environments.
331 professionals who have worked in tradeshows as a planner, an exhibitor, an attendee, or an executive took an online survey designed to reveal how they felt about the relationship-building and commerce that occurs in the tradeshow environment. The questions were focused on whether FtF, CMC, or a combination of the two is the solution, exploring the value and necessity of tradeshows. Additionally, an autoethnography highlights some personal experiences, having served within each of the professional roles with regard to tradeshows.
The results showed the respondents felt that CMC is not a replacement for the FtF communication that occurs at tradeshows, but it is a useful supplement to the FtF experience. The autoethnography echoed these sentiments, in addition to echoing the short answers of many of the respondents.
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Almeida, Lara Oleques de. "A atenuação metaenunciativa em interações face a face". Universidade Presbiteriana Mackenzie, 2017. http://tede.mackenzie.br/jspui/handle/tede/3266.
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La atenuación lingüística es una estrategia discursiva que tiene por objetivo minimizar la fuerza ilocutiva de los enunciados y el papel de los participantes en la enunciación respondiendo a fines argumentativos en la interacción (BRIZ y ALBELDA, 2013). En esta investigación, abordaremos las tácticas atenuantes que funcionan por medio de actividades metaenunciativas, entre las que se destaca una por poner en evidencia la presencia del otro en el discurso del hablante. De este modo, el objetivo general del presente trabajo es describir y analizar las estrategias de atenuación llevadas a cabo por procedimientos metaenunciativos de esa naturaleza en las interacciones cara a cara desde los fundamentos de la Lingüística Interaccional en diálogo con la Teoría de la Enunciación. El corpus de análisis está compuesto de segmentos de habla extraídos de entrevistas del Proyecto NURC/RJ (Proyecto de Estudio de la Norma Lingüística Urbana Culta de la ciudad de Río de Janeiro) y el enfoque metodológico es principalmente el cualitativo, aunque sin descuidar el análisis cuantitativo cuando este se muestra relevante para la explicación de los fenómenos estudiados. Los resultados de la investigación señalan que la expresión atenuante se corresponde con la propia expresión metaenunciativa cuando esta revela una no coincidencia del discurso consigo mismo (AUTHIER-REVUZ, 1998; 2004), lo que nos permite denominar a dicha estrategia lingüística como atenuación metaenunciativa, que se caracteriza sobre todo por la táctica de la ocultación del yo de la enunciación (BRIZ, 2012; ALBELDA et al., 2014) y se manifiesta en diferentes grados.
A atenuação linguística é uma estratégia discursiva que objetiva mitigar a força ilocucionária dos enunciados e o papel dos atores enunciativos atendendo a fins argumentativos na interação (BRIZ e ALBELDA, 2013). Nesta pesquisa, trataremos dos recursos atenuantes que operam por meio de atividades metaenunciativas, dentre as quais se destaca uma por colocar em evidência a presença do outro no discurso do falante. Assim, o objetivo geral do trabalho é descrever e analisar as estratégias de atenuação, realizadas por procedimentos metaenunciativos dessa natureza, nas interações face a face à luz de fundamentos da Linguística Interacional articulada com a Teoria da Enunciação. O corpus de análise é composto por segmentos de fala extraídos de inquéritos do Projeto NURC/RJ (Projeto de Estudo da Norma Linguística Urbana Culta da cidade do Rio de Janeiro) e a abordagem metodológica é eminentemente qualitativa, mas sem descurar da análise quantitativa quando esta se mostrar relevante para a explicação dos fenômenos em estudo. Os resultados da pesquisa apontam que a expressão atenuadora corresponde à própria expressão metaenunciativa quando esta revela uma não-coincidência do discurso consigo mesmo (AUTHIER-REVUZ, 2004;1998), o que nos autoriza a denominar essa estratégia linguística de atenuação metaenunciativa, que se caracteriza, principalmente, pelo recurso da ocultação do eu enunciativo (ALBELDA et al., 2014; BRIZ, 2012) manifestado em diferentes graus.
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Le, Khanh Duc. "A Study of Face Embedding in Face Recognition". DigitalCommons@CalPoly, 2019. https://digitalcommons.calpoly.edu/theses/1989.
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Face Recognition has been a long-standing topic in computer vision and pattern recognition field because of its wide and important applications in our daily lives such as surveillance system, access control, and so on. The current modern face recognition model, which keeps only a couple of images per person in the database, can now recognize a face with high accuracy. Moreover, the model does not need to be retrained every time a new person is added to the database.
By using the face dataset from Digital Democracy, the thesis will explore the capability of this model by comparing it with the standard convolutional neural network based on pose variations and training set sizes. First, we compare different types of pose to see their effect on the accuracy of the algorithm. Second, we train the system using different number of training images per person to see how many training samples are actually needed to maintain a reasonable accuracy.
Finally, to push the limit, we decide to train the model using only a single image per person with the help of a face generation technique to synthesize more faces. The performance obtained by this integration is found to be competitive with the previous results, which are trained on multiple images.
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Rosenfeld, David. "Sur la photographie : émoi et face-à-face /". Amiens (13 rue Latour, 80 000) : D. Rosenfeld, 1996. http://catalogue.bnf.fr/ark:/12148/cb37064907f.
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Geile, Andrea. "Face-to-Face-Kommunikation im Vertrieb von Industriegütern". Wiesbaden Gabler, 2009. http://d-nb.info/997723068/04.
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Wiker, Wikström Hannah. "Pre Face". Thesis, Konstfack, Institutionen för Konst (K), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-7775.
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A speculative inquiry into perception regimes, ‘unlearning’, entanglements and how to discuss re-production in the realm of (art) production today. A textual crossreading of how to actively admit and amplify the colonial and imperial consequences active in all levels of society, both personal and collective, and how these ideas continues to (re)produce in ways outside (and inside) of our imagination. An experimental essay negotiating the relations and symbioses between form an ideology, a try to undermine binary thought formations such as nature and culture, private and public. A proposed crossreading of theory and lived life; how to deal with the (im)possibility of imagining outside of neoliberal conditions, of colonial and capitalist frameworks?
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Zimmermann, Friederike Gisela Sophie. "Unfamiliar face recognition : how we perceive and remember new faces". Thesis, Birkbeck (University of London), 2013. http://bbktheses.da.ulcc.ac.uk/36/.
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Most humans are experts in recognizing faces of familiar individuals, but are poor at individuating unfamiliar faces. The discrepancy between these two types of face recognition suggests qualitative differences in the perceptual encoding and memory storage of familiar and unfamiliar faces, yet little is known about the neural basis of these differences. In the present thesis, behavioural and event-related brain potential (ERP) measures were combined to investigate the mechanisms that underlie the perception and recognition of unfamiliar faces. The first two experiments investigated whether memory traces for unfamiliar faces are based on low-level view-dependent or more high-level view-independent codes. Results provide strong evidence for a qualitative change from strictly view-dependent to view-independent representations in visual face memory as initially novel unfamiliar faces become more familiar. A second series of three experiments examined whether identity-specific cues are processed in an optional or obligatory fashion. Findings suggest that the perception of facial identity is strongly task-dependent (i.e., optional), even for famous faces, but can also show a degree of mandatory processing when identity is task-irrelevant. The sixth study examined the persistence of perceptual memories of unfamiliar faces and revealed a substantial weakening of face representations in visual working memory over short periods of time. The final experiment investigated the neural basis of developmental prosopagnosia (DP). Results demonstrated spared identity-sensitive processing in DP participants, indicating that their face recognition deficits do not always result from severely disrupted visual face recognition processes. However, despite evidence for perceptual learning of invariant aspects of face structure, these processes seemed to be inefficient in individuals with DP. Taken together, this thesis explored how we perceive and remember individual unfamiliar faces. Results indicate that unfamiliar face recognition is mediated by fast and flexible (i.e., strongly task-dependent) identity-specific visual processes, which rapidly become view-invariant during face learning.
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McRae, Beverley A. "Talk radio, face-to-face democracy in the '90s". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ27030.pdf.
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Martin, Kurt. "Le face à face : la relation éthique chez Lévinas". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0001/NQ43093.pdf.
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Eickholt, Molly S. "FACE THREAT, FACE SUPPORT, AND ADVICE EFFECTIVENESS FOLLOWING INFIDELITY". UKnowledge, 2013. http://uknowledge.uky.edu/comm_etds/15.
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This study examined advice interactions following infidelity. Participants (N = 213) completed a survey concerning an instance on infidelity and a subsequent advice interaction. Injured party perceptions of advice interactions were measured by examining advice messages, perceived face threat, and perceived face support, in addition to perceived effectiveness of the advice message. Results from this study showed no significant differences in perceived face threat, perceived face support, or advice effectiveness between different advice messages. Results also indicated both positive and negative face threat as negative predictors of advice effectiveness. While negative face support was a positive predictor of advice effectiveness, positive face support was a negative predictor. When controlling for relational closeness, negative face support was the only significant predictor of advice effectiveness.
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Kim, Kyunghee S. M. Massachusetts Institute of Technology. "Affect reflection technology in face-to-face service encounters". Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/55195.
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Thesis (S.M.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2009.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 87-91).
This thesis examines the role of facial expressions in dyadic interactions between a banking service provider and customer. We conduct experiments in which service providers manipulate their facial expressions while interacting with customers in one of three conditions: In the neutral condition the banker tried to maintain a neutral facial expression; in the smiling condition the banker tried to smile throughout the interaction; in the empathetic condition the banker tried to respond with the same or complementary facial expressions. Results show that the customers (n=46) were more satisfied with the interaction when they perceived the service provider was empathetic. More significantly, the service provider and customer shared synchronized facial expressions with many prolonged smiles, when customers said the service provider was empathetic. We suggested three different criteria to investigate customer satisfaction as follows; according to what the service provider tried to convey, what the customer perceived and what was actually detected in their interactions. According to the analysis of the interactions, smiling bankers who shared smiles were evaluated as the best while smiling bankers who did not share smiles with customers were appraised similar to non-smiling bankers.
by Kyunghee Kim.
S.M.
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Austin, Erin, i L. Lee Glenn. "Online and Face-To-Face Orthopaedic Surgery Education Methods". Digital Commons @ East Tennessee State University, 2012. https://dc.etsu.edu/etsu-works/7497.
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McRae, Beverley A. (Beverly Anne) Carleton University Dissertation Journalism and Communication. "Talk radio: Face-to-face democracy in the '90s". Ottawa, 1997.
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Oates, Melissa. "Differences in computer mediated versus face to face negotiation". Click here to view, 2009. http://digitalcommons.calpoly.edu/psycdsp/1/.
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Thesis (B.S.)--California Polytechnic State University, 2009.Project advisor: Daniel Levi. Title from PDF title page; viewed on Mar. 11, 2010. Includes bibliographical references. Also available on microfiche.
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Xu, Xiang. "Face hallucination with application in far distance face recognition". Thesis, Curtin University, 2014. http://hdl.handle.net/20.500.11937/1931.
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In this thesis, faces captured in far distances are investigated. Face enhancement algorithms are studied. Hallucinating faces in holistic model and patch-based model are analysed respectively. The advantages and disadvantages of both models are discussed. An innovative holistic model and patch-based model are proposed separately. More investigation in practical surveillance environments are carried. And a new far face recognition model is proposed. Experiments demonstrate the improvement of proposed approaches.
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Enmark, Sofie, i Sanna Alsén. "Face-To-Face eller Face-To-Facebook : En kvalitativ studie om två användarperspektivs inverkan på rekrytering". Thesis, Umeå universitet, Handelshögskolan vid Umeå universitet, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-45458.
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LI, Songyu. "A New Hands-free Face to Face Video Communication Method : Profile based frontal face video reconstruction". Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-152457.
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This thesis proposes a method to reconstruct a frontal facial video basedon encoding done with the facial profile of another video sequence.The reconstructed facial video will have the similar facial expressionchanges as the changes in the profile video. First, the profiles for boththe reference video and for the test video are captured by edge detection.Then, asymmetrical principal component analysis is used to model thecorrespondence between the profile and the frontal face. This allows en-coding from a profile and decoding of the frontal face of another video.Another solution is to use dynamic time warping to match the profilesand select the best matching corresponding frontal face frame for re-construction. With this method, we can reconstructed the test frontalvideo to make it have the similar changing in facial expressions as thereference video. To improve the quality of the result video, Local Lin-ear Embedding is used to give the result video a smoother transitionbetween frames.
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Al-Nuaimi, Tufool. "Face recognition and computer graphics for modelling expressive faces in 3D". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38333.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2007.Includes bibliographical references (leaves 47-48).
This thesis addresses the problem of the lack of verisimilitude in animation. Since computer vision has been aimed at creating photo-realistic representations of environments and face recognition creates replicas of faces for recognition purposes, we research face recognition techniques to produce photo-realistic models of expressive faces that could be further developed and applied in animation. We use two methods that are commonly used in face recognition to gather information about the subject: 3D scanners and multiple 2D images. For the latter method, Maya is used for modeling. Both methods produced accurate 3D models for a neutral face, but Maya allowed us to manually build 3D models and was therefore more successful in creating exaggerated facial expressions.
by Tufool Al-Nuaimi.
M.Eng.
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Bluemink, J. (Johanna). "Virtually face to face: enriching collaborative learning through multiplayer games". Doctoral thesis, Oulun yliopisto, 2011. http://urn.fi/urn:isbn:9789514294235.
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Abstract This study focused on enriching collaborative learning through pedagogically scripted multiplayer games. Collaborative learning was examined in the synchronous discussions of small group problem-solving activities in face-to-face and virtual game settings. The theoretical approach is socio-cognitive and builds on the contextual and situated nature of learning. Interaction between group members in social situations is a key mechanism fostering students’ collaborative learning. In the field of Computer-Supported Collaborative Learning the underlying aim is to stimulate and structure socially shared construction of knowledge and development of shared understanding among the collaborators. This thesis consisted of three empirical studies. The first study focused on analysing the macro-level elements of teacher education students’ face-to-face discussions in a context of an international web-based course. The focus of the second and third empirical studies was on how distributed collaboration can be enriched by scripting multiplayer game environments. The game environments were developed and tailored as part of the empirical studies. The main aim was to analyse small-group micro-level interactions and activities taking place during the game. Moreover, the particulars of a 3D voice-enhanced multiplayer game context for small-group shared collaborative activities were investigated. The focus of the last empirical study was on aspects of collaborative game activity and shared problem solving described from the perspective of individual players. The results indicated that the synchronous small-group discussions, on the macro-level, consisted of explaining, sharing knowledge, providing critiques, reflection, and joint engagement. The micro-level elements of the players’ discussions during the game were questions, content statements, social statements, suggestions, instructions or orders, encouragements, and responses. Both macro and micro level elements varied in random order during the discussion, forming a base for small-group discussion and joint problem-solving efforts. Not all problem-solving situations in the game data were shared, indicating that if shared collaborative activity was pursued, the scripting of the game tasks must require equal participation and teamwork during the game. The 3D game environment created a strong shared context for the distributed groups by engaging the players and reinforcing individual participation through the avatar activity. The findings of this thesis contribute to the future development of serious games and highlight the potential of multiplayer games as tools for supporting the social aspects of distributed teamworkTiivistelmä Väitöstutkimus tarkastelee yhteisöllisen oppimisen rikastamista pedagogisesti vaiheistettujen virtuaalipeliympäristöjen avulla. Tutkimuksessa on analysoitu pienryhmien sosiaalista vuorovaikutusta luokkahuonekeskusteluissa ja puhevälitteisissä peliympäristöissä. Teoreettisesti tutkimus pohjautuu sosiokognitiiviseen käsitykseen oppimisesta, jonka mukaan sosiaaliset tilanteet voivat käynnistää yksilöissä oppimisen kannalta keskeisiä mekanismeja, kuten esimerkiksi selittämistä ja tiedon jakamista. Yhteisöllisen oppimisen ytimeksi katsotaan jaetun ymmärryksen rakentaminen sosiaalisessa vuorovaikutuksessa, mitä tietokoneavusteisen yhteisöllisen oppimisen tutkimuslinjassa pyritään tukemaan vaiheistamalla oppimisympäristöjä. Tutkimus koostuu kolmesta eri osatutkimuksesta, joista ensimmäisessä analysoitiin korkeakouluopiskelijoiden pienryhmäkeskustelua luokkahuonetilanteessa. Lähitapaamiset toimivat kurssilla hajautetun kansainvälisen verkkotyöskentelyn tukena. Toisessa osatutkimuksessa tarkasteltiin, voiko hajautettua yhteisöllistä oppimista rikastaa puhevälitteisen monenpelaajan peliympäristön avulla. Pelin tehtävät suunniteltiin ja vaiheistettiin yhteisöllistä toimintaa vaativiksi sekä jaetun ymmärryksen rakentamista tukeviksi. Analyysi keskittyi korkeakouluopiskelijoiden pelinaikaisen keskustelun ja ongelmanratkaisutilanteiden tarkasteluun. Kolmannen osatutkimuksen tavoitteena oli tutkia, mitä osatekijöitä työelämäkontekstista tulleet osallistujat joutuivat hallitsemaan puhevälitteisessä monenpelaajan pelissä. Tutkimusten video- ja haastatteluaineistot analysoitiin laadullisen sisällönanalyysin menetelmin. Tutkimustulokset osoittivat, että pienryhmän vuorovaikutus koostuu makrotasolla mm. selittämisestä, tiedon jakamisesta ja reflektoinnista. Mikrotasolla mm. kysymykset, toteamukset, auttaminen ja ehdottaminen vaihtelivat puheenvuoroittain ja muodostivat yhteisen toiminnan pohjan pienryhmän pelaamisessa. Kaikki ongelmanratkaisutilanteet pelin aikana eivät kuitenkaan olleet jaettuja. Tulokset osoittavat, että kun tavoitellaan aidosti yhteisöllisiä tilanteita, pelin tehtävät täytyy vaiheistaa niin, että ne vaativat kaikkien osallistumista ja pitävät ryhmää virtuaalisesti yhdessä. Tässä tutkimuksessa käytetyt peliympäristöt muodostivat hajautetuille ryhmille vahvan jaetun tilan ja virtuaalisten ihmishahmojen eli avatarien kautta osallistuminen vahvisti yksilöiden toimijuutta pienryhmän osana. Tuloksia voidaan hyödyntää hajautetun tiimityön kontekstissa sekä käyttää tukena tulevaisuuden virtuaalisten tiimipelien suunnittelussa
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Dwyer, Ryan. "Smartphone use undermines enjoyment of face-to-face social interactions". Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/62669.
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Decades of research on human happiness points to one central conclusion: Engaging in positive social interactions is critical for well-being. The current smartphone revolution, however, may be altering how and when we derive these benefits. Using a field experiment and experience sampling, we found the first evidence that phone use may undermine the enjoyment people derive from real world social interactions. In Study 1, we recruited over 300 community members and students to share a meal at a restaurant with friends or family. Participants were randomly assigned to keep their phones on the table or to put their phones away during the meal. When phones were present (vs. absent), participants felt more distracted, which reduced how much they enjoyed spending time with their friends/family. We found consistent results using experience sampling in Study 2; during in-person interactions, participants felt more distracted and reported lower enjoyment if they used their phones than if they did not. This research suggests that despite their ability to connect us to others across the globe, phones may undermine the benefits we derive from interacting with those across the table.Arts, Faculty of
Psychology, Department of
Graduate
30
de, Haan E. H. F. "Disorders of face processing : an investigation of implicit face processing". Thesis, Lancaster University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233572.
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Madan, Anmol P. (Anmol Prem Prakash). "Social evolution : opinions and behaviors in face-to-face networks". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61933.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 133-143).
Exposure to new ideas and opinions, and their diffusion within social networks, are important questions in education, business, and government. However until recently there has been no method to automatically capture fine-grained face-to-face interactions between people, to better model the diffusion process. In this thesis, we describe the use of colocation and communication sensors in 'socially aware' mobile phones to model the spread of opinions and behaviors of 78 residents of an undergraduate residence hall for an entire academic year, based on over 320,000 hours of behavior data. Political scientists (Huckfeldt and Sprague, APSR, 1983) have noted the problem of mutual causation between face-to-face networks and political opinions. During the last three months of the 2008 US presidential campaigns of Barack Obama and John McCain, we find that political discussants have characteristic interaction patterns that can be used to recover the self-reported 'political discussant' ties within the community. Automatically measured mobile phone features allow us to estimate exposure to different types of opinions in this community. We propose a measure of 'dynamic homophily' which reveals surprising short-term, population-wide behavior changes around external political events such as election debates and Election Day. To our knowledge, this is the first time such dynamic homophily effects have been measured. We find that social exposure to peers in the network predicts individual future opinions (R 2 ~ 0.8, p < 0.001). The use of mobile phone based dynamic exposure increases the explained variance for future political opinions by up to 30%. It is well known that face-to-face networks are the main vehicle for airborne contagious diseases (Elliott, Spatial Epidemiology, 2000). However, epidemiologists have not had access to tools to quantitatively measure the likelihood of contagion, as a function of contact/exposure with infected individuals, in realistic scenarios (Musher, NEJM, 2003), since it requires data about both symptoms and social interactions between individuals. We use of co-location and communication sensors to understand the role of face-to-face interactions in the contagion process. We find that there are characteristic changes in behavior when individuals become sick, reflected in features like total communication, temporal structure in communication (e.g., late nights and weekends), interaction diversity, and movement entropy (both within and outside the university). These behavior variations can be used to infer the likelihood of an individual being symptomatic, based on their network interactions alone, without the use of health-reports. We use a recently-developed signal processing approach (Nolte, Nature, 2008) to better understand the temporal information flux between physical symptoms (i.e., common colds, influenza), measured behavior variations and mental health symptoms (i.e., stress and early depression). Longitudinal studies indicate that health-related behaviors from obesity (Christakis and Fowler, 2007) to happiness (Fowler and Christakis, 2008) may spread through social ties. The effects of social networks and social support on physical health are well-documented (Berkman, 1994; Marmot and Wilkinson, 2006). However, these studies do not quantify actual face-to-face interactions that lead to the adoption of health-related behaviors. We study the variations in BMI, weight (in lbs), unhealthy eating habits, diet and exercise, and find that social exposure measured using mobile phones is a better predictor of BMI change over a semester, than self-report data, in stark contrast to previous work. From a smaller pilot study of social exposure in face-to-face networks and the propagation of viral music, we find that phone communication and location features predict the sharing of music between people, and also identify social ties that are 'close friends' or 'casual acquaintances'. These interaction and music sharing features can be used to model latent influences between participants in the music sharing process.
by Anmol Madan.
Ph.D.
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Bazart, Cécile. "La fraude fiscale : modélisation du face à face Etat contribuables". Montpellier 1, 2000. http://www.theses.fr/2000MON10067.
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L'objectif des pouvoirs publics consiste à lever des fonds de manière tant équitable qu'efficace. Néanmoins, l'impôt, contribution obligatoire au financement des charges de l'Etat, est parfois éludé par les contribuables, notamment lorsque ces derniers pratiquent la fraude fiscale. Dès lors, en contrariant la collecte des ressources fiscales, ils impliquent une confrontation Etat - contribuables : un face à face fiscal. Dans un premier temps les contribuables font face à l'administration fiscale, établie par le gouvernement et chargée du recouvrement des sommes dues. Cette dernière doit adapter une politique coercitive, a visée répressive et d'exemplarité, qui doit permettre de favoriser la sincérité des déclarations. Cependant, l'ingéniosité des contribuables en matière fiscale et l'adaptation de ses stratégies de fraude, supposent une adaptation régulière des stratégies de contrôle mises en place par cette dernière. Néanmoins, il paraît nécessaire afin d'instaurer des mesures efficaces de prendre connaissance de la nature et des motivations des fraudeurs. Ainsi, le face à face fiscal décrit l'opposition de différents acteurs, au rôle souvent dual, et fournit un cadre d'étude adapté au phénomène de la fraude fiscale. Ce délit qui s'opère à l'encontre de l'Etat, n'est donc pas un délit ordinaire. En effet, cet acteur dispose, outre des ressources et de l'organisation nécessaire à la répression de ces comportements, du pouvoir fiscal. Ainsi, le gouvernement dispose-t-il d'une solution alternative pour limiter la fraude : l'adaptation de la structure fiscale.
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Holmes, Marcus. "The Force of Face-to-Face Diplomacy in International Politics". The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1307037152.
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Patrick, William Charles. "Investigation, Analysis, and Modeling of Longwall Face-to-Face Transfers". Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06092008-112841/.
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Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1993.Vita. Abstract. Attached pocket for diagrams. Includes bibliographical references (leaves 155-162). Also available via the Internet.
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Kumar, Sooraj. "Face recognition with variation in pose angle using face graphs /". Online version of thesis, 2009. http://hdl.handle.net/1850/9482.
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Wessner, Mark Daren. "Face to face [panim ʼel panim] in Old Testament literature /". Theological Research Exchange Network (TREN), 1998. http://www.tren.com.
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Wang, Zhiyuan. "Communication Modeling with Face-to-face Contacts-A Theoretical Perspective-". 京都大学 (Kyoto University), 2011. http://hdl.handle.net/2433/142199.
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Lee, Jinho. "Synthesis and analysis of human faces using multi-view, multi-illumination image ensembles". Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1133366279.
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Ratanjee-Vanmali, Husmita. "eHealth supported hearing care with online and face-to-face services - patient characteristics, experience and uptake of a hybrid online and face-to-face model". Thesis, University of Pretoria, 2020. http://hdl.handle.net/2263/77389.
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Hearing loss is considered a global health concern with 466 million people affected worldwide. Current hearing health care delivery models are based on several consecutive face-to-face consultations that occur in-person. Information and communications technology, and especially mobile technology, can be used to support or enhance health care delivery. This can be employed in addition, or as an alternative to, current patient treatment pathways.
This project developed a hybrid hearing health care approach by combining online and face-to-face services. The services were offered using a five-step approach: (1) online hearing screening, (2) motivational engagement by voice/video calling, messaging, or emailing, (3) diagnostic hearing testing in a face-to-face appointment, (4) counseling, hearing aid trial and fitting using face-to-face and online methods, and (5) online aural rehabilitation, counseling and ongoing coaching using face-to-face and online methods. Three studies were conducted.
Study I investigated the readiness, characteristics and behaviors of patients who sought hybrid hearing health care. Over three months (June–September 2017), 462 individuals completed the online hearing screening test: 59% (271/462) of those failed (age M = 60; SD = 12), indicating that further assessment and treatment might be required. These patients had been aware of their hearing loss for a period of between 5 to 16 years. A significant positive correlation was observed between age and speech reception threshold (r = 0.21; p < .001), where older participants presented with poorer scores. Five participants completed readiness measurement scales and attended a face-to-face diagnostic hearing evaluation during this time.
Study II investigated patient uptake, experience and satisfaction with hybrid hearing health care using a process evaluation. The process evaluation study was conducted over a three-month period for patients who sought services from the clinic over a period of 19 months (June 2017–January 2019). A total of 46 patients seen at the clinic were invited to complete an online questionnaire regarding their experiences and satisfaction with the steps completed and services provided. Of those, 31 (67%) patients responded (age M = 66; SD = 16). Of the 61% of patients who had previously sought hearing services, 95% reported the hybrid clinic services as superior. Two main themes emerged from the patient’s comparison of their experience with the hybrid clinic versus previous experiences: clinician engagement (personal attention, patience, dedication, thorough explanations, professional behavior, exceeding expectations, friendliness and trust) and technology (latest technology, advanced equipment and hearing aid trial). Patients who completed all five steps, including acquiring hearing aids and taking part in an online aural rehabilitation program (continued with hearing health care), were significantly older and had significantly poorer speech reception thresholds compared to those who did not acquire hearing aids after the diagnostic hearing test and hearing aid trial (discontinued hearing health care). A significant positive correlation was found between age and the number of face-to-face appointments attended per patient (r = 0.37; p = .007).
Study III investigated whether digital proficiency (proficiency with mobile devices and computers) was a predictor of the uptake of hybrid hearing health care. A total of 931 individuals failed the online hearing screening test and had submitted their details to the clinic for further care over a 24-month period (June 2017–June 2019). Of the 931 online test takers, 53 persons (age M = 64; SD = 15) who attended a face-to-face diagnostic hearing testing completed a mobile device and computer proficiency questionnaire. An exact regression model identified age as the factor associated with patients completing all five steps, including acquiring hearing aids and taking part in an online aural rehabilitation program (continued with hearing health care) from a hybrid model (β = .07; p = .018). Older patients were more likely to continue to seek hearing health care. Digital proficiency was not significantly associated with adults with hearing loss taking up services through a hybrid hearing health care model.
The results from these three studies demonstrate that asynchronous internet-based services such as an online hearing screening test can be used to create awareness of hearing health care. It is possible to provide online support to patients during the initial stages of seeking hearing health care online prior to the first face-to-face visit. Patient uptake, satisfaction and experience of using hybrid hearing health care services are positive when compared to traditional methods of service delivery. Hearing health care models that combine face-to-face and online methods hold promise for audiologists willing to incorporate online modalities into current treatment pathways. This research project highlights the opportunity for audiologists to provide services and personalized support to patients using a combination of face-to-face and online modalities.Thesis (PhD)--University of Pretoria, 2020.
This work was supported by the National Research Foundation (NRF) of South Africa under the grant number 107728.
Speech-Language Pathology and Audiology
PhD (Audiology)
Unrestricted
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Zhou, Shaohua. "Unconstrained face recognition". College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1800.
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Thesis (Ph. D.) -- University of Maryland, College Park, 2004.Thesis research directed by: Electrical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Westerlund, Tomas. "Fast Face Finding". Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2068.
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Face detection is a classical application of object detection. There are many practical applications in which face detection is the first step; face recognition, video surveillance, image database management, video coding.
This report presents the results of an implementation of the AdaBoost algorithm to train a Strong Classifier to be used for face detection. The AdaBoost algorithm is fast and shows a low false detection rate, two characteristics which are important for face detection algorithms.
The application is an implementation of the AdaBoost algorithm with several command-line executables that support testing of the algorithm. The training and detection algorithms are separated from the rest of the application by a well defined interface to allow reuse as a software library.
The source code is documented using the JavaDoc-standard, and CppDoc is then used to produce detailed information on classes and relationships in html format.
The implemented algorithm is found to produce relatively high detection rate and low false alarm rate, considering the badly suited training data used.
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Ustun, Bulend. "3d Face Recognition". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12609075/index.pdf.
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In this thesis, the effect of registration process is evaluated as well as several methods proposed for 3D face recognition. Input faces are in point cloud form and have noises due to the nature of scanner technologies. These inputs are noise filtered and smoothed before registration step. In order to register the faces an average face model is obtained from all the images in the database. All the faces are registered to the average model and stored to the database. Registration is performed by using a rigid registration technique called ICP (Iterative Closest Point), probably the most popular technique for registering two 3D shapes. Furthermore some variants of ICP are implemented and they are evaluated in terms of accuracy, time and number of iterations needed for convergence. At the recognition step, several recognition methods, namely Eigenface, Fisherface, NMF (Nonnegative Matrix Factorization) and ICA (Independent Component Analysis) are tested on registered and non-registered faces and the performances are evaluated.
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Espinosa-Romero, Arturo. "Situated face detection". Thesis, University of Edinburgh, 2001. http://hdl.handle.net/1842/6667.
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In the last twenty years, important advances have been made in the field of automatic face processing, given the importance of human faces for personal identification, emotional expression and verbal and non verbal communication. The very first step in a face processing algorithm is the detection of faces; while this is a trivial problem in controlled environments, the detection of faces in real environments is still a challenging task. Until now, the most successful approaches for face detection represent the face as a grey-level pattern, and the problem itself is considered as the classification between "face" and "non-face" patterns. Satisfactory results have been achieved in this area. The main disadvantage is that an exhaustive search has to be done on each image in order to locate the faces. This search normally involves testing every single position on the image at different scales, and although this does not represent an important drawback in off-line face processing systems, in those cases where a real-time response is needed it is still a problem. In the different proposed methods for face detection, the "observer" is a disembodied entity, which holds no relationship with the observed scene. This thesis presents a framework for an efficient location of faces in real scenes, in which, by considering both the observer to be situated in the world, and the relationships that hold between the two, a set of constraints in the search space can be defined. The constraints rely on two main assumptions; first, the observer can purposively interact with the world (i.e. change its position relative to the observed scene) and second, the camera is fully calibrated. The first source constraint is the structural information about the observer environment, represented as a depth map of the scene in front of the camera. From this representation the search space can be constrained in terms of the range of scales where a face might be found as different positions in the image. The second source of constraint is the geometrical relationship between the camera and the scene, which allows us to project a model of the subject into the scene in order to eliminate those areas where faces are unlikely to be found. In order to test the proposed framework, a system based on the premises stated above was constructed. It is based on three different modules: a face/non-face classifier, a depth estimation module and a search module. The classifier is composed of a set of convolutional neural networks (CNN) that were trained to differentiate between face and non-face patterns, the depth estimation modules uses a multilevel algorithm to compute the scene depth map from a sequence of images captured the depth information and the subject model into the image where the search will be performed in order to constrain the search space. Finally, the proposed system was validated by running a set of experiments on the individual modules and then on the whole system.
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O'Donnell, Christopher. "Investigating face familiarisation". Thesis, University of London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406725.
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Morris, Ryan L. "Hand/Face/Object". Kent State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=kent155655052646378.
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Logan, Andrew J., G. E. Gordon i G. Loffler. "Contributions of Individual Face Features to Face Discrimination". 2017. http://hdl.handle.net/10454/12462.
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yesFaces are highly complex stimuli that contain a host of information. Such complexity poses the following questions: (a) do observers exhibit preferences for specific information? (b) how does sensitivity to individual face parts compare? These questions were addressed by quantifying sensitivity to different face features. Discrimination thresholds were determined for synthetic faces under the following conditions: (i) ‘full face’: all face features visible; (ii) ‘isolated feature’: single feature presented in isolation; (iii) ‘embedded feature’: all features visible, but only one feature modified. Mean threshold elevations for isolated features, relative to full-faces, were 0.84x, 1.08, 2.12, 3.34, 4.07 and 4.47 for head-shape, hairline, nose, mouth, eyes and eyebrows respectively. Hence, when two full faces can be discriminated at threshold, the difference between the eyes is about four times less than what is required when discriminating between isolated eyes. In all cases, sensitivity was higher when features were presented in isolation than when they were embedded within a face context (threshold elevations of 0.94x, 1.74, 2.67, 2.90, 5.94 and 9.94). This reveals a specific pattern of sensitivity to face information. Observers are between two and four times more sensitive to external than internal features. The pattern for internal features (higher sensitivity for the nose, compared to mouth, eyes and eyebrows) is consistent with lower sensitivity for those parts affected by facial dynamics (e.g. facial expressions). That isolated features are easier to discriminate than embedded features supports a holistic face processing mechanism which impedes extraction of information about individual features from full faces.
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Logan, Andrew J., F. Wilkinson, H. R. Wilson, G. E. Gordon i G. Loffler. "The Caledonian face test: A new test of face discrimination". 2015. http://hdl.handle.net/10454/7691.
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yesThis study aimed to develop a clinical test of face perception which is applicable to a wide range of patients and can capture normal variability. The Caledonian face test utilises synthetic faces which combine simplicity with sufficient realism to permit individual identification. Face discrimination thresholds (i.e. minimum difference between faces required for accurate discrimination) were determined in an "odd-one-out" task. The difference between faces was controlled by an adaptive QUEST procedure. A broad range of face discrimination sensitivity was determined from a group (N=52) of young adults (mean 5.75%; SD 1.18; range 3.33-8.84%). The test is fast (3-4min), repeatable (test-re-test r2=0.795) and demonstrates a significant inversion effect. The potential to identify impairments of face discrimination was evaluated by testing LM who reported a lifelong difficulty with face perception. While LM's impairment for two established face tests was close to the criterion for significance (Z-scores of -2.20 and -2.27) for the Caledonian face test, her Z-score was -7.26, implying a more than threefold higher sensitivity. The new face test provides a quantifiable and repeatable assessment of face discrimination ability. The enhanced sensitivity suggests that the Caledonian face test may be capable of detecting more subtle impairments of face perception than available tests.
None
48
Tai, Chiu-Yuan, i 戴久芫. "Anti-cheat methods for face authentication system spoofed by high resolution fake face". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/jxte5t.
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碩士亞東技術學院
資訊與通訊工程研究所
103
Due to the multiple convenient qualities (quick, remote detection ability, non-contact), face detection has been widely applied in fields such as access control, monitoring, auto focusing systems, or verification of the subject’s identity and behavior. However, with the widespread adoption of face detection technique, spoofing technique had become increasingly advanced with face Information being forged or collected to deceive or bypass the verification of face detection system. Thus, it is crucial for the biometric system to identify the forged characteristics. In this thesis, three fake face detection strategies based on analyzing characteristics of high-definition display, including the brightness of face image, DCT component of face edge, and hue of face image, are proposed to detect the capturing images. By using a PNN model to establish the image analysis system, the system can effectively identify fake face images from the input sequences. Moreover, to reduce the error probability from a single shut, sequence analysis method is also proposed to improve the system identification correctness, thus increase the stability and practicability of the proposed system.
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Chen, Tzu-Pei Grace. "1,001,001 faces : a configural face navigation interface". Thesis, 2003. http://hdl.handle.net/2429/14355.
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Conventional face navigation systems focus on finding new faces via facial features.
Though intuitive, this method has limitations. Notably, it is geared
toward finding distinctive features, and hence, does not work as effectively on
"typical" faces. We present an alternative approach to searching and navigating
through an overall face configuration space. To do so, we implemented an interface
that shows gradients of faces arranged spatially using an n-dimensional
norm-based face generation method. Because our interface allows users to observe
faces holistically, facial composition information is not lost during searching,
an advantage over face component methods.
We compare our gradient based face navigation system with a typical, static,
slider-based system in a navigation task. Then we compare it with a hybrid dynamic
slider system. Results from our first pilot study show that our method
is more effective at allowing users to concentrate on face navigation when compared
with a static slider interface. This is helpful for face matching tasks as it
reduces the number of times users must re-examine faces. Results from our second
pilot study suggest that our interface is slightly more effective in coping with
correlated navigation axes when compared with a dynamic slider interface. Our
third pilot and the formal experiment confirm that while slider-based interfaces
are more suited for converging to proximity to the target face, gradient-based interfaces are better for refinement.
While it may be counter-intuitive that sliders, which are commonly used as interfaces for colour navigation, are inadequate for face matching tasks, our
results suggest that new interfaces, such as our gradient-based system and dynamic
sliders, are useful for navigation in higher dimensional face space.
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Elmahmudi, Ali A. M., i Hassan Ugail. "Experiments on deep face recognition using partial faces". 2018. http://hdl.handle.net/10454/16872.
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YesFace recognition is a very current subject of great interest in the area of visual computing. In the past, numerous face recognition and authentication approaches have been proposed, though the great majority of them use full frontal faces both for training machine learning algorithms and for measuring the recognition rates. In this paper, we discuss some novel experiments to test the performance of machine learning, especially the performance of deep learning, using partial faces as training and recognition cues. Thus, this study sharply differs from the common approaches of using the full face for recognition tasks. In particular, we study the rate of recognition subject to the various parts of the face such as the eyes, mouth, nose and the forehead. In this study, we use a convolutional neural network based architecture along with the pre-trained VGG-Face model to extract features for training. We then use two classifiers namely the cosine similarity and the linear support vector machine to test the recognition rates. We ran our experiments on the Brazilian FEI dataset consisting of 200 subjects. Our results show that the cheek of the face has the lowest recognition rate with 15% while the (top, bottom and right) half and the 3/4 of the face have near 100% recognition rates.
Supported in part by the European Union's Horizon 2020 Programme H2020-MSCA-RISE-2017, under the project PDE-GIR with grant number 778035.