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Articles 1 - 12 of 12
Full-Text Articles in Social and Behavioral Sciences
Visual Correlates Of Prosodic Contrastive Focus In French: Description And Inter-Speaker Variability, Marion Dohen, Helene Loevenbruck, Harold C. Hill
Visual Correlates Of Prosodic Contrastive Focus In French: Description And Inter-Speaker Variability, Marion Dohen, Helene Loevenbruck, Harold C. Hill
Harold Hill
This study is a follow-up of previous studies we conducted on the visible articulatory correlates of French prosodic contrastive focus. A two speaker analysis using an automatic lip-tracking device had shown that these correlates existed and were used in visual perception. However the articulatory strategies depended on the speaker. The purpose of this study was thus to extend the analysis to other speakers, examine the similarities and variabilities and try to identify global tendencies. We recorded five speakers of French with a 3D optical tracker using a 13 sentence (subject-verb-object) corpus and four focus conditions (S, V, O or neutral). …
Linking The Structure And Perception Of 3-D Faces: Gender, Ethnicity And Expressive Posture, Guillaume Vignali, Harold C. Hill, Eric Vatikiotis-Bateson
Linking The Structure And Perception Of 3-D Faces: Gender, Ethnicity And Expressive Posture, Guillaume Vignali, Harold C. Hill, Eric Vatikiotis-Bateson
Harold Hill
A statistical study of human face shape is reported whose overall goal was to identify and characterise salient components of facial structure for human perception and communicative behaviour. A large database of 3-D faces has been constructed and analysed for differences in ethnicity, sex, and posture. For each of more than 300 faces varying in race/ethnicity (Japanese versus Caucasian) and sex, nine postures (smiling, producing vowels, etc) were recorded. Principal components analysis (PCA) and linear discriminant analysis (LDA) were used to reduce the dimensionality of the data and to provide simple, yet reliable reconstruction of any face from components corresponding …
Review Of 'Handbook Of Face Recognition', Harold C. Hill
Review Of 'Handbook Of Face Recognition', Harold C. Hill
Harold Hill
The Handbook of Face Recognition is a collection of chapters designed as an introduction to the state-of-the-art in automatic face recognition. Recognition of identity is the primary focus, but face detection and expression categorisation are also covered in some detail. While this book is largely written by and aimed at engineers, the study of face recognition has always been a multidisciplinary exercise and this volume provides a valuable summary of one discipline's contribution.
Adaptation To Differences In 3-D Face Shape Across Changes In Viewpoint And Texture, Harold C. Hill, T Watson, G Vignali
Adaptation To Differences In 3-D Face Shape Across Changes In Viewpoint And Texture, Harold C. Hill, T Watson, G Vignali
Harold Hill
Abstract presented at The 28th European Conference on Visual Perception, 22-26 August 2005, A Coruña, Spain
Biological Motion And Face Perception In Autism Spectrum Disorder, K Ruparelia, J O'Brien, J Spencer, Harold C. Hill, A Johnston
Biological Motion And Face Perception In Autism Spectrum Disorder, K Ruparelia, J O'Brien, J Spencer, Harold C. Hill, A Johnston
Harold Hill
Abstract presented at The 29th European Conference on Visual Perception, 20-25 August 2006, St Petesburg, Russia
How Different Is Different? Investigating Criteria For Different Identity Judgments, Harold C. Hill, Michelle Corcoran, Peter Claes, John Clement
How Different Is Different? Investigating Criteria For Different Identity Judgments, Harold C. Hill, Michelle Corcoran, Peter Claes, John Clement
Harold Hill
Any face seen for the first time will have a closet neighbour in memory. In order to avoid false alarms, we must be able to distinguish similar from identical faces. Work is reported investigating same/different judgments as a function difference in three dimensional shape defined in terms of standard deviation in a principal component based face space. The aim is to determine the criterion difference below which observers respond “same”. A threshold corresponding to a dprime of 1 was also calculated. Both were first measured under three conditions – same view images, different view images and animated images of the …
Do Infants Use A Generalised Motion Processing System For Discriminating Facial Motion?, J V. Spencer, J M. O'Brien, Harold C. Hill, A Johnston
Do Infants Use A Generalised Motion Processing System For Discriminating Facial Motion?, J V. Spencer, J M. O'Brien, Harold C. Hill, A Johnston
Harold Hill
Abstract presented at The 28th European Conference on Visual Perception, 22-26 August 2005, A Coruña, Spain
Recognising Facial Expression From Spatially And Temporally Modified Movements, Frank E. Pollick, Harold C. Hill, Andrew Calder, Helena Paterson
Recognising Facial Expression From Spatially And Temporally Modified Movements, Frank E. Pollick, Harold C. Hill, Andrew Calder, Helena Paterson
Harold Hill
We examined how the recognition of facial emotion was influenced by manipulation of both spatial and temporal properties of 3-D point-light displays of facial motion. We started with the measurement of 3-D position of multiple locations on the face during posed expressions of anger, happiness, sadness, and surprise, and then manipulated the spatial and temporal properties of the measurements to obtain new versions of the movements. In two experiments, we examined recognition of these original and modified facial expressions: in experiment 1, we manipulated the spatial properties of the facial movement, and in experiment 2 we manipulated the temporal properties. …
The Hollow Face Illusion In Infancy, E Nakato, Harold C. Hill, Y Otsuka, S Kanazawa, M Yamaguchi
The Hollow Face Illusion In Infancy, E Nakato, Harold C. Hill, Y Otsuka, S Kanazawa, M Yamaguchi
Harold Hill
Abstract presented at The 30th European Conference on Visual Perception, 27-31 August 2007, Arezzo, Italy
Comparing Solid Body With Point-Light Animations, Harold C. Hill, Yuri Jinno, Alan Johnston
Comparing Solid Body With Point-Light Animations, Harold C. Hill, Yuri Jinno, Alan Johnston
Harold Hill
The movement of faces provides useful information for a variety of tasks and is now an active area of research. We compare here two ways of presenting face motion in experiments: as solid-body animations and as point-light displays. In the first experiment solid-body and point-light animations, based on the same motion-captured marker data, produced similar levels of performance on a sex-judgment task. The trend was for an advantage for the point-light displays, probably in part because of residual spatial cues available in such stimuli. In the second experiment we compared spatially normalised point-light displays of marker data with solid-body animations …
The Hollow-Face Illusion: Object Specific Knowledge, General Assumptions Or Properties Of The Stimulus, Harold C. Hill, Alan Johnston
The Hollow-Face Illusion: Object Specific Knowledge, General Assumptions Or Properties Of The Stimulus, Harold C. Hill, Alan Johnston
Harold Hill
The hollow-face illusion, in which a mask appears as a convex face, is a powerful example of binocular depth inversion occurring with a real object under a wide range of viewing conditions. Explanations of the illusion are reviewed and six experiments reported. In experiment 1 the detrimental effect of figural inversion, evidence for the importance of familiarity, was found for other oriented objects. The inversion effect held for masks lit from the side (experiment 2). The illusion was stronger for a mask rotated by 90° lit from its forehead than from its chin, suggesting that familiar patterns of shading enhance …
Matching Faces Across Rotations In View And Lighting, Simone K. Favelle, Harold C. Hill
Matching Faces Across Rotations In View And Lighting, Simone K. Favelle, Harold C. Hill
Harold Hill
It is important to look at the combined effects of lighting and view direction on face recognition, as both depend on the three dimensional shape of the face and are in some ways analogous. For example, both pitch rotations and the change between top and bottom lighting involve rotations about the left-right axis, just as yaw and left/right lighting involved rotations about the vertical axis. We investigated identity matching performance across 45° rotations of the light source or the face about pitch or yaw with all images shown either upright or inverted. Upright images were better matched than inverted images, …