Title
3D face shape adaptation across changes in viewpoint, lighting and reflectance
Document Type
Conference Paper
RIS ID
20862
Abstract
Four experiments are reported using face adaptation to look at encoding of three-dimensional (3D) face shape across changes in viewpoint, lighting direction and surface reflectance. Categorization as Japanese or Caucasian was used as a task. A face-space was defined in terms of a principal components analysis (PCA) of 3D feature point positions with Linear Discriminant Analysis (LDA) used to define a direction within that space that best captured ethnicity. Adaptation was measure as a change in the point of subjective equality (PSE) along that dimension. Experiment 1 showed a shift in the point of subjective equality in the direction of the adapting population that transferred between views (15° and 45°). Experiment 2 used exaggerated adapting faces and showed increased adaptation that transferred across a change in modelled surface reflectance as well as view (from 30° to 0° and 60°). Experiment 3 showed that adaptation was not affected by having the same or different lighting at adaptation and test. Experiment 4 tested adaptation from 0° to 90° and found a fall-off with increasing angle of rotation. The results are interpreted as evidence for the encoding of 3D face shape independent of image properties at least over a limited range of viewpoint.
COinS
Publication Details
Hill, HC, Watson, T and Vignal, G, 3D face shape adaptation across changes in viewpoint, lighting and reflectance, EPC 2007: 34th Australasian Experimental Psychology Conference, 2007, p 55-55, Canberra: Australian National University.