Asymmetric Low Spatial Frequency Improves Face Discrimination
Date Issued
2010
Date
2010
Author(s)
Chen, Chin-Mei
Abstract
To study how the visual system compute 3D shape of faces from shading information, we manipulated the illumination conditions on 3D scanned face models and observed how the face discrimination changes with lighting directions . We used a symmetry algorithm to dissociate surface albedo and illumination component of face images by separating symmetric and asymmetric components of both low and high spatial frequency information of face images. Stimuli were hybrid faces with different combination of symmetric and spatial content. Results show that asymmetric low spatial frequency (shading) information had significant influence on face discrimination, while the symmetric ones have little, if any, effect on face discrimination. The asymmetric low spatial frequency also changed the perceived depth of hybrid faces. Together, these results suggest that (1) the asymmetric low spatial frequency information dramatically affects both perceived face identity and perceived depth; and (2) this effect increased as the lighting direction shifts to the side. Thus, our results provide an evidence for 3D-based face processing.
Subjects
Shape from shading
illumination
symmetry
face perception
3D object
File(s)![Thumbnail Image]()
Loading...
Name
ntu-99-R96227104-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):3e2f46640baf1db618d480215d5426ba