TY - JOUR
T1 - Lighting direction affects recognition of untextured faces in photographic positive and negative
AU - Hong Liu, Chang
AU - Collin, Charles A.
AU - Burton, A. Mike
AU - Chaudhuri, Avi
PY - 1999/12
Y1 - 1999/12
N2 - Face recognition in photographic positive and negative was examined in a same/different matching task in five lighting direction conditions using untextured 3-D laser-scanned faces. The lighting directions were +60, +30, 0, -30 and -60°, where negative values represent bottom lighting and positive values represent top lighting. Recognition performance was better for faces in positive than in negative when lighting directions were at +60°. In one experiment, the same effect was also found at +30°. However, faces in negative were recognized better than positive when the direction was -60°. There was no difference in recognition performance when the lighting direction was 0 and -30°. These results confirm that the effect of lighting direction can be a determinant of the photographic negative effect. Positive faces, which normally appear to be top-lit, may be difficult to recognize in negative partly because of the accompanying change in apparent lighting direction to bottom-lit.
AB - Face recognition in photographic positive and negative was examined in a same/different matching task in five lighting direction conditions using untextured 3-D laser-scanned faces. The lighting directions were +60, +30, 0, -30 and -60°, where negative values represent bottom lighting and positive values represent top lighting. Recognition performance was better for faces in positive than in negative when lighting directions were at +60°. In one experiment, the same effect was also found at +30°. However, faces in negative were recognized better than positive when the direction was -60°. There was no difference in recognition performance when the lighting direction was 0 and -30°. These results confirm that the effect of lighting direction can be a determinant of the photographic negative effect. Positive faces, which normally appear to be top-lit, may be difficult to recognize in negative partly because of the accompanying change in apparent lighting direction to bottom-lit.
UR - http://www.scopus.com/inward/record.url?scp=0344172725&partnerID=8YFLogxK
U2 - 10.1016/S0042-6989(99)00109-1
DO - 10.1016/S0042-6989(99)00109-1
M3 - Article
C2 - 10748933
AN - SCOPUS:0344172725
VL - 39
SP - 4003
EP - 4009
JO - Clinical Vision Sciences
JF - Clinical Vision Sciences
SN - 0042-6989
IS - 24
ER -