Abstract
The number of intensity levels detected in briefly displayed textures was studied as a function of two related spatial parameters: granularity and spatial frequency. A texture-discrimination paradigm was used to determine the discriminability of an original texture and of a version of it reduced (further ‘quantized’) in intensity levels over a range of texture granularities and frequency bandwidths. Results show specific sensitivities to intensity level reductions as a function of the spatial-frequency composition of the textures, with particular loss of sensitivity in the higher spatial-frequency regions.
Get full access to this article
View all access options for this article.
References
1.
Caelli
T
Julesz
B
, 1978 “On perceptual analyzers underlying visual textures discrimination: Part I” Biological Cybernetics 28 167 –175 .
2.
Caelli
T
, 1981 Visual Perception: Theory and Practice (Oxford Pergamon Press ).
3.
Caelli
T
Bevan
P
, 1982 “Visual sensitivity to two-dimensional spatial phase” Journal of the Optical Society of America 72 1375 –1381 .
4.
Caelli
T
Julesz
B
Gilbert
E
, 1979 “On perceptual analyzers underlying visual texture discrimination: Part II” Biological Cybernetics 29 201 –214 .
5.
De Valois
R
De Valois
K
, 1980 “Spatial vision” Annual Review of Psychology 31 309 –341 .
6.
Dixon
W
, 1981 BMDP Statistical Software Manual (Los Angeles, CA : University of California Press ).
7.
Julesz
B
, 1971 Foundations of Cyclopean Perception (Chicago, IL : University of Chicago Press ).
8.
Julesz
B
, 1981 “Textons, the elements of texture perception, and their interactions” Nature (London) 290 91 –97 .
9.
Legge
G
Foley
J
, 1980 “Contrast masking in human vision” Journal of the Optical Society of America 70 1458 –1470 .
10.
Rosenfeld
A
Kak
A
, 1976 Digital Picture Processing (New York : Academic Press ).