Perception of spatiotemporal random fractals: an extension of colorimetric methods to the study of dynamic texture.
Recent work establishes that static and dynamic natural images have fractal-like l/falpha spatiotemporal spectra. Artifical textures, with randomized phase spectra, and 1/falpha amplitude spectra are also used in studies of texture and noise perception. Influenced by colorimetric principles and motivated by the ubiquity of 1/falpha spatial and temporal image spectra, we treat the spatial and temporal frequency exponents as the dimensions characterizing a dynamic texture space, and we characterize two key attributes of this space, the spatiotemporal appearance map and the spatiotemporal discrimination function (a map of MacAdam-like just-noticeable-difference contours).
Billock
V A
VA
Logicon, Inc, US Air Force Research Laboratory, Dayton, Ohio 45437-7558, USA.
Cunningham
D W
DW
Havig
P R
PR
Tsou
B H
BH
D003124:Colorimetry / Q000379:methods*; D015350:Contrast Sensitivity / Q000502:physiology*; D004192:Discrimination, Psychological; D017709:Fractals; D006801:Humans; D011897:Random Allocation; D013028:Space Perception / Q000502:physiology*; D013998:Time Perception / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*