Summary: Spatio­temporal discrimination model
predicts temporal masking functions
a a b
N
Albert J. Ahumada, Jr. , Bettina L. Beard , and Robert Eriksson
ASA Ames Research Center, Mail Stop 262­2, Moffett Field CA 94035
a
b Institute for Optical Research, Stockholm, Sweden
W
ABSTRACT
e present a simplified dual­channel discrimination model with spatio­temporal filters to represent the
t
s
visual system contrast sensitivity, and masking based on local spatio­temporal contrast energy. The contras
ensitivity filter parameters of the model were based on previous work. The masking and global sensitivity
h
t
parameters are calibrated to masking data using brief grating target signals masked by a 700 msec grating wit
he same spatial parameters.
Keywords: video, image quality, masking, vision models, target detection.

Source: Ahumada Jr., Al - Vision Science and Technology Group, Human Factors Research and Technology Division, NASA Ames Research Center

Collections: Engineering