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Summary: Header for SPIE use
Detection of Distortion in Small Moving Images, Compared to the
Predictions of a Spatio-Temporal Model
Kjell Brunnström
*
a, Bo N. Schenkman
a, Albert J. Ahumada Jr.
b
aACREO AB, Electrum 236, SE-164 40 Kista, Sweden
bNASA Ames Research Center, Moffett Field, CA 94035-1000
ABSTRACT
The image sequence discrimination model we use models optical blurring and retinal light adaptation. Two parallel
channels, sustained and transient, with different masking rules based on contrast gain control, are used. Performance of the
model was studied for two tasks representative of a video communication system with versions of monochrome H.263
compressed images§
. In the first study, five image sequences constituted pairs of non-compressed and compressed images to
be discriminated with a 2-alternative-forced-choice method together with a staircase procedure. The thresholds for each
subject were calculated. Analysis of variance showed that the differences between the pictures were significant. The model
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