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Summary: Abstract
An interactive user friendly graphical user interface
and a portable test were developed and used in a
performance evaluation study involving a population of
actual federal airport screeners. The paper describes a
series of linear and non-linear pseudo-coloring maps
designed and applied to single energy x-ray luggage
scans, to assist airport screeners in identifying and
detecting threat items, particularly hard to see
low-density weapons in luggage. Considerations of the
psychological and physiological processing involved in
the human perception of color as well as the effects of
using various color models and color transforms were
explored. Statistical analysis of screeners' evaluation
results proved the advantages of using color over gray
level data and also allowed the ranking of color maps
and selection of the best performing coloring scheme.
Rate improvements in weapon detection of up to 97%
were achieved through the use of color.
1. Introduction
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