W4: real-time surveillance of people and theiractivities
Haritaoglu, I.; Harwood, D.; Davis, L.S.
Pattern Analysis and Machine Intelligence, IEEE Transactions on
Volume 22, Issue 8, Aug 2000 Page(s):809 - 830
Digital Object Identifier 10.1109/34.868683
Summary:W4 is a real time visual surveillance system for
detecting and tracking multiple people and monitoring their activities
in an outdoor environment. It operates on monocular gray-scale video
imagery, or on video imagery from an infrared camera. W4
employs a combination of shape analysis and tracking to locate people
and their parts (head, hands, feet, torso) and to create models of
people's appearance so that they can be tracked through interactions
such as occlusions. It can determine whether a foreground region
contains multiple people and can segment the region into its constituent
people and track them. W4 can also determine whether people
are carrying objects, and can segment objects from their silhouettes,
and construct appearance models for them so they can be identified in
subsequent frames. W4 can recognize events between people and
objects, such as depositing an object, exchanging bags, or removing an
object. It runs at 25 Hz for 320×240 resolution images on a 400
MHz dual-Pentium II PC
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