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criteria. By using such events not only that the amount of processing is reduced
which is of extreme importance in vision applications, but the process of gesture
segmentation is considerably facilitated. Events can also be intuitive for users which
are developing thus a mental model of how the interface works: for example, a
valid gesture always starts from one location and ends in another; a given posture
specifies the beginning of a command while discarding it ends the recording process;
a touch or a tap is clearly associated to the intent to interact. The chapter presented
an overview of such events that can be detected in video sequences with specific
references to working systems.
While specific events ease both the system as well as the user's input task, it is
interesting to note how the system reaction or feedback is interpreted by humans as
an important event in the interaction process. Such an event marks a specific inter-
action point which represents an agreement in communication. The way a system
reacts is deciphered and represented by the human operator at multiple levels includ-
ing affect, behavior and cognition which, in turn, influence the operator's response.
This has implications on the way feedback should be reported as well as on the
understanding of human-computer interaction by means of general human-human
communication.
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