Abekas AirCleaner, Руководство пользователя

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58 AirCleaner • User Guide
4. Operations
Reaction Time
Two Screener Reaction Time Example
Following is an examples to illustrate the principles of the Reaction Time
parameter, when two screeners are operating AirCleaner.
The illustration below depicts the video input into AirCleaner in the top row of
squares, with each square representing one second of video. Within each second,
there can be up to 30 individual frames of video (depending on the video format).
The RIGHT edge of the top row of video in the illustration represents the first
frames of video fed into the input to AirCleaner, with the LEFT edge being the last
frames.
Likewise, the RIGHT edge of the two bottom rows of video represents the first
frames out of the “tap output” and program video output from AirCleaner, with the
LEFT edge being the last frames output.
Figure 4-19. Reaction Time with Two Screeners
In the illustration above, Screener 1 pushes the panic button at a point in the input
video stream that is six seconds after the violation had started (
a
). Even though
Screener 1 has a Reaction Time programmed for 3:00 seconds, this advance on the
trigger is not large enough to mask the start of the violation; three seconds at the
start of the violation are therefore not masked by Screener 1, which Screener 2 sees
on the
TAP OUT
screening monitor.
The panic button for Screener 2 is pressed just three seconds after the starting
fragment of the violation (
b
). However, since Screener 2 has an additional 5:00
second Reaction Time, the trigger is advanced by an additional five seconds.
At point (
c
), Screener 1 thought the violation was finished, and released the panic
button one second early; therefore, one more second of the violation makes it to the