78
AirCleaner
•
User Guide
4. Operations
Control Panel Menu Item Descriptions
(The following parameter appears only when:
On Video Trigger = Defocus
)
This parameter has the following adjustable range:
•
= 0:00
Minimum value.
•
= 30:00
Maximum value (depending on memory installed, the
video format AirCleaner is currently programmed to
use, the value of the “Video Reaction Time”
parameters, and the value of the “Total PGM Delay”
parameter; maximum may be shorter than this).
The
Defocus Ramp
parameter is available in the Main Menu listing only when
the
On Video Trigger
parameter is set to
Defocus
, and determines the
amount of time it takes to transition from the live image to the completely defocused
image when the VIDEO Panic Button is pressed and held down.
When set to a value of
0:00
, the
Defocus Ramp
is essentially turned OFF; the
result is the transition from the live image to the fully defocused image occurs as a
“Cut” transition.
When set to any value other than
0:00
, the
Defocus Ramp
will cause
AirCleaner to gradually transition from the live image to the fully defocused image;
with a sufficiently long ramp time (for example, 1:00 or more), a camera rack focus
can be simulated when the VIDEO Panic Button is pressed and held down.
Refer to Figure 4-29 below. Notice the time it takes to ramp UP the defocus is
advanced relative to the VIDEO Panic Button trigger (
a
). Furthermore, if the screener
Video Reaction Time parameter is programmed, the ramp trigger is advanced ahead
of this reaction time (
b
). In other words, the trigger to start the ramp UP is advanced
by (Reaction Time) + (Ramp Time). This ensures the first frame of the violation is
completely defocused at the end of the defocus “ramp up” time.
Likewise, when the VIDEO Panic Button is released at the end of the violation (
c
),
the start of the ramp down will occur just after the button is released, to ensure the
entire visual violation is masked by the fully defocused image.
Figure 4-29. Defocus Ramp advance with a Single Screener
Defocus Ramp
= 0:15
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