JVC SW-D8000U Instruction Manual page 63

SW-D8000U, 16CH. COLOR VIDEO MULTIPLEXER
detection sensitivity. To optimize performance, the SW-D8000U allows the programmer to choose
one of three levels of false alarm rejection separately for each camera as follows:
LOW If the sensitivity of the motion detection is adequate to detect the intended targets, and
there are few false alarms.
MEDIUM If there are frequent false alarms resulting from changes in light or similar apparent
movement over the whole camera scene. This can be caused by lights being turned on
and off, objects passing very close to the camera lens, camera vibration, or the sun
going behind clouds.
HIGH If there are frequent false alarms resulting from flashes of light on reflective surfaces, or
infrequent fast moving objects such as birds. Also changes in light as above should be
considered. If using the HIGH setting, check the recommendation for Lens Selection
below.
The factory default setting is LOW, for all cameras.
NOTE: It is important that the sensitivity and target size be set up before the false alarm rejection is
changed. It is also important that zones are not enabled for areas which have frequent
incidental movement, such as trees which may move in the wind, highly reflective surfaces
like windows or stretches of water, and traffic or pedestrians in the background.
Selecting the false alarm rejection level: It is recommended that the false alarm rejection setting is
left on LOW. Before changing the setting to MEDIUM or HIGH to reduce false alarms, first check
that the sensitivity, target size and zones are set up correctly. Do not select a higher false alarm
rejection level unless it is necessary.
Target Size:
(This setup is only used for intrusion detection.) The size of a target for motion detection (normally
a human being) will vary depending on the camera lens and the distance from the camera.
general, if size discrimination is used during the detection of motion, motion detection will result in
fewer false alarms from small animals, movement of plants in the wind or reflections.
SIZE' defines the minimum size.
The SW-D8000U target size setting is related to the number of zones that a single target will fill.
The programmer can set the TARGET SIZE separately for each camera, between 1 and 256. The
factory default target size setting is 1.
detection if the sensitivity is set up correctly.
Setting TARGET SIZE:
Estimate how many zones the target will normally fill based on the camera view, and then enter that
number as the target size.
Example:
If a human normally fills a 5 x 2 grid on a particular camera scene, which is 10 zones, then the target
size for that camera should be entered as 10.
Recommendation:
Set the target size to the lowest reasonable setting for the target and the camera scene, unless false
alarms from smaller targets are common. For more reliable intrusion detection, the target size
should preferably be set to at least 2.
Recommended LENS SELECTION for Intrusion Detection:
q Select a lens so that a human will always fill 2 or more zones in the camera scene.
q Select the lens and field of view so that the Target will normally remain in the field of view
for at least two seconds, at expected target speeds.
JVC PROFESSIONAL, IMAGING PRODUCTS
This means that all sizes of targets will result in motion
In
'TARGET
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