CCFC Field Camera
35
12.4.3 Motion Detect
Motion
Detect
is used to configure the camera to capture media using the
Motion
Detect
capability of the camera.
Even if this feature is enabled, motion detect only operates when the camera is
in the
Fully
On
power mode.
Figure 12-12 Motion Detect
The CCFC implements an adaptive motion detect scheme in order to help
avoid false motion detect triggers that can occur in normal outdoor scenes. The
adaptive motion detect method automatically adjusts the motion detect
threshold based on the average motion characteristics of a given scene.
The adaptive motion detect is a very good feature for most applications. The
adaptive motion detect scheme sets its threshold values based on a 20 second
moving average of the scene. For example, if a CCFC was focused on a ceiling
fan that was off, the CCFC motion detect would be triggered if the fan was
turned on. After a period of 20 seconds the motion detect would no longer be
triggered as the continuous motion of the fan would automatically increase the
required motion detect trigger level.
Another consideration with adaptive motion detect is that when a continuous
level of motion is introduced into a scene, the motion detect sensitivity
decreases. The result is that some motion may not be detected when a
continuous dynamic scene exists. For example, a person walking through a
scene with windblown trees may not trigger the motion detect capture that
would normally be triggered when there is no wind and the trees are not
moving.
The sensitivity level for motion detect is the only user configurable parameter
for
Motion Detect
operation. A value of 1 provides the least sensitive motion
detect threshold setting and a value of 99 provides the most sensitive motion
detect threshold setting. Motion detect can be a complicated feature to
implement. It is recommended to start off with a motion detect threshold
setting of 50 and experiment with the performance based on the application.
If the camera is not detecting motion that is desired, then the motion detect
sensitivity level should be increased. If the camera produces too many false
triggers, the motion detect level should be decreased. Note that there is always
a possibility that the camera can either produce false motion detects or not
