ACTi I51 User Manual download pdf (Page 67)

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Firmware User’s Manual V6.08.30

Enabled or disabled

Although all 3 motion detection regions are enabled by default,

each can be disabled and enabled individually. Look at the example:

Only the region 1 is enabled while 2 and 3 are disabled. The

disabled regions disappear from the video display.

Note that the number of the motion detection region is written in

the upper left corner of the region.

Location of the region

You can move the motion detection region anywhere on the field of

view by dragging the top of the motion detection rectangle as

shown on the image. The motion detection regions may even be

overlapping if you like.

Size of the region

By dragging the lower right corner of the motion detection region

you can change the size of the region. The maximum size of the

region can even be as big as the whole screen.

Sensitivity

Sensitivity is the parameter that helps us distinguish actual moving targets (people, vehicles)

from the slightly moving background, such as leaves of the trees waving in the wind. In order to

avoid false alarms, we might want the camera be able to ignore small motion. The higher is the

sensitivity level of the camera the smaller shift of the object is needed to trigger the alarm. For

example, if the object within motion detection region has moved for about 1-3 pixels during two

video frames, then such small motion will be discarded by camera if the sensitivity is low, and will

still trigger an alarm if the sensitivity is high. In other words, you can think of sensitivity level as a

reversed speed limit – the smaller is the sensitivity, the faster are the objects allowed to move

without being detected.

The biggest challenge of motion detection configuration is to find the settings that do not produce

false alarms and at the same time do not miss any actual intrusions. The rule of thumb is: the

sensitivity should be as high as possible while not producing false alarms. The default

sensitivity level of the cameras is 70 (on a scale of 0-100) and it is a good setting for most

standard cases.

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ACTi I51 User Manual Page 67