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6.2 Channel setup
Perspective
The sensor is detecting in addition to the object mode according to perspective pa-
rameters. Two rectangles appear on the edit area for defining the position of the fore-
ground and the background.
Important: The number for the object size in the foreground / background (example of
image: foreground 364, background 66) is only information to estimate the desired ob-
ject size. The definition of the object size is effected by the parameters Maxi-
mum/Minimum on the right hand of the edit:
Background: An object on the background position (Definition: center of the rectan-
gle) triggers only an alarm if the number of activated cells is in the range of object
minimum and object maximum (In the example between 19 and 165). The same range
is valid for objects that are farther away. For more information see object foreground.
The sensitivity is valid for all cells that are on the background position or farther.
People recognition: The meaning and possible parameters are described in Detail-
Setup (Area options and Expert).
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Foreground: An object at the fore position (Definition: The
centre of the fore rectangle) triggers only an alarm if the
number of activated cells is in the range of object minimum
and object maximum (In the example between 109 and
910). The same range is valid for objects that are positioned
nearer. The sensitivity is valid for all cells that are on the
foreground position or nearer.
Important note: For all object positions between fore- and
background the sensor calculates automatically the inter-
mediate values of maximum, minimum and sensitivity.
Standard: According to the object volume of the rectangle
the values of max. – and min. object volume will be set to
250 per cent and 29 per cent respectively.
Perspective: There are two kinds of perspective-definitions:
Horizontal: An object, that is moving at the same image col-
umn, appears smaller in the upper rows (background) than
in the lower rows (foreground). This is typical for camera
configurations outdoors.
Vertical: An object, moving at the same image row, appears
smaller (bigger) on the left side than on the right side, for in-
stance a camera perspective along a wall.
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