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Calculating the required focal length
To calculate the required focal length, measure the distance from the smart camera
to the object, as well as the height (vertical size) and width (horizontal size) of the
object.
Matrox Iris GT
Use the following calculations to determine the required focal length for your
situation.
×
Vertical constant
Distance from object
--------------------------------------------------------------------------------------------------- -
Vertical size of object
+
Vertical constant
By selecting the smallest focal length from the vertical and the horizontal focal
length calculations, you assure that both the vertical and horizontal dimensions
of your object fit within the view of your lens.
The sensor chip type of your smart camera determines the horizontal and vertical
constants required in the above-mentioned calculations. Each type of Matrox
Iris GT smart camera uses a different sensor chip type.
Product name
GT300
GT1200
GT1900
Calculating the required focal length
Distance from object
Horizontal constant
and
----------------------------------------------------------------------------------------------------------------
Horizontal size of object
Sensor chip type
Horizontal constant
1/3"
4.8 mm
1/3"
4.8 mm
1/1.8"
7.1 mm
105
×
Distance from object
+
Horizontal constant
Vertical constant
3.6 mm
3.6 mm
5.3 mm
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