Sensor Selection
Pressing the sensor selection button would allow the user to access the settings for the respective sensor.
The button press will toggle between Sensor 1 and Sensor 2.
Minimum Contrast Gauge
The minimum contrast that is required to detect an edge can be set using this contrast gauge and the
corresponding numerical integer value is displayed to the right of the gauge. When the contrast value is
lowered the controller becomes sensitive to small contrast changes in the image captured by the sensor.
Hence more and more edges with low contrast will be picked by the controller. When the contrast value is
set high, the edges with high contrast values will be seen while the low contrast edges would be
disregarded.
The recommended minimum contrast value for edge mode is 10 and for contrast mode is 50.
NOTE:
Set the minimum contrast as high as possible while the feature of interest is still visible. This will
increase the robustness of the algorithm.
NOTE:
When the thresholding method is static then the minimum contrast value directly corresponds to a
scaled static threshold.
NOTE:
Under certain conditions the user will not be permitted to change the minimum contrast value. This
will occur in contrast mode when the controller is taught to track a certain feature on the web.
WARNING:
If the sensing mode is contrast and if the minimum contrast value is too low or zero then the
contrast detection algorithm will not function properly and would perceive every small change in the
image. For contrast mode the recommended default value is 50.
WARNING:
If the sensing mode is edge and if the minimum contrast value is too low or zero then the edge
detection algorithm may pick only one edge even if multiple edges are present. For edge mode the
recommended default value is 10.
Brightness Gauge
When the brightness control is set to be in freeze mode, the gauge can be used to manually set the
brightness. The corresponding numerical integer value is shown on the right of the gauge. The brightness can
be changed from 0% to 100%.
NOTE:
This feature is intended for advanced users and by default the brightness control should be allowed
to change automatically.
Brightness Control
The controller has an automatic brightness control algorithm that will change the brightness of the LEDs in
the sensor based on the captured image. The algorithm helps to capture the best possible image based on
certain criteria. The algorithm also helps with background suppression. The user can disable the automatic
Content subject to change without notice
SCU5: Sensor and Web Guide Controller User Manual v 3.6| Page 27
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