Genie Nano-
CXP Series™
Feature Descriptions
•
71
Using Cycling Presets
—
a Simple Example
As presented in this category’s overview, the cycling preset features allows setting up camera
configurations that can change dynamically and repeatedly, with minimum overhead. The features
that change along with the trigger for the feature change are preprogrammed in the camera.
Additionally, a set of preset features can be updated while the camera is acquiring with a different
preset. Such dynamic feature changes allow applications to perform tracking algorithms.
The following example describes a simple cycling sequence (using free running acquisitions) with
exposure change steps which will repeat until stopped by the user. This example uses the Sapera
tool CamExpert to set features and test the sequence.
Multi-Exposure Cycling Example Setup
•
For this example, first configure a free running acquisition of 20 fps with an exposure time
that’s somewh
at short (dark). These controls are in the Sensor Control Category group within
CamExpert.
•
Now select the Cycling Preset Category to setup and test the following example.
•
Set
cyclingPresetMode
to
Active
. This feature enables the Cycling Preset Module.
•
Set
cyclingPresetCount
to the number of presets which will be configured and used. For this
example set this to 4.
•
Set the feature
cyclingPresetIncrementalSource
to the event which will be used to increment
the cycling presets index. For this example, set this feature to
StartOfFrame
which is a logical
choice in a free-running acquisition setup.
•
Set the feature
cyclingPresetRepeater
to the number of incremental source events to count
before switching to the next preset. In this example we are counting
StartOfFrame
events, thus
a value of 20 (with a test setup of 20 fps) will switch presets every 1 second.
•
The feature
cyclingPresetResetSource
is optional for this example. This defines the event which
will reset the preset index back to 1. In this example, by setting the feature to
EndOfAcquisition
we know that when Freeze is clicked in CamExpert to stop the free-running acquisition, the
cycling preset index is returned to the start (1).
•
Set
PresetConfigurationSelector
to index 1.
•
Set
FeaturesActivationSelector
to
ExposureTime (the exposure initially set as somewhat dark).
•
Set
FeaturesActivationMode
to
Active
. This defines the camera exposure as one variable stored
in this preset index 1.
•
The feature
ExposureTime
shows the last exposure time used by the camera (when cycling was
not enabled). This field now controls the camera exposure time. The primary exposure time
field in the Sensor Control Category is in gray text indicating a read only field.
•
Set
PresetConfigurationSelector
to index 2.
•
Set the feature
ExposureTime
to a higher value, increasing the acquisition brightness.
•
Repeat for index 3 with an exposure a bit longer again, and index 4 with an even longer
exposure.
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