AW00123409000 Image Acquisition Control
Basler ace USB 3.0 159
Determining whether your camera is operating with overlapped or with non-overlapped acquisition
is not a matter of issuing a command or switching a setting on or off. Rather the way that you
operate the camera will determine whether the frame acquisitions are overlapped or not. If we
define the “frame period” as the time from the start of exposure for line one in the frame N
acquisition to the start of exposure for line one in frame N+1 acquisition, then:
Exposure will not overlap when:
Frame Period > ExposureTime Parameter Setting + Total Sensor Readout Time
Exposure will overlap when:
Frame Period ≤ ExposureTime Parameter Setting + Total Sensor Readout Time
You can determine the total sensor readout time for a frame by reading the value of the Sensor
Readout Time parameter. This parameter indicates the time in microseconds from the beginning of
readout for line one to the end of readout for line N (the last line). You can read the Readout Time
parameter value from within your application software by using the Basler pylon API. The following
code snippet illustrates using the API to get the parameter value:
double d = camera.SensorReadoutTime.GetValue();
You can also use the Basler pylon Viewer application to easily get the parameter value.
For more information about the pylon API and the pylon Viewer, see Section 3.1 on page 61.
Frame Acquisition N
Frame Acquisition N+1
Frame Acquisition N+2
= Line Exposure
= Line Readout
Time
ExFSTrig
Signal
Fig. 70: Overlapped Exposure and Sensor Readout
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