Image Acquisition Control
108 Basler ace GigE
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 > Exposure Time Abs Parameter Setting + Total Readout Time
Exposure will overlap when:
Frame Period
≤ Exposure Time Abs Parameter Setting + Total Readout Time
You can determine the total readout time for a frame by reading the value of the Readout Time Abs
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 Abs 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 ReadoutTime = Camera.ReadoutTimeAbs.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 on page 27.
Overlapped frame acquisition cannot be performed when the camera is set for
global reset release rolling shutter mode. Overlapped frame acquisition can only
performed when the camera is in the electronic rolling shutter mode.
Frame Acquisition N
Frame Acquisition N+1
Frame Acquisition N+2
= Line Exposure
= Line Readout
Time
ExFSTrig
Signal
Fig. 55: Overlapped Exposure and Readout
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