AW00118508000 Acquisition Control
Basler racer Camera Link 71
6.2 Overlapping Exposure with Sensor
Readout
The line acquisition process on the camera includes two distinct parts. The first part is the exposure
of the pixels in the imaging sensor. Once exposure is complete, the second part of the process –
readout of the pixel values from the sensor – takes place. In regard to this line acquisition process,
there are two common ways for the camera to operate: with “non-overlapped” exposure and with
“overlapped” exposure.
For the examples shown in this section the Trigger Activation line start trigger signal is assumed to
be set to RisingEdge.
In the non-overlapped mode of operation, each time a line is acquired the camera completes the
entire exposure/readout process before acquisition of the next line is started. The exposure for a
new line does not overlap the sensor readout for the previous line. This situation is illustrated in
Fig. 21 here an hardware line start trigger us used with the camera set for the trigger width exposure
mode.
In the overlapped mode of operation, the exposure of a new line begins while the camera is still
reading out the sensor data for the previously acquired line. This situation is illustrated in Fig. 22
with the camera set for the trigger width exposure mode.
Line Acquisition N
Exposure Readout
Line Acquisition N+1
Exposure Readout
Line Acquisition N+2
Exposure Readout
Time
ExLSTrig
Signal
Fig. 21: Non-overlapped Exposure and Readout
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