Overlapping Exposure With Sensor Readout (All Models Except Aca2500-14Gm/Gc) - Basler ace acA640-90gm User Manual

Image Acquisition Control
7.8 Overlapping Exposure with Sensor
Readout
(All Models Except acA2500-14gm/gc)
The frame 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 frame
acquisition process, there are two common ways for the camera to operate: with "non-overlapped"
exposure and with "overlapped" exposure.
In the non-overlapped mode of operation, each time a frame is acquired the camera completes the
entire exposure/readout process before acquisition of the next frame is started. The exposure for a
new frame does not overlap the sensor readout for the previous frame. This situation is illustrated
in Figure 51 with the camera set for the trigger width exposure mode.
ExFSTrig
Signal
Frame Acquisition N
Exposure
Fig. 51: Non-overlapped Exposure and Readout
In the overlapped mode of operation, the exposure of a new frame begins while the camera is still
reading out the sensor data for the previously acquire frame. This situation is illustrated in Figure 52
with the camera set for the trigger width exposure mode.
104
Frame Acquisition N+1
Exposure
Readout
Frame Acquisition N+2
Readout
Exposure
Time
Readout
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