Overlapping Image Acquisitions; Overlapping Image Acquisitions For All Models Except Aca1920-25, Aca2500-14, Aca3800-14, Aca4600-10 - Basler acA2040-55 User Manual

AW00123409000
6.7

Overlapping Image Acquisitions

6.7.1 Overlapping Image Acquisitions for All Models
Except acA1920-25, acA2500-14, acA3800-14,
acA4600-10
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/sensor 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 66 with the camera set for the trigger width exposure mode.
ExFSTrig
Signal
Frame Acquisition N
Exposure Sensor Readout
Fig. 66: Non-overlapped Exposure and Sensor 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 acquired frame. This situation is illustrated in
Figure 67 with the camera set for the trigger width exposure mode.
Basler ace USB 3.0
Frame Acquisition N+1
Exposure Sensor Readout
Time
Image Acquisition Control
Frame Acquisition N+2
Exposure Sensor Readout
155