Basler scout GigE, User Manual

Page: 165 / 374

AW00011916000 Image Acquisition Control
Basler scout GigE 155
For more detailed guidelines about using an external trigger signal with the trigger width exposure
mode and overlapped exposure, refer to the application notes called "Using a Specific External
Trigger Signal with Overlapped Exposure" (AW000565xx000). The application notes are available
in the downloads section of the Basler website: www.baslerweb.com.
9.10 Exposure Must Not Overlap Sensor
Readout
(scA750-60 Only)
The image 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.
On these cameras, exposure for a new acquisition must not begin until readout of the previously
acquired image is complete. This situation is illustrated in Figure 60.
Fig. 62: Non-overlapped Readout and Exposure
A result of this characteristic is that the exposure time setting on the camera will have a direct effect
on the camera’s maximum allowed frame rate. At longer exposure times, the maximum allowed
frame rate will be lower.
When you are operating a camera and using a hardware trigger to trigger image acquisition, you
could use the camera’s exposure time parameter settings and the timing formulas to calculate when
it is safe to begin each new acquisition. However, there is a more convenient way to know when it
safe to begin each acquisition. The camera supplies a “trigger ready” signal that is specifically
designed to let you trigger acquisitions safely and efficiently.
For more information about using the Trigger Ready signal with scA750-60 gm/gc cameras, see
Section 9.11.4 on
page 159
The information in this section only applies to scA750-60 gm/gc cameras. For
information about the other camera models, see Section 9.9 on
page 153 .
Image Acquisition N
Exposure Readout
Image Acquisition N+1
Exposure Readout
Image Acquisition N+2
Exposure Readout
Time