Flash Window Signal - Basler ace acA640-90gm User Manual

Image Acquisition Control

7.10.2 Flash Window Signal

Cameras with a rolling shutter imaging sensor (e.g., acA2500-14 models) can provide a flash
window output signal to aid you in the use of flash lighting. The flash window signal will go high when
the flash window for each image acquisition opens and will go low when the flash window closes.
Figure 59 illustrates the flash window signal on a camera with the shutter operating in the electronic
rolling shutter mode.
Flash
Window
Signal
Flash Window
Frame Acquisition N
Fig. 59: Flash Window Signal on Cameras with a Rolling Shutter
The flash window signal is also available on cameras with a global shutter imaging
sensor. On global shutter cameras, the flash window signal is simply the
equivalent of the exposure active signal.
For more information about the rolling shutter and the flash window, see Section 7.7.2 on
Selecting the Flash Window Signal as the Source Signal for the Output Line
The flash window output signal can be selected to act as the source signal for camera output line 1.
Selecting a source signal for the output line is a two step process:
Use the Line Selector to select output line 1.
Set the value of the Line Source Parameter to the flash window signal.
You can set the Line Selector and the Line Source parameter value from within your application
software by using the Basler pylon API. The following code snippet illustrates using the API to set
the selector and the parameter value:
Camera.LineSelector.SetValue( LineSelector_Out1 );
112
Flash Window
Frame Acquisition N+1
Time
Flash Window
Frame Acquisition N+2
= Line Exposure
= Line Readout
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