8.Features
© 2023 China Daheng Group, Inc. Beijing Image Vision Technology Branch 73
Avoid overtriggering in TriggerWidth exposure mode. If the TriggerWidth exposure mode is enabled, do
not send trigger signals at too high a rate. Otherwise, trigger signals will be ignored, and a
FrameStartOvertrigger event will be generated.
The trigger signal width of the hardware triggering should not be shorter than the value of the
entered ExposureOverlapTimeMax parameter.
2)
Prerequisites
If TriggerWidth exposure mode is enabled:
a)
Set the TriggerMode parameter to On.
b)
Set the TriggerSource parameter to one of the available hardware trigger sources, e.g., Line0.
c)
Set the ExposureMode parameter to TriggerWidth (if available).
8.2.11.2.
Set Sensor Exposure Mode
Global Shutter
The implementation process of global shutter is as shown in Figure 8-27, all the lines of the sensor are
exposed at the same time, and then the sensor will read out the image date one by one.
The advantage of the global shutter is that all the lines are exposed at the same time, and the images do
not appear offset and distortion when capturing moving objects.
The time width of the flash signal can be got by the following formula:
T
strobe
=T
exposure
Exposure time
Readout time
All lines are exposing at the same time
All lines transfer electrons from
exposure area to storage area
Reading electrons from
storage area line by line
Time
Figure 8-27 Global Shutter
