8.Features
© 2023 China Daheng Group, Inc. Beijing Image Vision Technology Branch 111
8.2.10.
Set Exposure
8.2.10.1.
Set Exposure Mode
Two Exposure Mode are available: Timed exposure mode and TriggerWidth exposure mode. Among them,
the TriggerWidth exposure mode determines the exposure time when the camera is configured for
hardware triggering. And the exposure time depends on the width of the trigger signal, which is triggered
by the rising edge (falling edge) set by the Trigger Activation.
1)
Timed exposure mode
Timed exposure mode is available on all camera models. In this mode, the exposure time is determined
by the camera's Exposure Time setting. If the camera is configured for software triggering, exposure starts
when the software trigger signal is received and continues until the exposure time has expired.
If the camera is configured for hardware trigger:
If rising edge triggering is enabled, exposure starts when the trigger signal rises and continues until
the exposure time has expired, as shown in Figure 8-26
Exposure
= Exposure Time
Hardware trigger signal
Figure 8-26 The sequence diagram in rising edge trigger of Timed exposure mode
If falling edge triggering is enabled, exposure starts when the trigger signal falls and continue until the
exposure time has expired, as shown in Figure 8-27
Exposure
= Exposure Time
Hardware trigger signal
Figure 8-27 The sequence diagram in falling edge trigger of Timed exposure mode
Avoid overtriggering in Timed exposure mode. If the Timed exposure mode is enabled, do not attempt to
send a new trigger signal while the previous exposure is still in progress. Otherwise, the trigger signal will
be ignored, and a FrameStartOvertrigger event will be generated.
2)
TriggerWidth exposure mode
In TriggerWidth exposure mode, the length of exposure is determined by the width of the hardware trigger
signal. This function can meet the needs of users to change the exposure time of each frame of image.
