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8.Features
© 2023 China Daheng Group, Inc. Beijing Image Vision Technology Branch 106
8.2.5.
Continuous Mode and Configuration
Continuous mode configuration
The default value of Trigger Mode is OFF in default user set. If the camera is opened with default user set,
the camera works in continuous mode directly. Otherwise, user can set Trigger Mode to OFF to work in
continuous mode.
Other parameters also can be changed in Trigger Mode OFF.
Continuous mode features
In continuous acquisition mode, the camera acquires and transmits images according to camera
parameter set.
In continuous mode, ROI size may have effects on frame rate.
8.2.6.
Acquisition Burst Mode
Acquisition burst mode setting is only applicable to trigger mode, and support three combinations:
1)
Acquisition mode: Continuous, Trigger type: FrameStart ON / FrameBurstStart ON
2)
Acquisition mode: Continuous, Trigger type: FrameStart ON / FrameBurstStart OFF
3)
Acquisition mode: Continuous, Trigger type: FrameStart OFF / FrameBurstStart ON
Trigger types support software trigger and hardware trigger.
When FrameStart OFF / FrameBurstStart OFF, the maximum frame rate output by the camera is limited
by the physical bandwidth of the USB 3.0 interface, so camera is under standard mode. In this mode, the
frame rate is lower or equal to the current transmission capacity (influenced by the current exposure time,
image size and other factors).
When the combination of trigger modes is any of the above three, the maximum frame rate output by the
camera is not limited by the physical bandwidth of the USB 3.0 interface, and acquisition is conducted
according to the maximum acquisition capacity of the sensor, and the frame rate is generally greater than
the current transmission capacity (depends on sensor rate). Because of the acquisition bandwidth is
greater than the transmission bandwidth, frame dropping may occur due to insufficient buffer.
When the acquisition burst mode enabled, due to the bandwidth difference of the sensor and the
performance difference of the host computer, frame dropping may occur during long operation. To
avoid this situation, the frame rate control switch should be enabled to limit the acquisition frame
rate. The following table lists the cameras that support acquisition burst mode and the frames in
various acquisition modes.
Related Parameters
Continuous mode maximum frame rate: The maximum frame rate of camera when trigger mode and
device bandwidth limit is OFF. Default full frame and short exposure time, and camera is limited by
interface bandwidth at this time.