8.Features
© China Daheng Group, Inc. Beijing Image Vision Technology Branch 108
Acquisition
Mode
Actual mode
Continuous mode
Continuous acquisition
Trigger mode
Trigger acquisition
Continuous mode
Trigger
Continuous acquisition
1
2
3
4
frame1
frame2
frame3
frame4
frame5
frame6
frame7
Figure 8-12 Switch acquisition mode during reading out
As shown in
Figure 8-12, the camera starts with trigger mode
OFF
after receiving acquisition start
command.
At point 1, the camera gets a command of setting trigger mode
ON
while transferring the 3
rd
frame in trigger
mode OFF. The trigger mode is not active until the 3
rd
frame is finished, that is point 2, and then the trigger
signal is also allowed. At point 3, the camera gets a command of switching back to
OFF
. It is also not
active until the 5
th
frame is finished, it should wait a complete reading out. The camera actually switches
from trigger mode to continuous mode at point 4, and then the camera works in continuous mode.
Switch acquisition mode during blanking (or expositing)
Acquisition
Mode
Camera
output
Continuous mode
Continuous Frame
Trigger mode
Trigger Frame
Trigger
1
2
3
4
frame1
frame2
frame3
frame4
frame6
…
…
…
…
frame5
Continuous mode
Continuous Frame
Figure 8-13 Switch acquisition mode in waiting time
As shown in
Figure 8-13, the camera with trigger mode
OFF
begins after receiving an
AcquisitionStart
command.
At point 1, the camera gets a command of setting trigger mode
ON
while it is in wait state. The trigger
mode is not active until the 3
rd
frame is finished (including exposure and reading out), i.e., point 2. Please
note that the 3
th
frame does not belong to trigger mode. All trigger frames need trigger signals or software
trigger commands. At point 3, the camera gets a command of switching back to continuous mode. It is also
not active until the 5
th
frame is finished, it should wait a complete frame. The camera switches from trigger
mode to continuous mode at point 4 actually, and then the camera works in continuous mode.
