Point Grey Flea3 GigE Technical Reference
7 Image Acquisition
7.1.9
Multi-Shot Trigger (Mode 15)
Trigger Mode 15 is a vendor-unique trigger mode that allows the user to fire a single hardware or software trigger and
have the camera acquire and stream a predetermined number of images at the current frame rate.
The number of images to be acquired is determined by the parameter specified with the trigger mode. This allows up to
255 images to be acquired from a single trigger. Setting the parameter to 0 results in an infinite number of images to be
acquired, essentially allowing users to trigger the camera into a free-running mode.
Once the trigger is fired, the camera will acquire N images with an exposure time equal to the value defined by the
shutter, and stream the images to the host system at the current frame rate. Once this is complete, the camera can be
triggered again to repeat the sequence.
Any changes to the trigger control cause the current sequence to stop.
During the capture of N images, the camera is still in an asynchronous trigger mode (essentially Trigger
Mode 14), rather than continuous (free-running) mode. The result of this is that the frame rate is turned
OFF, and the camera put into extended shutter mode. Users should ensure that the maximum shutter
time is limited to 1/frame_rate to get the N images captured at the current frame rate.
Figure 7.8: Trigger Mode 15 (“Multi-Shot Trigger Mode”)
GenICam—
Acquisition Control
Acquisition Mode
MultiFrame
Acquisition Frame Count
Number of images to be acquired
Trigger Selector
Exposure Start
Trigger Mode
On
Trigger Source
Line
x
(GPIO pin)
Trigger Activation
Rising or Falling edge
Trigger Delay
0
Exposure Mode
Timed
Exposure Time
Integration Time
Exposure Auto
Off
Registers—
TRIGGER_MODE: 830h
Presence
[0]
1
ON
[6]
1
Polarity
[7]
Low/High
Source
[8-10]
GPIO Pin
Value
[11]
Low/High
Mode
[12-15]
Trigger_Mode_15
Parameter
[20-31]
N
number of images to be
acquired
Revised 10/29/2013
Copyright ©2010-2013 Point Grey Research Inc.
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