Trigger Mode 15 ("Multi-Shot Trigger Mode") - Point Grey Flea3 FL3-U3 Technical Reference Manual

Point Grey Flea3 USB 3.0 Technical Reference
6.4.6.3

Trigger Mode 15 ("Multi-Shot Trigger Mode")

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 field of the TRIGGER_ MODE register 0x830
(page 90), which allows up to 255 images to be acquired from a single trigger. Writing a value of 0 to the parameter
field will result 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 register, 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 write to the TRIGGER_MODE register 0x830 will cause the current sequence to stop.
Related Knowledge Base Articles
Extended shutter mode operation for DCAM-compliant PGR Imaging Products
Revised 9/27/2012
Copyright ©2011-2012 Point Grey Research Inc.
Figure 6.4: Trigger Mode 1 ("Bulb Shutter Mode")
For FL3-U3-32S2 and FL3-U3-88S2 models operating in this trigger mode,
exposure is controlled by the global reset feature of the sensor. This feature may
reduce distortion artifacts typical of rolling shutter sensors. For more
information, see Rolling Shutter Artifacts on page
On FL3-U3-13Y3 a software trigger cannot be used for Trigger Mode 1.
During the capture of N images, the camera is still in an asynchronous trigger mode , rather than
continuous (free-running) mode. The result of this is that the FRAME_RATE register 0x83C will be
turned OFF, and the camera put into extended shutter mode. Users should therefore ensure that
the maximum shutter time is limited to 1/frame_rate to get the N images captured at the current
frame rate.
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Knowledge Base Article 166
6 Image Acquisition
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