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Issue:
Measuring the time from trigger input to start of shutter (trigger latency).
Solution:
Many Point Grey cameras can be asynchronously triggered using an external trigger signal (see the Related Article 221 below for more information). The specific time from the external trigger edge to the start of shutter is listed in the camera's Technical Reference manual, but is typically less than 10us.
It is possible for users to measure this themselves by configuring one of the camera’s GPIO pins to output a strobe pulse (see the Related Article 179 below) and connecting an oscilloscope up to the input trigger pin and the output strobe pin. The camera will strobe each time an image acquisition is triggered; the start of the strobe pulse represents the start of exposure.
The timing latency of a software asynchronous trigger to start of shutter (integration) is discussed in Related Article 169.
Related
Articles:
1.) Time between software asynchronous trigger and start of integration.
2.) Synchronizing to an external signal using DCAM 1.31 Trigger_Mode_0.
3.) Setting a GPIO pin to output a signal using DCAM v1.31 strobe functionality.
Article
ID: |
255 |
| Published: |
1/11/2007 10:03:08 AM |
Last
Modified: |
1/11/2007 10:04:45 AM |
| Keywords: |
trigger, latency, trigger latency, timing, time, shutter, integration, relative |
Issue Type: |
Installation |
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