Why Is My Camera Link Image Acquisition Slower Than Expected?
Primary Software: Driver Software>>NI-IMAQ
Primary Software Version: 2014
Primary Software Fixed Version: N/A
Secondary Software: Driver Software>>Vision Acquisition Software
I am using triggered acquisition with a Camera Link camera and an NI frame grabber. It seems to be working fine at low trigger rates. However when I increase the trigger rate past a certain point, the acquired frames per second drops to approximately half of the trigger rate. What is causing this?
This can be caused by triggering the camera and the frame grabber simultaneously.
Typically you will only need to trigger the camera or the frame grabber. Here are the two recommended ways of triggering your system:
The problem with triggering the camera and the frame grabber simultaneously is that the frame grabber cannot respond to new trigger pulses while it is receiving data or sending the image from the frame grabber to the computer's memory.
So, if a new trigger pulse is sent while the frame grabber is receiving data, the camera will expose a new image but the frame grabber will ignore the trigger. Since the frame grabber ignores the trigger, it also ignores the new image data that is being sent from the camera to the frame grabber. Therefore, it must wait until the next trigger is sent. This effectively makes the frame grabber miss every other image.
KnowledgeBase 2ARDFUOA: Line Scan Triggering Modes
Report Date: 10/31/2012
Last Updated: 01/12/2015
Document ID: 62UB6AM7