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how to calculate the number of frames missed when using HL/LL grab functions?

Dear Guru:
 
I'm using PCI-e1430 and Atmel linescan CCD SM2 CL 2014
I have a question to consult:
 
In our experiment, we want to grab and process images continuously. We write the code in C++.
Our plan is imgGrab(), then process() , then loop.  The CCD is running in free-run mode.
The imgGrab function is used to aquires the most current frame into the  buffer. And the time of
processing one frame is so long.  I wanna  know how to calculate the number of frames missed
precisely between two consecutive imgGrab?
 
Appreciate  for any help!
 
 
 
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Hi Witchball,

I think you could calculate it based on elapsed time.

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