Experimental Physics and
Industrial Control System

Emmanuel Mayssat <[email protected]> · Wed, 10 Oct 2007 11:42:27 -0700

Hello all,

I tried frame grabber, etc. recently decided to move to an AXIS video
server. The asyn/epics driver is in development. We are reading the
mjpeg video stream (using the GPL code from axmjpeg). The throughput of
the video stream on the network can be throttled on the server side. We
use interrupt to trigger frame processing.

We completed performance testing. We can achieve the 30 frames per
second benchmark. I was shocked with the achieved performance. This
solution rocks! I gave myself a pat on the back just for thinking of it!
Load on cpu < 5%, load on local area network... negligible.

What takes time is the processing of each frame (background subtraction,
ROI, intensity monitor, etc.), so this part needs to be optimized. This
is actively being developed/reviewed.

--
Emmanuel

>         > Here at the CLS we're using linux-based soft IOCs to
>         > communicate with Flea and Flea2 cameras. 
>         > We're having difficulty in achieving video frame rates
>         > greater than about 10 Hz at 640x480 resolution. I'm
>         > interested to know how you are getting such fine performance
>         > (aside from using RTEMS :-) 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System